一种有源滤波器的PWM变换器优化控制方法

An Optimal Control Method of PWM Converters for Active Power Filters

有源滤波器PWM变换器具有延迟环节,难以实现优化控制.分析了PWM变换器的PID控制原理及其无法实现优化控制的原因,指出了实现的方法、条件并建立相应的数学模型.总结出一类时滞系统状态观测器的统一表达式和ITAE优化控制律.根据PWM变换器的特点,提出了将ITAE优化控制律和PID控制器结合实现对PWM变换器的优化控制的方法.MATLAB仿真结果表明,ITAE优化后的控制器能够快速跟踪信号,具有相对其他优化方法更好的动态性能.

The PWM converter of an active power filter has a time-delay link, thus making it difficult to be controlled optimally. Analyzes the PID control principle and the reason why the PWM converter is unable to implement the optimal control, and proposes the way and conditions to realize optimal control with a mathematical model developed correspondingly. A general expression of the state observers to a class of time-delay system is given as well as the ITAE optimal control law. The method combining the ITAE optimal control law with PID controller to realize the PWM converter＇ s optimization control is therefore proposed according to the PWM converter＇s characteristics. The MATLAB simulation results indicated that the controller can trace signal quickly after ITAE optimization and has better dynamic performance than other optimal methods.