WO2019148483A1 - Système d'arrêt destiné à un réseau d'ensembles photovoltaïques - Google Patents

Système d'arrêt destiné à un réseau d'ensembles photovoltaïques Download PDF

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Publication number
WO2019148483A1
WO2019148483A1 PCT/CN2018/075227 CN2018075227W WO2019148483A1 WO 2019148483 A1 WO2019148483 A1 WO 2019148483A1 CN 2018075227 W CN2018075227 W CN 2018075227W WO 2019148483 A1 WO2019148483 A1 WO 2019148483A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
shutdown
transistor
photovoltaic module
terminal
Prior art date
Application number
PCT/CN2018/075227
Other languages
English (en)
Chinese (zh)
Inventor
周民
王忆诞
许琦彦
张为
Original Assignee
苏州谐通光伏科技股份有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 苏州谐通光伏科技股份有限公司 filed Critical 苏州谐通光伏科技股份有限公司
Priority to PCT/CN2018/075227 priority Critical patent/WO2019148483A1/fr
Priority to CN201880000852.7A priority patent/CN109075738A/zh
Publication of WO2019148483A1 publication Critical patent/WO2019148483A1/fr

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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
    • 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

Definitions

  • the present invention relates to a photovoltaic module array shutdown system.
  • a photovoltaic cell is a device that directly converts solar radiation energy into electrical energy.
  • a photovoltaic component is a product that is connected and packaged by a plurality of photovoltaic cells, and is a basic unit of a battery array in a photovoltaic power generation system. When the PV module array fails, the grid needs to be turned off. However, the PV module is a power generation system. Each series unit has a high voltage, which poses a safety hazard to maintenance personnel. Therefore, it is necessary to provide a fast and intelligent shutdown system. It can automatically realize the fast and safe shutdown of each component in the system to ensure the safety of personnel.
  • the present invention provides a photovoltaic module array shutdown system for performing shutdown control of a photovoltaic module array, including a shutdown controller and a plurality of shutdown devices, the shutdown device having a first a connecting end and a second connecting end, wherein the shut-off device is connected in series with the photovoltaic module through the first connecting end between the DC bus bars, and each of the shut-off devices is located between adjacent photovoltaic components, the The breaking device is connected in series with the shutdown controller through the second connection end, and the shutdown controller controls the related breaking device in the circuit to be simultaneously turned on or off under the preset condition to control the connection or disconnection of the photovoltaic module circuit. .
  • the shut-off device includes an interconnecting main control unit, a controlled unit, a power supply unit, and an interconnecting switch unit, wherein the interconnecting main control unit has a first connecting end, and the mutual The main control unit generates a main control signal under the action of the shutdown controller, the power supply unit is connected to the controlled unit, and the controlled unit generates a controlled signal under the action of the main control signal.
  • the interconnecting switch unit has a second connecting end, and the interconnecting switching unit is connected or disconnected by the controlled signal.
  • control connection is realized by the optocoupler switch between the interconnecting main control unit and the controlled unit, and the optocoupler switch comprises a light emitting diode D and a photo-controlled phototransistor T.
  • the interconnect switch unit comprises a MOS FET, The gate of the MOS FET is connected to the controlled unit.
  • the controlled unit comprises:
  • the resistor R1 is connected to the collector of the phototransistor T;
  • the complementary push-pull circuit is connected to the power supply unit, and the complementary push-pull circuit comprises a transistor T2, a resistor R3, a transistor T3 and a resistor R4.
  • One of the transistor T2 and the transistor T3 is an NPN transistor and the other is a PNP type.
  • the triode, the triode T2, the base of the triode T3 are connected, the collectors are connected in parallel, the emitter is connected in parallel to the gate of the MOS field effect transistor to output a controlled signal, the resistor R3 is connected to the emitter of the triode T2, and the resistor R4 is connected.
  • the transistor T1 and the resistor R2 are connected to the power supply unit.
  • the base of the transistor T1 is connected to the collector of the phototransistor T, and the collector of the transistor T1 is connected to the base of the transistor T2 and the transistor T3.
  • the power supply unit includes a power take-off input unit, a DC/DC converter, and a regulated output unit, and the power take-off input unit is connected to an output end of the photovoltaic module, and the regulated output is A unit is coupled to the controlled unit.
  • the DC/DC converter has a VIN terminal, an EN terminal, a SW terminal, an FB terminal, a CB terminal, and a GND terminal
  • the power take-off input unit includes an anti-connection connected to the VIN terminal and the EN terminal.
  • the regulated output unit comprises a storage inductor L1 connected to the SW end, a sampling resistor R11, a sampling resistor R12, a freewheeling diode D2, a filter capacitor C4, a filter capacitor C5, and the FB terminal is connected to the sampling.
  • a bias capacitor C1 is connected between the resistor R1 and the sampling resistor R2 between the CB terminal and the SW terminal.
  • shut-off devices are arranged one inside the other within the photovoltaic module.
  • the present invention can automatically realize fast and safe shutdown of each component in the system to ensure personnel safety.
  • Embodiment 1 is a skeleton diagram of Embodiment 1 of a photovoltaic module array shutdown system of the present invention
  • FIG. 2 is a circuit diagram of a photovoltaic module array shutdown system of the present invention
  • FIG. 3 is a circuit diagram of a power supply unit of a photovoltaic module array shutdown system of the present invention
  • FIG. 4 is a block diagram of a second embodiment of a photovoltaic module array shutdown system of the present invention.
  • FIG. 1 is a block diagram of a first embodiment of a photovoltaic module array shutdown system of the present invention for shutting down a photovoltaic module array, including a shutdown controller and a plurality of independent shutdown devices, a shutdown device The first connecting end and the second connecting end are provided, the shut-off device is connected in series with the photovoltaic module through the first connecting end between the DC bus bars, the positive and negative terminals are DC bus bars, connected to the inverter, and each shut-off device is located at the phase Between the adjacent photovoltaic modules, the shutdown device is connected in series with the shutdown controller through the second connection end, the shutdown system is a device that turns off the photovoltaic cell assembly string by the shutdown controller, and the shutdown controller is a control shutdown device. The circuit is turned on and off, and the shutdown controller is operated as needed. The shutdown controller is turned on or off at the same time to control the connection or disconnection of the photovoltaic module circuit under the preset condition.
  • the shutdown device comprises an interconnection main control unit, a controlled unit, a power supply unit, and an interconnection switch unit, and the interconnection main control unit has a first connection end, and the interconnection main control unit generates a main control under the action of the shutdown controller
  • the signal is connected to the controlled unit, and the controlled unit generates a controlled signal under the action of the main control signal.
  • the interconnecting switch unit has a second connecting end, and the interconnecting switching unit is connected or disconnected under the action of the controlled signal.
  • FIG. 2 is a circuit diagram of a photovoltaic module array shutdown system of the present invention.
  • Z1 is connected to the former PV module, and Z2 is connected to the PV module.
  • the control connection is realized by the photoelectric coupling switch between the interconnecting main control unit and the controlled unit.
  • the photoelectric coupling switch comprises an LED D and a photo-controlled phototransistor T, D and T form an optocoupler for transmitting signals and isolating Since the input impedance of the photocoupler is small, even if the amplitude of the interference voltage is large, the noise voltage fed back to the input end of the photocoupler is small, and only a very weak current can be formed, thereby being suppressed.
  • the optocoupler can play a good role in safety. Even when the external device fails, even if the input signal is shorted, the component will not be damaged, because the input and output loops of the optocoupler can withstand several High voltage of kilovolts. Finally, the optocoupler has a very fast response speed and a response delay time of only about 10 ⁇ s, which is suitable for the case where the response speed is high in the present invention.
  • K1 is connected to the previous interconnect switch unit
  • K2 is connected to the next interconnect switch unit
  • the interconnect switch unit includes a MOS FET.
  • the gate of the MOS FET is connected to the controlled unit.
  • the controlled unit includes: a phototransistor T connected to the power supply unit and a resistor R1, the resistor R1 is connected to the collector of the phototransistor T; a complementary push-pull circuit connected to the power supply unit, and the complementary push-pull circuit includes a triode T2, a resistor R3, and a triode T3 and resistor R4, transistor T2, transistor T3 one is NPN type transistor, the other is PNP type transistor, transistor T2, transistor T3 base is connected, collector is connected in parallel, and the emitter is connected in parallel to the gate of MOS field effect transistor To output the controlled signal, the resistor R3 is connected to the emitter of the transistor T2, the resistor R4 is connected to the emitter of the transistor T3; the transistor T1 and the resistor R2 are connected to the power supply unit, and the base of the transistor T1 is connected to the collector of the phototransistor T The collector of the transistor T1 is
  • Complementary' is the use of two different polarity triodes, using different polarity of the input polarity of different transistors, using a signal to excite two different polarity triodes, one is the NPN type triode, the other is the PNP type triode,
  • the bases of the two transistors are connected, and an input signal is applied to the base of the two tubes as a push signal.
  • the base and emitter of the two tubes are connected in parallel. Due to the different polarities of the two transistors, the input signal voltage on the base is forward biased to the two tubes, and one is reverse biased. When there is an input signal, the voltage of the base of the two tubes rises at the same time.
  • the input signal voltage adds a forward bias voltage to one tube, so the tube enters the conduction and amplification states. Since the base voltage rises and a reverse bias voltage is applied to the other tube, the tube is in an off state. When there is no input signal, the base voltages of the two tubes drop at the same time, and the other tube is forward biased, so that the tube enters the conduction and amplification states, and one tube enters the cut-off state again.
  • the working principle of the fast shutdown circuit of the invention when the photovoltaic system needs to be connected, the control signal flows from K1 to K2, D emits light, T turns on, T1 cuts off, R2 lower end high level, T2 turns on T3 cutoff, T4 gate Extremely high, T4 is on and the PV system is on.
  • the signal between K1K2 is cut off, D does not emit light, T is turned off, T1 is saturated, the lower end of R2 is low level, T2 is turned off T3 is turned on, the gate of T4 is low level, T4 is cut off, The photovoltaic system is disconnected.
  • the power supply unit includes a power take-off input unit, a DC/DC converter, and a regulated output unit, and the power take-off unit is connected to an output end of the photovoltaic module.
  • the regulated output unit is connected to the controlled unit.
  • the DC/DC converter uses a DC/DC chip.
  • the DC/DC chip is a current mode step-down converter with a wide input voltage range of 4.5V ⁇ . 52V for a variety of applications, Adjust the unstable power supply to a fixed, stable output.
  • the built-in low-resistance 0.9 ⁇ switch makes the IC 85% good operating efficiency, plus the advantage of effectively reducing the surface temperature of the chip.
  • the chip has a VIN terminal, an EN terminal, a SW terminal, an FB terminal, a CB terminal, and a GND terminal.
  • VIN and GND are input terminals of the power supply, and power is taken from the photovoltaic component.
  • the power take-off input unit includes a reverse-proof diode D1, a filter capacitor C2, and a filter capacitor C3 connected to the VIN terminal and the EN terminal.
  • V, GND is the output end of the power supply, which supplies power to the photovoltaic fast shutdown circuit.
  • the regulated output unit includes a storage inductor L1 connected to the SW end, a sampling resistor R11, a sampling resistor R12, a freewheeling diode D2, a filter capacitor C4, and a filter capacitor C5.
  • the FB terminal is connected between the sampling resistor R1 and the sampling resistor R2, CB.
  • a bias capacitor C1 is connected between the terminal and the SW terminal.
  • This circuit takes power from the PV module by VIN and GND, and is decoupled by C1 and C3 after D1 anti-connection, U1 for DC/DC conversion, L1 for D1 free-flow, C4 and C5 for filtering, by R1 R2 samples are fed back to U1 to obtain the stable voltage required by the subsequent circuits.
  • FIG. 4 is a frame diagram of a second embodiment of a photovoltaic module array shutdown system of the present invention.
  • the photovoltaic module junction box shutoff device in this embodiment is similar to that in the first embodiment, except that the shutdown device in the present embodiment
  • the one-to-one correspondence is arranged inside the photovoltaic module, and specifically, it can be integrated with the photovoltaic component junction box, and exists as a separate unit of the photovoltaic component junction box, so that the installation is simpler, so the utility model automatically realizes each in the system. Quick and safe shutdown of components to ensure personnel safety.

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  • Photovoltaic Devices (AREA)
  • Power Conversion In General (AREA)

Abstract

L'invention concerne un système d'arrêt pour un réseau d'ensembles photovoltaïques, pour effectuer une commande d'arrêt sur un réseau d'ensembles photovoltaïques. Le système comprend un dispositif de commande d'arrêt et une pluralité de dispositifs d'arrêt. Les dispositifs d'arrêt comprennent chacun une première borne de connexion et une seconde borne de connexion. Les dispositifs d'arrêt et les ensembles photovoltaïques sont connectés en série au moyen des premières bornes de connexion entre un bus à courant continu. Chacun des dispositifs d'arrêt est situé entre des ensembles photovoltaïques adjacents. Les dispositifs d'arrêt et le dispositif de commande d'arrêt sont connectés en série au moyen des secondes bornes de connexion. Le dispositif de commande d'arrêt contrôle tous les dispositifs d'arrêt dans un circuit de commande pour allumer ou arrêter simultanément ceux-ci dans une condition prédéterminée, de telle sorte qu'un circuit d'ensembles photovoltaïques est connecté ou déconnecté. Le système d'arrêt réalise un arrêt automatique, rapide et sûr de chaque ensemble dans un système, garantissant ainsi la sécurité du personnel de maintenance.
PCT/CN2018/075227 2018-02-05 2018-02-05 Système d'arrêt destiné à un réseau d'ensembles photovoltaïques WO2019148483A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2018/075227 WO2019148483A1 (fr) 2018-02-05 2018-02-05 Système d'arrêt destiné à un réseau d'ensembles photovoltaïques
CN201880000852.7A CN109075738A (zh) 2018-02-05 2018-02-05 光伏组件阵列关断系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/075227 WO2019148483A1 (fr) 2018-02-05 2018-02-05 Système d'arrêt destiné à un réseau d'ensembles photovoltaïques

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150381108A1 (en) * 2013-02-11 2015-12-31 Phoenix Contact Gmbh & Co. Kg Safe Photovoltaic System
CN106981881A (zh) * 2016-01-18 2017-07-25 台达电子企业管理（上海）有限公司 一种光伏发电系统及其快速关断方法
CN106602998A (zh) * 2017-02-28 2017-04-26 阳光电源股份有限公司 一种指令发送装置及光伏组件关断系统
CN206775459U (zh) * 2017-02-28 2017-12-19 阳光电源股份有限公司 一种光伏组件的关断装置及光伏组件关断系统
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