适应于双馈风电场的改进故障序分量选相方法

Improved fault-sequence component phase selector applied to DFIG-based wind farm

分析了应用于双馈风电场的故障序分量选相元件的动作特性,指出受双馈感应风机特有暂态特性的影响,故障网络中双馈风电场的正、负序等效阻抗差异很大,引起故障序分量选相元件动作性能的恶化。提出一种基于故障序电压补偿的改进故障序分量选相方法,该方法通过对双馈风电场正、负序等效阻抗的实时检测自适应修正阻抗差异对选相结果的影响,改善了传统故障序分量选相元件的动作性能,并通过仿真验证了所提方案的有效性。

The operating characteristics of FSCPS（Fault-Sequence Component Phase Selector） used in DFIG（Doubly-Fed Induction Generator）-based wind farm are analyzed,which points out that there is a large difference between the positive and negative sequence equivalent impedances in the fault network of wind farm due to the special transient property of DFIG,deteriorating the operating characteristics of FSCPS. An improved FSCPS method based on fault-sequence voltage compensation is proposed,which detects the difference between the positive and negative sequence impedances of DFIG-based wind farm in real time and revises the result of phase selection adaptively. The operating characteristics of traditional FSCPS are improved and the validity of the proposed scheme is verified by the simulative results.