METHOD AND DEVICES FOR STABILIZING ELECTRIC GRID POWER

• US 20100177450A1
• Filed: 01/12/2010
• Published: 07/15/2010
• Est. Priority Date: 01/12/2009
• Status: Abandoned Application

• Current Assignee: Grid Logic Incorporated
• Original Assignee: Grid Logic Incorporated
• Inventors: Caravias, George, Holcomb, Matthew J.
• Application Number:
  US12/686,258
• Publication Number:
  US 20100177450A1
• Time in Patent Office: Days
• US Class Current: 361/19
• CPC Class Codes: H02H 9/023 Current limitation using superconducting elements
• CPC Class Codes: Y02E 40/60 Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

The invention provides an electric grid stabilization metadevice including a plurality of interactive grid devices each forming part of a respective electrical path of an electric grid and each including, a variable impedance device that inserts a current limiting impedance in the respective path when a fault occurs, a state detection transducer connected to the variable impedance device to change a detection state when the fault occurs and an integral communications system having transmission and reception capabilities and being connected to the state detection transducer and variable impedance device, wherein a fault detected by each of the interactive grid devices automatically causes transmission of a signal to another integrated grid device, reception of the signal by the other integrated grid device and an insertion of a current limiting impedance by the other integrated grid device.

Claims

1. An electric grid stabilization metadevice comprising:

a plurality of interactive grid devices each forming part of a respective electrical path of an electric grid and each including;

a variable impedance device that inserts a current limiting impedance in the respective path when a fault occurs;

a state detection transducer connected to the variable impedance device to change a detection state when the fault occurs; and

an integral communications system having transmission and reception capabilities and being connected to the state detection transducer and variable impedance device, wherein a fault detected by each of the interactive grid devices automatically causes transmission of a signal to another integrated grid device, reception of the signal by the other integrated grid device and an insertion of a current limiting impedance by the other integrated grid device.

2. The electric grid stabilization metadevice of claim 1, wherein a fault detected by a first of the integrated grid devices causes automatic transmission of a signal to a second of the integrated grid devices and an insertion of a current limiting impedance by the second integrated grid device.

3. The electric grid stabilization metadevice of claim 2, wherein a fault detected by the second integrated grid device causes automatic transmission of a signal to the first integrated grid device and an insertion of a current limiting impedance by the first integrated grid device.

4. The electric grid stabilization metadevice of claim 3, wherein a fault detected by the second integrated grid device causes automatic transmission of a signal to a third of the integrated grid devices and an insertion of a current limiting impedance by the third integrated grid device.

5. The electric grid stabilization metadevice of claim 4, wherein the fault detected by the first of the integrated grid devices causes the insertion of the current limiting impedance by the second integrated grid device without causing the insertion of the current limiting impedance by the third integrated grid device.

6. The electric grid stabilization metadevice of claim 5, wherein the second integrated grid device is nearer to the first integrated grid device than the third integrated grid device.

7. The electric grid stabilization metadevice of claim 5, wherein there is a time delay between the insertion of the current limiting impedance by the second integrated grid device and the insertion of the current limiting impedance by the third integrated grid device.

8. The electric grid stabilization metadevice of claim 2, wherein a fault detected by the second integrated grid device causes automatic transmission of a signal to a third of the integrated grid devices and an insertion of current limiting impedance by the third integrated grid device.

9. The electric grid stabilization metadevice of claim 8, wherein a fault detected by the first integrated grid device causes automatic transmission of a signal to the third integrated grid device and an insertion of a current limiting impedance by the third integrated grid device.

10. The electric grid stabilization metadevice of claim 9, wherein a fault detected by the third integrated grid device causes automatic transmission of a signal to the second integrated grid device and an insertion of a current limiting impedance by the second integrated grid device.

11. The electric grid stabilization metadevice of claim 9, wherein a fault detected by the third integrated grid device causes automatic transmission of a signal to the first integrated grid device and an insertion of a current limiting impedance by the first integrated grid device.

12. The electric grid stabilization metadevice of claim 1, wherein the current limiting impedance allows current to flow through the respective path.

13. The electric grid stabilization metadevice of claim 12, wherein the variable impedance device includes a superconductor branch and a finite impedance shunt branch in parallel, current passing through the superconductor branch if the current is below a critical current of the superconductor branch, and the current through the superconductor branch being reduced by the superconductor branch if the current exceeds the critical current, and increased in the finite impedance shunt branch, to increase an impedance of the superconductor branch and the finite impedance shunt branch in parallel.

14. The electric grid stabilization metadevice of claim 13, further comprising:

an element that is operable to couple and decouple from superconductor material of the superconductor branch, a change in coupling causing a change in resistance of the superconductor branch, the element being connected to the integral communications system so that the integral communications system operates the element in response to reception of the signal.

15. The electric grid stabilization metadevice of claim 14, wherein the element is a solenoid element that creates a magnetic field in the superconductor branch when energized.

16. The electric grid stabilization metadevice of claim 13, wherein the state detection transducer is a thermocouple that detects temperature of the superconductor branch.

17. A method of stabilizing electric power, comprising:

detecting a fault in a grid using a first variable impedance device;

inserting a current limiting impedance in a first path of the grid using the first variable impedance device nearest to the fault;

transmitting a signal from the first variable impedance device to a second variable impedance device following detection of the fault;

receiving the signal at the second variable impedance device; and

inserting a current limiting impedance in a second path of the grid using the second variable impedance device in response to receiving the signal.

18. An interactive grid device comprising:

first and second terminals;

a superconductor component electrically connecting the first and second terminals;

a cooling system, the superconductor component being connected to the cooling system to be cooled to below a critical temperature of superconductor material of the superconductor component to allow for superconducting current to flow through the superconductor component, a fault causing decrease in the superconducting current;

a state detection transducer positioned to change a detection state when the fault occurs; and

an integral communications system connected to the state detection transducer, the integral communications system generating and transmitting a signal when the fault occurs.

19. The method of claim 18, wherein the state detection transducer is a thermocouple that detects temperature of the superconductor branch.

20. The method of claim 18, wherein the variable impedance device includes a superconductor branch and a finite impedance shunt branch in parallel, current passing through the superconductor branch if the current is below a critical current of the superconductor branch, and the current through the superconductor branch being reduced by the superconductor branch if the current exceeds the critical current and increased in the finite impedance shunt branch, to increase an impedance of the superconductor branch and the finite impedance shunt branch in parallel.

21. The method of claim 18, further comprising:

an element that is operable to couple and decouple from superconductor material of the superconductor branch, a change in coupling causing a change in resistance of the superconductor branch, the element being connected to the integral communications system so that the integral communications system operates the element in response to reception of the signal.

22. The method of claim 18, wherein the element is a solenoid element that creates a magnetic field in the superconductor branch when energized.