Voltage boosting device isolated from power grid and applied to solar power station and method

Abstract

The invention relates to a method for a voltage boosting device isolated from a power grid and applied to a solar power station. A solar cell, an inverter, a circuit breaker unit and the voltage boosting device are included. An output signal line of the voltage boosting device is in signal connection with the circuit breaker unit. An AC detection device is arranged in the inverter and is conductively connected with the negative electrode of the DC end of the solar cell. The circuit breaker unit comprises a plurality of circuit breakers, and each circuit breaker is arranged between the AC detection device and the power grid. The defects in the prior art are overcome. The circuit breaker unit is arranged between the AC end of the inverter and the power grid. When the voltage boosting modulestarts to work and recovers and prevents PID, the circuit breakers are opened, and the inverter is disconnected from the power grid, so that no voltage is applied to the AC detection module, and damage to internal devices of the inverter is avoided. When the voltage boosting stops working, the circuit breakers are closed, the inverter is connected with the power grid, and the solar power station generates power normally.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a pressurizing device isolated from a power grid and applied to a solar power station. Background technique [0002] When PID attenuation (potential energy induced attenuation) occurs in the solar power station, the recovery and prevention of PID attenuation can be realized by applying a voltage (positive or negative voltage) between the DC terminal and the earth. For solar systems without isolation transformers, the applied voltage will cause damage to the internal components of the inverter. [0003] In order to protect the inverter, some manufacturers set up a DC circuit breaker between the inverter and the solar module. In this way, when the voltage is applied, the DC circuit breaker is disconnected, and the voltage is not applied to the inverter, which protects the inverter. the goal of. However, this technology needs to add at least two circuit break...

AI Technical Summary

Problems solved by technology

It is the AC detection part that is easy to be damaged. When the inverter is not isolated from the grid, the DC potential between the DC ground terminal and the grid line is 0. When the voltage is applied to the DC terminal and the ground , this voltage will be added to the AC detection device. Generally, the withstand voltage of the AC detection device is relatively low and it is easy to be damaged.

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