JP2003032914A - Automation system of power distribution, and monitoring method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automation system of power distribution and a monitoring method thereof, capable of collecting synchronized measured data from a plurality of slave stations, even in normal communication lines. SOLUTION: This automation system of power distribution collects monitoring data from the plurality of slave stations 5 via a network 7 and monitors a distribution line 3, where a monitoring and controlling terminal 8, which generates data storage command 11 to store higher harmonics measured data to all of the slave stations 5 at the same time (t1), in the event of a instantaneous ground short-circuit accident, and all of the slave stations 5 store the measured data by making measurements. Subsequently, the monitor and control terminal 8 sends stored data sending back commands 12, 14, 16, to send the stored measured data back thereto sequentially (t2, t3, t4) to the respective slave stations 5, and the respective slave stations 5 send the stored measured data back thereto sequentially (t2', t3', t4'). Thus, the monitor and control terminal 8 acquires highly synchronized (t1) measured data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution automation system for automatically monitoring and controlling a distribution line and a slave station monitoring method in such a system, and in particular, enables collection of slave station data at the same time. The present invention relates to a distribution automation system and a monitoring method in such a system.

[0002]

2. Description of the Related Art An automatic distribution system is used in a distribution line, for example, in a switch unit which is a section of the line.
Multiple slave stations are installed, and based on the measurement values monitored by these slave stations, the supervisory control terminal, which is a higher-level device,
The condition of the distribution line is automatically monitored (for example, by confirming that there is no power failure section), and a large number of complicated distribution lines are installed on the distribution line to control the opening and closing of the switch.

By the way, in the conventional distribution automation system, as a monitoring function, a method in which a supervisory control terminal which is a higher-level device monitors each slave station, that is, one by one, is generally adopted. It had been. Therefore, in the conventional distribution automation system described above, when the supervisory control terminal, which is a higher-level device, monitors a plurality of slave stations, a time lag occurs until it monitors all the slave stations on the distribution line, which is The data collected from each slave station to the supervisory control terminal was a database with a low time synchronization.

On the other hand, it is possible to detect a ground fault in a power distribution line by measuring a high frequency component of current or voltage, for example, as disclosed in Japanese Patent Laid-Open Nos. 11-38073 and 5-22851. Are known. Further, for example, as disclosed in Japanese Patent Laid-Open Nos. 6-78454 and 6-174777, in order to locate a faulty section in the power system, the detection timing of the slave station that detects the state quantity of the electric line is detected. Are known to need to match. In addition, JP-A-4-47899
According to the publication, in a remote monitoring system including a plurality of slave stations (monitored station devices) and a plurality of monitoring station devices connected via a communication line, the monitoring station device includes a plurality of monitored station devices. To send information transmission request signals to
It is known to collect necessary monitoring information from monitored station devices.

In particular, regarding the above harmonic measurement, since the harmonics vary from moment to moment, at the same time, at a plurality of distribution line points (slave station units in the distribution automation system). It is desirable to measure harmonics. The measurement of such harmonics at the same time is especially important when utilized for searching the source of such harmonics. However, as described above, the conventional distribution line automation system that is currently adopted, in particular,
For system components that do not have a clock function,
Currently, the supervisory control terminal, which is a higher-level device, does not have a high-speed communication facility for communicating with a slave station, that is, a communication speed that is high enough to collect data measured from multiple slave stations at the same time. there were.

To solve the problem of the same time in the prior art, for example, an optical cable capable of high-speed communication is used as a communication line between each slave station and the supervisory control terminal, There has been proposed a method of polling each one of the above.

However, the method of polling between each slave station and the supervisory control terminal at high speed with a high-speed optical cable as described above is applicable to various devices arranged in each slave station. High-speed response is required, and the optical cable network to be laid also has technical problems such as attenuation of light, and also has a problem that its price becomes expensive. Therefore, such a proposal has not been a practical solution, especially in a distribution automation system that mainly controls opening / closing of a plurality of partition switches that are installed in a complicated manner on a distribution line.

[0008]

As described above, in the conventional distribution automation system, in particular, in the distribution automation system for managing a plurality of slave stations having a function of detecting a ground fault short-circuit accident of a distribution line, Although it is required that the slave stations measure the harmonics in the distribution line at the same time, it is difficult to realize such a requirement through the conventional communication network.

In particular, when the supervisory control terminal, which is a higher-level device, wants to collect measurement data with high time synchronization from a plurality (a large number) of slave stations via a conventional communication network, Although it is unavoidable to shorten the communication data by shortening the measurement data to be returned, this requires the minimum measurement data length, which makes it impossible to obtain the necessary highly accurate measurement data. On the other hand, the more highly accurate the measurement of the state quantity in the distribution line, the longer the measurement data and the longer the communication time. In this case, the first purpose is to confirm that there is no simultaneous time of the measurement data obtained by the supervisory control terminal, or that there is no power outage. In the distribution automation system whose main purpose is to monitor, it may be impossible to achieve its original function.

In view of the above problems in the prior art, therefore, the present invention does not require the installation of expensive equipment such as the above-described method of polling at high speed with an optical cable, and the conventional general method. By using a communication network, it is possible to collect measurement data of higher co-simultaneity from a plurality of slave stations in high-frequency measurement, etc., and thus have an excellent distribution automation system and monitoring in such a system. The purpose is to provide a method.

[0011]

In order to achieve the above object, the present invention proposes that a plurality of slave stations installed on a distribution line are connected to the slave stations via a network. In a distribution automation system that includes a monitoring control terminal that collects monitoring data from the slave station and monitors the distribution line, the monitoring control terminal measures the state quantity in the distribution line and stores the measurement data. Means for simultaneously generating a data storage command having the content to all of the connected slave stations, and a stored data reply command having the content to return the stored measurement data to each of the slave stations. All the slave stations connected to the supervisory control terminal, and each of the slave stations connected to the supervisory control terminal individually stores the data stored therein. In response to the command, a means for measuring the state quantity and storing the measurement data, and a response to the measurement data reply command issued to the self from the monitoring control terminal, the state quantity stored in the storage means The distribution automation system is provided with a means for returning measurement data.

Further, according to the present invention, in the above distribution automation system, the state quantity measured in the distribution line is a harmonic on the distribution line, and the data storage command generating means of the monitoring control terminal. Generates a command for measuring harmonics on the power distribution line to all of the slave stations and storing the measured data, and the plurality of slave stations respectively include the distribution line. A means for measuring harmonics on the road is provided.

In addition, again, in order to achieve the above object, it is proposed by the present invention that a plurality of slave stations installed on a distribution line and the slave stations connected via a network are connected to the slave stations. A monitoring method in a distribution automation system comprising a monitoring control terminal that collects monitoring data from a station and monitors the distribution line, wherein the monitoring control terminal measures a state quantity in the distribution line to obtain measurement data. A data storage command having the content of storing is simultaneously issued to all of the connected slave stations, and all slave stations connected to the supervisory control terminal are directed to themselves from the supervisory control terminal. Storage in which the state quantity is measured and the measured data is stored in response to each of the generated data storage commands, and the monitor control terminal returns the stored measured data. Data response command is sequentially generated for each of the slave stations, and the slave stations connected to the monitor control terminal respectively respond to the measurement data reply command generated from the monitor control terminal. On the other hand, it is a monitoring method in the distribution automation system in which the stored measurement data of the state quantity is returned so that the monitoring control terminal obtains measurement data with high time synchronization.

Further, according to the present invention, in the above-mentioned monitoring method, the state quantity measured in the distribution line is a harmonic on the distribution line, or the monitoring control terminal is When it occurs, a data storage command having the content of measuring the state quantity in the distribution line and storing the measurement data is simultaneously issued to all of the connected slave stations.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, FIG. 1 schematically shows a distribution automation system according to an embodiment of the present invention. In this figure, the distribution line to be monitored and controlled is, for example, a distribution transformer 1 or a distribution transformer 1. The distribution line busbar 2 and other equipment are provided, and a plurality of division switches 4, 4, ... For dividing the distribution line 3 are further provided. Then, the voltage and current of the distribution line are mainly checked to confirm that there is no power failure in each of the plurality of section switches 4, and to monitor the on / off state of the section switches. These section switches 4 together with the voltage / current sensor 6 for detection
Are provided for automatically controlling the so-called slave stations 5, 5, ... Although not shown, in order to provide these slave stations 5 with a function of searching for a generation source of harmonics and detecting a ground fault short-circuit accident of a distribution line, a harmonic of a distribution line or a ground short-circuit relay operation is performed. Various measuring devices for measuring the state and state quantities such as voltage and current of the fundamental wave are provided respectively, and each slave station 5 is composed of, for example, a microcomputer, and is not shown. However, a means (for example, a memory) for temporarily storing the measurement data, which is the state quantity measured by the measuring device, is provided.

Then, as equipment for automating the monitoring control by the distribution automation system having such a configuration, various measurement data are collected from the plurality of slave stations 5, 5, ... A supervisory control terminal 8 is provided as a higher-level device for controlling, and is composed of, for example, a computer. As shown in the figure, the plurality of slave stations 5, 5, ... Are assigned their address numbers (for example, "00").
1 ”,“ 002 ”,“ 003 ”...), and further, these slave stations 5, 5 ...
Also, it is connected to the supervisory control terminal 8 as the above-mentioned upper device via a relay device 9 for relaying a signal.

In the distribution automation system having the above-mentioned configuration, for example, control and monitoring of the section switch 4 connected to the slave station 5 having the address "001", or the amount of electricity of the distribution line 3 in that section is measured. In this case, the monitor control terminal 8 sends a command to the slave stations 5, 5, ... Via the relay device 9 and the communication line 7. On the other hand, slave stations 5, 5 ...
On the side, the address data “00
1 ”to slave station 5 whose address number is“ 001 ”
In accordance with the above command, only performs the control monitoring operation or the operation of measuring the amount of electricity, which is its function, and then returns the execution measurement result (data). This is an outline of operation in a general distribution automation system.

In the distribution automation system of the present invention,
The supervisory control terminal 8 is, for example, in the case where a momentary short-to-ground fault occurs to the extent that the feeder breaker at the outlet of the distribution line does not trip, that is, a state in which the same time is required, such as harmonics of the distribution line. If you need quantity measurement data,
First, for all slave stations, a command whose content is to perform measurement of a desired state quantity and store the result,
That is, the data storage command is transmitted. After that, a command having the content of returning the data about the measured state quantity to the monitor control terminal, that is, a stored data reply command is sequentially transmitted. It should be noted that these operations are executed in accordance with, for example, software stored in advance in a storage (memory) device of a computer constituting the monitoring control terminal 8. As a result, all of the slave stations 5, 5, ... Which have received the data storage command and the stored data reply command.
Transmits the data having the same time to the monitor control terminal 8 as shown in the detailed contents of the operation below.
The monitor control terminal 8 can have a database with the same time.

FIG. 2 shows the distribution automation system of the present invention.
In particular, it is a flowchart showing the contents of processing in each slave station 5. It should be noted that these operations are executed in accordance with software or the like stored in advance in the storage (memory) device of the microcomputer that constitutes each slave station 5.

First, the command transmitted from the monitor control terminal 8 is received (process S101), and it is determined whether the command is the data storage command (process S10).
2). As a result, when it is determined that the command is a data storage command (“YES” in the figure), for example, the desired state quantity is measured by the various measuring devices provided in the slave station, and the measurement result is stored as measurement data. Then, the process ends (S103). That is, each slave station stores the latest (latest) current ground fault short-circuit accident detection data.

On the other hand, in the judgment in the step S102, it is judged that the command received from the supervisory control terminal 8 is other than the above data storage command ("NO" in the figure).
In this case, next, it is determined whether or not the command is a command transmitted to its own address (process S104). As a result, when it is determined that the instruction is not the instruction transmitted to its own address (“NO” in the figure), the processing is ended as it is. On the other hand, when it is determined that the command is the command transmitted to its own address (“YES” in the figure), it is further determined whether the content of the command is the above stored data reply command. Yes (Process S10
5).

As a result of the above determination (process S105), when it is determined that the stored data is a return command (“YES” in the figure), the stored data that has already been stored is returned to the monitoring control terminal (process). S106). On the other hand, when it is determined that the stored data return command is not received (“NO” in the figure), the result of the above determination (process S102) indicates that the data storage command has not already been received, and therefore the same time property is required. It is determined that this is related to the state quantity that is not satisfied. Therefore, in response to such a command, an operation according to the command (for example, opening / closing of a section switch and its monitoring control) is executed (process S107), and the execution result is monitored and controlled as in the conventional case. A reply is sent to the terminal (process S108), and the process ends.

Next, referring to FIG. 3 attached herewith, FIG. 1 and FIG.
The operation of the distribution automation system according to the present invention shown in FIG. In the figure, the slave station 5 including the voltage / current sensor 6 and the division switch 4 as described above is collectively referred to as a slave station 5 here for simplification of description. Shows.

In FIG. 3, in the distribution automation system for automatically monitoring and controlling the distribution line according to the present invention, it is desired to measure the harmonics of the distribution line (or the ground-short-circuit relay operating state and the voltage / current of the fundamental wave). Arbitrary time (time t in the figure)
In 1), the data storage command 11 is transmitted from the supervisory control terminal 8 which is a higher-level device. The data storage command 11 is simultaneously transmitted to all the slave stations (or a plurality of specific slave stations) 5, 5 ... Through the relay device 9, whereby each slave station 5 that has received the command. Measures and stores a desired amount in each section based on the command.

Thereafter, the supervisory control terminal 8 sequentially sends the stored data reply commands 12, 14, 16 ... To the slave stations at addresses "001", "002", "003" ... (Time t2). , T3, t4 ...). Then, the slave stations 5, 5 ... Receiving these stored data reply commands 12, 14, 16 ... Sequentially send the stored measurement data to the monitoring control terminal 8 (time t2 ′, t3 ′, t4 ′).
...) and replies 13, 15, 17 ...

As is apparent from this figure, the data storage command 11 is not a command directed to a specific slave station, but a command directed to all slave stations in one command. Therefore, all of the slave stations that have received the data storage command 11 have time t1.
In, the desired state quantity in each section is measured and the measured data is stored. That is, it means that the data of the same time is stored.

Thereafter, from the monitoring control terminal 8, the stored data reply command 12, sequentially (time t2, t3, t4 ...),
The slave stations 5, 5, ... Receiving 14, 16, ... Are current (highly synchronized), that is, harmonics measured at time t1 (or ground fault short circuit relay operating state and fundamental wave voltage / current). ) Measurement data sequentially (time t2 ', t3', t
4 '...), and reply to the monitor control terminal 8. After that, the supervisory control terminal 8 that has collected the desired measurement data from all the slave stations 5, 5 ... Creates a database of the information of each slave station 5, but the data for constructing this database is the same. It becomes time-sensitive.

The stored data reply commands 12, 1 sent from the supervisory control terminal 8 to the respective slave stations 5, 5 ...
As for 4 and 16, the necessary measurement data is already stored in the slave station, so the monitor control terminal 8 may transmit it anytime after that, for example, when the system is not using it, for example, when the arithmetic processing is idle. Transmission can be performed by using free time. Further, the supervisory control terminal 8 and all the slave stations 5, 5, ...
Since it is not necessary to concentrate communication between and with a specific time (see time t2, t3, t4 ... and time t2 ', t3', t4 '...), in the distribution automation system. In order to collect such measurement data with high time synchronization, it is possible to disperse the data in a fragmentary manner (transfer data) without concentrating the time and monopolizing the network 7. In other words, when monitoring a plurality of slave stations in a distribution automation system, if you want to obtain data with the same time, at a certain time, all slave stations are temporarily stored with the data, and the stored data can be stored later. By collecting the data, it is possible to inexpensively obtain the same-time data by using a communication network that is generally used conventionally.

Further, according to this, regardless of the data length (that is, even if the data length is long), the measurement data of the desired measurement amount required by the monitoring control terminal is not monopolized in the network. , It is possible to collect surely. Further, each slave station 5 can be avoided because it has a bad influence on the main operation of the slave station 5, such as switching on / off and monitoring of the division switch. In other words, the distribution automation system does not affect the transfer operation of the measurement data of state quantities such as harmonics that require the same time, and its basic operation is the electric quantity of the distribution line (fundamental voltage It becomes possible to surely execute collection and storage of data such as electric current, turning on and off of a section switch, and monitoring control thereof, and thus it is possible to provide a distribution automation system excellent in its basic performance.

[0031]

As is apparent from the above detailed description, according to the present invention, expensive conventional equipment such as a polling method using an optical cable is not required, and a conventional general communication network is used. It is possible to collect measurement data such as the amount of electricity (fundamental wave voltage / current) of the distribution line and also to measure harmonics with higher time synchronization from multiple slave stations. It is possible to provide a distribution automation system having excellent performance and a monitoring method in such a system, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a system block diagram showing an overall configuration of a distribution automation system according to an embodiment of the present invention.

FIG. 2 is a flow chart diagram for explaining processing contents in the above-described distribution automation system, particularly in each slave station.

FIG. 3 is an explanatory diagram illustrating operation timings of a supervisory control terminal and each slave station in the distribution automation system.

[Explanation of symbols]

3 distribution lines 4 switch 5 slave stations 6 Voltage / current sensor 7 communication lines (network) 8 supervisory control terminals 9 Relay device 11 Data storage command 12, 13, 14 Store data return command

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Claims (5)

[Claims] 1. A plurality of slave stations installed on a distribution line, and a supervisory control terminal that is connected to the slave station via a network and collects monitoring data from the slave station to monitor the distribution line. In the distribution automation system, the monitoring control terminal simultaneously generates a data storage command for measuring the state quantity in the distribution line and storing the measurement data to all of the connected slave stations. And a means for sequentially generating a stored data reply command having the content of returning stored measurement data to each of the slave stations, and being connected to the monitoring control terminal. All the slave stations respectively measure the state quantity and store measurement data in response to the data storage command generated from the supervisory control terminal, and the supervisory control. An automatic power distribution system comprising: means for returning the measurement data of the state quantity stored in the storage means in response to the measurement data reply command generated from the terminal. 2. A state quantity measured in the distribution line is a harmonic wave on the distribution line, and the data storage command generation means of the monitor control terminal is arranged on the distribution line for all of the slave stations. A command for generating harmonics on the road and storing the measured data is generated, and each of the plurality of slave stations is provided with means for measuring the harmonics on the distribution line. The distribution automation system according to claim 1. 3. A plurality of slave stations installed on a distribution line, and a supervisory control terminal connected to the slave station via a network and collecting monitoring data from the slave station to monitor the distribution line. A monitoring method in the distribution automation system, wherein the monitoring control terminal is a data storage command that stores the measurement data by measuring the state quantity in the distribution line, all of the connected slave stations. For all the slave stations connected to the monitor control terminal, in response to the data storage command generated from the monitor control terminal to itself, respectively, measure the state quantity. The monitoring control terminal stores measurement data, and the monitoring control terminal sequentially issues a stored data reply command having the content of returning the stored measurement data to each of the slave stations. Each of the slave stations connected to returns the measurement data of the stored state quantity in response to the measurement data reply command generated from the monitor control terminal to itself. A monitoring method in a distribution automation system, which is characterized by obtaining measurement data with high time synchronization. 4. The monitoring method in a distribution automation system according to claim 3, wherein the state quantity measured in the distribution line is a harmonic wave on the distribution line. 5. The data storage command, wherein the supervisory control terminal measures, when an instantaneous ground fault short-circuit accident occurs, the state quantity at which the accident is detected in the power distribution line and stores the measured data. Is simultaneously generated for all of the connected slave stations, the monitoring method in the distribution automation system according to claim 3.