双级矩阵变换器励磁双馈风力发电系统比例谐振控制

Proportional Resonant Control for Two Stage Matrix Converter Excited Doubly-fed Wind Power Generation System

双级矩阵变换器(two stage matrix converter,TSMC)存在中间直流环节,但不包含大容量直流环节储能电容。鉴于此,引入TSMC作为双馈风力发电系统的励磁电源,建立了基于定子磁链定向的双馈风力发电控制系统。同时,结合比例谐振(proportional resonant,PR)控制器的特性,设计了转子侧变换器PR控制策略。研究发现:该方法通过将矢量控制策略下的有功电流和无功电流分量转换到静止坐标系下进行调节,能实现双馈发电机有功、无功功率的独立调节;与采用PI控制器的矢量控制相比,该控制策略无需多次坐标变换,简化了控制算法;控制模型不存在耦合项和前馈补偿项,提高了系统的鲁棒性;采用该控制系统能够改善系统输出电流质量。仿真与实验结果表明TSMC励磁双馈风力发电系统的PR控制具有良好的动、静态性能。

Two-stage matrix converter（TSMC） has a real DC link,while it does not contain large DC link energy storage capacitors.Thereby,we introduced TSMC as an excitation source of doubly-fed wind power generation system,and established a control system of doubly-fed wind power generation based on the stator flux linkage orientation.Moreover,we developed a proportional resonant（PR） control strategy used in rotor converter according to principle of PR control.In this method,the active and reactive current components in the vector control strategy are adjusted after transforming into a stationary coordinate to realize the doubly-fed generator independent regulation of active and reactive power.Compared with vector control using PI controller,this strategy does not need repeated coordinate transformation but simplify the control algorithm;for no coupling term and feed-forward compensation exist,the robustness of the control system is improved,improving the quality of output current.Simulation and experimental results show that PR control of TSMC excited doubly-fed wind power generation system has a good dynamic and static performance.