一种高性能的单相逆变器多环控制方案

提出了一种高性能的单相逆变器控制策略.该方案在电压电流双闭环控制基础上增加了外层的重复控制器.在实现输出电压解耦和扰动电流补偿后,电压外环采用比例积分环节,电流内环采用比例环节的控制器.理论分析证明在这种双环结构下,可以实现任意配置闭环极点,因而使逆变器达到了很快的响应速度及较好的稳态精度.位于内层的双环瞬时控制器改善了系统的动态特性,位于外层的重复控制器提高了稳态精度及抗非线性负载扰动的能力,两种控制器各司其职,互为补充,为单相逆变器波形控制提供了一种接近完美的控制方案.最后在一台基于DSP TMS320F240的单相PWM逆变器实验装置上验证了该控制方案的正确性.

A High Precision Multi-Loop Control Strategy for Single-Phase PWM Inverters

A high-performance single-phase inverter control strategy, which incorporates an inner dual-loop controller and an outer repetitive controller, is proposed in the paper. A PI voltage control and a P current control are adopted in the dual-loop after output voltage decoupling and load current disturbance compensation. The proposed dual-loop controller can realize arbitrary pole placement of the control system, and thus fast dynamic characteristic and good steady state accuracy are achieved. A repetitive controller is added aiming to improve the ability to suppress nonlinear load disturbance and the steady state accuracy. With the cooperation of both controllers, the overall control scheme provides a near perfect solution for inverter control and experiment results substantiate the proposed control strategy.