基于滑模观测器无位置控制的PWM整流技术

PWM Rectification Technology Based on Sliding Mode Observer Sensorless Control

传统永磁同步发电机PWM整流技术通常采用机械式传感器获取准确的位置角度信息,但机械式传感器的安装会增加系统成本,其本身性能易受外界环境变化影响,从而导致系统的可靠性降低。在分析永磁同步发电机的双闭环前馈解耦控制方法后,提出了一种基于滑模观测器法的无位置控制策略。通过在每个PWM周期的电压电流值采用滑模观测器法对反电动势进行估计,从而利用锁相环确定其转子位置。仿真与实验结果均证明所提方法能正确有效地估计转子位置角,并使整流系统输出符合标准的电压波形。

The traditional PWM rectification technology for permanent magnet synchronous generators usually uses optical encoders to obtain accurate position and angle information.However,the installation of optical encoders will increase system costs,and their performance is susceptible to changes in the external environment,resulting in reduced reliability of the system.Combing the analysis on basic control methods for power generation systems,the sensorless control strategy based on sliding mode observer method was proposed.The back electromotive force can be estimated by the sliding mode observer from voltage and current values of each PWM cycle.And the rotor position was determined by the phase locked loop.Both simulation and experimental results demonstrate that the proposed method can accurately and effectively estimate the rotor position angle and output a voltage waveform that meets the standard.