Unified power flow controller utilizing energy saving devices at a point of power consumption
First Claim
1. A unified power flow controller provided at a point of power consumption for regulating voltage received from an electric utility grid, the unified power flow controller comprising:
- a terminal electrically coupled to a power source that originates from the electric utility grid, the terminal receiving a grid alternating current and a grid alternating voltage;
a power converter electrically coupled to the terminal, the power converter comprising;
an active rectifier that converts substantially all of the grid alternating current to a direct current; and
an inverter that converts the direct current to a load alternating current and a load alternating voltage, the load alternating voltage being less than the grid alternating voltage, the load alternating current including at least one of a load real power component and a load reactive power component;
a transformer having first terminals electrically coupled to the power source and second terminals electrically coupled to an output of the inverter, the transformer being adapted to inject the load alternating voltage in series with the grid alternating voltage; and
a switch provided across the first terminals of the transformer to bypass the transformer and provide the grid power source directly to the point of power consumption.
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Abstract
A system and method are provided for regulating voltage received from an electric utility grid. A unified power flow controller is provided at a point of power consumption and includes a terminal electrically coupled to a power source, which receives a grid alternating current and a grid alternating voltage from the electric utility grid. A power converter is electrically coupled to the terminal and includes an active rectifier that converts substantially all of the grid alternating current to a direct current and an inverter that converts the direct current to a load alternating current and a load alternating voltage, the load alternating voltage being less than the grid alternating voltage. A transformer is provided having first terminals electrically coupled to the power source and second terminals electrically coupled to an output of the inverter. The transformer injects the load alternating voltage in series with the grid alternating voltage.
12 Citations
19 Claims
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1. A unified power flow controller provided at a point of power consumption for regulating voltage received from an electric utility grid, the unified power flow controller comprising:
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a terminal electrically coupled to a power source that originates from the electric utility grid, the terminal receiving a grid alternating current and a grid alternating voltage; a power converter electrically coupled to the terminal, the power converter comprising; an active rectifier that converts substantially all of the grid alternating current to a direct current; and an inverter that converts the direct current to a load alternating current and a load alternating voltage, the load alternating voltage being less than the grid alternating voltage, the load alternating current including at least one of a load real power component and a load reactive power component; a transformer having first terminals electrically coupled to the power source and second terminals electrically coupled to an output of the inverter, the transformer being adapted to inject the load alternating voltage in series with the grid alternating voltage; and a switch provided across the first terminals of the transformer to bypass the transformer and provide the grid power source directly to the point of power consumption. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of regulating voltage at a point of power consumption, the voltage being received from an electric utility grid, the method comprising:
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receiving a grid alternating current and a grid alternating voltage originating from the electric utility grid; converting substantially all of the grid alternating current to a direct current; converting the direct current to a load alternating current and a load alternating voltage, the load alternating voltage being less than the grid alternating voltage; injecting the load alternating voltage in series with the grid alternating voltage in a first configuration; and providing the grid power source directly to the point of power consumption in a second configuration. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A non-transitory computer-readable storage medium having stored therein instructions which, when executed by a microprocessor, causes a unified power flow controller provided at a point of power consumption to:
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receive a grid alternating current and a grid alternating voltage originating from the electric utility grid; convert substantially all of the grid alternating current to a direct current; convert the direct current to a load alternating current and a load alternating voltage, the load alternating voltage being less than the grid alternating voltage; inject the load alternating voltage in series with the grid alternating voltage in a first configuration; and provide the grid power source directly to the point of power consumption in a second configuration. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification