Coordinated control method for island operation mode of microgrid containing lithium battery and supercapacitor

Abstract

The invention discloses a coordinated control method for the island operation mode of a micro-grid containing a lithium battery and a supercapacitor. The energy storage system and the respective local controllers of the photovoltaic power generation system and the combined energy storage system. The microgrid coordination controller determines the coordination control command, and sends it to the local controller of photovoltaic power generation and the local controller of the joint energy storage system for power tracking control, so as to realize the coordinated control of the photovoltaic power generation system and the joint energy storage system. The invention utilizes the advantages of high power density, fast response speed, and almost unlimited charge and discharge times of supercapacitors, balances the high frequency and small amplitude fluctuations of power, and provides voltage and frequency references for microgrid systems at the same time; utilizes lithium batteries with energy The characteristics of high density and limited charge and discharge times can effectively balance low-frequency power.

Description

technical field [0001] The invention relates to a coordinated control method for an island operation mode of a microgrid containing a lithium battery and a supercapacitor, and belongs to the technical field of new energy power generation. Background technique [0002] The primary task of the coordinated control strategy of the island-operated microgrid is to ensure the stability of the microgrid and the quality and reliability of power supply for important loads, and to avoid the impact of new energy power fluctuations on the microgrid; It is easily affected by the unbalanced relationship between new energy power generation and load supply and demand, resulting in overcharging and overdischarging phenomena, and the limitations of a single energy storage system cannot meet diverse electric energy needs. After adopting hybrid energy storage, especially for microgrids containing lithium batteries and supercapacitors, it is necessary to give full play to the advantages of differ...

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Problems solved by technology

[0004] The present invention aims to solve the problem that the coordination control method of the island operation mode of the microgrid containing lithium batteries and supercapacitors in the prior art does not give full play to the advantages of lithium batteries and supercapacitors, and the stability of the microgrid is difficult to guarantee. Coordinated control method for microgrid island operation mode of lithium battery and supercapacitor

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