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Hybrid multilevel power conversion system: a competitive solution for high-power applications

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3 Author(s)
Manjrekar, M.D. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Steimer, P.K. ; Lipo, T.A.

Trends in power semiconductor technology indicate a tradeoff in the selection of power devices in terms of switching frequency and voltage-sustaining capability. New power converter topologies permit modular realization of multilevel inverters using a hybrid approach involving integrated gate commutated thyristors (IGCTs) and insulated gate bipolar transistors (IGBTs) operating in synergism. This paper investigates a hybrid multilevel power conversion system typically suitable for high-performance high-power applications. This system, designed for a 4.16 kV⩾100 hp load is comprised of a hybrid seven-level inverter, a diode bridge rectifier, and an IGBT rectifier per phase. The IGBT rectifier is used on the utility side as a real power flow regulator to the low-voltage converter and as a harmonic compensator for the high-voltage converter. The hybrid seven-level inverter on the load side consists of a high-voltage slow-switching IGCT inverter and a low-voltage fast-switching IGBT inverter. By employing different devices under different operating conditions, it is shown that one can optimize the power conversion capability of the entire system. A detailed analysis of a novel hybrid modulation technique for the inverter, which incorporates stepped synthesis in conjunction with variable pulsewidth of the consecutive steps is included. In addition, performance of a multilevel current-regulated delta modulator as applied to the single-phase full-bridge IGBT rectifier is discussed. Detailed computer simulations accompanied with experimental verification are presented in the paper

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Industry Applications, IEEE Transactions on  (Volume:36 ,  Issue: 3 )