Photovoltaic power generation system and fast switching off method thereof

Abstract

The invention discloses a photovoltaic power generation system and a fast switching off method thereof. The photovoltaic power generation system includes a photovoltaic array panel unit, a junction box and an inverter. The photovoltaic array panel unit includes a photovoltaic array panel and a switching off apparatus. The switching off apparatus is in electrical connection to the photovoltaic array panel and is connected to the inverter through high voltage power transmission lines. The photovoltaic power generation system also includes a switching off apparatus controller which is coupled to the high voltage power transmission lines and is intended for receiving a first detection signal which reflects the state of the AC side of the inverter, determining whether the AC side of the inverter is powered off on the basis of the first detection signal, outputting a first power off signal when the AC side of the inverter is powered off, and transmitting the first power off signal to the photovoltaic array panel unit through the high voltage power transmission lines. The switching off apparatus of the photovoltaic array panel unit is intended for receiving the first power off signal and forbidding electricity transmission to the inverter on the basis of the first power off signal. According to the invention, the method herein lowers the difficulty of installing a photovoltaic power generation system and the complexity.

Description

technical field [0001] The invention belongs to the field of solar photovoltaic power generation, and in particular relates to a photovoltaic power generation system and a fast shutdown method thereof. Background technique [0002] As a clean and renewable energy source, solar energy is a renewable power generation method with zero pollution, and its technology has been widely used at home and abroad. Photovoltaic power generation systems include off-grid and grid-connected, and grid-connected photovoltaic power generation systems mainly include photovoltaic arrays, junction boxes, and inverters. In the grid-connected photovoltaic power generation system, the photovoltaic array converts the received solar energy into DC power, and the inverter converts the DC power into the required AC power, which is incorporated into the grid or directly supplied to customers. However, due to the high voltage and energy of the photovoltaic array itself, it is necessary to disconnect these...

AI Technical Summary

Problems solved by technology

The method of directly laying a lead wire to connect the inverter and the quick shutdown device can only realize the unilateral shutdown of the quick shutdown device when there is a fault on the grid side, and cannot realize the self-test function. Lay another lead wire in the disconnection device to connect to the inverter to realize the self-test alarm function of the rapid shutdown device

In this way, a lead wire is introduced to transmit a fault signal containing another weak voltage, and the internal of the quick shutdown device needs to be strengthened to insulate the signal, which not only increases the difficulty of design, but also further increases the difficulty of the above two installations. Difficulty and complexity of the method

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