A regional stability control testing system and method

Abstract

The application discloses a regional stability control test system and method, the system comprises a host computer and a plurality of test boxes in communication with the host computer, each test box is connected to an execution station device of a regional stability control system, the test boxes are synchronized through time signals; the host computer sends test parameters and channel parameters configured according to test requirements to corresponding test boxes; receives test results fed back by the test boxes, and generates a test report; the test boxes send test data to the connected execution station devices according to the test parameters and the channel parameters, and feed back test results fed back by the execution station devices to the host computer. The application can uniformly manage and synchronously control test data received by the execution station devices deployed in multiple stations through the host computer and the plurality of test boxes in communication with the host computer, can meet test requirements of a large regional stability control system, test data is configured according to test requirements, a test report is generated according to test results, a test closed loop is completed, the mode has low requirements on coordination and cooperation between stations and personnel skills, and can greatly reduce the workload of test personnel.

Description

Technical Field

[0001] This invention relates to a regional stability control testing system and method, belonging to the field of power grid safety and stability control system testing technology. Background Technology

[0002] As a key system in the second line of defense, the safety and stability control system is required to process power grid operation information in real time. Existing simulation testing equipment for safety and stability control devices is mainly for manual testing of single devices, which is limited in scope and cannot meet the testing needs of large-scale regional stability control systems. It also has limitations in simultaneously applying excitation to multiple devices distributed in different substations, especially during the commissioning and acceptance of large-scale regional stability control systems, where this method requires high levels of coordination between stations and skilled personnel. Summary of the Invention

[0003] This invention provides a regional stability control testing system and method, which solves the problems disclosed in the background art.

[0004] According to one aspect of this application, a regional stability control test system is provided, characterized in that it includes a host and a plurality of test boxes communicating with the host, each test box being connected to an execution station device of a regional stability control system, and the test boxes being synchronized by a time synchronization signal; The host will send the test parameters and channel parameters configured according to the test requirements to the corresponding test box; receive the test results fed back by the test box, and generate a test report; The test box sends test data to the connected execution station device according to the test parameters and channel parameters, and feeds back the test results from the execution station device to the host.

[0005] Furthermore, the test data includes stimuli, switching signals, and messages; The test box's message output terminal is connected to the execution station device's message receiving module; The excitation output terminal of the test box is connected to the analog input test interface of the actuator. The switch output terminal of the test box is connected to the input terminal of the DI module of the actuator. The common terminal of the test box is connected to the positive terminal of the input DC power supply, and the negative terminal of the input DC power supply is connected to the common terminal of the input DI module of the actuator. The test box's digital input terminal is connected to the trip output of the actuator.

[0006] Furthermore, the host is also connected to the stability control device of the regional stability control system, and obtains fault recording files through the stability control device.

[0007] Furthermore, the test boxes are connected to the host in series, or connected to the host in a bus topology.

[0008] Furthermore, the test box is synchronized via electrical B-code signals or optical B-code signals.

[0009] According to another aspect of this application, a regional stability control test method is provided, characterized in that it is implemented using the aforementioned regional stability control test system.

[0010] Furthermore, before testing, if analog sampling tests are to be performed on the device under test of the regional stability control system, the test parameters and excitation channel parameters are configured; if digital sampling tests are to be performed on the device under test of the regional stability control system, the test parameters and message channel parameters are configured; if other functional tests are to be performed on the device under test of the regional stability control system, the test parameters and switch channel parameters are configured.

[0011] Furthermore, if it is a low-frequency load reduction test, the test parameters include the frequency change step size and the first change amount characterizing the frequency change. After receiving the preset frequency change command, the host controls the first change amount to change according to the frequency change step size. For low-voltage load shedding tests, the test parameters include the voltage change step size and a second change quantity characterizing the voltage change. After receiving the preset voltage change command, the host controls the second change quantity to change according to the voltage change step size.

[0012] Furthermore, the testing method also includes the host extracting and interpolating the waveform data from the fault waveform file, and sending the interpolated waveform data as fault test parameters to the test box for fault playback.

[0013] The beneficial effects achieved by this invention are as follows: This invention uses a host computer and several test boxes that communicate with the host computer to uniformly manage and synchronously control the test data received by the execution station devices deployed in multiple plants. This can meet the testing needs of large-scale regional stability control systems. The test data is configured according to the test requirements, and a test report is generated based on the test results to complete the test closed loop. This method does not require high coordination between stations or high technical skills from personnel, and can greatly reduce the workload of test personnel. Attached Figure Description

[0014] Figure 1 A block diagram of the regional stability control test system; Figure 2 This is a flowchart of the system's internal processes during testing. Figure 3 This is a flowchart of the system's internal processes during fault playback. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application.

[0017] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0018] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0019] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0020] It should be noted that similar symbols and letters in the accompanying drawings represent similar items; therefore, once an item is defined in one accompanying drawing, it does not need to be discussed further in subsequent accompanying drawings.

[0021] See Figure 1 , Figure 1 This is a block diagram of a regional stability control testing system provided in an embodiment of this application. The system may include at least a host and several test boxes communicating with the host. Each test box is connected to an execution station device of the regional stability control system, and the test boxes are synchronized via a time synchronization signal. The host sends the test parameters and channel parameters configured according to the test requirements to the corresponding test box; receives the test results fed back by the test box and generates a test report; the test box sends test data to the connected execution station device according to the test parameters and channel parameters, and feeds back the test results fed back by the execution station device to the host.

[0022] It should be noted that the host can be a common smart terminal; in this case, a PC is used, which communicates with the test box via Ethernet.

[0023] In some embodiments, the host computer can also connect to the communication interface of the stability control device in the regional stability control system to obtain fault recording files through the stability control device. The fault recording file is a standardized data file recording various electrical quantities and the actions of the stability control device when a fault / disturbance occurs in the regional power grid. It is a COMTRADE format recording file, which can be used for post-event analysis to determine whether the stability control action logic is correct and to locate the root cause of the power grid fault. The host computer processes the recording file to obtain test parameters for fault playback, enabling fault playback and thus reproducing the fault scenario. This allows for accurate verification of the stability control strategy and device action logic, providing a basis for subsequent strategy optimization and significantly improving the safety and stability of the regional power grid.

[0024] It should be noted that the test box mainly consists of a control board. The control board only needs to be able to generate test data, and it can adopt a CPU+FPGA architecture. The test box can be configured with one or two network ports, and then connected to the host via a twisted-pair network cable. Alternatively, a bus topology can also be used to connect to the host.

[0025] The test data mainly includes excitation, switching signals, and messages. Excitation can be a low-voltage AC signal (0-10VAC sine wave), and messages can be FT3 communication messages (editable FT3 communication messages), IEC61850-9-2 messages, etc. The message output of the test box can be connected to the message receiving module of the actuator via a single-mode fiber optic cable. The excitation output of the test box can be connected to the analog input test interface of the actuator via a flat cable. The switching output of the test box can be connected to the input terminals of the DI module of the actuator via DCC power test cables. The common terminal of the test box's switching signal is connected to the positive terminal of the input DC power supply, and the negative terminal of the input DC power supply is connected to the common input terminal of the DI module of the actuator. The switching input of the test box can be connected to the trip output of the actuator via DCC power test cables, mainly used to receive the actuator's action output signals and record the test results.

[0026] In some embodiments, the test boxes can be synchronized via electrical B-code signals or optical B-code signals, so that the synchronization accuracy between each test box is less than 1μs. There is no master-slave distinction between the test boxes, and the distribution of test parameters and the collection of test data are all managed and controlled by the host system.

[0027] The aforementioned system uses a host computer and several test boxes that communicate with the host computer to uniformly manage and synchronously control the test data received by the actuators deployed in multiple plants. It can meet the testing needs of large-scale regional stability control systems. The test data is configured according to the test requirements, and a test report is generated based on the test results to complete the test closed loop. This method does not require high coordination between stations or high technical skills from personnel, and it can greatly reduce the workload of test personnel.

[0028] This application also provides a regional stability control testing method, specifically using the above-mentioned system to conduct regional stability control testing. The specific testing process can be as follows: 1) Connect the above system with all devices powered off, and then power on all devices after the connection is complete.

[0029] 2) Start the host's built-in management and control system. Each test box completes initialization. After initialization, the test box automatically establishes a communication connection with the host. For test boxes that fail to establish a normal connection with the host, perform fault diagnosis operations by checking the physical connection status of the network cable, whether the network port status indicator lights of the test box are normal, and checking the connectivity of the IP address using the ping command. If this is the first test, the test environment and hardware environment need to be configured. If they have already been configured (i.e., not the first test), simply import the configuration.

[0030] 3) Configure test parameters and channel parameters according to requirements, generate test data based on test parameters and channel parameters, execute tests, and generate test reports based on test results.

[0031] It should be noted that before testing, if analog sampling tests are performed on the device under test (DUT) of the regional stability control system, the test parameters and excitation channel parameters should be configured. This configuration result can be saved and opened as a .sync file. If digital sampling tests are performed on the DUT of the regional stability control system, the test parameters and message channel parameters should be configured. If other functional tests are performed on the DUT of the regional stability control system, such as control strategy table, low-frequency load shedding, low-voltage load shedding, high-frequency overvoltage switching, or disconnection, the test parameters and switching channel parameters should be configured. This configuration can be saved and opened as a .tplxml file. Specifically, the switching channel parameter configuration can be for the input and output ports, the message channel parameter configuration can be for the message output ports, and the excitation channel parameter configuration can be for the turns ratio of the excitation output channel. Test parameters can include voltage and current amplitude, phase angle, frequency, rate of change, slip, etc.

[0032] See also Figure 2The PC (host) configures the amplitude, frequency, phase angle, rate of change, and channel parameters, and sends this information to the test box via Ethernet. Based on this information, the test box calculates the sampling value of 80 points per cycle and converts it from D / A converter to excitation output or SMV output in IEC61850-9-2 message format. Simultaneously, it drives the opening and closing of the switching terminals according to the switch quantity configuration. For example, when the analog data is set to a primary-side electrical quantity, such as 1250A current or 220kV voltage, it will be converted to a secondary value according to the turns ratio. When the data edited in the analog test is a secondary-side electrical quantity, such as 2A current or 57.7V voltage, no conversion is needed. After receiving the test data, the CPU of the test box only needs to distinguish between instantaneous and effective values. If it is an effective value, it should be converted to an instantaneous value. The CPU of the test box writes the digital value of the instantaneous value into RAM for the FPGA to read.

[0033] In some embodiments, if it is a low-frequency load shedding test, the test parameters include a frequency change step size and a first change amount characterizing the frequency change. After receiving a preset frequency change command, the host controls the first change amount to change according to the frequency change step size. If it is a low-voltage load shedding test, the test parameters include a voltage change step size and a second change amount characterizing the voltage change. After receiving a preset voltage change command, the host controls the second change amount to change according to the voltage change step size.

[0034] For example, when selecting system frequency (i.e., low-frequency load shedding), select the output channel to be changed as the variable, and set the step size to "0.1". Each click of the "+" sign with the mouse or using the shortcut key "↑" will increase the system frequency by 0.1 Hz; each click of the "-" sign with the mouse or using the shortcut key "↑" will decrease the system frequency by 0.1 Hz. At this point, a low-frequency load shedding test can be performed. When the system frequency drops to 49.5 Hz, the low-frequency load shedding device starts, continuing to decrease to one output setpoint, then another output action. This process is repeated until all rounds of action are completed to verify that the low-frequency load shedding function is normal. When selecting voltage amplitude (i.e., low-voltage load shedding), select the output channel to be changed as the variable, and set the step size to "1". Each click of the "+" sign with the mouse or using the shortcut key "↑" will increase the voltage by 1V; each click of the "-" sign with the mouse or using the shortcut key "↑" will decrease the output voltage by 1V. At this point, a low-voltage load shedding test can be performed. When the output voltage drops to the low-voltage start-up threshold, the low-voltage shearing device starts and continues to drop to the output setpoint for one round, with one round of output action. After verifying the action of all rounds, it is proven that the low-voltage shearing function is normal. Based on the above operation, experiments can be conducted according to the power setpoint of a certain round. By verifying all rounds in sequence, the overload function of the regional stability control system can be verified.

[0035] In some embodiments, if the host receives a fault waveform file, it will record and interpolate the fault waveform file, and send the interpolated waveform data as fault test parameters to the test box for fault playback. The waveform data includes channel configuration data, sampling time point array (relative or absolute time), instantaneous value sequence of each analog channel, state sequence of each digital channel, and basic information (such as plant, equipment, sampling rate, rated frequency, trigger time, etc.) involved in the entire process of power system disturbance. The above data is linearly interpolated and coordinate transformed and then used as the source of test parameter input to complete the fault playback process. The linear interpolation algorithm calculates the data at each intermediate point, mainly to solve the problem of mismatch between the sampling rate of the fault waveform file and the output rate of the test instrument, while ensuring waveform smoothness and accuracy and ensuring accurate device response.

[0036] See also Figure 3 The fault waveform file is imported into the management and control system on the PC. The next minute's data is calculated using an interpolation resampling algorithm (80 output points per waveform, binary format), and downloaded sequentially to the corresponding test boxes. The test boxes read the data and convert it into excitation output or SMV output in IEC61850-9-2 message format via D / A converter. This method allows for simultaneous downloading and analog output, and can play back large fault waveform files.

[0037] This provides efficient and convenient testing methods for regional stability control systems, which can reduce personnel requirements, simplify the work process, and improve testing efficiency.

[0038] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A regional stability control testing system, characterized in that, It includes a host computer and several test boxes that communicate with the host computer. Each test box is connected to an execution station device of a regional stability control system. The test boxes are synchronized by a time signal. The host will send the test parameters and channel parameters configured according to the test requirements to the corresponding test box; Receive test results from the test box and generate a test report; The test box sends test data to the connected execution station device according to the test parameters and channel parameters, and feeds back the test results from the execution station device to the host.

2. The system according to claim 1, characterized in that, Test data includes stimuli, switching signals, and messages; The test box's message output terminal is connected to the execution station device's message receiving module; The excitation output terminal of the test box is connected to the analog input test interface of the actuator. The switch output terminal of the test box is connected to the input terminal of the DI module of the actuator. The common terminal of the test box is connected to the positive terminal of the input DC power supply, and the negative terminal of the input DC power supply is connected to the common terminal of the input DI module of the actuator. The test box's digital input terminal is connected to the trip output of the actuator.

3. The system according to claim 1, characterized in that, The host is also connected to the regional stability control system's control device, which obtains fault recording files.

4. In the system according to claim 1, the test box is connected to the host in series, or connected to the host in a bus topology.

5. The system according to claim 1, characterized in that, The test box is synchronized via electrical B-code signal or optical B-code signal.

6. A regional stability control test method, characterized in that, The system described in any one of claims 1 to 5 shall be used.

7. The method according to claim 6, characterized in that, The system is the system described in claim 2; Before testing, if the analog sampling test of the device under test in the regional stability control system is to be performed, the test parameters and excitation channel parameters should be configured. If the digital sampling test of the device under test in the regional stability control system is to be performed, the test parameters and message channel parameters should be configured. If other functional tests of the device under test in the regional stability control system are to be performed, the test parameters and switch channel parameters should be configured.

8. The method according to claim 7, characterized in that, If it is a low-frequency load reduction test, the test parameters include the frequency change step size and the first change amount characterizing the frequency change. After receiving the preset frequency change command, the host controls the first change amount to change according to the frequency change step size. For low-voltage load shedding tests, the test parameters include the voltage change step size and a second change quantity characterizing the voltage change. After receiving the preset voltage change command, the host controls the second change quantity to change according to the voltage change step size.

9. The method according to claim 6, characterized in that, The system is the system described in claim 3; The testing method also includes, The host extracts and interpolates the waveform data from the fault waveform file, and sends the interpolated waveform data as fault test parameters to the test box for fault playback.

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