风电场风力发电机类型对网侧电能质量特性的影响

Impact of Wind Turbine Types in Wind Farm on Grid-Side Power Quality

为探明不同的风力发电机类型对网侧电能质量的影响特性,从机理上揭示了不同机组类型引起网侧电压偏差、电压波动和谐波等电能质量问题的原理。基于PSCAD/EMTDC分别建立了可投切无功补偿装置的定速风力发电机网侧电能质量特性仿真模型、可实现定功率因数和定无功功率运行的变速风力发电机网侧电能质量特性仿真模型。对网侧电压偏差、电压波动及谐波特性的仿真分析表明:定速风力发电机对网侧电压偏差和电压波动影响显著;变速风力发电机对网侧电压偏差和波动影响较小,但会导致网侧母线谐波污染严重。此分析结果可为风电场电能质量治理和风电场并网区域电网电能质量治理研究提供参考。

In order to discuss the impact of different wind turbine types on grid-side power quality, some power quality problems caused by different wind turbine types are studied, such as grid-side voltage deviation, voltage fluctuation and harmonic. Based on PSCAD/EMTDC, the grid-side power quality simulation models were built respectively for the fixed- speed wind turbine which could switch reactive power compensation device, as well as for the variable-speed wind turbine which could operate under constant power factor or given reactive power. The simulation analysis of grid-side voltage deviation, voltage fluctuations and harmonic characteristics shows that, the wind farm with fixed-speed wind turbine has more significant effect on grid-side voltage deviation and voltage fluctuation than that with variable-speed wind turbine, but could cause serious harmonic pollution. The research results can provide a theoretical basis for the power quality management strategy according to different kinds of wind farms in China and the power quality management for regional power grids.