【摘要】 为分析基于LCL滤波器的双馈风电网侧变换器在不同电流反馈控制结构情况下的工作性能,采取PI控制器对网侧变换器网侧电流反馈控制结构和变换器侧电流反馈控制结构的电流闭环根轨迹进行分析,对其在理想电网无阻尼电阻和有阻尼电阻、非理想电网无阻尼电阻3种情况下的特性进行了比较。分析及仿真结果表明变换器侧电流反馈控制结构控制算法相对较复杂,但是系统稳定性好,电网电流的谐波畸变率较低;而电网侧电流反馈控制结构较易实现网侧单位功率因数控制,但稳定性较差。更多还原

【Abstract】 To analyze performance of grid-side converter with LCL filter for doubly-fed wind power system under different current control structures,root locus of closed current loop with grid-side current feedback or converter-side current control structure has been separately analyzed.It compares performances of different current control structures,presents their performances under cases for ideal grid without filter damping,non-ideal grid without filter damping and ideal grid with filter damping.Analysis and simulation results show that it has less harmonic current and better stability with converter-side current feedback control structure than that with grid-side current feedback control structure,but with the latter structure it is simpler and easier to realize unity power factor control.更多还原