JP5468272B2 - Power system measurement system - Google Patents

Description

  The present invention relates to a power system measurement system that detects a change in the state of a power system and measures the amount of electricity in the power system.

  FIG. 17 shows a system configuration of a network type fault location device (fault locator) used in a typical conventional power system. FIG. 18 is a time chart showing the procedure of freezing the data of the grid electricity quantity in the power grid measurement system of FIG.

  In the network type fault locator, the measurement terminal device 101 and the master station device 102 are connected via a communication network. The measurement terminal device 101 constantly measures the system electricity quantity (voltage and current), temporarily stores it for a predetermined period, and overwrites the old data sequentially when a new system electricity quantity is taken in after the predetermined period has passed. It has become.

  When a system failure occurs, the measurement terminal device 101 detects the failure, and freezes the system electric quantity before and after the system failure using this as a trigger signal. That is, the data temporarily stored at that time is stored as frozen data.

  Next, when the failure is removed by the protective relay device (relay panel) 103, the trip information (52TX) is passed from the protective relay device 103 to the measurement terminal device 101, and the measurement terminal device 101 transmits the trip information to the master station device 102. The trip information and the operation time at the time of trip are added and transmitted. When the master station apparatus 102 receives the trip information, it makes a transmission request to the measurement terminal apparatus 101 for system information of several cycles before the reference time and several cycles after the reference time, based on the operation time of the trip information. The measurement terminal device 101 cuts out request data from the recorded data and transmits it to the master station device 102.

  On the other hand, in the “control system incorporating an automatic oscilloscope” disclosed in Patent Document 1, a transmission request for data in a required time interval is made from data recorded by a plurality of distributed control devices.

  In this system, a distributed control device and a protection device are distributedly arranged corresponding to each of a plurality of facilities such as a power transmission line, and each of these distributed control devices and a supervisory control device and an oscilloscope processing device for monitoring and controlling the entire electric station, Are connected via a LAN. And the current transformer (CT) and the instrument transformer (PT) are connected to the distributed control apparatus. An oscilloscope output device is connected to the oscilloscope processor.

  When a system fault occurs, the corresponding protection device operates, and accident information is transmitted from the protection device to the oscilloscope processing device via the LAN via the distributed control device. When the oscilloscope processing device receives this failure information, it determines that the oscilloscope start condition is satisfied, and sends oscilloscope start signals to all the distributed control devices all at once. Each distributed control device stores the recording data after receiving the oscilloscope start signal from the oscilloscope processing device. Thereafter, based on the time at the time of starting, the sampling data before and after the starting is sent to the oscilloscope processing device.

Japanese Patent Laid-Open No. 2-101938

  In the current network type fault locator, unless the measurement terminal device receives the trip information (52TX) from the protective relay device, the measurement terminal device does not transmit the trip information to the master station device. There is a problem that is not implemented.

  In the measurement terminal device far from the system failure occurrence point, the change in the amount of electricity is small and the trigger signal may not be detected, and system information may not be recorded. For this reason, there has been a problem that system information can be collected only in the region where the system phenomenon is detected.

  In the technology disclosed in Patent Document 1, the protection device detects that an accident has occurred in the system, and the accident information is relayed through the distributed control device and transmitted to the oscilloscope processing device. The processing device makes a recording data transmission request to each distributed control device. Therefore, there is a problem that data cannot be recorded when the protective device does not detect a system fault.

  In addition, current oscilloscopes are mainly installed at each power station, and the power stations (substations) that the power station has jurisdiction are limited. Therefore, the data collection range of the oscilloscope is naturally limited.

  Therefore, when performing an oscilloscope analysis when a system failure occurs, it is necessary to perform a failure analysis using data of a plurality of electric stations, but at present there is a problem that only an offline analysis is possible.

  The present invention has been made in view of such circumstances, and when a power system failure occurs, a trigger signal based on a change in the amount of electricity is detected by the measurement terminal device due to circumstances such as being far from the failure occurrence point. Even if it is not, the purpose is to enable collection of system information.

In order to achieve the above object, a power system measurement system according to the present invention is a power system measurement system including a plurality of measurement terminal devices installed in a plurality of electrical stations and connected to each other via a communication network. Each of the plurality of measurement terminal devices detects at least information including the voltage and current of the power system as a status signal, holds the status signal detected by the detection means for a predetermined period, and detects the status signal. State signal holding means for sequentially overwriting with a newly detected state signal after a lapse of a predetermined period, and a part of the state signal detected by the detecting means as a trigger signal via the communication network A delivery means for delivering the trigger signal and a signal related to the time of the trigger signal to another measurement terminal device; and a status signal holding means. Of the lifting has been that the status signal, a status signal before and after the predetermined period of said detected trigger signal distributed by said trigger signal or said delivery means in the measurement terminal device, a cryopreservation means for cryopreservation, Depending on the type of the trigger signal detected by the detection means of the measurement terminal device or distributed from another measurement terminal device, the trigger signal and a signal related to the time of the trigger signal are sent to other measurement terminals. Distribution determination means for determining where to distribute among the devices, and the distribution means includes only the trigger signal and the trigger signal of the measurement terminal device determined to be distributed by the distribution determination means. It distributes the signal regarding time .
Another aspect of the power system measurement system according to the present invention is a power system including a plurality of measurement terminal devices installed at a plurality of electrical stations and connected to each other via a communication network and at least one data recording device. In the measurement system, each of the plurality of measurement terminal devices detects, as a state signal, information including at least the voltage and current of the power system, and holds the state signal detected by the detection unit for a predetermined period. A state signal holding means for sequentially overwriting with a newly detected state signal after a lapse of a predetermined period after the state signal is detected, and a part of the state signal detected by the detecting means as a trigger signal, Trigger that transmits the trigger signal and a signal related to the time of the trigger signal to the data recording device via a communication network A first trigger receiving means for receiving a trigger signal and a signal related to the time of the trigger signal from the data recording device via the communication network, and a status signal held in the status signal holding means Among them, the trigger signal detected by the measurement terminal device or the status signal of a predetermined period before and after the trigger signal received by the first trigger reception is transmitted to the data recording device via the communication network. Data transmitting means, and cryopreservation means for cryopreserving the status signal transmitted from the data recording device, wherein the data recording device is transmitted by the trigger transmitting means of the plurality of measurement terminal devices A second trigger signal receiving means for receiving a trigger signal and a signal related to a time of the trigger signal; and the second trigger signal receiving means. Depending on the type of the trigger signal received by the means, the trigger signal and the signal related to the time of the trigger signal may be sent to any of a plurality of measurement terminal devices other than the original measurement terminal device from which the trigger signal was transmitted. A measurement terminal device that is determined to distribute the distribution determination unit that determines whether to distribute, the trigger signal received by the second trigger signal reception unit, and a signal related to the time of the trigger signal by the distribution determination unit And a trigger signal distribution means for distributing the signal.

  According to the present invention, it is possible to measure a quantity of electricity and record data over a wide area at the same timing as the detection time of a system phenomenon detected at an arbitrary electric station. Thereby, detailed system phenomenon analysis becomes possible.

1 is a system diagram showing a configuration of a first embodiment of a power system measurement system according to the present invention. 1 is a circuit diagram showing a system configuration of an electric station measurement terminal device in a first embodiment of a power system measurement system according to the present invention. FIG. FIG. 3 is an explanatory diagram schematically showing a module configuration of each electric station measurement terminal device in the first embodiment of the power system measurement system according to the present invention. 3 is a flowchart showing a flow of data recording of system electricity quantity in the first embodiment of the power system measuring system according to the present invention. 3 is a time chart showing a procedure for freezing data on the grid electricity quantity in the first embodiment of the power grid measurement system according to the present invention. It is explanatory drawing which shows typically the module structure of each electric station measurement terminal device in 2nd Embodiment of the electric power system measuring system which concerns on this invention. It is a determination table of the sequence processing in the second embodiment of the power system measurement system according to the present invention. It is a flowchart which shows the determination flow of the sequence process part in 2nd Embodiment of the electric power system measurement system which concerns on this invention. It is explanatory drawing which shows typically the module structure of each electric station measurement terminal device in 3rd Embodiment of the electric power system measurement system which concerns on this invention. It is a determination table of the sequence processing in the third embodiment of the power system measurement system according to the present invention. It is explanatory drawing which shows typically the trigger output setting part in 4th Embodiment of the electric power system measuring system which concerns on this invention. It is a systematic diagram which shows the structure of 5th Embodiment of the electric power system measurement system which concerns on this invention. It is explanatory drawing which shows typically the module structure of each electric station measurement terminal device in 5th Embodiment of the electric power grid | system measurement system which concerns on this invention. It is a flowchart which shows the flow of the data recording of the system electric quantity in 5th Embodiment of the electric power system measurement system which concerns on this invention. It is explanatory drawing which shows typically the module structure of each electric station measurement terminal device in 6th Embodiment of the electric power system measurement system which concerns on this invention. It is a trigger signal output range settling table in a 6th embodiment of a power system measuring system concerning the present invention. It is explanatory drawing which shows the structural example of the conventional electric power system measurement system. It is a time chart which shows the procedure of the data freezing of the system electric quantity in the electric power system measuring system of FIG.

  Hereinafter, an embodiment of a power system measurement system according to the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First embodiment]
FIG. 1 is a system diagram showing a configuration of a first embodiment of a power system measurement system according to the present invention. FIG. 2 is a circuit diagram showing a system configuration of the electric station measurement terminal device according to the first embodiment. FIG. 3 is a circuit diagram showing a configuration of the electric station measurement terminal device according to the first embodiment. FIG. 4 is a flowchart showing the flow of data recording of the grid electricity quantity in the first embodiment. FIG. 5 is a time chart showing the procedure for freezing the data of the grid electricity quantity in the first embodiment.

  As shown in FIG. 1, the electric station measurement terminal device 1 is installed in each of the A electric station to the N electric station, and these are connected via a communication network 20.

  As shown in FIG. 2, the electric power station measuring terminal device 1 includes a high-voltage system bus voltage, a transmission line current, a transformer primary / secondary side current, a low-voltage system bus voltage, a transformer tap value, and a cutoff from a protection device. The device control command signal is taken in. Further, a protective relay (protective relay) 15 for repairing the failure is arranged.

  As shown in FIG. 3, each electric power station measuring terminal device 1 includes a start condition detecting unit 2 that detects a change in system state, a sequence processing unit 3 that determines a recording data type based on the start condition, and a record that records system information. It has a data part 4, a trigger command output part 5, and a trigger command input part 6. The measurement terminal device 1 is a structure in which the system electricity quantity (voltage and current) is constantly measured and temporarily stored for a predetermined period, and when the new system electricity quantity is taken in after the predetermined period has passed, the old data is sequentially overwritten. It has become.

  As shown in FIGS. 4 and 5, when a system failure occurs (step S1), the failure detection relay operates in the measurement terminal device at the electric power station A (step S2). Using this as a trigger activation signal, the system electricity quantity (voltage and current) of several cycles before and after the occurrence of system failure is recorded (freeze-stored) as frozen data (step S3). In addition, the measurement terminal device at the electric power station A adds the system failure occurrence time to the trigger activation signal and distributes it to the measurement terminal device at the other electric power station (step S4). The measurement terminal devices at the B, C, and N electric stations that have received this trigger activation signal record the system electricity quantity (voltage and current) for several cycles before and after the occurrence of the system failure based on the absolute time added to the trigger activation signal. (Freeze storage) (step S5).

  According to the first embodiment described above, it is possible to collect system information even at an electrical station where failure is not detected at an electrical station far from the system failure. Furthermore, it becomes possible to grasp a wide range of system phenomena at the same time.

[Second Embodiment]
FIG. 6 is an explanatory diagram schematically showing the module configuration of each electric station measurement terminal device in the second embodiment of the power system measurement system according to the present invention. FIG. 7 is a determination table for sequence processing according to the second embodiment. FIG. 8 is a flowchart showing a determination flow of the sequence processing unit in the second embodiment.

In this embodiment, the measurement terminal apparatus 1 at the B electric station receives the trigger signal from the measurement terminal apparatus 1 at the A electric station (step S11), and the sequence processor 3 transmits the trigger signal to another electric station. Judgment of necessity is performed. That is, in the illustrated example, first, it is determined whether or not the trigger signal type is 1 (step S12). If this is Yes, the trigger signal is distributed to the measurement terminal device group C to perform data recording (freeze storage). A determination process is performed (step S13). Next, it is determined whether or not the trigger signal type is 2 (step S14). If this is Yes, the trigger signal is distributed to the measurement terminal device group D (step S15). Next, it is determined whether or not the trigger signal type is 3 (step S16), and if this is Yes, the trigger signal is distributed to the measurement terminal device groups C and D (step S17). If the trigger signal type is not 1, 2 or 3, the trigger is not distributed to other electrical stations (step S18).

  According to this embodiment, it becomes possible to collect wide-area system information by the same event, and a wide-area system analysis becomes possible.

[Third Embodiment]
FIG. 9 is an explanatory diagram schematically showing a module configuration of each electric station measurement terminal device in the third embodiment of the power system measurement system according to the present invention. FIG. 10 is a determination table for sequence processing according to the third embodiment.

In this embodiment, a trigger signal from the electric power station measuring terminal device at the electric power station A is received by the measuring device trigger command input unit 6 of the electric power station meter at the electric power station B, and the recorded data 4 is received in response to the trigger command. The sequence processing unit 3 determines whether or not to record data (freeze storage).

Upon receipt of the trigger signal from the measurement terminal device at the A electric station, the electric station measurement terminal device at the B electric station determines the type of activation condition detected by the electric station measurement terminal device and the trigger received from the A electric station. The sequence processing unit 3 determines whether or not data recording (freezing storage) is necessary depending on the signal type, and performs data recording (freezing storage).

  When the trigger signal type 1 is received from the A electric station and the activation condition type 1 is detected by the measurement terminal device 1 at the B electric station, data recording (freezing storage) is performed. However, when the activation condition type 2 is detected, data recording (freezing storage) is not performed. Similarly, when the trigger signal type 2 is received and the activation condition type 1 is detected by the measurement terminal device 1, data recording (freezing storage) is performed, but when the activation condition type 2 is detected, Data recording (freezing storage) will not be performed.

  According to this embodiment, when a trigger signal is received, a late arrival trigger signal is not received during data recording (freezing storage), and data recording processing is preferentially performed. If it is set to perform data recording (freeze storage) for all received trigger signals, data recording (freeze storage) processing is performed even with unnecessary trigger signals, and data recording with the necessary trigger signals is performed. (Frozen storage) may not be possible. By setting the trigger activation condition, data recording is performed only in a necessary system phenomenon, so that data recording can be performed reliably, and highly accurate system analysis can be performed.

[Fourth Embodiment]
FIG. 11 is an explanatory diagram schematically showing a trigger output setting unit in the fourth embodiment of the power system measurement system according to the present invention. In this embodiment, it is possible to set whether or not to output a signal of trigger signal type 1 to trigger signal type n.

  When it is desired to output a trigger signal to the electric station measurement terminal device B in the trigger signal type 1, the contact of the corresponding variable setting unit is turned ON. When the trigger signal is not output, the contact of the variable setting unit is turned off.

When triggered command output to all of the measuring terminal apparatus, since the data collection unnecessary electric station or et al. Also record data is sent, so that the collecting large amounts of data. In this embodiment, by setting whether or not data collection is necessary according to the trigger signal type, only necessary data is collected, and efficient data analysis is possible.

[Fifth Embodiment]
FIG. 12 is a system diagram showing the configuration of the fifth embodiment of the power system measurement system according to the present invention. FIG. 13 is an explanatory diagram schematically showing a module configuration of each electric station measurement terminal device in the fifth embodiment. FIG. 14 is a flowchart showing the flow of data recording of the grid electricity quantity in the fifth embodiment.

  In this embodiment, the electric station measurement terminal devices are installed from the A electric power station to the N electric power station, and these are connected via the communication network 20. A data recording device 7 is installed in the communication network 20.

Data recording device 7, a trigger command input unit 6, the sequence processing unit 3, the trigger command output section 5, the system activation condition detecting section 2 for detecting a change in the integrated state, determines the sequence processor record data type based on the activation condition 3. A recording database 8 for recording measurement data transmitted from the measurement terminal device and a trigger command output unit 5 are provided.

  In FIG. 14, when a system failure occurs (step S21), the failure detection relay operates in the measurement terminal device 1 at the electric power station A (step S22). Using this as a trigger activation signal, the system electricity quantity in several cycles before and after the system failure occurs is recorded (freeze-stored) (step S23). Moreover, the measurement terminal device 1 of A electric station adds the system failure occurrence time to the trigger activation signal and transmits it to the data recording device 7 (step S24). The data recording device 7 that has received the trigger activation signal performs determination processing in the sequence processing unit 3 (step S25), and outputs a trigger command to the other measurement terminal device group 9 or the measurement terminal device group 10 (step S25). S26). The measurement terminal device group 9 or the measurement terminal device group 10 that has received the trigger command records (freezes and stores) the grid electricity amount (step S27).

  According to this embodiment, when it is desired to change the setting of the trigger command output destination, the trigger instruction output destination is set in the data recording device. . For this reason, setting change is possible in a short time compared with the case where a setting change is needed in all the electric station measurement terminal devices like 1st Embodiment.

[Sixth Embodiment]
FIG. 15 is an explanatory view schematically showing the module configuration of each electric station measurement terminal device in the sixth embodiment of the power system measurement system according to the present invention. FIG. 16 is a trigger signal output range setting table in the sixth embodiment.

  The electric station measurement terminal devices 1 installed in each of the A electric power station to the N electric power station are connected to each other via a communication network 20. A data recording device 7 is installed in the communication network 20. A power station computer (PC) 11 is installed as a medium for changing the setting.

  As shown in FIG. 16, “1” is written in the settling table when the trigger command output is performed from the electric station measuring terminal device, and “0” is written when the command output is not performed. By performing a writing operation on this settling table from a remote place, it is possible to rewrite the settling of each electric station measuring terminal device.

  According to this embodiment, it is possible to collectively change the settings for all the electric power station measuring terminal devices across a plurality of electric power stations by an operation from the power station computer 11. Since it is possible to change the setting from a remote location without going to the site, it is possible to save time.

1: Measurement terminal device 2: Start condition detection unit 3: Sequence processing unit 4: Record data unit 5: Trigger command output unit 6: Trigger command input unit 7: Data recording device 8: Record database 11: Power station computer 15: Protection Relay 20: Communication network

Claims (7)

A power system measurement system comprising a plurality of measurement terminal devices installed at a plurality of electrical stations and connected to each other via a communication network,
Each of the plurality of measurement terminal devices
Detection means for detecting information including at least the voltage and current of the power system as a status signal;
A state signal holding unit that holds the state signal detected by the detection unit for a predetermined period, and sequentially overwrites the state signal with a newly detected state signal after a predetermined period after the state signal is detected;
Distribution means for distributing the trigger signal and a signal related to the time of the trigger signal to other measurement terminal devices via the communication network using a part of the state signal detected by the detection means as a trigger signal;
Of the status signals held in the status signal holding means, the trigger signal detected by the measurement terminal device or the status signal for a predetermined period before and after the trigger signal delivered by the delivery means is stored frozen. Freezing storage means,
Depending on the type of the trigger signal detected by the detection means of the measurement terminal device or distributed from another measurement terminal device, the trigger signal and a signal related to the time of the trigger signal are sent to other measurement terminals. Distribution determination means for determining where to distribute the device;
I have a,
The distribution means distributes the trigger signal and a signal related to the time of the trigger signal only to the measurement terminal device determined to be distributed by the distribution determination means;
Power system measurement system characterized by Whether each of the plurality of measurement terminal devices distributes the trigger signal and a signal related to the time of the trigger signal to each of the other plurality of measurement terminal devices according to the type of the trigger signal is determined by a distribution determination unit. The power system measurement system according to claim 1, further comprising determination setting means for setting a determination criterion for determination . Each of the plurality of measurement terminal devices has a predetermined period of time before and after the trigger signal by the cryopreservation unit of the measurement terminal device according to the type of the trigger signal distributed by the distribution unit of another measurement terminal device. Having a storage determination means for determining whether or not to store the status signal in a frozen state;
The cryopreservation means cryopreserves a state signal of a predetermined period before and after the trigger signal only for the trigger signal determined to be cryopreserved by the storage determination means,
The power system measurement system according to claim 1 or 2, wherein Further comprising a power station computer connected to the plurality of measurement terminal devices via the communication network,
The power station computer distributes the trigger signal detected by the detection means of the measurement terminal device and the signal related to the time of the trigger signal from the trigger transmission means to any measurement terminal device other than the measurement terminal device. Having setting means for setting
The power system measurement system according to any one of claims 1 to 3, wherein: A power system measurement system comprising a plurality of measurement terminal devices installed in a plurality of electrical stations and connected to each other via a communication network and at least one data recording device,
Each of the plurality of measurement terminal devices
Detection means for detecting information including at least the voltage and current of the power system as a status signal;
A state signal holding unit that holds the state signal detected by the detection unit for a predetermined period, and sequentially overwrites the state signal with a newly detected state signal after a predetermined period after the state signal is detected;
Trigger transmission means for transmitting a part of the status signal detected by the detection means as a trigger signal to the data recording device via the communication network and the signal related to the time of the trigger signal;
First trigger receiving means for receiving a trigger signal and a signal related to the time of the trigger signal from the data recording device via the communication network;
Of the status signals held in the status signal holding means, the trigger signal detected by the measurement terminal device or the status signal for a predetermined period before and after the trigger signal received by the first trigger reception. Data transmitting means for transmitting to the data recording device via the communication network;
Cryopreservation means for cryopreserving the status signal transmitted from the data recording device;
Have
The data recording device comprises:
Second trigger signal receiving means for receiving the trigger signal transmitted by the trigger transmitting means of the plurality of measurement terminal devices and a signal related to the time of the trigger signal;
In accordance with the type of the trigger signal received by the second trigger signal receiving means, the trigger signal and a signal related to the time of the trigger signal are set to a plurality of signals other than the original measurement terminal device from which the trigger signal was transmitted. Distribution determination means for determining where to distribute the measurement terminal device; and
Trigger signal distribution means for distributing the trigger signal received by the second trigger signal reception means and a signal related to the time of the trigger signal to the measurement terminal device determined to be distributed by the distribution determination means;
A power system measurement system characterized by comprising: Further comprising a power station computer connected to the plurality of measurement terminal devices via the communication network,
The power station calculator transmits the trigger signal detected by the detection means of the measurement terminal device and the signal related to the time of the trigger signal to any measurement terminal device other than the measurement terminal device from the trigger transmission means. Having setting means for setting whether to distribute via a data recording device;
The power system measurement system according to claim 5, wherein: The status signal includes an on / off control command signal from the protection device of the power system to the circuit breaker, a state of the pallet of the circuit breaker of the power system, a tap value of the transformer of the power system, and a tap switching elevation control of the power system. The power system measurement system according to any one of claims 1 to 6, comprising any one or more of command signals .

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