Power conversion system and method
First Claim
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1. A power conversion system, comprising:
- a multiphase autotransformer, comprising;
an input operative to receive multiphase AC electrical currents from an isolation transformer or a multiphase AC power source, andan integer number N multiphase outputs, wherein N is greater than 1, each individual output including a set of an integer number M output terminals, wherein M is greater than 2, each individual output being operative to provide multiphase AC output currents at the output terminals, with the AC output currents of each multiphase output being at a non-zero phase angle relative to all other multiphase outputs; and
a plurality of power converters, each individual power converter including;
a DC output, and a multiphase rectifier operatively coupled with one of the multiphase outputs to convert the corresponding AC output currents to provide DC electrical power at the corresponding DC output to power a DC link having a choke, an inductance or a capacitance coupled between the multiphase rectifier and the DC output, the DC outputs of the plurality of power converters being separate from one another.
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Abstract
Power conversion systems and methods are provided for driving a plurality of motor loads, in which an autotransformer receives AC input currents and provides a plurality of multiphase outputs at a non-zero phase angle relative to one another, and the individual multiphase outputs are provided to corresponding motor drives with rectifiers to convert the multiphase outputs to DC electrical power, and inverters to convert the DC power to AC to drive corresponding motor loads.
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Citations
25 Claims
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1. A power conversion system, comprising:
a multiphase autotransformer, comprising; an input operative to receive multiphase AC electrical currents from an isolation transformer or a multiphase AC power source, and an integer number N multiphase outputs, wherein N is greater than 1, each individual output including a set of an integer number M output terminals, wherein M is greater than 2, each individual output being operative to provide multiphase AC output currents at the output terminals, with the AC output currents of each multiphase output being at a non-zero phase angle relative to all other multiphase outputs; and
a plurality of power converters, each individual power converter including;
a DC output, and a multiphase rectifier operatively coupled with one of the multiphase outputs to convert the corresponding AC output currents to provide DC electrical power at the corresponding DC output to power a DC link having a choke, an inductance or a capacitance coupled between the multiphase rectifier and the DC output, the DC outputs of the plurality of power converters being separate from one another.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for driving multiple AC motors, the method comprising:
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using a multiphase autotransformer having an integer number N multiphase outputs (N>
1) with each multiphase output including a set of an integer number M output terminals (M>
2), transforming multiphase AC electrical currents from an isolation transformer or a multiphase AC power source to create N sets of multiphase AC output currents, each set of multiphase AC output currents being at a non-zero phase angle relative to all other sets;rectifying each individual set of multiphase AC output currents to create a corresponding DC bus to power a DC link for the DC bus having a choke, an inductance or a capacitance coupled between a multiphase rectifier and the DC output; and inverting each individual DC bus to provide AC output power to a corresponding one of a plurality of AC motor loads. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A power conversion system, comprising:
a multiphase autotransformer comprising; an input operative to receive multiphase AC electrical currents from an isolation transformer or a multiphase AC power source, and an integer number N multiphase outputs, wherein And is greater than 1, each individual output including a set of an integer number M output terminals, wherein M is greater than 2, each individual output being operative to provide multiphase AC output currents at the output terminals, with the AC output currents of each multiphase output being at a non-zero phase angle relative to all other multiphase outputs; and
a plurality of power converters, each individual power converter including;a DC output, and a multiphase rectifier operatively coupled with one of the multiphase outputs to convert the corresponding AC output currents to provide DC electrical power at the corresponding DC output to power a DC link having a choke, an inductance or a capacitance coupled between the multiphase rectifier and the DC output, the DC outputs of the plurality of power converters being separate from one another;
wherein at least one of the power converters includes an inverter operatively coupled to receive DC power from the corresponding DC output and to provide AC output power to an AC motor load.
Specification