JP2014166091A - Merging unit and protection and control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a merging unit which allows for transmission of the binary data of information of a contact, without affecting the communication, while facilitating the handling.SOLUTION: A merging unit includes a processing unit for processing a signal acquired from a power system and outputting digital data indicating the state of a power system, and a communication unit communicating with an external device via a communication line. The processing unit includes a first conversion unit for converting an analog signal of time series of the current or voltage of a power system into digital data, a second conversion unit for converting at least one contact signal, i.e., the information of contacts of the power system, into signal set data of predetermined bits, and a transmission data generation unit for generating transmission data including the signal set data by the second conversion unit in a form similar to the digital data, for a predetermined format for transmitting the digital data converted by the first conversion unit. The communication unit transmits the transmission data to the external device via a communication line.

Description

  The present invention relates to a merging unit and a protection control system that collect at least current or voltage information from a power system.

  Conventionally, when collecting information such as current and voltage from the power system, and when a failure occurs in the power system or power facility, the protection relay device detects the failure and disconnects the failure from the power system. Is used.

  For example, a conventional digital protection relay device performs A / D conversion (analog to digital conversion) on an input current signal or voltage signal (analog signal), and then generates a digital waveform. Perform necessary calculations such as protection relay calculations using data to detect the occurrence of system faults.

  On the other hand, with the advancement of information communication technology in recent years, networking of facilities related to the power system is also progressing. As one of such networking, a distributed protection control system has been put into practical use. A distributed protection control system is a functionally distributed conventional protection relay device, and typically includes one or more merging units that collect information such as current and voltage from the power system. It is done.

  This merging unit generates a digital signal by A / D conversion from an input current signal or voltage signal (analog signal), further converts the generated digital signal into serial data, and outputs it through a communication line. . A determination such as the occurrence of a system fault is performed based on the serial data by an intelligent electronic device (IED (Intelligent Electric Device)) (hereinafter also referred to as IED) that is an arithmetic device connected via the communication line. .

  Various systems have been proposed in this regard. For example, Patent Documents 1 and 2 disclose binary data (for example, 0: contact open, 1: contact, which are contact signals of various devices connected to the communication line in the system. A device corresponding to a merging unit that collects and outputs current (closed binary data) together with current and voltage information has been proposed, but no specific output method is disclosed.

  IEC61850-9-2 specifies the protocol of the serial data communication standard that this merging unit sends to the IED, but in this, current and voltage information are specified, but binary data that is a contact signal There is no mention of the provision of sending to the IED.

  In this regard, conventionally, binary data that is a contact signal is configured to be transmitted in a message-type Goose (Generic Object Oriented Substation Event) signal that is a general object-oriented system event. This is because the contact information has a different frequency of state change compared to current and voltage information whose instantaneous value constantly changes, and a configuration is adopted in which the contact information is transmitted when necessary, that is, when the contact information changes. ing.

Paragraph 0144 of JP 2002-315233 A Paragraphs 0026 and 0029 of JP 2008-67595 A

IMPRLEMENTATION GUIDELINE FOR DIGITAL INTERFACE TO INSTRUMENT TRANSFORMERS USING IEC61850-9-2, UCA International Users Group 2004-07-07

  However, when transmitting binary data that is a contact signal as a Goose signal, it is configured to transmit the change information when the contact information changes (event occurs) as described above, so the Goose signal is received. On the IED side, the change information needs to be latched (stored) and converted into a status signal. Since this information is not retransmitted when the IED side is powered off, it must be stored in the non-volatile memory on the IED side before the power is turned off. That is, since it is necessary to consider that the stored data can be read when the latched information is turned on so as not to disappear, handling of the information may be complicated.

  In addition, a device that needs to incorporate a large amount of contact information, specifically, a specific IED such as a bus protection IED has a plurality of merging units connected to the number of buses or more. Information is transmitted to the IED. In this case, a change in contact information of a circuit breaker or the like installed on a line connected to the bus line occurs at many points almost simultaneously, and Goose signals are transmitted almost simultaneously from these merging units. In other words, in addition to current and voltage information from a plurality of merging units, contact change information of a plurality of circuit breakers and the like are transmitted as Goose signals to a specific IED, so that communication traffic due to sudden fluctuations in communication load The above problems (such as a delay in the time to reach the signal during transmission) may also occur.

  The present invention has been made to solve the above-described problems, and is a merging unit capable of easily transmitting the binary data of contact information without greatly affecting communication, and An object is to provide a protection control system.

  According to one embodiment, a merging unit that collects at least current or voltage information and contact information from a power system according to an aspect, wherein the digital unit indicates a state of the power system by processing a signal obtained from the power system A processing unit that outputs data and a communication unit that communicates with an external device via a communication line. The processing unit converts a time-series analog signal of current or voltage of the power system into digital data, and at least one contact signal that is information on the contacts of the power system into signal set data of predetermined bits. The transmission data including the signal set data by the second conversion unit in the same format as the digital data with respect to the second conversion unit to be converted and the predetermined format for transmitting the digital data converted by the first conversion unit A transmission data generation unit that generates the communication data, and the communication unit transmits the transmission data to the external device via the communication line.

  According to one embodiment, binary data of contact information can be transmitted without greatly affecting communication and easily handled.

It is a schematic diagram which shows the whole structure of the protection control system containing the merging unit according to this Embodiment. It is a block diagram of the merging unit 10 according to the first embodiment. It is a figure explaining the frame structure of the data 50 for transmission according to this Embodiment 1. FIG. It is a figure explaining an example of the data structure of APDU59 according to this Embodiment 1. FIG. It is a block diagram of the merging unit 10A according to the second embodiment. It is a flowchart explaining the acquisition process of the conversion information of IED20 according to this Embodiment 2. FIG. It is a figure explaining the data of the conversion information according to this Embodiment 2. FIG. It is a block diagram of the merging unit 10B according to the modification of this Embodiment 2. FIG. It is a figure explaining the concept of the design of the system configuration according to this Embodiment 3. It is a schematic diagram which shows the structure of the setting apparatus 70 according to this Embodiment 3. FIG. It is an example of the setting tool screen displayed on the display 308 when the setting tool for producing | generating the MU connection setting file according to this Embodiment 3 is performed. It is a figure explaining the MU connection setting file 74 which prescribed | regulated the connection relationship of the switch and merging unit (MU) set in the setting tool screen of FIG.

  The present embodiment will be described below with reference to the drawings. In the description of the embodiments, when the number and amount are referred to, the scope of the present invention is not necessarily limited to the number and amount unless otherwise specified. In the description of the embodiments, the same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated. Unless there is a restriction | limiting in particular, it is planned from the beginning to use suitably combining the structure shown to the structure shown to embodiment.

[1. Embodiment 1]
[1.1 Overall system configuration]
FIG. 1 is a schematic diagram showing an overall configuration of a protection control system including a merging unit according to the present embodiment.

  Referring to FIG. 1, a protection control system 1 is provided in a substation, a distribution station, etc., and collects information on the power system, and based on the collected information, processes such as protection, control, and monitoring of the power system Execute. More specifically, the protection control system 1 may be collectively referred to as a plurality of merging units 10-1 to 10-5 (hereinafter, “merging units 10”) that collect information such as current and voltage from the power system. ) And a plurality of arithmetic devices (Intelligent Electric Device: hereinafter also referred to as “IED”) 20-1 to 20-N (hereinafter referred to as “IED20”). .).

  In general, in the protection control system 1, a plurality of IEDs 20 are arranged according to applications (for example, for each protection target and each control target). Examples of such IEDs by application include protection IEDs that realize protection functions for each protection target (for example, bus protection IED, transformer protection IED, line protection IED for each line, etc.) and control functions. A control IED to be realized is mentioned.

  The merging units 10-1 to 10-5 and the IEDs 20-1 to 20-N can physically communicate data with each other via a process bus 42 according to a predetermined protocol. The process bus 42 may be configured to transmit data using an electrical signal, but in the present embodiment, the process bus 42 is configured to transmit serial data using an optical signal using an optical fiber. The station bus 44 is also configured to transmit serial data by an optical signal using an optical fiber, but the process bus 42 and the transmission protocol are different.

  Each merging unit 10 sends the collected information from the power system to the corresponding IED 20.

  Based on information from each merging unit 10, the IED 20 performs processing such as protection, control, and monitoring of the power system.

  More specifically, as an example of the protection function, the IED 20 determines whether a preset relay operation logic is established at a predetermined cycle, and when the relay operation logic is established, the IED 20 outputs a trip signal to the corresponding circuit breaker. Is output. This trip signal may be transmitted via the process bus 42. Alternatively, it can be transmitted via the station bus 44.

  Further, the IED 20 can output a command such as switching on / off of a switch in the power system as an example of a control function. In addition, in this specification, a switch is a concept including a circuit breaker, a disconnector, and the like.

  Furthermore, IED20 can also output states, such as an electric power system's electric current and voltage, in real time as an example of a monitoring function. The IED 20 is connected to a substation automation system (SAS) device 46 and a remote monitoring control device 28 via a station bus 44.

  The IED 20 can also output power system information to the substation automation system device 46, and also output power system information to the remote control station 29 far from the target power facility via the remote monitoring control device 28. You can also For example, the IED 20 acquires time data indicating when the relay operation logic is established, that is, time data indicating when an abnormality such as an accident is detected from a timer (not shown), and an accident detection signal to which the time data is assigned is acquired. It is possible to transmit to the substation automation system device 46 and the remote monitoring control device 28 via the station bus 44.

  Furthermore, any process other than the processes described above can be implemented in the IED 20. For example, a function corresponding to the substation automation system apparatus 46 may be realized using the IED 20.

  The merging unit 10 is also connected to a station bus 44, and is configured to be able to perform data communication with the substation automation system device 46 and the remote monitoring control device 28 via the station bus 44.

  In FIG. 1, as an example of power equipment, power is supplied to the primary side of the transformer 3 via the power transmission line 2 constituting the power system, and is obtained by voltage conversion (step-down) by the transformer 3. Shows a configuration in which is supplied to the bus 5 via the supply line 4. A plurality of distribution lines are connected to the bus 5, and power is supplied to the load via each distribution line. The protection control system 1 protects, controls, and monitors such power equipment.

  Specifically, the power transmission line 2 is provided with a circuit breaker 6-1 which is a kind of switch, and a current transformer (CT) 7-1 (hereinafter collectively referred to as a current transformer 7). And a voltage transformer (PT / Voltage Transformer: VT) 8-1 (hereinafter also collectively referred to as a transformer 8). The current transformer 7-1 measures information (current waveform) of the current flowing through the power transmission line 2. The instrument transformer 8-1 measures voltage information (voltage waveform) generated in the power transmission line 2. Information measured by each of the current transformer 7-1 and the instrument transformer 8-1 is input to the merging unit 10-1. Further, contact information that is binary data (binary signal) of the circuit breaker 6-1 is input to the merging unit 10-1. The binary data is binary data of 0: contact open, 1: contact close. That is, the merging unit 10-1 collects information on the current flowing through the power transmission line 2, information on the voltage generated in the power transmission line 2, and contact information of a switch such as the circuit breaker 6 provided in the power transmission line 2. . Although only the configuration of the circuit breaker is shown here, various switches such as a disconnecting switch are provided in the power transmission line.

  Similarly, the supply line 4 is provided with a circuit breaker 6-2 and a current transformer 7-2 and an instrument transformer 8-2. Information measured by each of the current transformer 7-2 and the instrument transformer 8-2 is input to the merging unit 10-2. Then, contact information of the circuit breaker 6-2 is also input to the merging unit 10-2.

  A plurality of distribution lines are connected to the bus 5, and each distribution line is provided with a circuit breaker 6-3, 6-4, 6-5, and a corresponding load or an intermediate distribution path. Current transformers 7-3, 7-4, and 7-5 and instrument transformers 8-3, 8-4, and 8-5 are respectively provided so that a failure can be detected. The information measured by each of the current transformers 7-3, 7-4, 7-5 and the instrument transformers 8-3, 8-4, 8-5 is the merging units 10-3 to 10- for each distribution line. 5 respectively. Further, contact information of the circuit breakers 6-3 to 6-5 is also input to the merging units 10-3 to 10-5, respectively. That is, the merging units 10-3 to 10-5 open and close the information on the current flowing through each distribution line connected to the bus 5, the information on the voltage generated in each distribution line, and the circuit breaker 6 provided in each wiring line. Collect contact information of the vessel.

[1.2 Configuration of merging unit]
Next, the configuration of merging unit 10 according to the present embodiment will be described.

FIG. 2 is a configuration diagram of the merging unit 10 according to the first embodiment.
Referring to FIG. 2, in merging unit 10, secondary current and voltage value (analog signal) from current transformer 7 and / or instrument transformer 8 provided in a power transmission line, bus, etc. are merged unit. 10 is input. Further, a contact signal (binary data (digital signal)) of the circuit breaker 6 provided in the power transmission line or bus is input to the merging unit 10.

  The merging unit 10 is usually installed in units of Bay (Bay: for example, a section separated by a pillar in GIS (Gas Insulated Substation)), and collects current information and / or voltage information and contact information of the power system. The digital data indicating the collected information is externally output to the corresponding IED 20. That is, information necessary for power system protection, control, monitoring, and the like is collected by the merging unit 10. As this digital data, typically, serial data in which measured values and the like are arranged in series at every sampling time is used. In other words, the merging unit 10 receives the current waveform signal and / or the voltage waveform signal of the power system, and outputs it as serial data via the communication line (process bus 42) after digital conversion. Further, in this example, the contact signal of the power system is input together with the current waveform signal and / or the voltage waveform signal, and after predetermined processing, it is output as serial data via the communication line (process bus 42).

  Specifically, the merging unit 10 converts a current waveform or a voltage waveform analog signal from the current transformer 7 or the instrument transformer 8 of the power system into digital data and receives input of binary data as a contact signal. A communication unit for transmitting / receiving data and signals to / from the input processing unit, the data processing unit 15, and the corresponding IED 20 is provided.

  The data processing unit 15 processes the current waveform or voltage waveform from the input processing unit and the digital data that is the contact signal, and outputs data indicating the state of the power system.

  The input processing unit electrically isolates the merging unit 10 from the external circuit and converts the analog signal from the current transformer 7 or the instrument transformer 8 into an appropriate voltage signal of the internal circuit. Input conversion circuit 11 (11-1 to 11-n, n is the number of channels of the input conversion circuit), analog filter circuit 12 (12-1 to 12-n) corresponding to each input conversion circuit 11, and each analog filter circuit 12 Are input to the output side while switching, and an AD (Analog to Digital) conversion circuit 14 that converts an analog signal from the multiplexer circuit 13 into digital data and outputs the digital data.

  Each input conversion circuit 11 inputs information from the current transformer 7 or the instrument transformer 8, that is, an analog signal of a current waveform or a voltage waveform, and converts it into an appropriate internal signal inside the merging unit 10, and then responds accordingly. Output to the analog filter circuit 12. Each analog filter circuit 12 outputs the current signal or voltage signal from the corresponding input conversion circuit 11 to the multiplexer circuit 13 after removing the high frequency component.

  The multiplexer circuit 13 has a plurality of input channels corresponding to the plurality of analog filter circuits 12, switches the input in order for the number of input channels in accordance with the switching signal, and converts the analog signal from one channel selected by the switching to AD Output to the conversion circuit 14.

  The AD conversion circuit 14 converts an input analog signal (current or voltage waveform signal) into digital data according to the sampling signal, and outputs the digital data to the data processing unit 15.

  The switching signal for determining the switching period of the input channel of the multiplexer circuit 13 and the sampling signal for determining the sampling period of the AD conversion circuit 14 are supplied from the data processing unit 15 to each of the multiplexer circuit 13 and the AD conversion circuit 14.

  Further, the input processing unit is a digital input interface (DIF) circuit that receives a plurality of digital inputs having a function of insulating the merging unit 10 and an external circuit with respect to binary data (digital signal) that is a contact signal from the circuit breaker 6. 19 (19-1 to 19-p).

  Each DIF circuit 19 receives contact information from the circuit breaker 6, that is, binary data as a contact signal, electrically insulates the merging unit 10 internal circuit, converts it into an appropriate internal signal, and then converts it to a data processing unit. 15 is output.

Next, the configuration of the data processing unit 15 will be described.
The data processing unit 15 includes an analog data processing circuit 20, a memory 21, a transmission formatting circuit 22, a sampling signal generation circuit 23, a data acquisition circuit 25, and a bit / word conversion circuit 26.

  The analog data processing circuit 20 corrects an error generated in the input processing unit or converts the current or voltage digital data from the input processing unit into a current / voltage value per digit specified by a predetermined protocol ( For example, 10 mV / 1 digit, 1 mA / 1 digit) is executed and stored in the memory 21.

  The data acquisition circuit 25 acquires binary data, which is a contact signal from the input processing unit, according to the acquisition timing signal and outputs the binary data to the bit / word conversion circuit 26.

  The sampling signal generation circuit 23 generates a switching signal for the multiplexer circuit 13, a sampling signal for the AD conversion circuit 14, and an acquisition timing signal for the data acquisition circuit 25.

  The bit / word conversion circuit 26 executes predetermined word conversion processing for converting the binary data obtained by the data acquisition circuit 25 into bit data (signal set data) of predetermined bits and stores the data in the memory 21. To do. The word conversion process will be described later.

  The transmission formatting circuit 22 transmits digital data of current or voltage stored in the memory 21 and binary data, which is a contact signal subjected to a predetermined word conversion process, into data for transmission according to a format for indicating the state of the power system. After converting to, output to the communication unit. The transmission formatting circuit 22 typically edits and outputs the current signal or voltage signal collected from the power system and the contact signal into serial data arranged in time series for each sampling period.

  The communication unit includes an EO (Electrical-to-Optical) conversion circuit 16 and a reception circuit 18 that receives a time synchronization signal via a station bus 44.

  The EO conversion circuit 16 corresponds to a transmission processing unit for converting an electrical signal that is digital data from the transmission formatting circuit 22 into an optical signal and then transmitting the optical signal to the IED 20 via the process bus 42.

  As the sample rate of the AD conversion circuit 14, a rate required for protection / control (for example, 80f, f is a system frequency) is used. A sampling signal for this purpose is supplied from the sampling signal generation circuit 23 to the AD conversion circuit 14.

  The sampling signal generation circuit 23 generates a switching signal, a sampling signal, and an acquisition timing signal for the multiplexer circuit 13 from the time synchronization signal received by the reception circuit 18, and supplies the sampling signal to the multiplexer circuit 13, the AD conversion circuit 14, and the data acquisition circuit 25. Output.

  In the data processing unit 15, time-series digital data input from the AD conversion circuit 14 and binary data as contact signals are written into the memory 21 and data for a predetermined period is stored. The memory 21 is a kind of ring buffer having a storage capacity capable of storing data for at least a predetermined period, and the data stored in the buffer for a predetermined period is digital data input from the AD conversion circuit 14 sequentially from old data. It is updated by overwriting. That is, in the buffer, the data is updated after being always stored for a predetermined period after being written.

  Note that the above functions may be a field programmable gate array (FPGA), a microprocessor, a digital signal processor, an application specific integrated circuit (ASIC), or any other application specific function capable of performing the functions described herein. It can be realized based on any one of various types such as a machine configuration of It is also possible to adopt arbitrary various formats of software / hardware.

[1.3 Configuration of data for transmission]
FIG. 3 is a diagram illustrating a frame structure of transmission data 50 according to the first embodiment.

  Referring to FIG. 3, here, a frame structure of transmission data 50 transmitted via process bus 42 according to a predetermined protocol is shown. In this example, as an example, transmission data defined in the guidelines shown in Non-Patent Document 1 will be described.

  The transmission data 50 is set with a preamble 51 which is a signal for recognizing the start of frame transmission and giving synchronization timing, a destination address 52 where a destination MAC address is set, and a MAC address which is a source Source address 53, priority tag 54 relating to priority, type 56 for setting an identifier (ID) indicating the type of communication protocol to be transmitted, APPID 57 for specifying an application ID, reserve 58 which is a reserved area, application protocol data The unit (APDU) 59 includes frame check data 60 in which a CRC (Cyclical (Cyclic) Redundancy Check) value for detecting a frame error is set.

  Note that the structure is general, and the frame structure can be appropriately changed depending on the protocol.

FIG. 4 is a diagram illustrating an example of a data structure of APDU 59 according to the first embodiment.
With reference to FIG. 4, it is a figure explaining an example of the application service data unit (ASDU) which comprises APDU59.

  Specifically, the case where the APDU 59 is configured by a header portion 62 in which the configuration of the data structure is described and eight (8 channels) ASDUs 64 is shown as an example.

  It is assumed that a plurality of sets of data groups can be stored in the ASDU of each channel. As an example, it is assumed that a 32-bit data group (word) can be stored as one set.

  In this example, analog signals (AI-1 (t) to AI-8 (t)) are allocated and stored in the first (one channel) ASDU1, and the second (two channels) ASDU2 is stored. In contrast, a case is shown in which contact signals (DI-1 (t) ˜) are assigned and stored.

  Here, as data stored in the ASDU 2, word data that has been word-converted by the bit / word conversion circuit 26 is stored.

  The binary data that is the read contact signal is converted by the bit / word conversion circuit 26 from a signal of 1 bit to word data (signal set data) composed of a plurality of bits.

  Specifically, when the data length of the analog signal (AI) is 32 bits, the bit / word conversion circuit 26 has one word so that the data length of the digital signal (DI) is 32 bits accordingly. Set the bit length. In this example, in order to facilitate data processing, a case will be described in which binary data that is a contact signal is set to a bit length of one word (32 bits) in accordance with the data length of an analog signal. It is not necessary to set the bit length of the word, the bit length can be adjusted to an appropriate length as necessary, and one set of signal set data composed of a plurality of bits from a signal of 1 bit as a contact signal Any configuration may be used as long as the configuration can be converted into the above.

  If bits from DI-10 to DI-1 31 are arranged in order from outputs from a plurality of DIF circuits 19 (a plurality of channels), they can be handled as if they were one analog data.

  In the bit / word conversion circuit 26, data DI-1 to DI-m (m is necessary after word conversion) necessary for the number of channels of a plurality of contact signals (digital signals) input to the plurality of DIF circuits 19. Which corresponds to the value obtained by dividing the number of channels of a digital signal divided by 32).

  After that, these data are recorded in the memory 21 as time data at that time.

  The data stored in the memory 21 is handled in the same way as analog data, and is included in the transmission data in the transmission formatting circuit 22.

  Here, in the data acquisition circuit 25, the signal of the DIF circuit 19 is read by the acquisition timing signal from the sampling signal generation circuit 23. This acquisition timing signal can be synchronized with the AD conversion sampling signal.

  On the other hand, the sampling signal and the acquisition timing signal do not need to be the same. For example, the signal is set at an integer multiple of the AD conversion sampling period so that the signal has a necessary period as the time resolution of the digital information. Also good. For example, assuming that the AD conversion sampling period is 80 times the rated frequency of the system, when the rated frequency is 50 Hz, the sampling frequency is set to 4000 Hz. If the required value of the time resolution of digital information is 1 ms, the period of the acquisition timing signal may be 1000 Hz. Therefore, the binary data may be acquired every four of the AD conversion sampling periods. .

  In this case, the value of binary data, which is a contact signal transmitted together with the analog data, is updated every 4 time data of the analog data of the transmission data.

  In the merging unit of this example, as with analog data after digital conversion of current and voltage input, binary data that is a contact signal is acquired at a timing synchronized with the analog data, and word conversion is performed according to the analog data length. As with analog data, it can be included in transmission data and transmitted.

  On the IED 20 side, it is necessary to set in advance information necessary for restoring binary data as a contact signal from transmission data. Specifically, it is necessary to set the correspondence between the bit of the word data and the contact signal of the switch on the IED 20 side in advance.

  On the IED 20 side, after receiving the transmission data, for the binary data that is the contact signal, each bit data constituting the word data is converted into an easy-to-handle format by performing bit / flag conversion or the like. It suffices to perform the operation.

  That is, binary data as contact signals can be handled in the same way as analog data as a transmission format, and binary data can be transmitted to the IED in the form of status (state) information. There is also an advantage that handling is easy because there is no need to perform processing such as latching using a non-volatile memory necessary for transmission only when the status changes.

  In this embodiment, a method of arranging 32 pieces of binary data is described as a method of converting binary data into a 32-bit word having an analog data length. However, in order to increase the reliability of 1-bit binary data, for example, The number of bytes (8 bits) may be arranged to be 32 bits, and the data length is the same as that of analog data.

  In addition, since it is not necessary to transmit binary data as a contact signal using a Goose signal, it is possible to avoid a situation in which Goose signals are transmitted all at once when a failure occurs. That is, since binary data as a contact signal is constantly transmitted, there is no problem in communication traffic due to a sudden change in communication load. Also, since binary data as contact signals can be steadily acquired, the state of a switch or the like can be easily steadily monitored instead of monitoring its state when an event occurs. Is possible.

[2. Second Embodiment]
In the second embodiment, another configuration example of the merging unit applied to the protection control system 1 will be described. Other configurations except the merging unit 10A of the protection control system 1 are the same as those in FIG. 1 of the first embodiment.

FIG. 5 is a configuration diagram of the merging unit 10A according to the second embodiment.
Referring to FIG. 5, merging unit 10A in FIG. 5 differs from merging unit 10 in FIG. 2 in that bit / word conversion circuit 26 is replaced with bit / word conversion circuit 26A and via station bus 44. The difference is that an EO / OE conversion circuit 30 for transmitting / receiving data to / from the IED 20 is further provided. The EO / OE conversion circuit 30 and the bit / word conversion circuit 26A are connected.

  Since the other configuration of the merging unit 10A is the same as that of the merging unit 10, only the differences will be described here.

The bit / word conversion circuit 26 </ b> A includes a conversion information generation unit 32.
The conversion information generation unit 32 generates conversion information related to a series of methods for converting binary data that is a contact signal into word data of a predetermined bit and including it in transmission data. Specifically, information relating to conversion of word data of a predetermined bit in the bit / word conversion circuit 26A can be included as conversion information. In addition, information related to other transmission formatting can be included in the conversion information. The conversion information is information necessary for restoring binary data that is a contact signal from transmission data on the IED 20 side.

  The EO / OE conversion circuit 30 has an OE (Optical-to-Electrical) conversion function for receiving a request signal from the IED 20 or the like, and EO conversion for transmitting data (conversion information) for the request signal to the IED 20 or the like. It has a function.

  FIG. 6 is a flowchart illustrating conversion information acquisition processing of IED 20 according to the second embodiment. This process may be executed when the IED 20 is activated, or may be executed every predetermined period.

  Referring to FIG. 6, first, IED 20 determines whether or not it has conversion information from merging unit 10A for data communication (step S2).

  In step S2, if it is determined that the IED 20 does not have the conversion information from the merging unit 10A for data communication (NO in step S2), the IED 20 transmits the conversion information to the merging unit 10A for data communication. A request signal is transmitted to (step S4). The request signal transmitted from the IED 20 to the merging unit 10A is received by the EO / OE conversion circuit 30 of the merging unit 10A via the station bus 44.

  Then, the bit / word conversion circuit 26A of the merging unit 10A transmits the conversion information generated by the conversion information generation unit 32 to the IED 20 in response to the request signal received via the EO / OE conversion circuit 30. Specifically, the EO / OE conversion circuit 30 transmits the conversion information to the IED 20 via the station bus 44.

  Thereby, the IED 20 acquires conversion information from the merging unit 10A that performs data communication, and executes a setting process for restoring binary data that is a contact signal from the transmission data based on the conversion information (step S6). .

Then, the process ends (END).
On the other hand, if it is determined in step S2 that the conversion information from the merging unit 10A for data communication is included, the processes in steps S4 and S6 are skipped and the process is terminated. This is because there is no need to request conversion information. In addition, since there is a possibility that the conversion information is updated or changed, even if it is determined in step S2 that the conversion information is included, if the predetermined period has elapsed, You may make it perform the process of step S4 and step S6.

  Note that the conversion information is communicated via the station bus. However, if there is no problem in the communication of the conversion information with respect to the communication of the current / voltage information and the switch information on the process bus 42, there is no problem. It is also possible to communicate via the process bus 42.

FIG. 7 is a diagram illustrating conversion information data according to the second embodiment.
Referring to FIG. 7, here, the data body structure of conversion information 80 is shown, and header information and the like necessary for data communication with IED 20 and the like provided at the head of the data are omitted.

  Here, arrangement information 81 of binary data that is a contact signal in the format of transmission data (for example, information that can identify which channel's ASDU is used to store binary data that is a contact signal), Word length 82 (data regarding the number of bits converted by the bit / word conversion circuit), update period 83 (information regarding the period of the acquisition timing signal), total number of bits 84 (number of binary data as contact signals), bit arrangement 85 (information indicating arrangement from the least significant bit LSB to the most significant bit MSB in order or information indicating an aliasing sequence) or the like on the IED 20 side to restore binary data as a contact signal from transmission data Necessary information may be included.

  By this processing, there is an advantage that it is not necessary to set the binary data, which is a contact signal input to the merging unit 10A, from the transmission data, so that it is not necessary to set on the IED 20 side, and there is also an advantage that problems such as setting errors can be solved.

[3. Modification of Embodiment 2]
In the modification of the second embodiment, another configuration example of the merging unit applied to the protection control system 1 will be described. Other configurations of the protection control system 1 excluding the merging unit 10B are the same as those in FIG. 1 of the first embodiment.

  In merging unit 10A according to the second embodiment described above, a configuration has been described in which conversion information related to conversion processing executed in the bit / word conversion circuit is generated and transmitted to IED 20 or the like on merging unit 10A side.

  In the modification of the second embodiment, a configuration in which the merging unit 10A does not generate the conversion information but inputs the conversion information from the outside will be described.

FIG. 8 is a configuration diagram of a merging unit 10B according to a modification of the second embodiment.
Referring to FIG. 8, the merging unit 10B in FIG. 8 is for receiving conversion information from the IED 20 or the like via the digital data setting unit 33 and the station bus 44, as compared with the merging unit 10 in FIG. The difference is that an OE conversion circuit 34 having an OE conversion function is further provided. The OE conversion circuit 34 and the bit / word conversion circuit 26 are connected.

  Since the other configuration of the merging unit 10B is the same as that of the merging unit 10, only the differences will be described here.

  The OE conversion circuit 34 has an OE (Optical-to-Electrical) conversion function for receiving conversion information from the IED 20 or the like.

The OE conversion circuit 34 outputs the received conversion information to the digital data setting unit 33.
Note that the conversion information 80 described with reference to FIG. 7 can be used as an example of the conversion information.

  Based on the received conversion information 80, the digital data setting unit 33 converts the binary data, which is a contact signal, into word data and outputs an instruction to adjust various parameters related to the above method included in the transmission data. .

  Specifically, the digital data setting unit 33 instructs the transmission formatting circuit 22 to arrange the word data processed by the bit / word conversion circuit 26 at a predetermined position of the transmission data based on the arrangement information. The digital data setting unit 33 instructs the transmission formatting circuit 22 based on the information regarding the total number of bits and the bit arrangement so as to be in an appropriate format with respect to the configuration of binary data that is a contact signal for transmission data. You may do it.

  Also, the digital data setting unit 33 instructs the bit / word conversion circuit 26 to perform conversion processing so as to obtain the designated word length based on the word length. In addition, the digital data setting unit 33 instructs the sampling signal generation circuit 23 to adjust the period of the acquisition timing signal generated based on the update period.

  Note that the conversion information does not need to include all the various parameters described in FIG. 7, and may include at least one. Also, the conversion information is not limited to that described with reference to FIG. 7, and may include information necessary for other conversions.

  In the second embodiment and the modification, the configuration in which data is transmitted or received via the station bus 44 as exchange of conversion information has been described. That is, although the example using the OE conversion circuit or the EO / OE conversion circuit has been described, there is room for communication of current / voltage information and switch information in the process bus 42, not in the station bus 44, If there is no problem in communication, the exchange of the conversion information may be executed using a communication interface for transmitting or receiving data via the process bus 42.

  In the case of the station bus 44, the conversion information is not limited to the case where the conversion information is transmitted from the IED 20, but the conversion information is transmitted from the substation automation system device 46 or the remote monitoring control device 28 to the merging unit 10B via the station bus 44. May be transmitted.

  By adopting such a configuration, in this way, there is an advantage that adjustment of the parameters of the conversion process that is optimal on the IED side is possible. On the other hand, when multiple IEDs use data from the same merging unit, it is necessary to set which IED has priority, etc., so the correspondence between the merging unit and the IED is 1: 1. In addition, this method can be used as a more preferable form.

  In the above description, the data transmission of the contact information of the switch is mainly described. However, information other than the contact information of the switch can also be transmitted in the same manner. Specifically, analog signal setting information (for example, information required on the IED side for setting analog data in the merging unit, such as CT ratio and PT ratio) may be transmitted in the same manner.

[4. Embodiment 3]
In the first embodiment, the case where the association between the bit of the word data and the contact signal of the switch is set in advance on the IED 20 side has been described.

In the third embodiment, a method for facilitating the setting will be described.
IEC61850-6 defines the substation configuration language (SCL). It is possible to support the design of a protection control system such as a substation using the substation configuration language (SCL). Specifically, a system specification description file (SSD file) that describes the formal specifications of substations with a single line diagram and functions of logical nodes, and supported communication with IED logical nodes used in substation automation system devices A system configuration tool for designing a protection control system using an IED function description file (ICD file) representing service functions is used.

It is possible to set the function of the IED using the system configuration tool.
FIG. 9 is a diagram for explaining the concept of designing the system configuration according to the third embodiment.

  Referring to FIG. 9, here, a configuration in which an IED 20 and a setting device 70 are connected to a station bus 44 is shown. The setting device 70 is a device in which the above-described system configuration tool is stored, and an IED setting file that is a file for setting the function of the IED 20 can be created by the setting device 70.

  Then, the setting device 70 transmits the set IED setting file 72 to the IED 20.

  The IED 20 recognizes the merging unit 10 capable of data communication according to the IED setting file 72 transmitted from the setting device 70. In this example, a merging unit 10 having an identifier “001” is provided as an example, and a configuration for performing data communication with the merging unit 10 is shown. Note that data communication may be performed with the merging unit 10 via the station bus 44, or data communication may be performed via the process bus 42 described above.

  In addition, the IED setting file 72 includes, as an example, information on the circuit breaker 6 and the like that the IED 20 controls according to the preset relay calculation logic described above. The file includes information on the switches provided in the power system controlled by the IED 20 without being limited to the circuit breaker 6. The contact signal of the circuit breaker 6 and the like is input to the merging unit 10.

  In the third embodiment, the setting device 70 further transmits a MU connection setting file 74 that is information related to the connection relationship between the merging unit 10 and the switch.

FIG. 10 is a schematic diagram showing a configuration of setting apparatus 70 according to the third embodiment.
Referring to FIG. 10, setting device 70 is basically composed of a general-purpose personal computer. However, it may be implemented as dedicated hardware.

  The setting device 70 includes a processor 302, a RAM 304, a communication interface 306, a display 308, an input unit 310, and a data holding unit 320. These components are connected to each other via a bus 330 so that data communication can be performed. The data holding unit 320 is obtained by executing a tool program 322 including a system configuration tool for designing the protection control system described above, a setting tool for generating a MU connection setting file, and the tool program 322. A setting file 324. The setting file 324 includes the MU connection setting file 74 together with the IED setting file 72 described above.

  Note that the system configuration tool included in the tool program 322 is known and can generate the IED setting file 72.

  The processor 302 reads the tool program 322 from the data holding unit 320 and executes it while expanding it in the RAM 304. When the tool program 322 is executed by the processor 302, a design operation for designing the protection control system is realized. Specifically, an interface screen for designing the protection control system is provided.

  Note that the tool program 322 may implement processing necessary for its execution using a common module provided by the operating system. That is, even when the program according to the present embodiment and the operating system cooperate to realize the processing according to the present embodiment, it can be included in the technical scope of the present invention.

  The communication interface 306 is an interface for connecting to other devices via the station bus 44, and exchanges necessary data between the merging unit 10 and the IED 20.

  The display 308 is a display device that displays an interface screen generated by the execution of the tool program 322 to the user. The input unit 310 includes a keyboard, a mouse, and the like, and receives an operation from the user. Furthermore, a printer for printing out predetermined data may be installed. Naturally, it is possible to provide the function in, for example, the remote monitoring control device 28 without newly providing the setting device 70.

  FIG. 11 is an example of a setting tool screen displayed on the display 308 when the setting tool for generating the MU connection setting file according to the third embodiment is executed. As described above, the setting tool is included in the tool program 322.

  Referring to FIG. 11, here, a case where various switches, merging units, and IEDs are displayed in a schematic block format on the setting tool screen is shown. It is assumed that the user can design a connection of various blocks on the interface screen and design a MU connection setting file via the input unit 310.

  Here, as an example, as a switch provided in an electric power system controlled by the IED, two disconnectors (line switches) (LS1, LS2), a circuit breaker (CB1), and ground disconnectors (ES1, ES2) ) And are provided.

  These switches are shown connected to the terminals (TDI-1 to TDI-5) of the merging unit (MU).

  Specifically, the disconnector LS1 is connected to the terminal TDI-1 and receives a contact signal. Further, the disconnector LS2 is connected to the terminal TDI-5 and receives a contact signal. Similarly, the circuit breaker CB1 is connected to the terminal TDI-3 and receives a contact signal. The ground disconnector ES1 is connected to the terminal TDI-2 and receives a contact signal. The ground disconnector ES2 is connected to the terminal TDI-4 and receives a contact signal.

  Then, by executing the data set on the setting tool screen, the tool program 322 generates the MU connection setting file 74 that defines the connection relationship between the switch and the merging unit (MU).

  FIG. 12 is a diagram for explaining the MU connection setting file 74 that defines the connection relationship between the switch and the merging unit (MU) set on the setting tool screen of FIG.

  Referring to FIG. 12, the tool program 322 generates the MU connection setting file 74 by executing the data set on the setting tool screen. The column “DI-1...” Is provided for ease of explanation, and the information is not transmitted.

  Here, in the MU connection setting file 74, as the connection setting information of the merging unit (“001”), a table in which the terminal name of the merging unit 10 and the switch are associated is shown.

  Specifically, the type of the switch to which the terminal is associated and connected in order from the first terminal TDI is shown.

  Here, in the third embodiment, by transmitting the IED setting file 72 from the setting device 70 to the IED 20, it is possible to obtain information on the switch and merging unit controlled by the IED 20, and By transmitting the MU connection setting file 74 to the IED 20, it is possible to obtain information regarding which terminal of the merging unit to be controlled by the contact signal of the switch to be controlled.

  As a result, for example, contact signals input to the terminals TDI-1 to TDI-31 are transmitted as data for transmission as word data DI-1 (t) (bits from DI-10 to DI-1 31). When it is included and transmitted from the IED 20, the association becomes easy. That is, the state of the contact signal of the disconnector LS1 can be acquired by referring to the bit of DI-10. The same applies to other examples.

  By the setting method, on the IED 20 side easily based on the IED setting file generated using the existing system configuration tool and the MU connection setting file that defines the connection relationship between the switch and the merging unit (MU). It is possible to set information necessary for restoring binary data as a contact signal from transmission data.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 protection control system, 2 power transmission line, 3 transformer, 4 supply line, 5 bus, 6 circuit breaker, 7 current transformer, 8 instrument transformer, 10, 10A, 10B merging unit, 11 input conversion circuit, 12 Analog filter circuit, 13 Multiplexer circuit, 14, AD conversion circuit, 15 Data processing unit, 18 Receiver circuit, 20 Analog data processing circuit, 21 Memory, 22 Transmission formatting circuit, 23 Sampling signal generation circuit, 25 Data acquisition circuit, 26 26A bit / word conversion circuit, 28 remote monitoring control device, 29 remote control station, 32 conversion information generation unit, 33 digital data setting unit, 42 process bus, 44 station bus, 46 substation automation system device, 70 setting device, 302 processor, 304 RAM, 306 communication interface Interface, 308 display, 310 input unit, 320 data storage unit, 322 tool program, 330 bus.

Claims (4)

A merging unit that collects at least current or voltage information and contact information from a power system,
A processing unit that processes a signal acquired from the power system and outputs digital data indicating a state of the power system;
A communication unit that communicates with an external device via a communication line;
The processor is
A first converter that converts a time-series analog signal of the current or voltage of the power system into digital data;
A second converter that converts at least one contact signal, which is contact information of the power system, into signal set data of a predetermined bit;
Transmission for generating transmission data including the signal set data by the second conversion unit in a format similar to the digital data with respect to a predetermined format for transmitting the digital data converted by the first conversion unit Including a data generation unit,
The communication unit is a merging unit that transmits the transmission data to the external device via the communication line. The second conversion unit includes a conversion information generation unit that generates conversion information related to a method of converting the contact signal into the signal set data to be included in the transmission data,
The merging unit according to claim 1, wherein the communication unit transmits the conversion information to the external device via the communication line. The communication unit accepts conversion information related to a method of converting the contact signal into the signal set data and including it in the transmission data from the external device,
The processing unit further includes a setting unit configured to set a parameter of a method to be converted into the signal set data with respect to the contact signal based on the conversion information received by the communication unit and included in the transmission data. Merging unit. A protection control system for protecting the power system,
At least one switch for controlling an electrical path of a transmission line of the power system;
A merging unit that collects at least current or voltage information from the power system and contact information of the at least one switch;
An arithmetic unit for receiving the data from the merging unit and controlling the circuit breaker,
The merging unit is
A processing unit that processes a signal acquired from the power system and outputs digital data indicating a state of the power system;
A communication unit that communicates with an external device via a communication line,
The processor is
A first converter that converts a time-series analog signal of the current or voltage of the power system into digital data;
A second converter that converts at least one contact signal, which is contact information of the power system, into signal set data of a predetermined bit;
Transmission for generating transmission data including the signal set data by the second conversion unit in a format similar to the digital data with respect to a predetermined format for transmitting the digital data converted by the first conversion unit Including a data generation unit,
The communication unit transmits the transmission data to the external device via the communication line,
The said arithmetic unit is a protection control system which acquires the state of a contact signal from the said signal set data contained in the said transmission data based on the connection information in which the said at least 1 switch is connected to the said merging unit.

Images