基于双环控制的Buck DC-AC逆变器

Buck DC-AC Inverter Based on Double-Loop Control

为了提高Buck DC-AC逆变器的动态特性,改善系统的鲁棒性及抗负载扰动的能力,提出一种带电流前馈的双环控制器.该控制器采用全状态反馈的电压和电流双环控制策略,改善了逆变器系统的动态响应性能,提高了稳态性能;另外,电流前馈环的使用也使系统的抗负载扰动能力显著提高.实验结果表明,双环控制中的内环增大了逆变器控制系统的带宽,加快了逆变器的动态响应,提高了稳态精度,对负载扰动也有较高的抑制能力.

In order to improve the dynamic characteristics, robustness and anti-disturbance performance of Buck DC-AC inverters, a double-loop controller with current feedforward is presented. In this controller, the full-state feedback scheme is adopted to implement the double-loop control of voltage and current, thus improving the dynamic response as well as the steady-state performance of the inverter system. Moreover, a current feedforward loop is em- ployed to improve the anti-disturbance performance of the inverter system. Experimental results indicate that the inner loop in the double-loop controller enlarges the bandwidth of the inverter control system, quickens the dynamic response, increases the steady-state precision, and restrains the load turbulence.