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This paper focuses a novel Zero Current Switched (ZCS) back-to-back current source converter for high power applications. A single DC link auxiliary circuit with a new commutation scheme helps to achieve soft switching for rectifier, inverter side and auxiliary switches. Two different switching algorithm (namely, Type-I and Type-II) are proposed depending upon the relative switching instants of rectifier...
A new space vector modulation method for common-mode voltage reduction in four-level nested neutral point clamped (NNPC) inverter is proposed in this paper. The proposed method employs switching states with minimal absolute common-mode voltages to synthesize given reference vectors. A variety of virtual vectors are constructed to facilitate the synthesis. The effect of dead time on common-mode voltage...
A simple flying-capacitor voltage balancing method for nested neutral point clamped (NNPC) inverter is proposed in this paper. The NNPC inverter is a newly developed four-level voltage source inverter (VSI) with new topology. There are two flying-capacitors in series in each leg in the NNPC inverter. The voltage across each capacitor should be controlled to balance at one-third of DC bus voltage to...
The multi-modular matrix converters (MMMCs) constructed with three-phase to single-phase matrix converter modules have emerged as a viable topology candidate for high-power applications. Due to the three-to-two module structure and elimination of dc components, modulation scheme design for the MMMCs is not straightforward at first glance. This paper presents a three-level space vector modulation (SVM)...
In a current source converter (CSC) based wind energy system, the dc link current plays an important role in determining the system dynamic performance. This paper proposes two control strategies that can be used to improve the dynamic performance of the dc link current in a CSC wind energy system using permanent magnet synchronous machine (PMSM). State space equations and small-signal models of the...
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