Coordinated scheduling strategy for multi-element energy storage in distributed microgrid system for optical storage

Abstract

A coordinated scheduling strategy for multiple energy storage in an optical storage distributed microgrid system, based on a two-stage converter topology structure for multiple energy storage, includes a front-stage bidirectional DC / DC conversion unit and a rear-stage DC / AC conversion unit. The bidirectional DC / DC conversion unit for the battery and the bidirectional DC / DC conversion unit for the super capacitor share a DC bus, and are connected to the load and the large power grid through the DC / AC conversion unit through the LC filter. The method for coordinated scheduling of two-stage converters for multiple energy storage is as follows: in the grid-connected mode of the distributed optical storage microgrid system, double filtering control is performed on the two-stage converters for multiple energy storage, and the energy storage elements are controlled. It is used to smooth the fluctuation of photovoltaic output power, and adjust the respective filtering parameters according to the state of charge of the supercapacitor and the state of charge of the battery; when the distributed optical storage microgrid system is off-grid, the energy storage element is controlled to be distributed optical storage. The microgrid system provides voltage and frequency support, and the distributed optical storage microgrid system jointly supplies power for the load; the energy storage elements are batteries and supercapacitors.

Description

Technical field [0001] The invention relates to a multi-element energy storage coordinated scheduling method of a distributed optical storage micro-network system. Background technique [0002] Distributed grid-connected photovoltaics are located in the vicinity of users, which can solve the power consumption of users nearby, reduce users’ dependence on grid power supply, and reduce grid line losses; and under appropriate conditions, with the energy storage system, combined with coordinated control strategies, it can be isolated from the grid. The net operates independently. [0003] When distributed photovoltaic power generation is connected to the grid, the energy storage system can be used to effectively reduce the negative impact of grid-connected photovoltaic power generation output power fluctuations on the grid, and ensure that photovoltaic power generation can be reliably integrated into the conventional grid. In the island operation mode, the rapid response capability of ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage of low power density of the existing single battery energy storage, and propose a coordinated scheduling strategy for multi-element energy storage in a distributed optical storage micro-grid system

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