CURRENT BALANCE CONTROL FOR NON-INTERLEAVED PARALLEL BRIDGE CIRCUITS IN POWER CONVERTER
First Claim
1. A power converter system, comprising:
- a power converter, said power converter comprising a plurality of bridge circuits coupled in parallel, each bridge circuit comprising at least one switching element;
a control system configured to provide control commands to the switching elements of the plurality of bridge circuits to control pulse width modulation of the switching elements according to a substantially non-interleaved switching pattern, the control system further configured to adjust timing of the control commands to reduce current imbalance between the plurality of bridge circuits coupled in parallel.
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Accused Products
Abstract
Systems and methods for reducing current imbalance between parallel bridge circuits used in a power converter of a power generation system, such as a wind driven doubly fed induction generator (DFIG) system, are provided. The power converter can include a plurality of bridge circuits coupled in parallel to increase the output power capability of the system. Each of the bridge circuits can include a pair of switching elements, such as insulated gate bipolar transistors (IGBTs), coupled in series with one another. The switching elements of the parallel bridge circuits can be controlled, for instance, using control commands (e.g. pulse width modulation commands) according to a substantially non-interleaved switching pattern. The timing of the control commands according to the substantially non-interleaved switching pattern can be adjusted to reduce current imbalance between the parallel bridge circuits.
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Citations
20 Claims
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1. A power converter system, comprising:
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a power converter, said power converter comprising a plurality of bridge circuits coupled in parallel, each bridge circuit comprising at least one switching element; a control system configured to provide control commands to the switching elements of the plurality of bridge circuits to control pulse width modulation of the switching elements according to a substantially non-interleaved switching pattern, the control system further configured to adjust timing of the control commands to reduce current imbalance between the plurality of bridge circuits coupled in parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of providing an output power to a load, comprising:
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receiving, at a power converter, an alternating current power generated at a generator; converting, with the power converter, the alternating current power to an output power, the power converter comprising a plurality of bridge circuits coupled in parallel, each bridge circuit comprising a pair of switching elements coupled in series with one another; receiving control commands to control pulse width modulation of the switching elements according to a substantially non-interleaved switching pattern; and adjusting the timing of the control commands to reduce current imbalance between the plurality of bridge circuits coupled in parallel. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A doubly fed induction generator system, comprising:
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a doubly fed induction generator configured to generate alternating current power; a rotor side converter configured to receive the alternating current power and convert the alternating current power to a DC output; a line side converter coupled to said rotor side converter via a DC link, the line side converter configured to receive the DC output from the rotor side converter and convert the DC power to an output power, at least one of the rotor side converter or the line side converter comprising a plurality of bridge circuits coupled in parallel, each bridge circuit comprising a pair of switching elements coupled in series with one another a controller, said controller configured to provide control commands to control pulse width modulation of the switching elements of the plurality of bridge circuits according to a substantially non-interleaved switching pattern, the controller further configured to adjust the timing of the control commands to reduce current imbalance between the plurality of bridge circuits coupled in parallel. - View Dependent Claims (18, 19, 20)
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Specification