Regenerative multicell drive system with overlap angle in fundamental frequency modulation
AssigneeInnomotics GmbH
InventorsLiviu Mihalache, Richard H. Osman, Mukul Rastogi
Life of this patent
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Abstract
A regenerative drive system includes a plurality of power cells receiving power from a source and supplying power to one or more output phases, wherein each power cell is operable in multiple operation modes, each power cell including multiple switching devices including active front-end switching devices, and a central control system controlling operation of the plurality of power cells, wherein the central control system is configured to control the active front-end switching devices of each power cell with variable conduction angles in the multiple operation modes.
Claims13
A three-phase regenerative drive system comprising:
- a plurality of power cells receiving power from a source and supplying power to one or more output phases, wherein each power cell is operable in a first operation mode comprising a motoring mode supplying power to output phases of a load and a second operation mode comprising a regeneration mode absorbing power from the load, the method, each power cell comprising multiple switching devices including active transistor-based front-end switching devices, and
- a central control system controlling configured to control the transistor-based active front-end switching devices of each power cell with fixed nominal conduction angles in the first operating mode,
- advance the conduction angles for the transistors in the second operation mode by greater than 0 (zero) degrees in addition to the nominal conduction angles based on output current and impedance of respective ones of the power cells, and
- control the active front-end switching devices of the plurality of power cells with the advanced conduction angles during the second operation mode, thereby forcing simultaneous conduction of two transistors in an upper side or of two transistors in a lower side of the regenerative drive system.
A method for controlling a three-phase regenerative drive system operable in a first operation mode comprising a motoring mode supplying power to a load and a second operation mode comprising a regeneration mode absorbing power from the load, the method comprising:
- setting fixed nominal conduction angles for transistors of active front-end switching devices of a plurality of power cells of the drive system in the first operation mode,
- advancing the conduction angles for the transistors in the second operation mode by greater than 0 (zero) degrees in addition to the nominal conduction angles based on output current and impedance of respective ones of the power cells, and
- controlling the active front-end switching devices of the plurality of power cells with the advanced conduction angles during the second operation mode, thereby forcing simultaneous conduction of two transistors in an upper side or of two transistors in a lower side of the regenerative drive system.
Dependencies are inferred from the claim text.