JP6129679B2 - Power system stabilization system and power system stabilization method - Google Patents

Description

  Embodiments described herein relate generally to a power system stabilization system and a power system stabilization method.

  When an accident such as a lightning strike occurs in the power system, the accident elimination relay system removes the accident at a high speed and in the minimum range, and the influence on the system is minimized.

  However, despite the operation of the accident elimination relay system, the system configuration after the accident elimination due to the occurrence of a major accident such as a delay in accident elimination due to circuit breaker malfunction, wide-range accident interruption, route interruption accident, etc. In the case of a drastic change, an abnormal phenomenon of the system may occur due to a sudden change in the tidal current and a significant imbalance in supply and demand.

  If this is left unattended, an abnormal phenomenon that occurs may spread to the entire power system and spread to a major power outage.Therefore, the occurrence of such an abnormal phenomenon or the spread of the entire system can be prevented. There is a relay system to prevent accidents.

  Accident Ripple Prevention Relay System is commonly referred to as a power system stabilization system or power system stabilization device, and it can be used in response to abnormal phenomena (step out phenomenon, frequency abnormality, voltage abnormality, overload) in the target power system. Control to prevent this.

  The power system stabilization system is often composed of a central control device, an accident detection terminal device, and a control terminal device. Accident detection terminal devices are often installed at substations, and control terminal devices are often installed at power plants. Further, the central control device may be installed at a location where communication with other devices is possible, and may be installed at the same location as the accident detection terminal device or the control terminal device. Furthermore, the central control device may be configured to include the functions of the accident detection terminal device and the control terminal device.

  At the time of a bus accident, the accident detection terminal device inputs operation information from the bus protection relay, detects the accident, and transmits the bus accident information to the central controller. Thereafter, the control terminal device installed in the power plant receives a control command from the central control device and performs control such as shutting off the generator.

  Also, the accident detection terminal device determines both bus accidents or single bus accidents from the operation signals of the bus X accident and bus Y accident input from the bus protection relay, and outputs the bus accident information to the central controller. In the conventional control target determination logic of the central control unit, the central control unit controls the bus accident information received from the accident detection terminal device installed in the substation of the bus where the accident occurred and the control contents recorded in the control table. The control target is determined by collation, and a control command is output to the control terminal device.

JP-A-9-56069

  When a bus accident occurs, the bus protection relay is activated and the accident bus is interrupted. The power system stabilization system uses the operation information of the bus protection relay to detect a bus fault at the fault detection terminal installed at the substation, and performs control necessary to maintain the stability of the power system. However, in the conventional power system stabilization system, when a failure of the accident detection terminal device occurs or when a transmission failure occurs between the accident detection terminal device and the central controller, the bus accident detection at the substation is not possible. There was a problem that it was not possible.

  The purpose of the embodiment of the present invention is to detect a bus accident even if the transmission between the accident detection terminal device installed in the substation where the bus accident has occurred or the accident detection terminal device and the central controller is poor. It is providing the electric power system stabilization system which can be controlled, and an electric power system stabilization method.

In order to solve the above problems, a power system stabilization system according to an embodiment of the present invention has the following configuration.
(A) Based on the switching information of the circuit breaker installed in the transmission line of the electric station and the current value of the current transformer, among the electric stations connected to the electric station by the transmission line, the electric station adjacent to the electric station Accident detection terminal device that detects a bus accident that occurred in
(B) A central control device that specifies a location where a busbar accident has occurred based on the detection information of the adjacent electrical station busbar accident, and determines a control target based on the identified location.

  The power system stabilization method is also an aspect of the embodiment of the present invention.

It is a block diagram which shows the structure of 1st Embodiment. It is a block diagram which shows the structure of the central control apparatus of 1st Embodiment. It is a block diagram which shows the structure of the accident detection terminal device of 1st Embodiment. It is a block diagram which shows the classification determination method of the bus accident in the bus accident classification determination part of 1st Embodiment. It is a block diagram which shows the determination method of the adjacent substation bus fault in the adjacent substation bus fault determination part of 1st Embodiment. It is the figure which showed the state of the circuit breaker in each substation when the bus accident occurred in 1st Embodiment, and the electric current which flows into power transmission line L1, L2. It is a flowchart which shows the specific procedure of the generation | occurrence | production location of a bus-line accident in the central control apparatus 4 of 1st Embodiment. It is a block diagram which shows the electric power grid stabilization system which concerns on 2nd Embodiment. It is a block diagram which shows the determination method of an accident occurrence location in the bus accident occurrence location specific part of 2nd Embodiment. It is a flowchart which shows the specific procedure of the generation | occurrence | production location of a bus-line accident in the central control apparatus 4 of 2nd Embodiment. It is a block diagram which shows the electric power grid stabilization system which concerns on 3rd Embodiment. It is a block diagram which shows the structure of the accident detection terminal device 2 which concerns on 3rd Embodiment. It is a block diagram which shows the determination method of an accident occurrence location in the bus accident occurrence location specific part of 3rd Embodiment. In 3rd Embodiment, it is a figure which shows the correlation which shows the relationship between adjacent substation bus accident information (L1) (L2), and an accident classification. It is a figure which shows the pattern of case 1 of 3rd Embodiment. It is a figure which shows the pattern of case 5 of 3rd Embodiment. It is a figure which shows the pattern of case 6 of 3rd Embodiment. It is a figure which shows the pattern of case 8 of 3rd Embodiment. It is a block diagram which shows the electric power grid stabilization system which concerns on 4th Embodiment. It is a block diagram which shows the structure of the central control apparatus of 4th Embodiment. It is a block diagram which shows the determination method of an accident occurrence location in the bus accident occurrence location specific part of 4th Embodiment. It is a flowchart which shows the specific procedure of the generation | occurrence | production location of a bus-line accident in the central control apparatus 4 of 4th Embodiment.

[First Embodiment]
The power system stabilization system according to the present embodiment will be described in detail with reference to FIG. In the power system stabilization system of the present embodiment, when an accident occurs in the power system 1, the accident detection terminal devices 2 are arranged at a plurality of substations in order to prevent the accident from spreading. This accident detection terminal device 2 is installed at each adjacent substation in the power system 1, and when an accident occurs on the bus 3 of the power system 1, it is installed at the substation adjacent to the substation where the bus accident occurred. The bus fault in the electric power system 1 is detected based on the switching information of the circuit breaker CB and the current value of the current transformer CT observed by the detected accident detection terminal device 2. An adjacent substation is a substation in which no other electric station is installed between the two corresponding substations and the two corresponding substations are connected by a transmission line.

(overall structure)
FIG. 1 is a block diagram showing a power system stabilization system according to the present embodiment. As shown in FIG. 1, the electric power system 1 transmits the electric power generated by the generator G through the buses 3a, 3b, 3c. A plurality of buses 3 exist in the electric power system 1, and the buses 3 are connected by power transmission lines L1 and L2. A substation Ass, a substation Bss, and a substation Css having a bus 3 are provided at a connection portion between the transmission lines L1 and L2. Among these, the substation Ass and the substation Bss, and the substation Bss and the substation Css are adjacent substations, and the substation Ass and the substation Css are not adjacent substations.

  In each substation, accident detection terminal devices 2a, 2b, and 2c are installed. The accident detection terminal devices 2a, 2b, and 2c are connected to the busbar protection relay 21 provided in the substation, the circuit breaker CB, and the current transformer CT. The accident detection terminal devices 2a, 2b, and 2c are input with the operation information of the bus bar protection relay 21, the switching information of the circuit breaker CB, and the current value in the current transformer CT. The accident detection terminal devices 2 a, 2 b, 2 c provided at each substation detect a busbar accident at the substation based on the operation information of the busbar protection relay 21. Moreover, the circuit breaker CB and the current transformer CT are arranged on the transmission lines L1 and L2 in the substation, and the accident detection terminal devices 2a, 2b, and 2c are the switching information of the circuit breaker CB of the substation and the current transformer CT. An adjacent substation bus fault that is a bus fault of an adjacent substation is detected based on the current value. The detection result is output to the central controller 4 as bus fault information or adjacent substation bus fault information.

  For example, when an accident occurs in the bus 3b of the substation Bss, the accident detection terminal device 2b of the substation Bss performs a bus accident based on the operation information of the bus protection relay 21 arranged in the substation. To detect. In addition, in the substation Ass and the substations Css adjacent to the substation Bss, the accident detection terminal devices 2a and 2c are connected to the adjacent substation buses based on the switching information of the circuit breaker CB of each substation and the current value of the current transformer CT. Detect accidents. The central controller 4 detects a bus fault at the substation Bss based on the bus fault information from the substation Bss or the adjacent substation bus fault information from the substation Ass and the substation Css.

(Accident detection terminal device 2)
FIG. 3 is a block diagram showing a configuration of the accident terminal detection device 2 installed in each substation. The accident terminal detection device 2 detects a bus accident at the substation based on information of the bus protection relay 21 in the installed substation. Moreover, the accident terminal detection apparatus 2 detects the bus accident in the adjacent substation from the switching information of the circuit breaker CB in the installed substation and the current value of the current transformer CT. The accident detection terminal device 2 includes a bus accident detection unit 22, an adjacent substation bus accident detection unit 23, and a signal output unit 24.

  The busbar accident detection unit 22 detects a busbar accident that has occurred in the busbar 3 of the substation where the accident terminal detection device 2 is installed. The busbar accident detection unit 22 is connected to a busbar protection relay 21 installed in the substation, and detects a busbar accident based on the operation information of the busbar protection relay 21. The normal bus 3 is composed of two buses 3X and 3Y, and the bus fault detection unit 22 detects the fault bus at each bus, thereby determining the type of bus fault, either a single bus fault or a double bus fault. Do. The bus accident detection unit 22 includes an accident bus detection unit 25 and a bus accident type determination unit 26.

  The accident bus bar detection unit 25 detects an accident bus bar. The accident busbar detection unit 25 is connected to a busbar protection relay 21 that protects the busbars X and Y. When a bus accident occurs, it is detected from the operation information of the bus protection relay 21 whether the accident is a bus X or a bus Y. The detection result is output to the bus accident type determination unit 26.

  As shown in FIG. 4, the bus accident type determination unit 26 determines the type of the generated bus accident based on information from the accident bus detection unit 25. When accident information on bus X and bus Y is input from accident bus detection unit 25, it is determined that both buses are accidents, and either one of bus X accident information or bus Y accident information is input It is determined that there is a one-bus accident. The determination result is output to the signal output unit 24.

  The adjacent substation bus fault detector 23 detects the bus fault of the adjacent substation based on the switching information of the circuit breaker CB and the current value of the current transformer CT. The adjacent substation bus fault detection unit 23 includes a circuit breaker information detection unit 27, a current detection unit 28, and an adjacent substation bus fault determination unit 29. The circuit breaker information detection unit 27 and the current detection unit 28 are connected to the circuit breaker CB and the current transformer CT installed in the substation where the accident terminal detection device 2 is installed, and based on these information, the adjacent substation Detects busbar accidents at the station.

  The circuit breaker information detection unit 27 monitors the on / off state of the circuit breaker CB in the substation, and detects whether the circuit breaker CB is in the “on” state or the “off” state. The current detection unit 28 measures the current in the transmission lines L1 and L2 of the substation, and detects “no current” in which the current flowing through the transmission lines L1 and L2 becomes zero. “No current” means that the current is smaller than a preset value. Various methods can be used as detection methods in the circuit breaker information detection unit 27 and the current detection unit 28.

  The adjacent substation bus accident determination unit 29 determines whether an adjacent substation bus accident has occurred. As shown in FIG. 5, the adjacent substation bus fault determination unit 29 determines that a bus fault has occurred at the adjacent substation when both the circuit breaker CB “ON” state and “no current” are detected. To do. The determination result is output to the signal output unit 24.

  The signal output unit 24 centralizes bus fault information based on the bus fault detected by the bus fault detection unit 22 and adjacent substation bus fault information based on the adjacent substation bus fault detected by the adjacent substation bus fault detection unit 23. Output to the control device 4. The signal output unit 24 is connected to the central control device 4 via a communication network or a communication line.

(Central control device 4)
The central controller 4 identifies the location where the bus accident occurred in the power system 1 based on the bus accident information output from the signal output unit 24 of the accident detection terminal device 2 and the adjacent substation bus accident information, A control target is determined based on the identified occurrence location. The control target is a generator G or the like, and the central control device 4 outputs a control command to the control terminal device 5 that performs control. The central control device 4 is connected to the control terminal device 5 via a communication network or a communication line. FIG. 2 is a block diagram showing the configuration of the central control device 4. As shown in FIG. 2, the central controller 4 includes a bus accident occurrence location specifying unit 41, a control target determining unit 42, and a control table 43.

  The bus accident occurrence location identifying unit 41 identifies which bus in the power system 1 has an accident based on the received adjacent substation bus accident information. As a specific method, if two substations in the power system detect a bus fault in an adjacent substation, and there is a substation adjacent to either of the two substations, the bus of the adjacent substation Assume that a bus accident has occurred at the two substations that have detected the accident and at the adjacent substation. The detection of an adjacent substation bus fault is performed by receiving adjacent substation bus fault information from the substation. That is, when the bus fault occurrence location identifying unit 41 receives the adjacent substation bus fault information from the substation Ass and the adjacent substation bus fault information from the substation Css, the substation Ass and the substation Css are received. It is specified that a bus accident has occurred at substation Bss, which is a substation adjacent to each of the substations. The identified part is output to the control target determining unit 42.

  The control target determination unit 42 controls the location of the bus accident where the bus accident occurred based on the accident bus accident information or the bus accident occurrence location specified based on the adjacent substation bus accident information, and the bus accident pattern and control stored in the control table 43. The control target is determined by checking the correspondence of the target. A control command is transmitted to the control terminal device 5 that controls the determined control target. Such a central control device 4 may be installed in the same place as the accident detection terminal device 2 or the control terminal device 5, for example.

  For example, as shown in FIG. 1, the control terminal device 5 is connected to a circuit breaker CB, a current measuring instrument, a voltage measuring instrument and the like of a power plant to which a generator G is connected. As a result, the control terminal device 5 can output a cutoff command to the circuit breaker CB based on the control command received from the central control device 4 and control the disconnection of the generator G and the like. Such a control terminal device 5 is often installed in a power plant.

(Function)
In the power system stabilization system having the configuration of the present embodiment, detection of a bus accident that has occurred in the power system 1 based on an adjacent substation bus fault from the fault detection terminal devices 2a, 2b, and 2c installed in each substation. I do.

  FIG. 6 is a diagram showing the state of the circuit breaker CB in each substation and the current flowing through the transmission lines L1 and L2 when a bus accident occurs in the substation Bss. FIG. 7 is a flowchart showing a specific procedure of a location where a bus fault has occurred when a fault occurs in the bus 3b of the substation Bss in the power system 1 to be monitored in the central controller 4.

  First, it is assumed that an accident that spans the bus X and the bus Y, that is, a bus fault occurs in the bus 3b of the substation Bss (S101). In this case, as shown in FIG. 6, in the substation Bss, the circuit breaker CB installed in the power transmission lines L1 and L2 connected to the bus 3b is turned off with the occurrence of the bus accident. On the other hand, the circuit breaker CB installed on the transmission line of the substation Ass remains in the on state because no accident has occurred in the substation Ass. Similarly, the circuit breaker CB installed in the transmission line of the substation Css is in an on state (S102).

  At this time, when the circuit breaker CB is turned off at the substation Bss, no current flows through the transmission lines L1 and L2. The current detected in the transmission lines L1 and L2 of the substation Ass is 0, and “no current” is obtained. Similarly, the current detected in the transmission line L1 of the substation Css is 0, and “no current” is set (S103).

  The adjacent substation bus fault detection unit 23 of the accident detection terminal device 2a installed in the substation Ass detects an adjacent substation bus fault when the circuit breaker CB of the substation Ass is “ON” and “no current”. Then, the information is output to the central controller 4. Similarly, in the adjacent substation bus fault detection unit 23 of the accident detection terminal device 2c installed in the substation Css, when the circuit breaker CB of the substation Css is in the “on” state and “no current”, the adjacent substation bus An accident is detected and the information is output to the central controller 4 (S104).

  Next, in the central controller 4, when adjacent bus substation accident information is input from two substations Ass and Css, the bus fault occurrence location specifying unit 41 is adjacent to the two substations Ass and Css. It is specified that a bus accident has occurred at substation Bss, which is a substation (S105).

(effect)
In the power system stabilization system of the present embodiment, a bus accident is detected based on information from the accident detection terminal device 2 installed at a substation adjacent to the substation where the bus accident has occurred. Then, control is performed according to the detected location of the bus accident.

  Therefore, even if a fault occurs in the accident detection terminal device 2 installed in the substation where the bus accident has occurred or a transmission failure occurs between the accident detection terminal device 2 and the central control device 4, it occurs in the power system 1. The detected bus accident can be detected.

  Moreover, in the electric power system stabilization system of this embodiment, the bus accident of an adjacent substation is detected based on the switching information of the circuit breaker CB, and the electric current which flows into a power transmission line. Since the “OFF” information of the circuit breaker CB is included in the condition, it can be distinguished from the power line accident.

  Further, in this embodiment, the bus accident detection unit 22 is configured to detect an accident on the bus 3 of the substation using the bus protection relay 21 installed in the substation. You may make it detect the bus accident in the electric power grid | system 1 based only on adjacent substation bus fault information, without providing itself.

  Moreover, although this embodiment demonstrated using the electric power system with which three substations continue, it is not restricted to a substation, It is the same also in all electric stations, such as a switching station, a power station, and a conversion station.

  Moreover, in this embodiment, although the bus accident in the adjacent substation was detected as an adjacent substation bus accident, it can be detected as an adjacent electric station bus accident according to the type of the adjacent electric station. In that case, it can also be set as an adjacent switch station bus accident, an adjacent power station bus accident, and an adjacent conversion station bus accident, depending on the type of electric power station.

[Second Embodiment]
The power system stabilization system of the present embodiment monitors a failure of the accident detection terminal device 2 installed in a substation where a bus accident has occurred and a transmission failure from the accident detection terminal device 2. If the accident detection terminal device 2 of the substation where the bus accident has occurred operates normally and transmission is normally performed from the accident detection terminal device 2, the accident detection provided at the substation where the accident has occurred Based on the bus accident information from the terminal device 2, a bus accident in the power system 1 is detected.

(Constitution)
The power system stabilization system according to the present embodiment will be described in detail with reference to FIG. As shown in FIG. 8, the power system stabilization system of the present embodiment detects whether or not the accident detection terminal device 2 installed in each substation has a failure in the central control device 4 of the first embodiment. The apparatus further includes a failure detection unit 44 and a transmission failure detection unit 45 that detects a failure in transmission of information from each accident detection terminal device 2 to the central control device 4.

  The failure detection unit 44 detects a failure of the accident detection terminal device 2 installed in each substation. The detection method is to transmit device information from the accident detection terminal device 2 installed at each substation and detect a device failure based on the information, or from the central control device 4 via the communication network, the accident at each substation. A failure may be detected by connecting to the detection terminal device 2.

  The transmission failure detection unit 45 detects a transmission failure from the accident detection terminal device 2 installed in each substation. The detection method is that the communication with the accident detection terminal device 2 installed at each substation is detected by the monitoring function of the central control device 4 or the transmission failure detected by the monitoring function of the accident detection terminal device 2 is detected. A signal is transmitted from the accident detection terminal device 2 and detected. Alternatively, a signal may be output from the central control device 4 to the accident detection terminal device 2 of each substation via a communication network, and a transmission failure may be detected based on the transmission state of the signal.

  The central control device 4 generates the buses generated in the power system 1 based on the bus fault information, the adjacent substation bus fault information, the failure of the accident detection terminal device 2 installed in the substation where the bus fault occurred and the transmission failure. The location where the accident occurred is specified, and a control command is output to the control terminal device 5 according to the location.

  Based on the received adjacent substation bus accident information, the bus accident occurrence location identifying unit 41 identifies which bus 3 in the power system 1 the accident has occurred. Information on the location where the identified bus accident occurred As shown in FIG. 9, the failure of the accident detection terminal device 2 installed in the substation where the bus accident has occurred and the transmission failure from the accident detection terminal device 2 Add. For example, when a bus accident occurs at the substation Bss, the bus accident occurrence location identifying unit 41 determines the location of the bus fault from the substation Bss based on the adjacent substation bus accident information from the substations Ass and Css. Is identified. As a condition for outputting this information, either a failure of the accident detection terminal device 2b of the substation Bss or a transmission failure in the accident detection terminal device 2b of the substation Bss is added.

(Function)
In the power system stabilization system having the configuration of the present embodiment, when a bus accident occurs, the failure of the accident detection terminal device 2 installed at the substation where the bus accident has occurred, and from the accident detection terminal device 2 In consideration of transmission defects, output control commands based on adjacent substation bus accident information.

  FIG. 10 is a flowchart showing a detection procedure in the central control device 4 when an accident occurs in the bus 3b of the substation Bss in the power system 1 to be monitored.

  First, it is assumed that an accident has occurred in the bus 3b of the substation Bss (S201). The failure detection unit 44 detects the presence or absence of a failure in the accident detection terminal device 2b of the substation Bss (S202). When there is no failure (N in S202), the transmission failure detection unit 45 detects the presence or absence of transmission failure in the accident detection terminal device 2b at the substation Bss (S203). If there is no transmission failure (N in S203), the central control device 4 identifies the location where the bus accident occurred based on the bus accident information from the substation Bss (S204).

  On the other hand, if there is a failure in the accident detection terminal device 2b at the substation Bss (Y in S202) or if there is a transmission failure in the accident detection terminal device 2b at the substation Bss (Y in S203), the adjacent 2 Assume that a bus accident has occurred at the substation Bss based on the adjacent substation bus fault information from the substation Ass and the substation Css, which are substations (S205 to 208).

(effect)
In the power system stabilization system of the present embodiment, when the accident detection terminal device 2 installed in the substation where the bus accident has occurred can normally detect the bus accident and transmit the information to the central controller 4, the bus Control based on bus accident information from the substation where the accident occurred.

  As a result, unnecessary response due to adjacent substation bus accident information can be suppressed, and if necessary, control based on adjacent substation bus accident information can be performed. A bus accident can be accurately detected.

[Third Embodiment]
The power system stabilization system according to the present embodiment will be described in detail with reference to FIGS. In the accident detection terminal device 2 according to the first embodiment, the present embodiment is provided with an adjacent substation busbar fault detection unit 23 (L1) (L2) for each transmission line of the substation.

(Constitution)
FIG. 11 is a block diagram showing a power system stabilization system according to the present embodiment. The bus of each substation consists of two buses, bus X and bus Y. For example, in each substation, operation is performed with the bus X and the power transmission line L1 connected, and the bus Y and the power transmission line L2 connected. The power transmission lines L1 and L2 connect the substations. In the substation, each of the transmission line L1 and the transmission line L2 includes a circuit breaker CB and a current transformer CT. Moreover, when a substation adjoins two substations, each transmission line L1 and power transmission line L2 are equipped with the circuit breaker CB and the current transformer CT. For example, in the case of the substation Bss adjacent to the substation Ass and the substation Css, the breaker CB and the current transformer CT are connected to the transmission line L1 connected to the substation Ass and the transmission line L1 connected to the substation Css. Similarly, the circuit breaker CB and the current transformer CT are installed in the power transmission line L2 connected to the substation Ass and the power transmission line L2 connected to the substation Css.

(Accident detection terminal device 2)
FIG. 12 is a block diagram illustrating a configuration of the accident detection terminal device 2 of the present embodiment. The accident detection terminal device 2 of the present embodiment includes an adjacent substation bus accident detection unit 23 for each of the power transmission line L1 and the power transmission line L2, in addition to the bus accident detection unit 22 and the accident information transmission unit 24.

  The adjacent substation bus fault detection unit 23 (L1) detects the bus accident of the bus X of the adjacent substation to which the transmission line L1 is connected based on the information on the circuit breaker CB and the current transformer CT installed in the transmission line L1. To detect. The detection result is output as adjacent substation bus accident information (L1) based on the transmission line L1.

  The adjacent substation bus fault detection unit 23 (L2) detects the bus fault of the bus Y of the adjacent substation connected to the power transmission line L2 based on the information of the circuit breaker CB and the current transformer CT installed in the power transmission line L2. To detect. The detection result is output as adjacent substation bus accident information (L2) based on the transmission line L2.

  As shown in FIG. 13, the central controller 4 identifies the location and type of the bus accident that occurred in the power system based on the bus fault information and the adjacent substation bus fault information (L1) (L2). I do. A control command is output to the control device terminal according to the location and type. Types of bus accidents: When bus 3 is composed of two buses X and Y, an accident occurs on either bus X or bus Y, or both bus X and bus Y This type indicates whether or not. If an accident occurs on one of the bus X or bus Y, it is determined as “one bus accident”. If an accident occurs on both the bus X and the bus Y, it is determined as “Both Bus Accident”.

(Function)
FIG. 14 shows the type of bus accident when a bus accident occurs at the bus at substation Bss, and the switching information of circuit breaker CB installed at transmission lines L1 and L2 detected at substation Ass and substation Css. It is a figure which shows the example of correlation with the adjacent substation bus-bar fault information (L1) (L2) based on the electric current value of current transformer CT.

  Case 1 includes adjacent substation bus fault information (L1) (L2) based on the transmission lines L1 and L2 of the substation Ass, and adjacent substation bus fault information (L1) based on the transmission lines L1 and L2 of the substation Css. (L2) is a case where none is detected, and as shown in FIG. 15, occurrence of a bus accident is not detected at the substation Bss.

  In case 2, only the adjacent substation bus fault information (L1) based on the transmission line L1 of the substation Ass is detected. In this case, the adjacent substation bus accident information (L1) based on the transmission line L1 of the substation Css is not detected. In this case, the occurrence of a bus fault is not detected at the substation Bss because it does not correspond to the case where adjacent substation bus fault information is detected at two adjacent substations.

  In case 3, the adjacent substation bus accident information (L1) (L2) based on the transmission lines L1 and L2 of the substation Ass is detected. In this case, adjacent substation bus accident information (L1) (L2) based on the transmission lines L1 and L2 of the substation Css is not detected. In this case, the occurrence of a bus fault is not detected at the substation Bss because it does not correspond to the case where adjacent substation bus fault information is detected at two adjacent substations.

  In case 4, the adjacent substation bus accident information (L1) (L2) based on the transmission lines L1 and L2 of the substation Ass is detected. In this case, adjacent substation bus fault information (L1) based on the transmission line L1 of the substation Css is detected. This case corresponds to the case where the adjacent substation bus fault information (L1) is detected in two adjacent substations. It is determined that a bus fault connecting the power transmission line L1 has occurred, and is detected as a single bus fault. To do.

  In case 5, the adjacent substation bus accident information (L1) (L2) based on the transmission lines L1 and L2 of the substation Ass is detected. In this case, adjacent substation bus accident information (L1) (L2) based on the transmission lines L1 and L2 of the substation Css is detected. This case corresponds to the case where adjacent substation bus fault information (L1) (L2) is detected in two adjacent substations, and the transmission lines L1 and L2 are connected as shown in FIG. It is determined that both bus accidents have occurred and is detected as both bus accidents.

  In case 6, the adjacent substation bus accident information (L1) based on the transmission line L1 of the substation Ass is detected. In this case, adjacent substation bus fault information (L1) based on the transmission line L1 of the substation Css is detected. This case corresponds to the case where the adjacent substation bus fault information (L1) is detected in two adjacent substations, and it is determined that a bus fault connecting the power transmission line L1 has occurred as shown in FIG. And detected as a single bus accident.

  In case 7, adjacent substation bus accident information (L2) based on the transmission line L2 of the substation Ass is detected. In this case, the adjacent substation bus accident information (L2) based on the transmission line L2 of the substation Css is detected. This case corresponds to the case where the adjacent substation bus fault information (L2) is detected at two adjacent substations, and it is determined that a bus fault connecting the power transmission line L2 has occurred, and is detected as a single bus fault. To do.

  In case 8, the adjacent substation bus accident information (L1) based on the transmission line L1 of the substation Ass is detected. In this case, the adjacent substation bus accident information (L2) based on the transmission line L2 of the substation Css is detected. This case corresponds to the case where adjacent substation bus fault information (L1) (L2) is detected in two adjacent substations, and either of the transmission lines L1 and L2 is connected as shown in FIG. It is determined that a bus accident has occurred and is detected as a single bus accident. In addition, the connection state of the bus and the transmission line of each substation is transmitted from the accident detection terminal device to the central control unit, and the condition that the transmission line L1 and the transmission line 2L are connected to the same bus in Bss Therefore, it can be detected as a single bus accident.

  In case 9, the adjacent substation bus accident information (L2) based on the transmission line L2 of the substation Ass is detected. In this case, adjacent substation bus fault information (L1) based on the transmission line L1 of the substation Css is detected. This case corresponds to the case where adjacent substation bus fault information (L1) (L2) is detected in two adjacent substations, and a bus fault that connects either of the transmission lines L1 and L2 occurs. Determine and detect as a one-bus accident. In addition, the connection state of the bus and the transmission line of each substation is transmitted from the accident detection terminal device to the central control unit, and the condition that the transmission line L1 and the transmission line 2L are connected to the same bus in Bss Therefore, it can be detected as a single bus accident.

(effect)
In the power system stabilization system of the present embodiment, the detection of a bus accident occurring in the power system is performed based on the adjacent substation bus fault information (L1) (L2) of the transmission lines L1, L2 from the fault detection terminal device. Thus, it is possible to specify not only the location where the bus accident occurred but also the type of the bus accident that occurred. As a result, control according to the type of bus accident can be performed, so excessive control can be prevented and appropriate control in the power system can be realized.

  In the present embodiment, the bus X is connected to the power transmission line L1 and the bus Y is connected to the power transmission line L2 in the adjacent substation, but the bus X is connected to the power transmission line L2 in the adjacent substation, The bus Y may be connected to the power transmission line L1. That is, the combination of power transmission lines connected to the bus is not limited. Furthermore, not only when one power transmission line is connected to one bus, but also when two power transmission lines are connected to one bus. For example, when the power transmission line L1 and the power transmission line L2 are connected to the bus X at the adjacent substation, the circuit breakers CB and the current transformer CT respectively installed in the power transmission line L1 and the power transmission line L2 in the substation. Based on the information, a single bus accident of bus X of an adjacent substation may be detected as a double bus accident.

[Fourth Embodiment]
The power system stabilization system according to the present embodiment will be described in detail with reference to FIG. In the present embodiment, a bus accident that occurs at a substation that is provided at the ends of the transmission lines L1 and L2 and that has only one adjacent substation, and an adjacent substation bus fault information that is output from one adjacent substation. Only perform detection. For example, as shown in FIG. 19, based on the adjacent substation bus accident information from the accident detection terminal device 2d provided in the substation Dss, a bus accident occurring at the substation Ess is detected.

(Constitution)
As shown in FIG. 20, the present embodiment uses the adjacent substation bus accident information transmitted from the accident detection terminal device 2 installed in each substation in the central control device 4 of the first embodiment. And an operation setting unit 46 for setting operation settings for exclusion. The operation setting unit 46 performs operation settings for “use” or “exclude” the adjacent substation bus accident information to be transmitted for each accident detection terminal device 2 installed in each substation.

  When the operation setting unit 46 sets “use”, a bus accident is detected based on the adjacent substation bus accident information from the substation. When “excluded” is set, it is assumed that the adjacent substation bus accident information is transmitted from the accident detection terminal device 2 arranged in the substation set as excluded.

  As shown in FIG. 21, the central controller 4 identifies the location of the bus accident that occurred in the power system 1 based on the bus accident information, the adjacent substation bus accident information, and the operation settings. A control command is output to the control terminal device 5 according to the location.

  The bus accident occurrence location identifying unit 41 identifies which bus 3 in the power system 1 has an accident based on the received adjacent substation bus accident information. At that time, if the operation of a certain substation is set to be excluded, it is assumed that the adjacent substation bus fault information is received from that substation. Then, it is specified that a bus accident has occurred at a substation adjacent to the substation where the operation has been excluded and the substation where the adjacent substation bus fault has been detected. For example, in the electric power system in which the substations Ass to Ess are installed, the operation setting unit 46 sets the operation settings of the substations Ass to Ess to “use”. The substation Ess is adjacent to only the substation Dss, but the virtual substation Fss adjacent to the substation Ess is provided in the power system 1, and the operation setting of the substation Fss is set to “excluded”. In the bus fault occurrence location identifying unit 41, when a bus fault occurs at the substation Ess, a bus fault has occurred at the substation Ess based on the adjacent bus fault information of the substation Dss and the substation Fss. Is identified.

(Function)
In the power system stabilization system having the configuration of the present embodiment, an adjacent substation bus fault from an adjacent substation is provided even at a substation provided at the ends of the transmission lines L1 and L2 and having only one adjacent substation. Based on the information, a bus accident is detected.

  FIG. 22 shows a bus accident based on the adjacent substation bus fault information output from the fault detection terminal device 2d of the substation Dss when a bus fault occurs at the substation Ess provided at the end of the transmission line. It is a flowchart in the case of detecting.

  In the central control device 4, operation setting is made in advance as to which substation from which the adjacent substation bus fault information is used (S401). When the substation Ess is adjacent to only the substation Dss, the adjacent substation bus accident information of the substation Dss is set to “use”. Furthermore, the adjacent substation bus accident information of the virtual substation Fss is set as “excluded”. The substation Fss is a substation that does not actually exist but is adjacent to the substation Ess together with the substation Dss.

  After the setting, it is assumed that both bus accidents occur in the bus at the substation Ess (S402). In the substation Ess, with the occurrence of an accident on the bus 3, the circuit breaker CB installed on the power transmission lines L1, L2 connected to the bus X is turned off. On the other hand, the circuit breaker CB installed in the transmission lines L1, L2 of the substation Dss is in the on state because no accident has occurred in the bus of the substation Dss (S403). At this time, when the circuit breaker CT is turned off at the substation Ess, no current flows through the transmission lines L1 and L2. Therefore, the current detected in the transmission lines L1 and L2 of the substation Dss becomes “no current” (S404).

  In the accident detection terminal device 2d installed in the substation Dss, when the circuit breaker CB of the substation Dss is in the “on” state and “no current”, the adjacent substation bus accident is detected, and the information is sent to the central controller 4 (S405).

  The central controller 4 detects a bus fault at the substation Ess based on the adjacent substation bus fault information from the substation Dss and the set operation information (S406).

(effect)
In the power system stabilization system of the present embodiment, it is possible to detect a busbar accident based on adjacent substation busbar fault information detected at an adjacent substation even at a terminal substation.

  In the present embodiment, an adjacent substation in the power system detects a bus accident that occurred in one substation based on the adjacent substation bus accident information from the accident detection terminal device 2 provided in the adjacent substation. Went. However, for example, even when there are a plurality of adjacent substations, the adjacent substations can be detected based on adjacent substation bus fault information from one substation. That is, when the accident detection terminal device 2 is not installed at the substation Dss, the operation setting unit 46 sets the operation setting of the substation Dss to “excluded”. In this case, when the adjacent substation bus fault information from the substation Bss is input, it is assumed that the bus fault occurrence location specifying unit 41 also receives the adjacent substation bus fault information from the substation Dss, and the substation Css. Identifies that a bus accident occurred.

[Other Embodiments]
The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, in this embodiment, in order to detect an adjacent substation bus fault, the condition is that the current flowing in the transmission line is 0. However, the switching information of the circuit breaker CB installed in the substation and the current information of the current transformer CT If you use, other conditions can also be used. As an example, the effective power of a transmission line provided at each substation is measured, and when the effective power is 0 and the circuit breaker CB is in an “on” state, an adjacent substation bus accident can be detected. The effective power can be calculated using the current of the transmission line and the voltage of the bus connected to the transmission line.

  In addition, the signal output unit 24 of the substation, the central control device 4, the control terminal device 5, and the central control device 4 are connected using a communication network or a communication line, but the connection method is not particularly limited. Communication networks and communication lines widely include transmission paths through which information can be exchanged. As the transmission path, any wired or wireless transmission medium can be applied, and it does not matter what kind of LAN or WAN is used. For example, power line carrier (PLC method) can also be applied. Any communication protocol that can be used at present or in the future can be applied. The current standard Internet protocol (IP4), the next generation protocol IP6, or a unique protocol may be used.

  Moreover, in this embodiment, although the substations adjoined as an electric station in an electric power grid | system, the kind of adjacent electric station does not need to be the same like substations. In other words, if the substation is adjacent to the switch station and the power plant, the bus accident that occurred on the bus of the substation can be detected by the accident detection terminal device installed in the switch station adjacent to the substation and the power plant. It is also possible to detect.

  In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Power system 2, 2a-2e Accident detection terminal device 21 Bus protection relay 22 Bus accident detection part 23 Adjacent substation bus accident detection part 24 Signal output part 25 Accident bus detection part 26 Bus accident type determination part 27 Breaker information detection part 28 Current detection unit 29 Adjacent substation bus fault determination unit 3 Bus 4 Central controller 41 Bus fault occurrence location identification unit 42 Control target determination unit 43 Control table 44 Fault detection unit 45 Transmission failure detection unit 46 Operation setting unit 5 Control terminal device Ass to Fss Substation CB Breaker CT Current Transformer G Generator

Claims (9)

Based on the switching information of the circuit breaker installed in the transmission line of the electric station and the current value of the current transformer, out of the electric stations connected to the electric station by the transmission line, it occurred in the electric station adjacent to the electric station An accident detection terminal that detects an adjacent electric power station bus accident;
Based on the detection information of the adjacent electric power station bus accident, identify the occurrence location of the bus accident, based on the identified occurrence location, a central control device that determines the control target,
Power system stabilization system with   An adjacent electric power station bus fault detection unit that detects the adjacent electric power station bus fault based on "on" information of a circuit breaker installed at the electric power station and "no current" information of a current transformer is provided. The described power system stabilization system.   A bus accident occurrence location identifying unit that detects the adjacent electrical bus fault at two electrical stations in the power system and identifies that a bus fault has occurred at an electrical station adjacent to any of the two electrical stations. The electric power system stabilization system of Claim 1 or Claim 2 provided with these. A failure detection unit for detecting a failure of the accident detection terminal device;
A transmission failure detection unit for detecting a transmission failure between the accident detection terminal device and the central control device;
Based on the operation information of the protection relay provided at the installed electrical station, the bus accident detection unit that detects the bus accident that occurred at the electrical station,
With
When a failure by the failure detection unit and a transmission failure by the transmission failure detection unit are not detected,
The power system stability according to any one of claims 1 to 3, further comprising: a bus accident occurrence location specifying unit that specifies an occurrence location of the bus fault in the power system based on the bus accident detected by the bus accident detection unit. System. A circuit breaker that interrupts the current flowing through the transmission line L1, a current transformer that detects the current flowing through the transmission line L1, and
A circuit breaker for interrupting a current flowing through the transmission line L2, a current transformer for detecting a current flowing through the transmission line L2, and
Based on the “on” information of the circuit breaker that cuts off the current flowing through the transmission line L1 and the “no current” information flowing through the transmission line L1, the adjacent electric station bus fault detection unit L1 that detects an adjacent electric station bus fault,
Based on the “on” information of the circuit breaker that cuts off the current flowing through the transmission line L2 and the “no current” information flowing through the transmission line L2, the adjacent electric station bus fault detection unit L2 that detects an adjacent electric station bus fault,
A power system stabilization system according to any one of claims 1 to 4, further comprising: The bus consists of two sets of bus X and bus Y,
The adjacent electric power station bus accident detection unit L1 detects an adjacent electric power station bus accident that has occurred in either the bus X or bus Y of the adjacent electric station,
6. The power system stabilization system according to claim 5, wherein the adjacent electric power station bus fault detection unit L2 detects an adjacent electric power station bus fault that occurs in a bus that is not detected by the adjacent electric power station bus fault detection unit L1. Based on the adjacent electrical station bus accident detected by the adjacent electrical station bus fault detection unit L1 and the adjacent electrical station bus fault detected by the adjacent electrical station bus fault detection unit L2,
The power system stabilization system according to claim 6, further comprising: a bus accident occurrence location specifying unit that specifies whether the bus accident is a single bus accident or a double bus accident along with the occurrence location of the bus fault in the power system. Establish an operation setting section to set the operation of the adjacent electric power station bus accident from each electric power station,
A bus accident occurrence that specifies that a bus accident has occurred at an electrical station that is set to be excluded from operation of the adjacent electrical station bus accident in the operation setting unit and an electrical station that has detected the adjacent electrical station bus accident. The power system stabilization system of any one of Claims 1 thru | or 6 provided with a location specific part. Based on the switching information of the circuit breaker installed in the transmission line of the electric station and the current value of the current transformer, out of the electric stations connected to the electric station by the transmission line, it occurred in the electric station adjacent to the electric station A detection step of detecting an adjacent electric power station bus accident;
A specific step of identifying the occurrence location of the bus accident based on the adjacent electric power station bus accident;
A control step for determining a control object based on the identified occurrence point;
A power system stabilization method including:

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