基于自适应跟踪控制的三相电压型PWM整流器

Three-phase Voltage-type PWM Rectifier Based on Adaptive Tracking Control

针对三相电压型脉宽调制(pulse width modulation,PWM)整流器交流侧电感电阻、开关器件等效电阻和频率等参数不确定性带来的控制系统稳态误差较大等问题,提出一种自适应跟踪控制算法。通过对PWM整流器直接功率控制系统建模与分析,证明这类欠驱动系统符合L2-增益干扰抑制定理的条件。根据L2-增益干扰抑制定理,得出系统自适应率,并给出自适应跟踪控制算法实现过程。仿真与实验结果表明,所设计的自适应跟踪控制系统可实现PWM整流器单位功率因数控制,并具有动态响应速度快、无稳态误差等优点,特别是对于网侧等效电阻和频率的不确定性表现出很好的自适应性和鲁棒性。

Parametric uncertainties generated by switching devices’ equivalent resistance,inductive resistance and frequency of the three-phase voltage-type pulse width modulation（PWM） rectifier,have brought about large steady-state error.To cope with this problem,an adaptive tracking control for the three-phase voltage-type PWM rectifier was proposed.The modeling of the three-phase PWM rectifier was analyzed to prove that the model,which belongs to the under-actuated system,meets the conditions of the L2-gain disturbance attenuation theory,meanwhile,it acquires the adaptive law of the adaptive tracking control of the three-phase voltage-type PWM rectifier based on the L2-gain disturbance attenuation theory.Digital simulation and practical experimental results showed that the proposed method can achieve unity power factor control,fast dynamic response and zero steady-state error.It also possesses the property of good self-adaptability and robustness,especially to deal with the uncertainties of AC frequency and AC equivalent resistance.