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Traditional seven-level Active Neutral-point-clamped (ANPC-7L) converters suffer from the problems of dynamic voltage balancing in series switches and multi voltage levels jumping of phase output voltage during switching status transition. This paper presents a novel ANPC-7L topology with auxiliary commutating branches and elaborates on its commutating strategies. The presented topology and its commutating...
This paper introduces seven-level Active Neutral-point-clamped (ANPC-7L) inverter first. Then, the paper decouples the two problems of floating capacitors voltage controlling and neutral-point potential balancing by using the concept of average state, proposes a novel neutral-point potential balancing model based on zero-sequence voltage injection. After that, two neutral-point potential balancing...
Modular Multilevel Converter (MMC) is mainly used in the high frequency field especially in the HVDC system. This contribution presents a control strategy of modular multilevel converter, which allows the converters to feed the three-phase machine from 0Hz to 50Hz. Experiments are provided and the drive system has a good performance.
This paper proposes a novel PWM strategy for three-level active neutral-point-clamped (ANPC) converter, this strategy can balance the power losses of all semiconductors and eliminate the fluctuation in the neutral point voltage over full range of converter output voltage and for all load power factors of ANPC converter. The performance of this modulation approach and its benefits are verified through...
By now the modular multilevel converter (MMC) is mainly applied to high frequency applications (50 or 60Hz) especially in the field of HVDC systems. This paper presents a control scheme for modular multilevel converter, which allows the converter to operate at continuous coverage in the 0Hz to 50Hz frequency band.
A high performance controller with effective voltage balance regulation is proposed for a cascade STATtic synchronous COMpensator(STATCOM) with star configuration. Zero-sequence voltages are injected to the output voltages of STATCOM in order to compensate the unblanced load currents, which can also decouple the star-connected three-phase STATCOM system into three single-phase systems. Additionally,...
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