Adjustment method for open-phase operation of phase modifier-transformer bank

Abstract

The invention discloses an adjustment method for open-phase operation of a phase modifier-transformer bank. When two or more phase modifiers operate in a substation, reactive power of the phase modifiers in open-phase operation is adjusted to be close to zero, and meanwhile, the transmitted or absorbed reactive power of the other phase modifiers in perfect phase operation is adjusted to meet supply of the reactive power of a system; and when one phase modifier operates in the substation, the reactive power of the phase modifier is not adjusted in open-phase operation, current conditions, suchas negative sequence current and zero sequence current are judged, the phase modifier is tripped through direct action when the current conditions are met, and an alarm signal is given when the current conditions are not met. According to the method, an open-phase operation fault can be timely adjusted, the phase modifiers can conveniently cope with maintenance at any time, and meanwhile, supply of the reactive power of the system is not affected, thereby ensuring the stability of a grid-connected system.

Description

technical field [0001] The invention relates to a regulating method for non-full-phase operation of a camera-transformer group, and belongs to the technical field of power system relay protection. Background technique [0002] Large-scale synchronous condensers have been put into use in the Zarut Project in Inner Mongolia and the Jiuquan Project in Gansu respectively. At present, large-scale synchronous condensers are installed in 500kV or 750kV AC substations of DC converter stations, and then connected to the grid through step-up transformers. When there is a large disturbance in the system, the reactive power absorbed by the converter station of the DC system increases significantly, and the output of the reactive power compensation device decreases, which will lead to insufficient local dynamic reactive power compensation capability of the power grid and greatly increase the risk of grid voltage instability; and Compared with the static reactive power compensation device...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an adjustment method for the non-full-phase operation of the generator-transformer group, and solve the problem that the non-full-phase fault of the grid-connected circuit breaker affects the grid-connected reactive power supply in the prior art technical issues

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