基于准PR控制的单相能馈型交流电子负载研究

Study of Single-phase AC Electronic Load With Energy Feedback Based on Quasi-PR Control

针对能馈型交流电子负载传统控制精度低、动态效应差、实现难度大等问题,将准比例谐振(QPR)控制用于电流控制器的设计。首先介绍了能馈型交流电子负载的原理及结构;其次对系统整体控制方案进行了设计,模拟变换器采用单电流环控制,并网变换器采用电流内环和带二次陷波器的电压外环双闭环控制,可以准确模拟真实负载和能量单位功率因数回馈电网,达到节能的效果;最后,通过仿真和样机实验结果验证了理论的正确性。

Considering the traditional control of AC electronic load with energy feedback with its low precision, poor dynamic and the realization of difficuhies.Quasi-proportional resonant（QPR） control scheme is apphed into the current control loop.Firstly,the principle and structure of AC electronic load with energy feedback are introduced;Secondly, the control scheme of the system has been designed.Analog converter adopts a single current loop control,while grid inverter adopts the current inner loop and voltage outer loop with notch filter of double closed loop control method.It can accurately simulate the real load and realize energy feedback to power grid with unit power factor to save energy. Finally, the validity of the control theory is verified through simulation and prototype experiment.