Abstract

The proposal of carbon peak and carbon neutral strategy puts forward higher requirements for the safe operation of large hydropower units, and the selection of neutral grounding mode of large hydropower units is an important aspect related to the safe operation of generators. In order to improve the safety and reliability of hydropower unit operation, a multi-objective optimization design method for neutral grounding parameters of large hydropower units is proposed in this paper. Firstly, the influence of neutral grounding parameters on the operation of hydropower units is analyzed; Secondly, according to the multiple objectives of grounding fault current, transmission overvoltage, neutral displacement voltage and displacement voltage coefficient, the neutral grounding parameters of hydropower units are optimized based on the multi-objective optimization algorithm. Finally, the stator winding single-phase ground fault model is built and the simulation results show that the parameters obtained by the proposed method can greatly reduce the ground fault current and meet the requirements of transient overvoltage and neutral displacement voltage at the same time, which can improve the safety performance of generator operation and alleviate the impact of single-phase ground fault on hydropower units and provide a reference for the research of protection strategy of large hydropower units.

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