Method and apparatus for controlling a stand-alone 4-leg...

Details Method and apparatus for controlling a stand-alone 4-leg... Method and apparatus for controlling a stand-alone 4-leg...

2005-08-02

2005-08-02

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S056020, C363S098000, C323S908000

Reexamination Certificate

active

06924993

ABSTRACT:
Methods and apparatus are provided for controlling a stand-alone four-leg three-phase inverter. The inverter three-phase output is converted from AC domain elements to corresponding DC domain elements. The DC domain elements are processed into combined regulating and imbalance compensating signals, including over-current limiting. The compensating signals are restored to corresponding AC domain signals, and are processed into control inputs for the inverter, in order to stabilize the inverter output when connected to an unbalanced load. The inverter controller can be implemented entirely in software as a control algorithm.

REFERENCES:
patent: 5654882 (1997-08-01), Kanazawa et al.
patent: 6052297 (2000-04-01), Akamatsu et al.
patent: 2004/0196679 (2004-10-01), Apeland et al.
R.A. Gannett, Application of Synchronous and Stationary Frame Controllers for Unbalanced and Non-Linear Load Compensation in 4-Leg Inverters, May 2002.
Michael J. Ryan, Decoupled Control of a Four-Leg Inverter via a New 4x4 Transmission Matrix, IEEE Transactions on Power Electronics, vol. 16, No. 5, Sep. 2001.
Krause et al., Analysis of Electric Machinery, no date.
Richard Zhang, A Three-Phase Inverter with A Neutral Leg with Space Vector Modulation, Feb. 1997, pp. 857-863.

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