The Designment Of The Inverter On Basis Of Repetitive Algorithm

The pulsewidth modulation(PWM) inverters that are used to convert DC voltage to constant-frequency constant-voltage sine wave voltage are widely employed in uninterrupted power supply and other industry facilities .Nonlinear loads and parameter uncertainties , causing periodic tracking error ,are major sources of THD in AC power systems . In this paper ,a plug-in digital Repetitive control scheme is proposed for single-phase sine wave pulsewidth modulation inverter to achieve high quality output voltages, hi the control scheme ,,the repetitive controller is plugged into the stable single-phase inverter, the plug-in repetitive controller is designed to eliminate periodic disturbance and track periodic reference signal with zero tracking error, the design theory of plug-in repetitive controller is described systematically and the stability analysis of overall system and system error is discussed .on basis of the sys the hardware of the inverter with the digital signal processor TMS320F240 , and the software of the system are designed, and so all, the merits of the controlled system includes the features of harmonics distortion, robustness to parameters uncertainties ,simple hardware design and simple control algorithm and simple software design, simulation and some results are provided to illustrate the effectiveness of the proposed scheme.