基于耗能型Crowbar的风电机组低电压穿越能力研究

Research on Low Voltage Ride Through of Wind Turbine Based on Energy Dissipation Crowbar Circuit

风电机组的低电压穿越(LVRT)能力是风电大规模并网运行的必要条件,是电网故障情况下风电机组具有不间断并网运行能力的保证。采用耗能型Crowbar电路对风电机组的低电压穿越能力进行研究,运用Matlab/Simulink工具箱对其进行仿真分析。结果表明,耗能型Crowbar电路能够对直流母线的过电压进行有效保护,实现了低电压穿越的要求,且该方案的电路拓扑结构简单,可靠性较高。

Low voltage ride through capability of wind turbine is a necessary condition for large-scale grid connected operation. It is the guarantee that the wind turbine has the capability of continuous operation. In this paper,the energy dissipation Crowbar circuit is used to study the low voltage ride through capacity of wind turbine,and the simulation analysis is carried out by using the MATLAB/Simulink toolbox. The simulation results show that the energy-dissipating Crowbar circuit can effectively protect the over-voltage of DC-link and realize the requirement of LVRT. The scheme has simple circuit topology and high reliability.