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Wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method

A load frequency control and power system technology, applied in wind power generation, reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve problems such as existence and system frequency deviation

Active Publication Date: 2015-10-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Although adjusting the proportional gain and integral gain can weaken the influence of time lag on the system and make the system frequency deviation reach the specified allowable error range, the system frequency deviation always exists

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  • Wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method
  • Wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method
  • Wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method

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Embodiment Construction

[0083] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0084] (1) The present invention contains the mathematical model of the time-delay interconnection power system of wind power

[0085] The multi-domain interconnected power system is decentralized and controlled, and each regional power system mainly includes a thermal power generation system and a wind power generation system. When wind power is connected to the traditional power system to participate in power generation, because wind power has its own intermittent and fluctuating characteristics, uncontrollable, complex control, etc., it is easy to cause fluctuations in sy...

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Abstract

The invention relates to a wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method. The method includes the following steps that: (1) a power system is divided into a plurality of areas including thermal power generation systems and wind power generation systems; (2) with a sliding-mode load frequency controller adopted as a control variable ui (t), uncertain items of system parameters and disturbance caused by load fluctuation are added into a model, so that uncertain item-containing state models can be established; (3) an integral type sliding mode surface sigma i (t) is designed according to concentrated uncertain item-containing state models; (4) the sliding-mode load frequency controller ui (t) is designed; and (5) the ui (t) is adopted as a control instruction to optimize the load frequency deviation of the power system. Compared with the prior art, the control method of the invention has the advantages of simple control, high robustness and wide time-lag margin. According to the control method, communication delay is considered, and obvious optimized control effects can be obtained under different conditions.

Description

technical field [0001] The invention relates to a load frequency control method of a multi-domain time-delay interconnection power system, in particular to a sliding mode load frequency control method of a multi-domain time-delay interconnection power system including wind power. Background technique [0002] Frequency is one of the important indicators reflecting the safe and stable operation of the power system. The frequency control in the normal operation of the power system 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, a large number of wind power generators are connected to the traditional power system to participate in power generation, but due to the volatility of wind energy,...

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Application Information

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IPC IPC(8): H02J3/24H02J3/46
CPCY02E10/76
Inventor 米阳刘永娟马超吴彦伟朱银珠
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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