Power conditioning apparatus with energy conversion and storage

• US 6,153,943 A
• Filed: 03/03/1999
• Issued: 11/28/2000
• Est. Priority Date: 03/03/1999
• Status: Expired due to Fees

• Current Assignee: Alfred F. Mistr Jr
• Original Assignee: Alfred F. Mistr Jr
• Inventors: Mistr, Alfred F. Jr.
• Primary Examiner(s): PONOMARENKO, NICHOLAS
• Application Number:
  US09/261,341
• Time in Patent Office: 636 Days
• Field of Search: 290/1 R, 290/1 A, 290/2, 290/52, 60/39.01, 60/39.02, 60/39.12, 60/652, 307/64, 307/68
• US Class Current: 290/52
• CPC Class Codes: F02C 6/16 for storing compressed air
• CPC Class Codes: Y02E 60/16 Mechanical energy storage, e.g. flywheels or pressurised fluids

Abstract

A method and apparatus for power conditioning and for storing electrical energy, fossil fuel energy, or both in the form of a compressed gas which may then be used in combination with a fossil fuel to generate conditioned electrical power is disclosed. The present invention provides a method wherein the energy so stored is used as a back-up power source to assure uninterrupted conditioned electrical power in the event of a failure of a primary electrical power source. Turbine rotors are maintained in rotation to provide a spinning reserve in that the inertia of the turbines can be used to generate power in the event of minor power disruptions, and the turbines can be powered for producing power in the event of greater power disruptions. The present invention provides an apparatus that enhances the flexibility and efficiency of a power consumer and the internconnected power providing system by allowing the user to have an efficient spinning reserve of power, by providing the capability of a user to shape the load, thereby reducing the spinning reserve requirement of the interconnected system, and to sell excess power and to control transportation costs. Since the present invention allows a user to purchase power from the most efficient source, the present invention promotes efficiency throughout the power generation and power transportation industry.

Claims

1. A power conditioning apparatus with energy conversion and storage capabilities for use to supplement power supplied to a load from a commercial power source, to operate using electrical power from an electrical power source, to operate using fossil fuel from a fuel power source, to provide an auxiliary power source, power conditioning and load shaping, said apparatus comprising:

a rotary power shaft;

a compression turbine connected to said rotary power shaft for being driven by said rotary power shaft, said compression turbine including a compression turbine housing defining a compression turbine cavity;

an expansion turbine connected to said rotary power shaft for driving said rotary power shaft, said expansion turbine including an expansion turbine housing defining an expansion turbine cavity;

a motor/generator connected to said rotary power shaft for selectively driving and being driven by said rotary power shaft, said motor/generator and said expansion turbine being selectively operable individually and in combination to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

a gas storage reservoir selectively connectable to said compression turbine and said expansion turbine;

an electrical circuit for providing electrical communication between said motor/generator, the power source and the load; and

means for controlling the operation of said apparatus including means for monitoring electrical and mechanical conditions within said power conditioner, means for monitoring the power supply and means for controlling electrical and mechanical control devices associated with said power conditioning apparatus, said means for controlling electrical and mechanical control devices including means for selecting operation of said motor/generator and said expansion turbine to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed.

2. A power conditioning apparatus according to claim 1 wherein said means for controlling the operation of said system includes a preprogrammed computer, said electrical control devices include a plurality of switches disposed within said electrical circuit in communication with said computer, said mechanical control devices include a plurality of remotely actuable valves operatively connected to said compression turbine, said expansion turbine and said computer.

3. A power conditioning apparatus according to claim 2 wherein said computer includes a modem for communication with remote sources of energy and said computer is configured to determine the cost of energy available to the apparatus and to select one or more energy sources based on an internally calculated cost analysis.

4. A power conditioning apparatus according to claim 2 wherein said computer is configured to monitor the presence and absence of power available from the power source and to activate said expansion turbine to drive said motor/generator responsive to the absence of power from the power source.

5. A power conditioning apparatus according to claim 2 wherein said computer is configured to operate said apparatus for load shaping by monitoring said power source for a predetermined fixed power value and activating said expansion turbine to drive said motor/generator responsive to said computer determining that said power value is below said fixed power value and activating said compression turbine to charge said gas reservoir responsive to said computer determining that said power value is greater that said fixed power value.

6. A power conditioning apparatus according to claim 2 further comprising a vacuum apparatus operatively connected to said computer, said compression turbine and said expansion turbine for selective evacuation of said compression cavity, said expansion cavity or both to assist in maintaining rotation of said compression turbine and said expansion turbine at a nominal operational speed.

7. A power conditioning apparatus with energy conversion and storage for converting and storing electrical energy, fossil fuel energy, or both in the form of a compressed gas, the gas being obtained from a gas supply and compressed using said apparatus, for selective release and use in the production of electrical power, said apparatus comprising:

a motor/generator having an electrical supply connection for selectively receiving, supply power from an AC power source, and an electrical load connection for selectively providing conditioned AC power to a load;

a first rotary power shaft operatively attached to said motor/generator;

means for power shaft coupling attached to said first rotary power shaft;

a second rotary power shaft coupled to said first rotary power shaft using said means for power shaft coupling;

a compression turbine including a compression turbine housing defining a compression cavity and having a compression rotor disposed within said compression cavity, said compression rotor being operatively attached to said second rotary power shaft for rotation therewith, said compression turbine housing further defining an intake port in fluid communication with said compression cavity and selectively in fluid communication with a supply of gas;

an expansion turbine including an expansion turbine housing defining an expansion cavity and having an expansion rotor disposed within said expansion cavity, said expansion rotor being operatively attached to said second rotary power shaft for rotation therewith, said expansion turbine housing further defining a fuel supply port and an exhaust port in fluid communication with said expansion cavity, said fuel supply port being, in fluid communication with a regulated fossil fuel supply, said expansion turbine and said motor/generator being selectively operable individually and in combination to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

a vacuum apparatus operatively connected to both said compression cavity and said expansion cavity for selective evacuation of said compression cavity said expansion cavity or both to assist in maintaining rotation of said compression turbine, and said expansion turbine at a nominal operational speed;

a gas storage reservoir in fluid communication with said compression turbine for receipt and pressurized storage of gas compressed by said compression turbine, said reservoir being in fluid communication with said expansion turbine for selective flow of said compressed gas from said gas storage reservoir into said expansion turbine to drive said expansion turbine;

means for controlling gas flow between said compression turbine and said gas storage reservoir;

means for controlling, as flow between said gas storage reservoir and said expansion turbine;

means for electrically isolating the AC power source from said electrical supply connection; and

a control system for controlling the operation of said power conditioning apparatus including means for monitoring electrical and mechanical conditions within said power conditioning apparatus, means for monitoring the power supply and means for controlling electrical and mechanical control devices associated with said power conditioning apparatus, said means for controlling electrical and mechanical control devices including, means for selecting operation of said motor/generator and said expansion turbine to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed.

8. A power conditioning apparatus with energy conversion and storage according to claim 7 wherein said gas supply is an air supply, and said gas storage reservoir is an air storage reservoir.

9. A power conditioning apparatus with energy conversion and storage according to claim 7 wherein said control system includes a preprogrammed computer and said means for controlling gas flow between said compression turbine and said gas storage reservoir and said means for controlling gas flow between said gas storage reservoir and said expansion turbine include remotely actuable valves selectively operable by said computer.

10. A power conditioning apparatus with energy conversion and storage according to claim 9 and further comprising a plurality of electrical switches for controlling electricity flow within said power conditioning apparatus, said switches being remotely selectively actuable responsive to said computer.

11. A power conditioning apparatus with energy conversion and storage according to claim 10 and further comprising means associated with said computer for communication between said computer and an entity remotely disposed from said power conditioning apparatus.

12. A power conditioning apparatus with energy conversion and storage according to claim 11 wherein said remotely disposed entity is a commercial electrical power source.

13. A power conditioning apparatus with energy conversion and storage according to claim 11 wherein said remotely disposed entity is a commercial fossil fuel power source.

14. A power conditioning apparatus with energy conversion and storage according to claim 7 and further comprising means for voltage spike protection electrically operable between the AC power source and said electrical supply connection.

15. A power conditioning apparatus with energy conversion and storage according to claim 14 wherein said means for voltage spike protection comprises a predetermined arrangement of inductors and metal oxide varistors.

16. A power conditioning apparatus with energy conversion and storage according to claim 7 further comprising means for harmonic filtering connected to said electrical load connection of said motor/generator.

17. A power conditioning apparatus with energy conversion and storage according to claim 16 wherein said means for harmonic filtering comprises a grounded wye capacitor bank.

18. A power conditioning apparatus with energy conversion and storage according to claim 7 further comprising means of recovering heat connected to said compression turbine housing and said expansion turbine housing.

19. A power conditioning apparatus with energy conversion and storage according to claim 7 further comprising a heat exchanger connected to said means for controlling gas flow between said gas storage reservoir and said expansion turbine, said heat exchanger assisting in the prevention of ice formation.

20. A power conditioning apparatus with energy conversion and storage according to claim 7 further comprising means for operably connecting said vacuum apparatus to said second rotary power shaft, thereby powering said vacuum apparatus.

21. A power conditioning apparatus with energy conversion and storage according to claim 7 wherein said control system includes means for detecting interruption and restoration of electrical power from the AC power source.

22. A method of storing electrical energy in the form of a compressed gas for selective release and use in the production of electrical power, said method comprising the following steps:

providing a power conditioning apparatus including a rotary power shaft;

an expansion turbine including an expansion turbine housing defining an expansion cavity, an exhaust port in fluid communication with said expansion cavity, and a fuel supply port selectively in fluid communication with a regulated fuel supply, said expansion turbine also including an expansion turbine rotor disposed within said expansion cavity, said expansion turbine rotor being operatively attached to said rotary power shaft;

a compression turbine including a compression turbine housing, defining a compression cavity and an intake port in fluid communication with said compression cavity and selectively in fluid communication with a gas supply, said compression turbine also including a compression turbine rotor disposed within said compression cavity, said compression turbine rotor being operatively attached to said rotary power shaft,

a gas storage reservoir selectively in fluid communication with said compression cavity and said expansion cavity;

a motor/generator operatively connected to said rotary power shaft and selectively connectable to an AC power source and to an electrical load, said motor/generator and said expansion turbine being selectively operable individually and in combination to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

a vacuum apparatus operatively connected to said expansion cavity and to said compression cavity for selective evacuation of said expansion cavity said compression cavity or both to assist in maintaining rotation of said compression turbine and said expansion turbine at a nominal operational speed;

a control system for controlling the operation of said power conditioning apparatus including means for monitoring electrical and mechanical conditions within said power conditioning apparatus, means for monitoring the AC power source and the electrical load and means for controlling electrical and mechanical control devices associated with said power conditioning apparatus, said means for controlling electrical and mechanical control devices including means for selecting operation of said motor/generator and said expansion turbine to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

connecting said motor/generator to the AC power source, thereby powering said motor/generator, thereby rotating said rotary power shaft, thereby rotating said expansion turbine rotor and said compression turbine rotor;

evacuating said expansion cavity using said vacuum apparatus to assist in maintaining, rotation of said expansion turbine and said compression turbine to provide enhanced responsiveness to a change in operating mode;

pressurizing said gas storage reservoir by compressing gas from the gas supply using said compression turbine and directing the compressed gas from said compression turbine into said gas storage reservoir;

terminating pressurization of said gas storage reservoir by obstructing the flow of gas from the gas supply to said compression turbine and obstructing the flow of compressed gas from said compression turbine into said gas storage reservoir;

evacuating said compression cavity using said vacuum apparatus to assist in maintaining rotation of the compression rotor;

isolating said motor/generator from the AC power source and substantially simultaneously initiating electrical power generation by directing compressed gas to flow from said gas storage reservoir into said expansion turbine, and directing fuel to flow from the regulated fuel supply into said expansion turbine and igniting said fuel along with said compressed gas thereby powering said expansion turbine, thereby maintaining rotation of said rotary power shaft, thereby powering said motor/generator, thereby supplying electricity to said electrical load; and

terminating electrical power veneration by obstructing flow of compressed gas from said gas storage reservoir into said expansion turbine, obstructing fuel flow from said regulated fuel supply into said expansion turbine and substantially simultaneously restoring connection of said motor/generator to the AC power source to maintain rotation of said expansion turbine and said compression turbine.

23. A method according to claim 22 wherein said method is used to provide uninterruptable AC power and further comprises the following steps:

detecting interruption of power from the AC power source after pressurization of gas storage reservoir and evacuation of compression cavity, said interruption being immediately followed by the step wherein the motor/generator is isolated from the AC power source and electrical power generation is initiated; and

detecting restoration of power from the AC power source, said restoration being immediately followed by the step wherein electrical power generation is terminated.

24. A method according to claim 22 and further comprising the following steps:

during electrical power generation, further pressurizing said gas storage reservoir by compressing gas from the gas supply using said compression turbine and directing the compressed gas into said air storage reservoir; and

following termination of electrical power generation, evacuating said compression cavity using said vacuum apparatus to assist in maintaining rotation of the compression turbine and the expansion turbine.

25. A method according to claim 22 wherein said control system includes a preprogrammed computer, a plurality of remotely actuable, computer controlled valves and a plurality of remotely actuable, computer controlled switches, said valves being disposed within said system to obstruct gas, fuel and exhaust flow, and said switches being disposed within said system to control and direct current.

26. A method according to claim 25 and further comprising the steps of providing a communication system associated with said computer for communication between said computer and a remote source of energy, and establishing communication with the remote source of energy, monitoring energy rates using said computer, determining the most economical configuration for said apparatus using said computer and the energy rates obtained thereby, and configuring said apparatus to operate in a mode that will provide the most economical energy usage as determined by said computer.

27. A method according to claim 26 and further comprising the steps of maintaining rotation of said expansion turbine and said compression turbine at a nominal operational speed, and bringing said expansion turbine online using said computer controlled valves when said computer determines that it is cost effective to bring said expansion turbine online.

28. A method according to claim 26 and further comprising the steps of maintaining rotation of said expansion turbine and said compression turbine at a nominal operational speed, and bringing said compression turbine online using said computer controlled valves when said computer determines that it is cost effective to bring said compression turbine online.

29. A method of storing electrical and fossil fuel energy in the form of compressed air for selective release and use in the production of electrical power, said method comprising the following steps:

providing a power conditioning apparatus including a rotary power shaft;

an expansion turbine including an expansion turbine housing defining an expansion cavity, an exhaust port in fluid communication with said expansion cavity and a fuel supply port selectively in fluid communication with a regulated fuel supply, said expansion turbine also including an expansion turbine rotor disposed within said expansion cavity, said expansion turbine rotor being operatively attached to said rotary power shaft;

a compression turbine including a compression turbine housing defining a compression cavity and an intake port in fluid communication with said compression cavity and selectively in fluid communication with an air supply, said compression turbine also including a compression turbine rotor disposed within said compression cavity, said compression turbine rotor being operatively attached to said rotary power shaft;

an air storage reservoir selectively in fluid communication with said compression cavity and said expansion cavity;

a motor/generator operatively connected to said rotary power shaft and selectively connectable to an AC power source and to an electrical load, said motor/generator and said expansion turbine being selectively operable individually and in combination to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

a vacuum apparatus operatively connected to said expansion cavity and to said compression cavity for selective evacuation of said expansion cavity, said compression cavity or both to assist in maintaining rotation of said compression turbine and said expansion turbine at a nominal operational speed;

a control system for controlling the operation of said power conditioning apparatus including means for monitoring electrical and mechanical conditions within said power conditioning apparatus, means for monitoring the AC power source and the electrical load and means for controlling electrical and mechanical control devices associated with said power conditioning apparatus, said means for controlling electrical and mechanical control devices including means for selecting operation of said motor/generator and said expansion turbine to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

connecting said motor/generator to the AC power source, thereby powering said motor/generator, thereby rotating said rotary power shaft, thereby rotating said expansion turbine rotor and said compression turbine rotor;

evacuating said expansion cavity using said vacuum apparatus to assist in maintaining rotation of said expansion turbine rotor;

pressurizing said air storage reservoir by compressing air from the air supply using said compression turbine and directing the compressed air into said air storage reservoir until pressure in said air storage reservoir reaches operating pressure of said expansion turbine;

isolating said motor/generator from the AC power source and substantially simultaneously initiating further pressurization of said air storage reservoir and initiating generation of electrical power by directing compressed air to flow from said air storage reservoir into said expansion turbine and substantially simultaneously directing fuel to flow from the regulated fuel supply into said expansion turbine and igniting said fuel along with said compressed air, thereby powering said expansion turbine, thereby maintaining rotation of said rotary power shaft, thereby powering said compression turbine, thereby compressing air from said air supply and directing the compressed air into said air storage reservoir, said rotation of said rotary power shaft further powering said motor/generator, thereby supplying electricity to said electrical load;

terminating air storage reservoir pressurization and electrical power generation by obstructing flow of compressed air from said air storage reservoir into said expansion turbine and obstructing flow of fuel from said regulated fuel supply into said expansion turbine;

reconnecting said motor/generator to the AC power source, thereby powering said motor/generator, thereby maintaining rotation of said rotary power shaft;

evacuating said compressor cavity and said expansion cavity using said vacuum apparatus to assist in maintaing rotation of said expansion turbine rotor and said compression turbine rotor;

isolating said motor/generator from the AC power source and substantially simultaneously initiating electrical power generation by directing compressed air and fossil fuel to flow from said expansion turbine, igniting said compressed air and fossil fuel, thereby powering said expansion turbine, thereby maintaining rotation of said rotary power shaft, thereby powering said motor/generator, thereby supplying electricity to said electrical load; and

terminating electrical power generation by obstructing flow of compressed air and fossil fuel into said expansion turbine and substantially simultaneously restoring connection of said motor/generator to the AC power source.

30. A method according to claim 29 wherein said control system includes a preprogrammed computer, a plurality of remotely actuable, computer controlled valves and a plurality of remotely actuable, computer controlled switches, said valves being disposed within said system to obstruct gas and exhaust flow, and said switches being disposed within said system to control and direct current.

31. A method according to claim 30 and further comprising the steps of providing a communication system associated with said computer for communication between said computer and a remote source of energy, and establishing communication with the remote source of energy, monitoring energy rates using said computer, determining the most economical configuration for said apparatus using said computer and the energy rates obtained thereby, and configuring said apparatus to operate in a mode that will provide the most economical energy usage as determined by said computer.

32. A method according to claim 29 and further comprising the steps of maintaining rotation of said expansion turbine and said compression turbine at a nominal operational speed, and bringing said expansion turbine online using said computer controlled valves when said computer determines that it is cost effective to bring said expansion turbine online.

33. A method according to claim 29 and further comprising the steps of maintaining rotation of said expansion turbine and said compression turbine at a nominal operational speed, and bringing said compression turbine online using said computer controlled valves when said computer determines that it is cost effective to bring said compression turbine online.

34. A method according to claim 33 wherein said method is used to provide uninterruptable AC power and further comprises the following steps:

detecting interruption of power from the AC power source using said control system after pressurization of gas storage reservoir and evacuation of compression cavity, said interruption being immediately followed by the step wherein the motor/generator is isolated from the AC power source and electrical power generation is initiated; and

detecting restoration of power from the AC power source using said control system, said restoration being immediately followed by the step wherein electrical power generation is terminated.

35. A method for load shaping using a power conditioning apparatus with energy conversion and storage capabilities, said method comprising the steps of:

providing a rotary power shaft;

a compression turbine connected to said rotary power shaft for being driven by said rotary power shaft;

an expansion turbine connected to said rotary power shaft for driving said rotary power shaft;

a motor/generator connected to said rotary power shaft for selectively driving and being driven by said rotary power shaft, said motor/generator and said expansion turbine being selectively operable individually and in combination to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

a gas storage reservoir selectively connectable to said compression turbine and said expansion turbine;

a vacuum apparatus operatively connected to both said compression cavity and said expansion cavity for selective evacuation of said compression cavity said, expansion cavity or both to assist in maintaining rotation of said compression turbine and said expansion turbine at a nominal operational speed;

an electrical circuit for providing electrical communication between said motor/generator, the power source and the load; and

means for controlling the operation of said apparatus including means for monitoring electrical and mechanical conditions within said power conditioner;

means for monitoring the power source and means for controlling electrical and mechanical control devices associated with said power conditioning apparatus, said means for controlling electrical and mechanical control devices including means for selecting operation of said motor/generator and said expansion turbine to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

monitoring the power available from said power source based on a predetermined threshold power value using said means for monitoring the power source;

activating said expansion turbine in a configuration to provide supplemental power, based on a determination by said means for monitoring said power source that the power available from said power source is less than said threshold value; and

activating said compression turbine in a configuration to charge said, as reservoir, based on a determination by said means for monitoring said power source that the power available from said power source is greater than said threshold value.

36. A method for power conditioning using a power conditioning apparatus with energy conversion and storage capabilities, said method comprising, the steps of:

providing a rotary power shaft;

a compression turbine connected to said rotary power shaft for being, driven by said rotary power shaft;

an expansion turbine connected to said rotary power shaft for driving said rotary power shaft;

a motor/generator connected to said rotary power shaft for selectively driving and being driven by said rotary power shaft, said motor/generator and said expansion turbine being selectively operable individually and in combination to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

a gas storage reservoir selectively connectable to said compression turbine and said expansion turbine;

a vacuum apparatus operatively connected to both said compression cavity and said expansion cavity for selective evacuation of said compression cavity, said expansion cavity or both to assist in maintaining rotation of said compression turbine and said expansion turbine at a nominal operational speed;

an electrical circuit for providing electrical communication between said motor/generator, the power source and the load; and

means for controlling the operation of said apparatus including means for monitoring electrical and mechanical conditions within said power conditioner;

means for monitoring the power source and means for controlling electrical and mechanical control devices associated with said power conditioning apparatus, said means for controlling electrical and mechanical control devices including means for selecting operation of said motor/generator and said expansion turbine to maintain rotation of said expansion turbine and said compression turbine at a nominal operational speed;

maintaining rotation of said compression turbine and said expansion turbine at a nominal operational speed;

monitoring the power available from said power source using said means for monitoring the power source; and

providing power to the load using said expansion turbine in the event that said means for monitoring the power source determines that power is not present from said power source.