Coordination control method for complex hybrid energy storage system in alternating-current micro-grid connection state

Abstract

The invention relates to a control method for an alternating-current micro-grid energy storage system, in particular to a coordination control method for a complex hybrid energy storage system in an alternating-current micro-grid connection state. The coordination control method solves the problem of a control method for the complex hybrid energy storage system at present. According to the coordination control method disclosed by the invention, the fluctuation of output power of a micro-grid distributed power supply can be suppressed effectively, and the stability for the output power of a load is guaranteed; for the characteristics of lithium batteries and a super capacitor, the input power and output power of the lithium batteries and the super capacitor are distributed reasonably, the cycle life of each lithium battery is prolonged, and the operation cost of a micro-grid is reduced; moreover, in order to facilitate the management of the lithium batteries, the power among the lithium batteries is distributed reasonably in the control method, so that the unification and synchronization of SOC values of the lithium batteries are guaranteed; controllability for exchange power of the micro-grid and a large power grid is realized, and the PCC exchange power value can be set in real time according to user requirements, so that the influence of the micro-grid on power prediction and generation scheduling of the large power grid is reduced.

Description

technical field [0001] The invention relates to a control method for an AC micro-grid energy storage system, in particular to a coordinated control method for a complex hybrid energy storage system in an AC micro-grid grid-connected state. Background technique [0002] In recent years, with the increasingly tense relationship between international energy supply and demand, distributed power generation technology and micro-grid technology based on renewable energy such as wind turbines and photovoltaics have received more and more attention. When distributed renewable energy such as wind turbines and photovoltaics are connected to the grid, they usually operate in Maximum Power Point Tracking (MPPT) mode to maximize the use of renewable energy. The distributed integration of renewable energy into the microgrid has randomness and fluctuations Due to the characteristics of nature, a large number of distributed power sources will have an impact on the large power grid and affect...

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Problems solved by technology

[0006] The present invention solves the problem of lack of control methods for complex hybrid energy storage systems at present, and provides a coordinated control method for complex hybrid energy storage systems in the grid-connected state of AC microgrids

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