Short-circuit current analysis under the generator voltage-class-reduction scheme in district grids
DOI:10.7667/PSPC171440
Key Words:generator voltage-class-reduction  short-circuit current  current increase  economy  safety and stability
Author NameAffiliation
TAN Yudong State Grid Hunan Electric Power Corporation Economic & Technical Research Institute, Changsha 410004, China 
CAI Ye Hunan Province 2011 Collaborative Innovation Center of Clean Energy and Smart Grid, Changsha University of Science & Technology, Changsha 410004, China 
XIE Xintao State Grid Hunan Electric Power Corporation Economic & Technical Research Institute, Changsha 410004, China 
LI Xianghua State Grid Hunan Electric Power Corporation, Changsha 410004, China 
XIE Chelun State Grid Hunan Electric Power Corporation, Changsha 410004, China 
WANG Zhicai Hunan Province 2011 Collaborative Innovation Center of Clean Energy and Smart Grid, Changsha University of Science & Technology, Changsha 410004, China 
TANG Xiafei Hunan Province 2011 Collaborative Innovation Center of Clean Energy and Smart Grid, Changsha University of Science & Technology, Changsha 410004, China 
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Abstract:Generator voltage-class-reduction scheme is a kind of efficient and economical approach to solve the imbalance between the increasing local-demand and generator capacity. Whereas, the generator voltage-class-reduction scheme will decrease the short-circuit impedance on the original network side (high-voltage side), in the meanwhile, the short-circuit current in the quasi-accessed networks side (low-voltage side) will be increased, making the short-circuit current exceed the interrupting capacity of the circuit breaker in low-voltage side and affecting the safe operation of the power grid seriously. This paper mainly proposes a novel method of calculating the short-circuit current and a mathematical model in the generator voltage-class-reduction scheme to research the relationship between the variation of short-circuit and the parameters of the generator. The method has been applied to select the generator voltage-class-reduction schemes in Hunan power grids. According to the results of the simulation and application, the method of short-circuit current analysis in this paper can accurately and directly reflect the changing of the short-circuit current in generator voltage-class-reduction schemes, which provides a guarantee for the power grid running with safety and stability. This work is supported by Youth Fund of National Natural Science Foundation of China (No.51607011) and Science and Technology Project of State Grid Corporation of China (No. 5216D114000A).
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