JP2023128938A - Process interface unit and power system protection control system - Google Patents

Abstract

To provide a novel PIU (Process Interface Unit) with high reliability.SOLUTION: An interface unit provides information on a current or a voltage acquired from an instrument transformer provided in electric facilities to a protection device or a control device connected with a communication line. The interface unit has a calculation part, a first output circuit, and a second output circuit. The first output circuit outputs to a circuit breaker a command for controlling the circuit breaker to be in an open state in a case where both a first open signal and a second open signal outputted from the calculation part are inputted, or in a case where both a third open signal and a fourth open signal are inputted. The second output circuit outputs to the circuit breaker a command for controlling the circuit breaker to be in an energization state in a case where both a first energization signal and a second energization signal outputted from the calculation part are inputted, or in a case where both a third energization signal and a fourth energization signal are inputted.SELECTED DRAWING: Figure 1

Description

Consists of protection devices that detect and eliminate accidents and protect electrical equipment in the event of an accident in electrical equipment such as power transmission lines, circuit breakers, etc., transformers, etc., control equipment that monitors and controls electrical equipment, and these devices. related to power system protection and control systems.

Conventionally, protection devices and control devices (hereinafter sometimes referred to as protection and control devices) installed in substations have been used to collect system current and voltage information, and status information of electrical equipment such as circuit breakers and transformers. and failure information are obtained via metal cables. Metal cables were also used for control outputs from protection control devices to switches and electrical equipment.
A protection control device is installed for each electrical equipment such as a power transmission line, and is a digital device that uses a microprocessor and software technology, and generally includes a calculation unit that performs protection control processing, system voltage and current information, etc. It consists of an input/output section that inputs status and failure information of electrical equipment and provides control output to switches and electrical equipment, and a transmission section that performs transmission processing with host devices.
On the other hand, with recent technological advances, protection control systems using process buses are being put into practical use. This system is a system in which the input/output units in a conventional protection control device are separated and independent as process interface units (hereinafter referred to as PIUs), and the units are connected through communication using optical cables. This communication path is called a process bus. A PIU is sometimes called a merging unit (MU).
Conventionally, protection control devices and electrical equipment were connected by metal cables, but in this system, a PIU is installed near the electrical equipment, and the PIU transmits system current and voltage information, electrical equipment status information, failure information, etc. The configuration is such that the digital information is captured, converted into digital information, and sent to the protection control device via the process bus, or the control output command for electrical equipment from the protection control device is received via the process bus and the control output is sent to the equipment to be controlled. .
A protection control system using a process bus uses optical cables instead of metal cables to significantly reduce the amount of metal cables within a substation, which can span hundreds of kilometers, depending on the scale of the substation. This is expected to result in reductions in cable space, substation area, and environmental impact.
On the other hand, since the input/output section of the conventional protection control device is separated, an independent PIU is provided, and the input/output section is mounted, the number of devices increases compared to the conventional system. Depending on the system construction concept, a configuration in which a PIU is provided for each protection control device may be considered, and the number of devices is expected to further increase. As a result, the number of devices making up the system increases significantly compared to conventional systems, leading to problems such as complication of the system configuration, deterioration of economic efficiency, and reduction in reliability.

Japanese Patent Application Publication No. 2015-70769

The present invention takes into consideration the above-mentioned problem solving and creates a new highly reliable PIU with an optimal system configuration and an optimal output circuit configuration for a protection control system using a process bus that is expected to be applied in the future. The purpose is to provide
In the present invention, as a solution to the increase in the number of devices and the complexity of the system configuration, the system is configured to provide a PIU that can be used commonly for protection devices and control devices in one electrical equipment such as power transmission lines, or for other devices. In addition to simplifying the configuration, we will maintain the same performance as before, avoid malfunctions due to PIU defects, and implement means to avoid output operation delays during automatic output circuit inspection. This provides a highly reliable PIU.

The PIU (process interface unit) of the embodiment transmits, for example, information regarding current and/or voltage obtained from an instrument transformer installed in electrical equipment such as a power transmission line, and the status of electrical equipment such as a circuit breaker through a communication line. Provided to the connected protection device or control device, or to both the protection device and the control device. The PIU has a calculation section, a first output circuit, and a second output circuit. The calculation unit acquires a first open signal, a second open signal, a first energization signal, or a second energization signal transmitted by the protection device depending on the state of the electrical equipment, and determines the state of the electrical equipment or A third open signal, a fourth open signal, a third energization signal, or a fourth energization signal transmitted by the control device in response to an operation by an operator is acquired, and the acquired first open signal and second open signal are obtained. , outputting the third open signal or the fourth open signal to the first output circuit, and outputting the acquired first energization signal, second energization signal, third energization signal, or fourth energization signal. Output to the second output circuit. The first output circuit operates the circuit breaker when both the first open signal and the second open signal are input, or when both the third open signal and the fourth open signal are input. A command to control the circuit breaker to an open state is output to the circuit breaker. The second output circuit operates the circuit breaker when both the first energization signal and the second energization signal are input, or when both the third energization signal and the fourth energization signal are input. A command to control the energization state is output to the circuit breaker.

1 is a diagram showing an example of the configuration of a substation system 1. FIG. A diagram mainly showing a protection device 32, a control device 42, a PIU 50, and an electrical equipment E. FIG. 6 is a diagram showing an example of a functional configuration of a calculation unit 60. 3 is a diagram showing an example of a functional configuration of an output circuit 80 and an output circuit 82. FIG. FIG. 7 is a diagram for explaining a protection device 32X, a control device 42Y, and a circuit breaker 100 of a comparative example. The figure which shows an example of the functional structure of PIU50A of 2nd Embodiment. FIG. 6 is a diagram for explaining processing executed by the processing unit 68. FIG. 7 is a diagram for explaining processing by another method executed by the processing unit 68; The figure which shows an example of the structure of 1 A of substation systems of 3rd Embodiment.

Hereinafter, a PIU according to an embodiment will be described with reference to the drawings.

<First embodiment>
FIG. 1 is a diagram showing an example of the configuration of a substation system 1 including a PIU. In this embodiment, a substation is treated as an example, but instead of a substation, the substation system 1 of this embodiment is applied to an electric station that handles power receiving and substation systems for power plants, switchyards, factories, and general industries. It's okay.

The substation system 1 is divided into a station level hierarchy, a bay level hierarchy, and a process level hierarchy, with equipment and equipment installed at the station level, equipment and equipment installed at the bay level, and process level hierarchy. It is composed of devices and devices provided at the level and communication lines CL1, CL2, etc. that connect these devices. Bay level is a hierarchy between station level and process level.

[Station level]
At the station level, for example, a TC (Tele-communicate Equipment) 12, an HMI (Human Machine Interface) 14, and a first communication line CL1 are provided. The first communication line CL1 (first network) is sometimes referred to as a station bus, for example. The first communication line CL1 is a communication line that constitutes a LAN (Local Area Network) in a predetermined area within the substation. Note that some or all of the TC12, HMI14, and communication line CL1 may be made redundant.

TC12 is connected to the first communication line CL1. TC is sometimes called GW (Gate Way). The TC 12 is a device that relays transmission and reception of acquired information. The acquired information is information acquired from a device or device connected to the first communication line CL1. The TC 12 is a device that relays communication with devices provided within the substation (for example, the HMI 14) and outside the substation (for example, equipment outside the substation, such as a computer system such as a system control center or a power supply station). The HMI 14 may be configured to directly communicate with each device within the substation (for example, a protection device or a control device), rather than via the TC 12, and collect information within the substation.

HMI14 is connected to TC12. HMI14 and TC12 may be connected via a dedicated line, for example. The HMI 14 includes, for example, a display section, and displays the information collected by the TC 12 on the display section. The display section displays, for example, the operating status of devices and equipment (breakers and transformers) included in the substation system 1, and the amount of electricity (current, voltage, active/reactive power) of electrical equipment such as power transmission lines. . The operator can refer to the information displayed on the display to check the status of equipment and equipment in the substation system 1 and the operating status of the substation system 1, as well as control the equipment and equipment. Can give commands. The above control commands control the use/lock of the device and the opening/closing of the circuit breaker.

[Bay level]
For example, a control panel 40 and a protection panel 30 are provided at the bay level. The control panel 40 is arranged for the purpose of monitoring, controlling, and measuring equipment such as power transmission lines, for example. The control panel 40 receives device control commands for circuit breakers, etc. (in addition to circuit breakers, disconnectors and earthing disconnectors) from the TC 12 and HMI 14, and transmits the received device control commands to the PIU 50, which in turn controls the control target. Controls opening and closing of equipment by giving equipment control commands to circuit breakers, etc. In addition, the PIU 50 takes in the amount of alternating current electricity from the instrument transformer, converts it into digital data, and transmits the digitally converted amount of alternating current electricity to the control panel 40. send out the amount. Note that the control panel 40 may be prepared separately for each device to be controlled. (For example, control panels for power transmission lines, control panels for transformers, control panels for busbars, etc.) Control panels may also be made redundant.

The protection panel 30 takes in the digitally converted alternating current electricity amount from the PIU 50, performs system fault calculation (for example, current differential relay calculation, etc.), and if the calculation result is determined to be a system fault, the protection board 30 shuts off the PIU 50. Sends a command to shut down the device. The PIU 50 outputs a command to the circuit breaker to open the circuit breaker. Note that the protection panel 30 may be prepared individually for each device to be protected. (For example, protection panels for power transmission lines, protection panels for transformers, protection panels for busbars, etc.). Also, the protection panel may be made redundant.

The control device 42 mounted on the control panel 40 and the protection device 32 mounted on the protection panel are sometimes referred to as IEDs (Intelligent Electrical Devices). Hereinafter, the control panel 40 and the protection panel 30 will be explained in this order.

The control panel 40 is connected to a first communication line CL1 and a second communication line CL2. The control panel 40 includes a control device (for example, BCU; Bay Control Unit, etc.) 42. In the substation, the control device 42 is provided for each power facility, such as a line that supplies power to a load or a transformer that converts system voltage, and monitors and controls the power facility. The control device 42 acquires the device status (opening/closing information) of devices such as circuit breakers, disconnectors, grounding devices, etc., electricity amount information, and information on various device failures from the PIU 50 installed in the power equipment to be monitored. Based on the acquired information, it handles information for monitoring and controlling the operating status of power equipment such as power transmission lines. The amount of electricity information is information regarding electric power supplied to a section of electric power equipment, and is information indicating, for example, the voltage value and current value of the electric power supplied to the section. The equipment status information is information regarding the operation of circuit breakers, disconnectors, disconnectors with earthing switches, etc. controlled by the control panel 40 or protection panel 30, and includes, for example, whether the circuit breaker, etc. is in a connected state. This is information indicating whether the device is in a blocked state. The failure information is failure information of various devices arranged in the power equipment. The control device 42 transmits the generated various information to the TC 12 and the like.

The control device 42 acquires, for example, information regarding the status of a system in power equipment such as a line, and the status of various types of equipment from devices, devices, etc. connected to the first communication line CL1 and the second communication line CL2. Further, the control device 42 can control the opening and closing of switches such as circuit breakers and disconnectors for changing the configuration of the system in the power equipment based on its own calculation results or instructions from the operator.

The protection panel 30 includes a protection device 32. The protection panel 30 is connected to a first communication line CL1 and a second communication line CL2. Further, the second communication line CL2 may be made redundant.

The second communication line CL2 (second network) is sometimes referred to as a process bus, for example. The second communication line CL2 is a communication line that constitutes a LAN (Local Area Network) in a predetermined area such as a substation. Hereinafter, the first communication line CL1 may be referred to as a "station bus," and the second communication line CL2 may be referred to as a "process bus."

Here, for example, the first communication protocol of the first communication line CL1 is different from the second communication protocol of the second communication line CL2. For example, the communication protocol of the first communication line CL1 is a station bus communication protocol applied to the IEC 61850 standard, and the communication protocol of the second communication line CL2 is a process bus communication protocol applied to the IEC 61850 standard. It is a protocol. The communication protocol of the first communication line CL1 and the communication protocol of the second communication line CL2 are not limited to the above communication protocols, but may be other communication protocols. The communication protocols of the two communication lines CL2 may be the same. Both the first communication line CL1 and the second communication line CL2 may have a redundant configuration.

The protection panel 30 is a protection relay device that controls circuit breakers provided at each of a plurality of locations in electrical equipment such as power transmission lines provided in a power system. When an accident such as a short circuit or ground fault occurs in the power system, the protection panel 30 eliminates the accident and prevents the accident from spreading by shutting off the circuit breaker and isolating the power equipment or system where the accident occurred. to ensure the sound operation of the power system.

The protection panel 30 acquires power information regarding the power supplied to the section to be protected. The protection panel 30 generates operation information regarding the operation of the circuit breaker, and controls the circuit breaker based on the generated operation information. The protection panel 30 transmits power information and operation information to the control device 42, TC 12, and the like.

[Process level]
A PIU 50 is provided at the process level. The PIU 50 is connected to the second communication line CL2. The PIU 50 is an example of an interface unit with electrical equipment such as an instrument transformer, a switch, or a transformer. When following the system construction concept of conventional substation systems before the application of process buses, a dedicated PIU 50 may be provided for each protection control device, but in this case, the number of devices increases and the resulting In this embodiment, the PIU is shared between the protection device 32 and the control device 42, since problems such as complication of the system configuration, deterioration of economic efficiency, and deterioration of reliability arise. Note that some or all of the second communication line CL2 and PIU50 may be made redundant.

The PIU 50 provides the protection device 32 and the control device 42 connected to the process bus with information regarding current or voltage obtained from an instrument transformer installed in electrical equipment such as a power transmission line. The PIU 50 acquires information indicating the status of the device and information regarding the failure of the device. The PIU 50 is connected to equipment such as an instrument transformer and a circuit breaker connected to a power transmission line, for example. The PIU 50 acquires information acquired by the instrument transformer, the status of equipment such as circuit breakers, etc., and transmits the acquired information to the protection panel 30 and the control panel 40. The PIU 50 converts the amount of system electricity input from the instrument transformer into a digital signal, and sends the converted digital signal to the protection device 32.

FIG. 2 is a diagram mainly showing the protection device 32, the control device 42, the PIU 50, and the electrical equipment E.

[Protective device]
The protection device 32 includes, for example, an accident detection section 34 and a reclosure control section 36. The accident detection unit 34 detects the presence or absence of an accident within the protected section using, for example, information regarding power equipment (for example, current and voltage information) acquired from the PIU 50. For example, the accident detection unit 34 detects the presence or absence of an accident within the protected area using a main detection element such as a current differential element or a distance relay element. When an accident within the protected area is detected based on the main detection element, a signal generated by the accident detection unit 34 (hereinafter referred to as "signal (M)") is output as a first release signal.

Further, the accident detection unit 34 detects the presence or absence of an accident, for example, based on information regarding power equipment (for example, information on current and voltage) acquired from the PIU 50. The accident detection unit 34 uses accident detection elements such as overcurrent elements and undervoltage elements to detect the presence or absence of an accident regardless of the protected area. When an accident is detected based on the accident detection element, the accident detection unit 34 generates and outputs a signal (hereinafter referred to as "signal (FD)") as a second open signal. Note that the above-described method of generating the signal (M) and signal (FD) is an example, and other methods may be used. For example, the above-mentioned signal (M) and signal (FD) are generated by different generation methods, and for example, the signal (FD) generation method is generated by a simpler calculation than the signal (M) generation method. It's a signal. Further, the signal (M) may be output as the second open signal, and the signal (FD) may be output as the first open signal. Note that the accident detection section 34 may be separated into a main detection element related to the signal (M) and an accident detection element related to the signal (FD).

When the reclosing control unit 36 recognizes that the conditions for closing the circuit breaker without any abnormality, such as the gas pressure of the circuit breaker 100 being above a predetermined value, are met, the reclosing control unit 36 generates a reclosing preparation completion signal and generates The ready signal is output as a first energization signal. In addition, the reclosing control unit 36 synchronizes each element related to the voltage of the target system as necessary after a no-voltage period has elapsed after the opening command is output to the circuit breaker 100 and the accident is expected to be eliminated. After confirming that this is the case, the re-closing command signal is output as the second energization signal. Alternatively, the preparation completion signal may be output as the second energization signal, and the reclose command signal may be output as the first energization signal. Note that the reclosing control section 36 may be separated into a part for generating the preparation completion signal and a part for generating the reclosing command signal.

[Control device]
The control device 42 includes, for example, a control command section 44. The control command unit 44 controls the electrical equipment of the system under its jurisdiction based on its own calculation results or instructions from an operator. For example, in the case of opening a circuit breaker, when the control command unit 44 receives a device selection command from the TC 12 or HMI 14 or generates a device selection command based on its own calculation results, the control command unit 44 selects the device to be controlled. It generates a selection signal (release) indicating that it has been selected or selected, and outputs the generated selection signal (release) as a third release signal. Furthermore, when the control command section 44 receives a device control command from the TC 12 or the HMI 14 or generates a device control command based on its own calculation results when opening a circuit breaker, the control command section 44 controls the device to be controlled. A control signal (open) for control is generated, and the generated control signal (open) is output as a fourth open signal. For example, when energizing a circuit breaker, the control command unit 44 selects a device to be controlled when receiving a device selection command from the TC 12 or HMI 14 or when generating a device selection command based on its own calculation result. It generates a selection signal (energization) indicating that it has been selected or selected, and outputs the generated selection signal (energization) as a third energization signal. In addition, when the control command section 44 receives a device control command from the TC 12 or the HMI 14 or generates a device control command based on its own calculation result when energizing a circuit breaker, for example, the control command section 44 controls the device to be controlled. A control signal (energization) for control is generated, and the generated control signal (energization) is output as a fourth energization signal.

[PIU]
The PIU 50 includes, for example, an input conversion section 52, a signal conversion section 54, an input circuit 56, a calculation section 60, an input/output section 70, an output circuit 80 (an example of a "first output circuit"), an output circuit 82 (an example of a "second output circuit") circuit), and a transmission section 90. The input conversion unit 52 removes noise and the like contained in an analog signal (for example, current and voltage information) transmitted from an instrument transformer, and converts the signal into a predetermined analog quantity. The signal converter 54 converts the analog signal output by the input converter 52 into a digital signal. The input circuit 56 acquires status information, failure information, etc. output from electrical equipment such as a switch such as a circuit breaker or a transformer through means such as contacts, and transmits the information to the input/output unit 70 . The input/output unit 70 also acquires the signal output to the calculation unit 60 and outputs the acquired signal to the output circuit 80 or the output circuit 82. The transmission unit 90 is a communication interface for communicating with various devices and devices. In the following description, among the functional configurations included in the PIU 50, the arithmetic unit 60 output circuit 80 and the output circuit 82 will be mainly explained, and illustration of other functional configurations will be omitted hereinafter.

The calculation unit 60 processes input signals and inspects the output circuit. FIG. 3 is a diagram showing an example of the functional configuration of the calculation section 60. The calculation unit 60 includes, for example, an analog signal processing unit 61A, a binary signal processing unit 61B, an opening/closing command unit 62, a protection control command determining unit 64, and an automatic inspection processing unit 66. The opening/closing command unit 62, the protection control command determining unit 64, and the automatic inspection processing unit 66 are realized by a hardware processor such as a CPU (Central Processing Unit) executing a program (software). In addition, some or all of these functional units may be implemented using hardware (circuit units) such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), and GPU (Graphics Processing Unit). ; circuitry), or may be realized by collaboration between software and hardware. The program may be stored in advance in a storage device (a storage device equipped with a non-transitory storage medium) such as an HDD (Hard Disk Drive) or flash memory, or may be stored in a removable storage device such as a DVD or CD-ROM. It may be stored in a medium (non-transitory storage medium), and installed in the storage device by loading the storage medium into a drive device.

The analog signal processing unit 61A acquires the signal output from the signal conversion unit 54, and uses the transmission unit 90 as an interface to transmit the acquired signal using a method such as an SV (Sampled Value) signal specified by IEC61850, for example. It is transmitted to the protection device 32 and the control device 42.

The binary signal processing unit 61B acquires the signal output from the input/output unit 70, and transmits the acquired signal to the transmission unit 90 using a method such as a GOOSE (Generic Object Oriented Substation Events) signal specified by IEC61850. It is transmitted to the protection device 32 and the control device 42 as an interface.

The opening/closing command unit 62 acquires each signal output by the protection device 32 or the control device 42 and outputs the acquired signal to the output circuit 80 or the output circuit 82. The opening/closing command unit 62 outputs a signal to the output circuit 80 or the output circuit 82 so that the signal is input to the contact of the output circuit 80 or the contact of the output circuit 82 depending on the type of signal.

The protection control command determining unit 64 determines whether the acquired signal is a signal output by the protection device 32 or a signal output by the control device 42. When receiving a command from the protection device 32, the protection control command determining unit 64 locks the command from the control device 42. When receiving a command from the control device 42, the protection control command determining unit 64 gives priority to the command from the protection device 32.

The automatic inspection processing section 66 inspects whether or not there is an abnormality in the output circuit 80 and the output circuit 82. The automatic inspection processing unit 66 outputs a first inspection signal, which will be described later, to the output circuit 80, acquires information indicating the operating state of the output circuit 80 according to the first inspection signal from the output circuit 80, and outputs the first inspection signal, which will be described later, to the output circuit 80. Determine whether or not it operates normally (first inspection process). The automatic inspection processing unit 66 outputs a second inspection signal, which will be described later, to the output circuit 82, acquires information indicating the operating state of the output circuit 82 according to the second inspection signal from the output circuit 82, and causes the output circuit 82 to Determine whether or not it operates normally (second inspection process). The automatic inspection processing unit 66 outputs a first inspection signal or a second inspection signal at a predetermined timing and performs inspection processing. The automatic inspection processing section 66 periodically outputs a first inspection signal or a second inspection signal to perform inspection processing. Note that the automatic inspection processing unit 66 may generate the first inspection signal or the second inspection signal upon receiving an instruction to generate the first inspection signal or the second inspection signal from the control device 42. In addition to the predetermined timing, the inspection signal may be output at an arbitrary timing, for example, by manual activation.

In the following explanation, among the functional configurations included in the calculation unit 60, the opening/closing command unit 62, the protection control command determining unit 64, and the automatic inspection processing unit 66 will be mainly explained. omitted.

The output circuit 80 controls the circuit breaker 100 from the energized state to the open state based on the signal instruction outputted by the calculation unit 60, and inspects its own circuit. The output circuit 82 controls the circuit breaker 100 from an open state to a energized state based on an instruction from the protection device 32 or the control device 42 inputted through the calculation unit 60, and inspects its own circuit.

FIG. 4 is a diagram showing an example of the functional configuration of the output circuit 80 and the output circuit 82. The output circuit 80 includes, for example, a contact A, a contact B, and a first inspection section. In the case of operation by the protection device 32, when the signal (M) is input to the contact A, the contact A is controlled from the open state to the energized state. When the signal (FD) is input to the contact B, the contact B is controlled from an open state to an energized state. In the case of operation by the control device 42, when the selection signal (open) is input to the contact A, the contact A is controlled from the open state to the energized state. When a control signal (open) is input to contact B, contact B is controlled from an open state to an energized state. When the contacts A and B are controlled to be energized, the output circuit 80 outputs a signal (open command) for controlling the circuit breaker to an open state to the circuit breaker. The circuit breaker controls the circuit breaker to open when the above signal (open command) is input. As described above, when the output circuit 80 receives both the signal (M) and the signal (FD), or both the selection signal (open) and the control signal (open), the output circuit 80 switches the circuit breaker 100 to the open state. to control.

The first inspection section is normally energized, and when the first inspection signal is input, controls the inspection contacts included in the first inspection section to an open state. When an operation confirmation signal for checking the operation of contact A or contact B is input to contact A or contact B while the inspection contact is controlled to be in the open state, contact A or contact B will open the contact. or turn it on. As a result, the operation of contact A or contact B is checked.

The output circuit 82 includes, for example, a contact C, a contact D, and a second inspection section. In the case of operation by the protection device 32, the contact C is controlled from the open state to the energized state when the ready signal is input. When the re-closing command signal is input to the contact D, the contact D is controlled from an open state to an energized state. In the case of operation by the control device 42, when a selection signal (energization) is input to the contact C, the contact C is controlled from an open state to an energized state. When a control signal (energization) is input to the contact D, the contact D is controlled from an open state to an energized state. When the contacts C and D are controlled to be energized, the output circuit 82 outputs a signal (closing command) to the breaker to control the breaker to be energized (closed state). When the above-mentioned signal (close command) is input to the circuit breaker, the circuit breaker is controlled to be energized (closed state). As described above, the output circuit 82 turns the circuit breaker 100 into the energized state when both the ready signal and the reclose command signal, or both the selection signal (energized) and the control signal (energized) are input. Control.

The second inspection section is normally energized, and when an inspection signal is input, controls the inspection contacts included in the second inspection section to an open state. When an operation confirmation signal for checking the operation of contact C or contact D is input to contact C or contact D while the inspection contact is controlled to be in the open state, contact C or contact D will open the contact. or turn it on. As a result, the operation of contact C or contact D is checked.

Here, with reference to FIG. 5, a protection device 32X, a control device 42Y, and a circuit breaker 100 of a comparative example will be described. In the comparative example, the protection device 32X and the circuit breaker 100X, and the control device 42Y and the circuit breaker 100X are directly connected by a communication line such as a metal cable. Furthermore, no PIU is provided between the protection device 32X and the circuit breaker 100X, and no PIU is provided between the control device 42Y and the circuit breaker 100X.

Furthermore, the protection device 32X includes an accident detection section 34X, an opening/closing circuit control section 36X, an output circuit 80X, and an output circuit 82X. The control device 42X includes a control command section 44Y, an output circuit 80Y, and an output circuit 82Y. As described above, the output circuit and the protection device 32X, and the output circuit and the control device 42X are provided in the same device. Then, the protection device 32X and the control device 42Y each directly output a signal to the circuit breaker to control the circuit breaker.

In recent years, digitalization within electrical stations has progressed, and PIUs are installed near electrical equipment such as voltage transformers (VT/CT), switches, and transformers, and information is aggregated in the PIU and protected. Digital substations are being put into practical use by applying international standards such as IEC 61850 between devices and control devices. However, the configuration shown in FIG. 5 may not be appropriate for a digital substation system. For example, in order to reduce the cost of the PIU hardware, it is preferable to implement a shared output circuit between the protection device and the control device. In addition, when output circuits are shared, it is necessary to consider processing during commands from each device and in the event of a failure, and equipment that can maintain reliability equivalent to the current situation is required. In this embodiment, as described above, by implementing a shared output circuit, it is possible to provide highly reliable equipment while achieving the necessary functions while suppressing costs.

According to the first embodiment described above, the PIU 50 including the calculation unit 60, the output circuit 80, and the output circuit 82 is connected to the protection device 32, the control device 42, or other devices in the substation system 1. In addition, by providing the PIU 50 with a means for processing commands from the protection device 32 with priority over commands from the control device 42, it has the same performance as the conventional system. We are now able to provide a highly reliable PIU and an optimal protection and control system configuration when using a process bus, and can provide a solution to the problems of protection and control systems when using a process bus. be.

<Second embodiment>
The second embodiment will be described below. In the second embodiment, the protection device and the control device share a PIU, the PIU includes two sets of output units, and further has a function of switching the output unit to be used. The second embodiment will be described below, focusing on the differences from the first embodiment.

FIG. 6 is a diagram showing an example of the functional configuration of the PIU 50A of the second embodiment. The PIU 50A includes, for example, a calculation unit 60A. The PIU 50A includes an output circuit 84 and an output circuit 86 in addition to the functional configuration of the first embodiment. The output circuit 84 has the same functional configuration as the output circuit 80, and the output circuit 86 has the same functional configuration as the output circuit 82.

The calculation unit 60A includes a processing unit 68 in addition to the functional configuration of the calculation unit 60 of the first embodiment. The processing unit 68 is realized by a hardware processor such as a CPU executing a program (software). Further, the processing unit 68 may be realized by hardware (including a circuit unit) such as an LSI, an ASIC, an FPGA, or a GPU, or may be realized by cooperation between software and hardware. Note that the calculation section 60A includes an analog signal processing section 61A and a binary signal processing section 61B, but these are omitted in FIG.

The processing unit 68 determines whether an abnormality has occurred in the output circuit 80 or the output circuit 82, and if an abnormality has occurred, the signal that was scheduled to be output to the output circuit in which the abnormality has occurred is changed to The output is output to an output circuit having the same functional configuration as the output circuit for which it is determined that the occurrence is occurring. When an abnormality occurs in the output circuit 80 or the output circuit 82, the processing unit 68 stops the use of the output circuit in which the abnormality has occurred, and uses an output circuit having the same functional configuration as the output circuit in which the abnormality has occurred. The circuit breaker 100 is controlled. Further, when the output circuit 80 or the output circuit 82 is being inspected, the processing unit 68 controls the circuit breaker 100 using an output circuit having the same functional configuration as the output circuit being inspected. .

FIG. 7 is a diagram for explaining the processing executed by the processing unit 68. For example, if an abnormality occurs in the output circuit 80 while the output circuit 80 and the output circuit 82 are being used and the output circuit 84 and the output circuit 86 are not being used, the processing unit 68 stops the use of the output circuit 80. Then, the output circuit 84 is switched to use the output circuit 84 having a similar functional configuration. Note that when the output circuit 80 or the output circuit 82 is used and an abnormality occurs in one or both of the output circuit 80 or the output circuit 82, the processing unit 68 stops the use of the output circuit 80 and the output circuit 82, and Output circuit 84 and output circuit 86 may also be used. Similarly, when the output circuit 80 or the output circuit 82 is being inspected, the use of the output circuit 84 or the output circuit 86 may be switched to.

Furthermore, if an abnormality occurs in the output circuit 84 while the output circuit 84 and the output circuit 86 are used and the output circuit 80 and the output circuit 82 are not used, the output circuit 80 is used and the output circuit 86 is not used. In the event of an abnormality, the output circuit 82 may be switched to be used. Similarly, when the output circuit 84 or the output circuit 86 is under inspection, the use of the output circuit 80 or the output circuit 82 may be switched to.

In addition to switching only the output circuits that are abnormal or under inspection, the output circuits may also be switched at once when a certain output circuit is abnormal or under inspection.

For example, when the output circuit 80 is abnormal or under inspection, and the output circuit 82 is abnormal or not under inspection, there is a method in which only the output circuit 80 is switched to the output circuit 84 and the output circuit 82 is not switched. In addition, for example, when the output circuit 80 is abnormal or under inspection, and the output circuit 82 is abnormal or not under inspection, the output circuits 80 and 82 may be switched to the output circuits 84 and 86. .

FIG. 7A is a diagram for explaining processing performed by the processing unit 68 using another method. For example, if an abnormality occurs in the output circuit 80 while the output circuit 80 and the output circuit 82 are used as a protection device and the output circuit 84 and the output circuit 86 are used as a control device, the processing unit 68 The use of the output circuit 80 is stopped, and the output circuit 84 having the same functional configuration is switched to be used commonly for the protection device and the control device. Further, for example, when an abnormality occurs in the output circuit 82, the processing unit 68 stops using the output circuit 82, and uses the output circuit 86 having the same functional configuration in common for the protection device and the control device. Switch like this. Similarly, when the output circuit 84 is abnormal, the output circuit 80 may be used in common, and when the output circuit 86 is abnormal, the output circuit 82 may be used in common. Similarly, when the output circuit 80 is under inspection, the output circuit 84 is commonly used, when the output circuit 82 is under inspection, the output circuit 86 is commonly used, and when the output circuit 84 is under inspection: The output circuit 80 may be used in common, or the output circuit 82 may be used in common when the output circuit 86 is under inspection. Further, the output circuit 80 and the output circuit 82 may be used for a control device, and the output circuit 84 and the output circuit 86 may be used for a protection device.

According to the second embodiment described above, the substation system 1 includes the output circuit 84 and the output circuit 86 in addition to the output circuit 80 and the output circuit 82, thereby providing a highly reliable system. can. For example, even if the output circuit 80 or the output circuit 82 is being inspected, there is no need to wait for the output process while the inspection process is temporarily interrupted and the normal operating state is restored, and another output circuit can be used. The circuit breaker 100 can be controlled. Further, even if the output circuit 84 or the output circuit 86 is under inspection, the circuit breaker 100 may be controlled using another output circuit. Similarly, if an abnormality occurs in the output circuit 80 or the output circuit 82, or if an abnormality occurs in the output circuit 84 or the output circuit 86, the circuit breaker 100 can be controlled using another output circuit. . Therefore, even if an abnormality occurs in the output circuit or it is being inspected, the circuit breaker can be quickly controlled and shut off without or without delay beyond the specified shutoff time. Delays can be avoided, and a highly reliable PIU 50 and a protection control system with an optimal configuration when applied to a process bus can be provided.

<Third embodiment>
The third embodiment will be described below. In the third embodiment, a plurality of PIUs 50 have a function of controlling the circuit breaker in cooperation. The third embodiment will be described below, focusing on the differences from the first embodiment.

FIG. 8 is a diagram showing an example of the configuration of a substation system 1A according to the third embodiment. The substation system 1A includes, for example, a PIU 50-1 and a PIU 50-2. The PIU 50-1 acquires the signal output by the protection device 32 and the signal output from the control device 42, selects the signal output by the protection device 32 from among the acquired signals, and selects the signal output by the protection device 32. The circuit breaker 100 is controlled based on the signal. The PIU 50-2 acquires the signal output by the protection device 32 and the signal output by the control device 42, selects the signal output by the control device 42 from among the acquired signals, and selects the signal output by the control device 42 from among the acquired signals. The circuit breaker 100 is controlled based on the signal. Based on the above processing, the following processing is performed when an abnormality occurs or during inspection processing.

When an abnormality occurs in the output circuit 80-1 or the output circuit 82-1, or during inspection processing, the PIU 50-1 transmits information indicating that an abnormality has occurred or information that an inspection is being performed to the PIU 50-1. -2. When the PIU 50-2 acquires this information, the PIU 50-2 controls the circuit breaker 100 using an output circuit having the same functional configuration as the output circuit in which an abnormality has occurred or is being inspected in the PIU 50-1. The PIU 50-2 may also have the same functions as the PIU 50-1 that performs the above-described processing.

For example, if an abnormality occurs in the PIU 50-1, information indicating that the abnormality has occurred is sent to the PIU 50-2 using a predetermined communication protocol (for example, GOOSE; Generic Object Oriented Substation Event specified in IEC 61850). Send. When the PIU 50-2 acquires information regarding the abnormality from the PIU 50-1, the PIU 50-2 controls its own device to control the circuit breaker 100 based on the signal output from the control device 42 and the signal output from the protection device 32. . In addition, when an abnormality occurs, instead (in addition), during inspection, the PIU 50-2 responds to the signal output from the control device 42 and the signal output from the protection device 32 as described above. The circuit breaker 100 may be controlled in a state where the circuit breaker 100 can be controlled based on the above. Furthermore, when the PIU 50-2 is under inspection or when an abnormality occurs, the PIU 50-1 can control the circuit breaker 100 based on the signal output from the protection device 32 and the signal output from the control device 42. controlled by the state.

In addition, when an abnormality occurs in the PIU 50-1 (for example, when an abnormality occurs in the output circuit) and the PIU 50-1 acquires a signal for controlling the circuit breaker 100 from the protection device 32, the acquired The signal may be transferred to the PIU 50-2, and the PIU 50-2 may execute processing according to the transfer. Further, when an abnormality occurs in the PIU 50-2, the signal may be transferred to the PIU 50-1, and the PIU 50-1 may execute processing according to the transfer.

In addition to switching only the output circuits that are abnormal or under inspection, the output circuits may also be switched at once when a certain output circuit is abnormal or under inspection. For example, when the output circuit 80 is abnormal or under inspection, and the output circuit 82 is abnormal or not under inspection, there is a method in which only the output circuit 80 is switched to the output circuit 84 and the output circuit 82 is not switched. In addition, for example, when the output circuit 80 is abnormal or under inspection, and the output circuit 82 is abnormal or not under inspection, the output circuits 80 and 82 may be switched to the output circuits 84 and 86. .

According to the third embodiment described above, the substation system 1A has a configuration in which the PIU 50-1 mainly handles signals from the protection device 32 and the PIU 50-2 mainly handles signals from the control device 42, A highly reliable protection control system can be constructed by providing a means for transmitting an abnormal state or an inspection state to the system, and providing a means for functioning as a commonly usable PIU in an abnormal state or an inspection state.

Among the configurations shown in FIG. 8, for example, even if the PIU 50-1 is commonly used for protection and control, and the PIU 50-2 is always on standby and not used, highly reliable protection can be achieved by using the same means as described above. It becomes possible to construct a control system.

Further, the second form and the third form may be combined.

In addition, in the first embodiment, the second embodiment, and the third embodiment, for example, a PIU equipped with a protection function, a control function, etc., or a PIU connected to a station bus in addition to a process bus, for example. Good too.

According to each of the embodiments described above, a more reliable protection device can be realized.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 1... Substation system, 30... Protection panel, 32... Protection device, 40... Control panel, 42... Control device, 50... PIU, 60... Arithmetic unit, 80, 82, 84, 86... Output circuit

Claims (8)

Information about the current and/or voltage obtained from the instrument transformer installed in the electrical equipment and information about the status of the electrical equipment obtained from the electrical equipment are transmitted to the protective device or control device connected to the communication line, or to the protective device. an interface unit for providing both a control device and a control device;
comprising an arithmetic unit, a first output circuit, and a second output circuit,
The arithmetic unit is
obtaining a first open signal, a second open signal, a first energization signal, or a second energization signal transmitted by the protection device according to the state of the electrical equipment;
Obtaining a third open signal, a fourth open signal, a third energization signal, or a fourth energization signal transmitted by the control device according to the state of the electrical equipment or the operator's operation,
outputting the acquired first open signal, second open signal, third open signal, or fourth open signal to the first output circuit;
outputting the acquired first energization signal, second energization signal, third energization signal, or fourth energization signal to the second output circuit;
The first output circuit operates the circuit breaker when both the first open signal and the second open signal are input, or when both the third open signal and the fourth open signal are input. Outputting a command to control the circuit breaker in an open state,
The second output circuit operates the circuit breaker when both the first energization signal and the second energization signal are input, or when both the third energization signal and the fourth energization signal are input. Outputting a command to control the energization state to the circuit breaker;
Process interface unit. a third output circuit including a functional configuration similar to or equivalent to the first output circuit;
a fourth output circuit including a functional configuration similar to or equivalent to the second output circuit,
The arithmetic unit is
determining whether an abnormality has occurred in the first output circuit or the second output circuit or whether the output circuit is being inspected;
When an abnormality has occurred in the first output circuit or when it is being inspected, the first open signal, the second open signal, the third open signal, or the fourth open signal is transmitted to the first output circuit. Instead of, output to the third output circuit,
When an abnormality has occurred in the second output circuit or when it is being inspected, the first energization signal, the second energization signal, the third energization signal, or the fourth energization signal is transmitted to the second output circuit. Instead of, outputting to the fourth output circuit,
A process interface unit according to claim 1. The calculation unit prioritizes processing based on the signal transmitted by the protection device over processing based on the signal transmitted by the control device.
A process interface unit according to claim 1 or 2. The calculation unit executes a first inspection process for inspecting the operation of the first output circuit and a second inspection process for inspecting the operation of the second output circuit.
A process interface unit according to any one of claims 1 to 3. the protection device and the control device are connected to a process bus and a station bus;
the interface unit is connected to the process bus and communicates with the protection device and the control device via the process bus;
A process interface unit according to any one of claims 1 to 4. A plurality of interfaces that provide information regarding current or voltage obtained from an instrument transformer installed in the electrical equipment and information regarding the status of the electrical equipment obtained from the electrical equipment to a protection device or a control device connected to a communication line, or both. A unit,
A first interface unit included in the plurality of interface units connected to the communication line,
comprising a first arithmetic unit, a first output circuit, and a second output circuit,
The first calculation unit is
obtaining a first open signal, a second open signal, a first energization signal, or a second energization signal transmitted by the protection device according to the state of the electrical equipment;
Outputting the obtained first open signal or the second open signal to the first output circuit,
outputting the acquired first energization signal or the second energization signal to the second output circuit;
The first output circuit outputs a command to the circuit breaker to control the circuit breaker to an open state when both the first open signal and the second open signal are input,
The second output circuit outputs a command to the circuit breaker to control the circuit breaker to be energized when both the first energization signal and the second energization signal are input;
A second interface unit included in the plurality of interface units is:
comprising a second arithmetic unit, a third output circuit, and a fourth output circuit,
The second calculation unit is
Obtaining a third open signal, a fourth open signal, a third energization signal, or a fourth energization signal transmitted by the control device according to the state of the electrical equipment or the operator's operation,
Outputting the acquired third open signal or the fourth open signal to the first output circuit,
outputting the acquired third energization signal or the fourth energization signal to the second output circuit;
The third output circuit outputs a command to control the circuit breaker to an open state when both the third open signal and the fourth open signal are input to the circuit breaker,
The fourth output circuit outputs a command to the circuit breaker to control the circuit breaker to be energized when both the third energization signal and the fourth energization signal are input.
Process interface unit. The first calculation unit is
If an abnormality occurs in the first output circuit, transmitting the acquired signal or information indicating that an abnormality has occurred to the second interface unit;
The second arithmetic unit executes a process that was scheduled to be performed by the first arithmetic unit, using the third output circuit instead of the first arithmetic unit.
A process interface unit according to claim 6. An electric power system protection control system comprising the process interface unit according to any one of claims 1 to 7 as a component.

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