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Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
Due to the structural design of the traditional matrix converter, the voltage transfer ratio is limited to 0.866. In this paper, we purposed a new one-step boost type matrix converter, which can change the voltage transfer ratio variable from the perspective of changing the topological structure. The topological structure of one-step boost type matrix converter not only improved the voltage transfer...
This study presents an optimization control strategy to improve the ride-through capability of voltage source converter-based high voltage direct current (VSC-HVDC) systems under unbalanced network conditions. To facilitate simple implementation and flexible operation, the current references are derived and synthesized into one generalized equation that introduces two individually adaptable parameters...
In order to improve the input impedance of stacked boost converter (SBC) that processes only a part of the total power delivery, the traditional three-capacitor structure is optimized as single-capacitor structure in this paper. Then small signal models of push-pull SBC based on these two capacitor structures are set up, the loop gain and input impedance are analyzed and compared. Finally, the effectiveness...
Self-power emitter turn-off thyristor (SPETO) is a high power switching device which could provide power for its gate drive during operation. Self-power function reduces the system cost and makes the mechanical structure compact, whereas it may bring extra harmonic when SPETO is being utilized in power utilities. In this paper, the impact of self-power function on extra harmonic is analyzed. The ideas...
This paper presents a 10 MVA multilevel inverter for the application of static synchronous compensator (STATCOM). Emitter turn-off (ETO) thyristors are used as active switching devices in the inverter. The cascade multilevel inverter is based on ETO light H-bridge building block (HBBB). The technology innovations of ETO simplify the HBBB construction. Air-cooled heat pipes also decrease the cost and...
This paper proposes a new practical modular power converter, combining with the new power electronics technologies: the emerging emitter turn-off (ETO) thyristor device, modular voltage source converter and digital control technology. A modularized ETO based power converter with digital local controller is designed and developed. Comparing with the conventional power converter, the proposed power...
This paper illustrates a study on HVDC light for its enhancement of AC/DC hybrid transmission system and multi-infeed HVDC system. In the sense of the realizing independent controlling of active and reactive power, HVDC light is more effective compared to the conventional HVDC system. An AC/DC parallel transmission system and a three-infeed HVDC system are modeled using PSCAD/EMTDC. Simulations corresponding...
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