标题:
双馈风力发电机组撬棒保护投切时间不同的影响The Influence of Crowbar Protection Based on Different Cutting Time on Doubly-Fed Induction Generators
作者:
曾宬, 司大军, 王达达, 彭俊臻, 张慧
关键字:
低电压穿越, 电压跌落, 撬棒保护, 双馈感应发电机LVRT; Voltage Dip; Crowbar Protection; DFIG
期刊名称:
《Smart Grid》, Vol.3 No.6, 2013-12-20
摘要:
低电压穿越能力(Low Voltage Ride Through, LVRT)正逐渐成为大型并网风电机组的必备功能之一，要求风电机组在电网电压跌落发生时保持并网，故障消除后快速恢复正常运行。作为现在最通用的低电压穿越方法是增加撬棒保护(Crowbar Protection)模块，但保护的投切易产生瞬时电流冲击，对发电机转子造成损害。本文分析了转子撬棒保护投入与切除策略及动作时间对双馈感应发电机(DFIG)的影响，并基于电磁暂态仿真软件PSCAD/EMTDC对某模型进行仿真论证。Low voltage ride through ability is becoming one of the essential features of large grid-connected wind gen-erators. When the power grid voltage drop occurs, it is necessary for the wind turbines to maintain connecting and return to normal after the fault is eliminated quickly. The most common method of low voltage through is to increase the crowbar protection module, but the protection operations may generate instantaneous current impact, damaging the ro-tors of generator. This paper analyzes the influences of the input and removal strategy of rotor crowbar protection and action time on doubly-fed induction generator (DFIG). Simulations and analysis are made based on the electromagnetic transient simulation software PSCAD/EMTDC.