Coordinated control method for island operation modes of microgrids containing lithium batteries and super capacitors

Abstract

The invention discloses a coordinated control method for island operation modes of microgrids containing lithium batteries and super capacitors. A microgrid includes a photovoltaic power generation system, a load, a microgrid coordination controller, a combined energy storage system consisting of a lithium battery energy storage unit and a super capacitor energy storage unit and the respective local controllers of the photovoltaic power generation system and the combined energy storage system. The microgrid coordination controller determines coordinated control instructions to issue to the photovoltaic power generation local controller and the combined energy storage system local controller to perform power tracking control, so that the coordination control of the photovoltaic power generation system and the combined energy storage system can be realized. Through the utilization of the advantages of a super capacitor of high power density, fast response speed and unlimited charging anddischarging frequencies, the high frequency and small fluctuation of power can be balanced, and the voltage and frequency reference of a microgrid system can be provided; and through the utilizationof the characteristics of the lithium battery of large energy density and limited charging and discharging frequencies, low frequency power can be effectively balanced.

Description

Technical field [0001] The invention relates to a coordinated control method for the island operation mode of a microgrid containing lithium batteries and supercapacitors, and belongs to the technical field of new energy power generation. Background technique [0002] The primary task of the coordinated control strategy of a microgrid operating in an island is to ensure the stability of the microgrid and the power supply quality and reliability of important loads, and to avoid the impact of new energy power fluctuations on the microgrid; when a microgrid with a single energy storage is operated in an island, It is easily affected by the unbalanced relationship between new energy power generation and load supply and demand, resulting in overcharge and over-discharge. Moreover, the limitations of a single energy storage system cannot meet the diverse power needs. After using hybrid energy storage, especially for microgrids containing lithium batteries and supercapacitors, it i...

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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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