SYSTEMS AND METHODS FOR UNINTERRUPTIBLE POWER SUPPLIES WITH GENERATORS
First Claim
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1. A electrical power system, comprising:
- a multiport power converter, comprising a plurality of electrical ports, each having at least two lines, and an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each line of each said port is connected to multiple ends of said energy transfer reactance through multiple respective bidirectional switches;
a battery bank connected to a first one of said ports;
an AC power source connected to a second one of said ports;
a third one of said ports being connected to supply power to an AC power grid or microgrid;
wherein said AC power source does not operate synchronously with the AC power grid or microgrid;
wherein said converter draws power from said first, second, and/or third ports, and drives power into said first and/or third ports,while changing the frequency and/or phase of power received at said second port to thereby provide power synchronously to said third port when needed.
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Abstract
Systems and methods where a power-packet-switching converter is used to interface a synchronous AC connection (e.g. to the utility power grid, or to a microgrid) to a DC source (e.g. a battery bank, or possibly a photovoltaic cell bank) and to a non-synchronous AC power source (e.g. a wind turbine or a motor-generator). The power-packet-switching converter not only provides voltage conversion and other functions (e.g. DC to AC, AC-AC with frequency change, 2-phase to 3-phase, power factor correction etc.), but also provides phase correction to convert asynchronous AC to synchronous AC.
23 Citations
21 Claims
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1. A electrical power system, comprising:
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a multiport power converter, comprising a plurality of electrical ports, each having at least two lines, and an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each line of each said port is connected to multiple ends of said energy transfer reactance through multiple respective bidirectional switches; a battery bank connected to a first one of said ports; an AC power source connected to a second one of said ports; a third one of said ports being connected to supply power to an AC power grid or microgrid;
wherein said AC power source does not operate synchronously with the AC power grid or microgrid;wherein said converter draws power from said first, second, and/or third ports, and drives power into said first and/or third ports, while changing the frequency and/or phase of power received at said second port to thereby provide power synchronously to said third port when needed. - View Dependent Claims (2, 3, 4)
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5. A system for providing an uninterruptible power supply, comprising:
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a bidirectional multiport power converter, comprising; a plurality of input/output portals, each comprising one or more ports; an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each said port of each said input/output portal is connected in parallel to each end of the energy transfer reactance by a pair of bidirectional switching devices; wherein, at various times, the energy transfer reactance can be connected to two said ports, to transfer energy therebetween; and wherein, at various times, said energy transfer reactance can be disconnected from said input/output portals; an asynchronous AC power source connected to a first input/output portal of the bidirectional multiport power converter supplying converted synchronous AC power to an AC grid, said AC grid connected to a second input/output portal of said bidirectional multiport power converter; at least one DC power source connected to a third input/output portal of said bidirectional multiport power converter supplying converted synchronous AC power to said AC grid and said bidirectional multiport power converter operated to supply power from the at least one DC power source when consumption from said AC grid exceeds production from said first input/output portal to level with peak voltage demand thus optimizing power generation from said first input/output portal; and wherein said AC power source comprises a combustion engine-driven generator operated to supply converted synchronous AC power to said AC grid. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for providing an uninterruptible power supply, comprising:
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using a bidirectional multiport power converter, comprised of; a plurality of input/output portals, each comprising one or more ports; an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each of the ports of each of the input/output portals is connected in parallel to each end of the energy transfer reactance by a pair of bidirectional switching devices; wherein, at various times, the energy transfer reactance can be connected to two of the ports, to transfer energy there between; and wherein, at various times, the energy transfer reactance can be disconnected from the input/output portals; connecting an asynchronous AC power source to a first input/output portal of the bidirectional multiport power converter supplying converted synchronous AC power to an AC grid, the AC grid connected to a second input/output portal of the bidirectional multiport power converter; connecting at least one DC power source to a third input/output portal of the bidirectional multiport power converter supplying converted synchronous AC power to the AC grid; controlling the bidirectional multiport power converter to transfer power from the at least one DC power source when consumption from the AC grid exceeds production from first input/output portal to level with peak voltage demand thus optimizing power generation from first input/output portal; and wherein the AC power source comprises a combustion engine-driven generator operated to supply converted synchronous AC power to the AC grid. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21-38. -38. (canceled)
Specification