Balancing current within a parallel modular converter system
First Claim
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1. A current balancing system comprising:
- a plurality of power inverters arranged in parallel, each power inverter included within a respective current loop and configured to generate a corresponding current amount; and
a system controller comprising;
a global controller stage configured to;
generate current commands to evenly distribute, among the plurality of power inverters, a total system current amount to be provided; and
determine, based on a comparison of current amounts generated by the plurality of power inverters responsive to the current commands, a circulation current existing between at least two of the plurality of power inverters; and
a plurality of inverter controllers, wherein each inverter controller independently controls a respective power inverter of the plurality of power inverters, wherein each inverter controller is configured to;
receive a reference frame-transformed amount of the current amount generated by the respective power inverter; and
adjust the current amount generated by the respective power inverter using at least (1) the reference frame-transformed amount and (2) the circulation current,wherein adjusting the current amount operates to mitigate the circulation current.
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Abstract
A current balancing system, and associated method and computer-readable medium are disclosed herein. The current balancing system comprises a plurality of power inverters, each power inverter included within a respective current loop and configured to generate a corresponding current amount. The current balancing system further comprises a plurality of inverter controllers, each inverter controller associated with a respective one of the plurality of power inverters and configured to receive a reference frame-transformed amount of the corresponding current amount. Each inverter controller is capable of independently controlling the corresponding current amount provided to a load.
18 Citations
20 Claims
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1. A current balancing system comprising:
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a plurality of power inverters arranged in parallel, each power inverter included within a respective current loop and configured to generate a corresponding current amount; and a system controller comprising; a global controller stage configured to; generate current commands to evenly distribute, among the plurality of power inverters, a total system current amount to be provided; and determine, based on a comparison of current amounts generated by the plurality of power inverters responsive to the current commands, a circulation current existing between at least two of the plurality of power inverters; and a plurality of inverter controllers, wherein each inverter controller independently controls a respective power inverter of the plurality of power inverters, wherein each inverter controller is configured to; receive a reference frame-transformed amount of the current amount generated by the respective power inverter; and adjust the current amount generated by the respective power inverter using at least (1) the reference frame-transformed amount and (2) the circulation current, wherein adjusting the current amount operates to mitigate the circulation current. - View Dependent Claims (2, 3, 4, 5, 6, 19, 20)
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7. A method of controlling current production of a plurality of power inverters arranged in parallel, wherein each power inverter is independently controlled by a respective inverter controller of a plurality of inverter controllers, the method comprising:
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generating, at a global controller stage, current commands to evenly distribute, among the plurality of power inverters, a total system current amount to be provided; determining a plurality of current amounts generated by the plurality of power inverters responsive to the current commands; determining, based on a comparison of the plurality of current amounts, a circulation current existing between at least two of the plurality of power inverters; transforming a reference frame of each of the plurality of current amounts to produce a plurality of transformed current amounts; and adjusting, using the plurality of inverter controllers, one or more of the current amounts generated by the respective power inverters using at least (1) the plurality of transformed current amounts and (2) the circulation current, wherein adjusting the one or more of the current amounts operates to mitigate the circulation current. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory computer-readable medium comprising computer program code that, when executed by operation of one or more computer processors, performs an operation of controlling current production of a plurality of power inverters arranged in parallel, wherein each power inverter is independently controlled by a respective inverter controller of a plurality of inverter controllers, the operation comprising:
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generating current commands to evenly distribute, among the plurality of power inverters, a total system current amount to be provided; determining a plurality of current amounts generated by the plurality of power inverters responsive to the current commands; determining, based on a comparison of the plurality of current amounts, a circulation current existing between at least two of the plurality of power inverters; transforming a reference frame of each of the plurality of current amounts to produce a plurality of transformed current amounts; and adjusting, using the plurality of inverter controllers, one or more of the current amounts generated by the respective power inverters using at least (1) the plurality of transformed current amounts and (2) the circulation current, wherein adjusting the one or more of the current amounts operates to mitigate the circulation current. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification