JP2016178808A - Charge/discharge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge/discharge system that prevents operation of an electric vehicle power conditioner from stopping immediately after starting supply of AC power.SOLUTION: There are provided: an EV power conditioner that is connected to a system power supply and a photovoltaic power generation system, and supplies AC power to an electric vehicle or converts DC voltage supplied from the electric vehicle to AC power; and a PV power conditioner 12 that converts DC power generated using natural energy to AC power to output the AC power. The PV power conditioner 12 includes: a zero-cross detection circuit 12c for detecting a zero-cross point of AC voltage from an inverter 12b; a voltage variation width detection circuit 12d for detecting a variation width of AC voltage in the vicinity of the zero-cross point; and a control circuit 250 for controlling operation of the inverter 12b on the basis of whether or not the variation width exceeds a setting value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a charge / discharge system that charges a storage battery of an electric vehicle with a commercial power source or a natural energy power generation system for home use or supplies electric power from a storage battery of the electric vehicle to a home appliance load.

  2. Description of the Related Art Conventionally, a charge / discharge system that supplies electric power from a storage battery of an electric vehicle to a home appliance load or charges a storage battery of an electric vehicle from a household commercial power supply is known (see Patent Document 1).

  When charging / discharging the storage battery of an electric vehicle from a commercial power source, the charging / discharging system performs charging by converting AC power into DC power by an electric vehicle power conditioner provided as a residential facility. Conversely, when power is supplied from the storage battery of the electric vehicle to the home appliance load, the DC power output from the storage battery of the electric vehicle is converted into AC power by the power conditioner for the electric vehicle and supplied to the home appliance load.

  On the other hand, it is considered to apply the solar power generation system described in Patent Literature 2 to Patent Literature 4 to Patent Literature 1 to charge a storage battery of an electric vehicle with electric power generated by the solar power generation system.

  However, since the solar power generation system generates power in conjunction with the system power supply, there is a problem that the operation stops due to the fact that it cannot be linked in the event of a power failure.

  As a solution to this problem, there is a power supply system described in Patent Documents 5 and 6.

JP 2013-102608 A JP2013-13174A WO2013 / 118376 JP 2006-311707 A JP 2011-188607 A JP 2013-165777 A

  By the way, in the charging / discharging system shown in Patent Document 1, when power is supplied to the home appliance load by the output of the electric vehicle power conditioner, the voltage waveform of the alternating voltage of the vehicle power conditioner is immediately after the start of supply. It changes rapidly near the zero cross. This sudden change causes a peak current to flow instantaneously, and it is determined that the peak current is an overload, and the operation of the charge / discharge power conditioner, which is an electric vehicle power conditioner, is stopped. It was. Even if the power supply systems of Patent Documents 5 and 6 are applied to the charge / discharge system of Patent Document 1, the same problem occurs.

  An object of the present invention is to provide a charge / discharge system in which the operation of the charge / discharge power conditioner does not stop due to an instantaneous peak current.

According to the first aspect of the present invention, AC power supplied from a distribution board connected to a system power source and a natural energy power generation system is supplied to a storage battery of an electric vehicle, or DC power output from the storage battery is converted to AC power. A charge / discharge power conditioner that converts and supplies the power to the distribution board is provided, and the natural energy power generation system converts DC power generated by the natural energy into AC power synchronized with the AC voltage of the system power supply. The power conditioner for power generation to be output to the distribution board, and in the event of a power failure, the power conditioner for charge / discharge causes a pseudo AC voltage to be output from the DC / AC converter for discharge, and the power conditioner for power generation A charge / discharge system that outputs AC power synchronized with the pseudo AC voltage,
A zero-cross detection circuit for detecting a zero-cross point of the AC voltage output from the power conditioner for power generation;
A voltage fluctuation width detection circuit for detecting a fluctuation width of the AC voltage near the zero cross point detected by the zero cross detection circuit;
A first control means for controlling a discharge operation of the charge / discharge power conditioner based on whether or not a fluctuation width detected by the voltage fluctuation width detection circuit exceeds a preset value; and the pseudo AC voltage Strain detection means for detecting the distortion voltage of
And a second control means for controlling the discharge DC / AC converter so that the distortion voltage is reduced based on the distortion voltage detected by the distortion detection means.

  According to the present invention, even if an instantaneous peak current occurs near the zero cross of the AC voltage, the operation of the charge / discharge power conditioner does not stop.

It is explanatory drawing which showed schematically the structure of the charging / discharging system which concerns on this invention. It is the block diagram which showed the structure of PV power conditioner of the charging / discharging system shown in FIG. It is the block diagram which showed the structure of the power conditioner apparatus for electric vehicles of the charging / discharging system shown in FIG. It is a block diagram which shows the detailed structure of the power conditioner apparatus for electric vehicles shown in FIG. It is explanatory drawing which showed the alternating voltage waveform in the power conditioner apparatus for electric vehicles of FIG. FIG. 3 is an explanatory diagram showing an output voltage waveform and a reference waveform of the inverter shown in FIG. 2. It is explanatory drawing which showed the example in the case of charging an electric vehicle from the waterproof grounding outlet shown in FIG. It is explanatory drawing which showed the example in the case of charging two electric vehicles simultaneously. It is the block diagram which showed the structure of the power conditioner apparatus for electric vehicles of 2nd Example. It is a block diagram which shows the detailed structure of the power conditioner apparatus for electric vehicles shown in FIG. It is explanatory drawing which showed the alternating voltage waveform in the power conditioner apparatus for electric vehicles of FIG. It is the block diagram which showed the structure of the power conditioner apparatus for electric vehicles of 3rd Example. It is the block diagram which showed the structure of the power conditioner apparatus for electric vehicles of 4th Example.

  Hereinafter, an embodiment which is an embodiment of a charge / discharge system according to the present invention will be described with reference to the drawings.

<< First Example >>
A charge / discharge system S1 shown in FIG. 1 includes a solar power generation system (natural energy power generation system) 10, first and second distribution boards (indoor distribution boards) 20, 30, and a power measurement device (measurement device) 60. And an information collecting device 100 and a stationary type electric vehicle power conditioner device 120 provided outdoors.

  The solar power generation system 10 is a system that is disposed in a building H such as a detached house and supplies generated power to a load (home appliance load).

  First, this building H will be described. This building H is connected to a system power network (system power source) E as a power network for receiving power supply from the system power.

  The system power supply E and the electric wire 20a wired to the building H are connected via the first and second electric energy meters M1 and M2, and the electric wire 20a is connected to a main trunk (not shown) of the first distribution board 20. The main trunk of the first distribution board 20 is connected to the main trunk (not shown) of the second distribution board 30.

  The first power meter M1 measures the amount of power flowing from the system power source E to the building H, and the second power meter M2 measures the amount of power flowing from the building H to the system power source E. That is, the first power meter M1 integrates the purchased power amount, and the second power meter M2 integrates the sold power amount.

  In the second distribution board 30, a current sensor (not shown) for detecting a current flowing through the main trunk is provided. A power measurement device 60 is installed in the vicinity of the second distribution board 30.

  In addition, a plurality of branch trunks 31 are connected to the main trunk of the second distribution board 30, and each of the plurality of branch trunks 31 is connected to an outlet (not shown) provided in a room of the building H with a feed line (see FIG. (Not shown).

  The solar power generation system 10 includes a solar power generation device (power generation means) 11 as a distributed power generation device, and a PV power conditioner (power conditioner for power generation) 12, and the solar power generation device 11 and the PV The power conditioner 12 is provided outdoors.

  This solar power generation device 11 is a device that generates power by directly converting solar energy, which is natural energy, into electric power.

  The PV power conditioner 12 converts the DC power generated by the photovoltaic power generator 11 into AC power and outputs the AC power. The PV power conditioner 12 is synchronized with the AC voltage of the system power supply E and has a phase shift with respect to the AC voltage. An AC voltage is output so as not to occur. Note that the AC voltage of the system power supply E is detected by a voltage detection sensor (not shown) provided on the main trunk of the second distribution board 30.

  In the event of a power failure, an AC voltage from the system power supply E cannot be obtained, so a pseudo AC voltage is generated from the power conditioner device 120 for an electric vehicle, and AC power is output from the PV power conditioner 12 based on this pseudo AC voltage. It is supposed to let you.

  Further, the PV power conditioner 12 is connected to the main line (not shown) of the second distribution board 30 by the power supply line 18, and the AC power of the PV power conditioner 12 is supplied from the main line to the branch trunk 31 and the power supply. It is supplied to a home appliance load connected to the outlet via an electric wire (not shown). At this time, AC power is not output to the emergency outlet 13.

  The PV power conditioner 12 is an emergency outlet when a pseudo AC voltage is not output from the electric vehicle power conditioner device 120 during a power failure, that is, when the electric vehicle C is not connected to the electric vehicle power conditioner device 120. AC power is output only to 13 and AC power is not supplied to the second distribution board 30.

  A waterproof grounding outlet (charging outlet) 121 is provided on the outer wall Ha of the building H in the vicinity of the power conditioner device 120 for the electric vehicle. The waterproof grounding outlet 121 is connected to the second distribution board by the feeder line 32. Connected to 30. AC power output from the PV power conditioner 12 and AC power from the system power supply E are supplied to the waterproof grounding outlet 121 through the feeder line 32.

  The electric vehicle power conditioner device 120 and the first distribution board 20 are connected by power supply lines 125 and 126, and the AC power of the system power supply E is supplied to the electric vehicle power conditioner device 120 via the power supply line 125. It has come to be. In addition, the electric vehicle power conditioner device 120 and the second distribution board 30 are connected by a feeder 127, and the AC power output from the PV power conditioner 12 is supplied to the electric vehicle power conditioner device 120. Be able to.

  The electric vehicle power conditioner device 120 and the waterproof grounding outlet 121 are arranged so as to face the parking space U.

  The power conditioner device 120 for an electric vehicle inputs the AC power of the system power source E through the first distribution board 20 during normal time (normal time), and directly passes through the first distribution board 20 through the feeder line 126. Further, the output is made to the second distribution board 30. At the time of a power failure, when the electric vehicle C is connected to the power conditioner device 120 for the electric vehicle, the DC power of the storage battery (not shown) of the electric vehicle C is converted into AC power, and the The power is supplied to the one distribution board 20.

  The electric vehicle power conditioner device 120 converts AC power from the system power supply E or the PV power conditioner 12 into predetermined DC power and supplies it to the electric vehicle C in the charging mode. At this time, DC power of a storage battery (not shown) of the electric vehicle C is converted into AC power and supplied to the first distribution board 20 via the feeder line 126.

  The remote control 102 is for setting the charging mode, discharging mode, and other modes of the electric vehicle power conditioner device 120.

  The power measuring device 60 measures the amount of power output from the solar power generation system 10 based on a detection signal detected by a current detection sensor (not shown), and wirelessly transmits the measured measurement data to the information collecting device 100. .

  The information collection device 100 displays the current power generated by the photovoltaic power generation system 10 based on the transmitted measurement data, the accumulated power amount, and the like on a display device (not shown).

The information collecting apparatus 100 is connected to an external communication network such as the Internet via the router 101, and can transmit and receive data such as measurement values to and from an external server (not shown). It can be done.
[PV power conditioner]
As shown in FIG. 2, the PV power conditioner 12 includes a DC / DC converter 12a, an inverter 12b, a zero cross detection circuit 12c, a voltage fluctuation detection circuit 12d, and a control circuit (first control means) 250 that controls the inverter 12b. have.

  The DC / DC converter 12a boosts the voltage of the DC power from the solar power generation device (DC power generation device) 11, and outputs the boosted DC power. The inverter 12b outputs the DC voltage of the DC power output from the DC / DC converter 12a as the AC voltage having the same frequency and the same frequency as the commercial voltage.

  The power supply line 18 and the emergency outlet 13 are connected to the output side of the inverter 12 b, and the power supply line 18 is connected to the second distribution board 30.

The control circuit 250 controls the inverter 12b so that the AC voltage output from the inverter 12b is synchronized with the AC voltage of the system power supply E and does not cause a phase shift. The inverter 12b is controlled to synchronize with the pseudo AC voltage output from the NA device 120.
[Power conditioner equipment for electric vehicles]
As shown in FIG. 3, the electric vehicle power conditioner device 120 includes an EV power conditioner (charging / discharging power conditioner) 122 and distortion detection that detects distortion of the AC voltage output from the EV power conditioner 122. A circuit (distortion detection means) 300 and a control circuit (second control means) 310 for controlling the EV power conditioner 122 are provided.

  As shown in FIG. 4, the EV power conditioner 122 includes changeover switches SW1 and SW2, a charging AC / DC converter 123 that converts an AC voltage into a DC voltage and charges a storage battery of the electric vehicle C, A discharge DC / AC converter 124 that converts the DC power of the storage battery of the automobile C to AC power and outputs the AC power.

  The changeover switch SW1 is switched to the terminal S1a in the system power supply mode, and is switched to the terminal S1b in the solar power generation mode.

  The changeover switch SW2 is normally turned on, and the AC power of the system power supply E is supplied to the second distribution board 30 via the first distribution board 20, the feeder line 125, and the changeover switch SW2. At the time of a power failure, the changeover switch SW2 is turned off.

  The distortion detection circuit 300 includes a voltage waveform detection circuit 301 that detects the voltage waveform of the AC voltage output from the discharge DC / AC converter 124 and a reference waveform of a sine wave that is a reference synchronized with the AC voltage of the system power supply E. A reference waveform generation circuit 302 to be generated; and a comparison circuit 303 that compares the reference waveform generated by the reference waveform generation circuit 302 with the detected voltage waveform detected by the voltage waveform detection circuit 301 and detects a difference between them. Yes.

  The reference waveform generation circuit 302 generates a sine wave reference waveform having the same frequency as that of the system power supply E in the event of a power failure.

  The control circuit 310 controls the discharge DC / AC converter 124 of the EV power conditioner 122 based on whether or not the distortion voltage detected by the distortion detection circuit 300 exceeds a threshold value Vk that is a set voltage. This control controls the pulse width of a pulse signal that turns on a switching element (not shown) constituting the DC / AC converter 124 so that the distortion is eliminated. The threshold value Vk can be arbitrarily changed.

  In addition, the control circuit 310 controls the discharging DC / AC converter 124 to output the pseudo AC voltage to the first distribution board 20 in order to operate the PV power conditioner 12 at the time of a power failure.

  The control circuit 310 controls switching of the changeover switch SW1 and on / off of the changeover switch SW2.

The electric vehicle power conditioner device 120 is provided with a power supply circuit (not shown). The power supply circuit obtains a DC power supply voltage from the AC voltage of the system power supply E and operates the control circuit 310 and the like. However, at the time of a power failure, the power supply voltage is obtained from the DC voltage of the storage battery of the electric vehicle C. In addition, it does not operate when the electric vehicle C is not connected during a power failure.
[Operation]
Next, operation | movement of charging / discharging system S1 comprised as mentioned above is demonstrated.

When charging a storage battery (not shown) of the electric vehicle C, first, the power conditioner device 120 for the electric vehicle and the electric vehicle C are connected by the power supply cord 130 as shown in FIG. Next, the power conditioner device 120 for an electric vehicle is set to a charging mode. The charging mode is set by operating the remote control 102 or a mode switch (not shown) provided in the electric vehicle power conditioner device 120.
[Solar power generation mode]
When the storage battery of the electric vehicle C is charged with the AC power output from the PV power conditioner 12, the solar power generation mode is set by operating the mode switch of the remote control 102 or the power conditioner device 120 for the electric vehicle.

  With the setting of the solar power generation mode, the DC / DC converter 12a of the PV power conditioner 12 shown in FIG. 2 boosts the DC power generated by the solar power generation device (DC power generation device) 11 and inputs it to the inverter 12b. . The inverter 12b converts the input DC power into AC power having a constant frequency (50 Hz or 60 Hz) with a constant voltage of 100 V and outputs the AC power. At this time, the control circuit 250 controls the inverter 12b so as to be synchronized with an AC voltage applied to a main trunk (not shown) of the second distribution board 30 and not to cause a phase shift. AC power synchronized with the AC voltage is output from the inverter 12b.

  The AC power output from the inverter 12b is input to the zero cross detection circuit 12c. The zero cross detection circuit 12c detects the zero cross point of the AC voltage output from the inverter 12b.

  Now, for example, as shown in FIG. 5, the voltage may suddenly change in the vicinity of the zero cross point of the AC voltage Ve output from the inverter 12b, and when the zero cross detection circuit 12c detects the zero cross point at time t1, The voltage fluctuation width detection circuit 12d obtains the voltage difference between the negative peak voltage P1 and the positive peak voltage P2 of the rapid voltage change within a predetermined time from the time point t1, that is, the voltage fluctuation width Vw.

  Then, the control circuit 250 determines whether or not the voltage fluctuation width Vw obtained by the voltage fluctuation width detection circuit 12d is equal to or larger than the set value Vk. When the voltage fluctuation width Vw is equal to or larger than the set value Vk, the control circuit 250 Stop operation.

  In addition, the AC power output from the inverter 12b is supplied to the main trunk of the second distribution board 30 and further supplied to the home appliance load via the branch trunks 31 of the second distribution board 30. In addition, this AC power is supplied from the second distribution board 30 to the power conditioner device 120 for the electric vehicle via the feeder line 127.

On the other hand, the changeover switch SW1 is switched to the terminal S1b according to the setting of the charging mode, and the AC power output from the PV power conditioner 12 is supplied to the power conditioner device for the electric vehicle via the second distribution board 30 and the feeder line 127. 120. The electric power supplied to the electric vehicle power conditioner device 120 is supplied to the charging AC / DC converter 123 of the EV power conditioner 122. The charging AC / DC converter 123 converts the supplied AC power into DC power and charges a storage battery (not shown) of the electric vehicle C.
[Charging mode and grid power mode]
In the electric vehicle power conditioner device 120, when the charging mode is set and the system power supply mode is set, the changeover switch SW1 is switched to the terminal S1a, and the system is connected from the first distribution board 20 via the feeder line 125. AC power from the power source E is input to the EV power conditioner 122. The charging AC / DC converter 123 of the EV power conditioner 122 charges the storage battery (not shown) of the electric vehicle C by converting the AC power of the system power source E into DC power.
[Power outage]
In the event of a power failure, the AC voltage is not input to the power conditioner device 120 for the electric vehicle. Therefore, the control circuit 310 determines that a power failure has occurred and turns off the changeover switch SW2 and operates the discharge DC / AC converter 124. To generate a pseudo AC voltage. This pseudo AC voltage is supplied to the second distribution board 30 via the feeder 126 and the first distribution board 20. In addition, the second distribution board 20 is disconnected from the system power supply E by a switch (not shown).

  In the PV power conditioner 12, an AC voltage is not input to the second distribution board 30 from the system power supply E due to a power failure, but a pseudo AC voltage is input to the second distribution board 30, so based on this pseudo AC voltage The DC power generated by the solar power generator 11 is converted into AC power and output. That is, the PV power conditioner 12 outputs an AC voltage in synchronization with the pseudo AC voltage applied to the second distribution board 30 so that no phase shift occurs with respect to the pseudo AC voltage.

That is, the PV power conditioner 12 continues to operate while the pseudo AC voltage is continuously input to the second distribution board 30 via the first distribution board 20, and the DC power generated by the solar power generation device 11. Will be converted into AC power and will continue to be supplied to consumer electronics loads.
[Charge mode during power failure]
When the charging mode is set at the time of a power failure, the AC power output from the PV power conditioner 12 is supplied from the second distribution board 30 through the feeder 127 and the changeover switch SW1 (switched to the terminal S1b). Input to charging AC / DC converter 123. In addition, the control circuit 310 operates the charging AC / DC converter 123 to convert the AC power into DC power and charge the storage battery of the electric vehicle C. That is, the storage battery of the electric vehicle C is charged with the electric power generated by the solar power generation device 11.

  At the time of a power failure, the discharge DC / AC converter 124 outputs a pseudo alternating voltage as described above, and the voltage waveform detection circuit 301 shown in FIG. 3 is an alternating current of the alternating voltage output from the discharge DC / AC converter 124. Detect voltage waveforms. On the other hand, an alternating voltage is input from the grid power network E to the reference waveform generation circuit 302.

  The comparison circuit 303 compares the AC voltage waveform detected by the voltage waveform detection circuit 301 with the reference waveform input to the reference waveform generation circuit 302 from the system power supply E. For example, as shown in FIG. 6, when the AC voltage waveform detected by the voltage waveform detection circuit 301 is Vha and the reference waveform input to the reference waveform generation circuit 302 is Vf, the reference waveform Vf and the AC voltage waveform Vha are The maximum voltage difference Vs that maximizes the difference is detected as a distortion voltage.

  The control circuit 310 detects an increase / decrease change in the difference between the reference waveform Vf and the AC voltage waveform Vha, and the discharge DC / AC converter 124 so that the maximum voltage difference Vs does not exceed a preset set voltage (threshold). To control the output voltage.

As a result, the AC voltage of the AC power output from the discharge DC / AC converter 124 is not distorted to exceed the maximum voltage difference Vs. For this reason, it can prevent charging the storage battery of the electric vehicle C with the voltage more than a rated voltage. Further, since the distortion of the AC voltage output from the discharge DC / AC converter 124 is suppressed, the operation of the EV power conditioner 122 is not stopped, and the electric power generated by the photovoltaic power generator 11 Can be used effectively.
[Discharge mode at power failure]
When the discharge mode is set at the time of a power failure, the control circuit 310 operates the discharge DC / AC converter 124 to convert the DC power of the storage battery of the electric vehicle C into AC power. The power is supplied to the second distribution board 30 via the distribution board 20 and supplied to the home appliance load. That is, the EV power conditioner 122 is operated independently.
[Normal discharge mode]
When the discharge mode is normally set, the control circuit 310 controls the discharge DC / AC converter 124 of the EV power conditioner 122 in synchronization with, or linked to, the AC voltage of the system power supply E, so that the storage battery of the electric vehicle C Is converted to an AC voltage. That is, the DC power output from the storage battery is converted into AC power and supplied to the first distribution board 20 via the feeder line 126.

The AC power supplied to the first distribution board 20 is supplied to the home appliance load via the second distribution board 30 and the plurality of branch trunks 31.
[Charging electric vehicles]
When the power conditioner device 120 for an electric vehicle cannot be used due to maintenance or the like, the storage battery of the electric vehicle C can be charged by connecting the waterproof grounding outlet 121 and the electric vehicle C with a power supply cord 130 as shown in FIG. Can do.

  Further, as shown in FIG. 8, if the power conditioner device 120 for an electric vehicle and the electric vehicle C1 are connected by a power supply cord 130, and the waterproof grounding outlet 121 and the electric vehicle C2 are connected by a power supply cord 130, the system power supply The two electric vehicles C1 and C2 can be charged simultaneously by the AC power of E or the AC power output from the PV power conditioner 12.

  As shown in FIG. 8, with the electric vehicles C1 and C2 connected, the electric vehicle power conditioner device 120 converts the direct current voltage output from the storage battery of the electric vehicle C1 into a predetermined alternating current voltage. Electric power is supplied to the first distribution board 20, and further, this AC power is supplied to the electric vehicle C2 via the second distribution board 30, the power supply line 32, the waterproof grounding outlet 121, and the power supply cord 130. The car C2 can be charged.

  In this way, the storage battery of the electric vehicle C2 can be charged from the storage battery of the electric vehicle C1, and the electric vehicle C2 is charged by the AC power of the system power supply E or the AC power of the PV power conditioner 12, for example, at the time of a power failure at night. Even if this is not possible, the electric vehicle C1 can be charged to the electric vehicle C2.

  For example, when both the electric vehicles C1 and C2 have insufficient travel distance, the travel distance of the electric vehicle C2 can be made sufficient by charging the storage battery of the electric vehicle C1 to the storage battery of the electric vehicle C2. That is, when the travel distances of a plurality of electric vehicles are not sufficient, for example, one electric vehicle with good power consumption can be charged from storage batteries of other plurality of electric vehicles to make the travel distance sufficient.

  Moreover, the amount of electricity stored in the storage battery of the electric vehicle C2 having a low power consumption, for example, from the storage battery of the electric vehicle C1 can be switched.

  Also, select an electric car that meets the needs of the electric car from the electric car that can ride a large number of people but has a low electricity cost, and the electric car that can only ride a small number of people but has a good electricity cost, and concentrate the power on the electric car. Can be used.

Furthermore, for example, the electric vehicle C2 can be charged with an amount of electricity corresponding to a traveling distance of 10 km as necessary.
<< Second Embodiment >>
In the present embodiment, as shown in FIG. 9, the electric vehicle power conditioner device 120 includes an EV power conditioner (charging / discharging power conditioner) 1122, a zero cross detection circuit 1301, a voltage fluctuation width detection circuit 1302, and a control. A circuit (second control means) 1310 is provided. In this embodiment, the PV power conditioner 12 has the same configuration as that shown in the first embodiment (that is, the one shown in FIG. 2).

  As shown in FIG. 10, the EV power conditioner 1122 includes changeover switches SW1 and SW2, a charging AC / DC converter 123 that converts an AC voltage into a DC voltage and charges a storage battery of the electric vehicle C, A discharge DC / AC converter 124 that converts the DC power of the storage battery of the automobile C to AC power and outputs the AC power.

  The changeover switch SW1 is switched to the terminal S1a in the system power supply mode, and is switched to the terminal S1b in the solar power generation mode.

  The changeover switch SW2 is normally turned on, and the AC power of the system power supply E is supplied to the first distribution board 20 via the first distribution board 20, the feed line 125, the changeover switch SW2, and the feed line 126. . At the time of a power failure, the changeover switch SW2 is turned off.

  The zero cross detection circuit 1301 detects the zero cross point of the AC voltage output from the discharging DC / AC converter 124. The voltage fluctuation width detection circuit 1302 detects the voltage fluctuation width near the zero cross point detected by the zero cross detection circuit 1301. The control circuit 1310 controls the EV power conditioner 1122.

  Now, for example, as shown in FIG. 11, the voltage may suddenly change in the vicinity of the zero cross point of the AC voltage Vi output from the discharge DC / AC converter 124, and the zero cross detection circuit 1301 reaches the zero cross point. When detected at t2, the voltage fluctuation detection circuit 1302 calculates the voltage difference between the negative peak voltage P3 of the rapid voltage change and the positive peak voltage P4 within a predetermined time from the time t2, that is, the voltage fluctuation width Vq. Ask.

  Then, the control circuit 1310 determines whether or not the voltage fluctuation width Vq obtained by the voltage fluctuation width detection circuit 1302 is equal to or larger than the set value Vk, and when the voltage fluctuation width Vq is equal to or larger than the set value Vk, the EV power conditioner 1122 Stop operation. The setting value Vk can be changed.

The control circuit 1310 controls the discharging DC / AC converter 124 to output the pseudo AC voltage to the first distribution board 20 in order to operate the EV power conditioner 1122 at the time of a power failure. The control circuit 1310 controls switching of the changeover switch SW1 and on / off of the changeover switch SW2.
<< Third embodiment >>
FIG. 12 shows the configuration of a power conditioner device 420 for an electric vehicle according to the third embodiment.

  The electric vehicle power conditioner device 420 detects a zero-crossing point 1301 that detects the zero-crossing point of the AC voltage output from the PV power conditioner 12, and every time the zero-crossing detection circuit 1301 detects a zero-crossing point, the adjacent zero-crossing point is detected. An output calculation unit 422 that calculates the effective value or average value of the charging current or charging voltage of the storage battery of the electric vehicle between points (every half wave of the AC voltage), and the effective value or average value calculated by the output calculation unit 422 is An error calculation unit 423 that calculates an error that is a difference from a preset reference setting value, and a fluctuation detection unit 424 that detects a fluctuation amount of an error signal output from the error calculation unit 423 are provided.

  The control device 410 includes a correction unit 411 that controls the signal width of the switching signal of the charging AC / DC converter 123 so that the error becomes zero based on the error signal output from the error calculation unit 423, and the fluctuation detection unit 424. And a charging stop unit 412 that stops the charging operation by the charging AC / DC converter 123 when the fluctuation amount detected by exceeds a preset fluctuation setting value.

  In addition, a zero-cross detection circuit 301A and a voltage fluctuation width detection circuit 302A are provided, and the control device 410 performs EV power condition based on input signals from the voltage fluctuation width detection circuit 302A, the error calculation unit 423, and the fluctuation detection unit 424. The controller 122 is controlled.

In this embodiment, a PV power conditioner having the same configuration as that of the PV power conditioner 12 shown in the first embodiment is provided.
[Operation]
Next, operation | movement of the power conditioner apparatus 420 for electric vehicles of a present Example is demonstrated.
[Charging mode and grid power mode]
When the charging mode is set and the system power supply mode is set, the changeover switch SW1 is switched to the terminal S1a, and the AC power of the system power supply E is supplied from the first distribution board 20 through the feeder line 125 to the EV power conditioner. 122 is input. The charging AC / DC converter 123 of the EV power conditioner 122 charges the storage battery (not shown) of the electric vehicle C by converting the AC power of the system power source E into DC power.

  On the other hand, the zero cross detection circuit 1301 detects the zero cross point of the AC voltage input from the PV power conditioner 12.

  The output calculation unit 422 calculates the effective value or average value of the charging current or charging voltage of the storage battery of the electric vehicle C between adjacent zero cross points (every half wave) each time the zero cross detection circuit 1301 detects the zero cross point. To go. The error calculation unit 423 obtains an error that is the difference between the effective value or average value calculated by the output calculation unit 422 and a preset reference setting value, and outputs an error signal corresponding to the error. .

  The correction unit 411 of the control device 410 controls the signal width of a switching element (not shown) constituting the charging AC / DC converter 123 according to the error signal output from the error calculation unit 423. That is, the correction unit 411 controls the signal width of the switching element (not shown) of the charging AC / DC converter 123 so that the error calculated by the error calculation unit 423 becomes zero, and at a constant charge amount. The battery of the electric vehicle C is charged. This prevents the storage battery from being charged with a current or voltage higher than the rated value.

  The fluctuation detection unit 424 calculates a fluctuation amount that is a difference between the error signal output from the error calculation unit 423 and the previous error signal from which the error signal is output. The charging stop unit 412 of the control device 410 stops the charging of the storage battery of the electric vehicle C by the charging AC / DC converter 123 when the fluctuation amount detected by the fluctuation detecting unit 424 exceeds a preset fluctuation setting value.

As described above, when the fluctuation amount for each half wave of the AC exceeds the preset fluctuation setting value, the operation of the charging AC / DC converter 123 is stopped. It is possible to reliably prevent the storage battery of the automobile C from being charged.
[Solar power generation mode]
When the solar power generation mode and the charging mode are set, the changeover switch SW1 is switched to the terminal S1b, and the AC power output from the PV power conditioner 12 is supplied to the electric vehicle power via the second distribution board 30 and the feeder line 127. The battery is supplied to the conditioner device 120, and the storage battery of the electric vehicle C is charged in the same manner as in the first embodiment.

In the same manner as described above, the correction unit 411 of the control device 410 sets the signal width of the switching element (not shown) of the charging AC / DC converter 123 so that the error calculated by the error calculation unit 423 becomes zero. The battery of the electric vehicle C is charged with a constant charge amount. This prevents the storage battery from being charged with a current or voltage greater than the rated value. Since other operations are the same as those in the first embodiment, description thereof will be omitted.
<< 4th Example >>
FIG. 13 shows a configuration of a power conditioner device 520 for an electric vehicle according to a fourth embodiment.

  The charging AC / DC converter 123 shown in FIG. 13 has a full-wave rectification circuit 501 that full-wave rectifies and smoothes an input AC voltage, and a rectified and smoothed voltage that is full-wave rectified and smoothed by the full-wave rectification circuit 501. And a DC / DC converter 502 for converting the signal into a predetermined DC voltage.

  In the electric vehicle power conditioner device 520, the electric vehicle power conditioner device 420 according to the third embodiment samples the rectified and smoothed voltage output from the full-wave rectifier circuit 501, and the sampling unit 521 performs sampling. And a comparison unit 522 that compares the sampling voltage with a preset voltage (threshold value) set in advance.

  The charging stop unit 412 of the control device 510 stops the charging operation of the DC / DC converter 502 when the comparison unit 522 determines that the sampling voltage is equal to or lower than the set voltage. Since other operations are the same as those of the third embodiment, description thereof will be omitted.

  In the present embodiment, the charging operation of the DC / DC converter 502 is stopped when the AC voltage output from the PV power conditioner 12 is low and the charging is not possible, and the DC / DC converter 502 is stopped. This prevents a wasteful charging operation due to.

  In this embodiment, the PV power conditioner 12 has the same configuration as that shown in the first embodiment (that is, the one shown in FIG. 2).

  Although the embodiments of the present invention have been described in detail with reference to the drawings, each of the above embodiments is only an example of the present invention, and the present invention is not limited only to the configuration of each of the above embodiments. . Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

  For example, although the solar power generation system 10 is used in each of the above embodiments, the present invention is not limited thereto, and a wind power generation system or the like may be used.

10 Photovoltaic power generation system 11 Photovoltaic power generation device (power generation means)
12 PV power conditioner (Power conditioner for power generation)
12c Zero cross detection circuit 12d Voltage fluctuation range detection circuit 20 First distribution board (distribution board)
30 Second distribution board (distribution board)
120 Electric vehicle power conditioner device 122 EV power conditioner (charge / discharge power conditioner)
250 control circuit (first control means)
300 Strain detection circuit (strain detection means)
301 Voltage waveform detection circuit 302 Reference waveform generation circuit 303 Comparison circuit 310 Control circuit (second control means)
1301 Zero cross detection circuit 1302 Voltage fluctuation range detection circuit 1310 Control circuit (second control means)
S1 Charging / discharging system E Power grid (system power supply)
C electric car

Claims (10)

Supply the AC power supplied from the distribution board connected to the system power supply and the natural energy power generation system to the storage battery of the electric vehicle, or convert the DC power output from the storage battery to the AC power to convert the distribution board The natural energy power generation system converts the DC power generated by the natural energy into AC power synchronized with the AC voltage of the system power supply and supplies it to the distribution board. It has a power conditioner for power generation to output, and in the event of a power failure, the power conditioner for charging / discharging outputs a pseudo AC voltage from the DC / AC converter for discharge, and the power conditioner for power generation is synchronized with the pseudo AC voltage A charge / discharge system that outputs AC power,
A zero-cross detection circuit for detecting a zero-cross point of the AC voltage output from the power conditioner for power generation;
A voltage fluctuation width detection circuit for detecting a fluctuation width of the AC voltage near the zero cross point detected by the zero cross detection circuit;
A first control means for controlling a discharge operation of the charge / discharge power conditioner based on whether or not a fluctuation width detected by the voltage fluctuation width detection circuit exceeds a preset value; and the pseudo AC voltage Strain detection means for detecting the distortion voltage of
A charge / discharge system comprising: second control means for controlling the discharge DC / AC converter so as to reduce the distortion voltage based on the distortion voltage detected by the distortion detection means.   2. The charge / discharge according to claim 1, wherein the second control unit controls the discharge DC / AC converter when a distortion voltage detected by the distortion detection unit exceeds a preset threshold value. system.   The charge / discharge system according to claim 2, wherein the threshold value can be changed.   The charge / discharge system according to claim 2 or 3, wherein the determination as to whether or not the strain voltage detected by the strain detection means exceeds a threshold value is performed a plurality of times.   The charge / discharge system according to claim 4, wherein the determination is continuously performed for each half wave of the pseudo AC voltage.   The distortion detection means includes a voltage waveform detection circuit that detects a voltage waveform of an AC voltage output from the discharge DC / AC converter, a reference waveform generation circuit that generates a sine wave reference waveform having the same frequency as the system power supply, and 6. A comparison circuit for comparing a reference waveform generated by the reference waveform generation circuit with a detection voltage waveform detected by the voltage waveform detection circuit and detecting a difference therebetween. The charge / discharge system according to claim 1.   The charge / discharge system according to claim 1, further comprising a low-pass filter that removes a high-frequency component contained in the pseudo AC voltage.   The charge / discharge system according to claim 1, wherein the setting value can be changed. The charge / discharge power conditioner converts a rectified and smoothed voltage rectified and smoothed by the full-wave rectifier circuit into a predetermined DC voltage by rectifying and smoothing an AC voltage output from the power generator for power generation. And a switching type DC / DC converter for charging the storage battery,
Each time the zero-cross detection circuit detects a zero-cross point, an output calculation unit that calculates an effective value or an average value of the charging current or charging voltage of the storage battery between adjacent zero-cross points; and
An error calculation unit that calculates an error that is a difference between an effective value or an average value calculated by the output calculation unit and a preset reference setting value, and outputs an error signal according to the error; and
Based on the error signal output by the error calculation unit, a correction unit that controls the signal width of the switching signal of the DC / DC converter so that the error becomes zero,
A fluctuation detecting unit for detecting a fluctuation amount of the error signal with respect to the error signal before the error signal is output;
The charge stop part which stops the charge operation by the said DC / DC converter when the variation | change_quantity detected by this fluctuation | variation detection part exceeds the preset fluctuation setting value is provided, The charge stop part characterized by the above-mentioned. The charge / discharge system as described in any one of Claims. A sampling unit that samples the rectified and smoothed voltage of the full-wave rectifier circuit each time the zero-cross detection circuit detects a zero-cross point;
Comparing the sampling voltage sampled by this sampling unit with a preset setting voltage,
The charge / discharge system according to claim 9, wherein when the comparison unit determines that the sampling voltage is equal to or lower than a set voltage, the charging operation by the DC / DC converter is stopped.