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US 2021/0278447 A1Published application
Electric power system voltage monitoring and control with energy packets
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorsEdmund O. Schweitzer, III, Gregary C. Zweigle, Ellery A. Blood
Life of this patent
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Abstract
Electric power system voltage control and voltage stability may be calculated using energy packets. Sets of negative energy packet sets normalized by a set of positive and negative energy packet sets may be used for voltage control by adding or removing capacitive units. Energy packet voltage indicators may be calculated using energy packets, and used to determine voltage stability. Control actions may be taken depending on the determined voltage stability.
Claims16
A device for electric power system voltage control, comprising:
- an interface for receiving electric power delivery system signals at a first point and a second point separate from the first point, providing current and voltage measurements from the first point and the second point;
- an energy packet calculator in communication with the stimulus interface to:
- calculate source energy packets over predetermined time interval lengths passing through the first point;
- calculate received energy packets over the predetermined time interval lengths passing through the second point;
- calculate a ratio of the source energy packets and received energy packets;
- and,
- a voltage controller in communication with the energy packet calculator to:
- compare the ratio and a derivative of the ratio with a threshold;
- and,
- when the ratio and the derivative of the ratio exceed the threshold, initiate a control action.
7 more elements
A system for electric power system voltage stability, comprising:
- stimulus interfaces for receiving electric power delivery system signals at a local point and a remote point, providing current and voltage measurements;
- an energy packet calculator in communication with the stimulus interfaces to calculate energy packets over predetermined time interval lengths passing through the local and remote points by:
- calculating products of the current measurements and the voltage measurements obtained over a time interval of the predetermined time interval length;
- calculating a time interval power as a sum of the calculated products of the current and voltage measurements over the time interval;
- calculating source energy packet values for the time interval as a numerical integration of the product of instantaneous voltage and current measurements at the local point over that time interval;
- calculating received energy packet values for the time interval as a numerical integration of the product of instantaneous voltage and current measurements at the remote point over that time interval;
- and,
- calculating a ratio of the source energy packets and the received energy packets and,
- a voltage stability controller in communication with the energy packet calculator to:
- compare the ratio of the source energy packets and a derivative of the ratio of the source energy packets to a threshold;
- and,
- when the ratio and the derivative of the ratio exceed the threshold, initiate a control action.
9 more elements
A method for electric power system voltage control, comprising:
- obtaining electric power delivery system signals at a first point and a second point separate from the first point;
- calculating current and voltage measurements from the signals;
- calculating source energy packets over predetermined time interval lengths passing through the first point and calculating received energy packets over the predetermined time interval length passing through the second point by:
- calculating products of the current measurements and the voltage measurements obtained over a time interval of the predetermined time interval length;
- calculating a time interval power as a sum of the calculated products of the current and voltage measurements over the time interval;
- calculating an energy packet value for the time interval as a numerical integration of the product of instantaneous voltage and current measurements over that time interval;
- and,
- calculating a ratio of the source energy packets and the received energy packets;
- and
- controlling a voltage of the electric power system by:
- comparing the ratio and a derivative of the ratio with a threshold;
- and
- when the ratio and the derivative of the ratio exceed the threshold, initiating a control action.
10 more elements
Dependencies are inferred from the claim text.