Grid regulation services for energy storage devices based on grid frequency
First Claim
1. A method, comprising:
- monitoring a frequency of an electrical power distribution system;
when the frequency of the electrical power distribution system is in a first frequency range, receiving power from the electrical power distribution system and charging an energy storage device at a charging rate with the received power, the charging rate being selected based at least in part on a pre-determined or user-selected completion time for charging the energy storage device; and
when the frequency of the electrical power distribution system is in a second frequency range different from the first frequency range, discharging the energy storage device at a discharging rate and delivering power from the energy storage device to the electrical power distribution system, the discharging rate being selected based on a measured average charging rate for the energy storage device, the discharging rate also being selected to allow charging the energy storage device to a completion charge by the end of the pre-determined or user-selected completion time.
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Accused Products
Abstract
Disclosed herein are representative embodiments of methods, apparatus, and systems for charging and discharging an energy storage device connected to an electrical power distribution system. In one exemplary embodiment, a controller monitors electrical characteristics of an electrical power distribution system and provides an output to a bi-directional charger causing the charger to charge or discharge an energy storage device (e.g., a battery in a plug-in hybrid electric vehicle (PHEV)). The controller can help stabilize the electrical power distribution system by increasing the charging rate when there is excess power in the electrical power distribution system (e.g., when the frequency of an AC power grid exceeds an average value), or by discharging power from the energy storage device to stabilize the grid when there is a shortage of power in the electrical power distribution system (e.g., when the frequency of an AC power grid is below an average value).
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Citations
21 Claims
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1. A method, comprising:
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monitoring a frequency of an electrical power distribution system; when the frequency of the electrical power distribution system is in a first frequency range, receiving power from the electrical power distribution system and charging an energy storage device at a charging rate with the received power, the charging rate being selected based at least in part on a pre-determined or user-selected completion time for charging the energy storage device; and when the frequency of the electrical power distribution system is in a second frequency range different from the first frequency range, discharging the energy storage device at a discharging rate and delivering power from the energy storage device to the electrical power distribution system, the discharging rate being selected based on a measured average charging rate for the energy storage device, the discharging rate also being selected to allow charging the energy storage device to a completion charge by the end of the pre-determined or user-selected completion time. - View Dependent Claims (2, 3, 4)
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5. One or more non-transitory computer-readable storage media storing computer-readable instructions that when executed by a computer cause the computer to perform a method, the method comprising:
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monitoring a frequency of an electrical power distribution system; when the frequency of the electrical power distribution system is in a first frequency range, receiving power from the electrical power distribution system and charging an energy storage device at a charging rate with the received power; and when the frequency of the electrical power distribution system is in a second frequency range different from the first frequency range, discharging the energy storage device at a discharging rate clamped below a discharging rate selected in response to an actual average charging rate for the energy storage device and a completion time for charging the energy storage device and delivering power from the energy storage device to the electrical power distribution system. - View Dependent Claims (6, 7, 8, 9)
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10. A method, comprising:
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charging an energy storage device in response to a frequency of an electrical power distribution system when the frequency is within a first frequency range, the charging occurring responsive to a pre-determined or user-selected completion time for charging the energy storage device at a charging rate selected based at least in part on an actual average charging rate for an energy storage device; discharging the energy storage device in response to a frequency of the electrical power distribution system when the frequency is within a second frequency range, the discharging occurring responsive to the pre-determined or user-selected completion time for charging the energy storage device; and delivering power from the discharging energy storage device to the electrical power distribution system. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. One or more non-transitory computer-readable storage media storing computer-readable instructions that when executed by a computer cause the computer to perform a method, the method comprising:
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charging an energy storage device in response to a frequency of an electrical power distribution system when the frequency is within a first frequency range at a charging rate selected based at least in part on an actual average charging rate for an energy storage device; discharging an energy storage device in response to a frequency of an electrical power distribution system when the frequency is within a second frequency range, the discharging occurring responsive to the pre-determined or user-selected completion time for charging the energy storage device at a discharging rate selected based at least in part on an actual average charging rate for an energy storage device; and delivering power from the discharging energy storage device to the electrical power distribution system. - View Dependent Claims (18, 19, 20, 21)
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Specification