WO2020000864A1 - Direct current voltage-type plc photovoltaic shutdown device circuit - Google Patents

Direct current voltage-type plc photovoltaic shutdown device circuit Download PDF

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Publication number
WO2020000864A1
WO2020000864A1 PCT/CN2018/115020 CN2018115020W WO2020000864A1 WO 2020000864 A1 WO2020000864 A1 WO 2020000864A1 CN 2018115020 W CN2018115020 W CN 2018115020W WO 2020000864 A1 WO2020000864 A1 WO 2020000864A1
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Prior art keywords
trap
capacitor
signal
transformer
photovoltaic
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PCT/CN2018/115020
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French (fr)
Chinese (zh)
Inventor
张有清
姚华文
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江苏集能易新能源技术有限公司
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Publication of WO2020000864A1 publication Critical patent/WO2020000864A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Definitions

  • the invention relates to a PLC photovoltaic shutdown circuit, in particular to a DC voltage type PLC photovoltaic shutdown circuit, and belongs to the field of power electronic converters and communication technology.
  • the traditional wireless communication method requires a collector and an aggregator.
  • the collector is placed outdoors and the aggregator is placed indoors. 485 communication is required between them, which brings great installation and space problems.
  • Power Line Communication is a communication method that uses power line as a signal channel to transmit data.
  • the technology is to load the high-frequency signal carrying information to the current, and then use power lines to transmit it.
  • the modem that receives the information then separates the high-frequency from the current and transmits it to the monitoring center to realize the information transmission.
  • Power line carrier communication is a more intelligent communication scheme.
  • the use of this technology can save the trouble of RS485 communication cables and laying of photovoltaic inverters.
  • DC PLC photovoltaic system has the following advantages: 1 use the power line that has been laid for communication, no additional construction is needed to lay the communication line, so the total cost is low; 2 it is wired communication, so it has good stability and other advantages.
  • the technical problem to be solved by the present invention is to provide a DC voltage type PLC photovoltaic shutdown circuit, which can reduce the cost, improve the reliability, stability of the product, is easy to implement, and meets the fast shutdown requirements of US regulations.
  • a DC voltage type PLC photovoltaic shutdown circuit which includes: a photovoltaic module VPV, an input capacitor C4, a switching tube Q1, a freewheeling diode D1, and a first LC trap.
  • a capacitor, an output capacitor C5, a transformer T1, a coupling capacitor C6, a third LC trap, a signal filter resistor R1, a signal filter capacitor C7, and a second LC trap, and two ends of the output capacitor C5 are output terminals;
  • the input capacitor C4 is connected in parallel with the photovoltaic module VPV.
  • the positive pole of the photovoltaic module VPV is connected to the negative pole of the freewheeling diode D1, one end of the coupling capacitor C6 and one end of the output capacitor C5, and the negative pole of the photovoltaic module VPV is connected to a switching tube.
  • the drain of Q1 is connected, the source of the switching tube Q1 is connected to one end of the first LC trap, the primary end of the transformer T1 and the other end of the output capacitor C5 are connected, the first LC trap
  • the other end is connected to the anode of the free-wheeling diode D1, and the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6;
  • One end of the secondary side of the transformer T1 is connected to one end of a third LC trap, the other end of the third LC trap is connected to one end of a second LC trap, and the other end of the second LC trap is It is connected to one end of a signal filtering resistor R1, the other end of the signal filtering resistor R1 is connected to one end of a signal filtering capacitor C7, and the other end of the signal filtering capacitor C7 is connected to the other end of the secondary side of the transformer T1.
  • the first LC trap is a PLC signal frequency trap composed of L1 and C1, and the first LC trap is connected in series with a freewheeling diode D1.
  • the switch Q1 When the switch Q1 is turned off, the string current and the PLC signal pass through the freewheeling diode D1 to achieve normal power line carrier communication; when the switch Q1 is closed, the power line carrier communication is stopped, and the string current passes through the switch Q1.
  • the third LC trap is an interference frequency trap composed of L3 and C3, and the third LC trap is used to filter interference signals within 50K. .
  • the inductance value L3 of the third LC trap is 150uH, and the capacitance value C3 is 22nf to 68nf.
  • the DC voltage type PLC photovoltaic shutdown circuit provided by the present invention has the following advantages: (1) has a high signal anti-interference ability and stable signal communication; (2) PLC The signal frequency traps L1, C1 are connected in series with the freewheeling diode D1, which improves the efficiency of the system without affecting the stability of the system.
  • FIG. 1 is a schematic diagram of a DC voltage type PLC photovoltaic shutdown circuit in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of network connection of a plurality of DC voltage type PLC photovoltaic shutdown devices according to an embodiment of the present invention.
  • the DC voltage type PLC photovoltaic shutdown circuit in the embodiment of the present invention has high efficiency, does not affect the characteristics of the original system, has high reliability, and is simple to implement.
  • FIG. 1 is a schematic diagram of a DC voltage type PLC photovoltaic shutdown circuit according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of network connection of a plurality of DC voltage type PLC photovoltaic shutdown devices in an embodiment of the present invention.
  • a DC voltage type PLC photovoltaic shutdown circuit provided by the present invention, a photovoltaic module VPV, an input capacitor C4, a switch Q1, a freewheeling diode D1, a first LC trap, and an output capacitor C5, transformer T1, coupling capacitor C6, third LC notch L3, C3, signal filtering resistor R1, signal filtering capacitor C7, second LC notch L2, C2, output terminals 1-1 and 1-2;
  • the input capacitor C4 is connected in parallel with the photovoltaic module VPV.
  • the positive pole of the photovoltaic module VPV is connected to the negative pole of the freewheeling diode D1, one end of the coupling capacitor C6 and one end of the output capacitor C5, and the negative pole of the photovoltaic module VPV is connected to the drain of the switching transistor Q1.
  • the source of the switch Q1 is connected to one end of the first LC trap L1, C1, the primary end of the transformer T1 and the other end of the output capacitor C5, and the other end of the first LC trap L1, C1 Is connected to the anode of the free-wheeling diode D1, and the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6;
  • the output terminals 1-1 and 1-2 are connected in parallel with the output capacitor C5;
  • the other end of the first LC trap L1, C1 is connected to the anode of the freewheeling diode D1, the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6; the output terminals 1-1 and 1- 2 is connected in parallel with the output capacitor C5, one end of the secondary side of the transformer T1 is connected to one end of the third LC trap L3, C3, and the other end of the third LC trap L3, C3 is connected to the second LC trap L2, C2 One end is connected, the other end of the second LC trap L2, C2 is connected to the signal filter resistor R1, the other end of the signal filter resistor R1 is connected to the signal filter capacitor C7, and the other end of the signal filter capacitor C7 is connected to the other end of the secondary side of the transformer T1 .
  • the first LC trap is a PLC signal frequency trap composed of L1 and C1.
  • the first LC trap is connected in series with the free-wheeling diode D1.
  • the switch Q1 When the switch Q1 is turned off, the impedance of the freewheeling circuit can be greatly increased, so that the signal passes through the transformer T1, and the communication is normal.
  • the switch Q1 When the switch Q1 is closed, the current flows through Q1, which does not affect the efficiency of the system and the stability of the system.
  • the PLC signal frequency traps L1 and C1 are connected in series with the free-wheeling diode D1. Only when the circuit breaker does not work, the current passes through L1.
  • the inverter input Boost circuit and the inverter's switching tube will have a switching frequency of less than 50k, which will cause a voltage ripple of less than 50K on the input line, which will cause some interference to the PLC signal and cause a signal. Distortion and system instability.
  • the third LC notch is an interference frequency notch composed of L3 and C3.
  • the specific interference frequency traps L3 and C3 can filter the interference of the specific open-frequency signal brought by the rear inverter, which will not cause PLC signal distortion, communication packet loss, and improve system communication reliability.
  • the multiple circuit breakers of the present invention are connected end to end.
  • PLC signal has very strong anti-interference ability, stable signal communication and stable system.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Inverter Devices (AREA)

Abstract

A direct current voltage-type PLC photovoltaic shutdown device circuit, comprising a photovoltaic assembly VPV, an input capacitor C4, a switch transistor Q1, a flyback diode D1, a first LC trap filter, an output capacitor C5, a transformer T1, a coupling capacitor C6, a third LC trap filter, a signal filter resistor R1, a signal filter capacitor C7, and a second LC trap filter, wherein two ends of the output capacitor C5 are output terminals; when the switch transistor Q1 is disconnected, string current and a PLC signal traverse from the flyback diode D1, thereby implementing normal power line communication. When the switch transistor Q1 is closed, power line communication is stopped, and string current traverses from the switch transistor Q1 without affecting the efficiency and stability of the system.

Description

一种直流电压型PLC光伏关断器电路DC voltage type PLC photovoltaic shutdown circuit 技术领域Technical field
本发明涉及一种PLC光伏关断器电路，尤其涉及直流电压型PLC光伏关断器电路，属于电力电子变换器以及通信技术领域。The invention relates to a PLC photovoltaic shutdown circuit, in particular to a DC voltage type PLC photovoltaic shutdown circuit, and belongs to the field of power electronic converters and communication technology.
背景技术Background technique
传统的无线通信方式需要采集器和汇总器，采集器放置在室外，汇总器放置在室内，之间需要485通信，带来很大的安装及空间问题，其次，无线通信受干扰的因数比较多，相邻电站之间还必须采用不同的频段，频段与频段之间也会有干扰，导致丢包，影响通信的可靠性。The traditional wireless communication method requires a collector and an aggregator. The collector is placed outdoors and the aggregator is placed indoors. 485 communication is required between them, which brings great installation and space problems. Second, there are many factors that interfere with wireless communication. , Adjacent power stations must also use different frequency bands, and there will be interference between frequency bands, which will cause packet loss and affect communication reliability.
电力线载波通信技术（Power Line Communication，简称PLC）是利用电力线作为信号通道来传输数据的通信方式。该技术是把载有信息的高频信号加载于电流，然后用电力线传输，接收信息的调制解调器再把高频从电流中分离出来 ，并传送到监控中心，以实现信息传递。Power Line Communication (PLC) is a communication method that uses power line as a signal channel to transmit data. The technology is to load the high-frequency signal carrying information to the current, and then use power lines to transmit it. The modem that receives the information then separates the high-frequency from the current and transmits it to the monitoring center to realize the information transmission.
电力线载波通信是一种更智能的通信方案，采用这种技术可省去光伏逆变器RS485通信线缆及其敷设的困扰。直流PLC光伏系统，具有如下优点：①利用已经布设的电力线进行通信，无需另外施工布设通信线路，因此总成本较低；②属于有线通信，因此有稳定性好等优点。Power line carrier communication is a more intelligent communication scheme. The use of this technology can save the trouble of RS485 communication cables and laying of photovoltaic inverters. DC PLC photovoltaic system has the following advantages: ① use the power line that has been laid for communication, no additional construction is needed to lay the communication line, so the total cost is low; ② it is wired communication, so it has good stability and other advantages.
技术问题technical problem
本发明所要解决的技术问题是提供一种直流电压型PLC光伏关断器电路，可以降低成本，提高产品的可靠性，稳定性，易于实施，满足美国法规快速关断要求。The technical problem to be solved by the present invention is to provide a DC voltage type PLC photovoltaic shutdown circuit, which can reduce the cost, improve the reliability, stability of the product, is easy to implement, and meets the fast shutdown requirements of US regulations.
技术解决方案Technical solutions
本发明为解决上述技术问题而采用的技术方案是提供一种直流电压型PLC光伏关断器电路，包括：光伏组件VPV、输入电容C4、开关管Q1、续流二极管D1、第一LC陷波器、输出电容C5、变压器T1、耦合电容C6、第三LC陷波器、信号滤波电阻R1，信号滤波电容C7和第二LC陷波器，所述输出电容C5的两端为输出端子；The technical solution adopted by the present invention to solve the above technical problems is to provide a DC voltage type PLC photovoltaic shutdown circuit, which includes: a photovoltaic module VPV, an input capacitor C4, a switching tube Q1, a freewheeling diode D1, and a first LC trap. A capacitor, an output capacitor C5, a transformer T1, a coupling capacitor C6, a third LC trap, a signal filter resistor R1, a signal filter capacitor C7, and a second LC trap, and two ends of the output capacitor C5 are output terminals;
所述输入电容C4与光伏组件VPV并联连接，所述光伏组件VPV的正极与续流二极管D1的负极，耦合电容C6的一端以及输出电容C5的一端相连，所述光伏组件VPV的负极与开关管Q1的漏极相连，所述开关管Q1的源极与第一LC陷波器的一端相连，所述变压器T1的原边一端以及输出电容C5的另外一端相连，所述第一LC陷波器的另一端与续流二极管D1阳极相连，所述变压器T1原边的另外一端与耦合电容C6的另外一端相连；The input capacitor C4 is connected in parallel with the photovoltaic module VPV. The positive pole of the photovoltaic module VPV is connected to the negative pole of the freewheeling diode D1, one end of the coupling capacitor C6 and one end of the output capacitor C5, and the negative pole of the photovoltaic module VPV is connected to a switching tube. The drain of Q1 is connected, the source of the switching tube Q1 is connected to one end of the first LC trap, the primary end of the transformer T1 and the other end of the output capacitor C5 are connected, the first LC trap The other end is connected to the anode of the free-wheeling diode D1, and the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6;
所述变压器T1副边一端与第三LC陷波器的一端相连，所述第三LC陷波器的另外一端与第二LC陷波器的一端相连，所述第二LC陷波器另外一端与信号滤波电阻R1的一端相连，所述信号滤波电阻R1另外一端与信号滤波电容C7的一端相连，所述信号滤波电容C7的另外一端与变压器T1副边的另外一端相连。One end of the secondary side of the transformer T1 is connected to one end of a third LC trap, the other end of the third LC trap is connected to one end of a second LC trap, and the other end of the second LC trap is It is connected to one end of a signal filtering resistor R1, the other end of the signal filtering resistor R1 is connected to one end of a signal filtering capacitor C7, and the other end of the signal filtering capacitor C7 is connected to the other end of the secondary side of the transformer T1.
上述的直流电压型PLC光伏关断器电路，其中，所述第一LC陷波器为由L1,C1组成的PLC信号频率陷波器，所述第一LC陷波器与续流二极管D1串联，当开关管Q1断开时，组串电流和PLC信号从续流二极管D1通过,实现正常电力线载波通信；当开关管Q1闭合时，停止电力线载波通信，组串电流从开关管Q1通过。In the DC voltage type PLC photovoltaic shutdown circuit described above, the first LC trap is a PLC signal frequency trap composed of L1 and C1, and the first LC trap is connected in series with a freewheeling diode D1. When the switch Q1 is turned off, the string current and the PLC signal pass through the freewheeling diode D1 to achieve normal power line carrier communication; when the switch Q1 is closed, the power line carrier communication is stopped, and the string current passes through the switch Q1.
上述的直流电压型PLC光伏关断器电路，其中，所述第三LC陷波器为由L3,C3组成的干扰频率陷波器，所述第三LC陷波器用于过滤50K以内的干扰信号。In the DC voltage type PLC photovoltaic shutdown circuit described above, the third LC trap is an interference frequency trap composed of L3 and C3, and the third LC trap is used to filter interference signals within 50K. .
上述的直流电压型PLC光伏关断器电路，其中，所述第三LC陷波器的电感值L3为150uH，电容值C3为22nf～68nf。In the DC voltage type PLC photovoltaic shutdown circuit described above, the inductance value L3 of the third LC trap is 150uH, and the capacitance value C3 is 22nf to 68nf.
有益效果Beneficial effect
本发明对比现有技术有如下的有益效果：本发明提供的直流电压型PLC光伏关断器电路，具有以下优点：(1) 具有很高的信号抗干扰能力，信号通信稳定；(2) PLC信号频率陷波器L1,C1与续流二极管D1串联，提高系统的效率，又不影响系统的稳定性。Compared with the prior art, the present invention has the following beneficial effects: The DC voltage type PLC photovoltaic shutdown circuit provided by the present invention has the following advantages: (1) has a high signal anti-interference ability and stable signal communication; (2) PLC The signal frequency traps L1, C1 are connected in series with the freewheeling diode D1, which improves the efficiency of the system without affecting the stability of the system.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本发明实施例中的一种直流电压型PLC光伏关断器电路示意图；1 is a schematic diagram of a DC voltage type PLC photovoltaic shutdown circuit in an embodiment of the present invention;
图2是本发明实施例中的多个直流电压型PLC光伏关断器组网连接示意图。FIG. 2 is a schematic diagram of network connection of a plurality of DC voltage type PLC photovoltaic shutdown devices according to an embodiment of the present invention.
本发明的实施方式Embodiments of the invention
本发明实施例中的一种直流电压型PLC光伏关断器电路，效率高，不影响原有系统的特性，可靠性高，实施简单。The DC voltage type PLC photovoltaic shutdown circuit in the embodiment of the present invention has high efficiency, does not affect the characteristics of the original system, has high reliability, and is simple to implement.
为使本发明的上述目的、特征和有益效果能够更为明显易懂，下面结合附图对本发明的具体实例做详细的说明。In order to make the foregoing objects, features, and beneficial effects of the present invention more comprehensible, specific examples of the present invention will be described in detail below with reference to the accompanying drawings.
图1是本发明实施例中的一种直流电压型PLC光伏关断器电路示意图；图2是本发明实施例中的多个直流电压型PLC光伏关断器组网连接示意图。FIG. 1 is a schematic diagram of a DC voltage type PLC photovoltaic shutdown circuit according to an embodiment of the present invention; FIG. 2 is a schematic diagram of network connection of a plurality of DC voltage type PLC photovoltaic shutdown devices in an embodiment of the present invention.
请参考图1和图2，本发明提供的一种直流电压型PLC光伏关断器电路，光伏组件VPV、输入电容C4、开关管Q1、续流二极管D1、第一LC陷波器、输出电容C5、变压器T1、耦合电容C6、第三LC陷波器L3,C3、信号滤波电阻R1、信号滤波电容C7、第二LC陷波器L2,C2，输出端子1-1和1-2；Please refer to FIG. 1 and FIG. 2, a DC voltage type PLC photovoltaic shutdown circuit provided by the present invention, a photovoltaic module VPV, an input capacitor C4, a switch Q1, a freewheeling diode D1, a first LC trap, and an output capacitor C5, transformer T1, coupling capacitor C6, third LC notch L3, C3, signal filtering resistor R1, signal filtering capacitor C7, second LC notch L2, C2, output terminals 1-1 and 1-2;
所述输入电容C4与光伏组件VPV并联连接，光伏组件VPV的正极与续流二极管D1的负极，耦合电容C6的一端以及输出电容C5的一端相连，光伏组件VPV的负极与开关管Q1的漏极相连，开关管Q1的源极与第一LC陷波器L1,C1一端相连，变压器T1的原边一端以及输出电容C5的另外一端相连，所述第一LC陷波器L1,C1的另一端与续流二极管D1阳极相连，所述变压器T1原边的另外一端与耦合电容C6的另外一端相连；The input capacitor C4 is connected in parallel with the photovoltaic module VPV. The positive pole of the photovoltaic module VPV is connected to the negative pole of the freewheeling diode D1, one end of the coupling capacitor C6 and one end of the output capacitor C5, and the negative pole of the photovoltaic module VPV is connected to the drain of the switching transistor Q1. Connected, the source of the switch Q1 is connected to one end of the first LC trap L1, C1, the primary end of the transformer T1 and the other end of the output capacitor C5, and the other end of the first LC trap L1, C1 Is connected to the anode of the free-wheeling diode D1, and the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6;
所述输出端子1-1和1-2与输出电容C5并联；The output terminals 1-1 and 1-2 are connected in parallel with the output capacitor C5;
所述第一LC陷波器L1,C1的另一端与续流二极管D1阳极相连，所述变压器T1原边的另外一端与耦合电容C6的另外一端相连；所述输出端子1-1和1-2与输出电容C5并联，所述变压器T1副边一端与第三LC陷波器L3,C3一端相连，第三LC陷波器L3,C3的另外一端与第二LC陷波器L2,C2的一端相连，第二LC陷波器L2,C2另外一端与信号滤波电阻R1相连，信号滤波电阻R1另外一端与信号滤波电容C7相连，信号滤波电容C7的另外一端与变压器T1副边的另外一端相连。The other end of the first LC trap L1, C1 is connected to the anode of the freewheeling diode D1, the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6; the output terminals 1-1 and 1- 2 is connected in parallel with the output capacitor C5, one end of the secondary side of the transformer T1 is connected to one end of the third LC trap L3, C3, and the other end of the third LC trap L3, C3 is connected to the second LC trap L2, C2 One end is connected, the other end of the second LC trap L2, C2 is connected to the signal filter resistor R1, the other end of the signal filter resistor R1 is connected to the signal filter capacitor C7, and the other end of the signal filter capacitor C7 is connected to the other end of the secondary side of the transformer T1 .
本发明提供的直流电压型PLC光伏关断器电路，第一LC陷波器为由L1,C1组成的PLC信号频率陷波器，所述第一LC陷波器与续流二极管D1串联，当开关管Q1断开时，可以很大地提高续流回路的阻抗，使信号从变压器T1通过，通信正常，当开关管Q1闭合时，电流从Q1流过，不影响系统的效率以及系统的稳定性。其中，PLC信号频率陷波器L1,C1与续流二极管D1串联，仅当关断器不工作时，电流才从L1通过，当关断器工作时，电流仅从Q1通过，相当于光伏组件直接输出，关断器效率高，这样的关断器系统与纯光伏系统一样，不会影响到系统的原有特性，不会造成逆变器后级逆变器工作震荡。In the DC voltage type PLC photovoltaic shutdown circuit provided by the present invention, the first LC trap is a PLC signal frequency trap composed of L1 and C1. The first LC trap is connected in series with the free-wheeling diode D1. When the switch Q1 is turned off, the impedance of the freewheeling circuit can be greatly increased, so that the signal passes through the transformer T1, and the communication is normal. When the switch Q1 is closed, the current flows through Q1, which does not affect the efficiency of the system and the stability of the system. . Among them, the PLC signal frequency traps L1 and C1 are connected in series with the free-wheeling diode D1. Only when the circuit breaker does not work, the current passes through L1. When the circuit breaker works, the current only passes through Q1, which is equivalent to photovoltaic modules. Direct output, high efficiency of the breaker. Such a breaker system, like a pure photovoltaic system, will not affect the original characteristics of the system, and will not cause the post-inverter inverter to oscillate.
另外逆变器输入Boost电路和逆变器电路的开关管会有50k以内的开关频率工作，这会造成输入线上会有50K以内的电压纹波，会对PLC信号产生一定的干扰，造成信号失真，系统不稳定。所述第三LC陷波器为由L3,C3组成的干扰频率陷波器，第三LC陷波器L3,C3通过配置参数(如L3=150uH,C3=22nf～68nf)；能完美滤除50K以内的信号。特定干扰频率陷波器L3,C3能滤除后级逆变器带来的特定开光频率信号的干扰，不会造成PLC 信号失真，通信丢包，提高系统通信的可靠性。In addition, the inverter input Boost circuit and the inverter's switching tube will have a switching frequency of less than 50k, which will cause a voltage ripple of less than 50K on the input line, which will cause some interference to the PLC signal and cause a signal. Distortion and system instability. The third LC notch is an interference frequency notch composed of L3 and C3. The third LC notch L3 and C3 pass the configuration parameters (such as L3 = 150uH, C3 = 22nf ～ 68nf); it can be perfectly filtered Signals within 50K. The specific interference frequency traps L3 and C3 can filter the interference of the specific open-frequency signal brought by the rear inverter, which will not cause PLC signal distortion, communication packet loss, and improve system communication reliability.
请继续参见图2，本发明的多个关断器之间首尾相连，一串最多个数小于30个，由于后级逆变器输入有大电容，高频阻抗非常低，导致PLC信号失真，所以PCL信号发生器与逆变器输入之间需要接第四LC陷波器,其截止频率为135K,LC参数为L=20uH,C=68nf，第四陷波器的作用是滤除后级逆变器带来的与PLC信号相同频率的干扰信号,同时使PLC信号系统是高阻抗状态,防止系统因为阻抗低,信号失真。Please continue to refer to FIG. 2. The multiple circuit breakers of the present invention are connected end to end. The maximum number of a string is less than 30. Due to the large capacitance at the input of the rear inverter, the high-frequency impedance is very low, which causes the PLC signal to be distorted. Therefore, a fourth LC trap needs to be connected between the PCL signal generator and the inverter input. Its cut-off frequency is 135K, and the LC parameters are L = 20uH and C = 68nf. The function of the fourth trap is to filter out the subsequent stage. The interference signal brought by the inverter with the same frequency as the PLC signal, while making the PLC signal system in a high impedance state, preventing the system from being distorted due to the low impedance.
本发明提供的直流电压型PLC光伏关断器电路，具有以下优点：The DC voltage type PLC photovoltaic shutdown circuit provided by the present invention has the following advantages:
(1) 效率高，不影响原有系统的特性，可靠性高；(1) High efficiency, without affecting the characteristics of the original system, and high reliability;
(2) PLC信号抗干扰能力非常强，信号通信稳定，系统稳定。(2) PLC signal has very strong anti-interference ability, stable signal communication and stable system.
虽然本发明已以较佳实施例揭示如上，然其并非用以限定本发明，任何本领域技术人员，在不脱离本发明的精神和范围内，当可作些许的修改和完善，因此本发明的保护范围当以权利要求书所界定的为准。Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. The scope of protection shall be as defined in the claims.

Claims (4)

  1. 一种直流电压型PLC光伏关断器电路，其特征在于，包括：A DC voltage type PLC photovoltaic shutdown circuit is characterized in that it includes:
    光伏组件VPV、输入电容C4、开关管Q1、续流二极管D1、第一LC陷波器、输出电容C5、变压器T1、耦合电容C6、第三LC陷波器、信号滤波电阻R1，信号滤波电容C7和第二LC陷波器，所述输出电容C5的两端为输出端子；Photovoltaic module VPV, input capacitor C4, switch Q1, freewheeling diode D1, first LC trap, output capacitor C5, transformer T1, coupling capacitor C6, third LC trap, signal filter resistor R1, signal filter capacitor C7 and a second LC trap, and two ends of the output capacitor C5 are output terminals;
    所述输入电容C4与光伏组件VPV并联连接，所述光伏组件VPV的正极与续流二极管D1的负极，耦合电容C6的一端以及输出电容C5的一端相连，所述光伏组件VPV的负极与开关管Q1的漏极相连，所述开关管Q1的源极与第一LC陷波器的一端相连，所述变压器T1的原边一端以及输出电容C5的另外一端相连，所述第一LC陷波器的另一端与续流二极管D1阳极相连，所述变压器T1原边的另外一端与耦合电容C6的另外一端相连；The input capacitor C4 is connected in parallel with the photovoltaic module VPV. The positive pole of the photovoltaic module VPV is connected to the negative pole of the freewheeling diode D1, one end of the coupling capacitor C6 and one end of the output capacitor C5, and the negative pole of the photovoltaic module VPV is connected to a switching tube. The drain of Q1 is connected, the source of the switching tube Q1 is connected to one end of the first LC trap, the primary end of the transformer T1 and the other end of the output capacitor C5 are connected, the first LC trap The other end is connected to the anode of the free-wheeling diode D1, and the other end of the primary side of the transformer T1 is connected to the other end of the coupling capacitor C6;
    所述变压器T1副边一端与第三LC陷波器的一端相连，所述第三LC陷波器的另外一端与第二LC陷波器的一端相连，所述第二LC陷波器另外一端与信号滤波电阻R1的一端相连，所述信号滤波电阻R1另外一端与信号滤波电容C7的一端相连，所述信号滤波电容C7的另外一端与变压器T1副边的另外一端相连。One end of the secondary side of the transformer T1 is connected to one end of a third LC trap, the other end of the third LC trap is connected to one end of a second LC trap, and the other end of the second LC trap is It is connected to one end of a signal filtering resistor R1, the other end of the signal filtering resistor R1 is connected to one end of a signal filtering capacitor C7, and the other end of the signal filtering capacitor C7 is connected to the other end of the secondary side of the transformer T1.
  2. 根据权利要求1所述的直流电压型PLC光伏关断器电路，其特征在于，所述第一LC陷波器为由L1,C1组成的PLC信号频率陷波器，所述第一LC陷波器与续流二极管D1串联，当开关管Q1断开时，组串电流和PLC信号从续流二极管D1通过,实现正常电力线载波通信；当开关管Q1闭合时，停止电力线载波通信，组串电流从开关管Q1通过。The DC voltage type PLC photovoltaic shutdown circuit according to claim 1, wherein the first LC notch is a PLC signal frequency notch composed of L1, C1, and the first LC notch When the switch Q1 is turned off, the string current and the PLC signal pass through the freewheeling diode D1 to achieve normal power line carrier communication. When the switch Q1 is closed, the power line carrier communication is stopped and the string current is passed. Pass from switch Q1.
  3. 根据权利要求1所述的直流电压型PLC光伏关断器电路，其特征在于，所述第三LC陷波器为由L3,C3组成的干扰频率陷波器，所述第三LC陷波器用于过滤50K以内的干扰信号。The DC voltage type PLC photovoltaic shutdown circuit according to claim 1, wherein the third LC trap is an interference frequency trap composed of L3 and C3, and the third LC trap is used for To filter interference signals within 50K.
  4. 根据权利要求3所述的直流电压型PLC光伏关断器电路，其特征在于，所述第三LC陷波器的电感值L3为150uH，电容值C3为22nf～68nf。The DC voltage type PLC photovoltaic shutdown circuit according to claim 3, wherein an inductance L3 of the third LC trap is 150uH, and a capacitance C3 is 22nf to 68nf.
PCT/CN2018/115020 2018-06-29 2018-11-12 Direct current voltage-type plc photovoltaic shutdown device circuit WO2020000864A1 (en)

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