Method for eliminating inrush current influence in coordination control of generator set

Abstract

The invention belongs to electrical equipment and electrical engineering, relates to the field of generator sets, and particularly relates to a method for eliminating inrush current influence in coordination control of a generator set. When the running transformer generates inrush current and the TA current out-of-limit, the TA current second harmonic content out-of-limit, the TA current negativesequence current out-of-limit, the TV abnormal switching condition and the TA current break variable out-of-limit switching condition are met, the device starts the measurement TA and switches to theprotection TA, so that the stability of coordination control of the generator set is kept, and the generator set power oscillation and the problem of tripping of the generator set in the case of severe power oscillation can be avoided; and the problems that in the case of no-load input of a transformer or instantaneous fault of a power grid, inrush current generated by a running transformer can cause saturation of a measurement-level current transformer for a generator power transmitter, the output can not correctly convert primary actual power, and if the deviation is large and large-amplitude fluctuation occurs, the coordination control of the generator set is unstable, the power of the generator set is oscillated, and the tripping of the generator set is caused in the severe case can besolved.

Description

technical field [0001] The invention belongs to electrical equipment and electrical engineering, and relates to the field of generator sets, in particular to a method for eliminating the influence of inrush current in coordinated control of generator sets, which is used to maintain the coordination and stability of generator sets. Background technique [0002] When the transformer is air-dropped or the power grid has an instantaneous fault, the transformer in operation will generate excitation inrush current and inrush current. The inrush current contains obvious harmonic components and DC components, which will cause the measurement-level current transformer used in the generator power transmitter to saturate. Its output cannot correctly transmit and change the primary actual power, the deviation is large and there will be large fluctuations, which will cause the coordination and control of the generator set to be unstable, the power of the unit will fluctuate, and in severe...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the transformer is air-dropped or the power grid has an instantaneous fault, the inrush current generated by the running transformer will cause saturation of the measuring-level current transformer used for the power transmitter of the generator, so that the output cannot be transmitted correctly once For the actual power, if the deviation is large and there will be large fluctuations, it will cause the coordination control of the generator set to be unstable, the power of the unit will fluctuate, and in severe cases, it will cause the problem of tripping of the unit