Low-voltage transformer area semi-physical simulation model, modeling method and simulation method

Abstract

The invention belongs to the technical field of power system simulation, and discloses a low-voltage transformer area semi-physical simulation model, a modeling method and a simulation method.A simulation environment is constructed based on a topological structure, a function and a transmission protocol of real equipment, and the actual working state of a low-voltage transformer area can be simulated more accurately. Compared with the problems of environment interference, equipment failure or data loss and the like possibly encountered in field testing, the simulation environment can ensure the accuracy and reliability of data, and a stable experiment result is provided. Various operation states including extreme working conditions, equipment faults or load fluctuation and the like can be simulated in a virtual environment. In this way, the performance and stability of the transformer area can be evaluated more comprehensively, and potential problems can be recognized in advance. According to the invention, frequent on-site installation and debugging are not needed, so that the labor cost and time consumption required by on-site testing are greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system simulation, and in particular relates to a low-voltage station area semi-physical simulation model, a modeling method and a simulation method. Background Art

[0002] With the continuous development of smart grids, low-voltage substations, as a key component of the power system, bear a large number of power distribution and load regulation tasks. The stability and operating efficiency of low-voltage substations directly affect the reliability and performance of the entire power grid. Traditional low-voltage substation testing methods mostly rely on on-site installation and debugging, which not only requires a lot of manpower and material resources, but also has problems such as long cycle, high cost, and difficulty in flexible adjustment. Moreover, in a complex power environment, the results of on-site tests may be affected by many factors, resulting in inaccurate data collection and the inability of experiments to fully cover different operating states, increasing risks and uncertainties. Therefore, with the advancement of technology, especially the rapid development of simulation technology, it is particularly important to develop an efficient, flexible, and low-cost low-voltage substation simulation method. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of inaccurate data collection due to field testing and the inability of experiments to fully cover different operating states, and to provide a low-voltage area semi-physical simulation model, modeling method and simulation method.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a low voltage area semi-physical simulation modeling method, comprising the following steps: Obtain the topology, functions and transmission protocols of real equipment in the low-voltage area; Build a low-voltage area simulation environment based on the topology, functions and transmission protocols of real equipment; Based on the constructed low-voltage area simulation environment, establish the front-end display system and back-end numerical control system; Combine the front-end display system, the back-end numerical control system and the low-voltage area simulation environment to complete the semi-physical simulation model of the low-voltage area.

[0005] A further improvement of the present invention is that the topological structure of the real equipment in the low-voltage area includes the corresponding relationship between the total meter, multi-function meter and single-phase meter in the low-voltage area and the low-voltage intelligent leakage protection switch, phase change switch and intelligent micro-break switch.

[0006] A further improvement of the present invention is that the functions of the real equipment in the low-voltage area include the operating characteristics of the low-voltage intelligent leakage protection switch, the phase-changing switch and the intelligent micro-break switch.

[0007] A further improvement of the present invention is that the transmission protocols for obtaining real devices in the low-voltage area include 698 communication protocols and 645 communication protocols.

[0008] A further improvement of the present invention is that when establishing the front-end display system and the back-end numerical control system, the front-end display system and the back-end numerical control system are developed separately.

[0009] In a second aspect, the present invention provides a low voltage area semi-physical simulation model, comprising: The back-end numerical control system is used to input numerical control data of the low-voltage area simulation environment and send the numerical control data to the low-voltage area simulation environment; The low-voltage area simulation environment is used to obtain simulation output data based on the received numerical control data, according to the topology, function and transmission protocol of the built-in real equipment, and send the simulation output data to the front-end display system; The front-end display system is used to display the received simulation output data.

[0010] A further improvement of the present invention is that the back-end numerical control system is connected to a message publish / subscribe transmission protocol server, and the message publish / subscribe transmission protocol server is used to obtain real data of the low-voltage area and send the real data to the back-end numerical control system.

[0011] In a third aspect, the present invention provides a simulation method for a low-voltage area semi-physical simulation model, comprising the following steps: Receive the numerical control data of the low-voltage area simulation environment and parse the numerical control data into control information and data information; According to the control information, the corresponding built-in topology structure, function and transmission protocol are retrieved to form a simulation model; The data information is sent into the simulation model to obtain the required simulation output data for display.

[0012] A further improvement of the present invention is that when receiving the numerical control data of the low-voltage area simulation environment, data of the message publishing / subscribing transmission protocol server is obtained as the numerical control data of the low-voltage area simulation environment.

[0013] A further improvement of the present invention is to obtain data from a message publish / subscribe transport protocol server, which obtains real data from the low-voltage area and uses the real data from the low-voltage area as numerical control data for the low-voltage area simulation environment.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The simulation environment of the present invention is constructed based on the topological structure, function and transmission protocol of the real device, and can simulate the actual working state of the low-voltage area more accurately. Compared with the problems such as environmental interference, equipment failure or data loss that may be encountered in field testing, the simulation environment can ensure the accuracy and reliability of the data and provide stable experimental results. The present invention can simulate various operating states in a virtual environment, including extreme working conditions, equipment failure or load fluctuations. In this way, the present invention can more comprehensively evaluate the performance and stability of the area and identify potential problems in advance. The present invention does not require frequent field installation and debugging, thereby greatly reducing the labor cost and time consumption required for field testing. The simulation environment can be flexibly adjusted to quickly simulate a variety of working conditions, and the simulation environment has a high degree of repeatability, and multiple tests can be performed for different scenarios to analyze the impact of different parameters on system operation. In summary, the low-voltage area semi-physical simulation modeling method of the present invention can effectively overcome the shortcomings in field testing, improve data accuracy and experimental comprehensiveness, and has significant cost-effectiveness, risk control and optimization support capabilities, which is of great practical significance to the construction and operation of the power system.

[0015] The back-end numerical control system of the present invention is responsible for inputting the numerical control data required for the low-voltage area simulation environment and sending it to the simulation environment. This makes the entire data input process highly accurate, avoiding measurement errors caused by environmental interference or equipment failure in field tests. The automation and digital processing of the numerical control system reduces the inaccuracy caused by manual intervention and improves the reliability of the data. The low-voltage area simulation environment has built-in topological structures, functions and transmission protocols of real equipment, and can simulate various operating conditions according to different input data. The flexibility of the simulation environment allows multiple adjustments and repeated experiments for different scenarios, and these tests can be completed quickly on the simulation platform without being subject to the physical limitations of the actual equipment. The present invention can simulate and evaluate various potential risks and failure modes in the simulation environment, so as to discover and solve problems in advance. In summary, the low-voltage area semi-physical simulation model of the present invention effectively overcomes many deficiencies in field testing through accurate data input, flexible working condition simulation and real-time data feedback, and has significant advantages, including improving data accuracy, comprehensively covering different operating states, reducing testing costs, improving experimental efficiency and safety, and other beneficial effects.

[0016] The numerical control data of the present invention is converted into control information and data information after parsing, and the data processing process is more accurate and automated, reducing the errors that may be caused by manual intervention, thereby improving the accuracy and consistency of data acquisition. The simulation environment of the present invention is digital, not affected by external environmental factors, and can ensure the stability of the environment and equipment during the test process, so as to obtain more reliable and consistent simulation output data. The present invention can quickly call different topological structures, functions and transmission protocols according to different needs to simulate various complex power grid conditions. This allows the experiment to be easily adjusted, the simulation parameters to be quickly changed, and repeated tests of multiple scenarios to be performed. In summary, the simulation method of the semi-physical simulation model of the low-voltage substation can not only effectively improve the accuracy of data acquisition, but also comprehensively cover various operating states, avoid the interference of uncontrollable factors in field tests, enhance the flexibility and repeatability of the experiment, reduce the test cost, improve the experimental efficiency, optimize the substation design and operation strategy, and improve the safety during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of a method for semi-physical simulation modeling of low-voltage area; Figure 2 It is a system diagram of a semi-physical simulation model of a low-voltage area; Figure 3 The present invention is a flow chart of a simulation method for a semi-physical simulation model of a low-voltage station area. DETAILED DESCRIPTION

[0018] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0019] Embodiment 1: See also Figure 1 A low voltage area semi-physical simulation modeling method comprises the following steps: S1, obtain the topology, functions and transmission protocols of real devices in the low-voltage area.

[0020] S2, builds a low-voltage area simulation environment based on the topology, functions and transmission protocols of real equipment.

[0021] S3, based on the constructed low-voltage area simulation environment, establish the front-end display system and back-end CNC system.

[0022] S4, combines the front-end display system, the back-end numerical control system and the low-voltage area simulation environment to complete the semi-physical simulation model of the low-voltage area.

[0023] Embodiment 2: A low voltage area semi-physical simulation modeling method comprises the following steps: Step 1: Assume that the low-voltage substation contains a total meter, several multi-function meters, and multiple single-phase meters. The total meter is used to monitor the power consumption of the entire substation, the multi-function meter is used to monitor the power consumption of each branch line, and the single-phase meter is used to monitor the power consumption of a single device. There is a clear correspondence between these meters and the low-voltage intelligent leakage protection switch, phase change switch, and intelligent micro-break switch, and each device has different functions and working characteristics.

[0024] Low-voltage intelligent leakage protection switches are mainly used to detect leakage in circuits and disconnect the circuit when leakage occurs; phase-changing switches are used to switch current phases to ensure the normal operation of power equipment; intelligent micro-breaker switches have functions such as overload protection and short-circuit protection, which can cut off the circuit in time to prevent equipment damage.

[0025] The 698 communication protocol and the 645 communication protocol are used to realize the communication between various devices. The 698 protocol is mainly used for data transmission between intelligent devices, while the 645 protocol is used for command transmission between devices and control systems to ensure the accurate flow of information and the normal operation of the equipment.

[0026] Step 2: A virtual low-voltage substation environment is constructed through digital modeling tools, which contains the topological relationship of all actual devices. The topological relationship is the connection relationship between the total meter, multi-function meter, single-phase meter and various switches. Each device is given corresponding functional characteristics, such as the leakage detection function of the intelligent leakage protection switch and the switching function of the phase change switch. The transmission protocol ensures effective communication and data exchange between different devices.

[0027] Step 3: The front-end system is responsible for displaying the operating status of each device in the low-voltage area in real time, including power consumption, fault information, switch status, etc. Through the graphical interface, users can intuitively see the power flow of the entire area and the working status of each device. The front-end system not only supports multiple display forms, such as charts, digital instruments, etc., but also has fault alarm and status prompt functions.

[0028] The back-end numerical control system is mainly used to control and adjust various types of equipment in the low-voltage area. The back-end numerical control system can receive instructions from the front-end display system, send control signals, and adjust the working mode of the equipment. The back-end numerical control system is deeply integrated with the simulation environment and can adjust the equipment status, simulate faults, or switch to different operating conditions according to the simulation data.

[0029] Step 4: Combine the front-end display system, the back-end numerical control system and the low-voltage area simulation environment to complete the semi-physical simulation model of the low-voltage area.

[0030] Through the collaborative work of the front-end display system and the back-end CNC system, combined with the simulation environment of the low-voltage area, a complete semi-physical simulation model is formed. The semi-physical simulation model can respond to CNC instructions in real time and simulate different grid states in the simulation environment. For example, it can simulate the leakage protection function of the intelligent leakage protection switch, simulate the current phase switching of the phase-changing switch, or simulate the overload protection process of the micro-breaker.

[0031] Assume that the load of the substation monitored by the total meter in the simulation environment is 50kW, and multiple multi-function meters and single-phase meters monitor the load of each branch respectively. The front-end display system displays the power consumption data of each branch in real time. For example, the multi-function meter consumes 10kW as the first branch, and the single-phase meter consumes 5kW as the second branch. The remaining load is borne by other branches. During the simulation process, if a branch is short-circuited or overloaded, the back-end CNC system will send a command to the corresponding intelligent micro-break switch to immediately cut off the circuit. The front-end display system displays the fault status of the branch in real time and generates an alarm message to prompt the operator.

[0032] In the actual application of smart grid, this low-voltage substation semi-physical simulation model can be used for substation fault diagnosis, load forecasting and system optimization. Engineers can use the simulation system to simulate the performance of low-voltage substations under different conditions such as load fluctuations and equipment failures in advance, thereby providing decision support for substation design, maintenance and intelligent scheduling.

[0033] Embodiment 3: See also Figure 2 , a semi-physical simulation model of a low-voltage area, comprising: The back-end numerical control system is used to input numerical control data of the low-voltage area simulation environment and send the numerical control data to the low-voltage area simulation environment; The low-voltage area simulation environment is used to obtain simulation output data based on the received numerical control data, according to the topology, function and transmission protocol of the built-in real equipment, and send the simulation output data to the front-end display system; The front-end display system is used to display the received simulation output data.

[0034] Embodiment 4: A semi-physical simulation model of a low-voltage station area, comprising: The back-end numerical control system is used to receive and process the numerical control data of the low-voltage area simulation environment and send the processed data to the simulation environment. It is also connected to a message publish / subscribe transmission protocol server to obtain the real data of the low-voltage area through the protocol and send the real data to the back-end numerical control system for further processing and simulation.

[0035] The low-voltage area simulation environment is used to generate simulation output data based on the CNC data received from the back-end CNC system, combined with the built-in device topology, functions and transmission protocols, and feed the results back to the front-end display system.

[0036] The front-end display system is used to display the data output by the low-voltage area simulation environment, including equipment status, fault alarm, power consumption and other information.

[0037] Assume that the low voltage area consists of a master meter and multiple sub-meters, including multi-function meters and single-phase meters. The task of the back-end CNC system is to obtain the status and data of these devices in real time, and interact with the simulation environment through the message publish / subscribe transmission protocol server.

[0038] The real-time data of the total meter is: total load 50 kW, voltage 220 V, current 230 A. The load data displayed by a single-phase meter as a sub-meter is: branch load 10 kW, voltage 220 V, current 45 A.

[0039] The back-end numerical control system obtains the real data of each device in the substation through the message publishing / subscribing transmission protocol server. The data of the low-voltage substation received by the message publishing / subscribing transmission protocol server includes: Summary table: Power consumption 50 kWh, current 230 A, voltage 220 V; Single-phase meter: power consumption 10 kWh, current 45 A, voltage 220 V; Intelligent leakage protection switch: The current working status is normal, the leakage value is 0 mA, and the historical fault record is empty.

[0040] Phase-changing switch: The current state is switching phase 2, operating normally, and there is no fault.

[0041] These data are transmitted to the back-end CNC system through the publish / subscribe protocol server, and the back-end system adjusts the simulation environment of the workstation according to these real-time data.

[0042] Based on the real equipment data received, such as the load data of the total meter and the load data of the single-phase meter, the low-voltage area simulation environment starts simulation calculations according to the topology and functions of the built-in devices. For example, when the total meter shows a load of 50 kW, the simulation environment calculates the load distribution of each sub-meter and possible load fluctuations.

[0043] If the simulation environment detects that a branch is overloaded, such as a single-phase meter load exceeding 10 kW, the system will determine whether to trigger the power-off protection mechanism based on the device function and simulate the process of the intelligent micro-breaker cutting off the circuit.

[0044] The front-end display system displays the status of each device in the low-voltage area in real time through the received simulation output data: Total meter: displays the total load (e.g. 50 kW), current (230 A), and voltage (220 V) of the substation in real time.

[0045] Single-phase meter: displays the load, current, voltage and other data of each branch.

[0046] Fault alarm: If the simulation environment detects that a device has a fault, the front-end display system will display the fault type in real time and highlight it on the interface.

[0047] Embodiment 5: See also Figure 3 A simulation method for a low voltage area semi-physical simulation model comprises the following steps: The first step is to receive the numerical control data of the low-voltage area simulation environment and parse the numerical control data into control information and data information.

[0048] The second step is to call up the corresponding built-in topology structure, function and transmission protocol according to the control information to form a simulation model.

[0049] The third step is to send the data information into the simulation model to obtain the required simulation output data for display.

[0050] Embodiment 6: A simulation method for a low voltage area semi-physical simulation model comprises the following steps: Step 1, receiving numerical control data of the low-voltage area simulation environment, and parsing the numerical control data into control information and data information; During this simulation process, the backend CNC system receives the following CNC data: Total table data: load 50 kW, current 230 A, voltage 220 V.

[0051] Multi-function meter data, as branch 1: load 10 kW, current 45 A, voltage 220 V.

[0052] Intelligent leakage protection switch status: working status is normal, leakage value is 0 mA.

[0053] Phase-changing switch status: The current switching phase is phase 1, and it is working normally.

[0054] The control information includes the working status of each device, specifically the phase switching of the phase-changing switch, the protection status of the intelligent leakage protection switch, etc. The data information includes the load, current and voltage data of each meter.

[0055] Step 2: According to the control information, the corresponding built-in topology structure, function and transmission protocol are retrieved to form a simulation model.

[0056] According to the parsed control information, the simulation system retrieves the specific functions, topological structures and transmission protocols of each device in the low-voltage area. The equipment connection in the low-voltage area is that the main meter is connected to multiple branches, and the power consumption of each branch is monitored by multi-function meters and single-phase meters. Each branch is controlled by different types of switches, including intelligent leakage protection switches, phase-changing switches, micro-break switches, etc.

[0057] The functions of each device are as follows: The total meter is used to monitor the overall load and current and voltage of the substation.

[0058] Multifunctional meter for monitoring energy consumption in specific branches.

[0059] Intelligent leakage protection switch, used for leakage protection, is in normal working state.

[0060] The phase-changing switch is used to switch the current phase, and the current phase is phase 1.

[0061] Intelligent micro-breaker switch, used for current overload protection, the current status is normal.

[0062] Data transmission between devices is carried out through the 698 communication protocol and the 645 communication protocol, ensuring smooth data communication between devices and real-time feedback of the system.

[0063] Based on this information, a digital model of the low-voltage substation is generated, which includes the working characteristics, topological relationships, communication protocols and data flows of all equipment.

[0064] Step three, the data information is sent to the semi-physical simulation model of the low-voltage area to obtain the required simulation output data for display.

[0065] After the data information is sent to the low-voltage area semi-physical simulation model, the low-voltage area semi-physical simulation model starts to calculate and generate simulation output data. The low-voltage area semi-physical simulation model generates the working status data of each device based on the input data information (load, current, voltage, etc.) and control information (such as the working status of the intelligent leakage protection switch and the phase switching of the phase-changing switch). For example: Total meter: shows total load is 50 kW, voltage is 220 V, current is 230 A.

[0066] Multifunction meter for branch 1: displays load 10 kW, voltage 220 V, current 45 A.

[0067] Intelligent leakage protection switch: The working status is "normal", the leakage value is 0 mA, and the protection is not triggered.

[0068] Phase-changing switch: The current phase is switched to "Phase 1" and works normally.

[0069] The semi-physical simulation model of the low-voltage area will make real-time adjustments and feedback to the simulation environment according to the control instructions (such as the phase switching of the phase-changing switch). If the system detects an abnormal load (such as a branch load is too high), the intelligent micro-break switch will simulate the triggering and disconnect the circuit.

[0070] The front-end display system will display these simulation output data in real time, show the power flow status of the substation, and display the working status of each device through a graphical interface. For example: The total power consumption of the meter is: 50 kW, current 230 A, voltage 220 V.

[0071] Current and voltage data of each branch table (for example: branch 1 load 10 kW, current 45 A, voltage 220 V).

[0072] The status of the intelligent leakage protection switch: working normally, the leakage value is 0 mA.

[0073] In conclusion, the semi-physical simulation model of the low-voltage substation can accurately analyze and generate control information and data information after receiving the numerical control data. Based on these data, the simulation system builds a digital simulation model, which can monitor the substation load and equipment status in real time, and generate simulation output based on the input data, and finally provide real-time feedback through the front-end display system. This simulation method can effectively improve the monitoring, fault warning and load optimization functions of the low-voltage substation, and has high practical value.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A low voltage area semi-physical simulation modeling method, characterized in that: The following steps are involved: Obtain the topology, functions and transmission protocols of real equipment in the low-voltage area; Build a low-voltage area simulation environment based on the topology, functions and transmission protocols of real equipment; Based on the constructed low-voltage area simulation environment, establish the front-end display system and back-end numerical control system; Combine the front-end display system, the back-end numerical control system and the low-voltage area simulation environment to complete the semi-physical simulation model of the low-voltage area.

2. A low voltage area semi-physical simulation modeling method according to claim 1, characterized in that: The topological structure of the real equipment in the low-voltage substation includes the corresponding relationship between the total meter, multi-function meter and single-phase meter in the low-voltage substation and the low-voltage intelligent leakage protection switch, phase change switch and intelligent micro-break switch.

3. A low voltage area semi-physical simulation modeling method according to claim 1, characterized in that: The functions of the real equipment in the low-voltage area include the operating characteristics of low-voltage intelligent leakage protection switches, phase-changing switches and intelligent micro-break switches.

4. A low voltage area semi-physical simulation modeling method according to claim 1, characterized in that: The transmission protocols for obtaining real devices in the low-voltage area include 698 communication protocol and 645 communication protocol.

5. A low voltage area semi-physical simulation modeling method according to claim 1, characterized in that: When establishing the front-end display system and the back-end numerical control system, develop the front-end display system and the back-end numerical control system separately.

6. A semi-physical simulation model of a low-voltage area, characterized in that: include: The back-end numerical control system is used to input numerical control data of the low-voltage area simulation environment and send the numerical control data to the low-voltage area simulation environment; The low-voltage area simulation environment is used to obtain simulation output data based on the received numerical control data, according to the topological structure, function and transmission protocol of the built-in real equipment, and send the simulation output data to the front-end display system; The front-end display system is used to display the received simulation output data.

7. A low voltage area semi-physical simulation model according to claim 6, characterized in that: The back-end numerical control system is connected to a message publishing / subscribing transmission protocol server, which is used to obtain the real data of the low-voltage area and send the real data to the back-end numerical control system.

8. A simulation method for a low voltage area semi-physical simulation model, characterized in that: The following steps are involved: Receive the numerical control data of the low-voltage area simulation environment and parse the numerical control data into control information and data information; According to the control information, the corresponding built-in topology structure, function and transmission protocol are retrieved to form a simulation model; The data information is sent into the simulation model to obtain the required simulation output data for display.

9. The simulation method of a low voltage area semi-physical simulation model according to claim 8, characterized in that: When receiving the numerical control data of the low-voltage area simulation environment, the data of the message publishing / subscribing transmission protocol server is obtained as the numerical control data of the low-voltage area simulation environment.

10. The simulation method of a low voltage area semi-physical simulation model according to claim 9, characterized in that: The data of the message publishing / subscribing transport protocol server is obtained. The message publishing / subscribing transport protocol server obtains the real data of the low-voltage area and uses the real data of the low-voltage area as the numerical control data of the low-voltage area simulation environment.

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