A steam turbine simulation device and method based on PLC technology
Through the turbine simulation device based on PLC technology, the signal delay and distortion problems in the existing technology are solved, high-speed and stable transmission and real-time data processing are realized, the reliability and maintenance of the simulation device are improved, and a stable and reliable test environment is provided for the verification of the turbine control system.
Patent Information
- Application Number
- CN202411969022.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-08
AI Technical Summary
The existing turbine simulation devices are based on industrial control machine platforms, which are difficult to meet the strict requirements of turbine simulation for real-time performance, resulting in delays and distortions in signal output.
The turbine simulation device based on PLC technology is adopted, and through the combination of the main module, the input module, the output module and the frequency output module, high-speed and stable transmission and real-time data processing are realized to ensure the accurate output of simulation parameters and speed signals.
It avoids delays and distortions in signal acquisition and output, improves the reliability and maintenance of the device, and provides a stable and reliable testing environment for the verification of the turbine control system.
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Figure CN119781313A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of steam turbine control system testing, and in particular to a steam turbine simulation device and method based on PLC technology. Background Art
[0002] With the rapid development of nuclear power, thermal power and other fields, the reliability verification of steam turbine control systems has become increasingly important. Before the unit is officially put into operation, the control system must be fully functionally verified to ensure that it can work normally under various operating conditions. However, due to the high value of actual steam turbine equipment and the huge test risks, it is neither economical nor safe to directly use real equipment to verify the control system.
[0003] At present, the industry usually uses dedicated simulation verification devices to solve this problem. Such devices are usually developed based on industrial computer platforms and generate various simulation signals through software simulation. However, since industrial computers use general operating systems as operating platforms, their signal processing mechanisms are difficult to meet the strict real-time requirements of steam turbine simulation, resulting in significant delays and distortions in various signal outputs, including speed. Summary of the invention
[0004] The present application provides a steam turbine simulation device and method based on PLC technology, which are used to avoid delay and distortion in the process of signal acquisition and output.
[0005] In the first aspect, the present application provides a steam turbine simulation device based on PLC technology, the device comprising: a main module, an input module, an output module and a frequency output module; wherein the input module is used to receive a control signal sent by a steam turbine control system, and send the control signal to the main module through a backplane bus; the main module is used to execute a simulation configuration program that simulates the operating characteristics of the steam turbine according to the control signal, calculate the simulation operating parameters and speed values under corresponding operating conditions, and send the simulation operating parameters to the output module through the backplane bus, and send the speed value to the frequency output module through the backplane bus; the output module is used to send the simulation operating parameters to the steam turbine control system; the frequency output module is used to convert the received speed value into a pulse signal of corresponding frequency, and send the pulse signal to the steam turbine control system.
[0006] By adopting the above technical solution, the simulation device of the present application realizes high-speed and stable transmission of control signals through the cooperation of the input module and the backplane bus. The real-time operation of the main module based on the simulation configuration program ensures the uniformity of data processing, while the parallel signal processing mechanism of the output module and the frequency output module ensures the accurate output of simulation parameters and speed signals. This modular signal processing link not only avoids delays and distortions in the signal acquisition and output process, but also improves the reliability and maintainability of the device, thereby providing a stable and reliable test environment for the verification of the steam turbine control system.
[0007] Optionally, the input module includes: an analog input module and a digital input module; wherein the analog input module is used to receive an analog control signal sent by a steam turbine control system; and the digital input module is used to receive a switch control signal sent by a steam turbine control system.
[0008] By adopting the above technical solution, and by subdividing the input module into an analog input module and a digital input module, the present application can classify and process different types of control signals sent by the steam turbine control system. The analog input module specifically receives continuously changing analog control signals such as the opening of the regulating valve, while the digital input module specifically receives switching control signals such as speed increase and speed decrease. This targeted signal acquisition mechanism not only avoids mutual interference between different types of signals, but also selects the most suitable sampling frequency and resolution accuracy according to the signal characteristics, thereby improving the acquisition quality of the control signal.
[0009] Optionally, the analog input module is used to receive an analog control signal of -50~50mA; and the digital input module adopts a dry contact input method.
[0010] By adopting the above technical solution, by setting the signal receiving range of the analog input module to -50~50mA, the complete collection of analog control signals such as the opening of the regulating valve is ensured; and the dry contact input method transmits switching signals such as speed increase and speed decrease through the on-off state of the passive contact, which has the characteristics of strong anti-interference ability and high reliability, thereby ensuring the accuracy and stability of control signal acquisition.
[0011] Optionally, the output module includes: an analog output module and a digital output module; wherein the analog output module is used to send analog simulation parameters to the turbine control system; and the digital output module is used to send switch simulation parameters to the turbine control system.
[0012] By adopting the above technical solution, the application realizes the classified output processing of simulation parameters by dividing the output module into analog output module and digital output module. The analog output module is specifically responsible for outputting continuously changing analog simulation parameters such as main steam pressure, while the digital output module is specifically responsible for outputting switch simulation parameters such as limit status. This classified output mechanism not only enables various types of simulation parameters to select appropriate output methods according to their inherent characteristics, but also independently configures output accuracy and refresh cycle for different types of signals, thereby improving the accuracy and real-time performance of simulation parameter output.
[0013] Optionally, the analog output module is used to output 4~20mA analog simulation parameters; the digital output module adopts relay output mode.
[0014] By adopting the above technical solution, by setting the signal range of the analog output module to 4~20mA, the turbine control system can accurately collect analog simulation parameters such as the main steam pressure; and the relay output method transmits switch simulation parameters such as the limit state through the opening and closing state of the mechanical contacts, which has the characteristics of good electrical isolation and strong load capacity, thereby ensuring the reliability and adaptability of the simulation parameter output.
[0015] Optionally, the input module, the output module and the frequency output module are connected to the steam turbine control system by hard wiring; the frequency output module is used to output a pulse signal of 1 Hz to 10 kHz.
[0016] By adopting the above technical solution, the connection between the simulation device and the steam turbine control system is established by hard wiring, and the output range of the frequency output module is set to 1Hz~10kHz, and the present application realizes reliable signal transmission. Among them, the hard wiring method avoids the communication protocol conversion link, ensuring that the signal transmission between the input module, the output module and the frequency output module and the control system is direct and fast; and the pulse signal output range of 1Hz~10kHz completely covers the full operating speed characteristics of the steam turbine from startup, speed increase to rated operation, ensuring the continuity and accuracy of the speed simulation, thereby improving the real-time and reliability of the entire simulation system.
[0017] Optionally, the main module is communicatively connected to a host computer, and the main module is further used to receive a simulation configuration program downloaded by the host computer and respond to online debugging instructions of the host computer.
[0018] By adopting the above technical solution and establishing a communication connection between the main module and the host computer, the present application realizes flexible configuration and debugging of the simulation device. The main module can receive the simulation configuration program downloaded by the host computer, which is convenient for quickly updating the simulation model according to the characteristics of different types of steam turbines. At the same time, by responding to the online debugging instructions of the host computer, the simulation parameters can be monitored and adjusted in real time, thereby improving the adaptability and maintainability of the simulation device, so that it can meet the simulation verification requirements in different application scenarios.
[0019] In a second aspect, the present application provides a steam turbine simulation method based on PLC technology, the method comprising: receiving a control signal sent by a steam turbine control system; executing a simulation configuration program that simulates the operating characteristics of the steam turbine according to the control signal, and calculating simulation operating parameters and speed values under corresponding operating conditions; sending the simulation operating parameters to the steam turbine control system; converting the received speed value into a pulse signal of corresponding frequency, and sending the pulse signal to the steam turbine control system.
[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. The simulation device of the present application realizes high-speed and stable transmission of control signals through the cooperation of input modules and backplane buses. The real-time operation of the main module based on the simulation configuration program ensures the uniformity of data processing, while the parallel signal processing mechanism of the output module and the frequency output module ensures the accurate output of simulation parameters and speed signals. This modular signal processing link not only avoids delays and distortions in the process of signal acquisition and output, but also improves the reliability and maintainability of the device, thereby providing a stable and reliable test environment for the verification of steam turbine control systems. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of a steam turbine simulation device based on PLC technology provided in an embodiment of the present application; Figure 2 It is a flow chart of a steam turbine simulation method based on PLC technology provided in an embodiment of the present application. DETAILED DESCRIPTION
[0022] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.
[0023] In the description of the embodiments of the present application, words such as "illustrative", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "illustrative", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "illustrative", "for example" or "for example" is intended to present related concepts in a concrete way.
[0024] During the commissioning and verification of a steam turbine control system in a nuclear power plant, the simulation device of the present application is used in conjunction with the steam turbine control system. The simulation device configuration includes: 1 main module, 1 analog input module (8 channels), 5 analog output modules (40 channels in total), 2 digital input modules (32 channels in total), 1 digital output module (16 channels) and 1 frequency output module (4 channels).
[0025] First, the pre-programmed simulation configuration program of the normal startup process of the steam turbine is downloaded to the main module through the host computer. The simulation configuration program contains a complete process model of the steam turbine gradually increasing speed from a stationary state to the rated speed.
[0026] During the simulation process: when the turbine control system issues a start-up command, the command is collected by the digital input module through hard wiring and transmitted to the main module via the backplane bus; the main module executes the simulation configuration program to calculate various parameters of the turbine during the startup process, including: analog parameters such as steam pressure and temperature, switch parameters such as various valve states, and rotor speed values.
[0027] The main module transmits the calculated analog parameters to the analog output module through the backplane bus, and outputs them to the turbine control system in the form of current signals; the switch parameters are transmitted to the control system in the form of relay contacts through the digital output module; the speed value is transmitted from the main module to the frequency output module, converted into a pulse signal of the corresponding frequency and output to the control system.
[0028] During operation, operators can monitor the simulation operation status in real time through the host computer, and can modify the simulation parameters online to simulate special working conditions when necessary. For example: simulate the turbine overspeed protection condition: increase the speed quickly through the host computer command; simulate the abnormal steam parameter condition: modify the corresponding analog output value; simulate the emergency trip condition: trigger the corresponding digital state change.
[0029] In this way, the control logic correctness of the steam turbine control system under various normal and abnormal operating conditions can be fully verified to ensure the safety and reliability of subsequent actual operation.
[0030] Figure 1It is a structural schematic diagram of a steam turbine simulation device based on PLC technology provided in an embodiment of the present application.
[0031] like Figure 1 As shown, the device includes: a host computer, a main module, an analog input module, an analog output module, a digital input module, a frequency analog output module and a digital output module; wherein, The analog input module is used to receive the analog control signal sent by the turbine control system.
[0032] The digital input module is used to receive the switch control signal sent by the turbine control system.
[0033] The main module is used to execute the simulation configuration program that simulates the operating characteristics of the steam turbine according to the control signal sent by the analog input module and / or the digital input module, calculate the simulation operating parameters and speed values under the corresponding working conditions, and send the simulation operating parameters to the analog output module and / or the digital output module through the backplane bus, and send the speed value to the frequency output module through the backplane bus.
[0034] Analog output module, used to send analog simulation parameters to the turbine control system.
[0035] Digital output module, used to send switch quantity simulation parameters to the turbine control system.
[0036] The frequency output module is used to convert the received speed value into a pulse signal of the corresponding frequency and send the pulse signal to the turbine control system.
[0037] Specifically, during the debugging process of the power plant steam turbine control system, it is usually necessary to fully verify the control logic. The steam turbine simulation device based on PLC technology provided in this embodiment realizes a comprehensive simulation of the steam turbine operating characteristics through modular design.
[0038] In the present invention, the host computer is mainly used for writing, downloading and updating the simulation configuration program. It realizes real-time monitoring and debugging of simulation parameters through communication connection with the main module. It is also responsible for remote configuration and fault diagnosis of the simulation device, so that the simulation device has good adaptability and maintainability, and can quickly update the simulation model according to the characteristics of different turbine models to meet the verification requirements of different application scenarios.
[0039] The input module includes analog input module and digital input module. The analog input module uses a current signal range of -50~50mA to collect analog control signals such as control valve opening instructions and speed control signals issued by the control system; the digital input module uses a passive dry contact input method to collect switch control signals such as speed increase instructions, speed reduction instructions, and emergency shutdown. The design of this input interface is completely matched with the output interface of the actual steam turbine control system. After collecting these control signals, the input module transmits them to the main module through the backplane bus. The backplane bus uses a high-speed serial communication method to ensure the real-time nature of signal transmission.
[0040] The main module is the core of the entire simulation device, which integrates a high-performance industrial-grade CPU and a large-capacity memory. After receiving the control signal, the main module immediately executes the pre-loaded simulation configuration program. The program contains a complete steam turbine thermodynamic model and dynamic model, which can accurately simulate the operating characteristics of the steam turbine under different operating conditions. For example, during the startup process, the program will calculate the acceleration process of the rotor in real time based on parameters such as the steam turbine's moment of inertia, steam thrust characteristics, and valve characteristic curves. The calculation results include simulation operating parameters such as main steam pressure, exhaust pressure, bearing vibration, rotor eccentricity, and speed values reflecting the rotor speed. These calculation results are transmitted to the output module and frequency output module respectively through the backplane bus.
[0041] The output module is also divided into analog output module and digital output module. The analog output module uses 4~20mA standard current signal output to feedback various analog operation parameters to the control system. The accuracy of the output current is better than 0.1%, ensuring the accurate transmission of simulation parameters. The digital output module uses relay output with a contact capacity of AC250V / 3A, which is used to feedback state quantity signals such as bearing vibration alarm and vacuum abnormality. This output method has strong anti-interference ability and ensures the reliability of signal transmission.
[0042] The frequency output module uses high-precision frequency synthesis technology and can output square wave pulse signals in the range of 1Hz to 10kHz. After receiving the speed value sent by the main module, the module converts it into a pulse signal of the corresponding frequency through the internal digital-to-analog conversion circuit. For example, when the speed value is 3000rpm, a 300Hz square wave signal is output. This conversion relationship is completely consistent with the working principle of the actual turbine speed sensor, allowing the control system to accurately obtain speed information.
[0043] Through the collaborative work of the above modules, the simulation device of this embodiment realizes a high degree of simulation of the operating characteristics of the steam turbine. Especially in important occasions such as nuclear power units, this device can simulate various operating conditions including normal start and stop, load regulation, overspeed protection, etc., providing a reliable platform for comprehensive verification of the control system.
[0044] For example, when debugging the overspeed protection function, the speed value can be quickly increased to 110% of the rated speed through the simulation device to verify whether the protection action of the control system is correct. This simulation verification method not only ensures the safety of debugging, but also improves the debugging efficiency, laying the foundation for the safe operation of the unit.
[0045] In order to realize flexible configuration and real-time monitoring of the simulation device, the main module of this embodiment establishes a communication connection with the host computer via industrial Ethernet. This connection mode not only supports the download of the simulation configuration program, but also can realize the online debugging function, making the simulation process more controllable and efficient.
[0046] In actual application, the operator first needs to compile the corresponding simulation configuration program on the host computer according to the actual characteristics of the steam turbine to be verified. The program contains a complete mathematical model of the steam turbine, covering core elements such as thermal characteristics, mechanical characteristics and control characteristics. After the program is compiled, it is downloaded to the main module via industrial Ethernet. After receiving the program, the main module stores it in the internal program memory and initializes the parameters. This program download mechanism enables the simulation device to adapt to the characteristic requirements of different types of steam turbines and has good versatility.
[0047] During the simulation process, the operator can monitor the simulation running status in real time through the host computer and send online debugging instructions as needed. For example, when it is necessary to verify the fault response characteristics of the control system, the host computer can send parameter modification instructions to the main module to force the values of certain simulation parameters to change. After receiving these online debugging instructions, the main module will perform the corresponding parameter modification operations in the next scan cycle, so that the simulation process presents new operating characteristics. This real-time intervention mechanism enables the simulation device to flexibly simulate various normal working conditions and accident working conditions, creating conditions for comprehensive verification of the control system.
[0048] The simulation device of this embodiment adopts the working mechanism driven by the main module during actual operation. First, the simulation configuration program compiled according to the actual characteristics of the steam turbine is downloaded to the main module through the host computer. The program contains a complete mathematical model of the steam turbine, in which the operating parameters can be preset and adjusted according to the specific needs of the user to adapt to the characteristic requirements of different types of steam turbines.
[0049] The main module uses a cyclic scanning mode to execute the simulation configuration program. In each scanning cycle, the CPU of the main module strictly works according to the three stages of input refresh, program execution and output refresh.
[0050] Specifically, the CPU starts from the first instruction of the program and performs periodic scanning according to the instruction step number. In the absence of jump instructions, the CPU will execute the user program one by one until it encounters the program end character and returns to the first instruction, forming a closed loop. This cyclic execution mechanism ensures the continuity and stability of the simulation process.
[0051] In the I / O refresh phase, since input refresh is performed immediately after output refresh, these two processes are integrated into a unified I / O refresh phase. In this phase, the AI module and the DI module collect various control instructions from the turbine control system in real time. For example, when the control system issues a speed control instruction, the AI module collects the control valve opening signal, and the DI module collects the speed increase instruction contact status. These signals are transmitted to the main module through the backplane bus and participate in subsequent simulation operations.
[0052] During the program execution phase, the main module executes the simulation configuration program to calculate the new operating status according to the collected control instructions. At the same time, the CPU of the main module also performs self-diagnosis functions including communication protocol checking and data integrity verification, and maintains data interaction with the host computer through industrial Ethernet. These monitoring service operations are usually performed after the program execution is completed, which is an important part of ensuring the reliable operation of the system. The duration of the entire scan cycle mainly depends on the scale of the simulation program, and is generally controlled at the millisecond level to ensure real-time performance.
[0053] In the output link, the output module and the frequency output module transmit the calculated simulation parameters to the steam turbine control system in real time. Among them, the output module is responsible for outputting the simulation operation parameters in analog and digital form, including but not limited to main steam parameters, bearing status, vacuum degree and other operation parameters; the frequency output module is specifically responsible for converting the speed value into a pulse signal output of the corresponding frequency. This all-round parameter simulation enables the control system to obtain feedback information that is completely consistent with the actual operating status.
[0054] This embodiment describes in detail the working process of the steam turbine simulation device based on PLC technology from the perspective of system operation flow and data processing. The device has three main working stages in actual application: system initialization stage, cycle operation stage and online debugging stage.
[0055] In the system initialization stage, the simulation configuration program is first downloaded to the main module through the host computer. The configuration program contains a complete mathematical model of the steam turbine, covering three levels: thermal process, mechanical characteristics and control characteristics. The thermal process model describes the complete expansion process of steam from the main steam valve to the exhaust; the mechanical characteristics model includes the inertia characteristics and bearing characteristics of the rotor system; and the control characteristics model reflects the dynamic response characteristics of actuators such as the regulating valve and interception valve. After receiving the program, the main module performs parameter initialization and sets all simulation operation parameters to the initial values corresponding to the cold start.
[0056] During the cyclic operation phase, the entire device works according to a fixed scan cycle. Each scan cycle includes three steps: input sampling, program operation, and output refresh. In the input sampling step, the input module collects all signals from the control system. For example, when the control system issues a speed increase command, the digital input module detects the command through dry contacts, and the analog input module collects the control valve opening command. These signals are processed by anti-interference filtering and transmitted to the main module through the backplane bus.
[0057] In the program operation steps, the main module first normalizes the input signal and converts the current signal of -50~50mA into the corresponding engineering quantity. Then, based on these input quantities, the simulation configuration program is executed to calculate the new operating state. The calculation process uses the fourth-order Runge-Kutta algorithm, which can accurately reflect the dynamic characteristics of the steam turbine system. For example, during the speed increase process, the program will consider the combined effects of steam thrust, mechanical friction and rotor inertia, and calculate the acceleration curve that conforms to the actual law. The calculated simulation operation parameters and speed values are respectively denormalized and converted into standard output signals.
[0058] In the output refresh step, the converted output signal is transmitted to the output module and frequency output module through the backplane bus. The digital-to-analog conversion circuit in the output module converts the digital quantity into a standard current signal of 4~20mA; the frequency output module converts the speed value into a square wave signal of the corresponding frequency through the frequency synthesis circuit. These signals are transmitted to the control system through hard wiring to complete a complete scanning cycle.
[0059] The implementation process of the present invention is described in detail below with reference to specific examples. Take the verification of a 1000MW steam turbine control system of a nuclear power plant as an example: In practical applications, it is first necessary to compile a simulation configuration program on the host computer according to the characteristic parameters of the steam turbine model. The program contains a complete mathematical model that reflects the characteristics of the steam turbine, including: the main steam valve regulating characteristic curve, the high-pressure cylinder efficiency curve, the medium-pressure cylinder efficiency curve, the low-pressure cylinder efficiency curve, the relationship curve between bearing vibration and speed, and other core parameters. These characteristic parameters are derived from the design data and operating experience of the actual unit, ensuring the consistency between the simulation model and the actual equipment. After the program is compiled, it is downloaded to the main module via industrial Ethernet.
[0060] The working process of the simulation device is explained by taking the process of the steam turbine speed increasing from 0 to the rated speed of 3000rpm as an example: First, when the operator issues a speed increase command on the turbine control system, the input module collects the speed increase command contact closure signal (24V DC signal) and the initial control valve opening signal (4-20mA analog signal, about 5% opening at this time). These signals are transmitted to the main module via the backplane bus.
[0061] During the program execution stage, the main module calculates through a mathematical model based on the current 0 speed state and the received control signal: main steam pressure: gradually increases from 0 to the rated value of 7MPa; main steam temperature: gradually increases to the rated value of 538℃; bearing vibration: fluctuates in the range of 25μm-45μm with speed changes; rotor speed: gradually increases at an acceleration rate of about 150rpm / min; high-pressure cylinder exhaust pressure: gradually increases from 0 to 2.1MPa; and other related process parameters.
[0062] These calculated parameters are converted into standard 4-20mA current signals through the output module and output to the control system. At the same time, the calculated speed value is converted into a pulse signal by the frequency output module. For example, when the speed reaches 1500rpm, the frequency output module will output a 500Hz square wave pulse (assuming the gear ring has 120 teeth).
[0063] During the speed increase process, the operator can monitor the changing trends of various parameters in real time through the host computer. If the fault response characteristics of the control system need to be verified, the vibration value of a certain bearing can be forced to be modified to 100μm through the host computer to simulate the bearing fault condition. At this time, the output module will output abnormal vibration parameters to verify whether the protection function of the control system can be activated in time.
[0064] In this way, all feedback signals received by the control system during the entire speed-up process are completely consistent with the actual unit operation. This allows the various functions of the control system, including speed control, vibration protection, vacuum protection, etc., to be fully verified. In particular, some fault condition tests that are difficult to perform on actual units can be completed safely and reliably through the simulation device.
[0065] For example, the following control functions can be verified during the above speed-up process: dynamic characteristics of the speed control loop, acceleration rate limiting function, critical speed zone fast passing function, vibration protection function, overspeed protection function, vacuum protection function and axial displacement protection function, etc.
[0066] The present application also discloses a steam turbine simulation method based on PLC technology, such as Figure 2 As shown, Figure 2 : is a flow chart of a steam turbine simulation method based on PLC technology provided in an embodiment of the present application, which specifically includes S101-S104: S101, receiving a control signal sent by a steam turbine control system; S102, executing a simulation configuration program for simulating the operation characteristics of the steam turbine according to the control signal, and calculating simulation operation parameters and speed values under corresponding working conditions; S103, sending the simulation operation parameters to the steam turbine control system; S104, converting the received rotation speed value into a pulse signal of a corresponding frequency, and sending the pulse signal to the steam turbine control system.
[0067] This embodiment provides a steam turbine simulation method based on PLC technology, which provides a comprehensive test environment for the verification of the control system by simulating the operating characteristics of the steam turbine. In order to ensure that the simulation process can truly reflect the dynamic characteristics of the steam turbine, the method adopts a closed-loop signal interaction mechanism to achieve real-time response of the control signal and timely feedback of the state parameters.
[0068] In the specific implementation process, the input module first receives various control signals from the turbine control system. These signals include analog control valve opening instructions, interception valve opening instructions, etc., as well as digital control instructions such as speed increase instructions and speed reduction instructions. After the input module collects these control signals, it transmits them to the main module through the backplane bus. This signal acquisition mechanism ensures that the simulation device can respond to various operation instructions of the control system in real time.
[0069] After receiving the control signal, the main module immediately executes the pre-downloaded simulation configuration program. This program is based on a complete mathematical model of the steam turbine and can accurately describe the operating characteristics of the steam turbine under different operating conditions. During the execution of the program, the main module calculates various simulation operating parameters under the corresponding operating conditions according to the received control signal, including important parameters such as main steam pressure, exhaust pressure, bearing vibration, and also calculates the real-time speed value of the rotor. This real-time calculation based on the mathematical model ensures that the simulation results are highly consistent with the actual operating characteristics of the steam turbine.
[0070] After the calculation is completed, the output module sends the simulation operation parameters to the turbine control system in the form of a standard current signal. These parameters fully reflect the operating status of the simulated turbine under the current working conditions, so that the control system can obtain process quantity feedback that is completely consistent with the actual operation. At the same time, the frequency output module receives the speed value calculated by the main module and converts it into a pulse signal of the corresponding frequency. This special frequency output design ensures the accuracy of the speed signal and provides accurate speed feedback for the control system.
[0071] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.
Claims
1. A steam turbine simulation device based on PLC technology, characterized in that: The device comprises: a main module, an input module, an output module and a frequency output module; wherein, The input module is used to receive a control signal sent by the steam turbine control system and send the control signal to the main module via a backplane bus; The main module is used to execute a simulation configuration program simulating the operation characteristics of the steam turbine according to the control signal, calculate the simulation operation parameters and the speed value under the corresponding working conditions, and send the simulation operation parameters to the output module through the backplane bus, and send the speed value to the frequency output module through the backplane bus; The output module is used to send the simulation operation parameters to the steam turbine control system; The frequency output module is used to convert the received rotation speed value into a pulse signal of a corresponding frequency, and send the pulse signal to the steam turbine control system.
2. The steam turbine simulation device based on PLC technology according to claim 1 is characterized in that: The input module includes: an analog input module and a digital input module; wherein, The analog input module is used to receive the analog control signal sent by the steam turbine control system; The digital quantity input module is used to receive the switch quantity control signal sent by the steam turbine control system.
3. The steam turbine simulation device based on PLC technology according to claim 2 is characterized in that: The analog input module is used to receive analog control signals of -50~50mA; the digital input module adopts dry contact input mode.
4. The steam turbine simulation device based on PLC technology according to claim 1 is characterized in that: The output module includes: an analog output module and a digital output module; wherein, The analog output module is used to send analog simulation parameters to the steam turbine control system; The digital quantity output module is used to send switch quantity simulation parameters to the steam turbine control system.
5. According to the steam turbine simulation device based on PLC technology according to claim 4, it is characterized in that: The analog output module is used to output 4~20mA analog simulation parameters; the digital output module adopts relay output mode.
6. The steam turbine simulation device based on PLC technology according to claim 1 is characterized in that: The input module, the output module and the frequency output module are connected to the steam turbine control system by hard wiring; the frequency output module is used to output a pulse signal of 1 Hz to 10 kHz.
7. The steam turbine simulation device based on PLC technology according to claim 1 is characterized in that: The main module is connected to the host computer for communication, and is also used for receiving the simulation configuration program downloaded by the host computer and responding to the online debugging instruction of the host computer.
8. A steam turbine simulation method based on PLC technology, characterized in that: The method comprises: Receive control signals sent by the steam turbine control system; According to the control signal, a simulation configuration program simulating the operation characteristics of the steam turbine is executed to calculate the simulation operation parameters and speed values under the corresponding working conditions; sending the simulation operation parameters to the steam turbine control system; The received rotation speed value is converted into a pulse signal of corresponding frequency, and the pulse signal is sent to the steam turbine control system.