Overvoltage Analysis and Restrain Measures for Grid with Small Hydropower

doi:10.3969/j.issn.1000－7229.2015.04.004

Abstract

Abstract:

Under the condition that the development and utilization of new energy are vigorously advocated in China, the construction of small hydropower has developed rapidly. However, due to the lack of standardized management, the operation of small hydropower often leads to overvoltage in regional power network. Therefore, combined with the characteristics of small hydropower, this paper constructed the equivalent analysis model of power grid with small hydropower. On this basis, the theoretical analysis was carried out on the serious overvoltage process occurred in three situations: the isolated operation of small hydropower, transferring power supply and going into the wet season. The generation mechanism of overvoltage was studied； and the restrain measures were proposed for the overvoltage from the technical and management level, according to different overvoltage conditions. Finally, based on simulation software DIgSILENT/PowerFactory, this paper constructed the model for actual power grid with small hydropower, and verified the correctness of theoretical analysis and the effect of restrain measures.

Key words: small hydropower, isolated operation, transferring power supply, overvoltage control

CLC Number:

TM 714

CHEN Zhifeng, CHEN Juan, LI Haifeng, ZHONG Qing. Overvoltage Analysis and Restrain Measures for Grid with Small Hydropower[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(4): 21-26.

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