DC-AC逆变器分数阶与整数阶PID控制对比

A Comparative Study of DC-AC Inverters Controlled by Fractional-Order and Integer-Order PID Controllers

针对传统双环PID控制三相逆变器系统存在输出电压质量和鲁棒性不够理想,输出电压谐波含有率较高等问题,设计基于神经网络参数自整定的分数阶PIλDμ双环控制器:PIλDμ电流内环PIλDμ电压外环控制、PIλDμ电流内环PID电压外环控制和PID电流内环PIλDμ电压外环控制,并应用于不同的线性及非线性负载,考察其控制性能。仿真研究表明,分数阶PIλDμ电流内环整数阶PID电压外环控制性能最好,其次是整数阶PID电流内环分数阶PIλDμ电压外环控制和分数阶PIλDμ电流内环分数阶PIλDμ电压外环控制,性能最差的是传统的双环PID控制。

The voltage quality and robustness of traditional three-phase inverters with double-loop PID controller are not ideal and total harmonic distortion(THD)of the voltage is high.For these reasons,the parameter self-tuning fractional-order PIλDμcontrollers based on neural network are designed and applied to different linear and nonlinear loads in order to test their performance.The simulation results show that the performance of the inverter designed with fractional-order PIλDμcurrent inner loop and integer-order PID voltage outer loop controller is the best,followed by the integer-order PID current inner loop and fractional-order PIλDμvoltage outer loop controller and the fractional-order PIλDμcurrent inner loop and fractional-order PIλDμvoltage outer loop controller—much better than the traditional design with double loop PID controller.