ENERGY NETWORK USING ELECTROLYSERS AND FUEL CELLS

• US 20060208571A1
• Filed: 05/18/2006
• Published: 09/21/2006
• Est. Priority Date: 01/23/2004
• Status: Abandoned Application

• Current Assignee: Stuart Energy Systems Corp (Cummins Incorporated)
• Original Assignee: Stuart Energy Systems Corp (Cummins Incorporated)
• Inventors: Fairlie, Matthew
• Application Number:
  US11/383,997
• Publication Number:
  US 20060208571A1
• Time in Patent Office: Days
• US Class Current: 307/11
• CPC Class Codes: F17D 1/04 for distribution of gas
• CPC Class Codes: F17D 5/08 Protection of installations or persons from the effects of high voltage induced in the pipe-line emergency protective circuit arrangements H02H
• CPC Class Codes: H01M 8/04089 of gaseous reactants
• CPC Class Codes: H01M 8/04313 characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
• CPC Class Codes: H01M 8/04694 characterised by variables to be controlled
• CPC Class Codes: H01M 8/04955 Shut-off or shut-down of fuel cells
• CPC Class Codes: H01M 8/0656 by electrochemical means H01M8/065 takes precedence
• CPC Class Codes: H01M 8/184 Regeneration by electrochemical means
• CPC Class Codes: H02J 2310/58 The condition being electrical
• CPC Class Codes: H02J 2310/64 The condition being economic, e.g. tariff based load management
• CPC Class Codes: H02J 3/144 Demand-response operation of the power transmission or distribution network
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: Y02E 60/34 Hydrogen distribution
• CPC Class Codes: Y02E 60/36 Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 90/45 Hydrogen technologies in production processes
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

An energy network is provided. An embodiment includes a network having a plurality of power stations and a plurality of loads interconnected by an electricity grid. The loads include electrolysers. The network also includes a controller that is connected to both the stations and the loads. The controller is operable to vary the available power from the power stations and/or adjust the demand from the electrolysers to provide a desired match of availability with demand and produce hydrogen as a transportation fuel with specific verifiable emission characteristics

Claims

1. An energy network comprising:

a plurality of electricity generating stations;

a plurality of variable power loads connected to said generating stations by a grid; and

,

a controller connected to said grid and operable to adjust demand from said power loads to approach a match of said demand with an availability of power from said generating stations.

2. The network of claim 1 further comprising at least one generating station having a variable availability such that said controller is operable to adjust availability from said generating station to match said demand.

3. The network of claim 2 further comprising a data network connected to said controller, said network providing additional information about said demand and said availability to said controller and which is used by said controller to determine whether to adjust at least one of said demand and said availability to approach a match there between.

4. The network of claim 3 wherein said match is based at least in part on determining which of a plurality of adjustments produces a reduced amount of harmful emissions in comparison to another adjustment.

5. The network of claim 3 wherein said match is based at least in part on determining which of a plurality of adjustments has a least amount of financial cost in the marginal cost required to produce electricity.

6. The network of claim 3 wherein said variable power loads include at least one water electrolyser for converting electricity into hydrogen.

7. The network of claim 6 wherein said electrolyser has a known schedule of production.

8. A controller for an energy network having a plurality of electrical generating stations and a plurality of power loads connected to said generating stations by a grid, said controller comprising a processor having a plurality of programming instructions operable to adjust demand from said power loads to match said demand with an availability of power from said generating stations.

9. The controller of claim 8 wherein said network further includes at least one generating station having a variable availability such that said processor is operable to adjust availability from said generating station to match said demand.

10. The controller of claim 9 wherein said network further includes a data network connected to said controller, said network providing additional information about said demand and said availability to said controller and which is used by said controller to determine whether to adjust at least one of said demand and said availability to approach a match there between.

11. The controller of claim 9 wherein said match is based at least in part on determining which of a plurality of adjustments produces a reduced amount of harmful emissions in comparison to another adjustment.

12. The controller of claim 9 wherein said match is based at least in part on determining which of a plurality of adjustments has a least amount of financial cost in the marginal cost required to produce electricity.

13. The controller of claim 9 wherein said variable power loads include at least one electrolyser for converting electricity into hydrogen.

14. The controller of claim 13 wherein said electrolyser has a known schedule of production.

15. An electrolyser for receiving electrical power from a grid and for converting electricity into hydrogen, said electrolyser including a means to report a demand for electricity needed to generate hydrogen at said electrolyser to a controller connected to said grid, such that when said demand is reported to said controller, said controller is operable to adjust availability of power from said grid to meet said demand based on said reported demand.

16. The electrolyser of claim 15 wherein said grid includes a plurality of electrical generating stations and said controller is operable to increase availability from a selected one of said generating stations to match said demand.

17. The electrolyser of claim 16 wherein said electrical generating stations include at least one of a nuclear power plant, a coal fired power plant, a natural gas power plant, a wind farm, a solar power farm, a hydroelectric dam, and a hydrogen cell for converting hydrogen to electricity.

18. The electrolyser of claim 16 wherein said match is based at least in part on determining which of a plurality of adjustments produces a reduced amount of harmful emissions from at least one of said generating stations in comparison to another adjustment.

19. The electrolyser of claim 18 further comprising a means for determining a fee charged for HPVs obtaining fuel from said electrolyser, said fee being determined at least in part based on a cost associated with said emissions.

20. The electrolyser of claim 19 wherein said fee is based on a fuel tax-exemption based on fuel having emission characteristic better than a pre-defined profile of an existing fuel for existing vehicles that consume substantially the same amount of energy as said HPVs.

21. The electrolyser of claim 15 wherein said match is based at least in part on determining which of a plurality of adjustments results in a least amount of financial cost in the marginal cost of electricity required to produce hydrogen from said electrolyser.

22. The electrolyser of claim 15 wherein said demand is based on a known schedule of production.

23. A method of transferring hydrogen comprising the steps of:

converting, at a first location, a predefined quantity of hydrogen into electricity;

introducing said electricity into a electricity grid;

notifying a second location of a quantity of said electricity;

drawing, at said second location, said quantity of electricity from said grid; and

,

converting, at said second location, said drawn quantity of electricity into hydrogen.

24. A method of transferring hydrogen comprising the steps of:

receiving at a first hydrogen storage station a request to transfer hydrogen to a second storage station;

converting a predefined quantity of hydrogen into electricity corresponding to said request;

introducing said electricity into an electricity grid.

25. A method of generating hydrogen comprising the steps of:

receiving at a hydrogen storage station a notification that a predefined quantity of electricity has been introduced into an electricity grid connected to said hydrogen storage station;

drawing, at said hydrogen storage station, said quantity of electricity from said grid; and

,

converting, at said hydrogen storage station, said drawn quantity of electricity into hydrogen.

26. A method of controlling an energy network comprising the steps of:

receiving demand information representing an amount of electricity in demand by at least one electrical load, said at least one electrical load including an electrolyser for converting electricity into hydrogen;

receiving availability information representing an amount of electricity availability from at least one electrical generating station; and

,

adjusting operation of said at least one of electrical load and said at least one electrical generating such that said demand information and said availability information approach a match there between.

27. The method of claim 26 wherein said adjusting step comprises the steps of:

determining if said demand exceeds said availability, in which case performing the steps of;

(i) increasing availability if additional availability is available;

(ii) decreasing said demand if said availability is not available;

determining if said availability exceeds said demand, in which case performing the steps of;

(i) increasing demand if additional demand is available;

(ii) decreasing availability if additional demand is not available.

28. The method of claim 26 wherein said availability information includes a cost associated with producing electricity and said adjusting step includes a determination of a desired cost optimization based on said cost and a decision whether to adjust availability or demand based on said cost optimization.

29. The method of claim 28 wherein said cost is determined based on a marginal cost of electricity to produce hydrogen.

30. The method of claim 28 wherein said cost is determined based on an emission cost associated with producing electricity.

31. The method of claim 28 wherein said cost is determined based on a emission cost associated with the application using hydrogen produced by said electrolyser.

32. The method of claim 31 wherein said application is a hydrogen powered vehicle and said emission cost is determined based on at least one of a) associating a emission cost associated with a non-hydrogen vehicle with a emission profile generated by a power station producing electricity for said electrolyser and b) comparing said emission cost with forms of hydrogen generation other than said electrolyser.

33. The method of claim 26 wherein said at least one electrical load additionally includes a set of conventional loads.

34. The method of claim 26 wherein said at least one generating station includes a first power station having an availability profile that is substantially fixed and a second power station having an availability profile that is substantially random.

35. The method of claim 34 wherein when electricity from said second power station is available and if said availability exceeds said demand then at said operating step said demand from said electrolyser is increased.

36. The method of claim 34 wherein when electricity from said second power station is unavailable and if said demand exceeds said availability then at said operating step said demand from said electrolyser is decreased.

37. The method of claim 34 wherein said first power station is a nuclear power station and said second power station is a wind farm.

38. The method of claim 26 wherein said electrical load includes a plurality (“

K”

) of electrolysers and said demand is based at least in part on the following;

TotalElectricPowerDemandOfElectrolysers(t)=Σ

_k=1^K(RateOfFuelProduction_k(t)×

SpecificEnergyConsumptionForHydrogenProductionAtStation_k(t))
wherein
Σ

_k=1^KRateOfFuelProduction_k(t)=TotalRateOfHydrogenProduction(t)

where K=number of electrolysers; and

t=time.

which is in balance with power supplied by captive power sources, J in number, and available power from the grid;

TotalElectricPowerDemandOfElectrolysers(t)=Σ

_j=1^JPowerForElectrolysisFromCaptivePowerSource_j(t)+PowerForElectrolysisFromGrid(t)

where J=number of captive generators; and

t=time.

such that over a predefined period the following requirements are met, acting as constraints to RateOfFuelProduction and the optimization process;

FuelAvailableInStation_k(t+Δ

t)=FuelInventory_k(t)+(RateOfFuelProduction_k(t)−

RateOfFuelConsumption_k(t))×

Δ

t≧

CustomerDemandForFuelAtStation_k(t+Δ

t,FuelSellingPrice)≦

MaximumStorageCapacityOfStation_k

where t=time.

39. The method of claim 26 wherein said demand information is based at least in part on a measured amount of stored hydrogen fuel available at said electrolyser, said measured amount being based at least one of a) pressure, temperature, volume in compressed storage tanks and b) pressure, temperature, volume, mass of metal hydride in metal hydride hydrogen gas storage.

40. The method of claim 26 wherein said availability information includes at least one of a type of emission created by each power station, a type of fuel used by each power station, an efficiency rating for each power station, and a response time for deactivating or activating each power station.

41. The method of claim 26 wherein said availability information includes one or more types and quantities of emission produced per unit of electricity produced for each power station.

42. The method of claim 41 wherein said power station burns hydrocarbons and said types and quantities of emissions includes a measurement in mass of emitted CO₂, NO, CO per kWh of electricity produced by said power station.

43. The method of claim 42 wherein said demand information includes an emission penalty associated with that load and said adjusting step is made at least in part by adjusting availability at one of said power stations having a reduced amount of pollutants produced per kWh in relation to another one of said power stations.

44. The method of claim 26 wherein said demand information includes at least one of a type for each load, and whether an emission penalty is associated with that type of said load.

45. The method of claim 26 wherein said demand information for an electrolyser includes an amount of hydrogen currently being stored at said electrolyser and a consumption forecast for said stored hydrogen.

46. An energy network comprising:

a plurality of generating stations;

a plurality of power loads connected to said generating stations by a grid, said power loads including at least one electrolyser;

a fuel cell connected to at least one of said electrolysers for converting hydrogen back into electricity for reintroduction to said grid; and

,

a controller connected to said grid and operable to adjust demand from said power loads to approach a match of said demand with an availability of power from said generating stations, wherein said adjustment of availability includes activating said fuel cell for delivery of electricity to said grid.

47. An energy network comprising:

a plurality of generating stations;

a plurality of power loads connected to said generating stations by a grid, said power loads including at least one electrolyser; and

,

a controller connected to said grid and operable to adjust demand from said power loads to approach a match of said demand with an availability of power from said generating stations, wherein said adjustment of demand includes activating one or more of said electrolysers to absorb excess availability from said generating stations.

48. A method of increasing stability in an electricity grid comprising the steps of:

receiving demand information representing a change in the amount of electricity in demand by at least one conventional electrical load connected to said grid;

receiving availability information from a plurality of electrical generating stations connected to said grid representing a potential instability in adjusting said availability from said generating stations to accommodate said change;

absorbing a decrease in demand causing said instability by activating at least one electrolyser connected to said grid; and

,

absorbing a decrease in availability causing said instability by activating at least one fuel cell or turning down one electrolyser connected to said grid.

49. A method of controlling an energy network comprising the steps of:

receiving demand information representing an amount of electricity in demand by at least one electrical load, said at least one electrical load including an industrial electrolyser for converting electricity into hydrogen;

receiving availability information representing an amount of electricity availability from at least one electrical generating station; and

,

instructing said industrial electrolyser to reduce production of hydrogen based on said availability information being less than said demand information according to an interuptibility contract.