Study on the influence of different grounding modes of wind farm on over-voltage level

Over-voltage level is a key parameter of AC transmission system in wind farm. This paper analyzes the characteristics of different neutral grounding modes, expounds the function and basic principle of Z-type grounding transformer, builds the Z-type grounding transformer model and wind field model in PSCAD, simulates and analyzes the impact of different grounding modes on system over-voltage, and provides a reference for the selection of wind farm grounding mode and stable operation.