不平衡电网电压下双馈异步风力发电机组控制策略研究

Control of Doubly Fed Wind Turbine With Unbalanced Grid Voltage

针对传统的基于PI控制策略的双馈风力发电机组(DFIG)在不平衡电网电压下运行时,其输出功率与直流母线电压出现倍频波动的问题,建立不平衡电网电压下的DFIG和网侧变换器数学模型,提出一种基于模糊-比例谐振控制器(Fuzzy-PR)的矢量控制策略.通过Matlab/Simulink平台搭建仿真模型,分析、比较传统控制策略和改进控制策略在不平衡电网电压下的仿真结果,验证了基于Fuzzy-PR的矢量控制策略可以有效地保证不平衡电网电压下的DFIG的稳定运行.

To solve the problem of double frequency fluctuation between output power and DC bus voltage of traditional doubly fed wind turbine(DFIG)based on PI control strategy under unbalanced grid voltage,the mathematical models of DFIG and grid side converter under unbalanced grid voltage are established,and a vec-tor control strategy based on fuzzy proportional resonant controller(Fuzzy-PR)is proposed.The simulation model is built on Simulink platform,and the simulation results of traditional control strategy and improved control strategy under unbalanced grid voltage are analyzed and compared.It is verified that the vector control strategy based on Fuzzy-PR can effectively ensures the stable operation of DFIG under unbalanced grid voltage.