Load-frequency control method of multi-domain time-lag electric power system with high wind energy permeability

Abstract

The present invention relates to a load-frequency control method of a multi-domain time-lag electric power system with high wind energy permeability. The method comprises the following steps: S1, establishing a time-lag electric power system with multiple domains, and establishing the mathematics model of each generation system; S2, establishing state models with uncertain items corresponding to each domain according to the mathematics model of a generator; S3, designing an integration type sliding mode surface [Sigma]I (t) according to the state models with uncertain items; S4, designing the sliding mode load frequency controller according to the integration type sliding mode surface [Sigma]I (t); and S5, taking a controller ui(t) obtained in the step S4 as a controlling instruction, and optimizing the load frequency offset of the electric system. Compared with the prior art, a wind driven generator participates the regulation of the system frequency to tightly cooperate the wind power generation with the traditional fire power generation, and the increment of the output power of each generator is evenly reduced to ensure the power supply and demand balance of each area and effectively reduce the frequency offset of each area.

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 time-delay power system with high wind energy penetration rate. 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. At present, clean and renewable wind energy has attracted widespread attention, but the volatility of wind energy has led to unstable output power of wind turbines. [0003] When large-scale wind turbines are connected to th...

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Problems solved by technology

Literature "Yang Mi, Yang Yang, Han Zhang, et al."Sliding mode based load frequency control for multi-area interconnected power system containing renewable energy", Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014IEEE Conference and Expo.IEEE, 2014 "Decentralized sliding mode load frequency control solves the problem of load frequency control in multi-domain power systems containing wind power, but does not raise the problem of system communication delay

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