A transient stability control system and method for an UHV 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 a UHV AC / DC transmission system. Background technique [0002] As a new energy utilization method with the most large-scale development conditions, wind power has been rapidly developed in my country. For wind energy resources distributed in the Northwest, North China and Northeast regions, due to the limited on-site absorption capacity, long-distance transportation must be used to efficiently use wind energy resources. In order to absorb wind power in the national market, "wind-fire bundling" networked UHV DC transmission is one of the important ways for the future power transmission of tens of millions of kilowatts of wind power energy bases. The so-called "wind-fire bundling" networked UHV DC transmission system means that the transmission end of the DC transmission system is composed of large-scale doubly-fed wind farms and conventional thermal power plants in a certain propor...

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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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