Protection control system and protection control method

Abstract

To perform an operation test for each unit in a distributed protection control system device.SOLUTION: A protection control system includes a merging unit, and a protection control device connected to the merging unit via a communication network. When a signal indicating an amount of electricity of a power system is input, the merging unit converts the amount of electricity into digital data to output the digital data to a communication network. The protection control device receives the digital data regarding the amount of electricity from the communication network and executes protection control operation to output a digital command corresponding to results of the protection control operation to the communication network. The merging unit receives the digital command to output a control command based on the digital command to facilities of the power system. The protection control device includes a local output unit that outputs results of the protection control operation to a local communication path different from the communication network.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a protective relay system to which a process bus is applied and a test method thereof. [Background technology]

[0002] Today's new digitalized protection and control systems are primarily comprised of an IED device that performs calculation processing for protection and control, and a MU device that receives analog signals and outputs control commands, and are becoming distributed systems in which communication between devices is processed by communication signals. However, because they are distributed, equipment tests can only be performed during combined operation using a "test device" that verifies the response output signal from the test input for protective relay operation, and testing of individual devices requires testing using dedicated test input and output signals.

[0003] One example of technology relating to a method for testing a distributed protection and control system is described in JP 2013-165591 A (Patent Document 1). Patent Document 1 states that "the test setting unit generates test setting information indicating that the integrated unit setting and display device has set the integrated unit to a testable state. The communication interface unit of the integrated unit sends the test setting information and electrical quantity information to the protection unit side via the process bus. The relay calculation unit of the protection unit receives the test setting information in combination with the electrical quantity information, which is system information, and executes a relay calculation test. A protection unit display device is connected to the process bus and the protection unit, and displays the test setting information on this device." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-165591 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the past, when performing actual testing of an "integrated or unified protection and control system" in a protection and control system, there was a "test device" that output a test signal from the test device and took in the output of the operation result of the test subject to perform test measurements.

[0006] In contrast, in today's new digitalized protection and control systems, the IED devices that mainly perform calculation processing for protection and control and the MU devices that take in analog signals and output control commands are installed at different locations, forming a distributed system connected by a communication network.In such a distributed system, when the only communication between devices is by communication signals, it is not possible to test the operation of each individual device in a conventional test environment using analog signals using existing "test equipment."

[0007] The above-mentioned Patent Document 1 proposes a test method in which a communication test on the interface between two devices is used to transmit electrical quantity information with a test flag added, and a control command with a test flag added is captured to perform a test. However, this method requires specifications for handling dummy data with a test flag added to each device, so the test may not be possible in cases where dummy data communication is not supported, such as in combination with existing devices or in a multi-vendor combination using products from other companies as the opposing device. In addition, in a real-environment test, there may be cases where existing equipment is connected to the communication network that communicates on the IF between two devices, so there are cases where it is desirable to avoid pouring dummy information for testing into the communication network. [Means for solving the problem]

[0008] In order to solve at least one of the above problems, the present invention provides a protection and control system having a merging unit and a protection and control device connected to the merging unit via a communication network, wherein when a signal indicating an electrical quantity in a power system is input, the merging unit converts the electrical quantity into digital data and outputs the digital data to the communication network, the protection and control device receives the digital data of the electrical quantity from the communication network and executes a protection and control calculation, and outputs a digital command according to the result of the protection and control calculation to the communication network, the merging unit receives the digital command and outputs a control command based on the digital command to equipment in the power system, and the protection and control device has a local output unit that outputs the result of the protection and control calculation to a local communication path different from the communication network. Effect of the Invention

[0009] According to one aspect of the present invention, it is possible to perform operation tests on each unit of protection and control system equipment for digital substations, which are distributed and communicate with each other via communication, by using conventional test equipment that inputs analog current and voltage signals and uses end-to-end signals to detect control output signals.

[0010] Also, there is no need to transmit unnecessary dummy data for testing to the actual operating environment network.

[0011] Furthermore, even if the opposing device used is a product from another company that only supports actual operation, testing can be performed in a real environment, making it possible to perform isolation tests during installation tests or when using a combination of products from other companies.

[0012] Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0013] [Figure 1]FIG. 1 is an explanatory diagram illustrating an example of a protection and control system test environment according to an embodiment of the present invention. [Diagram 2] 1 is an explanatory diagram showing an example of an actual operation test targeting the entire protection and control device and merging unit in a protection and control system test environment of an embodiment of the present invention. FIG. [Diagram 3] FIG. 1 is an explanatory diagram showing an example of a monitor operation test for a protection and control device and a merging unit in a protection and control system test environment of Example 1 of the present invention. [Figure 4] FIG. 2 is an explanatory diagram showing an example of a monitor operation test targeting only the protection and control device in the protection and control system test environment of the first embodiment of the present invention. [Diagram 5] FIG. 11 is an explanatory diagram showing an example of internal processing of a protection and control device in a protection and control system test environment of Example 2 of the present invention. [Figure 6] FIG. 11 is an explanatory diagram showing an example of internal processing of a local output unit of a protection and control device in a protection and control system test environment of Example 2 of the present invention. [Figure 7] 4 is a flowchart illustrating an example of processing in a protection and control system test environment according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] In an embodiment of the present invention, a local output terminal for testing is provided on the protection and control device (IED) side, and a monitor output section is provided that extracts signals during operation and responds to tests. This makes it possible to perform relay tests on individual IEDs when replacing them using conventional test equipment. Furthermore, by ensuring that the data handled by the "local output section" of the IED is the same data as the results of the protection and calculation section handled by the actual "transmission data processing section", it is guaranteed that the test measurements are the response results from the same processing as the actual operation. Details of this embodiment are described below.

[0015] FIG. 1 is an explanatory diagram illustrating an example of a protection and control system test environment according to an embodiment of the present invention.

[0016] As shown in Fig. 1, a protection and control system for a digital substation is configured by connecting a protection and control device (IED) 101 and a merging unit (MU) 111 using a process bus 121, and communicating between devices in a distributed manner. Each part of this protection and control system is configured as follows:

[0017] The merging unit (MU) 111 takes in current and voltage signals from the analog input section 112, converts the current and voltage signals to digital data in the sampling processing section 113, creates transmission data in the communication control section 114, and outputs the transmission data. The transmission data is passed to the protection and control equipment (IED) 101 via the process bus 121. In the protection and control equipment (IED) 101, the communication control section 102 receives the data, the received data processing section 103 processes the received data, the protection calculation section 104 performs protection calculation, and issues a control command if a condition requires a control command. When a control command is to be issued, the transmission data processing section 105 creates transmission data and passes the control command from the communication control section 102 to the merging unit (MU) 111 via the process bus 121. The merging unit (MU) 111 performs reception data processing to extract control command information from the data received in the communication control section 114, passes the information to the input / output signal processing section 115 to perform input / output signal processing, and outputs a control command from the drive circuit section 116.

[0018] To test this protection and control system consisting of the protection and control device (IED) 101 and merging unit (MU) 111, a test device 131 equipped with a variable test output section 132 outputs test current and voltage signals and applies them to the analog input section 112 of the system. The current and voltage signal levels of the test output of the test device 131 are varied, and the control signal output in response to which the protection and control system responds is captured by a detection input section 133 of the test device 131 to test the relay operation.

[0019] The general data flow and the respective processing times will be described with reference to FIG.

[0020] FIG. 7 is a flowchart showing an example of processing in a protection and control system test environment according to an embodiment of the present invention.

[0021] The process flow in FIG. 7 is as described with reference to FIG.

[0022] Here, processing time T1 is the time required from the start (i.e., output of test current and voltage signals from test equipment 131) to the completion of signal acquisition process 701 by analog input section 112 of merging unit (MU) 111, sampling process 702 by sampling processing section 113, and transmission data output 703 by communication control section 114. Next, processing time T2 is the time required from the reception of data by protection and control equipment (IED) 101 to the completion of received data processing 704 by received data processing section 103, protection calculation processing 705 and judgment 706 by protection calculation section 104, and transmission data creation and output 707 by transmission data processing section 105, in addition to processing time T1. Finally, processing time T3 is the time required for the communication control unit 114 of the merging unit (MU) 111 to again receive data including a control command, perform received data processing 708, and for the input / output signal processing unit 115 and drive circuit unit 116 to perform input / output signal processing and output 709, and drive the switch, in addition to processing time T2.

[0023] FIG. 2 is an explanatory diagram showing an example of an actual operation test targeting the entire protection and control device (IED) 101 and merging unit (MU) 111 in a protection and control system test environment according to an embodiment of the present invention.

[0024] For example, the test device 131 may measure the time from when the test output unit 132 transmits the test current / voltage signal until the test output from the monitor output unit 143 is input to the detection input unit 133 as the processing time T2, and may measure the time from when the test output unit 132 transmits the test current / voltage signal until the output from the drive circuit unit 116 is input to the detection input unit 133 (or the time from when the test output unit 132 transmits the test current / voltage signal until the test output from the monitor output unit 117 is input to the detection input unit 133) as the processing time T3. These processing times can be used, for example, when an abnormality occurs in the protection and control system, to identify whether the abnormality is in the protection and control device (IED) 101 or the merging unit (MU) 111.

[0025] According to a signal flow as shown by a thick arrow 201 in FIG. 2, the system response result to the test output from the test device 131 is input to the detection input unit 133 of the test device 131 and observed to perform the test. EXAMPLES

[0026] A first embodiment of the present invention will be described with reference to Figures 3 and 4. The configuration of a system according to the first embodiment is similar to the systems shown in Figures 1, 2, and 7, unless otherwise specified below.

[0027] FIG. 3 is an explanatory diagram showing an example of a monitor operation test for the protection and control equipment (IED) 101 and the merging unit (MU) 111 in a protection and control system test environment according to the first embodiment of the present invention.

[0028] The test shown in FIG. 3 is performed by not outputting a control command from the actual drive circuit section 116, but by outputting a test output from a monitor output section 117 in a merging unit (MU) 111 having a drive circuit as a test output.

[0029] This is an embodiment that is implemented when the settings of the merging unit (MU) 111 are changed for testing, and testing can be performed using the monitor output unit 117 instead of driving the output of the drive circuit unit 116 connected to the switch.

[0030] In the configuration of FIG. 3, the control command output signal from the drive circuit section 116, which is the response result output of the merging unit (MU) 111, and the response result output from the monitor output section 117 are switched to be exclusive.

[0031] FIG. 4 is an explanatory diagram showing an example of a monitor operation test targeting only the protection and control device (IED) 101 in a protection and control system test environment according to the first embodiment of the present invention.

[0032] FIG. 4 shows an example of testing performed only on the protection and control equipment (IED) 101 in the configuration of FIG. 3 when the merging unit (MU) 111 is a product of another company, when it is an existing product and the settings cannot be changed for testing, or when it is not desired to change the settings for testing.

[0033] As shown in Figure 4, a test auxiliary device 141 is connected to the local output section 106 of the protection and control device (IED) 101, which outputs a control command output from the local output section 106, which is then output from the monitor output section 143 via the local input section 142 of the test auxiliary device 141, and the response result is captured by the detection input section 133 of the test device 131 to perform the test.

[0034] Here, the local output unit 106 has a function of outputting digital data of a protection control command based on the calculation result by the protection calculation unit 104 to the local input unit 142 of the test auxiliary device 141 via a local communication path different from the process bus 121. For example, the local output unit 106 may be composed of interface hardware connected to the local communication path and software that controls the interface.

[0035] The local input unit 142 of the test auxiliary device 141 receives digital data of a protection control command from the local communication path. The monitor output unit 143 generates a monitor signal based on the protection control command received by the local input unit 142 and outputs it as a test output. The monitor output unit 143 may be configured by hardware and software having the same functions as the monitor output unit 117 of the merging unit (MU) 111.

[0036] The monitor signal generated here is a signal input to a waveform measuring device (for example, an oscilloscope). This signal corresponds to the monitor signal that would be output from monitor output unit 117 if a protection control command based on the calculation result by protection calculation unit 104 was sent to merging unit (MU) 111 and merging unit (MU) 111 was operating normally. Comparison of these monitor signals can be used to separately test the operation of protection and control equipment (IED) 101 and merging unit (MU) 111.

[0037] In the case of the configuration in Fig. 4, the control command output, which is the response result output of the protection and control device (IED) 101, is either a control command output based on data from the communication control unit 102, or a control command output from the monitor output unit 143. By switching between these outputs exclusively, it is possible to prevent the control command output during the operation test from being output to the actual power system.

[0038] In this way, by connecting the operational outputs in each of the cases of Figures 3 and 4 to the detection input section 133 of the test equipment 131, it is possible to use the same test equipment to switch between each test, and to perform individual tests even if one side of the distributed system has constraints on the test setting conditions. EXAMPLES

[0039] A second embodiment will be described with reference to Figures 5 and 6. The configuration of the system according to the second embodiment is similar to the systems shown in Figures 1 to 4 and 7, unless otherwise specified below.

[0040] FIG. 5 is an explanatory diagram showing an example of internal processing of the protection and control device (IED) 101 in a protection and control system test environment according to the second embodiment of the present invention.

[0041] 5 is an internal processing block diagram of a portion that transfers output from the protection and calculation unit 104 of the protection and control device (IED) 101 to the local output unit 106 and the transmission data processing unit 105. In the second embodiment, unlike the first embodiment, the local output unit 106 and the transmission data processing unit 105 are not exclusive, but both are capable of output. In addition, a shared memory method is adopted for the internal relay portion that transfers signals. This ensures that the test operation is performed by referring to the same data in the shared memory 107.

[0042] FIG. 6 is an explanatory diagram showing an example of internal processing of the local output unit 106 of the protection and control device (IED) 101 in a protection and control system test environment according to the second embodiment of the present invention.

[0043] According to the second embodiment, a test can be performed to compare the test monitor output from the monitor output unit 143 of the protection and control device (IED) 101 with the test monitor output from the monitor output unit 117 of the merging unit (MU) 111, as shown in FIG.

[0044] Furthermore, the system according to the embodiment of the present invention may be configured as follows.

[0045] (1) A protection and control system having a merging unit (e.g., a merging unit (MU) 111) and a protection and control device (e.g., a protection and control device (IED) 101) connected to the merging unit via a communication network (e.g., a process bus 121), in which, when a signal indicating an electrical quantity in a power system is input, the merging unit converts the electrical quantity into digital data and outputs the digital data to the communication network, the protection and control device receives the digital data of the electrical quantity from the communication network and executes a protection and control calculation, and outputs a digital command according to the result of the protection and control calculation to the communication network, the merging unit receives the digital command and outputs a control command based on the digital command to equipment in the power system, and the protection and control device has a local output unit (e.g., a local output unit 106) that outputs the result of the protection and control calculation to a local communication path (e.g., a communication path between a local output unit 106 and a local input unit 142) different from the communication network.

[0046] This makes it possible to carry out operation tests on each unit, such as the merging unit and the protection and control device, in a distributed protection and control system device.

[0047] (2) The protection and control system described in (1) above further includes a test auxiliary device (e.g., test auxiliary device 141) connected to the local communication path, and the test auxiliary device generates and outputs a monitor signal to be input to a waveform measuring device (e.g., an oscilloscope) based on a result of the protection and control calculation (e.g., processing of the monitor output unit 143).

[0048] This makes it possible to carry out operational tests on each unit in a distributed protection and control system device.

[0049] (3) In the protection and control system described in (2) above, the test auxiliary device generates, as the monitor signal, the control command to be output when the merging unit receives a digital command corresponding to the result of the protection and control calculation.

[0050] This makes it possible to carry out operational tests on each unit in a distributed protection and control system device.

[0051] (4) A protection and control system as described in (3) above, wherein the protection and control device further has a shared memory (e.g., shared memory 107) for storing the result of the protection and control calculation, and outputs a digital command corresponding to the result of the protection and control calculation read from the shared memory to the communication network, and the local output unit outputs the result of the protection and control calculation read from the shared memory to the local communication path.

[0052] This ensures that the same data is used to test each unit.

[0053] (5) The protection and control system described in (4) above, further comprising a test device (e.g., test device 131), the test device comprising a test output unit (e.g., test output unit 132) that outputs a test signal indicating an electrical quantity of the power system, and a detection input unit (e.g., detection input unit 133) to which the control command and the monitor signal are input, and measures a first time (e.g., processing time T2) from the output of the test signal to the input of the monitor signal, and a second time (e.g., processing time T3) from the output of the test signal to the input of the control command.

[0054] This helps identify abnormal areas in the protection and control system.

[0055] The present invention is not limited to the above-mentioned embodiment, and various modifications are included. For example, the above-mentioned embodiment has been described in detail for better understanding of the present invention, and is not necessarily limited to those having all the configurations described. Also, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Also, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

[0056] In addition, the above-mentioned configurations, functions, processing units, processing means, etc. may be realized in part or in whole by hardware, for example, by designing them as integrated circuits. In addition, the above-mentioned configurations, functions, etc. may be realized in software by a processor interpreting and executing a program that realizes each function. Information such as a program, table, file, etc. that realizes each function can be stored in a storage device such as a non-volatile semiconductor memory, a hard disk drive, or an SSD (Solid State Drive), or in a computer-readable non-transitory data storage medium such as an IC card, an SD card, or a DVD.

[0057] In addition, the control lines and information lines are shown as those considered necessary for the explanation, and not all control lines and information lines in the product are shown. In reality, it can be considered that almost all components are connected to each other. [Explanation of symbols]

[0058] 101 Protection and Control Device (IED) 102 Communication control section 103 Received data processing unit 104 Protection calculation section 105 Transmission data processing unit 106 Local output section 107 Shared Memory 111 Merging Unit (MU) 112 Analog input section 113 Sampling processing section 114 Communication control section 115 Input / Output Signal Processing Section 116 Drive circuit section 117 Monitor output section 121 Process Bus 131 Test Equipment 132 Variable test output section 133 Detection input section 141 Testing Auxiliary Equipment 142 Local Input Section 143 Monitor output section

Claims

1. A protection and control system having a merging unit and a protection and control device connected to the merging unit via a communication network, When a signal indicating an amount of electricity in a power system is input, the merging unit converts the amount of electricity into digital data and outputs the digital data to the communication network; The protection and control device receives digital data of the electrical quantity from the communication network, executes a protection and control calculation, and outputs a digital command according to a result of the protection and control calculation to the communication network; The merging unit receives the digital command and outputs a control command based on the digital command to equipment of the power system; A protection and control system characterized in that the protection and control device has a local output unit that outputs the result of the protection and control calculation to a local communication path different from the communication network.

2. The protection and control system according to claim 1, a test assistant device connected to the local communication path; A protection and control system characterized in that the test auxiliary device generates and outputs a monitor signal to be input to a waveform measuring device based on a result of the protection and control calculation.

3. The protection and control system according to claim 2, A protection and control system characterized in that the test auxiliary device generates, as the monitor signal, the control command that is output when the merging unit receives a digital command corresponding to the result of the protection and control calculation.

4. The protection and control system according to claim 3, The protection and control device includes: A shared memory for storing a result of the protection and control calculation is further provided. outputting a digital command corresponding to the result of the protection and control calculation read from the shared memory to the communication network; A protection and control system characterized in that the local output unit outputs the result of the protection and control calculation read from the shared memory to the local communication path.

5. The protection and control system according to claim 4, Further comprising a test device; The test device comprises: a test output unit that outputs a test signal indicating an electric quantity of the power system, and a detection input unit to which the control command and the monitor signal are input, A protection and control system characterized by measuring a first time from when the test signal is output to when the monitor signal is input, and a second time from when the test signal is output to when the control command is input.

6. A protection and control method executed by a protection and control system, The protection and control system includes a merging unit and a protection and control device connected to the merging unit via a communication network, The protection and control method includes: a first step of, when a signal indicating an amount of electricity in a power system is input, converting the amount of electricity into digital data by the merging unit and outputting the digital data to the communication network; A second step in which the protection control device receives digital data of the electrical quantity from the communication network, executes a protection control calculation, and outputs a digital command according to a result of the protection control calculation to the communication network; A third step in which the protection control device outputs a result of the protection control calculation to a local communication path different from the communication network; A protection and control method comprising: a fourth step in which the merging unit receives the digital command and outputs a control command based on the digital command to equipment in the power system.

7. The protection and control method according to claim 6, The protection and control system further includes a test auxiliary device connected to the local communication path; The protection control method further includes a fifth step in which the test auxiliary device generates and outputs a monitor signal to be input to a waveform measuring device based on a result of the protection control calculation.

8. The protection and control method according to claim 7, In the fifth step, the test auxiliary device generates, as the monitor signal, the control command to be output when the merging unit receives a digital command corresponding to the result of the protection control calculation.

9. The protection and control method according to claim 8, The protection and control device further includes a shared memory for storing a result of the protection and control calculation, In the second step, the protection and control device outputs a digital command corresponding to the result of the protection and control calculation read from the shared memory to the communication network; The protection and control method, wherein in the third step, the protection and control device outputs the result of the protection and control calculation read from the shared memory to the local communication path.

10. The protection and control method according to claim 9, The protection and control system further includes a test device; the test device includes a test output unit that outputs a test signal indicating an electrical quantity of the power system, and a detection input unit to which the control command and the monitor signal are input, The protection and control method further includes a sixth step of measuring a first time from when the test signal is output to when the monitor signal is input by the test device, and a second time from when the test signal is output to when the control command is input.

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