CN114430249B - A smart photovoltaic shut-off device - Google Patents
A smart photovoltaic shut-off deviceInfo
- Publication number
- CN114430249B CN114430249B CN202210063618.7A CN202210063618A CN114430249B CN 114430249 B CN114430249 B CN 114430249B CN 202210063618 A CN202210063618 A CN 202210063618A CN 114430249 B CN114430249 B CN 114430249B
- Authority
- CN
- China
- Prior art keywords
- switching transistor
- photovoltaic module
- coupling capacitor
- photovoltaic
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Photovoltaic Devices (AREA)
Abstract
一种智能光伏关断器，包括光伏组件、PLC解调电路、开关管驱动电路、第一耦合电容、第二耦合电容、第一开关管、旁路二极管及负载电阻；第一开关管的源极连接光伏组件的负极，第一开关管的漏极连接旁路二极管的阳极，第一开关管的栅极与开关管驱动电路电性连接；第二耦合电容的第一端连接光伏组件的正极，第二耦合电容的第二端与PLC解调电路电性连接；电容的第一端连接第一开关管的源极，电容的第二端连接第一开关管的漏极；旁路二极管的阴极连接光伏组件的正极；负载电阻的第一端连接第一开关管的漏极，负载电阻的第二端连接光伏组件的正极。本发明提出了一种结构简单、低成本的基于电力线载波通信的光伏关断器结构。
A smart photovoltaic (PV) switch includes a photovoltaic module, a PLC demodulation circuit, a switching transistor drive circuit, a first coupling capacitor, a second coupling capacitor, a first switching transistor, a bypass diode, and a load resistor. The source of the first switching transistor is connected to the negative terminal of the photovoltaic module, the drain of the first switching transistor is connected to the anode of the bypass diode, and the gate of the first switching transistor is electrically connected to the switching transistor drive circuit. The first terminal of the second coupling capacitor is connected to the positive terminal of the photovoltaic module, and the second terminal of the second coupling capacitor is electrically connected to the PLC demodulation circuit. The first terminal of the capacitor is connected to the source of the first switching transistor, and the second terminal of the capacitor is connected to the drain of the first switching transistor. The cathode of the bypass diode is connected to the positive terminal of the photovoltaic module. The first terminal of the load resistor is connected to the drain of the first switching transistor, and the second terminal of the load resistor is connected to the positive terminal of the photovoltaic module. This invention proposes a simple and low-cost photovoltaic switch structure based on power line carrier communication.
Description
Technical Field
The invention relates to the technical field of distributed photovoltaics, in particular to an intelligent photovoltaic shutoff device.
Background
Solar energy is becoming more and more important as a clean energy source. With further reduction of the cost of photovoltaic power generation, the installed capacity of photovoltaic power generation also presents an explosive growth situation.
At present, a photovoltaic power generation system generally adopts a serial structure, and photovoltaic modules after serial connection can form direct current high voltage of kilovolts, so that safety risks can be formed for personnel under the conditions of maintenance, fire fighting and the like. Therefore, some countries and regions have come out of the relevant standards, and the photovoltaic power generation system is required to support the rapid shutdown function of the component level, so that high direct current voltage is avoided under the conditions of fire protection, maintenance and the like, and potential safety hazards are eliminated.
To realize the shutdown function at the component level, the shutdown device needs to have a communication capability to receive the on or off signal, and the power line carrier communication is widely used in the photovoltaic component shutdown device because no additional wiring is required. In the prior art of the photovoltaic module shutoff device (such as CN 212367219U), an inductor is connected in series in a photovoltaic direct current loop to provide alternating current impedance of a power line carrier signal, so that a PLC demodulation circuit can be conveniently coupled out of the carrier signal. However, as the power generated by a single photovoltaic module is larger, the string current in the photovoltaic string is larger, and the series inductor itself has a certain direct current resistance, and under a large current, the series inductor consumes higher power consumption to generate heat. For example, when the string current is 20A and the dc resistance of the series inductor is 5mΩ, the series inductor consumes 2W of power. Therefore, in a narrow space of the photovoltaic junction box, heat is not easy to dissipate, high temperature exists in the photovoltaic junction box due to 2W power, ageing and cracking of the plastic junction box and glue are accelerated, and potential safety hazards exist. Meanwhile, the inductance with large rated current has high cost and high price, and is not beneficial to popularization of the photovoltaic junction box.
Therefore, how to solve the above-mentioned drawbacks of the prior art is a subject to be studied and solved by the present invention.
Disclosure of Invention
The invention aims to provide an intelligent photovoltaic shutoff device.
In order to achieve the above purpose, the invention adopts the following technical scheme:
An intelligent photovoltaic turnoff device comprises a photovoltaic module, a PLC demodulation circuit, a switching tube driving circuit, a first coupling capacitor, a second coupling capacitor, a first switching tube, a bypass diode and a load resistor;
the source electrode of the first switching tube is connected with the negative electrode of the photovoltaic module, the drain electrode of the first switching tube is connected with the anode of the bypass diode, and the grid electrode of the first switching tube is electrically connected with the switching tube driving circuit;
The PLC demodulation circuit is electrically connected with the switching tube driving circuit;
The first end of the first coupling capacitor is connected with the source electrode of the first switching tube, and the second end of the first coupling capacitor is connected with the drain electrode of the first switching tube;
the first end of the second coupling capacitor is connected with the positive electrode of the photovoltaic module, and the second end of the second coupling capacitor is electrically connected with the PLC demodulation circuit;
The cathode of the bypass diode is connected with the anode of the photovoltaic module;
and the first end of the load resistor is connected with the drain electrode of the first switching tube, and the second end of the load resistor is connected with the anode of the photovoltaic module.
The relevant content explanation in the technical scheme is as follows:
1. In the above scheme, the switch further comprises a second switch tube, and when the first switch tube is turned off, the second switch tube is turned on;
the source electrode of the second switching tube is connected with the drain electrode of the first switching tube, the drain electrode of the second switching tube is connected with the positive electrode of the photovoltaic module, and the grid electrode of the second switching tube is electrically connected with the PLC demodulation module.
2. In the above scheme, the photovoltaic module comprises a panel, a parasitic capacitor, a resistor and a parasitic inductor;
the resistor is connected in series with the parasitic inductor, one end of the resistor is connected with the positive electrode of the battery plate, one end of the parasitic capacitor is connected with the positive electrode of the battery plate, and the other end of the parasitic capacitor is connected with the negative electrode of the battery plate.
The working principle and the advantages of the invention are as follows:
the intelligent photovoltaic shutoff device comprises a photovoltaic module, a PLC demodulation circuit, a switching tube driving circuit, a first coupling capacitor, a second coupling capacitor, a first switching tube, a bypass diode and a load resistor, wherein a source electrode of the first switching tube is connected with a cathode of the photovoltaic module, a drain electrode of the first switching tube is connected with an anode of the bypass diode, a grid electrode of the first switching tube is electrically connected with the switching tube driving circuit, a first end of the second coupling capacitor is connected with an anode of the photovoltaic module, a second end of the second coupling capacitor is electrically connected with the PLC demodulation circuit, a first end of the first coupling capacitor is connected with a source electrode of the first switching tube, a second end of the first coupling capacitor is connected with a drain electrode of the first switching tube, a cathode of the bypass diode is connected with an anode of the photovoltaic module, a first end of the load resistor is connected with a drain electrode of the first switching tube, and a second end of the load resistor is connected with an anode of the photovoltaic module.
Compared with the prior art, the invention provides a photovoltaic turnoff structure based on power line carrier communication, which has a simple structure and low cost. The invention uses the parasitic inductance of the photovoltaic module as the carrier signal load, and compared with the prior art, the invention greatly simplifies the carrier signal sampling coupling circuit and reduces the cost. Meanwhile, the potential safety hazard caused by heating of the series inductor under high current is avoided, and the reliability of the shutoff device is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art PLC coupling circuit;
FIG. 2 is a schematic circuit diagram of an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention;
fig. 4 is a graph of typical frequency response of a photovoltaic module according to an embodiment of the present invention.
In the above figures, 101, photovoltaic modules, 102, switching tube driving circuits, 103, the PLC demodulation circuit, 104, first coupling capacitors, 105, second coupling capacitors, 106, first switching tubes, 107, bypass diodes, 108, load resistors, 109, second switching tubes, PS. battery plates, cp. parasitic capacitors, rs. resistors and Lp. parasitic inductances.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples:
Examples the present invention will be described in detail in the drawings and detailed description below, and any person skilled in the art, after having the knowledge of the examples of the present invention, may make variations and modifications in the techniques taught by the present invention without departing from the spirit and scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. Singular forms such as "a," "an," "the," and "the" are intended to include the plural forms as well, as used herein.
The terms "first," "second," and the like, as used herein, do not denote a particular order or sequence, nor are they intended to be limiting, but rather are merely used to distinguish one element or operation from another in the same technical term.
As used herein, the terms "comprising," "including," "having," and the like are intended to be open-ended terms, meaning including, but not limited to.
The term (terms) as used herein generally has the ordinary meaning of each term as used in this field, in this disclosure, and in the special context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description herein.
Referring to fig. 2, an intelligent photovoltaic shutoff device includes a photovoltaic module 101, a switching tube driving circuit 102, a PLC (power line carrier) demodulation circuit 103, a first coupling capacitor 104, a second coupling capacitor 105, a first switching tube 106, a bypass diode 107, and a load resistor 108.
The PLC demodulation circuit 103 is electrically connected to the switching tube driving circuit 102.
The source (S) of the first switching tube 106 is connected to the negative electrode (PV-) of the photovoltaic module 101, the drain (D) of the first switching tube 106 is connected to the anode of the bypass diode 107, and the gate (G) of the first switching tube 106 is electrically connected to the switching tube driving circuit 102.
The first end of the first coupling capacitor 104 is connected with the source electrode (S) of the first switching tube 106, the second end of the first coupling capacitor 104 is connected with the drain electrode (D) of the first switching tube 106, and the first coupling capacitor 104 is connected in parallel with the source-drain end of the first switching tube 106 and is used for providing an alternating current path for alternating current carrier signals when the first switching tube 106 is turned off.
The first end of the load resistor 108 is connected to the drain electrode (D) of the first switching tube 106, and the second end of the load resistor 108 is connected to the positive electrode (pv+) of the photovoltaic module 101. The load resistor 108 is connected between the output Vout+/Vout of the shutoff device and has a resistance greater than 10KΩ, and can provide a reverse current to the first switching tube 106 when the first switching tube 106 is turned off.
The cathode of the bypass diode 107 is connected with the positive electrode (PV+), and the bypass diode 107 is connected between the positive electrode and the negative electrode of the output of the shutoff device and is used for providing a current path for other series components when the first switching tube 106 is turned off so as to prevent high voltage from occurring between the source and the drain of the first switching tube 106 and between Vout+/Vout-.
Preferably, the photovoltaic module further comprises a second switch tube 109, when the first switch tube 106 is turned off, the second switch tube 109 is turned on, a source electrode (S) of the second switch tube 109 is connected to a drain electrode (D) of the first switch tube 106, the drain electrode (D) of the second switch tube 109 is connected to an anode (pv+), and a gate electrode (G) of the second switch tube 109 is electrically connected to the switch tube driving circuit 102.
The first switching tube 106 and the second switching tube 109 may be high-power MOSFET devices, or may be other electronic switches of IGBTs and thyristors.
The second switching tube 109 and the first switching tube 106 may not be turned on at the same time, and when the first switching tube 106 is turned off, the second switching tube 109 is turned on to provide a current path for other series components. Since the bypass diode 107 has a certain on voltage (usually about 0.6V), when the first switching tube 106 is turned off and the string current is large, the bypass diode 107 consumes high power consumption to generate heat seriously, and in extreme cases, the turn-off device is damaged and even a fire is caused. After adding the second switching tube 109, the second switching tube 109 is turned on when the first switching tube 106 is turned off, and the heat generated when a large current flows through the second switching tube 109 is far lower than the heat generated when a current flows through the bypass diode 107 because the on-resistance of the second switching tube 109 is low, so that the risk is reduced.
The first end of the second coupling capacitor 105 is connected to the positive electrode (pv+) -of the photovoltaic module 101, and the second end of the second coupling capacitor 105 is electrically connected to the PLC demodulation circuit 103. The second coupling capacitor 105 is configured to couple the carrier signals sampled by the positive electrode (pv+ and PV-) of the photovoltaic module 101 into the PLC demodulation circuit 103 for demodulation, and after the PLC demodulation circuit 103 demodulates the control information sent by the sending end, the first switching tube 106 and the second switching tube 109 are correspondingly controlled by the switching tube driving circuit 102.
As shown in fig. 3, the photovoltaic module 101 includes a panel PS, a parasitic capacitor Cp, a resistor Rs, and a parasitic inductance Lp, where the resistor Rs is connected in series with the parasitic inductance Lp, and one end of the resistor Rs is connected to the positive electrode of the panel PS, and one end of the parasitic capacitor Cp is connected to the positive electrode of the panel PS, and the other end is connected to the negative electrode of the panel PS.
The parasitic inductance Lp has a value of 5uH, the resistor Rs has a value of 1Ω, and the parasitic capacitance Cp has a value of 100uF.
Preferably, since the parasitic inductance Lp and the parasitic capacitance Cp of the photovoltaic module 101 exhibit the band-stop characteristic (fig. 4), in order to reduce the attenuation of the PLC signal by the photovoltaic module 101, the carrier frequency band needs to avoid the band-stop portion of the photovoltaic module 101. If the carrier frequency band is selected from the low frequency band, the coupling capacitors 104 and 105 with larger capacitance are needed, and the cost is higher, so that the carrier frequency band is preferably selected from about 1 MHz.
If the first switching tube 106 is a PMOS device, the source electrode (S) is connected with PV+, the drain electrode (D) is connected with Vout+, and the grid electrode is connected with the switching tube driving circuit, and if the first switching tube is an NMOS device, the source electrode (S) is connected with Vout+, the drain electrode (D) is connected with PV+, and the grid electrode is connected with the switching tube driving circuit.
Compared with the prior art, the invention provides a photovoltaic turnoff structure based on power line carrier communication, which has a simple structure and low cost. The invention uses the parasitic inductance of the photovoltaic module as the carrier signal load, and compared with the prior art, the invention greatly simplifies the carrier signal sampling coupling circuit and reduces the cost. Meanwhile, the potential safety hazard caused by heating of the series inductor under high current is avoided, and the reliability of the shutoff device is improved.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021229427195 | 2021-11-26 | ||
| CN202122942719 | 2021-11-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114430249A CN114430249A (en) | 2022-05-03 |
| CN114430249B true CN114430249B (en) | 2026-04-28 |
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ID=81313211
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220147445.2U Withdrawn - After Issue CN217135444U (en) | 2021-11-26 | 2022-01-20 | Intelligent photovoltaic shutoff device |
| CN202210063618.7A Active CN114430249B (en) | 2021-11-26 | 2022-01-20 | A smart photovoltaic shut-off device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220147445.2U Withdrawn - After Issue CN217135444U (en) | 2021-11-26 | 2022-01-20 | Intelligent photovoltaic shutoff device |
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| CN (2) | CN217135444U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217135444U (en) * | 2021-11-26 | 2022-08-05 | 苏州门海微电子科技有限公司 | Intelligent photovoltaic shutoff device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205070786U (en) * | 2015-10-30 | 2016-03-02 | 高海凌 | High -efficient photovoltaic power optimizer series connection topology circuit |
| CN206517367U (en) * | 2017-01-18 | 2017-09-22 | 常熟市福莱德连接器科技有限公司 | A kind of intelligent wiring box of elimination PID decays |
| CN210780124U (en) * | 2019-12-13 | 2020-06-16 | 浙江佳明天和缘光伏科技有限公司 | A DC current type PLC photovoltaic fast shutdown device |
| CN212367219U (en) * | 2020-06-12 | 2021-01-15 | 江苏集能易新能源技术有限公司 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device |
| CN217135444U (en) * | 2021-11-26 | 2022-08-05 | 苏州门海微电子科技有限公司 | Intelligent photovoltaic shutoff device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827130B (en) * | 2016-05-26 | 2019-04-09 | 阳光电源股份有限公司 | A Cascaded Multilevel Inverter System |
| CN206820748U (en) * | 2017-03-22 | 2017-12-29 | 华北电力大学 | Carrier signal termination power for single conductor carrier communication between photovoltaic module |
| CN206611172U (en) * | 2017-04-11 | 2017-11-03 | 丰郅(上海)新能源科技有限公司 | Photovoltaic module rapidly switches off circuit |
| CN108964267B (en) * | 2018-06-29 | 2024-04-19 | 江苏集能易新能源技术有限公司 | DC voltage type PLC photovoltaic shutoff ware circuit |
-
2022
- 2022-01-20 CN CN202220147445.2U patent/CN217135444U/en not_active Withdrawn - After Issue
- 2022-01-20 CN CN202210063618.7A patent/CN114430249B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205070786U (en) * | 2015-10-30 | 2016-03-02 | 高海凌 | High -efficient photovoltaic power optimizer series connection topology circuit |
| CN206517367U (en) * | 2017-01-18 | 2017-09-22 | 常熟市福莱德连接器科技有限公司 | A kind of intelligent wiring box of elimination PID decays |
| CN210780124U (en) * | 2019-12-13 | 2020-06-16 | 浙江佳明天和缘光伏科技有限公司 | A DC current type PLC photovoltaic fast shutdown device |
| CN212367219U (en) * | 2020-06-12 | 2021-01-15 | 江苏集能易新能源技术有限公司 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device |
| CN217135444U (en) * | 2021-11-26 | 2022-08-05 | 苏州门海微电子科技有限公司 | Intelligent photovoltaic shutoff device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN217135444U (en) | 2022-08-05 |
| CN114430249A (en) | 2022-05-03 |
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