Distributed Auxiliary Inverter of Urban Rail Train—Load Sharing Control Strategy Under Complicated Operation Condition


Paralleling is the event tendency of the auxiliary inverter. This paper analyzes the issues of the parallel process intimately. First, for inherent contraction between voltage regulation performance and current sharing performance, the paper adopts the resistive droop methodology. Second, the paper improves dynamic performance and reliability of the droop technique by improving power calculation and introducing the whole cycle adaptive droop method. Third, so as to unravel the unshared current problem caused by inconsistent parameters, the paper will increase active power proportion droop coefficient, and introduces voltage compensation strategy to compensate voltage drop caused by increased proportion droop coefficient. Fourth, the auxiliary parallel system has sophisticated load characteristics; the paper proposes voltage compensation strategy to compensate voltage drop caused by the pump load. This paper utilizes three-section total reactive power to droop frequency and active power of each phase to droop amplitude, unbalanced current will be shared. This paper introduces special virtual impedance technology to unravel the harmonic current sharing drawback caused by the nonlinear load. Finally, the effectiveness of higher than theory is totally verified by simulation and experiment.

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