基于极点配置状态反馈的PWM逆变器控制策略

Control strategy of PWM inverter based on state-observer

针对逆变电源采用数字化控制时由于时间延迟等因素导致系统稳定度降低、动态调节性能不佳的问题,基于状态空间法对脉宽调制(PWM)逆变器进行了建模,采用极点配置状态反馈控制方法,来改善系统动态性能;同时,引入状态观测器设计,提前一拍给出控制量,从而削弱了时间延迟的影响。最后,通过Matlab仿真验证了该方法的可靠性。实验结果表明,该方法大大改善了系统动态性能。

Aiming at the impact of time delay in inverters on low stabilily and poor performance, the pulse width modulation （PWM） converter based on state-space was modeled, and the state feedback method based on poles placement was adopted to improve dynamic performance of the system. Thus, the detailed design method and the necessity of state estimator was intro- duced. The state estimator was used to make the inverter achieve fast dynamic response, the influence of time delay was decreased. The experiment results indicate the reliability of this method.