Partial regeneration in a multi-level power inverter
First Claim
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1. A medium voltage drive system comprising:
- a plurality of power cells each to couple between a transformer and a load, wherein a first subset of the power cells each including an active front end are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform the partial regeneration; and
a controller coupled to the plurality of power cells to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system, the controller including a digitizer to digitize voltage signals and current signals from an input to the transformer, input current signals to the active front end, and the DC bus voltage and provide the digitized information to a reference signal generator, the reference signal generator to generate reference signals to provide to a modulator, the modulator to provide gate signals to the active front end of each of the first subset of the power cells based on the reference signals.
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Abstract
In one embodiment, the present invention includes a medium voltage drive system having multiple power cells each to couple between a transformer and a load. A first subset of the power cells are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform partial regeneration. A controller may be included in the system to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system.
87 Citations
17 Claims
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1. A medium voltage drive system comprising:
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a plurality of power cells each to couple between a transformer and a load, wherein a first subset of the power cells each including an active front end are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform the partial regeneration; and a controller coupled to the plurality of power cells to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system, the controller including a digitizer to digitize voltage signals and current signals from an input to the transformer, input current signals to the active front end, and the DC bus voltage and provide the digitized information to a reference signal generator, the reference signal generator to generate reference signals to provide to a modulator, the modulator to provide gate signals to the active front end of each of the first subset of the power cells based on the reference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving information regarding an input current and input voltage to a transformer of a partial regenerative drive system, regarding an input current to an active front end of a regenerative cell of the partial regenerative drive system, and regarding a bus voltage of the regenerative cell; independently generating a harmonic current reference, an active power current reference, and a reactive power current reference from the information; combining a first portion of the harmonic current reference with the active power current reference and combining a second portion of the harmonic current reference with the reactive power current reference; and generating control signals for the active front end using the combined current references. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A system comprising:
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a plurality of modular transformers, wherein at least one first modular transformer includes a non-phase-shifted primary winding coupled to an input power source and non-phase-shifted secondary windings each coupled to a regeneration power cell, and at least one second modular transformer including a phase-shifted primary winding coupled to the input power source and a plurality of phase-shifted secondary windings each coupled to a non-regeneration power cell; a first phase output line having at least a regeneration power cell and a non-regeneration power cell; a second phase output line having at least a regeneration power cell and a non-regeneration power cell; a third phase output line having at least a regeneration power cell and a non-regeneration power cell; and a controller to simultaneously control a bus voltage of a regeneration power cell, correct a power factor of the system, and provide harmonic current compensation for the system, wherein the controller includes a harmonic compensator to generate a harmonic current reference, a voltage controller to generate an active power current reference, and a power factor corrector to generate a reactive power current reference. - View Dependent Claims (15, 16, 17)
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Specification