Photovoltaic microgrid system and photovoltaic microgrid system control method

Abstract

The invention provides a photovoltaic microgrid system and a photovoltaic microgrid system control method. The photovoltaic microgrid system comprises a plurality of twin-stage photovoltaic power generation sub systems in parallel, wherein any one of the twin-stage photovoltaic power generation sub systems comprises a plurality of powder optimizers, a plurality of power optimizer control units, a centralized inverter and a centralized inverter control unit. The photovoltaic microgrid system control method comprises the following steps of: acquiring active power and passive power output by the centralized inverter for any one of the photovoltaic power generation sub systems; acquiring the available maximum active power and the available maximum passive power of the centralized inverter; and acquiring a reference voltage; and generating a control signal of the centralized inverter. The photovoltaic microgrid system and the photovoltaic microgrid system control method provided by the invention realize coordinated control of the plurality of photovoltaic power generation sub systems in a communication-free condition, so that autonomous and reasonable distribution of load power is guaranteed and the voltage and frequency of the photovoltaic microgrid system are stable.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, and more specifically, to a photovoltaic microgrid system and a control method for the photovoltaic microgrid system. Background technique [0002] Photovoltaic power generation has the advantages of less environmental pollution, flexible installation locations, and high energy utilization. It is one of the important development trends of distributed power generation at present. As an effective carrier for integrating distributed photovoltaic power sources, photovoltaic microgrid can coordinate photovoltaic power generation systems in different regions, overcome the random uncertainty and regional dependence of some photovoltaic power generation to a certain extent, and improve the overall stable power supply capacity and power quality of the system . When the photovoltaic microgrid operates in the off-grid mode, the photovoltaic power generation system has certain ...

AI Technical Summary

Problems solved by technology

The existing coordinated control of centralized inverters is based on the communication between two-stage photovoltaic power generation systems, and the system voltage or frequency is adjusted by coordinating the power balance between two-stage photovoltaic power generation systems, which requires a high communication bandwidth and does not have Plug and play features and high reliability

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