Adaptive provision of protection function settings of electrical machines

• US 7,684,900 B2
• Filed: 02/20/2007
• Issued: 03/23/2010
• Est. Priority Date: 02/20/2007
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited (Hitachi, Ltd.)
• Original Assignee: ABB Research Ltd. (ABB Limited)
• Inventors: Thorburn, Stefan, Haj-Maharsi, Mohamed Y., Scholtz, Ernst
• Primary Examiner(s): Bahta; Kidest
• Application Number:
  US11/676,769
• Publication Number:
  US 20080201020A1
• Time in Patent Office: 1,127 Days
• Field of Search: 700/286, 700/292, 700/291, 340/638, 340/635, 361/89, 361/85, 361/65, 318801-802, 318/808
• US Class Current: 700/286
• CPC Class Codes: H02H 3/006 Calibration or setting of parameters
• CPC Class Codes: H02H 7/06 for dynamo-electric generators; for synchronous capacitors
• CPC Class Codes: H02P 9/006 Means for protecting the generator by using control control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10

Abstract

A protection setting determiner (118) adaptively updates settings of protection functions in memory of a protection device (106) that protects a machine (102) that provides power to a power system (104), wherein the settings are updated based at least in part upon sensed data acquired during operation of the machine (102). A physical parameter determiner (110) receives the sensed data, which includes three-phase voltage and three-phase current values at the terminals of the machine (102), and uses any suitable real-time or off-line parameter estimation technique (such as Kalman Filtering for an augmented state) to determine physical parameters of the machine (102) and the power system (104). The protection setting determiner (118) uses the physical parameters to update the protection settings.

Claims

1. A computer-implemented method, which, when executed by a computer, causes a processor of the computer to perform the following computer-executable acts:

acquiring data indicative of operating conditions of a generator that is protected by a protection device, wherein the protection device includes one or more protection functions;

iteratively providing settings for the one or more protection functions to the protection device based at least in part upon physical parameters of the generator that are determined based at least in part upon the acquired data; and

protecting, via the protection device, the generator using the one or more protection functions with the iteratively provided settings.

2. The method of claim 1, further comprising:

using parameter estimation techniques to determine at least one of inertia of the generator, shaft damping coefficient of the generator, or time-varying mechanical power input into the generator based at least in part upon the acquired data; and

determining the physical parameters based at least in part upon the at least one of inertia of the generator, shaft damping coefficient of the generator, or time varying mechanical power input into the generator.

3. The method of claim 1, wherein the physical parameters of the generator include at least one of transient reactance of the generator, reactance of a step-up transformer electrically coupled to the generator, synchronous reactance of the electrical device, or sub-transient reactance of the generator.

4. The method of claim 1, further comprising performing a statistical analysis on the determined physical parameters, wherein the statistical analysis is based at least in part upon one or more of operator experience, workshop data, or physical parameters for a type of equipment reported in literature.

5. The method of claim 1, further comprising presenting the determined physical parameters to an operator for approval prior to providing the determined physical parameters to the protection device.

6. The method of claim 1, further comprising initially providing settings for the one or more protection functions.

7. The method of claim 6, wherein initially providing the settings comprises at least one of receiving operator input with respect to the physical parameters or acquiring workshop data.

8. The method of claim 1, wherein the data is acquired upon the generator experiencing a fault.

9. The method of claim 1, wherein the protection device is a protection relay.

10. The method of claim 1, wherein the acquired data includes three-phase voltages and three-phase currents at the terminals of the generator, and further wherein the physical parameters are determined as a function of the three-phase voltages and the three-phase currents.

11. The method of claim 1, wherein the physical parameters are determined through use of a combination of Least Squares techniques and Kalman Filters with respect to the acquired data.

12. An apparatus, comprising:

at least one processor that repeatedly estimates physical parameters of a generator that provides power to a power system and that configures settings for one or more protection functions in a protection device that protects the generator, wherein the settings of the protection functions are based at least in part upon the estimated physical parameters, and the protection device employs the one or more protection functions, using the processor configured settings, to protect the generator.

13. The apparatus of claim 12 being the protection device.

14. The apparatus of claim 12, wherein the protection device is a protection relay.

15. The apparatus of claim 12, further comprising a parameter checker that performs a statistical analysis on estimated physical parameters.

16. The apparatus of claim 12, further comprising a human-machine interface that presents the physical parameters to an operator and receives operator instructions to update settings of protection functions in memory of the protection device through use of the estimated physical parameters.

17. The apparatus of claim 12, wherein the processor initially provides settings for the protection functions to the protection device by acquiring one or more of instructions from an operator, workshop data, operational data, or literature sources from a data repository.

18. The apparatus of claim 12, wherein the physical parameters include at least one of transient reactance of the generator, reactance of a step-up transformer electrically coupled to the generator, or synchronous reactance of the generator.

19. The apparatus of claim 12, further comprising sensors that acquire three phase voltage and three phase current values with respect to terminals of the machine, wherein the three phase voltage and three phase current values are used by the processor to estimate the physical parameters.

20. The apparatus of claim 12, wherein the processor estimates the physical parameters while the generator is online.

21. A method, comprising:

acquiring, via a processor, data indicative of operating conditions of a generator, wherein the generator provides power to a power system, and the generator is protected by a protection device that includes one or more protection functions;

iteratively both determining, via the processor, settings for the one or more protection functions of the protection device and providing, via the processor, the determined settings to the protection device, wherein the settings are determined based at least in part upon physical parameters of the generator that are determined based at least in part upon the acquired data; and

using, via the protection device, the iteratively provided settings with the one or more protection functions to protect the generator.

22. The method of claim 21, further comprising:

using parameter estimation techniques to determine at least one of inertia of the generator, shaft damping coefficient of the generator, or time-varying mechanical power input into the generator based at least in part upon the acquired data; and

determining the physical parameters based at least in part upon the at least one of inertia of the generator, shaft damping coefficient of the generator, or time varying mechanical power input into the generator, wherein the physical parameters of the generator include at least one of transient reactance of the generator, reactance of a step-up transformer electrically coupled to the generator, synchronous reactance of the generator, or sub-transient reactance of the generator.

23. The method of claim 22, further comprising presenting the determined physical parameters to an operator for approval prior to providing the determined physical parameters to the protection device.