一种新型的风电场低电压穿越时撬棒电路设计与阻值选定

Resistance Value Selection and Design of New Crowbar Circuit for Low Voltage Penetration of Wind Farm

针对传统撬棒电路(Crowbar)在风电场低电压穿越时给电网带来无功负担问题,提出了一种新型的Crowbar保护电路,介绍了新型Crowbar的设计与阻值选定,并在PSCAD环境下搭建双馈式感应发电机(DFIG)模型,分析比较了无Crowbar保护电路、带有传统Crowbar保护电路和新型Crowbar保护电路时DFIG在电网电压跌落情况下的动态特性。结果表明,新型的Crowbar在有效保护风电场的同时减少了电网的无功负担,有效地弥补了传统Crowbar带来的电网无功负担。

Aiming at the reactive power burden of power grid for wind farm in low voltage penetration with traditional Crowbar circuit, a new Crowbar protection circuit is put forward. It describes the design of new Crowbar and selection of the resistance. The DFIG model is implemented in the PSCAD. The dynamic characteristics of DFIG without Crowbar, with traditional Crowbar protection circuit and the proposed Crowbar protection circuit are compared under the conditions of grid voltage drop. The results show that the proposed Crowbar has better protective performance and complete the traditional Crowbar on the burden of reactive effectively.