A Hierarchical Fuzzy Coordinated Control Method for DC Microgrid

Abstract

The invention provides a layered fuzzy coordination control method of a direct-current micro power grid. The method comprises two layers of control. The bottom layer control adopts a control strategy of each unit interface converter in the direct-current micro power grid. An adjuster in the closed-loop control strategy of each unit interface converter is a fuzzy adaptive PI adjuster. The upper layer control adopts a fuzzy energy management strategy. The operation mode of the direct-current micro power grid is determined according to the direct-current bus voltage and storage battery electrical charge states, and the control strategy of each unit interface converter is correspondingly determined according to the operation mode of the direct-current micro power grid. According to the invention, stable operation of a wind power generation unit, a photovoltaic power generation unit, a storage battery energy storage system, a direct-current load unit, an alternating-current load unit and a grid-connected interface unit can be coordinated.

Description

technical field [0001] The invention relates to a coordinated control method of a DC microgrid. Background technique [0002] Problems such as energy crisis and environmental pollution have attracted widespread attention from all over the world. Accelerating the development and utilization of renewable energy to generate electricity and adjusting the energy structure is one of the effective measures to solve the above problems. Wind energy and solar energy are important components of renewable energy. However, their output power is random and intermittent, and distributed power generation units have disadvantages such as high single-machine access cost, low capacity, and lack of flexibility and controllability. Therefore, they are compared with The battery energy storage system, load unit, and grid-connected interface converter constitute a microgrid, and it is an effective way to integrate into the large grid in the form of a microgrid. [0003] Since the traditional power...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of using a single variable of the DC bus voltage to divide the operation mode and the control performance of each converter in the prior art. The dynamic response speed is slow and the anti-disturbance performance is poor, and a DC microgrid layered fuzzy coordination Control Method

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