自抗扰控制器在电压型PWM整流器中的应用

Active Disturbance Rejection Controller for PWM Rectifier

为了抑制PWM整流器负载扰动对直流侧输出电压产生的影响,提出将自抗扰控制器引入基于电压定向的直接功率控制三相电压型PWM整流器中的电压控制方案.将负载扰动归到未知扰动中,用扩张状态观测器对负载扰动进行观测和补偿,结合自抗扰控制器进行电压外环控制,并与模糊PID控制进行了仿真对比.仿真结果表明,该方法能够快速、无超调对输出电压进行控制,实现了单位功率因数运行,并能有效抑制负载变化的影响.

To suppress the influence of PWM voltage source rectifier DC output voltage on the load changes, active disturbance rejection controller（ADRC） for PWM rectifier voltage loop is proposed. The load-disturbances are all contributed to the total disturbances and extended state observer（ESO） is used to estimate, compensate and control the total disturbances. Simulation results showed that the proposed method can achieve high power factor, low harmonic, and fine dynamic performance. It has better robust property to load-disturbance than fuzzy PID.