基于干扰观测器的PI控制单相逆变器

摘要

采用了一种基于干扰观测器的PI控制单相逆变器的控制方案,即通过干扰观测器在控制策略中引入等效的补偿,实现对该干扰完全抑制. 对该控制策略与传统的PI控制均进行了全面的理论分析与设计,在MAT-LAB中对该系统进行了仿真研究,并在基于DSP的单相逆变器平台上采用数字控制算法实现该控制方案. 仿真结果与实验结果均表明,与传统的PI控制相比该控制方案能获得更好的动、稳态性能,具有更好的谐波抑制能力,从而验证了理论分析的正确性,并对别的系统设计具有一定的参考性.%The paper proposed a control strategy of single-phase inverter controlled by PI controller based on disturb-ance observer, namely the interference is completely suppressed by the equivalent compensation which is bring into the controller by the disturbance observer.The comprehensive analysis of this control strategy and the traditional PI control is given in theory, and the system is studied in MATLAB , besides, the control scheme is achieved in the sin-gle phase inverter platform based on DSP by using digital control algorithm.The simulation and experimental results prove that the proposed strategy can achieve better dynamic and steady-state performance and have better ability of harmonic suppression compared with the traditional PI control, thus verifying the validity of the theoretical analysis, and giving a certain reference to other systematic designs.