JP3479709B2 - Data collection system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data collection system, and more particularly to wirelessly transmitting and receiving data relating to a power system between a master station and a plurality of slave stations distributed along the power system. The present invention relates to a data collection system suitable for use.

[0002]

2. Description of the Related Art Communication methods for exchanging power data between a master station and a plurality of slave stations in an electric power system are mainly communication methods using communication lines, power line carrier communication methods, and wireless communication methods. There is.

As a communication method using a communication line, there is known a method of performing digital communication using a coaxial cable or a dedicated line owned by a power company, which is composed of a composite overhead ground wire (optical fiber cable).

As a communication system by power line carrier, an example is known in which communication is performed between a sales office of a power distribution system and a switch slave station installed in the power distribution system.

On the other hand, the wireless communication system is used for collecting power transmission line information in mountainous areas where it is difficult to lay a communication line. In the case of this communication system, a fixed communication route set in advance is used. Therefore, relay communication is performed and power line information from a short distance to a long distance is collected in the base device.

[0006]

The communication system using a communication line requires a lot of time to install a coaxial cable, a composite overhead ground wire, etc., and is a priority communication. Therefore, the communication configuration cannot be changed by newly installing or relocating the communication device. Have difficulty. Furthermore, when the system configuration of the distribution system is changed due to a ground fault or the like, it is unavoidable to change the communication route according to the change of the system configuration, and further, communication becomes impossible when the communication line is broken.

On the other hand, the communication system using the power line carrier uses the power line as a communication line, and thus requires a coupling device with the power line, which makes it difficult to miniaturize the device. If the power line is broken, communication becomes impossible. Furthermore, the information must be transmitted according to the commercial frequency, and the communication speed is slower than that of the communication method using the communication line.

In the wireless communication system, the communication route for relay communication is fixed, so that the communication is functionally the same as the wired communication, and the communication becomes impossible due to the failure of the wireless device. Further, when the system configuration of the power transmission line is changed, it is necessary to reset the communication route for performing the relay communication, and moreover, it takes a lot of time to reset the communication route.

An object of the present invention is to provide a data collection system capable of flexibly coping with changes in communication paths due to changes in system configuration.

[0010]

In order to achieve the above object, the present invention provides a plurality of slave stations which are distributed along a system and which measure the state quantity of the system to generate system data.
A master station for collecting systematic data generated by each slave station, the master station serving as a search station, first search data transmitting means for transmitting search data within the wireless service area of the own station, and first search A first slave station recognizing means for recognizing a slave station which has transmitted the search response data as a communicable slave station when receiving the search response data in response to the search data transmitted by the data transmitting means, and a first slave station recognizing means. First communication path information creating means for creating communication path information regarding the communication path between the master station and each slave station based on the search response data from the slave station recognized by First search command means for outputting a search command to the station, and each slave station transmits search data as a search station to the station within the wireless service area of the own station. And the second Second slave station recognition means for recognizing the slave station that transmitted the search response data as a communicable slave station when the search response data in response to the search data transmitted by the search data transmission means is received, and the search data for other stations When a message is received, the search response data including the identification data unique to the own station is transmitted to the search station, and the search response data from the slave station recognized by the second slave station recognition means is transmitted to the search station. A data collection system having a data transmission means is configured.

In constructing the data collection system, the master station sets a slave station other than the slave station recognized by the first slave station recognition means as a destination station, and a relay station for this destination station as the first communication path information creation. Relay station selecting means for selecting from the slave stations recognized by the first slave station recognizing means according to the communication path information created by the means, or a slave station other than the slave station recognized by the first slave station recognizing means, the destination station From among the slave stations recognized by the first slave station recognizing means according to the number of relays between the stations or the distance between the stations among the communication path information created by the first communication path creating means, A relay station selecting means for selecting may be provided. Further, as the first communication path information creating means, the first
It is possible to provide a function of creating communication route information about a relay route including the number of relays between each station and the distance between each station based on the search response data from the slave station recognized by the slave station recognizing means. The command means can be configured to have a function of outputting a search command to the slave station recognized by the first slave station recognition means and the relay station selected by the relay station selection means.

On the other hand, the search command relay means for relaying the search command from the search station to each slave station and transmitting it to the slave station recognized by the second slave station recognition means and the second slave station recognition means are recognized. Second search command means for outputting a search command to the slave station may be provided. Further, as the search response data transmitting means, when the search data of another station is received, the search response data including the identification data unique to the own station and the position data is transmitted to the search station and the child recognized by the second slave station recognizing means. The search response data from the station can be transmitted to the search station.

When configuring each data collection system, the following elements can be added.

Each slave station detects failure of the slave station by communicating with the communicable slave station, and failure information transmission for transmitting failure information detected by the failure detecting means to another communicable station. The master station has a communication path information updating means for updating the communication path information created by the first communication path information creating means in accordance with the failure information from the slave station.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a data collection system showing an embodiment of the present invention. In FIG. 1, the distribution substation 20 includes a plurality of distribution lines 70 that form an electric power system,
71 and 72 are connected, and loads 50a to 50d are connected to the respective distribution lines 70 to 72. And each load 5
0a to 50d from the distribution substation 20 to distribution lines 70 to 72
Power is supplied via. The master station 21 is a communication line 60
Is connected to a central office 11 installed in a business office 10 that monitors and controls the electric power system. In addition, in the vicinity of the loads 50a to 50d of the distribution lines 70 to 72, the slave stations 40a to
40d are arranged dispersedly. Each slave station 40a-40
d is connected to the sensors 30a to 30d attached to the distribution lines 70 to 72, respectively. Child stations 40a-40
d is installed in, for example, the distribution lines 70 to 72 itself or a utility pole, and system data is wirelessly communicated with the master station 21 or other slave stations,
For example, it is configured to exchange data regarding voltage and current of a distribution line. That is, each sensor 30a-
30d measures voltage, current, etc. in the distribution lines 70 to 72 and outputs the measured values to the respective slave stations 40a to 40d.
System data is generated based on the measurement values measured in a to 30d, and the generated system data is wirelessly transmitted to the master station 21 or another slave station.

The master station 21 first recognizes the communication route (communication route) between the master station 21 and each slave station when generating the system data generated by each slave station. When the search data is transmitted to the wireless service area of the device and the search response data in response to the search data is received, the slave station that transmitted the search response data is recognized as a communicable slave station, and the recognized slave station is recognized. It has a function to create communication route information about the communication route including the number of relays between each station and the distance between each station based on the search response data from Select the slave station as the destination station, and select the relay station and communication route information for this destination station according to the number of relays between each station or the distance between the stations, and as a slave station and relay station recognized as a communicable slave station. Selected And a function of outputting a search command to the slave station.

Specifically, as shown in FIG. 2, the master station 21 includes a wireless communication unit 22, an antenna 23, and a terminal device 24, and the terminal device 24 includes a control unit 25, a storage unit 26, and a storage unit 26.
It is composed of a communication path table creation unit 27. The search data is transmitted by the wireless communication unit 22 and the antenna 23, and the search response data is received. Based on the received search response data, a communication route table is used as communication route information regarding a communication route. It is created by the creating unit 27. Then, the communication route table creation unit 2
The information about the communication route table created in 7 is stored in the storage unit 26. The storage unit 26 stores the address and coordinates of the master station 21.

On the other hand, each of the slave stations 40a-40d transmits search data as a search station within its own wireless service area in response to a search command, and when it receives search response data in response to this search data, the search response is received. Recognizing the slave station that sent the data as a communicable slave station, and receiving the search data of another station, the identification data unique to your station (address of your station)
It has a function of transmitting search response data including position data (coordinates) to the search station and transmitting search response data from the slave station recognized as a communicable slave station to the search station.

Specifically, as shown in FIG. 3, each of the slave stations 40a-40d includes a measuring section 41, a storage section 42, a controller 43, a wireless communication section 44, and an antenna 45.
The measuring unit 41 is connected to each of the sensors 30a to 30d. When the measured values related to the voltage and current measured by each of the sensors 30a to 30d are input to the measurement unit 41, system data is generated based on the measured values. This system data is stored in the storage unit 42 and is transmitted via the wireless communication unit 44 and the antenna 45 in accordance with a command from the controller 43. Further, the search data is transmitted from the antenna 45 via the wireless communication unit 44. The search response data and the data related to the communication route table are received by the wireless communication unit 44 via the antenna 45, and each received data is stored in the storage unit 4.
Stored in 2. In this storage unit 42, the address of the own station and the coordinates as the position data are stored as identification data unique to the own station.

Next, the function of searching the communication route of the power data collection system and creating the communication route table when the system is newly installed will be described with reference to FIGS. 4 to 7.

In the power data collection system shown in FIG. 4, the master station 21, slave stations 40a, 40b, 40d are arranged in the jurisdiction 801 of the business office 10, and the wireless service area of the master station 21 (wireless communication is possible). Range) 802, the slave stations 40a, 40d are arranged, and the master station 21, the slave station 40a
Addresses A to E and coordinates are set in ˜40d when the station is installed. As shown in FIG. 5, the number of relays between the sending station and the destination station is recorded in the communication path table of the master station 21, and direct communication is possible between stations whose relay count is "1". It means that. The station registered in the communication path table can communicate with the master station 21. Further, in the coordinate table of the master station 21, as shown in FIG. 6, the coordinates of the place where each station is installed are recorded. In each table, "-" represents indefinite.

Next, when the master station 21 creates the communication route table, the communication route is searched. Less than,
A specific procedure will be described according to the flowchart of FIG. First, the master station 21 selects a station (hereinafter, referred to as a search station) for searching a communication route (step S).
10). As the search station, a station that has not been searched among the stations registered in the communication path table (a station that has not been selected as a search station) is selected. However, in the data collection system for electric power, in order to collect the system data in the jurisdiction area 801, the jurisdiction area 801 of the sales office 10
Do not select a slave station that is out of the list as a search station. For this reason,
In the initial state, since only the master station 21 is registered in the communication route table and the coordinate table, the communication route table and the coordinate table are as shown in FIGS. 5A and 6A. Therefore, at this time, the master station 21 selects itself as the search station.

Next, the master station 21, as a search station, performs a search by broadcast transmission (step S11). That is, the master station 21 transmits a search packet (search data) by broadcast communication (communication method of transmitting the communication path sent to the communication processing node to a plurality of terminals), and the wireless service area 802 of the master station 21 is transmitted. Search for slave stations installed in. At this time, the slave station 4 installed in the wireless service area 801
When 0a and 4d receive the search packet, each slave station 40a and 40d sends a search response packet (search) to the master station 21 that is the station that transmitted the search packet as data including the address and coordinates of each slave station. Response data) is returned (step S12).

Upon receiving the search response packet from the slave stations 40a and 40d, the master station 21 recognizes the slave stations 40a and 40d as the communicable slave stations, and the communication route table and the coordinate table are shown in FIG. It is updated as shown in FIG. 6B (step S1). When the search response packet is not returned, the master station 21 recognizes itself as the slave station at the end of the communication route, and performs the same processing with the result as the search response packet.

The updated communication path table is stored in the master station 21.
Since direct communication is possible between the slave stations 40a and 40d,
The number of relays is "1", and since the communication between the slave stations 40a and 40d is possible via the master station 20, the number of relays is "2".
Becomes Further, the coordinates of the newly recognized slave stations 40a and 40d are registered in the coordinate table. Then, the updated information on the communication path table and the coordinate table is transmitted to the communicable slave stations 40a and 40d (step S).
14). Then, the slave stations 40a and 40d which have received the information about the communication route table and the coordinate table update the contents of the communication route table and the coordinate table of their own stations in the same manner as the master station 21 (step S15). As a result, the master station 21,
The slave stations 40a and 40d can communicate with each other. Master station 21
After completing the search for the communication route in the wireless service area 801 of its own station, another communication route is continuously searched for in order to create the communication route table. in this case,
From the stations registered in the communication path table, any one of the slave stations 40a and 40d that are not the search station is selected as the search station. For example, the master station 21
The slave station 40a is selected as a search station (step S20). As a result, the master station 21 transmits a search instruction packet to the slave station 40a in order to cause the slave station 40a to search (step S21).

Slave station 40a which received the search instruction packet
As shown in FIG. 8, the search packet is transmitted by the broadcast communication to search for the slave station installed in the service area 803 (step S22). At this time, when the slave station 40b installed in the service area 803 receives the search packet, the slave station 40b sends the address of its own station to the search station (in this case, the slave station 40a) that has transmitted the search packet. A search response packet is returned as data including coordinates (step S23).

Upon receiving the search response packet from the slave station 40b, the slave station 40a recognizes the slave station 40b as a communicable slave station, and uses this search result as data to send a response packet (search response data) to the search instruction packet. It returns to the master station 21 (step S22). Upon receiving the response packet to the search instruction packet from the slave station 40a, the master station 21 recognizes the slave station 40b as a communicable slave station, and the communication route table and the coordinate table are shown in FIG. 5 (c) and FIG. 6 (c), respectively. )
(Step S24).

In the updated communication path table, since the slave station 40b and the slave station 40a can directly communicate with each other, the number of relays between these stations is "1", and between the slave station 40b and the master station 21 is the slave station 40a. Since the number of relays between these stations is “2”, the number of relays between these stations is “2” and between the slave stations 40b and 40d can be communicated via the slave station 40a and the master station 20. Becomes "3". Also, in the coordinate table,
The coordinates of the newly recognized child station 40b are registered. The updated communication path table and coordinate table are respectively transmitted to the slave stations 40a, 40b, 40d which have become communicable (step S25). Then, the slave stations 40a, 40 that have received the information about the communication path table and the coordinate table
b and 40d update the communication route table and the coordinate table in the same manner as the master station 21 (step S26). As a result, the master station 21 and the slave stations 40a, 40b, 40d can communicate with each other.

Similarly to the processing of steps S20 to S26, the master station 21 continuously searches for a communication route and selects a slave station installed in the jurisdiction 801 of the business office 10. Considering that the slave station selected as the search station and the master station 21 may not be able to directly communicate with each other even if the communication route is repeatedly searched, in the present embodiment,
By selecting the relay station and relaying the packet, the communication route is searched between the stations that the master station 21 cannot directly communicate with. Hereinafter, a procedure for searching a communication route for relaying will be described with reference to FIGS. 9, 10 and 11. The master station 21, the slave stations 40a, 40b, 40
It is assumed that the communication route table and the coordinate table of d are registered as shown in FIGS. 5C and 6C, respectively.

First, the master station 21 performs steps S10 and S2.
The slave station 40b is selected as the search station by the same procedure as 0 (step S30). Next, the master station 21 transmits a search instruction packet to the slave station 40a in order to cause the slave station 40a to search. However, in this case, the master station 21 and the slave station 40b
Cannot communicate directly (relay count> 1), select a relay station and send a search instruction packet (step S3).
1).

Here, the procedure for selecting a relay station will be described with reference to the flowchart of FIG.

Basically, the station having the smallest number of relays and the shortest communication distance is selected as the relay station. First, the number of relays to the destination station is obtained from the communication path table among the stations (relay count = 1) that can directly communicate with the own station (step S40). The stations that can directly communicate with the master station 21 that is the local station are the slave station 40a and the slave station 40d, and the number of relays from these stations to the slave station 40b that is the destination station is one and three times, respectively.

Next, it is determined whether or not there are a plurality of child stations having the smallest number of relays obtained in step S40 (step S41). The slave station with the smallest number of relays is only the slave station 40a1. Therefore, when there is one slave station with the smallest number of relays, the slave station with the smallest number of relays obtained in step S40 is selected as the relay station (step S42). Therefore, in this case, the slave station 40a is selected as the relay station.

In this example, the slave station with the smallest number of relays is 1
Since it is a station, a relay station was selected in the procedure of steps S40 to S42, but if there are two or more slave stations having the smallest number of relays, the procedure of steps S43 to S44 is executed to select the relay station. select.

For example, when there are two or more slave stations having the smallest number of relays, the communication distance to the self station among the slave stations having the smallest number of relays obtained in step S40 is determined based on the coordinates of the communication table. Obtained (step S43). Then, the slave station with the shortest communication distance is selected as the relay station. However, when there are two or more slave stations having the shortest communication distance, any one of the stations is selected as the relay station (step S44).
Through the above procedure, the relay station can be selected using the communication route table and the coordinate table. After selecting the relay station, the procedure returns to step S31. Here, the master station 21 selects the slave station 40a as a relay station and transmits a search instruction packet to the slave station 40b. Master station 2 at this time
The slave station 40a that has received the packet from
Since the packet can be directly communicated with, the packet is relayed to the child station 40b (step S32). The slave station 40b is the slave station 40
The packet from the master station 21 relayed by a is received (step S33). Further, the slave station 40b that has received the search instruction packet transmits the search packet by the same procedure as steps S11 and S22, and sends the service area 804.
Search for slave stations installed inside (step S3)
3).

A slave station 40c is installed in the service area 804 of the slave station 40b. When the slave station 40c receives a search packet, the slave station 40c sends the search packet to the slave station 40b. A search response packet is returned using the address and coordinates of the own station as data (step S
34).

Upon receiving the search response packet from the slave station 40c, the slave station 40b recognizes the slave station 40c as a communicable slave station and returns a response packet to the search instruction packet to the master station 21 using the search result as data. To do. Further child station 4
0c is obtained by the same procedure as steps S40 to S44.
The slave station 40a is selected as a relay station and a response packet to the search instruction packet is transmitted to the master station 21 (step S3).
3). Then, the mobile station 40a, which has received the response packet to the search instruction packet from the mobile station 40b, operates in step S3.
A response packet to the search instruction packet is transmitted to the master station 21 by the same procedure as in 2 (step S35). Then, the master station 21, which has received the response packet to the search instruction packet from the slave station 40a, recognizes the slave station 40c as a communicable slave station, and uses the communication path table and the coordinate table as shown in FIG. Update as shown in d) (step S36).

Since the slave stations 40c and 40b can communicate directly with each other in the updated communication path table, the number of relays between these stations is "1", and the slave stations 40c and 40a.
Since the communication can be performed via the slave station 40b, the number of relays between these stations is “2”, and the communication between the slave station 40c and the master station 21 can be performed via the slave station 40b and the slave station 40a. The number of relays between stations is "3", and since the communication between the slave station 40c and the slave station 40d is possible via the slave station 40b, the slave station a, and the master station 21, the number of relays between these stations is "4". Become. Further, the coordinates of the newly recognized slave station 40c are registered in the coordinate table. The updated contents of the communication path table and the coordinate table are the contents of the slave stations 40a, 40
b, 40d, 40e respectively (step S
37). The slave stations 40a, 40b, 40c, 40d that have received the communication route table and the coordinate table update the contents of the communication route table and the coordinate table in the same manner as the master station (step S38). Thereby, the master station 21 and the slave station 40
a, 40b, 40c, and 40d can communicate with each other.

The master station 21 performs steps S20 to S26, S
Similar to 30 to S38, the communication route is continuously searched, and all the slave stations installed in the jurisdiction area 801 of the business office 10 are searched.

By executing the above processing, in the power data collection system of this embodiment, when the system is newly installed, the master station 21 and the slave stations 40a, 40b,
The communication routes regarding 40c and 40d can be recognized (re-recognized).

In the power data collection system of this embodiment, the master station cannot directly communicate by selecting the relay station according to the procedure of steps S40 to S44 and relaying the packet through the selected relay station. Communication between stations is possible. Therefore, using the procedure described above, each of the slave stations 40a to 40 in the system is transmitted from the master station 21.
By requesting the system data to d and sending the system data from each of the slave stations 40a to 40d to the master station 21, each slave station 40
The system data measured by a to 40d can be collected in the master station 21.

The function of this embodiment recognizes the communication route of the power data collection system not only when the system is newly installed, but also when the system configuration is changed due to the relocation or extension of slave stations in the system. Since it can be (re-recognized), it is possible to flexibly deal with the change of the communication route due to the change of the system configuration and the system configuration. Further, the functions in this embodiment are programmed in the terminal device in the master station 21 and the controller in the slave station, and the system administrator resets the coordinates in the newly installed or relocated / expanded slave station, By executing the function of recognizing the communication route of the station 21, it is possible to automatically recognize the communication route, it is not necessary to perform complicated work, and the time and labor required for resuming the communication can be significantly reduced.

Further, as shown in FIG. 12 and FIG.
A GPS receiver 28 and a GPS antenna 29 are installed in the master station 21, a GPS receiver 46 and a GPS antenna 47 are installed in the slave station, and positioning is performed based on the reception data received by the GPS receivers 28 and 46. The coordinates can be set by executing it. In this case, it is not necessary for the worker to set the coordinates when the device is installed (reinstalled), which simplifies the maintenance of the device and reduces the labor of the worker.

Next, another embodiment of the present invention will be described with reference to FIGS.

In this embodiment, a function for detecting a station failure is added to the power data collection system, a station failure is detected, and a communication route of the power data collection system is recognized again to create a bypass route. This enables communication even if a station failure occurs. FIG. 14 shows the configuration of the power data collection system, FIG. 15 shows a communication route table, and FIG. 16 shows a coordinate table. Further, a flowchart is shown in FIGS. 17 and 18.

First, a specific procedure for detecting a station failure due to a communication error will be described with reference to the flowchart of FIG. First, the transmitting station (hereinafter, T station) transmits a packet to the receiving station (hereinafter, R station) (step S70). The R station which receives the packet transmits a response packet to the T station (step S75). After the T station sends the packet,
Waits for a response packet from the R station for a fixed time (step S7)
1 to S73). Then, when the response packet from the R station can be normally received within the fixed time, it is determined that the communication is successful, and the process is ended (step S73).

On the other hand, if the response packet cannot be received within a certain time due to an error such as a communication error, it is determined that the communication has failed, and the transmission process (retransmission) is performed (step S7).
4). When the number of retransmissions exceeds a certain number, the R station is determined to be in failure and the content of the failure is notified to the master station 21. This allows the power data system to detect a station failure due to a communication error.

Next, a specific procedure after detecting the station failure will be described with reference to the flowchart of FIG.

First, when the slave station 40a is normal, the communication path table and the coordinate table are as shown in FIGS. Then, in order to transmit the system data to the master station 21, the slave station 40b selects the slave station 40a as the relay station by the procedure described above and transmits the system data (step S60). However, since the slave station 40a is out of order,
The slave station 40b uses the procedure for detecting the station failure described above,
It is detected that the slave station 40a is out of order (step S
61).

Slave station 40b which has detected a failure of the slave station 40a
Relays according to the above-described relaying procedure, and transmits information indicating that the slave station 40a is out of order to the master station 21 (steps S62 to S64).

Upon receiving the information that the slave station 40a is out of order, the master station 21 re-recognizes the communication route by the function of searching the communication route and creating the communication route table (step S65). In this case, the communication route table is updated as shown in FIG. Then, the updated contents of the communication path table are transmitted to the communicable slave stations, and the communication path table of each slave station is updated similarly to the master station 21.

As a result, the master station 2 excluding the slave station 40a
1, the slave stations 40b, 40c, 40d can communicate. In addition, the slave station 40 is updated by the updated communication path table.
b can transmit the system data to the master station 21 (steps S66 to S69).

By the above procedure, the power data collection system re-recognizes the communication route of the power data collection system and creates a detour route even if communication with some slave stations is disabled due to a station failure. By doing so, it is possible to communicate even if a station failure occurs.

Further, since the position of the failed station can be known from the coordinate table, it is easy to identify the failed station in the field.
The time required for repair can be shortened.

Further, in the above-mentioned embodiment, each slave station may be provided with a function as a search command means for outputting a search command to the slave station recognized as a slave station.

[0057]

As described above, according to the present invention,
Search data and search response data are exchanged between the master station and each slave station, and between each slave station, and when transmitting the search response data, the search response data should include information including the identification data unique to the local station. Therefore, it is possible to create communication route information about the communication route between the master station and each slave station based on the search response data, and establish a new system and relocate the slave station.
Even if the configuration of the data collection system is changed due to expansion or failure, it is possible to recognize and re-recognize the communication route of the data collection system, and it is possible to flexibly change the communication route due to changes in the system configuration and system configuration. Can respond.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a power data collection system showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a master station.

FIG. 3 is a configuration diagram of a slave station.

FIG. 4 is a system configuration diagram for explaining an operation when the system is newly installed.

FIG. 5 is an explanatory diagram of a configuration of a communication route table.

FIG. 6 is an explanatory diagram of a configuration of a coordinate table.

FIG. 7 is a flowchart for explaining an operation when a system is newly installed.

FIG. 8 is a system configuration diagram for explaining an operation of a slave station.

FIG. 9 is a system configuration diagram for explaining the operation of another slave station.

FIG. 10 is a flowchart for explaining a process when a relay station needs to be selected.

FIG. 11 is a flowchart illustrating a method of selecting a relay station.

FIG. 12 is a configuration diagram for explaining another embodiment of the master station.

FIG. 13 is a configuration diagram showing another embodiment of the slave station.

FIG. 14 is a system configuration diagram for explaining a station failure detection method.

FIG. 15 is a configuration diagram of a communication route table when a station fails.

FIG. 16 is a configuration diagram of a coordinate table when a station fails.

FIG. 17 is a flowchart for explaining a station failure detection method.

FIG. 18 is a flowchart for explaining a method of searching a slave station when a station fails.

[Explanation of symbols]

20 distribution substation 21 Master station 22 Wireless communication section 23 antenna 24 terminal equipment 25 Control unit 26 Memory 27 Communication route table creation unit 30a to 30d sensor 40a-40d slave station 41 Measuring unit 42 storage 43 controller 44 Wireless communication section 45 antenna

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saburo Yasukawa 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Co., Ltd. Kokubun factory (72) Inventor Hidekazu Matsumoto 7-chome, Omika-cho, Hitachi-shi, Ibaraki No. 1 Hitachi Ltd. in Hitachi Research Laboratory (72) Inventor Kiyoji Iwashita 7-1-1 Omika-cho, Hitachi City, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (56) Reference JP-A-5-137176 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J 13/00-13/00 311

Claims (5)

(57) [Claims] 1. A plurality of slave stations which are distributed along a system and measure state quantities of the system to generate system data,
A master station for collecting systematic data generated by each slave station, wherein the master station serves as a search station, the first search data transmitting means transmitting the search data within the wireless service area of the own station, and the first search. A first slave station recognizing means for recognizing a slave station which has transmitted the search response data as a communicable slave station when receiving the search response data in response to the search data transmitted by the data transmitting means, and a first slave station recognizing means. First communication path information creating means for creating communication path information regarding the communication path between the master station and each slave station based on the search response data from the slave station recognized by First search command means for outputting a search command to the station, and each slave station transmits search data as a search station to the station within the wireless service area of the own station. And the Second slave station recognition means for recognizing the slave station that transmitted the search response data as a communicable slave station when the search response data in response to the search data transmitted by the search data transmission means is received, and the search data for other stations When a message is received, the search response data including the identification data unique to the own station is transmitted to the search station, and the search response data from the slave station recognized by the second slave station recognition means is transmitted to the search station. A data collection system having data transmission means. 2. A plurality of slave stations which are distributed along a system and measure state quantities of the system to generate system data,
A master station for collecting systematic data generated by each slave station, wherein the master station serves as a search station, the first search data transmitting means transmitting the search data within the wireless service area of the own station, and the first search. A first slave station recognizing means for recognizing a slave station which has transmitted the search response data as a communicable slave station when receiving the search response data in response to the search data transmitted by the data transmitting means, and a first slave station recognizing means. First communication path information creating means for creating communication path information regarding the communication path between the master station and each slave station based on the search response data from the slave station recognized by A relay station which selects a slave station other than a station as a destination station and selects a relay station for this destination station from the slave stations recognized by the first slave station recognition means in accordance with the communication path information created by the first communication path information creation means. Choice Means, and a first search command means for outputting a search command to the slave station recognized by the first slave station recognizing means and the relay station selected by the relay station selecting means, each slave station comprising: Searching is performed when second search data transmitting means for transmitting search data within the wireless service area of the station as a search station in response to a search command and search response data in response to the search data transmitted by the second search data transmitting means are received. Second slave station recognition means for recognizing the slave station that has transmitted the response data as a communicable slave station, and transmitting search response data including identification data unique to the local station when the search data of another station is received, to the search station In addition, the search response data transmitting means for transmitting the search response data from the slave station recognized by the second slave station recognizing means to the search station, and the second slave station recognizing means for relaying the search command from the search station. By A data collection system having a search command relay means for transmitting to a recognized slave station. 3. A plurality of slave stations, which are distributed along the system and measure state quantities of the system to generate system data,
A master station for collecting systematic data generated by each slave station, wherein the master station serves as a search station, the first search data transmitting means transmitting the search data within the wireless service area of the own station, and the first search. A first slave station recognizing means for recognizing a slave station which has transmitted the search response data as a communicable slave station when receiving the search response data in response to the search data transmitted by the data transmitting means, and a first slave station recognizing means. Creating communication path information about a communication path including the number of relays between each station and the distance between each station based on the search response data from the slave station recognized by
Among the communication path information created by the first communication path information creating means, the communication path information creating means and the slave stations other than the slave stations recognized by the first slave station recognizing means are used as the destination stations Relay station selecting means for selecting among the slave stations recognized by the first slave station recognizing means according to the number of relays between each station or the distance between each station, and selecting the slave station and relay station recognized by the first slave station recognizing means. First search command means for outputting a search command to the relay station selected by the means, and each of the slave stations transmits search data as a search station within the wireless service area of its own station by the search command. The second search data transmitting means, and the second child that recognizes the slave station that transmitted the search response data as a communicable slave station when the search response data in response to the search data transmitted by the second search data transmitting means is received. The station recognizing means transmits the search response data including the identification data unique to the own station and the position data to the search station when the search data of the other station is received, and the slave station recognized by the second slave station recognizing means. It has a search response data transmitting means for transmitting the search response data to the search station, and a search instruction relay means for relaying the search instruction from the search station and transmitting it to the slave station recognized by the second slave station recognizing means. Data collection system. 4. A plurality of slave stations that are distributed along a system and that measure the state quantity of the system and generate system data,
A master station for collecting systematic data generated by each slave station, wherein the master station serves as a search station, the first search data transmitting means transmitting the search data within the wireless service area of the own station, and the first search. A first slave station recognizing means for recognizing a slave station which has transmitted the search response data as a communicable slave station when receiving the search response data in response to the search data transmitted by the data transmitting means, and a first slave station recognizing means. And a communication path between the master station and each slave station based on the search response data from the slave station recognized by the first slave station recognition means. And a first communication path information creating means for creating communication path information relating to each of the slave stations, wherein each of the slave stations transmits search data as a search station in the wireless service area of its own station by a search command. And the Second slave station recognition means for recognizing the slave station that transmitted the search response data as a communicable slave station when receiving the search response data in response to the search data transmitted by the search data transmitting means, and second slave station recognition Second search command means for outputting a search command to the slave station recognized by the means, and search response data including identification data unique to the local station when the search data of another station is received, and A data collection system having a search response data transmitting means for transmitting the search response data from the slave station recognized by the second slave station recognizing means toward the search station. 5. Each slave station has a failure detecting means for detecting a failure of the slave station by communicating with the communicable slave station, and a failure for transmitting failure information detected by the failure detecting means to another communicable station. An information transmitting means, and the master station has a communication path information updating means for updating the communication path information created by the first communication path information creating means in accordance with the failure information from the slave station. 4. The data collection system described in 4.