三种风电机组拓扑下风光储混合系统的雷电过电压仿真分析

Analysis on Lightning Overvoltage in Wind-Photovoltaic-Battery Hybrid System with Three Topologies of Wind Turbine

风光储混合系统与单一风电场或光伏系统的雷电暂态响应存在较大差别,混合系统中风电机组通常有链形、环形和星形3种拓扑,不同拓扑会改变系统的端口阻抗网络特征,进而影响混合系统的过电压分布。为此,采用PSCAD/EMTDC搭建了3种风机拓扑下风光储混合系统的暂态模型,计算3种拓扑下风机遭受雷击后混合系统的过电压分布,分析风机拓扑对过电压的影响。结果表明,链形及环形拓扑下,接闪风机的位置会显著影响混合系统的过电压水平,最靠近母线风机遭雷击时光伏及储能系统的过电压峰值是其余风机接闪时的3倍;链形、环形和星形3种拓扑对混合系统过电压的抑制效果依次增强,结果可为风光储混合系统的雷电防护提供参考。

Existing literatures show that the transient response of the wind-photovoltaic(PV)-battery hybrid system to lightning is distinct from that of a single wind farm or PV system.In the wind-PV-battery hybrid system,wind turbines are usually arranged with three topologies,namely,the chain topology,ring topology,and star topology.Different kinds of topologies will change the characteristics of the port impedance network and affect the overvoltage distribution in hybrid system.Therefore,PSCAD/EMTDC is used to build a transient model of the hybrid system with three topologies in wind farm.The overvoltage distribution of the hybrid system is calculated and then the influence of overvoltage is analyzed when different wind turbines are struck by lightning.Results show that the overvoltage of the hybrid system with the chain topology and ring topology is affected by the location of wind turbine.When the wind turbine closest to the bus is struck by lightning,the overvoltage peak of the PV and battery system is 3 times that of the other wind turbines.The suppression effect of the chain topology,ring topology and star topology on overvoltage of the hybrid system is enhanced successively.The simulation results can provide reference for lightning protection of the wind-PV-battery hybrid system.