CN104422849A - Short circuit simulation test circuit and test method thereof - Google Patents

Abstract

The invention discloses a short circuit simulation test circuit which is used for testing and examining the operation condition of a converter valve. The short circuit simulation test circuit comprises a capacity charge power supply module, a fault current generation circuit and a converter valve charging source module, wherein the cathode of the capacity charge power supply module is connected with a positive input end of the fault current generation circuit while the anode of the capacity charge power supply module is connected with a negative input end of the fault current generation circuit; a positive input end of the fault current generation circuit is connected with the anode of the converter valve charging source module and a high voltage output end of the converter valve respectively, and the negative output end of the fault current generation circuit is connected with the cathode of the capacity charge power supply module and the low voltage output end of the converter valve respectively. The test circuit can be used for testing and examining the fault operation condition of converter value. The invention further discloses a test method of the short circuit simulation test circuit.

Description

A kind of short circuit simulation experiment circuit and test method thereof

Technical field

The present invention relates to the running test method of high-power electric and electronic technology, specifically a kind of short circuit simulation experiment circuit and test method.

Background technology

Along with the application of High Power Electronic Converter Technology in electric system, the reliability of its core component---converter valve becomes the key of security of system.System voltage is high, electric current is large, capacity is large, the full live road being difficult to build same actual operating mode identical in experimental enviroment is tested, therefore in experimental enviroment, how to build the hookup of equivalence, carry out the test suitable with actual operating mode intensity and become the key of dealing with problems.

In the actual motion based on turn-off device valve high power electronic equipment; can occur because the reasons such as the system failure, DC side earth fault cause the anti-paralleled diode excess current of insulated gate bipolar transistor in module (IGBT); due to the uncontrollability of diode; self cannot turn off excess current; simultaneously because system protection is longer for actuation time; diode must bear the excess current between age at failure, but excess current during fault can considerably beyond the tolerance value of device itself.Its design for the maximum current under fault current operating condition, voltage and temperature stress effect of object test carrying out short circuit simulation test is correct.The big current of actual condition must be injected to measurand by peripheral circuit in test.

Summary of the invention

Object of the present invention, is to provide a kind of short circuit simulation experiment circuit and test method thereof, and it can realize examining the test of converter valve accident operating condition.

In order to reach above-mentioned purpose, solution of the present invention is:

A kind of short circuit simulation experiment circuit, for carrying out test examination to the operating condition of converter valve; Described short circuit simulation experiment circuit comprises capacitor charging power module, fault current circuit for generating and converter valve charging power modules, the negative pole of capacitor charging power module connects the positive polarity input end of fault current circuit for generating, and the positive pole of capacitor charging power module connects the negative polarity input end of fault current circuit for generating; The positive polarity output terminal of described fault current circuit for generating connects the positive pole of converter valve charging power modules and the high-voltage output end of converter valve respectively, and the negative polarity output terminal of fault current circuit for generating connects the negative pole of converter valve charging power modules and the low-voltage output of converter valve respectively.

Above-mentioned capacitor charging power module comprises the first direct supply and the 3rd gauge tap, the two is composed in series series arm mutually, and define the positive pole that this series arm one end consistent with the positive extreme direction of the first direct supply is capacitor charging power module, define the negative pole of another very capacitor charging power module.

Above-mentioned fault current circuit for generating comprises electric capacity, inductance, the first resistance, the second resistance, diode, the first gauge tap and the second gauge tap, wherein, after described electric capacity and the first resistor coupled in parallel, mutually series arm is composed in series again with the second resistance, inductance, this series arm again with diodes in parallel, and the anode of described diode also connects one end of the first gauge tap, the negative electrode of diode connects one end of the second gauge tap; The anode of definition diode is the positive polarity input end of fault current circuit for generating, the negative electrode of definition diode is the negative polarity input end of fault current circuit for generating, the other end defining the first gauge tap is the positive polarity output terminal of fault current circuit for generating, and the other end defining the second gauge tap is the negative polarity output terminal of fault current circuit for generating.

Above-mentioned inductance adopts controllable impedance, and the second resistance adopts adjustable resistance.

Above-mentioned converter valve charging power modules comprises the 4th gauge tap and the second direct supply, the two is composed in series series arm mutually, define the positive pole that this series arm one end consistent with the positive extreme direction of the second direct supply is converter valve charging power modules, the definition other end is the negative pole of converter valve charging power modules.

Above-mentioned converter valve comprises the connection of the power semiconductor switch module composition that at least one is arranged in the same way.

Above-mentioned converter valve adopts modularization multi-level converter or H bridge cascade connection type transducer.

Based on the test method of foregoing a kind of short circuit simulation experiment circuit, comprise the steps:

(1) closed 4th gauge tap, disconnect first, second and third gauge tap, the second direct supply of described converter valve charging power modules charges to converter valve, until module working voltage disconnects the 4th gauge tap;

(2) closed 3rd gauge tap, the first direct supply of described capacitor charging power module, to the capacitor charging of fault current circuit for generating, until reach charging voltage, disconnects the 3rd gauge tap;

(3) closed first gauge tap and the second gauge tap, make the positive half cycle of electric current flow through electric capacity, inductance, the second resistance and converter valve, make electric current negative half period flow through diode;

(4) current parameters in writing circuit, analyzes.

After adopting such scheme, the present invention has following characteristics:

(1) test method of the present invention, only need to control the operation that deciliter can to realize circuit of several switch, control simple, it is convenient to realize, and the security for test unit is very favourable;

(2) method provided by the invention is by the fault current circuit for generating in hookup, the superposition of the sinusoidal half-wave current of exponential damping is put on converter valve, converter valve is made to tolerate heat with the suitable transient current of physical fault operating mode, transient state and loss intensity, realize examining, for the reliability service of converter valve is given security the test of converter valve operating condition.

Accompanying drawing explanation

Fig. 1 is the integrated stand composition of hookup of the present invention;

Fig. 2 is the current waveform figure of converter valve.

Embodiment

Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.

As shown in Figure 1, the invention provides a kind of short circuit simulation experiment circuit, for carrying out test examination to the operating condition of converter valve 4, described converter valve 4 comprises the connection of the power semiconductor switch module composition that at least one is arranged in the same way, specifically can adopt converter valve thyristor 16, modularization multi-level converter or H bridge cascade connection type transducer can be adopted; Described hookup comprises capacitor charging power module 1, fault current circuit for generating 2 and converter valve charging power modules 3, the negative pole of capacitor charging power module 1 connects the positive polarity input end of fault current circuit for generating 2, and the positive pole of capacitor charging power module 1 connects the negative polarity input end of fault current circuit for generating 2; The positive polarity output terminal of described fault current circuit for generating 2 connects the positive pole of converter valve charging power modules 3 and the high-voltage output end of converter valve 4 respectively, and the negative polarity output terminal of fault current circuit for generating 2 connects the negative pole of converter valve charging power modules 3 and the low-voltage output of converter valve 4 respectively.Below each several part is introduced respectively.

Described capacitor charging power module 1 comprises the first direct supply 5 and the 3rd gauge tap 6, the two is composed in series series arm mutually, and define the positive pole that this series arm one end consistent with the positive extreme direction of the first direct supply 5 is capacitor charging power module 1, define the negative pole of another very capacitor charging power module 1.

Described fault current circuit for generating 2 comprises electric capacity 8, inductance 10, first resistance 9, second resistance 7, first gauge tap 12, second gauge tap 13 and diode 11, wherein, the capacity of electric capacity 8 is 10mF, inductance 10 adopts 0 ~ 20mH adjustable, the resistance of the first resistance 9 is 10000 ohm, the resistance 0 ~ 10 ohm of the second resistance 7 is adjustable, wherein, the inductance value of inductance 10 is adjustable, by regulating its inductance value, the oscillation frequency of fault current circuit for generating 2 output current can be controlled, the resistance of the second resistance 7 is adjustable, by regulating its resistance, the attenuation coefficient of fault current circuit for generating 2 output current can be controlled, after described electric capacity 8 and the first resistance 9 parallel connection, mutually series arm is composed in series with the second resistance 7, inductance 10, this series arm is in parallel with diode 11 again, and the anode of described diode 11 also connects one end of the first gauge tap 12, the negative electrode of diode 11 connects one end of the second gauge tap 13, the anode of definition diode 11 is the positive polarity input end of fault current circuit for generating 2, the negative electrode of definition diode 11 is the negative polarity input end of fault current circuit for generating 2, the other end defining the first gauge tap 12 is the positive polarity output terminal of fault current circuit for generating 2, and the other end defining the second gauge tap 13 is the negative polarity output terminal of fault current circuit for generating 2.

In aforementioned fault current circuit for generating 2, the inductance value of inductance 10 is adjustable, and the resistance of the second resistance 7 is adjustable, and according to electric capacity, inductance, resistant series resonance principle, the change of electric current meets:

$i_L\left(t\right)=-\frac{U_0}{{\mathrm{\ω}}_{d}L}{e}^{-\mathrm{\αt}}\sin \left({\mathrm{\ω}}_{d}t\right)(t\≥0)$

$\mathrm{\α}=\frac{R}{2L}$

${\mathrm{\ω}}_d=\sqrt{\frac{1}{\mathrm{LC}}-{\left(\frac{R}{2L}\right)}^2}$

Wherein, U ₀for electric capacity initial voltage, L is inductance value, and C is capacitance, i _lfor current value.According to above formula, by regulating the inductance value of inductance 10 in fault current circuit for generating 2, the oscillation frequency of this circuit output current can be controlled; By regulating the resistance of the second resistance 7, the attenuation coefficient of this circuit output current can be controlled.

Described converter valve charging power modules 3 comprises the 4th gauge tap 14 and the second direct supply 15, the two is composed in series series arm mutually, define the positive pole that this series arm one end consistent with the positive extreme direction of the second direct supply 15 is converter valve charging power modules 3, the definition other end is the negative pole of converter valve charging power modules 3.

The present invention also provides a kind of test method of aforementioned short circuit simulation experiment circuit, comprises the steps:

(1) closed 4th gauge tap 14, disconnect the first gauge tap 12, second gauge tap 13 and the 3rd gauge tap 6, the second direct supply 15 pairs of converter valve 4 of described converter valve charging power modules 3 are charged, until module working voltage, disconnect the 4th gauge tap 14;

(2) closed 3rd gauge tap 6, the target reso nance galvanometer according to producing calculates charging voltage.The electric capacity 8 of the first direct supply 5 pairs of fault current circuit for generatings 2 of described capacitor charging power module 1 charges, until reach charging voltage to disconnect the 3rd gauge tap 6, stops charging;

(3) closed first gauge tap 12 and the second gauge tap 13, makes the positive half cycle of electric current flow through electric capacity 8, inductance 10, second resistance 9 and converter valve 4, makes electric current negative half period flow through diode 11;

(4) record the total current I1 of converter valve 4 and the electric current I 2 of converter valve thyristor 16, oscillogram as shown in Figure 2.

Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.

Claims (8)

1. a short circuit simulation experiment circuit, for carrying out test examination to the operating condition of converter valve; It is characterized in that, described short circuit simulation experiment circuit comprises capacitor charging power module, fault current circuit for generating and converter valve charging power modules, the negative pole of capacitor charging power module connects the positive polarity input end of fault current circuit for generating, and the positive pole of capacitor charging power module connects the negative polarity input end of fault current circuit for generating; The positive polarity output terminal of described fault current circuit for generating connects the positive pole of converter valve charging power modules and the high-voltage output end of converter valve respectively, and the negative polarity output terminal of fault current circuit for generating connects the negative pole of converter valve charging power modules and the low-voltage output of converter valve respectively.

2. a kind of short circuit simulation experiment circuit as claimed in claim 1, it is characterized in that: described capacitor charging power module comprises the first direct supply and the 3rd gauge tap, the two is composed in series series arm mutually, and define the positive pole that this series arm one end consistent with the positive extreme direction of the first direct supply is capacitor charging power module, define the negative pole of another very capacitor charging power module.

3. a kind of short circuit simulation experiment circuit as claimed in claim 2, it is characterized in that: described fault current circuit for generating comprises electric capacity, inductance, the first resistance, the second resistance, diode, the first gauge tap and the second gauge tap, wherein, after described electric capacity and the first resistor coupled in parallel, mutually series arm is composed in series again with the second resistance, inductance, this series arm again with diodes in parallel, and the anode of described diode also connects one end of the first gauge tap, the negative electrode of diode connects one end of the second gauge tap; The anode of definition diode is the positive polarity input end of fault current circuit for generating, the negative electrode of definition diode is the negative polarity input end of fault current circuit for generating, the other end defining the first gauge tap is the positive polarity output terminal of fault current circuit for generating, and the other end defining the second gauge tap is the negative polarity output terminal of fault current circuit for generating.

4. a kind of short circuit simulation experiment circuit as claimed in claim 3, is characterized in that: described inductance adopts controllable impedance, and the second resistance adopts adjustable resistance.

5. a kind of short circuit simulation experiment circuit as claimed in claim 3, it is characterized in that: described converter valve charging power modules comprises the 4th gauge tap and the second direct supply, the two is composed in series series arm mutually, define the positive pole that this series arm one end consistent with the positive extreme direction of the second direct supply is converter valve charging power modules, the definition other end is the negative pole of converter valve charging power modules.

6. a kind of short circuit simulation experiment circuit as claimed in claim 1, is characterized in that: described converter valve comprises the connection of the power semiconductor switch module composition that at least one is arranged in the same way.

7. a kind of short circuit simulation experiment circuit as claimed in claim 6, is characterized in that: described converter valve adopts modularization multi-level converter or H bridge cascade connection type transducer.

8., based on the test method of a kind of short circuit simulation experiment circuit as claimed in claim 5, it is characterized in that comprising the steps:

(1) closed 4th gauge tap, disconnect first, second and third gauge tap, the second direct supply of described converter valve charging power modules charges to converter valve, until module working voltage disconnects the 4th gauge tap;

(2) closed 3rd gauge tap, the first direct supply of described capacitor charging power module, to the capacitor charging of fault current circuit for generating, until reach charging voltage, disconnects the 3rd gauge tap;

(3) closed first gauge tap and the second gauge tap, make the positive half cycle of electric current flow through electric capacity, inductance, the second resistance and converter valve, make electric current negative half period flow through diode;

(4) current parameters in writing circuit, analyzes.