Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1999-02-12
1999-12-21
Nguyen, Matthew
Electric power conversion systems
Current conversion
Having plural converters for single conversion
H02M 7537
Patent
active
060057882
ABSTRACT:
The present invention provides a multilevel electric power converter including a plurality of DC voltage sources providing different DC source voltage levels. The DC source voltage levels are preferably multiples of each other and may vary in a binary fashion or in a geometric progression with a factor of three to provide a large number of output voltage levels for a given number of inverter levels. The multilevel inverter is preferably implemented as a series connected set of H-bridge inverters, with each H-bridge inverter having an independent DC voltage source providing the desired DC source voltage level. A hybrid modulation strategy may be employed whereby the lowest voltage level inverter is modulated at a high frequency, e.g., by pulse width modulation, and higher voltage level inverters in the multilevel inverter are modulated to provide a low frequency stepped waveform. The combined high frequency pulse width modulated and low frequency stepped waveform has good spectral quality. A high voltage high quality waveform may be generated in this manner by taking advantage of the high voltage blocking capability of switching devices, such as GTO thyristors, in the high voltage inverters in the multilevel inverter, and the high frequency switching characteristics of switching devices, such as IGBTs, in the lowest voltage level inverter in the multilevel inverter. A multilevel inverter in accordance with the present invention may be employed in a single-phase or multi-phase applications.
REFERENCES:
patent: 4814963 (1989-03-01), Petersen
patent: 5625545 (1997-04-01), Hammond
patent: 5666278 (1997-09-01), Ng et al.
patent: 5805437 (1998-09-01), Gruning
patent: 5852558 (1998-12-01), Julian et al.
Nabae, et al., A New Neutral-Point-Clamped PWM Inverter, IEEE-IAS '80, Conf. Proc., pp. 761-766, May, 1980.
M. Marchesoni, et al., A Non Conventional Power Converter for Plasma Stabilization, IEEE-PESC '88 Conf. Rec., pp. 122-129, Jun. 1988.
C. Hochgraf, et al., Comparison of Multilevel Inverters for Static Var Compensation, IEEE-IAS '94 Conf. Proc., pp. 921-928, Sep. 1994.
J.S. Lai & F.Z. Peng, Multilevel Converters--A New Breed of Power Converters, IEEE-IAS '95 Conf. Rec., pp. 2348-2356, Aug. 1995.
M. Manjrekar & G. Venkataramanan, Advanced Topologies and Modulation Strategies for Multilevel Inverters, IEEE-PESC '96 Conf. Rec., pp. 1013-1018, Sep. 1996.
Damiano, et al., A New Approcah In Multilevel Power Conversion, EPE' 97 Conf. Rec., pp. 4.216-4.221, May 1997.
S. H. Hosseini & R.M. Mathur, A Binary Multi-Level Voltage Source Inverter for Static VAR Generation, IEEE-CCECE '97 Conf. Rec., pp. 427-430, Jun. 1997.
Lipo Thomas A.
Manjrekar Madhav D.
Nguyen Matthew
Wisconsin Alumni Research Foundation
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