Parallel operation of electronic power transformer based on distributed logic control

An ac/dc hybrid parallel operation control scheme of EPT based on distributed logic control is proposed in order to eliminate circulation current and further improve redundancy performance in this paper. The proposed ac/dc hybrid parallel operation control scheme consists of a dc side current-sharing control scheme and an ac side current-sharing control scheme. The realization of current-sharing no matter in the ac side or in the dc side is based upon instantaneous average current method. Detailed computer simulations based on MATLAB/SIMULINK for the two EPTs parallel operation is conducted, and this parallel system is also implemented in laboratory based on DSP TMS320F2812. Simulation results and experimental results show that the proposed control scheme has good current-sharing performance under both steady-state and dynamic operation.