Transient stability control system and method for ultrahigh voltage AC/ DC transmission system

Abstract

The invention discloses transient stability control system and method for an ultrahigh voltage AC / DC transmission system. The system and method are characterized in that a coordination control strategy is proposed for solving the problems of voltage transient stability and power angle transient stability of a system of thermal-generated power bundled with wind power, a doubly-fed wind-driven generation group and a DC regulator serve as the control objects of the coordination control strategy, and the characteristic of active and reactive decoupling control of a doubly-fed wind-driven generator and quick active regulating of a DC system serve as the basis of the coordination control strategy. According to the system and method, the associated coordination control strategy is implemented with a rectifier at the transmission end of a DC transmission system and a wind power plant as the control objects; the power angle swing amplitude of a thermal power generating unit can be inhibited by controlling the DC transmission power, and meanwhile, high voltage disturbance is produced; therefore, the voltage drop caused by the regulating of the DC system can be supplemented by the regulation of the wind power plant.

Description

technical field [0001] The invention relates to a transient stability control system and method for an ultra-high voltage AC / DC power transmission system. Background technique [0002] As a new energy utilization method with the most conditions for large-scale development, wind power has developed rapidly in my country. For the wind energy resources distributed in Northwest, North China and Northeast China, due to the limited local consumption capacity, wind energy resources must be efficiently utilized through long-distance transmission. In order to consume wind power in the national market, "wind-fire bundling" networked UHV DC transmission is one of the important ways to send power to wind power energy bases with tens of millions of kilowatts in the future. The so-called "wind-fire bundling" networked UHV DC transmission system means that the power supply at the sending end of the DC transmission system is composed of large-scale double-fed wind farms and conventional th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a transient stability control system for UHV AC / DC transmission system to solve the problem of power angle transient instability risk and voltage fluctuation exceeding the limit, and at the same time provide a control method using the system

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