Control of small distributed energy resources
First Claim
1. A method of controlling distributed energy resources, the method comprising:
- operating a microsource in a grid mode in which the microsource is connected to a utility grid, wherein the microsource is located in a microgrid and is configured to deliver a power P1 at a frequency ω
1, wherein during operation in the grid mode the frequency ω
1 is approximately equal to a first frequency and the power P1 is approximately equal to a first power, and wherein the first frequency is an operating frequency of the utility grid; and
transferring the microsource from the grid mode to an island mode such that the microsource is disconnected from the utility grid, wherein the transferring causes a frequency change such that the frequency ω
1 changes to a second frequency and a power change such that the power P1 changes to a second power;
wherein the microsource has a slope switch frequency, wherein the frequency change occurs at a first rate with respect to the power change while the frequency ω
1 is less than the slope switch frequency, and wherein the frequency change occurs at a second rate with respect to the power change while the frequency ω
1 is greater than the slope switch frequency.
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Accused Products
Abstract
A method includes operating a microsource in a grid mode in which the microsource is connected to a utility grid. The microsource is located in a microgrid and is configured to deliver a power P1 at a frequency ω1. During operation in the grid mode ω1 is a first frequency and P1 is a first power. The first frequency is an operating frequency of the utility grid. The microsource is transferred from the grid mode to an island mode, causing a frequency change such that ω1 changes to a second frequency and a power change such that P1 changes to a second power. The frequency change occurs at a first rate with respect to the power change while ω1 is less than a slope switch frequency. The frequency change occurs at a second rate with respect to the power change while ω1 is greater than the slope switch frequency.
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Citations
20 Claims
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1. A method of controlling distributed energy resources, the method comprising:
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operating a microsource in a grid mode in which the microsource is connected to a utility grid, wherein the microsource is located in a microgrid and is configured to deliver a power P1 at a frequency ω
1, wherein during operation in the grid mode the frequency ω
1 is approximately equal to a first frequency and the power P1 is approximately equal to a first power, and wherein the first frequency is an operating frequency of the utility grid; andtransferring the microsource from the grid mode to an island mode such that the microsource is disconnected from the utility grid, wherein the transferring causes a frequency change such that the frequency ω
1 changes to a second frequency and a power change such that the power P1 changes to a second power;wherein the microsource has a slope switch frequency, wherein the frequency change occurs at a first rate with respect to the power change while the frequency ω
1 is less than the slope switch frequency, and wherein the frequency change occurs at a second rate with respect to the power change while the frequency ω
1 is greater than the slope switch frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A microgrid comprising:
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a microsource including a power controller configured to control a frequency ω
1 and a power P1 of the microsource;operate the microsource in a grid mode in which the microsource is connected to a utility grid, and wherein the frequency ω
1 is approximately equal to a first frequency and the power P1 is approximately equal to a first power, wherein the first frequency is an operating frequency of the utility grid; andtransfer the microsource from the grid mode to an island mode such that the microsource is disconnected from the utility grid, wherein the transfer causes a frequency change such that the frequency ω
1 changes to a second frequency and a power change such that the power P1 changes to a second power;wherein the microsource has a slope switch frequency, wherein the frequency change occurs at a first rate with respect to the power change while the frequency ω
1 is less than the slope switch frequency, and wherein the frequency change occurs at a second rate with respect to the power change while the frequency ω
1 is greater than the slope switch frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification