基于龙伯格观测器的变频一体机谐波电流抑制控制

Harmonic Current Suppression Control of Variable Frequency Integrated Motor Based on Luenberger Observer

针对无速度传感器高品质矢量控制在变频一体机中的应用,在龙伯格观测器基础上,设计改进的反馈增益矩阵,保证转子磁链观测和转速估算收敛速度的同时,又兼具低频区电机转速观测的稳定性。针对大负载工况中间母线电压波动引起的电机端电流谐振问题,设计自适应谐振控制器,通过电机端电流中谐波幅值实时调整谐振调节器补偿量,实现了电机端电流中特定频率谐波的无静差控制及良好的动态性能。仿真和电机对拖实验验证了该控制策略的有效性。

For the application of high quality vector control without speed sensor in the variable frequency integrated motor,an improved feedback gain matrix was designed based on the Luenberger observer to ensure the convergence speed of rotor flux observation and speed estimation,as well as the stability of low-frequency motor speed estimation. Aiming at the motor harmonic current caused by the voltage fluctuation of the middle bus under the condition of large load,an adaptive resonance controller was designed. The compensation of the resonance regulator was adjusted in real time by the harmonic amplitude value in the motor current,realizing the control without static difference of the specific frequency harmonic in the motor current,and has good dynamic performance. The effectiveness of the control strategy is verified by simulation and motor drive system.