High power motor drive converter system and modulation control
AssigneeGeneral Electric Company
InventorsJames Patrick Lyons, Vlatko Vlatkovic, Paul Martin Espelage, Albert Andreas Maria Esser
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Abstract
A high power motor drive converter includes a three level neutral point clamped (NPC) output power conversion stage including switches; a split series connected DC capacitor bank coupled in parallel with the NPC output power conversion stage; and a controller for selecting switch positions for controlling the NPC output power conversion stage and controlling a neutral voltage balance of the DC capacitor bank by using space vector modulation and predictive charge calculations.
Claims23
A high power motor drive converter comprising:
- a three level neutral point clamped (NPC) output power conversion stage including switches for supplying power to an AC drive motor;
- a split series connected DC capacitor bank coupled in parallel with the NPC output power conversion stage;
- a controller for selecting switch positions for controlling the NPC output power conversion stage and controlling a neutral voltage balance of the DC capacitor bank by using space vector modulation and predictive charge calculations;
- an input power conversion stage coupled in parallel to the capacitor bank.
A method of controlling a high power motor drive converter including a three level neutral point clamped (NPC) output power conversion stage including switches for supplying power to an AC drive motor, a split series connected DC capacitor bank coupled in parallel with the NPC output power conversion stage, the method comprising:
- selecting switch positions for controlling the NPC output power conversion stage and controlling a neutral voltage balance of the DC capacitor bank by using space vector modulation to control a magnitude and a rotation of a reference voltage vector in a complex voltage plane defined by orthogonal axes and phase voltages.
Dependencies are inferred from the claim text.