LCL型PWM整流器的稳定器设计

The design of stabilizer for LCL type PWM rectifier

相比于传统L滤波器,LCL滤波器通过使用较小的电感元件,能够有效减少开关谐波及保证低电流总谐波失真。然而,由LCL滤波器引入的额外极点易引起系统谐振,从而导致系统不稳定。为处理以上矛盾,依据李雅普诺夫理论构建一个反馈稳定器,将其引入控制系统,并利用Matlab的Simulink工具箱对相应模型进行仿真。仿真结果表明,该稳定器引入PWM整流器后,系统谐振得到有效抑制,谐波含量明显减少,系统稳定性提高。

Compared with the traditional L filter, the LCL filter can effectively reduce the harmonic and guarantee the low current total harmonic distortion by using smaller inductance components. However, the additional pole introduced by the LCL filter will cause system resonance and then lead to instability of the system. To deal with the above contradictions, a feedback stabilizer is constructed based on Lyapunov theory and introduced into the control system, and the corresponding model is simulated by using Simulink toolbox of Matlab. The results show that after the stabilizer is introduced to the PWM rectifier, the system resonance is effectively suppressed, the harmonic content is reduced, and the stability of the system is improved.