SRG直流风力微电源输出电压稳定控制

Control of Voltage Stability for SRG Wind Power DC Micro-resource

针对小功率变风速风力发电系统实际工况,选用结构独特、控制灵活的SRG,设计基于自励发电模式的SRG直流风力微电源;根据SRG发电运行的工作特点,分析其自然输出特性,找出SRG输出电压纹波产生原因,合理选择电压反馈调节器类型及参数,对输出电压进行闭环控制,稳定输出电压;并在此基础上优化SRG输出电容滤波器,有效抑制输出电压脉动。在Matlab仿真平台上,搭建SRG非线性数学模型,构建风速模拟模块、风力机模拟模块、电流斩波模块和电压反馈调节器等,组建SRG直流风力微电源仿真模型,仿真实验结果表明,通过对输出电压进行闭环控制,综合优化的电容滤波器,在不同风力驱动下,SRG直流风力微电源都能输出稳定的电压,提高智能电网中分布式发电微电源的电能质量。

To meet the practical requirements in low-power wind power generation system,the structural characteristics and unique principle of SRG is used,and the self-excited mode is selected.Then SRG wind power DC micro-resource is designed.According to the work principle and natural output features of SRG,the causes of output voltage ripple can be analysed.The voltage feedback regulator is rational designed;The output voltage closed-loop controlor of the SRG is achieved and the capacitor filters is optimized.Based on Matlab/simulink,the simulation model of SRG wind power DC micro-resource has been built,such as the non-linear mathematical model of SRG,the wind speed model,the wind turbine model,the current chopping model and the voltage feedback controlor model,etc. Simulation results show that the output voltage closed-loop controlor,the optimized capacitor filters,a stable output voltage of SRG wind power DC micro-resource can be got in different wind-driven,and the power quality of grid in new energy micro-power generation system can be improved.