Method and apparatus for using wind turbines to generate and supply uninterrupted power to locations remote from the power grid

• US 6,927,503 B2
• Filed: 10/04/2002
• Issued: 08/09/2005
• Est. Priority Date: 10/05/2001
• Status: Expired due to Term

• Current Assignee: Ben M. Enis, Paul Lieberman
• Original Assignee: Ben M. Enis, Paul Lieberman
• Inventors: Enis, Ben M., Lieberman, Paul
• Primary Examiner(s): Waks, Joseph
• Application Number:
  US10/263,848
• Publication Number:
  US 20030105556A1
• Time in Patent Office: 1,040 Days
• Field of Search: 290/44, 290/55, 621/72, 624/01
• US Class Current: 290/55
• CPC Class Codes: F02C 6/16 for storing compressed air
• CPC Class Codes: F03D 15/10 using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
• CPC Class Codes: F03D 9/10 Combinations of wind motors with apparatus storing energy
• CPC Class Codes: F03D 9/11 storing electrical energy
• CPC Class Codes: F03D 9/17 storing energy in pressurised fluids
• CPC Class Codes: F03D 9/18 storing heat
• CPC Class Codes: F03D 9/257 the wind motor being part of a wind farm
• CPC Class Codes: F03G 6/064 having a gas turbine cycle, i.e. compressor and gas turbine combination
• CPC Class Codes: F05B 2270/1033 Power (if explicitly mentioned)
• CPC Class Codes: F05D 2270/053 Explicitly mentioned power
• CPC Class Codes: Y02E 10/46 Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 60/16 Mechanical energy storage, e.g. flywheels or pressurised fluids
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

The present invention relates to a wind energy generating and storing system comprising methods and apparatuses for providing energy dedicated for immediate use and energy storage, to provide electrical power on an uninterrupted and continous basis, to locations remote from an electrical power grid. In a large application, the invention contemplates having a predetermined number of windmills dedicated for immediate use, and a predetermined number of windmills dedicated for energy storage, as compressed air energy in one or more high pressure tanks. A hybrid windmill having the ability to simultaneously switch between energy for immediate use and energy storage can also be provided.

Claims

1. A wind energy generating and storage system, comprising:

a plurality of ground based windmill stations located in a predetermined area, wherein said plurality of windmill stations is divided into at least two kinds;

a predetermined number of first windmill stations having a first wind turbine and an electrical generator adapted and exclusively dedicated to converting wind energy into electrical energy for immediate use; and

a predetermined number of second windmill stations having a second wind turbine adapted and exclusively dedicated to storing energy produced by the wind in at least one storage tank, wherein at least one compressor is provided to compress air into said tank, at least one expander is provided to release the compressed air from said tank, and a second generator is provided to convert compressed air energy into electrical energy.

2. The system of claim 1, wherein at least one heating device is provided to heat the compressed air that is released and expanded.

3. The system of claim 2, wherein said at least one heating device is taken from the group consisting of the following:

a. a device which derives heat from solar energy;

b. a device or mass which derives heat from said at least one compressor;

c. a heating device which uses its own energy source;

d. a heat exchanger having tubes extending through said tank, wherein a heated fluid can be passed through said tubes to increase the temperature of the air inside said tank.

4. The system of claim 1, wherein the predetermined number of said first windmill stations and the predetermined number of said second windmill stations are based on the wind characteristics of the area where the stations are located and the use characteristics of the area where the energy from the system is used.

5. The system of claim 1, wherein a refrigerating device is operatively connected to said system to enable the cold temperatures generated by said compressed air being released and expanded to be used for refrigeration purposes.

6. The system of claim 1, further comprising a predetermined number of hybrid stations which can be simultaneously switched between providing energy for immediate use and providing energy for storage.

7. The system of claim 6, wherein said hybrid stations each comprise a wind turbine for generating mechanical power, a splitter for splitting the mechanical power generated by said hybrid stations, wherein said splitter is capable of simultaneously apportioning and adjusting the amount of mechanical power between a first converter for generating electricity for immediate use, and a second converter for generating compressed air energy into at least one tank.

8. A method of generating and storing energy, comprising:

providing a predetermined number of first windmill stations, each having a wind turbine and an electrical generator adapted and dedicated to converting wind energy into electrical energy for immediate use;

providing a predetermined number of second windmill stations having a second wind turbine adapted and dedicated to storing energy produced by the wind in at least one storage tank, wherein at least one compressor is provided to compress air into said tank, at least one expander is provided to release the compressed air from said tank, and at least a second generator is provided to convert compressed air energy into electrical energy; and

providing a predetermined number of hybrid windmill stations having a third wind turbine adapted and dedicated to converting wind energy into electrical energy for immediate use, and/or storing energy produced by the wind, wherein said hybrid windmill stations can be switched between providing energy for immediate use and providing energy for storage.

9. The method of claim 8, wherein the predetermined numbers of said first, second and hybrid windmill stations are determined based upon the wind histories of the area where the stations are to be located, and the demand characteristics of the area where the energy from the stations are to be used.

10. The method of claim 9, wherein other design considerations are taken into account, including the size of said at least one tank, the capacity of the compressor, the capacity of the expander, the total number of windmill stations to be installed, the availability of an auxiliary burner as a back-up energy supply, and the availability of one or more heating devices to heat the compressed air to be released and expanded.

11. The method of claim 8, wherein the predetermined numbers of said first, second and hybrid windmill stations are determined based on a ratio of about 65 percent immediate use windmill stations and 35 percent energy storage windmill stations.

12. The method of claim 8, wherein the design takes into account daily wind and energy demand histories for a given location, which are obtained for predetermined periods of the year.

13. The method of claim 12, wherein an estimate is made, based on the daily histories, of the total number of said first and second windmill stations to install, based on the worst mismatched predetermined periods.

14. The method of claim 13, wherein an iterative process is used to determine a system which can provide energy to said given location on an uninterrupted and continuous basis, in a cost-effective and energy-efficient way.

15. The method of claim 12, wherein the predetermined periods of the year are seasons.

16. A wind farm for generating and storing energy, comprising:

a plurality of windmill stations located in a predetermined area, wherein said plurality of windmill stations is divided into at least three types;

a predetermined number of first windmill stations having a first wind turbine and an electrical generator adapted and dedicated to converting wind energy into electrical energy for immediate use;

a predetermined number of second windmill stations having a second wind turbine adapted and dedicated to storing energy produced by the wind in at least one storage tank, wherein said at least one storage tank has associated therewith at least one compressor to compress air into said at least one tank, at least one expander to release the compressed air from said at least one tank, and a second generator to convert compressed air energy into electrical energy; and

a predetermined number of hybrid windmill stations having a third wind turbine adapted and dedicated to converting wind energy into electrical energy for immediate use, and/or storing energy produced by the wind, wherein said hybrid windmill stations each comprise a splitter for splitting mechanical power generated by said third wind turbine, wherein said splitter is capable of simultaneously apportioning and adjusting the amount of mechanical power generated by said third wind turbine between a first converter for generating electricity for immediate use, and a second converter for generating and storing compressed air energy in at least one storage tank.

17. The wind farm of claim 16, wherein at least one heating device is provided to heat the compressed air that is released and expanded, and wherein said at least one heating device is taken from the group consisting of the following:

a. a device which derives heat from solar energy;

b. a device or mass which derives heat from said at least one compressor;

c. a heating device which uses its own energy source;

d. a heat exchanger having tubes extending through said tank, wherein a heated fluid can be passed through said tubes to increase the temperature of the air inside said tank.

18. The wind farm of claim 16, wherein the predetermined number of said first windmill stations, the predetermined number of said second windmill stations, and the predetermined number of said hybrid windmill stations are based on the wind characteristics of the area where the stations are located and the use characteristics of the area where the energy from the system is used.

19. The wind farm of claim 16, wherein a refrigerating device is operatively connected to said at least one tank to enable the cold temperatures generated by said compressed air being released and expanded to be used for refrigeration purposes.