一种逆变器多环控制技术

提出了一种逆变器多环控制技术,该方案在电流环和瞬时电压环之外附加了一个重复控制环。在实现输出电压解耦和扰动电流补偿后,根据无差拍原理设计的电流环和瞬时电压环控制器使逆变器达到了很快的动态响应速度,位于外层的重复控制器则提高了稳态精度。该方案在一台基于DSPTMS320F240控制系统的PWM逆变器上得到验证。

Multiple-loop Control Technology of Inverters

In order to enhance the steady state precision and dynamic responsibility of the inverter, this paper pre-sents a multiple-loop control technology of inverters. The scheme incorporates a current loop with an instantaneous voltage loop. Besides, a repetitive control outer loop is added. Since both output voltage decoupling mechanism and load distur-bance compensation have been used, the current loop and instantaneous voltage loop controller is designed through dead-beat theory, so that the inverter can achieve very fast dynamic response. Simultaneously, the repetitive control outer loop improved the steady state performance. Experimental results show the output THD (total harmonic distortion) of inverter with multi-loop control is only 1.54%, whereas it is 4.84% without multi-loop control. The scheme is proved on a PWM inverter whose control system is based on DSP TMS320F240.