SRG风力发电系统最大功率跟踪控制研究

Research on MPPT control for SRG wind power generation system

以8/6极开关磁阻发电机(SRG)为例,基于电机的非线性特性提出一种基于模糊PI控制器的改进型转速反馈最大功率跟踪策略:通过SRG转速及其变化率,确定模糊规则自行整定PI参数,调节励磁电流,控制电机输出功率,使系统运行于最佳工作点。在Matlab平台上搭建基于最大功率跟踪策略的SRG系统仿真模型,仿真结果表明:外界风速稳定时,SRG转速和输出功率均可平稳保持在理论最佳值;风速变化时,SRG系统可快速实现自寻优,具备良好的动静态性能,验证了SRG仿真模型的正确性和控制策略的可靠性。

Taking the Switched Reluctance Generator （SRG） with 8 stator poles ＆ 6 rotor poles for example, considering the nonlinear characteristics of SRG, a developed rotational speed feedback control strategy based on fuzzy PI controller for maximum power point tracking （MPPT） was presented. The parameters for PI were adjusted and the excitation current was regulated automatically by comprehensive judgments of rotational speed and its error signal to control output electric power of the SRG machine, to optimize the mechanical power of wind turbine. The system operation capability could be improved. Simulation models of SRG wind power system with proposed MPPT control scheme proposed were established based on MATLAB platform. The results show the correctness of SRG nonlinear models and reliability of the MPPT algorithm, showing that SRG outputs could follow the theoretical maximum values at stable conditions or variable working situation, therefore excellent static and dynamic performances could be obtained.