一种LCL滤波三相整流器的无传感器有源阻尼控制方法  

A Sensor-less Active Damping Control Method for Three-phase Rectifier with LCL Filter

作　　者：杨坤 宋文祥[1] YANG Kun;SONG Wenxiang(School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学机电工程与自动化学院

出　　处：《微电机》2019年第8期48-54,共7页Micromotors

基　　金：国家自然科学基金项目(51377102)

摘　　要：LCL滤波器相比于单电感滤波器,由于其较强的谐波衰减能力以及更小的电感体积,通常与整流器输出端相连,使电网电流波形更加平滑,但LCL滤波器存在固有的谐振问题,会对系统稳定运行造成不利影响。本文提出一种无传感器有源阻尼控制策略,将估计的电容电流通过比例环节引入到电压给定,进而实现有源阻尼控制。该控制方法在不增加额外传感器的情况下能很好地实现谐振抑制,降低电流总畸变率,同时增加了系统稳定性。仿真结果验证了该控制方法的可行性。Compared with single inductor filters,LCL filters are usually connected to the rectifier output due to their strong harmonic attenuation and smaller inductor volume,which makes the grid current waveform smoother.However,the inherent resonance problem of the LCL filter will affect the stability of the system.A sensorless active damping control strategy was proposed in this paper,and the observed capacitance current was introduced to the voltage reference through the proportional link,so as to achieve active damping control.This control method achieves good resonant suppression without adding additional sensors,reduces the total distortion rate of current and increases the system stability.Simulation results in Matlab/Simulink verified the effectiveness and feasibility of the control method.

关 键 词：三相PWM整流器 LCL滤波器 无源阻尼 有源阻尼 无传感器 

分 类 号：TM461[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]