Abstract：Alternate arm multilevel converter (A2MC) is a new voltage source converter topology which is suitable for high voltage direct current transmission(VSC-HVDC).This paper presents an improved phase disposition pulse width modulation suited for full-bridge cells in this topology.Compared to conventional carrier phase-shifted PWM,this modulation method is more easily to be realized and increase the robustness of system,the computation burden is also reduced.This method can be transfer to any other full bridge cells cascaded structure.Simulation and experimental results demonstrate the simplicity and effectiveness of this new type of modulation strategy.
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2016, Vol. 31 
