Photovoltaic rapid turn-off device and photovoltaic system

Abstract

The present invention discloses a photovoltaic rapid turn-off device and a photovoltaic system. The device comprises a first switch, a second switch, a bypass diode, an auxiliary source, a control circuit and a communication circuit. One of the photovoltaic assemblies is taken as a power supply photovoltaic assembly, and the output end of the power supply photovoltaic assembly is connected with the input end of the auxiliary source; the first switch is connected in series between the power supply photovoltaic assembly and a photovoltaic assembly adjacent to the power supply photovoltaic assembly; two ends of the second switch are respectively connected with the output anode and the output cathode after the photovoltaic assemblies are connected in series; the cathode of the bypass diode is connected with the low-voltage end of the photovoltaic assembly adjacent to the power supply photovoltaic assembly, and the anode of the bypass diode is connected with the low-voltage end of the power supply photovoltaic assembly; the communication circuit is configured to receive the turn-off instruction sent by the outside and send the turn-off instruction to the control circuit; and the control circuit is configured to control the disconnection of the first switch and the connection of the second switch when receiving the turn-off instruction. The photovoltaic rapid turn-off device and the photovoltaic system can reduce the cost, decrease the energy consumption and improve the generating efficiency.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic rapid shutdown device and a photovoltaic system. Background technique [0002] As a renewable energy generation technology, photovoltaic power generation technology has been widely used at home and abroad. The photovoltaic array outputs direct current, which is converted into alternating current by the inverter, and clean energy is transmitted to the grid. However, with the continuous expansion of the photovoltaic industry, the probability of accidents is also increasing. [0003] The photovoltaic arrays connected in series have a high voltage, so in order to improve the safety of the photovoltaic system, Chapter 690.12 of NEC2017 (American Electrician Act 2017) puts forward the requirements for rapid shutdown (RS, Rapid Shutdown) of the photovoltaic system, requiring the photovoltaic After the protection is broken, the voltage between any co...

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Problems solved by technology

[0006] For the protection method of connecting the components to the quick shutdown device, each photovoltaic module must be connected to a quick shutdown device, which is costly. In addition, during normal power generation, the switches of multiple quick shutdown devices in a photovoltaic string will Form a series relationship, resulting in large conduction loss, affecting power generation efficiency

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