Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1991-01-08
1991-10-22
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, H02M 75387
Patent
active
050601296
ABSTRACT:
A method of controlling a three-phase, three-level inverter comprises the steps of: jugding whether the current of the output terminal of an inverter of the phase such that the electrical potential of the output terminal equals to the neutral-point terminal of the capacitor among three-output terminals of the inverter is in a positive direction in which current flows into a load connected to this output terminal or in a negative direction in which current flows from the load when another on/off mode having the same instantaneous space voltage vector as the instantaneous space voltage vector in a tentatively selected on/off mode exists; actually selecting the tentatively selected on/off mode if the result of the judgment is positive and actually selecting another on/off mode instead of the tenatively selected on/off mode when the result of the judgement is negative in the case where the electrical potential of the neutral-point terminal of the capacitor is above a preset upper-limit value; and actually selecting the tentatively selected on/off mode if the result of the judgment is negative and actually selecting another on/off mode instead of the tentatively selected on/off mode when the result of the judgment is positive in the case where the electrical potential of the neutral-point terminal of the capacitor is below a preset lower-limit value.
REFERENCES:
patent: 4347558 (1982-08-01), Kalinsky
patent: 4635177 (1987-01-01), Shekhawat et al.
patent: 4953069 (1990-08-01), Braun et al.
Nabie et al., "A New Neutral-Point-Clamped PWM Inverter", IAS Annual Mtg 1980, Cincinnati, Ohio, U.S.A., pp. 761-766, (Sep. 28 to Oct. 3, 1980).
Beha Jr. William H.
Mitsubishi Denki & Kabushiki Kaisha
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