JP2012253907A - Monitoring control system of power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring control system of a power system for continuously obtaining a stable operation of a power generation facility connected via a circuit breaker in the middle of a power line even during the operation in a temporary system.SOLUTION: The monitoring control system of the power system includes: substations A and B equipped with circuit breakers 4A and 4B operated by protection relays 2A and 2B; a power generator E connected via a circuit breaker 8 in the middle of the power line 1; and a transfer cut-off device 7 making the circuit breaker 8 in an off state when the circuit breaker 4A becomes the off state. Monitoring control means 11 sets the circuit breaker 4B in an on-state and the circuit breaker 4A in the off state and the transfer cut-off device 7 in a non-use mode upon operation in the temporary system supplying power from the substation B to the substation A, supplies generated power by the power generator E to the power line 1, and sets the transfer cut-off device 7 to be a use mode to control the circuit breaker 8 to be the off state when the protection relay 2B detects a fault 13 occurring in the power line 1 and the circuit breaker 4B becomes the off state.

Description

  The present invention relates to a power system monitoring control system, and is particularly useful when applied to a case where a reverse power flow may occur due to power generation equipment connected via a circuit breaker in the middle of a transmission line.

  In recent years, there has been proposed one in which a generator such as wind power is connected in the middle of a transmission line laid between two substations of an electric power system. In such a power system, a reverse power flow may occur due to the connection of the generator, and when connecting the generator to a power transmission line that is a special high-voltage piezoelectric line, In order to prevent isolated operation, it is necessary to install a transfer interrupting device together with a frequency increasing relay and a frequency decreasing relay.

  Therefore, in this type of electric power system according to the prior art, a transfer interruption device is installed at a substation that is a power transmission end in the normal system, and the power transmission end side substation is caused by a power transmission line failure (short circuit, ground fault, etc.). When the circuit breaker at the place is cut off, the generator is disconnected from the power transmission line by turning off the circuit breaker disposed between the generator and the power transmission line by the transfer circuit breaker. Here, since the transfer interrupting device is expensive, it is usually installed only at the substation that is the power transmission end in the system, and is not installed at the opposite substation.

  On the other hand, the power system may be operated by changing the system during work and failure. In other words, it is usually operated by a constant system that allows current to flow from one substation to the other substation, but when responding to work and failure as described above, the other substation can be switched to one substation. In some cases, the system is operated by a temporary system that flows current in the opposite direction. When using the temporary system, the transfer interrupter installed at the substation at the power transmission end in the regular system cannot operate the circuit breaker between the generator and the transmission line, and is opposite to the power transmission end side. Since the transfer interruption device is not installed at the substation on the side, it is impossible to prevent the generator from operating independently when the transmission line fails. For this reason, the operation of the temporary system is handled by stopping the generator. For this reason, there is a problem that power generation troubles continue during operation on a temporary system.

  There exists patent document 1 as a prior art which discloses the protection relay system in the system | strain which may produce reverse power flow. This is a spot network system to which the standby power receiving customer and the customer installing the generator are connected, using an optical communication network provided between the central monitoring and control device of the substation and the terminal device of each customer. The central monitoring and control device detects the opening of the substation circuit breaker due to the occurrence of a fault in the system, and the protection operation is obtained by transferring the circuit breaker shutdown command to the terminal device of each customer through the optical communication network. is there.

Japanese Patent Application No. 2002-135972

  As described above, in the prior art, it was necessary to stop the generator when operating in a temporary system. For this reason, the problem that a power generation trouble continues was caused.

  Moreover, in the electric power system as described above, in order to detect the state of each device in the entire system and to control the operation of each device, a monitoring control means is provided in a control station that controls the entire device. Therefore, when a new communication line is laid between the monitoring control unit of the control station and the occurrence of a failure in the transmission line during operation in the temporary system is detected by the monitoring control unit, the power generation facility and the transmission line are not connected. The above problem can be solved by configuring the circuit breaker disposed between them to be in a cut-off state. However, in this case, not only a new cost associated with the laying of the communication line is generated, but also the control through the communication line, so that the breaker is stably turned off due to a failure of the communication line or the like. I am concerned about the situation where I cannot do it. Moreover, the said patent document 1 cannot solve such a new problem effectively.

  In view of the above-described problems of the prior art, the present invention is a low-cost system capable of continuing stable operation of power generation equipment connected via a circuit breaker in the middle of a transmission line even during operation in a temporary system. It is an object of the present invention to provide a power system supervisory control system that ensures stable operation.

  According to a first aspect of the present invention, there is provided one substation including one circuit breaker operated by one protection relay, and the other substation including the other circuit breaker operated by the other protection relay. A power transmission line provided between the one and the other substation, a power generation facility connected to the middle of the power transmission line via another circuit breaker and generating a reverse power flow, and a use mode And detecting the operation state of the transfer interrupting device for turning off the other circuit breaker when the one of the circuit breakers is off, the one and the other protective relays, and the one and the other circuit breakers. And a control means for controlling the operation of the power system, wherein the control means operates the power system in a temporary system that supplies power from the other substation toward the one substation. At the time, the other circuit breaker is turned on, the one circuit breaker is turned off, the transfer circuit breaker is set to a non-use mode, and the other circuit breaker is turned on to generate power generated by the power generation facility in the transmission line. When the other protection relay detects a failure occurring in the middle of the power transmission line and detects that the other circuit breaker is in a cut-off state, The transfer circuit breaker is set in a use mode so that the other circuit breaker is turned off.

  According to this aspect, when a failure occurs in the transmission line during operation in the temporary system, the other circuit breaker is turned off by the other protective relay, and these states are detected by the control means. The control means that has received the detection result sets the transfer breaker to the use mode. At this time, since one of the circuit breakers is in the off state, the other circuit breaker is turned off by the transfer circuit breaker, and the power generation equipment is disconnected from the transmission line.

  In this way, according to this aspect, the transmission line breaker is installed only in the substation on the power transmission side during operation in the always-on system, and even when operating in the temporary system, The circuit breaker of the power generation equipment connected through the circuit breaker on the way can be turned off. Therefore, it is possible to disconnect the power generation equipment from the power transmission line when the transmission line breaks down during operation in the temporary system using the transfer interruption device, and the power generation equipment can be continued without any trouble even during operation in the temporary system. And can drive.

  Moreover, in the control means, since the transfer interrupting device is changed to the use mode upon establishment of a condition based on a plurality of information such as the disconnection information of the other circuit breaker and the failure information by the other protection relay, the other circuit breakers One circuit breaker is switched to the cut-off state by taking two conditions of AND of the establishment of the cut-off state and the change to the use mode. As a result, the reliability of such switching operation is extremely high.

  Furthermore, since the condition for turning off the other circuit breaker is determined by the state of the one circuit breaker at one substation, there is no fear of erroneous operation compared to the case where an operation signal is sent from a distance.

  According to a second aspect of the present invention, in the power system monitoring and control system described in the first aspect, the power generation facility is controlled independently from the power system. It is in the supervisory control system of the power system.

  According to this aspect, the freedom degree of the structure of the control system of power generation equipment can be improved.

According to a third aspect of the present invention, in the power system monitoring and control system described in the second aspect,
The power generation facility is in a power system monitoring and control system, wherein the power system is of an owner different from the owner of the power system.

  According to this aspect, since the power generation trouble at the time of the system change from the always-on system to the temporary system becomes unnecessary, it is possible to contribute to the improvement of the satisfaction of the customer who is the different owner.

  According to a fourth aspect of the present invention, in the power system monitoring and control system according to any one of the first to third aspects, the one circuit breaker is a primary side of the transformer of the one substation and A monitoring control system for a power system, which is arranged on the secondary side, and the transfer circuit breaker is configured to operate when one of the circuit breakers is turned off. It is in.

  According to this aspect, the transfer circuit breaker can be operated when one of the circuit breakers including two circuit breakers is turned off, and the operation of the transfer circuit breaker can be stabilized accordingly. Can do.

According to the present invention, the following effects can be obtained.
1. Even in the case where the power system needs to be changed due to work and failure, it is not necessary to stop the power generation equipment due to restrictions on the transfer interruption device when changing the system to the temporary system.
2. Since it is not necessary to stop the power generation facility due to the system change from the regular system to the temporary system, an immediate system change in an emergency can be implemented.
3. The circuit breaker placed between the power generation facility and the power transmission line is controlled by the transfer circuit breaker based on the information on the circuit breaker disconnection (power failure, etc.) and the failure information. Correspondence stability and safety can be kept high.
4). Since the existing transfer blocking device is used, it is possible to suppress the cost increase as much as possible, such as the necessity of constructing a new communication line.
5. Since there is no trouble associated with the stoppage of power generation when the system is changed, it is possible to contribute to improving the satisfaction of customers who own power generation facilities.

It is a block diagram (always power system) which shows the supervisory control system of the electric power system which concerns on embodiment of this invention. It is a block diagram (temporary system) which shows the supervisory control system of the electric power system which concerns on embodiment of this invention. It is a flowchart which shows the control aspect in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 are block diagrams showing a power system monitoring control system according to an embodiment of the present invention. As shown in both figures, one substation A (the part surrounded by the one-dotted line in the figure) is a circuit breaker 4A, 5A operated by the protection relays 2A, 3A, respectively, and a remote for exchanging predetermined information. A transmission side 7A of the transfer blocking device 7 is arranged together with the monitoring control device 6A. The other substation B (the portion surrounded by the two-dotted line in the figure) is provided with circuit breakers 4B and 5B operated by protective relays 2B and 3B, respectively, and a remote monitoring and control device 6B for exchanging predetermined information. However, the transfer blocking device 7 is not installed. This is to prevent the cost from rising.

  Here, in the case of this embodiment, the remote monitoring control devices (TC) 6A and 6B transmit predetermined information to the monitoring control means 11 of the control station D via the information collection and distribution device (DX) 10 of the control relay station C. At the same time, predetermined information transmitted by the monitoring control means 11 is received via the information collection and distribution device 10. Therefore, communication lines 14A, 14B, 15A, and 15B are laid between the remote monitoring control devices 6A and 6B and the information collection and distribution device 10, and between the information collection and distribution device 10 and the monitoring control means 11. The communication lines 16 and 17 are laid.

  Here, the predetermined information transmitted from the remote monitoring control devices 6A, 6B to the monitoring control means 11 is information indicating the status of the protection relays 2A, 2B, 3A, 3B and the status of the circuit breakers 4A, 4B, 5A, 5B. And information indicating the state of the transfer blocking device 7 are included. Each piece of information is displayed on the monitor device 12 after predetermined processing is performed by the monitoring control unit 11. On the other hand, the predetermined information transmitted from the monitoring control means 11 to the remote monitoring control devices 6A and 6B is transferred together with information for controlling the protection relays 2A to 3B and information for controlling the circuit breakers 4A to 5B. Information for controlling the shut-off device 7 is included.

  The control relay station C, for example, aggregates information on 20 to 30 substations A and B and information on the substations A and B and sends them to the control station D that supervises the power system. However, this is not always necessary, and the remote monitoring control devices 6A and 6B may be directly connected to the control station D.

  A generator E is connected through circuit breakers 8 and 9 in the middle of the transmission line 1 between the substations A and B. Here, the generator E can be configured to be controlled by an independent control system different from the power system. That is, it may be the property of another company different from the power company having the power system. In this case, the generator E and the circuit breaker 9 are the property of the other company, and the circuit breaker 8 is the property of the power company. In addition, the generator E may generate a reverse power flow with respect to the transmission line 1, and a generator of a wind power generation facility is a suitable example.

  The circuit breaker 8 is turned off by a trip signal sent when the receiving side 7B receives a cut-off signal sent by the transmission side 7A of the transfer cut-off device 7 under a predetermined condition.

  In such a power system, normally, a current is supplied from the substation A to the substation B via the power transmission line 1 and supplied to the substation A via the power transmission line 1A. This is the operation of the continuous system shown in FIG. On the other hand, when the current is temporarily supplied to the substation B via the power transmission line 1B and from the substation B to the substation A via the power transmission line 1 due to work or failure. There is. This is the operation of the temporary system shown in FIG. In this embodiment, the transfer interrupting device 7 is provided only at the substation A on the power transmission end side when operating in the always-on system.

  In such a power system supervisory control system, the circuit breakers 4A and 5A are turned on and the circuit breaker 4B is turned off during operation in the continuous system shown in FIG. This is performed by control from the control station D. As a result, the current in the transmission line 1 flows from the substation A toward the substation B. In this state, when a failure (short circuit, ground fault, etc .; the same applies hereinafter) 13 occurs in the middle of the transmission line 1, the circuit breakers 4A and 5A are turned off by the trip signals of the protection relays 2A and 3A. The transmission side 7A of the transfer cutoff device 7 sends a cutoff signal to the reception side 7B in conjunction with the OFF state of the circuit breaker 4A. As a result, the receiving side 7B turns off the circuit breaker 8 by a trip signal. As a result, the generator E is disconnected from the power transmission line 1 and its independent operation is prevented in advance.

  On the other hand, when the temporary mode shown in FIG. 2 is operated, the circuit breakers 4B and 5B are turned on and the circuit breaker 4A is turned off. The transfer blocking device 7 is set to a non-use mode. This is performed by control from the control station D. As a result, the current in the transmission line 1 flows from the substation B toward the substation A. At this time, the circuit breakers 8 and 9 are kept in the on state, and the connection to the power transmission line 1 by the generator E is continued. Incidentally, when operating the temporary system, conventionally, the circuit breaker 9 is turned off and the generator E is disconnected from the transmission line 1. When the circuit breaker 9 is owned by a business other than the power business operator of the power system, the circuit breaker 9 is requested to be operated by the business operator.

  When a failure 13 occurs in the middle of the transmission line 1 during operation in such a temporary system, the circuit breakers 4B and 5B are turned off by a trip signal from the protection relays 2B and 3B. Such a state is detected at the control station D. In response to this result, the supervisory control unit 11 puts the transfer blocking device 7 into the use mode. At this time, since the circuit breaker 4A is in the cut-off state, the transmission side 7A of the transfer cut-off device 7 sends a cut-off signal to the reception side 7B in conjunction with the cut-off state of the circuit breaker 4A. As a result, the receiving side 7B turns off the circuit breaker 8 by the trip signal, and the generator E is disconnected from the power transmission line 1. As a result, also in this case, the single operation of the generator E is prevented.

  That is, as shown in FIG. 3, the generator E is disconnected with the circuit breaker 8 turned off by an AND condition that the circuit breaker 4A is turned off and the transfer interruption device 7 is in the use mode.

  Thus, according to this aspect, the failure 13 occurs in the transmission line 1 even when operating in the temporary system using the transfer interrupting device 7 installed only in the substation on the power transmission side during operation in the normal system. When it occurs, the circuit breaker 8 can be turned off. Therefore, the generator E can be disconnected from the power transmission line 1 when the power transmission line 1 fails during operation in the temporary system using the transfer interrupting device 7. For this reason, the generator E can be continuously operated without any trouble even during operation in a temporary system.

  Moreover, in the supervisory control means 11, since the transfer interrupting device 7 is changed to the use mode when a condition based on a plurality of information such as the disconnection information of the circuit breaker 4B and the failure information by the protection relay 2B is satisfied, the circuit breaker 8 The circuit breaker 4A is switched to the cut-off state by taking the two conditions AND of the establishment of the cut-off state and the change to the use mode. As a result, the reliability of the switching operation is extremely high. Furthermore, since the condition for turning off the circuit breaker 8 is determined by the state of the circuit breaker 4A at the substation A, the possibility of erroneous operation can be drastically reduced as compared with the case where an operation signal is sent from a distance.

  In the above embodiment, the transfer interrupting device 7 is configured to send the interrupt signal depending on the state of the circuit breaker 4A. However, the present invention is not limited to this. Of course, it may be configured to send a breaking signal depending on the state of the breaker 5A.

  Moreover, although the generator E demonstrated the case where it was the property of the provider different from the electric power company which owns the said electric power grid | system, this limitation is not necessarily required. However, the unique effect of the present invention becomes remarkable when the owner is different. This is because it is not necessary to ask the owner to stop the generator E when operating the temporary system.

  Further, the control means is not limited to the monitoring control means 11 of the control station D. There is no further limitation as long as it has a predetermined detection function and control function as described above. However, if the monitoring control means 11 of the control station D is used, the existing system can be provided with a function that complements the transfer blocking function during operation in the temporary system.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used in an industrial field that includes an electric power system and supplies electric power.

A, B Substation D Control station E Generator 1, 1A, 1B Transmission line 2A, 2B, 3A, 3B Protection relay 4A, 4B, 5A, 5B Breaker 7 Transfer breaker 8, 9 Breaker 11 Monitoring control means 13 Malfunction

Claims (4)

One substation with one circuit breaker operated by one protection relay, the other substation with the other circuit breaker operated by the other protection relay, the one and the other substation A power transmission line provided in between, a power generation facility that is connected to the middle of the power transmission line via another circuit breaker and may generate a reverse power flow, and the one circuit breaker is in the off state in the use mode A transfer interrupting device for turning off the other circuit breaker, and a control means for detecting the operating state of the one and the other circuit breaker and controlling the operation of the one and other circuit breakers. In the supervisory control system of the electric power system
The control means, when operating the power system in a temporary system that supplies power from the other substation toward the one substation, turns on the other circuit breaker and turns off the one circuit breaker. State, the transfer interrupting device is set to a non-use mode, and the other circuit breaker is turned on to supply power generated by the power generation facility to the power transmission line, while a failure occurring in the middle of the power transmission line is When the protection relay detects that the other circuit breaker is turned off, the transfer circuit breaker is turned off so that the other circuit breaker is turned off via the transfer circuit breaker. A monitoring control system for an electric power system characterized by being in a use mode. In the monitoring control system of the electric power system according to claim 1,
The power generation facility is a power system monitoring and control system, wherein independent control separated from the power system is performed. In the power system monitoring and control system according to claim 2,
The power generation system is a power system monitoring and control system, wherein the power generation facility is of an owner different from the owner of the power system. In the monitoring control system of the electric power system according to any one of claims 1 to 3,
The one circuit breaker is disposed on the primary side and the secondary side of the transformer of the one substation, respectively, and the transfer circuit breaker operates when one of the circuit breakers is turned off. A power system supervisory control system, characterized in that it is configured as described above.

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