KR20150048997A - System for protective control of electric power system - Google Patents

System for protective control of electric power system Download PDF

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Publication number
KR20150048997A
KR20150048997A KR1020130128901A KR20130128901A KR20150048997A KR 20150048997 A KR20150048997 A KR 20150048997A KR 1020130128901 A KR1020130128901 A KR 1020130128901A KR 20130128901 A KR20130128901 A KR 20130128901A KR 20150048997 A KR20150048997 A KR 20150048997A
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KR
South Korea
Prior art keywords
fault current
power system
current controller
controller
data
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KR1020130128901A
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Korean (ko)
Inventor
이승렬
윤재영
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한국전기연구원
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Priority to KR1020130128901A priority Critical patent/KR20150048997A/en
Publication of KR20150048997A publication Critical patent/KR20150048997A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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  • Emergency Protection Circuit Devices (AREA)

Abstract

The present invention relates to a power system protection control system. And more particularly to a power system protection control system capable of providing reliable protection control in a power system in which a breaker and a fault current controller such as a FCL (Fault Current Limiter) or an FCC (Fault Current Controller) are simultaneously applied. The present invention relates to a control system for a fault current controller and a protection relay connected to a power system, the control system comprising: a control unit for receiving power system data or power system change data from the power system and receiving fault current controller operation state data from the fault current controller A data input unit; A fault current calculation unit for calculating a fault current of the power system using the power system data; A fault current controller controller for calculating a set value for operation of the fault current controller using the calculated fault current and a predetermined maximum allowable fault current data and transmitting the set value to the fault current controller; And a protection relay controller for calculating a set value for operation of the protection relay using the calculated fault current and a set value for the operation of the calculated fault current controller and transmitting the calculated setting value to the protection relay . According to the present invention, it is possible to provide a reliable protection control service for a power system.

Description

[0001] The present invention relates to a power control system,

The present invention relates to a power system protection control system. And more particularly to a power system protection control system capable of providing reliable protection control in a power system in which a breaker and a fault current controller such as a FCL (Fault Current Limiter) or an FCC (Fault Current Controller) are simultaneously applied.

Recently, a fault current controller such as FCL (Fault Current Limiter) or FCC (Fault Current Controller) has been actively developed as an alternative to minimize the damage in case of occurrence of fault current in the power system. It is possible to efficiently change the configuration of the existing power system when it is actually applied.

For example, a 154kV / 22.9kV transformer operates as a stand-alone type due to the fault current problem in the case of the power system under the domestic 154kV substation, while the distribution line operates as a dendrite system capable of only unidirectional transmission.

However, when a fault current controller (eg FCL) is applied to the 22.9 kV power distribution system, parallel operation of the 154 kV / 22.9 kV transformer becomes possible, and even in the case of power distribution lines, the loop configuration becomes possible, It is possible to improve the performance of the system.

The fault current controller is applied to the existing power system, but the existing power system protection control system can not easily assure the reliability of the power system.

In other words, when a fault current controller such as FCL or FCC is applied to an existing power system, a power system is operated by changing an existing power system to have another type of system configuration. In the conventional power system protection control system, There is a problem in that there is a limitation in providing a highly reliable protection control for the power system by accurately reflecting the operation state of the fault current controller.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a fault current controller and a protection relay for determining a set value of a fault current controller and a protection relay for maintaining an appropriate fault current level reflecting a power system configuration, And to provide a power system protection control system that enables real-time protection control of a power system by determining the setting of a fault current controller and a protection relay in real time when the same system change occurs.

According to another aspect of the present invention, there is provided a control system for a fault current controller and a protection relay connected to a power system, the control system comprising: A data input unit receiving a fault current controller operation state data from the fault current controller; A fault current calculation unit for calculating a fault current of the power system using the power system data; A fault current controller controller for calculating a set value for operation of the fault current controller using the calculated fault current and a predetermined maximum allowable fault current data and transmitting the set value to the fault current controller; And a protection relay controller for calculating a set value for operation of the protection relay using the calculated fault current and a set value for the operation of the calculated fault current controller and transmitting the calculated setting value to the protection relay .

The data input unit may include a system data input unit receiving the power system data, a system change data input unit receiving the power system change data, and a fault current controller state data input unit receiving the fault current controller operation state data .

The fixed current calculator may recalculate the fault current of the power system using the power system change data when the power system change data is transmitted through the system change data input unit.

In addition, the fault current controller controller may calculate a correction value for the fault current controller operation in the modified power system using the recalculated fault current and the maximum permissible fault current data, and transmit the calculated correction value to the fault current controller .

The protection relay operation control unit may calculate a correction value for the operation of the protection relay in the changed power system using the recalculated fault current and a correction value for the fault current controller operation and transmit the correction value to the protection relay have.

The fault current calculator may recalculate the fault current of the power system when it is determined that the operation of the fault current controller is stopped according to the operation state data transmitted through the fault current controller operation data input unit.

In addition, the protection relay control unit may calculate a correction value for the protection relay operation in a state where the fault current controller is not operated according to the re-calculated fault current, and may transmit the correction value to the protection relay.

Also, the fault current controller may be a fault current limiter (FCL) or a fault current controller (FCC).

In addition, the protective relay may be an overcurrent relay, a distance relay, a low voltage relay, or a high voltage relay.

According to the present invention, in a power system in which a breaker and a fault current controller such as a FCL (Fault Current Limiter) or an FCC (Fault Current Controller) are simultaneously applied, a system change such as a change in the power system or an abnormal operation of the fault current control device The fault current controller and the protection relay can be operated in accordance with the determination of the set value for the operation of the fault current controller and the protection relay in real time, thereby providing a reliable protection control service for the power system.

1 is a block diagram of a power system protection control system according to a preferred embodiment of the present invention;
FIG. 2 is a detailed block diagram of the data input unit of FIG. 1, and FIG.
3 is a functional block diagram of a power system protection control system according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Further, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be practiced by those skilled in the art.

FIG. 1 is a block diagram of a power system protection control system according to a preferred embodiment of the present invention, and FIG. 2 is a detailed block diagram of the data input unit of FIG.

1, a power system protection control system 1 according to a preferred embodiment of the present invention includes a data input unit 10, a fault current calculation unit 20, a fault current controller operation control unit 30, And an operation control unit (40).

The data input unit 10 receives the power system data or the power system change data from the power system and receives the fault current controller operation state data from the fault current controller associated with the power system.

As shown in FIG. 2, the data input unit 10 includes a system data input unit 11 for receiving the power system data, a system change data input unit 13 for receiving the power system change data, And a fault current controller state data input unit 15 receiving operation state data. The fault current controller may be a fault current limiter (FCL) or a fault current controller (FCC).

Here, the power system data includes the type, number, position, and components of the components (e.g., line, generator, transformer, breaker, fault current controller, And the status data may include whether or not the circuit breaker is opened / closed, transmission / distribution line length / impedance, and transformer impedance data.

Also, the power system change data refers to the type, number, location, and state data for each of the added components of the removed or added components when the configuration of the power system is changed, Whether the circuit breaker is open or closed, the extended transmission line length / impedance, and the added transformer impedance.

In addition, the fault current controller operation state data refers to data for determining whether the fault current controller operates or not, and may be normal operation data or operation stop data, for example.

The fault current calculation unit 20 calculates the fault current of the power system using the power system data transmitted through the system data input unit 11.

At this time, since the process of calculating the fault current of the power system is well known, a detailed description thereof will be omitted.

In addition, when the power system change data is transmitted through the system change data input unit 13, the fault current calculation unit 20 recalculates the fault current of the power system using the power system change data, If it is determined that the operation of the fault current controller is stopped according to the fault current controller operation state data transmitted through the controller state data input unit 15 (in other words, the operation stop data is transmitted to the fault current calculation unit 20 The fault current of the power system can be recalculated (in other words, the fault current in the power system is assumed to be absent and the fault current of the power system is recalculated)

The fault current controller operation control unit 30 calculates a set value for operation of the fault current controller using the fault current of the power system and the predetermined maximum allowable fault current data calculated by the fault current calculation unit 20, To the fault current controller.

At this time, the setting value for the operation of the fault current controller, which is calculated by the fault current controller operation control unit 30, may be the current-wave impedance of the fault current controller.

In other words, when the calculated fault current actually occurs in the power system, the fault current controller operation control unit 30 actually operates the fault current controller, and if the calculated fault current exceeds the maximum allowable fault current (for example, The rated break current of the breaker associated with the power system) of the fault current controller can be calculated.

In addition, the fault current controller operation control unit 30 may be configured such that when the fault current calculation unit 20 recalculates the fault current of the power system using the power system change data, the recalculated fault current and the maximum allowable fault current Calculates a correction value for the fault current controller operation in the modified power system, and transmits the calculated correction value to the fault current controller.

At this time, the correction value for operation of the fault current controller, which is calculated by the fault current controller operation control unit 30, may be a current wave impedance of the fault current controller.

In other words, when the recalculated fault current actually occurs in the power system, the fault current controller operation controller 30 actually operates so that the recalculated fault current becomes the maximum allowable fault current (e.g., , The rated breaking current of the circuit-breaker associated with the power system) of the fault current controller.

The protection relay operation control unit 40 uses the fault current of the power system calculated by the fault current calculation unit 20 and the setting value for the operation of the fault current controller calculated by the fault current controller operation control unit 30, Calculates a set value for the operation of the relay and transmits it to the protection relay.

In this case, the protection relay may be an overcurrent relay, a distance relay, a low voltage relay, or a high voltage relay, and the setting value may be an instantaneous / time TAP and an instantaneous value of an overcurrent relay, an impedance value of a distance relay, Which may be a predetermined voltage value.

In other words, when the calculated fault current actually occurs in the power system, the protective relay operation control unit 40 determines whether the fault current is generated in the power system in consideration of the magnitude of the fault current reduced by the operation of the fault current controller according to the set value. You can calculate setting values for operation.

In addition, when the fault current calculation unit 20 recalculates the fault current of the power system according to the power system change data, the protective relay operation control unit 40 controls the re-calculated fault current and the fault current controller operation controller 30), calculates a correction value for the protection relay operation, and transmits the calculated correction value to the fault current controller.

At this time, the correction value for the operation of the protection relay may be an instantaneous / instantaneous TAP and a time delay of the overcurrent relay, an impedance size of the distance relay, or a scheduled voltage value of the low voltage relay and the high voltage relay.

In other words, when the recalculated fault current actually occurs in the power system, the protection relay operation control unit 40 controls the protection relay in consideration of the magnitude of the fault current, which is reduced by the operation of the fault current controller according to the above- Lt; / RTI > can be calculated.

In addition, when the fault current calculation unit 20 recalculates the fault current of the power system in accordance with the fault current controller operation state data, the protective relay operation control unit 40 uses the recalculated fault current to perform the protection Calculates the setpoint for relay operation and sends it to the fault current controller.

At this time, the correction value for the operation of the protection relay may be the instantaneous / instantaneous TAP of the overcurrent relay and the instantaneous leakage or the impedance of the distance relay.

In other words, the protection relay operation control unit 40 determines whether the calculated fault current actually occurs in the power system, and if the fault current controller is not operating, considering the magnitude of the fault current, Politics can be calculated.

3 is a functional block diagram of a power system protection system according to a preferred embodiment of the present invention.

3, in the case of the power system protection system 1 of the present invention, the data input unit 10 receives the power system data or the power system change data from the power system and receives the fault current controller (FCL / FCC And receives fault current controller operation state data from the fault current controller.

The fault current calculation unit 20 calculates the fault current of the power system using the power system data and transmits the calculated fault current to the fault current controller operation control unit 30 and the protection relay operation control unit 40.

The fault current controller operation controller 30 calculates a set value for operation of the fault current controller using the calculated fault current and the maximum permissible fault current data and transmits the set value to the fixed current controller, The controller 40 calculates a set value for operation of the protection relay (51P, 51S in Fig. 3) using the calculated fault current and the set value for operation of the fault current controller, and operates the protection relay.

The fault current calculation unit 20 recalculates the fault current of the power system using the power system change data when the power system change data is transmitted through the system change data input unit 13, And transmits the fault current to the fault current controller operation control unit 30 and the protection relay operation control unit 40.

The fault current controller operation controller 30 calculates the correct value for the operation of the fault current controller using the recalculated fault current and the maximum permissible fault current data and transmits the calculated value to the fixed current controller, The control unit 40 calculates a correction value for operation of the protection relay (51P, 51S in FIG. 3) using the recalculated fault current and the correction value, and operates the protection relay.

The fault current calculator 20 calculates the fault current controller 20 based on the fault current controller operation state data transmitted through the fault current controller state data input unit 13 when the operation of the fault current controller is determined to be stopped, Calculates the current for operation of the protection relay using the recalculated fault current, and transmits it to the protective relay operation controller 40. The protective relay operation controller 40 calculates the current for the operation of the protection relay, Lt; / RTI >

Therefore, in the case of the present invention, a system change such as a power system change or a fault current control device operation abnormality occurs in a power system in which a breaker and a fault current controller such as FCL (Fault Current Limiter) or FCC The fault current controller and the protection relay can be operated in real time after determining the setting for the operation of the fault current controller and the protection relay in real time so that it is possible to provide a reliable protection control service for the power system do.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments described in the present invention are intended to illustrate rather than limit the technical spirit of the present invention, and the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

(1): Power system protection control system (10): Data input unit
(20): fault current calculation unit (30): fault current controller
(40): Protection relay operation control unit

Claims (9)

A control system for a fault current controller and a protection relay connected to a power system,
A data input unit receiving power system data or power system change data from the power system and receiving fault current controller operation state data from the fault current controller;
A fault current calculation unit for calculating a fault current of the power system using the power system data;
A fault current controller controller for calculating a set value for operation of the fault current controller using the calculated fault current and a predetermined maximum allowable fault current data and transmitting the set value to the fault current controller; And
And a protection relay controller for calculating a set value for operation of the protection relay using the calculated fault current and a set value for operation of the calculated fault current controller and transmitting the calculated value to the protection relay Grid protection control system. The method according to claim 1,
The data input unit may include a system data input unit receiving the power system data, a system change data input unit receiving the power system change data, and a fault current controller state data input unit receiving the fault current controller operation state data The power system protection control system. 3. The method of claim 2,
Wherein the fixed current calculation unit recalculates a fault current of the power system using the power system change data when the power system change data is transmitted through the system change data input unit. The method of claim 3,
Wherein the fault current controller controller calculates a correction value for operation of the fault current controller in the modified power system using the recalculated fault current and the maximum permissible fault current data and transmits the calculated correction value to the fault current controller Power system protection control system. 5. The method of claim 4,
The protection relay operation control unit calculates a correction value for the protection relay operation in the power system changed by using the recalculated fault current and the calculated correction value for the fault current controller operation and transmits the calculated correction value to the protection relay Wherein said power system protection control system comprises: 3. The method of claim 2,
Wherein the fault current calculation unit recalculates a fault current of the power system when it is determined that the operation of the fault current controller is stopped according to the operation state data transmitted through the fault current controller operation data input unit Grid protection control system. The method according to claim 6,
Wherein the protection relay control unit calculates a correction value for the protection relay operation in a state in which the fault current controller is not operated according to the re-calculated fault current, and transmits the calculated correction value to the protection relay system. The method according to claim 1,
Wherein the fault current controller is an FCL (Fault Current Limiter) or an FCC (Fault Current Controller). The method according to claim 1,
Wherein the protection relay is an overcurrent relay, a distance relay, a low voltage relay, or a high voltage relay.
KR1020130128901A 2013-10-29 2013-10-29 System for protective control of electric power system KR20150048997A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107919646A (en) * 2017-10-19 2018-04-17 广东电网有限责任公司电力科学研究院 The current protection setting method and device of a kind of power distribution network containing photovoltaic
KR20230068618A (en) * 2021-11-11 2023-05-18 전남대학교산학협력단 System for protection management of lvds distribution and method for protection management

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107919646A (en) * 2017-10-19 2018-04-17 广东电网有限责任公司电力科学研究院 The current protection setting method and device of a kind of power distribution network containing photovoltaic
CN107919646B (en) * 2017-10-19 2019-04-26 广东电网有限责任公司电力科学研究院 A kind of the current protection setting method and device of the power distribution network containing photovoltaic
KR20230068618A (en) * 2021-11-11 2023-05-18 전남대학교산학협력단 System for protection management of lvds distribution and method for protection management

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