KR20140057720A - System of protective control for substation facilities - Google Patents

Abstract

The present invention relates to a protective control system for a substation facility and, more specifically, to a protective control system for a substation facility capable of performing protective control on a main facility of a substation based on values measured by a disconnector which is installed to protect and control the main facility of the substation and by a current sensor and a voltage sensor which are installed around a breaker. The protective control system for a substation facility given in the present invention includes: a condition determination unit which is placed in each of a plurality of banks in the substation facility, receives sensing signals from a plurality of sensors placed at the first side and the second side of a transformer included in each bank, and then determines if any abnormality occurs in each bank using the sensing signals; and a break control unit which is placed in each of the banks and controls operation of a plurality of breakers placed at the first side and the second side of the transformer included in each bank according to the determination result by the condition determination unit. According to the present invention, it is possible to reduce the number of protective relays necessary to protect a substation facility in the existing technology and accordingly to simplify the structure of a power facility protective control system.

Description

{System of protective control for substation facilities}

The present invention relates to a substation protection control system. More particularly, the present invention relates to a method and apparatus for protecting and controlling a main facility of a substation based on a value measured from a current sensor and a voltage sensor installed around a disconnector and a circuit breaker, To a substation protection control system.

Recently, since high reliability of the power system is required, digitalization and automation over the entire power system have been progressing rapidly in order to meet this requirement.

In particular, in a substation of a power system, various functions such as monitoring, protection, control, measurement, and diagnosis are required to be effectively performed. To this end, a conventional analog type substation system is called an intelligent electronic device (IED ) Based digital transmission system, and IEC 61850, which is an international standard in the communication method between intelligent electronic devices and systems, has been introduced to make various products constituting a digital transmission system as a single system It is possible to configure it to integrate.

1 is a block diagram of a conventional substation protection control system.

As shown in FIG. 1, in the conventional substation protection control system, current sensors (I11 to I28) and voltage sensors (I11 to I28), which are sensor devices for measuring current and voltage at specific points in a substation, The protection sensors (U11 and U12) and the line protection circuit (Line PROT), the bus facility protection relay (BUS PROT), the main transformer facility protection relay (MTr. PROT), the distribution line protection relay (Feeder PROT) And a protection relay such as Bay CONT.

In the case of the conventional substation protection control system, after the protection relay detects faults based on the current value or the voltage value transmitted to the protection relay after being measured by the sensor device, the blocking signal and the control signal corresponding thereto are transmitted to the circuit breaker And the operation is carried out in such a manner that the fault circuit is broken off in an inductive manner.

However, in the related art, in order to efficiently perform protection and control of substation main facilities, it is necessary to install sensor devices and protective relays near specific main facilities. In this case, signals detected in the vicinity of other major facilities, It is difficult to discriminate faults occurring due to a wide range of faults or relationships between major facilities, and it is only possible to analyze faults and to provide protection control for instantaneous accidents occurring at specific times There is a problem that failure analysis and facility protection control can not be effectively performed according to the actual time trend.

Also, in order to increase the reliability of the substation protection control system, the number of the sensor devices and the protection relays must be increased greatly, which increases the complexity of the entire substation protection control system.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-mentioned problems, and it is an object of the present invention to provide a system and a method for controlling and managing a main facility in a substation, And an object of the present invention is to provide a facility protection system.

According to another aspect of the present invention, there is provided a system for protecting a substation protection system, the system comprising: a transformer provided in each of a plurality of banks constituting the substation, A state determiner for determining whether an abnormal state has occurred in each of the banks using the sensing signal after receiving a sensing signal from a plurality of sensing sensors provided on a primary side and a secondary side of the bank; And a blocking control unit provided in each of the plurality of banks and controlling operation of a plurality of circuit breakers provided in the primary and secondary sides of the transformer included in each of the banks in accordance with the determination result of the state determination unit .

The state determination unit may map state signals transmitted from the plurality of sensing sensors to preset virtual banks according to a predetermined time interval to generate state information for each time zone of each of the banks, Information and the sensing signal are compared with each other, and it is possible to determine whether an abnormal state of each of the banks is generated according to the comparison result.

In addition, the virtual bank may include line information of each bank, transformer information included in each bank, a plurality of breaker information, and a plurality of sensor information.

The status determination unit may further include a status display unit for displaying the virtual bank, the time zone status information, and the sensing signal.

The plurality of sensing sensors may be a current sensor and a voltage sensor, and the sensing signal may be a current value and a voltage value.

The plurality of sensing sensors may further transmit sensing signal transmission time information to the status determiner, and the status determiner may map the sensing signal transmission time information and the sensing signal to a predetermined virtual bank, It is possible to generate state information for each time zone of the bank, compare the time zone state information with the detection signal, and determine whether an abnormal state of each of the banks is generated according to the comparison result.

Also, the plurality of detection sensors, the state determination unit, and the block control unit may be connected in the form of a ring network.

The system may further include a management server for receiving status information for each time zone of each bank from a status determination unit included in each of the plurality of banks and for managing the substation using the received status information.

According to the present invention, since the number of protection relays required for the protection control of the conventional substation facility can be greatly reduced, the structure of the power facility protection control system can be simplified.

In addition, since the integrated management of the entire substation facility and the management of the substation facility can be performed according to the time transition, the reliability of the protection and control system of the entire substation system can be greatly improved.

In addition, since the integrated management of the entire substation facility is possible, it has an effect of facilitating interworking with the Energe Management System (EMS) located at the upper end of the substation and the distribution / micro grid system located at the lower end.

1 is a block diagram of a conventional substation protection control system,
2 is a block diagram of a substation protection control system according to a preferred embodiment of the present invention;
3 is a network configuration reference diagram of a substation protection control system according to a preferred embodiment of the present invention, and Fig.
4 is a conceptual diagram of a management server of a substation 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. 2 is a block diagram of a substation protection control system according to a preferred embodiment of the present invention, and FIG. 3 is a network configuration reference diagram of a substation protection control system according to a preferred embodiment of the present invention.

As shown in FIGS. 2 and 3, the substation protection control system 1 according to the preferred embodiment of the present invention includes a state determination unit 10 and a shutdown control unit 20.

The state determination unit 10 is provided in each of the plurality of banks constituting the power plant and includes a primary side (i.e., a bus side M of each bank) and a secondary side of the transformer TR included in each bank In other words, a sensing signal is transmitted from a plurality of sensing sensors provided on the feeder side (F) of each bank, and it is determined whether or not an abnormal state occurs in each of the banks using the sensing signal.

In this case, the state determiner 10 may be an intelligent electronic device (IED), that is, an apparatus including a processor, a memory, an Ethernet communication interface module, and a serial communication module, (I11 to I28 in Figs. 2 and 3) and a voltage sensor (U11 and U21 in Fig. 2 and Fig. 3), and the sensing signal may be a current value and a voltage value.

The state determination unit 10 maps the sensing signals transmitted from the plurality of sensing sensors onto preset virtual banks to generate state information for each time slot of each of the banks, It is possible to determine whether an abnormal state of each of the banks is generated according to the comparison result.

To this end, the status determiner 10 may receive a sensing signal from the plurality of sensing sensors according to a predetermined time interval, or receive sensing signal transmission time information in addition to the sensing signals from the plurality of sensing sensors, It is possible to generate the state information for each of the banks by using the time zone.

Further, the virtual bank may include line information of each bank, transformer information included in each bank, a plurality of circuit breaker information, and a plurality of sensor information, , Status information by time zone, and a status indicator (not shown) on which the detection signal is displayed.

A process for determining whether or not an abnormal state has occurred in each of the plurality of banks constituting the power supply facility by the state determination unit 10 will be described below.

First, when the state determination unit 10 determines whether or not an abnormal state has occurred for protection control of the bus protecting apparatus (B1 in FIG. 2 and FIG. 3) (I.e., I11, I12, I13, I14 in Fig. 2 and Fig. 3) adjacent to the sensing sensors (i.e., the voltage sensor (U11 in Figs. 2 and 3) Voltage value and current value).

2 and FIG. 3), and compares the detected time value with the voltage value detected from the voltage sensor (U11 in FIG. 2 and FIG. 3) The sum of the current values sensed from the current sensors (I11 and I12 in FIG. 2 and FIG. 3) is compared with the current value sensed from the current sensor (I13 in FIG. 2 and FIG. 3) It is determined that the abnormal state does not occur, and the blocking control unit 20 maintains the current state. If either of the two cases is the same, It is determined that an abnormal state has occurred and the shutoff control unit 20 can control the operation of the bus protecting apparatus (B1 in FIG. 2 and FIG. 3).

2 and Fig. 3), when the state determination unit 10 determines whether or not an abnormal state has occurred for protection control of the feeder protection facility (B2 in Fig. 2 and Fig. 3) (I.e., the voltage value and the current value (i.e., the voltage value and the current value) sensed from the detection sensors (that is, the voltage sensors (U21 in FIGS. 2 and 3) and the current sensors (I21 to I28 in FIGS. ).

2 and FIG. 3) to compare the detected voltage value with the voltage value detected from the voltage sensor (U21 in FIG. 2 and FIG. 3) And then the sum of the current values sensed from the current sensor (I23 to I28 in FIG. 2 and FIG. 3) is compared with the current value sensed from the current sensor (I22 in FIG. 2 and FIG. 3) It is determined that the abnormality does not occur in both cases, and the shutoff control unit 20 maintains the current state. In either case, It is determined that an abnormal state has occurred, so that the cut-off control unit 20 can control the operation of the bus protecting equipment (B2 in FIG. 2 and FIG. 3).

Therefore, in the case of the substation protection system 1 according to the preferred embodiment of the present invention, the integrity of the sensing signals transmitted from the plurality of sensing sensors provided in the plurality of banks constituting the substation facility can be ensured.

The cut-off control unit 20 is provided in each of the plurality of banks. The cut-off control unit 20 includes a plurality of breakers provided in the primary and secondary sides of the transformers TR included in the respective banks according to the determination result of the state determiner 10 C1 to C10) and Bay (B1 and B2 in Fig. 2).

In other words, if it is determined that the abnormal state occurs in a specific portion of the line that constitutes each bank as a result of the determination by the state determination unit 10, the block control unit 20 determines that the block closest to the specific portion of the line, So that the breaker or the bay is tripped, thereby preventing the entire bank from being damaged.

In addition, the block control unit 20 may be an intelligent electronic device (IED), that is, an apparatus including a processor, a memory, an Ethernet communication interface module, and a serial communication module.

As described above, in the case of the substation protection control system 1 according to the preferred embodiment of the present invention, only the configuration of the state determination unit 10 and the block control unit 20 can detect a plurality of It is possible to control the operation of a plurality of circuit breakers and disconnectors included in each bank by determining the abnormal state after receiving the detection signal from the sensor. Therefore, the number of protection relays can be greatly reduced in comparison with the related art, The configuration of the protection control system can be simplified.

As shown in FIG. 2, in the case of the substation protection control system 1 according to the preferred embodiment of the present invention, the primary and secondary sides of the transformer TR included in each bank Each of the plurality of sensing sensors and the state determiner 10 may be connected to each other by a 1: 1 dedicated line to receive a sensing signal from the plurality of sensing sensors, 3, in consideration of a separate timing server, a network bridge switch, and the like, which are required when a 1: 1 dedicated line is connected, a plurality (two or more) of the primary and secondary sides of the transformer TR included in each bank (RW) type of the detection sensor, the state determination unit 10, and the cutoff control unit 20, and receiving a detection signal from the plurality of detection sensors It is possible.

In addition, in the case of the ring network configured as described above, it is possible to independently configure each protection function of the substation protection system 1 according to the preferred embodiment of the present invention. In other words, among the plurality of detection sensors, The state determination unit 10 and the cutoff control unit 20 can be configured in the form of a single ring network and the detection sensors and states required for protecting the first and second bus facilities among the plurality of detection sensors, The decision unit 10 and the cut-off control unit 20 can be formed in the form of one ring network. In the case of protection of the main transformer equipment and protection of the equipment by the power distribution line, the individual ring network can be configured in the same manner as described above.

Accordingly, in the case of the substation protection control system 1 according to the preferred embodiment of the present invention, it is possible to reduce the signal transmission maximum delay time due to the processing time and the propagation delay time in each sensor device, Even when traffic occurs, the minimum delay time required by the entire system can be satisfied.

In the case of the substation protection control system 1 according to the preferred embodiment of the present invention, the state detection unit 10 provided in each of the plurality of banks detects the sensing signals sensed in the respective banks, And may further include a management server for receiving the state information by time zone and using the same to integrally manage the substation facility, which will be described in detail with reference to FIG.

4 is a conceptual diagram of a management server of a substation protection control system according to a preferred embodiment of the present invention.

As shown in FIG. 4, the management server transmits the sensing signals sensed in the respective banks and the state information of each bank to the time zones from the state determination units 10a, 10b, and 10c provided in the respective banks. The management server can manage the virtual banks and the virtual banks that are preset in the state determination unit 10 provided in each of the plurality of banks, Time-based state information, and a state indicator on which the detection signal is displayed.

Accordingly, since the management server can perform the protection control monitoring of the substation facility as a whole in terms of the power system, the central server (the control center APP in FIG. 4) and the substation located at the lower end of the substation (DL / MicroGrid App in FIG. 4) can be easily connected to the substation, so that the substation can be operated in an optimum state according to the change of current and voltage of the power system outside the substation. It becomes possible to perform protection control on the data.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be possible. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . 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): a substation protection control system (10, 10a, 10b, 10c)
(20):

Claims (8)

A system for protection control of a substation, comprising:
A plurality of banks provided in each of the plurality of banks constituting the power transmission facility and receiving a sense signal from a plurality of sense sensors provided on a primary side and a secondary side of a transformer included in each bank, A state determination unit for determining whether an abnormal state occurs in the memory; And
And a blocking control unit, provided in each of the plurality of banks, for controlling the operation of a plurality of circuit breakers provided in the primary and secondary sides of the transformer included in each of the banks according to the determination result of the state determination unit. Equipment protection control system. The method according to claim 1,
The state determination unit maps state information transmitted from the plurality of sensing sensors to preset virtual banks according to a predetermined time interval to generate state information for each time slot of each of the banks, And comparing the detection signals to determine whether an abnormal state of each of the banks is generated according to a comparison result. 3. The method of claim 2,
Wherein the virtual bank includes line information of each bank, transformer information included in each bank, a plurality of circuit breaker information, and a plurality of sensor information. 3. The method of claim 2,
Wherein the status determination unit further includes a status display unit for displaying the virtual bank, the time zone status information, and the sensing signal. The method according to claim 1,
Wherein the plurality of detection sensors are a current sensor and a voltage sensor, and the detection signal is a current value and a voltage value. The method according to claim 1,
The plurality of sensing sensors further transmit sensing signal transmission time information to the status determination unit, and the status determination unit maps the sensing signal transmission time information and the sensing signal to a predetermined virtual bank, Wherein the state information for each time zone is generated, and the state information for each time zone is compared with the detection signal to determine whether an abnormal state of each of the banks is generated according to the comparison result. The method according to claim 1,
Wherein the plurality of detection sensors, the state determination unit, and the cutoff control unit are connected in the form of a ring network. 3. The method of claim 2,
Further comprising a management server for receiving the state information of each bank from the state determination unit included in each of the plurality of banks and for managing time series of state information of the respective banks, Wherein the control unit is operable to control the power supply unit.

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