POWER SYSTEM

• US 20120286524A1
• Filed: 05/17/2012
• Published: 11/15/2012
• Est. Priority Date: 11/19/2009
• Status: Active Grant

• Current Assignee: Ormat Technologies Incorporated (Ormat Industries Limited)
• Original Assignee: Ormat Technologies Incorporated (Ormat Industries Limited)
• Inventors: Bronicki, Lucien Y.
• Granted Patent: US 9,115,604 B2
• Time in Patent Office: Days
• US Class Current: 290/40.B
• CPC Class Codes: F01K 13/02 Controlling, e.g. stopping or starting
• CPC Class Codes: F01K 25/10 the vapours being cold, e.g. ammonia, carbon dioxide, ether
• CPC Class Codes: H02P 9/04 Control effected upon non-electric prime mover and dependent upon electric output value of the generator
• CPC Class Codes: H02P 9/102 for limiting effects of transients

Abstract

A power system includes a Rankine cycle local generator having a capacity greater than a maximum anticipated power level. One or more control devices are operatively connected to the local generator for regulating active and reactive power generated by the generator. Detectors are provided to sense active and reactive voltages. The controller directs the control devices to regulate the generator such that the active power and reactive power are sufficient to satisfy the active and reactive load conditions.

Claims

1. A power system for delivering a custom level of electrical power to an industrial or commercial facility, comprising a local generator connected to a turbine operating in accordance with an organic Rankine or steam Rankine cycle, said local generator having a capacity at least greater than a maximum anticipated power level needed for the electrical needs of a local industrial or commercial facility, one or more control devices operatively connected to said local generator for regulating active and reactive power generated by said generator, a detector for sensing active voltage produced by said generator, a detector for sensing reactive voltage produced by said generator, and a controller in electrical communication with said one or more control devices and with said active and reactive voltage detectors, wherein said controller directs said one or more control devices to regulate said generator such that the active power and reactive power generated by said generator are sufficient to satisfy active and reactive load conditions, respectively, of said local industrial or commercial facility.

2. The power system according to claim 1, wherein the active power and reactive power generated by the local generator sufficiently supplement the active power and reactive power, respectively, supplied by an electric network to satisfy the load conditions of the local industrial or commercial facility.

3. The power system according to claim 1, wherein the controller is further in communication with an active power sensor and with a reactive power sensor for detecting an instantaneous accumulative electrical load imposed by the local industrial or commercial facility at a gate region, the controller directing one or more control devices in response to sensed values received from said active and reactive power sensors to regulate said generator such that the active power and reactive power generated by the generator are sufficient to satisfy active and reactive load conditions, respectively, of the local industrial or commercial facility.

4. The power system according to claim 1 wherein said organic Rankine cycle utilizes an organic motive fluid selected from the group propane, butane, pentane, or hexane as its motive fluid.

5. The power system according to claim 4, wherein the controller is further in communication with a flow controlling component of the thermodynamic cycle, said flow control component adapted to limit the flow of motive fluid to the turbine during base load conditions.

6. The power system according to claim 1, wherein the one or more control devices are selected from the group of voltage controller, reactive voltage ampere controller, power factor controller, rotor speed controller, and frequency controller, or a combination thereof.

7. The power system according to claim 1, wherein a surplus amount of active power and reactive power generated by the generator and not needed by the industrial or commercial facility is supplied to an electric network or grid.

8. The power system according to claim 1, wherein a surplus amount of active power and reactive power generated by the generator and not needed by the local industrial or commercial facility is supplied to a remote industrial or commercial facility.

9. The power system according to claim 8, wherein the controller is in data communication with a controller of the remote industrial or commercial facility, the surplus amount of active power and reactive power being supplied to the remote industrial or commercial facility following transmission of a request signal from the controller of the remote industrial or commercial facility to the controller of the local industrial or commercial facility.

10. A power system for providing a fast acting spinning reserve, comprising a turbine module operating in accordance with an organic Rankine cycle or steam power cycle coupled to a generator, a main conduit through which motive fluid vapor heated in said organic Rankine cycle is supplied to said turbine module, and a flow control component operatively connected to said main conduit for automatically limiting the flow of the motive fluid vapor to said turbine module during base load conditions and for automatically increasing the flow of the motive fluid vapor to said turbine module during variable load conditions.

11. The power system according to claim 10, wherein the motive fluid is heated by means of a main heat exchanger through which high temperature fluid flows.

12. The power system according to claim 11, wherein the high temperature fluid is selected from the group of waste heat gases, geothermal fluid and heat storage fluid.

13. The power system according to claim 10 wherein said organic Rankine cycle utilizes an organic motive fluid selected from the group propane, butane, pentane, or hexane as its motive fluid.

14. The power system according to claim 10, wherein the flow control component is a bypass valve for diverting a portion of the heated motive fluid to a second conduit.

15. The power system according to claim 14, wherein the diverted motive fluid flows via the second conduit to a secondary heat exchanger wherein fluid used in industrial process heat is heated.

16. The power system according to claim 14, wherein the diverted motive fluid flows via the second conduit to a condenser of the organic Rankine cycle.

17. The power system according to claim 10, further comprising a controller in communication with the flow control component and with a control component of the generator, said controller adapted to regulate the generator such that active power and reactive power generated by the generator are sufficient to satisfy active and reactive load conditions, respectively, of an industrial or commercial facility.