A load frequency control method for multi-domain power system with wind storage

Abstract

The invention relates to a multi-domain electric power system load frequency control method with wind storage. The method comprises the following steps of S1, constructing a multi-domain electric power system and establishing a mathematic model of an electric generator; S2, establishing a state model containing an uncertain item; S3, designing a sliding mode surface; S4, designing a sliding mode load frequency controller; S5, carrying out interval division on an electric power system load and providing different control strategies aiming at loads in different intervals. Compared to the prior art, by using the method of the invention, an energy storage subsystem is participated in system frequency adjusting, and the uncertain item of a parameter in an interconnection system and a control channel time delay problem of an energy storage system are considered. According to an interval of a system load disturbance change, the different control strategies are provided, and the method possesses advantages that a system frequency offset and system overshoot are low; a time terminal is adjusted and electric power system stability is high. Compared to a system with energy storage under traditional PI control, by using the method of the invention, a capacity of energy storage equipment is reduced and investments of the electric power system are decreased.

Description

technical field [0001] The invention relates to a load frequency control method of a power system, in particular to a load frequency control method of a multi-domain power system including wind storage. Background technique [0002] Frequency is one of the important indicators reflecting the safe and stable operation of the power system. In the normal operation of the power system, the frequency control is mainly completed by adjusting the active output of the generator. When a large disturbance occurs in the power system, that is, the power generation is seriously unbalanced, the frequency recovery of the power system needs to rely on load frequency control to keep the frequency within the range allowed by the power industry. [0003] At present, wind energy is an inexhaustible clean and renewable energy, which has attracted the attention of scholars and experts, and the proportion of wind power generation is also increasing year by year. However, wind energy is intermitte...

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Problems solved by technology

[0008] The document "The sliding mode load frequency control for hybrid power systembase on disturbance observe, Yang Mi, Yang Fu, Dongdong Li" designed a sliding mode controller based on the disturbance observer for single-domain power systems with wind turbines, but only limited to single-domain power system, and no energy storage system is introduced to participate in power system frequency regulation

[0009] The literature "Decentralized Sliding Mode Load Frequency Control for Multi-AreaPower systems, Yang Mi, Yang Fu, Wang Chengshan" designed a sliding mode controller for multi-domain interconnected power systems, which effectively reduced the system frequency deviation and enhanced the stability of the system , but the influence of new energy and energy storage on power system frequency regulation is not considered in the whole system

[0010] The literature "Load frequency control by neural-network-based integral slidingmode for nonlinear power systems wind turbine, Dianwei Qian, Shiwen Tong, HongLiu" designed a neural sliding mode controller for multi-domain power systems with wind turbines, but did not consider energy storage systems The adjustment function of the power system does not have a fine control strategy for the frequency adjustment of the power system

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