Island control method and system suitable for solar energy storage power generation system

Abstract

Disclosed are an island control method and system suitable for a solar energy storage power generation system; according to the method, firstly, the inversion output power and the load power of an inverter are obtained; then, according to preset logic, the inversion output power and the load power, the inversion output power is adjusted so as to enable the load end voltage to be abnormal along with the adjustment of the inversion output power when the island occurs; and finally, when it is detected that the load end voltage is abnormal, a commercial power relay is disconnected, and the cuttingoff of the commercial power and the solar power generation system is realized. According to an energy positive feedback mode, when the commercial power is lost, the load end voltage is in fast avalanche, and the abnormal protection of the power grid is triggered to disconnect the connection between the load end and the power grid, so that the influence of wide working commercial power frequency range and the large commercial power voltage fluctuation of the solar energy storage power generation system can be avoided, and the island control of the solar energy storage power generation system is realized.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an island control method and system suitable for solar energy storage power generation systems. Background technique [0002] The solar grid-connected power generation system converts solar energy into electrical energy, without storing energy in batteries, and directly sends electrical energy to the grid through grid-connected inverters. Grid-connected means that it must be connected to the public grid, that is, solar power generation, home grid, and public grid are connected together. This is a power generation system that must rely on the existing grid to operate. It is mainly composed of solar panels and inverters. The solar panels are directly converted into 220V AC by the inverter and power household appliances. When the power generated by solar energy exceeds the electricity used by household appliances, the excess electricity is sent to the public. Grid; and when the pow...

AI Technical Summary

Problems solved by technology

In the solar energy storage power generation system, the frequency and voltage of the mains input are very wide, so the active island detection is applied to the solar energy storage power generation system, and the detection time is long, which is easy to generate islands or phase shift after the recovery of the mains power. product damage

It can be seen that for the solar energy storage power generation system, the solar energy storage power generation system has a wider frequency range of mains power and greater fluctuations in the mains voltage, so the traditional island control system cannot meet the requirements of the solar energy storage power generation system.

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