Solar battery self-powered anti-pid device and control method thereof

Abstract

The invention relates to a proportion integration differentiation (PID)-resistant device for self power supply of a solar cell. By the PID-resistant device, the defect of the prior art is overcome. In the technical scheme, the PID-resistant device is arranged in a convergeence box of a solar power station, the convergenece box internally comprises a module series fuse, the PID-resistant device and a DC circuit breaker, a solar module string is connected with the DC circuit breaker by the module series fuse after being connected in parallel and is combined into an inverter, the inverter is used for converting a direct current into an alternating current, the alternating current is input to a power grid, the PID-resistant device comprises a voltage extraction device, a charging controller, a charging circuit breaker, an energy storage device, a discharge circuit breaker, a discharge controller and a system control device, the voltage extraction device is connected with the solar module string and is used for obtaining a voltage value of the solar module string and transmitting the voltage value to the system control device, the charging control device is connected with the solar module string by the voltage extraction device and is used for controlling a voltage and a current to charge the energy storage device, and the charging circuit breaker is arranged between the charging control device and the energy storage device.

Description

technical field [0001] The invention relates to the field of solar power generation improvement, in particular to an anti-PID device powered by solar cells and a control method thereof. Background technique [0002] Solar power generation has been more and more widely used. The common structures of solar power plants are centralized inverter structure and module string inverter structure (see attached figure 1 , attached figure 2 And attached image 3 ). The centralized inverter structure includes solar modules, DC combiner boxes, centralized inverters, transformers and other equipment. Dozens or hundreds of strings of solar modules are connected in series and parallel to a centralized inverter, and a centralized inverter The controller has only one maximum power point tracking (MPPT) device. The advantage of the centralized inverter structure is that the initial investment is low, but in the actual operation of the power station, there will be bypass diode damage, PID ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the above-mentioned prior art will cause damage to the inverter

If the anti-PID device is installed at the combiner box close to the module string, the problem that the anti-PID device cannot work because there is no AC power supply is provided. A self-powered anti-PID device and its control are provided. method

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