基于双环控制的双馈风力发电机组控制策略

Control Strategies Based on Double-Loop Control for Doubly Fed Induction Generators

在分析了双馈风力发电机组运行特性的基础上,提出一种基于双环控制的变换器控制策略。在转子侧,变换器采用定子磁链定向矢量控制技术,推导出了用转子有功电流和无功电流独立解耦控制有功功率和无功功率的策略,并实现了风能的最大跟踪;在电网侧,变换器采用电网电压定向矢量控制技术,构建了电流内环、电压外环的双闭环PI控制系统。利用PSCAD/EMTDC软件,构建了双馈风力发电机组仿真模型。

On the basis of the analysis of the operating characteristics of the double-fed induction generator（DFIG）, double-loop control strategies of converters for the DFIG are proposed in this paper. By using the stator flux linkage oriented vector control technology for the rotor side converter, the controls of active power, reactive power and track of the maximum wind- energy are realized independently by rotor active current and reactive current. By using the grid voltage oriented vector control technology for the grid side converter, the double closed-loop PI control of current inner-loop and voltage outer-loop is constructed. A simulation model of the doubly fed induction generator（DFIG） is established using PSCAD/EMTDC software. The results obtained have proved the effectiveness and reasonability of the proposed control strategies.