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This paper proposes a method to reduce the low-frequency neutral-point voltage oscillations. The neutral-point voltage oscillations are considerably reduced by adding a time-offset to the three phase turn-on times. The proper time-offset is simply calculated considering the phase currents and dwell time of small and medium voltage vectors. The proposed method does not affect the outputs and there...
In this contribution, we investigate the possibility of eliminating the crowbar circuit which is normally used to protect the auxiliary railway supply system in case of a catenary transient overvoltage. The idea is to act at the control level by suspending the operation of the auxiliary inverter when the input voltage reaches some given threshold. Experimental results are firstly presented for an...
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