扩张状态观测器在电压型PWM整流器中的应用

Application of extended state observer to PWM rectifier

电压型PWM整流器受交流侧参数不平衡、直流侧电容等效阻抗等因素的影响,引起直流电压波动,目前还没有太好的解决办法。针对上述情况,把各种因素视为未知扰动,利用扩张状态观测器进行观测。为获得稳定的直流电压输出,提出了基于扩张状态观测器电压型PWM整流器的控制策略。该策略既能对未知扰动进行补偿控制,又能改善交流侧交流电流波形。通过建立基于扩张状态观测器电压型PWM整流器控制系统Simulink仿真模型,对在交流侧三相参数不平衡和直流侧电容等效阻抗的电压型PWM整流器性能进行了仿真研究。仿真结果表明提出的控制策略是可行的。

No effective method at present can be used to overcome the influence of the AC side parameter imbalance and DC side Equivalent Series Resistance （ESR） on voltage-type PWM rectifier DC output voltage. In order to solve the problem, all the unknown factors are regarded as unknown disturbance, and the Extended state observer is applied. The control strategy can observe and compensate for unknown disturbance and can also improve AC side current waveform. Simulation Research is made on PWM rectifier with the AC side parameter imbalance and DC side Equivalent Series Resistance（ESR） by establishing the Simulink model that ESO is used in voltage-type PWM rectifier. The result shows the control strategy proposed in this paper is feasible.