基于H∞和L2干扰抑制的PWM整流器双闭环控制

Double closed-loop control of PWM rectifier based on H_∞ and L_2 disturbance suppression

为了解决模型不确定和外部干扰对PWM整流器稳定控制的影响,提出了基于H_∞和非线性L_2干扰抑制控制的双闭环控制方法。电压外环以电压偏差和功率偏差构建布鲁诺夫斯基标准型,基于目标全息控制方法,得出了线性最优控制解。电流内环采用非线性L_2增益控制方式,有效抑制了由模型参数不确定和外部干扰对大范围运行稳定性的影响。仿真验证和实验结果表明:相对于传统的比例积分控制方法,新的控制方法可以明显加快整流输出电压的稳定速度和单位功率因数的电流跟踪能力,对于提高PWM整流器动态稳定控制能力具有重要意义。

To reduce the influence on the stability control of the PWM rectifier caused by model uncertainty and external interference, a new double closed-loop control method based on H∞ and nonlinear L2 disturbance suppression is proposed. In the voltage outer control loop, Bruno-standard linear equation is established based on voltage derivation and power derivation, and the linear optimal control solution is obtained based on objective holographic feedbacks. In the current inner control loop, the nonlinear L2-gain control method is used, which effectively restrains the influence on the wide-range operation stability due to aforementioned reasons. Simulation and experiment results show that the new control method can quicken the stability speed of rectifier output voltage and current tracking ability of unity power factor significantly compared with traditional proportional integral control method, which is important to improve the dynamic stable and control ability of PWM rectifier,