基于电感电压反馈和输入整形技术的LC滤波器混合阻尼控制

电流型PWM整流器采用LC环节来滤除谐波及帮助器件换流,LC型滤波器呈二阶特性,存在谐振尖峰,且电容阻尼较小,在控制系统存在扰动的情况下,容易引起电流波形畸变和振荡。提出了一种采用输入整形技术和电感电压反馈结合的控制策略,输入整形技术能够有效地抑制小阻尼系统的振荡,电感电压反馈控制能够在外部干扰抑制网侧电流波形畸变。结合两者的优点,可有效地解决电流型脉宽调制整流器网侧电流振荡和畸变。仿真验证了所提出的控制策略能够有效减少电流畸变,增加系统的稳定性,并具有一定工程实用性。

Hybrid damping control based on the LC filter inductor voltage feedback and input shaping techniques

Current PWM rectifier links in the network side using LC devices help filter harmonics and commutation, LC type filter has second order characteristics, the presence of the resonance peak and the resistor of capacitance is also very small, which is easy to cause the current waveform distortion in the transient process or in steady-state oscillation in the case of the presence of the control system disturbances. This paper presents a control strategy using input shaping techniques and combining inductive voltage feedback, which can effectively inhibit distortion and vibration caused by LC links under the external interference or current command change. Input shaping technique can effectively suppress the vibration of small damping system, inductor voltage feedback control can suppress side current waveform distortion in the external interference. This paper combining the both advantages can effectively solve the current mode pulse width modulation rectifier side current oscillations and distortion. The performance of the proposed method is verified by simulation and experimental results, distortion of the line current is effectively reduced and the stability of the system is improved.