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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。
According to the actual working conditions of small power variable wind speed wind power generation system, the SRG DC wind power micro-power supply based on self-excited power generation mode is designed using SRG with unique structure and flexible control. Based on the working characteristics of SRG power generation operation, the natural output characteristics are analyzed to find out SRG output voltage ripple causes, a reasonable choice of voltage feedback regulator type and parameters, the output voltage closed-loop control, the output voltage stability; and on the basis of SRG output capacitor filter is optimized to effectively suppress the output voltage ripple. On the Matlab simulation platform, SRG nonlinear mathematical model is set up, and wind speed simulation module, wind turbine simulation module, current chopping module and voltage feedback regulator are set up to build SRG DC micro wind power simulation model. The simulation results show that, The output voltage is closed-loop controlled, and the integrated capacitor filter is optimized. Under different wind driven, the SRG DC wind power micro-power supply can output stable voltage and improve the power quality of distributed power generation micro-power in the smart grid.