DSP Control Method of Single-phase Inverters for UPS Applications

The paper presents a new deadbeat controller with repetitive integral action suitable to uninterruptible power supply (UPS). Its aim is to achieve a deadbeat dynamic response for the controlled variables (output voltage and inverter current). As a result of the repetitive action, the controller also can reduce the steady-state error and distortions caused by unknown periodic disturbances usually resulted from the input source and output load. Moreover its design is extremely simple and requires only a reasonably accurate knowledge of the output filter parameters. The validity of the proposed strategy is implemented on a DSP controller (TMS320LF2407) and tested on a 3.75 KVA inverter.