Steam turbine mechanism simulation platform
By building a steam turbine mechanism simulation platform, including interface switching, virtual simulation and modeling subsystems, the problem that the existing steam turbine simulation platform cannot fully simulate the overall influencing factors of nuclear power steam turbines is solved, and efficient simulation and high-speed response are achieved.
Patent Information
- Application Number
- CN202510677961.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-09-12
AI Technical Summary
The existing steam turbine model simulation platform is difficult to fully simulate the overall influencing factors of nuclear power steam turbines during verification and testing, and the simulation model built based on the existing mechanism cannot meet the high-speed response requirements.
A steam turbine mechanism simulation platform was designed, which included an interface switching subsystem, a virtual simulation subsystem, a modeling subsystem, and a control subsystem. A virtual model of the steam turbine unit was constructed through these subsystems, and the interface switching subsystem was used to access the test or preset control program to realize the simulation of the nuclear power steam turbine control system.
It improves the authenticity and simulation range of nuclear power steam turbine simulation, can simulate the full process control and transient operating conditions of the steam turbine unit, shortens the simulation response cycle, and enhances the accuracy of test verification.
Smart Images
Figure CN120630751A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of nuclear power steam turbine simulation, and in particular to a steam turbine mechanism simulation platform. Background Art
[0002] Most existing turbine model simulations used for testing and verification utilize mathematical models to construct logical models to simulate equipment functions. These logic models are object-based process simulations, linking each link with a transfer function. They fail to simulate overall influencing factors and suffer from poor readability and modifiability. Existing mechanism-based simulation test models also simplify simulation functionality and are unable to effectively simulate the transient behavior of nuclear power turbine units. Complex mechanism-based turbine models also struggle to meet the high-speed response requirements of testing and verification. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a steam turbine mechanism simulation platform.
[0004] The technical solution adopted by the present invention to solve the technical problem is: a steam turbine mechanism simulation platform for verifying the nuclear power steam turbine control system, the steam turbine mechanism simulation platform includes: an interface switching subsystem, a virtual simulation subsystem, a modeling subsystem, and a control subsystem;
[0005] The control subsystem is constructed according to the steam turbine system of the nuclear power unit, and uses the interface switching subsystem to access the test steam turbine control program or the preset steam turbine control program, and performs corresponding operations based on the output signal sent by the virtual simulation subsystem;
[0006] The modeling subsystem is used to construct a virtual model of the steam turbine unit of the steam turbine system based on the mechanism principle of the steam turbine system, and inject the virtual model of the steam turbine unit into the virtual simulation subsystem;
[0007] The virtual simulation subsystem is used to drive the steam turbine virtual model provided by the modeling subsystem, and send the output signal of the steam turbine virtual model to the control subsystem to perform corresponding operations;
[0008] The interface switching subsystem is used to access the test turbine control program or the preset turbine control program.
[0009] Preferably, the modeling subsystem includes at least one preset process model;
[0010] Each process system of the steam turbine system corresponds to one of the preset process models;
[0011] The modeling subsystem constructs the virtual model of the steam turbine unit, including:
[0012] The preset process model is selected and / or constructed according to all processes of the steam turbine system, and the preset process model is assembled according to the actual functional mechanism of the steam turbine system and the process system.
[0013] Preferably, the preset process model includes at least one nuclear power process equipment;
[0014] The preset model is a process system composed of at least one of the nuclear power process equipment;
[0015] The operation period of the steam turbine group virtual model is less than or equal to the equipment response period of the steam turbine system.
[0016] Preferably, the preset process model includes turbine steam and drain systems;
[0017] According to the actual application scenario of the nuclear power steam turbine unit, the boundary parameters of the steam turbine steam and drain system are limited.
[0018] Preferably, the preset process model further includes: an auxiliary steam-water primary circuit subsystem;
[0019] The main steam boundary in the steam turbine and drain system is the steam boundary of the auxiliary steam-water primary circuit subsystem; the steam boundary parameters of the auxiliary steam-water primary circuit subsystem are set according to the main steam demand under the actual operating conditions of the steam turbine system.
[0020] Preferably, the preset process model further includes a high-pressure feedwater heater system;
[0021] The feedwater boundary of the high-pressure feedwater heater system is defined according to the feedwater pressure and feedwater temperature in the steam turbine system.
[0022] Preferably, the preset process model is constructed by using equipment built based on a mathematical model through the mechanism of fluid and heat transfer.
[0023] Preferably, the control subsystem is further used to control the operation cycle of the steam turbine virtual model.
[0024] Preferably, the control subsystem also includes a steam turbine experimental operation program, a test operation program, a startup operation program, a grid connection operation program, and a power increase and decrease operation program.
[0025] Preferably, it also includes a human-computer interaction system;
[0026] The human-computer interaction system sends the instructions issued by the user to the control subsystem and displays the operating status of the virtual model of the steam turbine group.
[0027] The implementation of the present invention has the following beneficial effects:
[0028] The present invention utilizes a modeling subsystem to construct a virtual model of a steam turbine unit based on the principles of the steam turbine system, which is then injected into the virtual simulation subsystem. The interface switching subsystem allows the test turbine control program to be individually introduced into the control subsystem. The control subsystem tests the virtual model of the steam turbine unit, and thus the test turbine control program. The virtual model of the steam turbine unit simulates each nuclear power steam turbine unit individually, thereby improving the simulation fidelity of nuclear power turbine testing and verification, and expanding the model simulation scope for testing and verification of steam turbine control systems. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0030] Figure 1 This is a structural diagram of a steam turbine mechanism simulation platform in one embodiment;
[0031] Figure 2 Schematic diagram of modeling of a steam turbine mechanism simulation platform in one embodiment. DETAILED DESCRIPTION
[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.
[0033] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0034] The embodiment of the present invention provides a steam turbine mechanism simulation platform for verifying nuclear power steam turbine control systems. Figure 1 As shown in FIG, the steam turbine mechanism simulation platform includes: an interface switching subsystem, a virtual simulation subsystem, a modeling subsystem, and a control subsystem.
[0035] The control subsystem is built according to the steam turbine system of the nuclear power unit, and uses the interface switching subsystem to access the test steam turbine control program or the preset steam turbine control program, and performs corresponding operations based on the output signal sent by the virtual simulation subsystem.
[0036] Specifically, the turbine control program of a steam turbine system is a comprehensive system designed to ensure safe and efficient operation of the turbine under various operating conditions. It controls parameters such as steam flow, speed, and load to implement turbine startup, operation, shutdown, and fault protection. The control subsystem issues control instructions to the virtual simulation subsystem by accessing a test turbine control program or a preset turbine control program.
[0037] In some scenarios, the control subsystem has a built-in preset steam turbine control program. Preset steam turbine control programs are usually used to meet teaching needs.
[0038] Specifically, the test turbine control program is the steam turbine control program to be tested. The steam turbine group virtual model is used to test the corresponding test turbine control program.
[0039] The modeling subsystem is used to construct a virtual model of the steam turbine unit of the steam turbine system based on the mechanism principle of the steam turbine system, and inject the virtual model of the steam turbine unit into the virtual simulation subsystem.
[0040] It should be noted that the modeling subsystem is responsible for constructing and managing the mathematical models used to simulate the behavior of the steam turbine and its control system. The virtual model of the steam turbine unit constructed by the modeling subsystem is a mechanism simulation. This simulation is based on the functional mechanism of the nuclear power steam turbine, and the interaction between various devices can truly reflect the impact of various influencing factors on the unit under actual unit conditions.
[0041] Optionally, a virtual model of the steam turbine unit can be built based on the process systems involved in testing the steam turbine control program, ensuring a complete test of all functions of the steam turbine control program.
[0042] The virtual simulation subsystem is used to drive the virtual model of the steam turbine unit provided by the modeling subsystem, and send the output signal of the virtual model of the steam turbine unit to the control subsystem to perform corresponding operations.
[0043] The virtual simulation subsystem reads the parameters and configuration information of the steam turbine unit virtual model provided by the modeling subsystem, and initializes and configures it, including the fluid and equipment characteristics of the steam turbine system.
[0044] During the simulation process, the virtual simulation subsystem drives the virtual turbine model to perform corresponding actions based on preset operating conditions or user-entered control parameters. For example, during turbine startup, the virtual simulation subsystem simulates the process of steam entering the turbine and the gradual increase in speed.
[0045] The interface switching subsystem is used to access the test turbine control program or the preset turbine control program.
[0046] It should be noted that the preset steam turbine control program can be used to test the connection relationship between the virtual model of the steam turbine unit and whether the design meets the requirements. Through the interface switching subsystem, the virtual model of the steam turbine unit and the test steam turbine control program can be tested separately, thereby ensuring the accuracy of the test turbine control program.
[0047] The present invention utilizes a modeling subsystem to simulate nuclear power steam turbine units one by one based on mechanism principles, generating a virtual turbine model. This virtual turbine model is integrated into the test turbine control program, thereby improving the simulation authenticity of nuclear power turbine testing and verification, and expanding the model simulation scope for testing and verification of steam turbine control systems.
[0048] Furthermore, the function of the steam turbine virtual model can simulate the whole process control of the steam turbine system from startup, warm-up, rush to rated speed, grid connection to full load, as well as the system response phenomena under closed-loop response control of various transient operating conditions.
[0049] In some scenarios, because the control program for the test turbine is a production-ready one, the simulation platform's operating cycle is set based on the test requirements. This shortens the operating cycle and improves the response cycle of the turbine mechanism simulation model.
[0050] Furthermore, in order to control the operation cycle of the virtual turbine model, the simulation in the modeling subsystem can degrade the multi-directional flow into a unidirectional fluid flow simulation or structural mechanics simulation. The simulation calculation amount of the unidirectional fluid is greatly reduced, and the simulation results can be obtained more quickly.
[0051] In one executable embodiment, the modeling subsystem includes at least one preset process model.
[0052] Each process system of the steam turbine system corresponds to a preset process model.
[0053] Specifically, the steam turbine system includes: steam turbine steam and drain system, steam-water separation and reheat system, condensate extraction system, low-pressure feedwater heater system, drain heat recovery system, feedwater deaerator system, electric feedwater pump system, high-pressure feedwater heater system, turbine regulating oil system, electrical system, and turbine partial control logic.
[0054] The modeling subsystem builds a virtual model of the steam turbine unit, including:
[0055] Select and / or build a preset process model based on all processes of the steam turbine system, and assemble the preset process model based on the actual functional mechanism of the steam turbine system and the process system.
[0056] Modeling is done by distinguishing process systems, connecting individual devices into a single process system, and then integrating these systems into a complete turbine simulation. This complete high-speed model realistically depicts normal and abnormal thermodynamic transient processes caused by operation, non-operation, or simulated device failure.
[0057] In an executable embodiment, the preset process model includes at least one nuclear power process equipment.
[0058] The preset model is a process system consisting of at least one nuclear power process equipment.
[0059] Modeling is done according to the process flow in each actual process system. The preset process model covers various nuclear power process equipment such as pumps, valves, pipelines, turbines, heat exchangers, single-phase water tanks, two-phase water tanks, and instruments.
[0060] The operation cycle of the virtual model of the steam turbine unit is less than or equal to the equipment response cycle in the steam turbine system.
[0061] Specifically, by controlling the granularity of the virtual model of the steam turbine unit, not only can the real-time operation of the virtual model of the steam turbine unit be improved, but also the communication rate between the mechanism simulation model processes can be improved. By speeding up the data interaction of the communication interface program and reducing the time consumption of data reception, data calculation, data return and other links, the communication rate is further improved.
[0062] In one executable embodiment, the preset process model includes turbine steam and drain systems.
[0063] According to the actual application scenarios of nuclear power steam turbine units, the boundary parameters of the steam turbine and drain systems are limited.
[0064] The boundary parameters of the steam turbine steam and drain system include the main steam boundary and the main feedwater receiving boundary. By manipulating these two boundaries, the secondary steam-water system involved in the operation of the steam turbine is looped, enabling the transient simulation operation of the unit.
[0065] In an executable embodiment, the preset process model further includes: an auxiliary steam-water primary circuit subsystem.
[0066] The main steam boundary in the turbine steam and drain system serves as the steam boundary for the auxiliary steam-water primary circuit subsystem. The steam boundary parameters for the auxiliary steam-water primary circuit subsystem are set based on the main steam demand under the actual operating conditions of the turbine system.
[0067] The source of main steam in the actual unit is the secondary circuit main steam generated by heating in the core heating steam generator. In this model, the boundary of the auxiliary steam-water primary circuit subsystem is processed, and the boundary parameters are set according to the main steam demand under various operating conditions to ensure that the main steam flow rate and temperature under various operating conditions of the steam turbine simulation are consistent with those of the actual unit.
[0068] The main steam boundary model needs to use parameters such as electric power and core power to call the corresponding curve function to dynamically set the pressure and temperature of the main steam, such as Figure 2 By modeling as shown, the steam turbine mechanism simulation platform can simulate various working conditions, calculate the steam parameters at the high-pressure cylinder inlet, and realize the operation of the steam circuit.
[0069] In one exemplary embodiment, the preset process model further includes a high-pressure feedwater heater system.
[0070] The feedwater boundaries of the high-pressure feedwater heater system are defined based on the feedwater pressure and feedwater temperature in the turbine system.
[0071] Furthermore, the outlet of the high-pressure feedwater heater system is fixed with reference to the actual feedwater pressure and temperature of the main feedwater to the steam generator in the steam turbine unit to ensure the normal main feedwater flow of the steam turbine system.
[0072] The main feedwater boundary modeling method is similar to the main steam boundary modeling method. Combining parameters such as electric power, main steam pressure, and steam-water pressure difference, the corresponding pressure curve function and temperature curve function are called on the steam turbine mechanism simulation platform to dynamically simulate the main feedwater characteristics. In this way, the water circuit simulation model established by the steam turbine mechanism simulation platform can operate normally, and the water circuit and steam circuit ultimately constitute an overall water-steam cycle.
[0073] In an executable embodiment, the preset process model is constructed by using equipment built based on a mathematical model through the mechanism of fluid and heat transfer.
[0074] The mathematical model in the mechanism modeling of the present invention is based on the principles of conservation of mass, energy and momentum, and applies the continuity equation, momentum equation and energy equation of fluid mechanics, the heat conduction, heat convection and heat radiation equations of heat transfer, and the partial differential equations describing the entire fluid and heat transfer to establish the preset process models of each device and the virtual model of the turbine unit.
[0075] In an executable embodiment, the control subsystem is further used to control the operation cycle of the steam turbine virtual model.
[0076] Specifically, the operation cycle of controlling the virtual model of the steam turbine group can be set to 10 milliseconds.
[0077] In an executable embodiment, the control subsystem also includes a steam turbine experimental operation program, a test operation program, a startup operation program, a grid connection operation program, and a power increase and decrease operation program.
[0078] Specifically, the operating program in the control subsystem corresponds to the test turbine control program and the subprogram in the preset turbine control program, so that the control subsystem can be better connected to the test turbine control program.
[0079] In one executable embodiment, a human-computer interaction system is also included.
[0080] The human-computer interaction system sends the user's instructions to the control subsystem and displays the operating status of the virtual model of the steam turbine group.
[0081] The human-computer interaction system includes an operation interface. The operation interface sets up a second-level screen for TCS-CVP test operation, developed with 3Kemymater software, and includes four parts: the overall status of the steam turbine and platform loading, the steam turbine IO interface, the steam turbine operating system diagram interface, and the IO virtual-real interface switching screen (deployed on demand).
[0082] Steam turbine overall status and operation interface: displays the overall operating status of the TCS verification platform, steam turbine status, virtual-real connection status, platform loading and operation status, IC status, etc. It is the beginning and start page of the TCS verification screen.
[0083] Steam turbine I / O interface: As an extension of the I / O system page, it implements data display, operation connection and channel testing functions. It can view, detect and verify the I / O interface channel status. Its diagram is customized and developed based on the I / O system software management interface, and important parameters are displayed in real time.
[0084] Specifically, after the interface switching subsystem switches to the test Qilu Nanchang control program, the control subsystem needs to perform a channel test function to verify whether the steam turbine mechanism simulation platform is connected to the cabinet to ensure the accuracy of the test steam turbine control program verification.
[0085] Steam turbine operating system interface: provides interactive operations such as steam turbine experiment, testing, startup, grid connection, and power increase and decrease. The operation refers to the OPS-related steam turbine system screen deployment, adds a fault button, and the operation box style is designed with direct and quick access as the starting point.
[0086] Communication interface switching screen: used for human-computer interaction to switch signals between the preset turbine control program and the test turbine control program. When the cabinet control signal (test turbine control program) is not connected, the simulated control signal (preset turbine control program) is used as a supplement. During the test, the control is switched to select the signal.
[0087] In some executable embodiments, the interface switching subsystem includes an interface signal point that simulates settings.
[0088] When the interface switching subsystem intervenes in the turbine control program test, it primarily accesses 272 signal points, including those for power regulation, speed regulation, and protection functions of the GRE and GSE. These include 55 AI points, 86 DI points, 56 AO points, 66 DO points, and 9 PI points. Signal switching is performed via the logic selection module, with sources including control logic signals and external hard-wired signal sources.
[0089] The above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.
Claims
1. A steam turbine mechanism simulation platform for verifying nuclear power steam turbine control systems, characterized in that: The steam turbine mechanism simulation platform includes: an interface switching subsystem, a virtual simulation subsystem, a modeling subsystem, and a control subsystem; The control subsystem is constructed according to the steam turbine system of the nuclear power unit, and uses the interface switching subsystem to access the test steam turbine control program or the preset steam turbine control program, and performs corresponding operations based on the output signal sent by the virtual simulation subsystem; The modeling subsystem is used to construct a virtual model of the steam turbine unit of the steam turbine system based on the mechanism principle of the steam turbine system, and inject the virtual model of the steam turbine unit into the virtual simulation subsystem; The virtual simulation subsystem is used to drive the steam turbine virtual model provided by the modeling subsystem, and send the output signal of the steam turbine virtual model to the control subsystem to perform corresponding operations; The interface switching subsystem is used to access the test turbine control program or the preset turbine control program.
2. The simulation platform according to claim 1, characterized in that: The modeling subsystem includes at least one preset process model; Each process system of the steam turbine system corresponds to one of the preset process models; The modeling subsystem constructs the virtual model of the steam turbine unit, including: The preset process model is selected and / or constructed according to all processes of the steam turbine system, and the preset process model is assembled according to the actual functional mechanism of the steam turbine system and the process system.
3. The simulation platform according to claim 2, characterized in that: The preset process model includes at least one nuclear power process equipment; The preset model is a process system composed of at least one of the nuclear power process equipment; The operation period of the steam turbine group virtual model is less than or equal to the equipment response period of the steam turbine system.
4. The simulation platform according to claim 2, characterized in that: The preset process model includes turbine steam and drain systems; According to the actual application scenario of the nuclear power steam turbine unit, the boundary parameters of the steam turbine steam and drain system are limited.
5. The simulation platform according to claim 4, characterized in that: The preset process model further includes: an auxiliary steam-water primary circuit subsystem; The main steam boundary in the steam turbine and drain system is the steam boundary of the auxiliary steam-water primary circuit subsystem; the steam boundary parameters of the auxiliary steam-water primary circuit subsystem are set according to the main steam demand under the actual operating conditions of the steam turbine system.
6. The simulation platform according to claim 5, characterized in that: The preset process model also includes a high-pressure feedwater heater system; The feedwater boundary of the high-pressure feedwater heater system is defined according to the feedwater pressure and feedwater temperature in the steam turbine system.
7. The simulation platform according to claim 2, characterized in that: The preset process model is constructed by using equipment built based on mathematical models through the mechanism of fluid and heat transfer.
8. The simulation platform according to claim 1, characterized in that: The control subsystem is also used to control the operation cycle of the steam turbine virtual model.
9. The simulation platform according to claim 8, characterized in that: The control subsystem also includes a steam turbine experiment operation program, a test operation program, a start-up operation program, a grid connection operation program, and a power increase and decrease operation program.
10. The simulation platform according to claim 1, characterized in that: It also includes human-computer interaction system; The human-computer interaction system sends the instructions issued by the user to the control subsystem and displays the operating status of the virtual model of the steam turbine group.