Huadian Technology ›› 2016, Vol. 38 ›› Issue (4): 37-39.

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Auxiliary power supply changeover scheme for the cross regional power transmission of large capacity thermal power unit

  

  1. SEGC Zhaoshipan Coal fired Power Company Limited,Yulin 719000,China
  • Published:2016-04-25

Abstract:

Abstract:There are six independent regional power grids in China,which are running at their respective frequencies.In order to realize the crossregional power transmission of thermal power plant,the parallel change over problem should be solved, which is because of the different grids between the auxiliary working power supply and stand by power supply.This paper analyzed the reasons that caused the difficulty of auxiliary power supply change over,and proposed some measures of leading the power supply of standby transformer from the busbar of booster station or adding generator circuit breaker at the power plant design process. For the built power plants,the two auxiliary power supplies are from two regional power grids,it could realize the parallel changeover of auxiliary power supply through adding synchronizing devices for the switches of auxiliary working power supply and stand by power supply,and taking the generator operation with auxiliary power supply as intermediate link when the unit is starting up or shutting down.

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