摘要
针对LCL滤波器存在谐振尖锋的问题,在电流单环控制的基础上加入了有源阻尼电流环,讨论分析了逆变器侧电流环和有源阻尼电流环的电流双闭环控制方法。在电网电压具有较高的谐波干扰下,电流双环控制不能完全抑制因扰动引起的电流谐波,故提出了重复控制器与电流双闭环结合的复合控制技术。分别从系统的稳定性、扰动抑制性、收敛性和稳态误差特性几个方面对复合控制技术进行了讨论和分析。基于Matlab/Simulink平台建立了LCL型能量回馈器逆变系统的仿真模型,进行了关键参数的调试,并对输出电流谐波含量和电网电压有谐波干扰时输出电流波形的谐波含量进行了对比。研究结果表明,基于重复控制和电流双环控制的复合控制技术的能量回馈器输出的电流谐波含量更低,对外部干扰的抑制能力更好。
Aiming at the resonant peak in the current waveform which is caused by LCL-filter, a capacitor current feedback loop as the active damping was proposed to restrain it. The capacitor current loop and inverter side current loop make up the current double closed-loop control strategy. However, the harmonics in output current was not restrain by carrent double loop control. Therefore, the compound control technology based on the repetitive controller and current double loop control was used to control the energy feedback system. And the compound control technology was studied and analyzed in the stability, disturbance suppression, convergence and steady-state error characteristics of the system, the simulation model of the three-phase energy feedback system with LCL-fiher was built based on Matlab/Simulink platform. The results indicate that the compound control technology is superior than the current double-loop control through the comparison of harmonic analysis and the capacity of interference suppression.
出处
《机电工程》
CAS
2014年第11期1461-1468,共8页
Journal of Mechanical & Electrical Engineering
