Simple digital current control strategy for single‐phase grid‐connected converters

This study proposes a simple digital current control technique for single‐phase grid‐connected voltage source converters. Unlike conventional strategies, the proposed method does not require any proportional‐integral or proportional‐resonant controller, fictitious phase generation, reference frame transformation and decoupling network; thus, it has the advantages of simplicity and reduced computational efforts. The suggested digital technique only uses a simple proportional controller in its structure and can be directly implemented on available digital signal processors. A digital controller parameter design procedure is proposed which ensures stability and near‐zero steady‐state error under all circumstances. Simulation and experimental results confirm that the proposed technique provides a fast and accurate current tracking with minimum harmonic distortions.