Device and method for automatically coordinating protection device of smart power distribution management system

Patent metadata

Field	Value
Publication number	US-9594389-B2
Application number	US-201114347891-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Sep 29, 2011
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

Provided are a device and a method for automatically coordinating a protection device of a smart power distribution management system, wherein a protection coordination correction value of the protection device is calculated via topology analysis and system analysis of a distribution system so as to apply the result to a smart power distribution management system. The device for automatically coordinating a protection device as provided comprises: generating the topology information by obtaining the status information of the distribution system; setting machines, which transmit and received data when an event occurs, to communicate for each of a plurality of protection devices based on the topology information; calculating a system power flow including the power flow direction based on the topology information; and calculating a fault current which is generated upon the failure of the distribution system based on the topology information, thereby generating a protection coordination correction value.

First claim

The invention claimed is:

1. An apparatus for automatically coordinating protection devices of a smart power distribution management system, the system including a plurality of measuring devices, a plurality of distributed power sources, a plurality of protection devices, a plurality of automatic switches, and a main server, comprising:
a processor including:
a status information acquisition unit for acquiring status information of a distribution system from the plurality of measuring devices;
a topology generation unit for generating topological information of the distribution system based on the acquired status information of the distribution system;
a communication setting unit for setting one or more communication target devices for transmitting/receiving data when an event occurs in the distribution system, for each of the plurality of protection devices based on the generated topological information;
a power flow calculation unit for calculating a system power flow including a power flow direction of the distribution system, based on the generated topological information;
a fault current calculation unit for calculating a fault current caused when a fault occurs in the distribution system, based on the generated topological information; and
a correction value generation unit for generating protection coordination correction values including the set communication target devices, the calculated system power flow, and the calculated fault current, for each of the plurality of protection devices,
wherein the communication setting unit separates the plurality of protection devices into corresponding areas based on the topological information, and sets left and right communication target devices for each of the plurality of protection devices.

2. The apparatus of claim 1 , wherein the status information acquisition unit acquires status information of the distribution system, including system configuration and communication-executable device information of the distribution system.

3. The apparatus of claim 1 , wherein the status information acquisition unit acquires communication-executable device information from pre-stored device information of the plurality of switches.

4. The apparatus of claim 1 , wherein the power flow calculation unit sets a reference bus of the distribution system that is an analytic unit from the topological information, sets a power flow direction of the set reference bus to a single direction, and then calculates a system power flow.

5. The apparatus of claim 1 , wherein the fault current calculation unit calculates a fault current including at least one of a fault current caused by a 3-phase short-circuit, a fault current caused by a line-to-line short-circuit, a fault current caused by a double line-ground fault, and a fault current caused by a single line-ground fault.

6. The apparatus of claim 1 , wherein the correction value generation unit generates protection coordination correction values including left and right communication target devices, a power flow direction, and a fault current, for each of the plurality of protection devices.

7. The apparatus of claim 1 , further comprising a control unit for performing control such that preset protection coordination information is corrected using the generated protection coordination correction values, and the corrected protection coordination information is transmitted to the plurality of protection devices through the main server.

8. The apparatus of claim 7 , wherein the control unit corrects directional relay information using the system power flow, and corrects a minimum operating current of each of the plurality of protection devices using the fault current.

9. The apparatus of claim 1 , further comprising a storage unit for storing protection coordination information of the distribution system, and storing device information including structures of the plurality of measuring devices, the plurality of distributed power sources, the plurality of protection devices, and the plurality of automatic switches.

10. A method for automatically coordinating protection devices of a smart power distribution management system, the system including a plurality of measuring devices, a plurality of distributed power sources, a plurality of protection devices, a plurality of automatic switches, and a main server, comprising:
acquiring status information of a distribution system from the plurality of measuring devices;
generating topological information of the distribution system based on the acquired status information of the distribution system;
setting one or more communication target devices for transmitting/receiving data when an event occurs in the distribution system, for each of the plurality of protection devices based on the generated topological information;
calculating a system power flow including a power flow direction of the distribution system, based on the generated topological information;
calculating a fault current caused when a fault occurs in the distribution system, based on the generated topological information; and
generating protection coordination correction values including the set communication target devices, the calculated system power flow, and the calculated fault current, for each of the plurality of protection devices,
wherein setting the communication target devices comprises:
dividing the distribution system into a plurality of areas based on the topological information;
separating, based on the plurality of areas, the plurality of protection devices into corresponding areas; and
setting left and right communication target devices for each of the plurality of protection devices separated into the corresponding areas.

11. The method of claim 10 , wherein acquiring the status information of the distribution system is configured to acquire status information of the distribution system, including system configuration and communication-executable device information of the distribution system.

12. The method of claim 10 , wherein acquiring the status information of the distribution system is configured to acquire communication-executable device information from pre-stored device information of the plurality of switches.

13. The method of claim 10 , wherein calculating the system power flow comprises:
setting a reference bus of the distribution system that is an analytic unit from the topological information; and
setting a power flow direction of the set reference bus to a single direction, and then calculating a system power flow.

14. The method of claim 10 , wherein calculating the fault current is configured to calculate a fault current including at least one of a fault current caused by a 3-phase short-circuit, a fault current caused by a line-to-line short-circuit, a fault current caused by a double line-ground fault, and a fault current caused by a single line-ground fault.

15. The method of claim 10 , wherein generating the protection coordination correction values is configured to generate protection coordination correction values including left and right communication target devices, a power flow direction, and a fault current, for each of the plurality of protection devices.

16. The method of claim 10 , further comprising correcting preset protection coordination information using the generated protection coordination correction values.

17. The method of claim 16 , wherein correcting the protection coordination information comprises:
correcting directional relay information using the calculated system power flow; and
correcting a minimum operating current

Assignees

• Chu Cheol-Min
• Yun Sang-Yun
• Kwon Seong-Chul
• Song Il-Keun
• Korea Electric Power Corp

Inventors

• Chu Cheol-Min
• Yun Sang-Yun
• Kwon Seong-Chul
• Song Il-Keun

Classifications

• H02H7/30

  Staggered disconnection · CPC title

• H02H7/261

  involving signal transmission between at least two stations (transmission of signals in general H02H1/0061) · CPC title

• H02H3/006

  Calibration or setting of parameters · CPC title

• H02H1/0092

  concerning the data processing means, e.g. expert systems, neural networks · CPC title

• Y04S10/20

  using protection elements, arrangements or systems · CPC title