Online protection coordination for distribution management system
First Claim
1. A method for automatic protection coordination in a power system network that includes one or more power sources and multiple fault protection devices, wherein a plurality of the fault protection devices are remotely controllable and have multiple preconfigured settings, the method comprising:
- identifying radial source-to-load paths and fault protection devices in said source-to-load paths, for a portion of the power system network to be coordinated, based on stored topology data for said portion;
retrieving protection device settings data for identified fault protection devices, including the multiple preconfigured settings for remotely controllable fault protection devices in said portion of the power system network;
calculating predicted fault currents for each of a plurality of possible electrical faults in said portion of the power system network, based on the stored topology data;
performing a selectivity check for each pair of fault protection devices that are adjacent to one another in an identified radial source-to-load path, for each of one or more of the predicted fault currents, taking into account multiple preconfigured settings for remotely controllable fault protection devices;
selecting a combination of settings for remotely controllable fault protection devices, based on the selectivity check, to minimize selectivity violations among the pairs;
sending a change-setting command to remotely controllable fault protection devices for which settings have changed, based on the selected combination of settings.
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Accused Products
Abstract
A method for automatic protection coordination in a power system network comprises identifying radial source-to-load paths and fault protection devices in the source-to-load paths, for a portion of the power system network to be coordinated. Device settings data for fault protection devices are retrieved, including multiple preconfigured settings for some devices. Fault currents for each of multiple possible electrical faults in said portion of the power system network are predicted, and a selectivity check for each pair of fault protection devices that are adjacent to one another in an identified radial source-to-load path is performed, for each of one or more of the predicted fault currents, taking into account multiple preconfigured settings for remotely controllable fault protection devices. A combination of settings for remotely controllable fault protection devices that minimizes selectivity violations among the pairs is selected, and necessary change-setting commands are sent to remotely controllable fault protection devices.
44 Citations
25 Claims
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1. A method for automatic protection coordination in a power system network that includes one or more power sources and multiple fault protection devices, wherein a plurality of the fault protection devices are remotely controllable and have multiple preconfigured settings, the method comprising:
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identifying radial source-to-load paths and fault protection devices in said source-to-load paths, for a portion of the power system network to be coordinated, based on stored topology data for said portion; retrieving protection device settings data for identified fault protection devices, including the multiple preconfigured settings for remotely controllable fault protection devices in said portion of the power system network; calculating predicted fault currents for each of a plurality of possible electrical faults in said portion of the power system network, based on the stored topology data; performing a selectivity check for each pair of fault protection devices that are adjacent to one another in an identified radial source-to-load path, for each of one or more of the predicted fault currents, taking into account multiple preconfigured settings for remotely controllable fault protection devices; selecting a combination of settings for remotely controllable fault protection devices, based on the selectivity check, to minimize selectivity violations among the pairs; sending a change-setting command to remotely controllable fault protection devices for which settings have changed, based on the selected combination of settings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 23, 24)
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14. A computerized automatic protection coordination system for use in a power system network that includes one or more power sources and multiple fault protection devices, wherein a plurality of the fault protection devices are remotely controllable and have multiple preconfigured settings, the system including:
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a network topology analysis module configured to identify radial source-to-load paths and fault protection devices in said source-to-load paths, for a portion of the power system network to be coordinated, based on stored topology data for said portion; a fault analysis module configured to calculate predicted fault currents for each of a plurality of possible electrical faults in said portion of the power system network, based on the stored topology data; a selectivity analysis module configured to retrieve protection device settings data for each of the identified fault protection devices, including the multiple preconfigured settings for remotely controllable fault protection devices in said portion of the power system network, perform a selectivity check for each pair of fault protection devices that are adjacent to one another in an identified radial source-to-load path, for each of one or more of the predicted fault currents, taking into account the multiple preconfigured settings for remotely controllable fault protection devices, and select a combination of settings for the remotely controllable fault protection devices, based on the selectivity check, to minimize selectivity violations among the pairs; and a communications module configured to send a change-setting command to remotely controllable fault protection devices for which settings have changed, based on the selected combination of settings. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 25)
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Specification