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Four-level hybrid-clamped (4L-HC) converter is a newly proposed topology which is suitable for high-performance medium-voltage drives. Zero-sequence voltage (ZSV) is commonly used to balance the DC-link capacitor voltages of this topology and then the common-mode voltage (CMV) is also affected. This paper proposes a CMV reduction method for a back-to-back 4L-HC converter. The relationship of CMV and...
Four-level hybrid-clamped (4L-HC) inverter is a newly proposed topology which is suitable for high-performance medium-voltage drives. This paper proposes a multi-objective optimization strategy for this 4L-HC inverter. The central DC-link capacitor and flying capacitor voltages are regulated by a modified phase-shifted PWM. The upper and lower capacitor voltages are balanced by zero-sequence voltage...
In this paper a new five-level hybrid-clamped converter with reduced number of clamping devices is introduced. Only two active switches and two flying capacitors are used for clamping per phase. The operating method is introduced and phase-shifted pulse width modulation (PS-PWM) is used to control this converter. A detailed analysis of the average currents through the flying capacitors and neutral...
This paper describes a modified phase-shifted carrier-based pulsewidth-modulation (PSC-PWM) scheme for modular multilevel converters (MMC). In order to reduce the average device switching frequency, a reduced switching-frequency (RSF) voltage balancing algorithm is developed. This paper also proposes a circulating current suppressing controller (CCSC) to minimize the inner circulating current in an...
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