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US 8,044,631 B2Granted
Power conversion systems and methods for controlling harmonic distortion
AssigneeRockwell Automation Technologies, Inc.
InventorsJingya Dai, Yongqiang Lang, Bin Wu, Dewei Xu, Navid R. Zargari
Life of this patent
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Abstract
Control systems, methods and power conversion systems are presented for controlling harmonic distortion, in which multi-sampling space vector modulation (SVM) is employed for controlling power converter switching devices, with a reference vector being sampled two or more times during each SVM period to update the SVM dwell times more than once during each SVM cycle.
Claims19
A power conversion system, comprising:
- at least one multi-phase AC connection having two or more AC terminals for receiving or supplying multi-phase electrical power;
- a DC circuit for receiving or supplying DC electrical power, the DC circuit comprising first and second DC current paths and at least one storage component;
- a switching network comprising a plurality of switching devices individually coupled between one of the DC current paths and one of the AC terminals, the switching devices individually operable to selectively electrically couple the corresponding DC current path with the corresponding AC terminal according to a corresponding switching control signal;
- and
- a switch control system providing the switching control signals by space vector modulation according to a plurality of dwell time values derived from a modulation index and an angle associated with a current reference vector representing a desired converted AC in a current space vector diagram sector to selectively provide three switching states in the switching network corresponding to three diagram vectors defining the current diagram sector in each of a continuous series of space vector modulation periods to convert power from DC to AC or AC to DC using the switching network, the switch control system comprising a multi-sampling SVM component operative to sample the current reference vector and derive the dwell time values a plurality of times during each modulation period.
2 more elements
A method for space vector modulation switching control of a switching power converter, the method comprising:
- providing switching control signals by space vector modulation to a plurality of switching devices of a switching network according to a plurality of dwell time values in each of a continuous series of space vector modulation periods to convert power from DC to AC or AC to DC using the switching network;
- sampling a current reference vector a plurality of times during each modulation period;
- and
- for each sampling of the current reference vector, deriving the dwell time values according to a modulation index and an angle associated with the current reference vector representing a desired converted AC in a current space vector diagram sector to selectively provide three switching states in the switching network corresponding to three diagram vectors defining the current diagram sector.
1 more element
A control system for operating a plurality of switching devices to convert electrical power, the control system comprising:
- a space vector modulation component that provides a plurality of switching control signals by space vector modulation according to a plurality of dwell time values in each of a continuous series of space vector modulation periods;
- the space vector modulation component operative to sample a current reference vector a plurality of times during each modulation period, and for each sampling of the current reference vector, to derive the dwell time values according to a modulation index and an angle associated with the current reference vector representing a desired converted AC in a current space vector diagram sector to selectively provide three switching states corresponding to three diagram vectors defining the current diagram sector.
A computer readable media comprising computer-executable instructions for:
- providing switching control signals by space vector modulation to a plurality of switching devices of a switching network according to a plurality of dwell time values in each of a continuous series of space vector modulation periods to convert power from DC to AC or AC to DC using the switching network;
- sampling a current reference vector a plurality of times during each modulation period;
- and
- for each sampling of the current reference vector, deriving the dwell time values according to a modulation index and an angle associated with the current reference vector representing a desired converted AC in a current space vector diagram sector to selectively provide three switching states in the switching network corresponding to three diagram vectors defining the current diagram sector.
1 more element
Dependencies are inferred from the claim text.