基于双滞环空间矢量控制的电动机电子负载的研究

Study on motor electronic load based on double hysteresis space vector control

本文提出一种能量回馈式交流电子负载,主电路采用两个电压型PWM变换器构成的AC/DC/AC结构.前级PWM变换器实现异步电动机模拟功能,采用改进双滞环空间矢量控制方式,并进行预测来计算误差电流.后级PWM变换器实现能量回馈,采用电压外环、电流内环的双闭环控制方式,并结合模糊控制实现单位功率因数逆变.仿真结果表明,设计的电子负载可以对电动机动态特性精确模拟,具有较好的动态性能和抗干扰能力,并使能量以单位功率因数回馈电网,节约电能.

This paper proposes an energy feedback type electronic load. The main circuit adopts the structure of AC /DC /AC which consists of two voltage type PWM converter. The first level PWM converter is used to simulate a asynchronous motor under the improved double hysteresis space vector control. Forecast is used to calculation error current. The second level PWM converter,that uses double closed loop control method and combined with fuzzy control,achieves unite power factor energy feedback function. The simulation results show that the system can accurately simulate the dynamic characteristics of the motor and has good dynamic performance and anti-interference ability. Besides,the system can make the energy back to the grid with unit power factor.