Cross current control for power converter systems and integrated magnetic choke assembly
First Claim
1. A cross current control system for multiple, parallel-coupled power converters, the cross current control system comprising:
- common mode chokes, each coupled to a respective power converter;
local cross current detectors, each configured for obtaining common mode cross currents from a respective output line of a respective power converter;
local cross current feedback controllers, each configured for receiving the common mode cross currents from respective local cross current detectors, calculating a resultant cross current, and generating a local feedback control signal; and
local converter controllers, each configured for using a respective local feedback control signal to drive the respective power converter in accordance with a coordinated switching pattern with respect to the other power converters.
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Abstract
A cross current control system for multiple, parallel-coupled power converters includes common mode chokes, local cross current feedback controllers, and local converter controllers. Each common mode choke is coupled to a respective power converter. Each local cross current feedback controller is configured for receiving common mode cross currents from a respective local cross current detector, calculating a resultant cross current, and generating a local feedback control signal. Each local converter controller is configured for using a respective local feedback control signal to drive the respective power converter in accordance with a coordinated switching pattern. An integral choke assembly includes a common mode choke and a differential mode choke with common and differential mode choke cores configured with at least one magnetic flux path being shared by magnetic flux generated by common mode coils and differential mode coils.
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Citations
67 Claims
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1. A cross current control system for multiple, parallel-coupled power converters, the cross current control system comprising:
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common mode chokes, each coupled to a respective power converter;
local cross current detectors, each configured for obtaining common mode cross currents from a respective output line of a respective power converter;
local cross current feedback controllers, each configured for receiving the common mode cross currents from respective local cross current detectors, calculating a resultant cross current, and generating a local feedback control signal; and
local converter controllers, each configured for using a respective local feedback control signal to drive the respective power converter in accordance with a coordinated switching pattern with respect to the other power converters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A cross current control system for multiple, parallel-coupled power converters, the cross current control system comprising:
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common mode chokes, each coupled to a respective power converter and comprising an integrated magnetic AC link choke;
local cross current detectors, each configured for obtaining a common mode cross current from a respective output line of a respective power converter;
local cross current feedback controllers, each configured for receiving the common mode cross currents from respective local cross current detectors, calculating a resultant cross current, and generating a local feedback control signal;
a global feedforward controller, configured for detecting switching patterns of the power converters and generating counter balance zero-sequence global feedforward control signals; and
local converter controllers, each configured for using a respective local feedback control signal and a respective global feedforward control signal to drive the respective power converter in accordance with an interleaved switching pattern with respect to the other power converters. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A cross current control system for multiple, parallel-coupled power converters, the cross current control system comprising:
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common mode chokes, each coupled to a respective power converter local cross current detectors, each configured for obtaining a common mode cross current from a respective output line of a respective power converter;
local cross current feedback controllers, each configured for receiving the common mode cross currents from respective local cross current detectors, calculating a resultant cross current, and generating a local feedback control signal;
a global feedforward controller configured for detecting switching patterns of the power converters and generating counter balance zero-sequence global feedforward control signals;
a global cross current feedback controller configured for receiving the common mode cross currents from the local cross current detectors, calculating a resulting global cross current, and generating global feedback control signals; and
local converter controllers, each is configured for using a respective local feedback control signal, a respective global feedback control signal and a respective global feedforward control signal, to drive the respective power converter in accordance with an interleaved switching pattern with respect to the other power converters. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An integral choke assembly comprising:
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a common mode choke comprising a common mode core wound with at least two common mode coils; and
a differential mode choke comprising a differential mode core wound with at least one differential mode coil, wherein the common and differential mode choke cores are configured so that at least one magnetic flux path is shared by magnetic flux generated by common mode coils and differential mode coils. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
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51. An integral choke assembly comprising:
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a three phase common mode choke comprising a common mode core, wherein the common mode core comprises closed rectangular core wound with three common mode coils, one for each phase; and
a three phase differential mode choke comprising a differential mode core, wherein the differential mode core comprises an E core wound with a respective differential mode coil on each leg, the legs of the E core facing the closed rectangular core and sharing a part of magnetic flux path of the closed rectangular core. - View Dependent Claims (52)
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53. An integral choke assembly comprising:
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a three phase common mode choke comprising a common mode core, wherein the common mode core comprises a top closed rectangular core wound with three common mode top coils and a bottom closed rectangular core wound with three common mode bottom coils; and
a three phase differential mode choke comprising a differential mode core, wherein the differential mode core comprises three posts, with a respective differential mode coil on each post, the three posts arranged between the top and bottom closed rectangular cores and sharing a part of top and bottom rectangular magnetic flux paths. - View Dependent Claims (54)
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55. An integral choke assembly comprising:
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a single phase common mode choke comprising a common mode core, wherein the common mode core comprises a closed rectangular core wound with two common mode coils; and
a single phase differential mode choke comprising a differential mode core, wherein the differential mode core comprises a U core wound with two differential mode coils on each leg, the legs of the U core facing the closed rectangular core and sharing a part of magnetic flux path of the closed rectangular core. - View Dependent Claims (56)
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57. An integral choke assembly comprising:
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a single phase common mode choke comprising a common mode core, wherein the common mode core comprises a top closed rectangular core wound with one common mode top coil and a bottom closed rectangular core wound with one common mode bottom coil; and
a single phase differential mode choke comprising a differential mode core, wherein the differential mode core comprises two posts with a differential mode coil on each post, the two posts arranged between the top and bottom closed rectangular cores and sharing a part of top and bottom rectangular magnetic flux paths. - View Dependent Claims (58)
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59. A method of controlling cross-current through multiple, parallel-coupled power converters, comprising:
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providing common mode chokes, each coupled to a respective power converter;
obtaining common mode cross currents from output lines of the power converters; and
for each respective power converter, calculating a resultant cross current by using the respective common mode cross currents, generating a local feedback control signal by using the resultant cross current, driving the respective power converter by using the respective local feedback control signal in accordance with a coordinated switching pattern with respect to the other power converters. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66)
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67. A method for controlling a power converter comprising:
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providing an integrated magnetic AC link common mode choke coupled to the power converter;
obtaining common mode currents from respective output lines of the power converter;
generating a feedback control signal; and
driving the power converter by using the feedback control signal.
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Specification