A Single-phase Enhanced Grid-forming Controller with Converter Current Limiting

This paper presents a single-phase enhanced grid-forming (eGFM) controller to operate single-phase inverters in both grid-connected and standalone modes, and perform seamless transition between these two modes. The single-phase GFM converters are becoming increasingly of interest in various everyday applications. The proposed eGFM also fully addresses the following aspects: start-up synchronization, grid-reconnection synchronization, and converter current limiting. The governing equations of the proposed controller are rigorously derived, a novel method for its stability analysis and parameter design is proposed, and its performance within various operating conditions is illustrated in this paper.