Comprehensive control method for voltage stabilization of large-scale wind electricity switching-in weak sending end electrical power system

Abstract

The invention discloses a comprehensive control method for voltage stabilization of a large-scale wind electricity switching-in weak sending end electrical power system. The comprehensive control method includes the steps that continuous load flow calculation is used for obtaining a voltage stabilization limit point through solution , and a static voltage stability margin is obtained through solution according to the obtained voltage stabilization limit point; in a normal operation mode, when the static voltage stability margin is lower than 10%, comprehensive control over the voltage stabilization is started; according to a voltage operation limit value issued by a power grid dispatching center, a generatrix with voltage exceeding an upper limit or a lower limit is selected as a generatrix to be adjusted; by the adoption of a sensitivity analyzing method, according to the voltage or reactive sensitivity, the compensation sequence of reactive compensation devices at the positions of different generatrixes is determined; the voltage operation limit value issued by the power grid dispatching center is compared with a voltage practical value to obtain the direction and degree, deviating from the limit value, of the generatrix to be adjusted, and compensation measures for reactive compensation points are determined. The comprehensive control method solves the problems that the large-scale wind electricity switching-in weak sending end electrical power system is poor in voltage stabilization, the quality of the system voltage is low, and wind electricity output is limited.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a comprehensive control method for voltage stability of a weak sending-end power system connected to large-scale wind power. Background technique [0002] At present, wind power, as the most mature and large-scale form of new energy utilization, has developed rapidly in my country in recent years, and the average annual installed speed of wind power has far exceeded the world average. The randomness and uncertainty of wind power make large-scale development of wind power not only bring green energy, but also bring some negative effects to the power system. Since wind farms in my country are generally far away from the main grid and load centers, they need to be sent out in a long-distance centralized way, which makes the grid structure of the wind power transmission channel weak and the short-circuit capacity low. Due to the random fluctuation of wind power and poor controll...

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Problems solved by technology

[0004] The purpose of the present invention is to address the above problems and propose a comprehensive control method for the voltage stability of a weak sending-end power system with large-scale wind power access, so as to solve the problem of poor voltage stability and system voltage quality of the weak sending-end power system with large-scale wind power access. Low and limited wind power output

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