Ultrahigh voltage power network interconnection line operating state-based voltage control method

Abstract

The invention relates to an ultrahigh voltage power network interconnection line operating state-based voltage control method, which belongs to the technical field of power system automatic voltage control. The method comprises the following steps of: detecting the commissioning state of an ultrahigh voltage interconnection line; if the ultrahigh voltage interconnection line is not put into operation, performing secondary voltage control according to the default voltage limit; if the ultrahigh voltage interconnection line is put into operation, when the ultrahigh voltage power network interconnection line is at a certain state space, automatically generating a set of voltage limit values of an ultrahigh voltage control bus by using an ultrahigh voltage system; if the state space, where the ultrahigh voltage power network interconnection line is, does not change, not changing the voltage limit values of the ultrahigh voltage control bus; and if the operating state of the ultrahigh voltage power network interconnection line moves to a new state space and an ultrahigh voltage control system detects the change, automatically generating a new voltage limit value of the ultrahigh voltage control bus by using the ultrahigh voltage control system. In the method, a secondary voltage control method in the conventional AVC system is improved, so that the aims of safe and stable operation and economic control of power network equipment are fulfilled.

Description

technical field [0001] The invention belongs to the technical field of automatic voltage control of electric power systems, and in particular relates to a reactive voltage control method based on the running state of an extra-high voltage power grid tie line. Background technique [0002] The UHV power grid refers to a power grid with greater energy and longer transmission distance than the AC 500kV power grid. It includes two different connotations: one is AC ultra-high voltage (UHC), and the other is ultra-high voltage direct current (HVDC). It has the advantages of economical transmission cost, simplified grid structure, small short-circuit current, and less occupation of transmission corridors. According to the definition of the International Electrotechnical Commission: AC UHV refers to the voltage level above 1000kV. In China, the UHV power grid refers to the AC power grid above 1000kV and the DC power grid above 800kV. After the UHV power grid is put into operation...

AI Technical Summary

Problems solved by technology

[0031] After the UHV power grid is put into operation, the active power value transmitted by the UHV tie line will fluctuate in a large range, and then the voltage of the UHV near-area grid will fluctuate in a large range. If the voltage control mode of the above-mentioned AVC system is still used, it will affect the power grid. The safe and stable operation of equipment and the realization of economical control objectives

Images