JP2008236992A - Stabilization system and electric main protection relay arrangement of electric power system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arrangement to maintain a system linkage in place of a disconnected line by rapidly providing a preliminary line without employing a large-scale apparatus, and to stabilize the system without causing a load rejection and the like, in a power system having a preliminary supply route. <P>SOLUTION: The stabilization system of an electric power system is constituted of an input terminal for inputting a disconnection directing condition to breakers in more than one specific line, a route determination unit for determining a route disconnection in the specific line, and a connection directing output terminal for directing connection to the breakers in more than another specific line when the route is determined as disconnected by the route determination unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention aims to maintain the stability of the power system by maintaining the power supply by turning on the standby line at high speed in the event of an accident where both lines are interrupted in the parallel two-line system etc. The present invention relates to a conversion device.

  In recent years, electric power has become indispensable to people's lives, and once a power outage occurs, its impact on society is great. For this reason, in order to ensure a stable supply of power, power transmission routes have been enhanced and various measures for maintaining stability have been taken. However, in the power system, as shown in FIG. 1, it cannot be configured in a ring system due to the limitation of the circuit breaker capacity, etc., and some circuit breakers (the circuit breaker 9 in FIG. 1) are normally open (for the backup route). There is an operating system. In such a system, when both of the linked transmission lines (3 in FIG. 1) are disconnected (hereinafter referred to as route disconnection), stable power supply cannot be maintained.

As a countermeasure, for example, the method disclosed in Patent Document 1 shows a method of maintaining stability by maintaining linkage as much as possible and performing high-speed reclosing even when a two-line transmission line accident occurs. In addition, when the connection line is cut off and a separation system is generated, a method of maintaining stability by carrying out load interruption or power supply restriction (generator interruption) from the relationship between the load and power generation of the separation system, It is shown in Patent Documents 2 to 4.
Japanese Patent Laid-Open No. 3-150018 Japanese Patent Laid-Open No. 11-234905 Japanese Patent Laid-Open No. 11-215710 Japanese Patent Laid-Open No. 2-266831

  However, the methods described in Patent Documents 1 to 4 described above may not be an optimal stabilization method when there is a spare supply route. In the method of Patent Document 1, when the reclosing condition is not satisfied at the time of a two-line power transmission line accident, the two-line is cut off (route cut off), and the linkage is cut off. Further, Patent Documents 2 to 4 relate to a stabilization control method in each separation system after the linkage is cut off, and in order to maintain the stability, load interruption or the like occurs and a power failure occurs. The potential is great. The object of the present invention is to maintain a linkage in place of a line that breaks a route by introducing a spare line at high speed without using a large-scale device in the case of an electric power system having a spare supply route, An object of the present invention is to provide a device that achieves stabilization without causing interruption or the like.

  In order to achieve the above object, the invention according to claim 1 is directed to an input unit for inputting a break command condition for one or more circuit breakers of a specific line, and a route break determination for determining a route break of the specific line. And a charging command output unit that outputs a switching command to another one or more circuit breakers when it is determined that the route is disconnected. .

  According to the second aspect of the present invention, the route break determination is performed using the final break condition of the power transmission line protection relay device as an input condition instead of the break command for the breaker. Moreover, the invention which concerns on Claim 3 performs a route break determination using the accident phase detection conditions of a power transmission line protection relay apparatus.

  According to the stabilization system of the present invention, even when an accident involving two linked transmission lines occurs and the two lines are cut off by the transmission line protection relay device, the linkage is cut off. Or, depending on the final interruption condition or accident detection condition of the protective relay device, the route breakage determination is performed at a high speed before the circuit breaker opening of the associated transmission line is completed, and a load command is given to the backup line. Can be prevented from occurring. Further, since the link is maintained at high speed with the backup line, the stability of the power system can be maintained.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing the concept of the present invention. In FIG. 1, 3, 4, and 5 represent power transmission line routes. Here, each parallel two-line transmission line is used. 1A, 1B, 1C, 1D, and 1E are substations or switching stations, and a load 7 is connected to 1A. 8 and 9 are circuit breakers. 8 is normally closed and 9 is normally open. The reason why the circuit 9 is opened is to prevent the spread of accidents and to take measures when the accident current exceeds the breaking capacity of the circuit breaker 9 in the event of an accident on the transmission line 6.

  The power supply to the load 7 at all times includes a route for supplying power from the power plant 2B via 1C and the power transmission line 5, and a route for supplying power from the power plant 2A via 1B and power transmission lines 3 and 5. Here, when the accident 10 over two lines occurs in the power transmission line 3 and the two lines are interrupted (the circuit breaker 8 is opened for both lines), the power supply route from 2A to the load 7 is cut off. If left as it is, the 2A is not shown in the figure, but even if other connected loads are taken into account, the power supply becomes excessive and electric control (generator shut-off) is required, while the load 7 is in short supply and partially There is a possibility that the stability of the system cannot be maintained, such as the need for load shedding. At this time, the stabilization system can secure a route for supplying power to the load 7 from 2A through 1B and the transmission line 6 by turning on the breaker 9 at a high speed. It becomes unnecessary and can maintain stability.

  FIG. 2 is a diagram for explaining the first embodiment of the present invention, and shows details with a focus on the substation 1B. Components already described in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. In FIG. 2, the transmission line is represented by two lines, so that the first line side is labeled 81 and 91 and the second line side is labeled 82 and 92 corresponding to the circuit breakers 8 and 9. 11B1 and 11B2 are protection relay devices for the substation 1B side transmission line 3, and 11C1 and 11C2 are protection relay devices for the substation 1C side transmission line 3. 11B3 and 11B4 are protection relay devices for the substation 1B side power transmission line 6. 12B1 and 12B2 are interruption command conditions output to the circuit breakers 81 and 82 from the power transmission line protection relay devices 11B1 and 11B2. This condition may include a condition of a cutoff command by another protection relay device (for example, a bus protection relay device) or a control device in addition to the result of the operation of the power transmission line protection relay device. In addition, if 12B1 and 12B2 break command conditions include the stop condition (breaker 3-phase open or transmission line breaker open) in the OR state, the remaining line in a one-line stop state will The case where the route is interrupted can also be the subject of the present invention.

  FIG. 3 is a diagram showing an example of route break determination of the stabilization system 20. The 13 outputs obtained from the transmission line protection relay devices 11B1 and 11B2 that are the logical sum (OR) of the circuit breaker interruption command and the line stop condition are taken into the stabilization system 20. Here, 20 input units are omitted. Moreover, it is not always necessary to limit the conditions such as the disconnection command from the power transmission line protection relay device, and it may be acquired from a device in the route of the disconnection command such as another protection relay device or a control device. Next, a determination method of the route break determination unit 22 will be described. In this case, the case where it is determined that the route is disconnected when two or more phases remain in the total of two lines is shown. Of the conditions input from 11B1 and 11B2, the logical product (AND) is taken for the condition of the same name phase. The output of the AND condition 14 means that the corresponding phase is blocked for both lines. Therefore, when 15 outputs obtained by ANDing 14 outputs in different phases are established, it means that only one phase or less remains in the total of two lines. Therefore, when the output of OR16 that collects 15 outputs is established, it means that the route is disconnected. Therefore, when the route break determination is established and 16 outputs are obtained, a closing command is output to the circuit breakers 91 and 92 which are backup lines. In addition, although the input instruction | command is shown in the example output to a circuit breaker via power transmission line protection relay apparatus 11B3 and 11B4, you may pass directly to the circuit breaker from the stabilization system 20. In addition, the route disconnection judgment is explained by the method corresponding to the case where the reclosing condition of the power line protection relay device is 2 phases or more remaining in the total of 2 lines, but the 2 circuits 3 phases remaining is the reclosing condition. In the case, the route break determination condition of the stabilization system is determined to be the route break determination when at least one of the three AND 14 conditions is satisfied.

  According to the above procedure, when a disconnection command is output to the linkage circuit breaker, it is possible to determine whether or not the route is broken, and when the route is interrupted, a command is given to the backup line at a high speed to stabilize the route. .

  A second embodiment of the present invention is shown in FIG. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 4, the condition for taking out from the power line protection relay devices 11B1 and 11B2 is the final cutoff judgment condition instead of the cutoff command. The final interruption determination condition is a result of determining whether the reclosing condition is satisfied by checking the condition of the adjacent line and the opposite terminal in the power transmission line protection relay device. By determining with the condition of AND14, it is possible to reliably determine the route break. In addition, the route break determination logic is simpler.

  FIG. 5 is a diagram showing a third embodiment of the present invention. Instead of the interruption command condition of the transmission line protection relay devices 11B1 and 11B2 in the first embodiment, the accident detection condition in the protection section of the transmission line protection relay device is used for each phase. Compared with the shutoff command condition of the first embodiment, since the previous stage condition for outputting the shutoff command is used, an effect of speeding up the output of the stabilization system can be expected.

  A feature of the fourth embodiment of the present invention is that in the first to third embodiments, a synchronous parallel function is added to the condition of the input command output from the stabilization system. For the line to be turned on, input the bus voltage and the line voltage, and add the condition of the general synchronous closing relay, such as the phase difference between the bus voltage and the line voltage staying within a certain value, and confirm that the synchronization is achieved. This is the AND condition added to the input condition.

  A fifth embodiment of the present invention is shown in FIG. As a power transmission line protection relay device, a digital relay using a microprocessor has become common, and the function of the stabilization system is incorporated into the power transmission line protection relay devices 11B3 and 11B4 by using the calculation capability. It is a configuration. As a function, there is no place to replace Examples 1-4. With this method, it is possible to easily add and install a stabilizing system function without adding a device.

  A sixth embodiment of the present invention is shown in FIG. In FIG. 7, the circuit breaker 17 is a circuit breaker for busbar communication or busbar division, and is normally operated. Another difference from the other embodiments is that the circuit breakers 91 and 92 are normally closed. When the stabilization system determines that a route break occurs, the stabilization system outputs an insertion command to the circuit breaker 17. Thereby, a link is ensured via the power transmission line 6, and stabilization can be achieved.

  As another embodiment, when the circuit breaker that gives the input command is in the distance, for example, in FIG. 1, the circuit breaker 9 is closed and operated, but the circuit breaker on the substation 1A side of the transmission line 6 is opened. The case that is operated in. Since the stabilization system installed in the substation 1B determines the route break of the transmission line 3 and gives a closing command to the 1A breaker of the transmission line 6, the closing command is sent to the 1A breaker via the transmission system. Can be considered.

  In addition, when a circuit that bypasses route disconnection determination or is bypassed by switching is provided, and an accident occurs in the associated transmission line 3, the transmission line 6 that is a backup route immediately regardless of the possibility of route disconnection. There is also a method of turning on the circuit breaker 9. By this, it can give priority to throwing in as soon as possible and ensuring cooperation.

Diagram showing the concept of the present invention The figure showing the 1st Embodiment of this invention The figure which showed the detailed example of the route break determination of 1st Embodiment The figure which showed 2nd Embodiment The figure which showed 3rd Embodiment The figure which showed 5th Embodiment The figure which showed 6th Embodiment

Explanation of symbols

1A, 1B, 1C, 1D, 1E Substation / switching station 2A, 2B Power station 3 Linked transmission line 4, 5, 6 Transmission line 7 Load 8, 9 Breaker 10 Accident 11B1, 11B2 Transmission line protection relay device 11C1, 11C2 Transmission line protection relay devices 11B3 and 11B4 Transmission line protection relay device 20 Stabilization system 21 Input unit 22 Route break determination unit 23 Input command output units 13 and 16 Logical sum (OR)
14, 15 AND (AND)
17 Busbar connection or busbar breaker 81, 82, 91, 92 Transmission line breaker

Claims (9)

  An input unit for inputting a disconnection command condition for a circuit breaker of one or more specific lines, a route disconnection determination unit for determining supply route disconnection (hereinafter referred to as route disconnection) by the specific line, A power system stabilization system comprising: a power-on command output unit that issues a power-on command to another one or more circuit breakers when determined.   An input unit for inputting a final interruption determination condition of a power transmission line protection relay device for one or more specific lines, a route interruption determination unit for determining a route interruption of the specific line, and a case where it is determined that the route is disconnected A power system stabilization system comprising: a power-on command output unit that issues a power-on command to a circuit breaker of one or more specific lines.   An input unit for inputting an accident detection condition of a power line protection relay device for one or more specific lines, a route disconnection determination unit for determining the route disconnection of the specific line, and another case when the route disconnection is determined A power system stabilization system comprising: a power-on command output unit that issues a power-on command to a circuit breaker of one or more specific lines.   4. The power system stabilization system according to claim 1, wherein the one or more specific line stop conditions are added to a route disconnection determination condition.   5. The power system stabilization system according to claim 1, wherein a synchronous parallel function is added to the one or more other circuit breakers to be input. 6.   A power transmission line protection relay device, wherein the power system stabilization system according to claim 1 is housed in the device.   7. The power system stabilization system according to claim 1, wherein the one or more specific circuit breakers to be input are busbar communication or busbar circuit breakers. Stabilization system.   8. The power system stabilization system according to claim 1, wherein the input command is given to a remote circuit breaker via a communication line.   9. The power system stabilization system according to claim 1, further comprising a circuit that omits or bypasses the route break determination unit.

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