Optimal coordinated control method for graded adjustable high voltage reactor and static var compensator

Abstract

Provided is an optimal coordination control method for a hierarchical adjustable high-voltage electric reactor and a static reactive compensator. In an extra-high voltage power transmission line transformer substation containing the hierarchical adjustable high-voltage electric reactor and the static reactive compensator, proper controllable electric reactor gear numbers are fed under multiple operating modes according to the steady-state operation requirement of voltages, and reactive continuous adjustment is achieved through the hierarchical adjustable high-voltage electric reactor and the static reactive compensator. Under different reactive power needs, reactive compensation equipment in the substation should operate under the state corresponding to a bold black line in a figure, and the bold black line in the figure is the coordinating operation line of the reactive compensation equipment in the substation. According to the optimal coordination control method, extra power losses caused by decentralized control over flexible alternate-current transmission equipment can be reduced, and the situation that a plurality of compensation devices work under b, c and other practicable combination modes in the figure, and the reactance of redundant gears exists is avoided. Meanwhile, a controllable high-voltage electric reactor free in the transient process can reserve more gears to restrain overvoltage. Reactive power can be adjusted continuously and conveniently, and when an extra-high voltage power transmission line is heavily loaded and underloaded, the voltages of a transformer substation bus can be controlled to be the proper voltage level.

Description

technical field [0001] The invention belongs to the field of power system operation and control, and in particular relates to an optimal coordinated control method for a graded adjustable high-voltage reactor and a static var compensator. Background technique [0002] In recent years, ultra-high voltage and ultra-high voltage power grids have been put into operation in many areas of my country, which put forward higher requirements for the safe and stable operation of power grids and power quality. To improve the safe operation level and power quality of the power grid, in addition to the rational structure of the power grid itself, it is necessary to have advanced regulation and control means. [0003] Due to the high voltage level of EHV and UHV transmission lines, the reactive power generated by line capacitance is very large, and the power frequency overvoltage caused by asymmetrical short-circuit faults and load rejection is very high. Therefore, in order to reduce the ...

AI Technical Summary

Problems solved by technology

However, for systems with large-scale changes in system power flow and considering the need to maintain good transient characteristics of the system, fixed shunt reactors cannot meet the system voltage regulation requirements due to "fixation"

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