Compensation Type Improved Droop Control Based Current Sharing Method of Parallel DC-DC Converter

In order to realize the current sharing of parallel DC-DC converter under different line resistances, and to guarantee constant bus voltage and improve the power supply quality, a compensation type improved droop control strategy is proposed. Aiming at the common node voltage which cannot be accurately measured by the traditional droop method, the compensation formula is derived by using the converter output voltage and bus voltage, and the control accuracy of current sharing method of parallel DC-DC converter is improved. Due to the droop coefficient and line resistance of the converter in parallel, the bus voltage decreases, so it is necessary to increase the voltage compensation term to reduce the bus voltage deviation. Then the simulation analysis is carried out. The simulation is compared with the traditional droop method and the droop method with voltage compensation term. Finally, the simulation and experimental results are analyzed, and it is concluded that the proposed control strategy can realize the current sharing and bus voltage drop compensation of the parallel DC-DC converter, and improve the quality of power supply.