摘要
LCL滤波器因较好的高频谐波衰减特性而被广泛应用于并网逆变系统中,然而LCL滤波器存在的谐振尖峰易导致并网逆变器不稳定。针对该问题,采用基于陷波器校正的有源阻尼控制策略,并通过"劳斯稳定判据+最优PI控制器设计"方法,确定优化后的控制器参数。该方法实现简单,在不增加传感器数量的前提下,可以有效地抑制LCL滤波器的谐振尖峰,提高系统的响应速度及稳定性。理论分析和仿真研究表明该方法是有效可行的。
LCL filter is widely used in grid-connected inverter because of its good high frequency harmonic attenuation characteristic.However,the resonance spike of LCL filter easily leads to the instability of grid-connected inverter.In order to solve this problem,the active damping control strategy based on notch filter correction is adopted,and the optimized controller parameters are determined by"Routh stability criterion+optimal PID controller design".This method is simple to realize.Without increasing the number of sensors,it can effectively suppress the resonance spike of LCL filter and improve the response speed and stability of the system.Theoretical analysis and simulation results show that the method is effective and feasible.
作者
张计科
王美臣
ZHANG Ji-ke;WANG Mei-chen(School of Electric Power,Inner Mongolia University of Technology,Hohhot 010080,China;Inner Mongolia Key Laboratory of Electromechanical Control,Hohhot 010080,China)
出处
《机械工程与自动化》
2020年第5期29-31,35,共4页
Mechanical Engineering & Automation
关键词
光伏并网逆变器
LCL滤波器
陷波器
有源阻尼控制策略
photovoltaic grid-connected inverter
LCL filter
notch filter
active damping control strategy
