Centralized operation management and control method for alternating-current and direct-current hybrid system containing renewable energy source/hydrogen energy

Abstract

A centralized operation management and control method for an alternating-current and direct-current hybrid system containing renewable energy / hydrogen energy comprises the following steps that S1, a large signal model of the system is expressed to obtain system coefficient matrixes A and B, X is a state variable matrix of the system, and u is a system control rate; S2, a Lyapunov function is constructed, and a new system control rate is designed as follows: unew =-kBTP [delta] X; S3, a new system model is constructed, wherein a centralized operation control framework is provided for an alternating-current and direct-current hybrid system containing renewable energy sources / hydrogen energy; S4, a power instruction of each control object is obtained; and S5, each power instruction istransmitted to each corresponding control object by the information network, and centralized operation management and control of the alternating-current and direct-current hybrid system containing renewable energy sources / hydrogen energy is realized. According to the invention, the problems of a complex controller design and a difficult parameter design in the alternating-current and direct-current hybrid system in the traditional method are reduced, and the operation performance of the renewable energy / hydrogen energy alternating-current and direct-current hybrid system is improved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a centralized operation control method for an AC / DC hybrid system containing renewable energy / hydrogen energy. Background technique [0002] With the development of economy and technology, traditional fossil energy not only produces greenhouse gases to pollute the environment, but also its reserves are gradually decreasing. As one of the important ways of renewable energy application, hydrogen energy has the characteristics of cleanness and large capacity, which can help improve energy conversion efficiency and stability of power grid operation. [0003] The AC / DC hybrid system is a new future grid topology proposed in recent years, which can interconnect renewable energy with the traditional power system. Its common multi-level system structure is as follows: figure 1 shown. Among them, through converters (such as VSC1, VSC2 and VSCn), one or more AC systems can be connected to t...

AI Technical Summary

Problems solved by technology

However, in the multi-terminal system containing renewable energy / hydrogen energy, the typical constant DC voltage control damping is weak, the stability is poor, and the design of the PI controller is complicated, which makes it difficult to ensure the multi-system integration of multiple devices. The problem of coordinated control effects of control parameters

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