Power quality improvement method for photovoltaic storage power generation system based on layered control

Abstract

A power quality promotion method of a light storage power generation system based on hierarchical control provided by the invention comprises the following steps: a, constructing a light storage combined power generation system, wherein the constructed light storage combined power generation system comprises a hybrid energy storage unit arranged on the direct current side of a distributed photovoltaic power generation system; and b, carrying out active management on power quality through power dispatcher control and local power of the light storage combined power generation system. The distributed light storage combined power generation system can effectively stabilize the fluctuation of photovoltaic output power, and strengthens the schedulability of the light storage combined power generation system; and a harmonic current detecting algorithm based on self-adaptive iteration can effectively detect the harmonic component of local load, and provides guarantee for local compensation of the power quality of the distributed light storage combined power generation system. The invention provides a new method for operation and control of the high-permeability photovoltaic power generation system, can effectively promote the power quality of power grid, and provides powerful guarantee for safe and stable operation of the power grid.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method for improving the power quality of an optical storage power generation system based on layered control. Background technique [0002] my country has a vast territory, and power resources and power loads are distributed in reverse along the east-west corridors, and high voltage and long distances cannot be avoided for a long time. However, the research results show that the large-scale long-distance transmission of new energy has exposed many disadvantages, such as the stable operation of wind and light centralized power plants, and the limitations of transmission corridors. Distributed photovoltaic power generation system is an effective way to organize renewable energy, but with the continuous improvement of distributed photovoltaic penetration, it brings challenges to the power supply quality of the grid. Distributed photovoltaic power generation systems often use inverte...

AI Technical Summary

Problems solved by technology

However, studies have shown that photovoltaic power generation systems are often difficult to operate at full power generation, and their grid-connected inverters have a large amount of surplus power capacity

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