Virtual test method for turboset based on mechanism data collaboration

Abstract

The invention discloses a mechanism data collaborative turboset virtual test method, relates to the technical field of digitization of ship power systems, and aims to solve the problems of high cost, long period and high risk of a traditional mode for obtaining stable operation data of a steam power turboset. Constructing a turboset system simulation model; inputting initial operation parameters of different working conditions into the turboset system simulation model to enable the turboset system simulation model to operate; the rotating speed, thermal power, motor power and steam flow data output by the turboset system simulation model at the t moment are collected, the valve opening degree at the t + 1 moment is obtained according to the data and input into the turboset system simulation model, and the turboset system simulation model is controlled to work according to the valve opening degree at the t + 1 moment; the rotating speed, the thermal power, the motor power and the steam flow data at the t + 1 moment are output, and the initial value of t is 1; and the valve opening degree and the output data of the turboset system simulation model in the preset operation time are obtained. The method is used for obtaining the output data.

Description

Technical Field

[0001] The invention relates to the technical field of digitalization of ship power systems, and belongs to thermal performance analysis and virtual testing of steam power turbine units. Background Art

[0002] In modern ship power systems, efficient and reliable operation of steam turbine units is crucial to improving ship performance and reducing operating costs. Traditionally, actual steam turbine units are used for experiments to obtain data that can enable the stable operation of steam turbine units. However, the existing method has the problems of high cost and long experimental cycle, and may cause damage to the steam turbine units. Therefore, this method is high-risk. With the development of computer simulation technology, virtual experiments combined with actual equipment operation data provide a new solution for optimizing the performance of steam turbine units. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of high cost, long cycle and high risk in the traditional method of using actual steam-powered steam turbine units for experiments to obtain data that can enable the steam-powered steam turbine units to operate stably. A virtual test method for steam turbine units coordinated with mechanism data is proposed.

[0004] A steam turbine unit virtual test method with mechanism data collaboration, the method comprising the following contents:

[0005] Step 1: construct a steam turbine model, a condenser model, a vacuum pump model and a regulating valve model, and merge all the constructed models into a steam turbine unit system simulation model;

[0006] Step 2: inputting initial operating parameters of different operating conditions into the steam turbine unit system simulation model to operate the steam turbine unit system simulation model;

[0007] Step 3, collecting the speed, thermal power, motor power and steam flow data output by the steam turbine system simulation model at time t, obtaining the valve opening at time t+1 based on the data, inputting the data into the steam turbine system simulation model, controlling the steam turbine system simulation model to work according to the valve opening at time t+1, outputting the speed, thermal power, motor power and steam flow data at time t+1, and the initial value of t is 1;

[0008] Step 4, determine whether the operating time between the 1st moment and the tth moment is equal to the preset operating time. If so, the steam turbine unit system simulation model stops working, and obtains the corresponding valve opening at each moment during the operating time and the corresponding speed, thermal power, motor power and steam flow data output by the steam turbine unit system simulation model. If not, set t=t+1 and execute step 3.

[0009] Preferably, the steam turbine model is constructed in the following manner:

[0010] A steam turbine thermodynamic model is established, and the steam turbine thermodynamic model is constrained using steam flow data, expansion data, and operating parameters to obtain a steam turbine model.

[0011] Preferably, the condenser model is constructed in the following manner:

[0012] A heat exchange model of the condenser is established, and the condenser model is obtained by constraining the heat exchange model of the condenser using the condensation process of water vapor, heat transfer efficiency, cooling water flow and pressure characteristics in the condenser cavity.

[0013] Preferably, the vacuum pump model is constructed in the following manner:

[0014] The vacuum pump model is constructed using the vacuum pump ejection coefficient.

[0015] Preferably, the control valve model is constructed in the following manner:

[0016] A flow characteristic model of the control valve is established to simulate the flow characteristics of the control valve at different openings. Combined with the valve resistance characteristic test data, a flow resistance characteristic model of the control valve is established.

[0017] Preferably, in step 3, the electro-hydraulic actuator obtains the valve opening according to the rotation speed, thermal power, motor power and steam flow data.

[0018] Preferably, in step 2, the different operating conditions include dynamic operating conditions and steady-state operating conditions.

[0019] The beneficial effects of the present invention are:

[0020] The present invention constructs a simulation model of a steam turbine unit system, simulates the operation of the steam turbine unit in a model manner, and obtains the valve opening at the next moment based on the output at the previous moment, thereby controlling the stable operation of the steam turbine unit model and obtaining stable operating data, which is used in a real steam turbine unit to make the real steam turbine unit operate stably according to these parameters. Therefore, the simulation model and data-driven model based on physical principles in this application improve the ability to capture the complex dynamic characteristics of the steam turbine unit and enhance the accuracy and timeliness of the simulation results.

[0021] The present invention utilizes a virtual experiment platform to replace physical experiments, significantly reducing equipment wear and failure risks, and lowering material consumption and maintenance costs.

[0022] The present invention adopts a modular design, and each component and functional module is easy to integrate and expand, so as to adapt to the changing needs of different types of steam turbine units and complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the schematic diagram of the virtual test system for steam turbine units;

[0024] Figure 2A flow chart of the steam turbine unit virtual test method for mechanism data collaboration;

[0025] Figure 3 It is a schematic diagram of the steam turbine model;

[0026] Figure 4 It is the schematic diagram of the condenser model;

[0027] Figure 5 It is a schematic diagram of the steam turbine system;

[0028] Figure 6 It is a schematic diagram of data communication between simulation model and physical equipment;

[0029] Figure 7 Schematic diagram of the virtual test results of the steam turbine unit. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] Example:

[0034] A steam turbine unit virtual test method with mechanism data collaboration, the method comprising the following contents:

[0035] Step 1: construct a steam turbine model, a condenser model, a vacuum pump model and a regulating valve model, and merge all the constructed models into a steam turbine unit system simulation model;

[0036] Step 2: inputting initial operating parameters of different operating conditions into the steam turbine unit system simulation model to operate the steam turbine unit system simulation model;

[0037] Step 3, collecting the speed, thermal power, motor power and steam flow data output by the steam turbine system simulation model at time t, obtaining the valve opening at time t+1 based on the data, inputting the data into the steam turbine system simulation model, controlling the steam turbine system simulation model to work according to the valve opening at time t+1, outputting the speed, thermal power, motor power and steam flow data at time t+1, and the initial value of t is 1;

[0038] Step 4, determine whether the operating time between the 1st moment and the tth moment is equal to the preset operating time. If so, the steam turbine unit system simulation model stops working, and obtains the corresponding valve opening at each moment during the operating time and the corresponding speed, thermal power, motor power and steam flow data output by the steam turbine unit system simulation model. If not, set t=t+1 and execute step 3.

[0039] Specifically, the steam turbine system simulation model is a fusion model built on the Modelica multi-domain unified modeling and simulation platform. It combines physical simulation and data-driven technology to ensure the accuracy and adaptability of the model, so that it can accurately reflect the actual operating status of the steam turbine. At the same time, the electro-hydraulic actuator controller, as a physical device, ensures the accuracy and reliability of the actual equipment operation. The data acquisition system realizes data synchronization between the simulation model and the physical electro-hydraulic actuator controller based on the Modbus communication method, and then carries out virtual tests on the thermal performance of the steam turbine unit, promoting the comprehensive improvement and dynamic optimization of the thermal performance of the steam turbine unit.

[0040] Based on the constructed models of key equipment such as steam turbine, condenser, vacuum pump, regulating valve, etc., analyze the system principle topology diagram, clarify the connection relationship, interface type and signal transmission path between each device, and then integrate and debug the simulation model to ensure logical connection according to the topology diagram, and finally obtain the steam turbine unit system simulation model, such as Figure 5 shown.

[0041] Further defining, the steam turbine model is constructed in the following way:

[0042] A steam turbine thermodynamic model is established, and the steam turbine thermodynamic model is constrained using steam flow data, expansion data, and operating parameters to obtain a steam turbine model.

[0043] Specifically, a thermodynamic model of a multi-stage steam turbine is constructed, and a mechanism model of steam flow, expansion process, and operating parameters (such as flow, pressure, and temperature) is constructed based on the turbine velocity triangle theory. Using historical operating data, a data proxy model is constructed based on a long- and short-time neural network algorithm to supplement parts that are difficult to directly physically model, such as the stage enthalpy drop loss and steam leakage of a multi-stage steam turbine.

[0044] Further definition, the condenser model is constructed in the following way:

[0045] A heat exchange model of the condenser is established, and the condenser model is obtained by constraining the heat exchange model of the condenser using the condensation process of water vapor, heat transfer efficiency, cooling water flow and pressure characteristics in the condenser cavity.

[0046] Specifically, a heat exchange model of the condenser is established, and the fluid dynamics equation and the heat conduction equation are combined to simulate the condensation process of water vapor, heat exchange efficiency, cooling water flow, and pressure characteristics in the condenser cavity. Combined with the test data, the performance of the condenser is corrected and optimized, for example, the simulation model is corrected by measuring the cavity pressure data to improve the accuracy of the model.

[0047] Further defining, the way the vacuum pump model is constructed:

[0048] The vacuum pump model is constructed using the vacuum pump ejection coefficient.

[0049] Specifically, the vacuum extractor model mainly uses high-temperature and high-pressure steam to eject steam to achieve the purpose of extracting vacuum. Therefore, the vacuum extractor ejection coefficient proxy model is constructed in combination with equipment test data.

[0050] Further definition, the construction method of the control valve model is:

[0051] A flow characteristic model of the control valve is established to simulate the flow characteristics of the control valve at different openings. Combined with the valve resistance characteristic test data, a flow resistance characteristic model of the control valve is established.

[0052] Specifically, combined with the valve resistance characteristic test data, the flow rate and pressure drop values ​​at different openings obtained in the experiment are analyzed to establish the valve flow resistance characteristic model. Select an appropriate interpolation or fitting method, such as polynomial fitting, spline interpolation, or nonlinear regression, to create a smooth flow resistance curve that captures the relationship between flow and pressure drop. In this process, the coefficient of determination (R 2 The model’s fit is evaluated by statistical indicators such as error (value) and residual analysis to ensure that the established model not only accurately reflects the flow characteristics of the valve under typical operating conditions, but is also suitable for calculation and simulation under different working conditions.

[0053] It is further defined that in step 3, the electro-hydraulic actuator obtains the valve opening according to the rotational speed, thermal power, motor power and steam flow data.

[0054] Specifically, the response speed of the electro-hydraulic actuator is adjusted according to the requirements of different working conditions to ensure its rapid response and stability under full load, partial load and start-stop conditions.

[0055] High-precision sensors are configured at key positions of the electro-hydraulic actuator controller, and different data collection frequencies are set according to the requirements of different working conditions to ensure the authenticity and accuracy of the data.

[0056] According to the specific requirements of full load, partial load and start-stop conditions, select an electro-hydraulic actuator controller with high response speed and high stability to ensure that it can adapt to different working conditions. After the physical equipment is installed, conduct multi-condition tests to verify the performance of the actuator in terms of fast response and stability, record relevant data and analyze them to ensure that they meet the design requirements.

[0057] Install high-precision sensors at key locations of the electro-hydraulic actuator controller, including pressure, temperature, displacement, flow and other types. When selecting sensors, ensure that the accuracy meets the requirements. Equipped with a suitable data acquisition card, the sensor data is transmitted to the data storage server in real time through a high-speed data transmission channel. After the system integration is completed, the ability of the sensor and the data acquisition card to work together is verified through comprehensive testing to ensure the authenticity and reliability of the data, providing a data basis for subsequent system optimization.

[0058] According to the on-site network environment and data acquisition equipment support, the domestic data acquisition equipment uses the ModbusRTU protocol. However, considering that Modbus TCP is given priority in the wired network environment to improve data transmission speed and stability, the intermediate gateway is used to convert the Modbus RTU protocol to the Modbus TCP protocol, and the simulation data is transmitted in the form of IEEE754, such as Figure 6 . Define the data mapping relationship between the simulation model and the real-time data acquisition system in detail to ensure that each key parameter (such as turbine speed, flow, pressure, etc.) can accurately correspond between the simulation model and the data acquisition system. According to the operating characteristics of the steam turbine unit and the simulation requirements, set the update frequency of real-time data synchronization to ensure that the simulation model can reflect the real-time status of the equipment in a timely manner.

[0059] It is further defined that in step 2, different operating conditions include dynamic operating conditions and steady-state operating conditions.

[0060] Specifically, the virtual test of the steam turbine unit is mainly carried out around steady-state conditions and dynamic conditions. The steady-state condition simulates the state of the unit when it is running stably under rated load or partial load, focusing on analyzing the key parameters of the unit pressure, flow, power and efficiency in the stable operation of the system. The dynamic condition mainly simulates the dynamic adjustment process of the unit under different load demands, including load increase and load decrease, focusing on analyzing the stability and response speed of the system during the dynamic adjustment process.

[0061] Given the upstream and downstream parameter boundaries of the steam turbine unit model, virtual tests are carried out during the unit startup and power increase process, the stable process under rated load and partial load, and the rapid load increase / decrease process. Finally, the unit speed, thermal power, motor power and steam flow results are obtained as follows: Figure 7 shown.

[0062] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A steam turbine unit virtual test method with mechanism data collaboration, characterized in that: The method comprises the following: Step 1: construct a steam turbine model, a condenser model, a vacuum pump model and a regulating valve model, and merge all the constructed models into a steam turbine unit system simulation model; Step 2: inputting initial operating parameters of different operating conditions into the steam turbine unit system simulation model to operate the steam turbine unit system simulation model; Step 3, collecting the speed, thermal power, motor power and steam flow data output by the steam turbine system simulation model at time t, obtaining the valve opening at time t+1 based on the data, inputting the data into the steam turbine system simulation model, controlling the steam turbine system simulation model to work according to the valve opening at time t+1, outputting the speed, thermal power, motor power and steam flow data at time t+1, and the initial value of t is 1; Step 4, determine whether the operating time between the 1st moment and the tth moment is equal to the preset operating time. If so, the steam turbine unit system simulation model stops working, and obtains the corresponding valve opening at each moment during the operating time and the corresponding speed, thermal power, motor power and steam flow data output by the steam turbine unit system simulation model. If not, set t=t+1 and execute step 3.

2. The steam turbine unit virtual test method with mechanism data collaboration according to claim 1 is characterized in that: How the steam turbine model is constructed: A steam turbine thermodynamic model is established, and the steam turbine thermodynamic model is constrained using steam flow data, expansion data, and operating parameters to obtain a steam turbine model.

3. The steam turbine unit virtual test method with mechanism data collaboration according to claim 1 is characterized in that: How to build the condenser model: A heat exchange model of the condenser is established, and the condenser model is obtained by constraining the heat exchange model of the condenser using the condensation process of water vapor, heat transfer efficiency, cooling water flow and pressure characteristics in the condenser cavity.

4. The steam turbine unit virtual test method with mechanism data collaboration according to claim 1 is characterized in that: How the vacuum pump model is constructed: The vacuum pump model is constructed using the vacuum pump ejection coefficient.

5. The steam turbine unit virtual test method with mechanism data collaboration according to claim 1 is characterized in that: How to build the control valve model: A flow characteristic model of the control valve is established to simulate the flow characteristics of the control valve at different openings. Combined with the valve resistance characteristic test data, a flow resistance characteristic model of the control valve is established.

6. The steam turbine unit virtual test method with mechanism data collaboration according to claim 1 is characterized in that: In step 3, the electro-hydraulic actuator obtains the valve opening according to the speed, thermal power, motor power and steam flow data.

7. The steam turbine unit virtual test method with mechanism data collaboration according to claim 1 is characterized in that: In step 2, different operating conditions include dynamic operating conditions and steady-state operating conditions.

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