Voltage selection control scheme for synchronism check in digital substations
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorsYusuf Zafer Korkmaz, Sagar Dayabhai
Life of this patent
Estimating the term…
Abstract
A system for voltage signal distribution in a digital substation protection system. In a system where a voltage signal from a bus is not available, an alternative voltage secondary signal may be selected as a reference voltage and made available to the appropriate protection devices in a digital substation protection system for synchronism check. Voltage signals may be distributed using software-defined networking. A voltage selection controller may select the reference voltage and control distribution of the voltage signal using the software-defined networking communication system.
Claims20
A system for use in an electric power system, the system comprising:
- a communication interface configured to receive a plurality of data streams over time and comprising:
- a first data stream comprising a plurality of voltage measurements associated with a plurality of locations within an electric power system;
- a second data stream comprising a plurality of status indicators associated with a plurality of devices configured to selectively connect and disconnect portions of the electric power system;
- a topology subsystem configured to determine a topology of the electric power system based on the plurality of status indicators;
- a dynamic reference voltage selection subsystem configured to identify:
- a first subset of the plurality of voltage measurements associated with a first portion of the electric power system;
- a second subset of the plurality of voltage measurements of a second portion of the electric power system, the first portion of the electric power system and the second portion of the electric power system being electrically disconnected;
- and
- a protection device associated with the second portion of the electric power system;
- and
- a routing subsystem configured to dynamically route the first subset of the plurality of voltage measurements to the protection device associated with the second portion of the electric power system.
A method for use in an electric power system, the method comprising:
- receiving, using a communication interface, a plurality of data streams over time and comprising:
- a first data stream comprising a plurality of voltage measurements associated with a plurality of locations within an electric power system;
- a second data stream comprising a plurality of status indicators associated with a plurality of devices configured to selectively connect and disconnect portions of the electric power system;
- determining, using a topology subsystem, a topology of the electric power system based on the plurality of status indicators;
- identifying, using a dynamic reference voltage selection subsystem:
- a first subset of the plurality of voltage measurements associated with a first portion of the electric power system;
- a second subset of the plurality of voltage measurements of a second portion of the electric power system, the first portion of the electric power system and the second portion of the electric power system being electrically disconnected;
- and
- a protection device associated with the second portion of the electric power system;
- and
- dynamically routing, using a routing subsystem, the first subset of the plurality of voltage measurements to the protection device associated with the second portion of the electric power system.
A system for substation protection in an electric power system, comprising:
- a first bus;
- a plurality of feeders in electrical communication with the first bus;
- a plurality of voltage transformers in electrical communication with a respective feeder;
- a plurality of merging units in electrical communication with a respective voltage transformer;
- a protection device configured to receive signals from the plurality of merging units;
- and
- a programmable communications network in communication with the plurality of merging units and the protection device, the programmable communications network comprising:
- a communications network controller;
- a logic controller configured to dynamically select a voltage signal from one of the plurality of merging units as a reference voltage;
- and
- a plurality of programmable switches in communication with the communications network controller configured to provide a first dynamically selected reference voltage associated with the first bus to a first protection device.
Dependencies are inferred from the claim text.