[특허]Plural heat pump and thermal storage system for facilitating power shaping services on the electrical power grid at consumer premises

Portland General Electric Company

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Plural heat pump and thermal storage system for facilitating power shaping services on the electrical power grid at consumer premises

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F25D-017/02 F25D-031/00
출원번호	US-0633793 (2012-10-02)
등록번호	US-9677809 (2017-06-13)
발명자 / 주소	Eustis, Conrad
출원인 / 주소	Portland General Electric Company
대리인 / 주소	Klarquist Sparkman, LLP
인용정보	피인용 횟수 : 2 인용 특허 : 16

초록
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A system and method for storing energy from an electrical grid utilizes a system heat pump at a premises for transferring energy from the grid to a thermal storage reservoir and a premises heat pump that can use the stored energy to provide, for example, heat to the premises. The system heat pump and premises heat pump desirably operate independently of one another so that energy can be transferred to the thermal storage reservoir regardless of whether energy is being withdrawn by the premises heat pump. Plural energy storage systems utilizing respective system and premises heat pumps and thermal storage reservoirs can form a part of the utility customer system with the system heat pumps being operable to shape the load on the electrical grid. A system heat pump can be operated to minimize a customer's bill, or the utility's cost and alternatively to achieve other purposes, depending upon the mode of operation of the system.

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1. A system for storing energy from an electrical grid comprising: a thermal storage reservoir at a premise location for containing liquid that can be heated or cooled to respectively add energy to or remove energy from the thermal storage reservoir;a system heat pump at the premise location coupled to the electrical grid to receive electrical energy from the grid to power the system heat pump, the system heat pump being operable to convert electrical energy from the grid to thermal energy, the system heat pump being coupled to the thermal storage reservoir and operable to deliver thermal energy to the thermal storage reservoir to heat the liquid in the thermal storage reservoir;a premises heat pump at the premise location coupled to the electrical grid to receive electrical energy from the electrical grid to power the premise location heat pump, the premises heat pump being coupled to the thermal storage reservoir and operable to remove thermal energy from the premise location for delivery to the thermal storage reservoir to provide cooling for the premises and operable to remove thermal energy from the thermal storage reservoir to provide heating for the premise location; anda first controller coupled to the system heat pump and operable to control the system heat pump in a heating cycle so as to deliver thermal energy to the thermal storage reservoir regardless of whether energy is being extracted from the thermal storage reservoir by the premises heat pump, wherein the premises heat pump is operable to remove thermal energy from or deliver thermal energy to the thermal storage reservoir independently of whether the system heat pump is delivering thermal energy to or removing thermal energy from the thermal storage reservoir;wherein the first controller has an input for receiving control instructions to control the system heat pump to be operable in response to control instructions in a plurality of modes, the first controller input receiving control instructions from a remote location that is different than the premise location, wherein in response to control instructions from the remote location, the first controller controls the operation of the system heat pump at the premise location to deliver thermal energy to the thermal storage reservoir at the premise location to thereby sink a quantity of energy from the electrical grid into the thermal storage reservoir at the premise location. 2. The system according to claim 1 wherein the system heat pump is operable to both deliver thermal energy to and remove thermal energy from the thermal storage reservoir in response to the control instructions from the remote location and wherein at least one premises heat pump at the premise location is operable to both deliver thermal energy to and remove thermal energy from the premises at the premise location. 3. The system according to claim 1 comprising a first electricity meter for measuring electrical energy delivered from the electrical grid to the premise location, wherein different rates are billed for electric energy delivered from the electrical grid to the premises heat pump, one of such rates being a highest billed rate, wherein at least some heat is removed from the thermal storage reservoir by the premises heat pump for delivery as heat to the premise location at times when the billed rate for power used at the premise location is at the highest billed rate. 4. The system according to claim 1 wherein the thermal storage reservoir comprises plural tanks with liquid flow paths there between and wherein the flow of liquid between the tanks is controlled to control the temperature of the liquid in the respective tanks. 5. The system according to claim 1 further comprising a hot water heat pump coupled to the electrical grid to receive electrical energy from the electrical grid, the hot water heat pump being coupled to the thermal storage reservoir and operable to remove thermal energy from the thermal storage reservoir for delivery to the premise location to provide heat for heating water at the premise location, the hot water heat pump being operable to remove thermal energy from the thermal storage reservoir independently of whether the system heat pump is delivering thermal energy to the thermal storage reservoir, and wherein the system heat pump is operable to deliver thermal energy to the thermal storage reservoir independently of whether the hot water heat pump is removing heat from the thermal storage reservoir. 6. The system according to claim 1 wherein energy usage at the premise location is estimated for a time block, the estimated energy usage at the premise location for the time block being updated for first time intervals that are of a shorter duration than the time block, actual energy usage being computed at second time intervals shorter than the first time intervals and being used to update the estimated energy usage for the time block, the system heat pump being operated to deliver energy to the thermal storage reservoir based at least in part on the estimated energy usage at the premise location. 7. The system according to claim 6 wherein energy from the electrical grid to the premise location is billed at least at first and second rates, the second rate being a higher rate that is higher than the first rate, the system heat pump being operated in response to control signals from the remote location to deliver more thermal energy to the thermal storage reservoir and to remove more energy from the thermal storage reservoir during times when the rate being charged for the energy to the premise location is being billed at the first rate than during times when the rate being charged for the energy to the premise location is being billed at the second rate. 8. The system according to claim 1 wherein the system heat pump is operated in response to the control signals from the remote location to deliver energy to and to remove energy from the thermal storage reservoir based at least in part upon a temperature forecast for the area in which the premises is located. 9. The system according to claim 8 wherein the system heat pump is operated in response to the control signals from the remote location to deliver energy to the thermal storage reservoir during one or more time intervals of a time block when the forecasted temperature is higher than the forecasted temperature for other time intervals of the time block, and wherein the system heat pump is operated to remove energy from the thermal storage reservoir during one or more time intervals of a time block when the forecasted temperature is lower than the forecasted temperature for other time intervals of the time block. 10. The system according to claim 1 wherein one of said modes comprises a minimize energy use during specified time period mode, wherein one or more time periods are specified during which energy use is to be minimized, the system heat pump being operated a greater amount of time outside the specified time periods to store thermal energy in the thermal storage reservoir outside of the specified time periods, the premises heat pump delivering thermal energy from the thermal storage reservoir to the premises at least in part during the specified time periods to thereby reduce the electrical energy required to be provided from the electrical grid to the premises heat pump during the specified time periods. 11. The system according to claim 1 wherein one of said modes comprises a minimize total energy use mode, wherein based at least in part upon a temperature forecast, the system heat pump for the premise location is operated to store thermal energy in the thermal storage reservoir a greater amount of time during one or more time intervals of a time block when forecasted temperatures are higher than the forecasted temperatures for other time intervals of the time block, and wherein based at least in part upon a temperature forecast, the system heat pump for the premise location is operated to remove thermal energy from the thermal storage reservoir a greater amount of time during one or more time intervals of a time block when forecasted temperatures are lower than the forecasted temperatures for other time intervals of the time block. 12. The system according to claim 1 wherein one of said modes comprises a minimize carbon footprint mode, wherein the system heat pump is operated based in part upon a forecast of carbon per kWh generated by power sources providing electrical energy to the electrical grid, the carbon production from such power sources being forecast at first and second levels, the second level corresponding to a forecasted carbon production of such power sources that is greater than the first level of forecasted carbon production of such power sources, wherein the system heat pump is operated in response to control signals from the remote location to store a greater amount of energy in the thermal storage reservoir at the premise location at times when carbon production from the power sources is forecast to be at the first level than the amount of energy stored in the thermal storage reservoir at times when carbon production of such power sources is forecast to be at the second level. 13. The system according to claim 1 wherein one of said modes comprises a minimize customer premises bill mode when rates charged to the premise location for electrical energy vary, wherein during such mode the system heat pump at the premise location is operated a greater amount of time during time periods when the energy rate being billed to the premise location is at a first rate and is operated a lesser amount of time during time periods when the energy rate being billed to the premises is at a second rate that is higher than the first rate. 14. The system according to claim 13 wherein the system heat pump at the premise location is not operated to deliver energy to the thermal storage reservoir at times when the electrical energy provided to the premises is billed at the second rate. 15. The system according to claim 1 wherein one of said modes in one of said modes and in response to a control instruction from the remote location, the system heat pump for the energy storage system at the premise location is operated at a specified level of operation, the system heat pump at the premise location being a variable speed heat pump. 16. The system according to claim 1 wherein in one of said modes the system heat pump for the premise location is operated to maintain a constant temperature of liquid in the thermal storage reservoir, the constant temperature being within a range of a desired premises temperature. 17. The system according to claim 1 further comprising a first electricity meter operable to measure electrical energy delivered from the electrical grid to the premises and a second meter operable to measure at least one of the thermal energy delivered from the system heat pump to the thermal storage reservoir or removed from the thermal storage reservoir by the system heat pump, wherein the second meter is a Btu meter located at or downstream from the output of the system heat pump. 18. The system according to claim 1 wherein each of a plurality of different premise locations is provided with the system of claim 1. 19. The system according to claim 1 wherein the system heat pump at the premise location is operated in response to the control instructions from the remote location to deliver thermal energy to the thermal storage reservoir during at least some of the time when wind or solar energy sources coupled to the electrical grid in combination with other power generating sources coupled to the electrical grid are producing more power than the electrical demand on the grid or producing more power than forecasted. 20. The system according to claim 17 wherein the first electricity meter measures the electrical energy delivered to the premise location including to the premises heat pump, but not including to the electricity delivered to the system heat pump, the system including a second electricity meter that measures the electricity delivered from the electrical grid to the system heat pump.

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이 특허를 인용한 특허 피인용횟수: 2

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Plural heat pump and thermal storage system for facilitating power shaping services on the electrical power grid at consumer premises

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Plural heat pump and thermal storage system for facilitating power shaping services on the electrical power grid at consumer premises

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이 특허에 인용된 특허 (16)

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IPC 상세정보(version : 201201)

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