Wide-area measurement system based control of grid-scale storage for power system stability enhancement

Patent metadata

Field	Value
Publication number	US-9964572-B2
Application number	US-201615019610-A
Country	US
Kind code	B2
Filing date	Feb 9, 2016
Priority date	Feb 12, 2015
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A method and system are provided. The method includes collecting, from a plurality of phasor measurement units, a plurality of synchronized phasor measurements from different portions of a power system. The method further includes estimating, by a controller, oscillation modes of the plurality of synchronized phasor measurements. Each estimated oscillation mode specifies, for each of the plurality of synchronized phasor measurements, two or more of an amplitude, a phase, a frequency, and damping coefficients. The method also includes performing, by the controller, a modal analysis of the oscillation modes of the plurality of synchronized phasor measurements to identify critical modes based on critical mode identifying criteria. The method additionally includes constructing, by the controller based on the critical modes, a power system oscillation dampening control signal for controlling a grid-scale storage portion of the power system to dampen one or more oscillations of the power system at any given time.

First claim

What is claimed is:

1. A method, comprising:
collecting, from a plurality of phasor measurement units by a wide-area measurement system, a plurality of synchronized phasor measurements from different portions of a power system;
estimating, by a hardware-based controller, oscillation modes of the plurality of synchronized phasor measurements, each of the estimated oscillation modes specifying, for each of the plurality of synchronized phasor measurements, two or more of an amplitude, a phase, a frequency, and damping coefficients;
performing, by the hardware-based controller, a modal analysis of the oscillation modes of the plurality of synchronized phasor measurements to identify critical modes based on critical mode identifying criteria;
constructing, by the hardware-based controller based on the critical modes, a power system oscillation damping control signal for controlling a grid-scale storage portion of the power system to damp one or more oscillations of the power system at any given time; and
controlling the grid-scale storage portion of the power system to respectively charge and discharge at opposing phases with respect to a given one of the one or more oscillations to mitigate the given one of the one or more oscillations.

2. The method of claim 1 , wherein the critical mode identifying criteria comprises oscillation modes having at least one of (i) an amplitude above a threshold amplitude and (ii) at least one damping coefficient below a damping coefficient threshold.

3. The method of claim 1 , wherein the oscillation modes of the plurality of synchronized phasor measurements are estimating using a Prony analysis applied to the plurality of synchronized phasor measurements.

4. The method of claim 1 , wherein the oscillation modes of the plurality of synchronized phasor measurements are estimated using a wavelet-based oscillation identification process applied to the plurality of synchronized phasor measurements.

5. The method of claim 1 , wherein the oscillation modes of the plurality of synchronized phasor measurements are estimated using signal time domain modeling, linear prediction modeling, and polynomial root identification.

6. The method of claim 1 , further comprising controlling one or more operations of the grid-scale storage portion of the power system responsive to the power system oscillation damping control signal.

7. The method of claim 6 , wherein the one or more operations include a charging operation and a discharging operation of a power storage element of the grid-scale storage portion.

8. The method of claim 1 , wherein the grid-scale storage portion is controlled to charge at a negative peak of the given one of the one or more oscillations and discharge at a positive peak of the given one of the one or more oscillations.

9. The method of claim 1 , wherein the power system oscillation damping control signal is constructed as a reference control signal having an opposite phase of the critical modes and proportional in magnitude to a summarization of the critical modes.

10. The method of claim 1 , forming a wide-area measurement system based adaptive closed-loop control system for the grid-scale storage portion that damps the one or more oscillations of the power system based on the power system oscillation damping control signal.

11. The method of claim 1 , wherein at least one of the one or more oscillations that is damped responsive to the power system oscillation damping control signal is an inter-area oscillation.

12. The method of claim 1 , wherein the one or more oscillations comprise at least two oscillations, and wherein the power system oscillation damping control signal controls the grid-scale storage portion to simultaneously damp the at least two oscillations.

13. The method of claim 1 , wherein the power system oscillation damping control signal is constructed by phase compensating a respective communication delay for each of the critical modes to output a respective sinusoid therefor, and applying a summarization process to the respective sinusoid for each of the critical modes to obtain a summarized signal as the power system oscillation damping control signal.

14. A non-transitory article of manufacture tangibly embodying a computer readable program which when executed causes a computer to perform the steps of claim 1 .

15. A power oscillation control system for a power system, comprising:
a hardware-based controller having a signal generator, the hardware-based controller configured to:
receive a plurality of synchronized phasor measurements obtained from different portions of a power system by a plurality of phasor measurement units through a wide-area measurement system;
estimate oscillation modes of the plurality of synchronized phasor measurements, each of the estimated oscillation modes specifying, for each of the plurality of synchronized phasor measurements, two or more of an amplitude, a phase, a frequency, and damping coefficients;
perform a modal analysis of the oscillation modes of the plurality of synchronized phasor measurements to identify critical modes based on critical mode identifying criteria;
construct, based on the critical modes, a power system oscillation damping control signal for controlling a grid-scale storage portion of the power system to damp one or more oscillations of the power system at any given time; and
control the grid-scale storage portion of the power system to respectively charge and discharge at opposing phases with respect to a given one of the one or more oscillations to mitigate the given one of the one or more oscillations.

16. The power oscillation control system for a power system of claim 15 , wherein the oscillation modes of the plurality of synchronized phasor measurements are estimating using a Prony analysis applied to the plurality of synchronized phasor measurements.

17. The power oscillation control system for a power system of claim 15 , wherein the power system oscillation damping control signal is constructed as a reference control signal having an opposite phase of the critical modes and proportional in magnitude to a summarization of the critical modes.

18. The power oscillation control system for a power system of claim 15 , wherein the one or more oscillations comprise at least two oscillations, and wherein the power system oscillation damping control signal controls the grid-scale storage portion to simultaneously damp the at least two oscillations.

19. The power oscillation control system for a power system of claim 15 , wherein the power system oscillation damping control signal is constructed by phase compensating a respective communication delay for each of the critical modes to output a respective sinusoid therefor, and applying a summarization process to the respective sinusoid for each of the critical modes to obtain a summarized signal as the power system oscillation damping control signal.

Assignees

• Nec Lab America Inc
• Nec Corp

Inventors

• Shi Di
• Sharma Ratnesh
• Guo Feng

Classifications

• Y04S10/14

  Energy storage units · CPC title

• Y04S40/12

  characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment · CPC title

• G01R19/2513

  Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging · CPC title

• G01R23/00

  Arrangements for measuring frequencies; Arrangements for analysing frequency spectra · CPC title

• H02J13/13 Primary

  characterised by the transmission of data to equipment in the power network · CPC title