Hybrid current control of three-phase grid-connected converter for marine current power generation system

This paper aims to analyze the applied hybrid controlled three-phase grid-connected inverter for marine current power generation system used in distributed generation. As inverter is a key part of the grid-based system, grid-connected technology plays an important role in the distributed generation to meet the stricter grid interconnection standards. In order to improve the power quality and strengthen the stability and reliability of the grid-based system, a hybrid control scheme based on PI control and repetitive control (RC) implemented in the synchronous reference frame (SRF) is presented by feeding back the inverter side current. In addition, this paper gives an analysis of stability, steady-state tracking error, and dynamic response respectively in frequency domain and time domain. Consequently, hybrid control scheme shows better dynamic response and can effectively eliminate the harmonics of output currents in theory. Finally, a 3 kW experimental prototype of three-phase CC-VSI is established on dSPACE5202 real-time platform to evaluate the performance of the proposed control scheme.