Emergency frequency load shedding scheme

• US 8,204,632 B2
• Filed: 06/03/2008
• Issued: 06/19/2012
• Est. Priority Date: 06/03/2008
• Status: Active Grant

• Current Assignee: Electric Power Research Institute Incorporated
• Original Assignee: Electric Power Research Institute Incorporated
• Inventors: Abi-Samra, Nicholas C.
• Primary Examiner(s): Decady, Albert
• Assistant Examiner(s): Lin, Jason
• Application Number:
  US12/131,986
• Publication Number:
  US 20090299540A1
• Time in Patent Office: 1,477 Days
• Field of Search: 700/295, 700/286, 307/34, 307/32, 307 38- 39, 702/75
• US Class Current: 700/295
• CPC Class Codes: H02J 2310/60 Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

A load shedding system and method for controlling imbalances in a power system includes a signal generator adapted to generate a signal representative of a local system, and a modifying circuit adapted to adjust set frequencies. The system also includes a processing circuit adapted to process data received from the signal generator and modifying circuit and set load shedding priorities for the local system based on the processed data.

Claims

1. A load shedding system, comprising:

(a) a signal generator adapted to generate a signal equal to a local system frequency;

(b) a modifying circuit adapted to adjust a predetermined frequency based on a rate of change of the local system frequency and thereby generate an adjusted frequency; and

(c) a processing circuit adapted to;

(i) compare the adjusted frequency to the predetermined frequency; and

(ii) set load shedding priorities for the local system based on the comparison of the adjusted frequency to the predetermined frequency.

2. The load shedding system according to claim 1, wherein the signal generator provides localized readings of frequency and power carried by the local system.

3. The load shedding system according to claim 1, wherein the signal generator generates a signal equal to a frequency measured at the local system.

4. The load shedding system according to claim 1, wherein the signal generator generates a signal equivalent to a power carried and measured at the local system.

5. The load shedding system according to claim 1, wherein the processing circuit includes a processor for setting the load shedding priorities.

6. The load shedding system according to claim 1, wherein the processing circuit compares data from the signal generator and the modifying circuit to predetermined frequencies.

7. The load shedding system according to claim 1, wherein the signal generator provides localized readings of frequency and power carried by feeders of the local system.