Steam turbine generator unit adjustment semi-physical simulation system based on DEH in-loop
Through the DEH-in-ring steam turbine generator set adjustment semi-physical simulation system, the adjustment control cabinet, electro-hydraulic actuator and load simulation device are used to realize the high-precision simulation verification of the steam turbine generator set adjustment control system, solving the existing technology The problem of insufficient accuracy of simulation verification in the process reduces the experimental resource requirements and improves the accuracy and fidelity of simulation.
Patent Information
- Application Number
- CN202420959918.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-05-06
AI Technical Summary
The simulation verification accuracy and applicability of existing steam turbine generator set adjustment systems are insufficient, especially in terms of variable working conditions and control system algorithm verification, and the test resources are high.
A semi-physical simulation system for adjusting steam turbine generator sets based on DEH in-ring is designed, including adjustment control cabinets, electro-hydraulic actuators, load simulation devices and turbine models, and high-precision simulation verification is achieved through simulation machines to reduce the demand for test resources. The system adopts an embedded speed control controller, a double-acting hydraulic cylinder and a controllable overflow valve to simulate the complex characteristics of the electro-hydraulic actuator and improve the realisticity of the simulation.
It realizes high-precision simulation verification of the steam turbine generator set adjustment control system, reduces the system modeling complexity and test resource requirements, and improves the simulation accuracy and fidelity.
Smart Images
Figure CN222145410U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a performance simulation system of a steam turbine regulating system, in particular to a semi-physical simulation system for regulating a steam turbine generator set. Background Art
[0002] Regulation performance is one of the important performance indicators of steam turbine generator sets. At present, the regulation system of steam turbine generator sets usually adopts DEH electro-hydraulic regulation system, such as Figure 1 As shown in the figure, the regulation system is mainly composed of sensors, regulation controllers, servo control cards, electro-hydraulic actuators and other parts. The sensors detect parameters such as turbine speed, generator power, and electro-hydraulic actuator displacement. The regulation controller outputs control instructions to the servo control card based on the turbine speed and power-related parameters detected and fed back. The servo control card drives the electro-hydraulic conversion valve to realize the conversion of electrical control signals to hydraulic control signals, so that the hydraulic actuator realizes the position opening control of the turbine steam inlet regulating valve, adjusts the steam flow entering the turbine to complete the control and regulation of the turbine.
[0003] The simulation of the steam turbine regulation system needs to consider the characteristics of its regulation control system and the characteristics of the steam turbine. At present, the modeling and simulation of steam turbines and their regulation systems usually adopt the following two methods.
[0004] One approach is a modeling method based on the transfer functions of each link of the steam turbine and the regulation system. The main representative of this method is the classic mathematical model of the steam turbine regulation system provided by the Institute of Electrical and Electronics Engineers (IEEE), which includes the characteristic models of typical links in the steam turbine and the regulation system, such as steam volume, rotor, steam turbine power, speed governor, electro-hydraulic servo actuator, etc. This method focuses on describing the external characteristic response of the object.
[0005] Such as the rotor power model equation:
[0006]
[0007] In the formula is the rotor take-off time constant, β is the self-balancing coefficient,
[0008]
[0009] Such as the steam volume model equation:
[0010]
[0011] In the formula is the volume time constant, and its physical meaning is: the steam flow rate is the rated flow rate Q 0 When the steam flow rate in the volume increases from zero to m 0 =Vρ0 The time required.
[0012] Through the method of parameter identification, the characteristic parameters of the unit such as the rotor lift time constant, steam volume time constant, oil motor time constant, etc. are obtained to realize the construction of the characteristic model of each link in the steam turbine and the regulation system. However, this method is based on the assumption of ideal work of the steam turbine, and the relevant links in the actual steam turbine and the regulation system are linearly and simplified. The model mainly reflects the dynamic regulation performance of the regulation system, and is limited by parameter identification. The simulation verification accuracy and applicability of the variable working conditions of the steam turbine and the control system algorithm are insufficient.
[0013] Another way is to use a modeling method based on the mechanism characteristic expressions of each link of the steam turbine and the regulating system. This method is oriented to the actual physical objects of the steam turbine and the speed regulating system, and establishes a mathematical expression model that describes the input and output parameters of the physical objects and their characteristic relationships. This method can focus on reflecting the internal characteristics of the object.
[0014] For example, the flow characteristic expression of the turbine control valve is:
[0015]
[0016]
[0017] Where μ represents the flow coefficient of the regulating valve (the pressure ratio before and after the valve is determined by the structure of the valve head and valve seat, and the pressure ratio before and after the valve), Q f It represents the flow rate through the regulating valve in kg / s, Acr represents the valve opening area in cm2 at the corresponding lift, P 0 Indicates the pressure before the regulating valve in MPa, V 0 Indicates the specific volume before the regulating valve in m3 / kg.
[0018] Through this modeling method, it is possible to accurately describe the characteristic changes of the modeling object under different input parameters and improve the accuracy of modeling simulation. However, this method requires accurate grasp and description of the mechanism characteristics of the physical object. The circuit characteristics and control algorithm modeling of the electronic controller, electro-hydraulic actuator and other object links are difficult and inaccurate, which limits the accuracy of the overall simulation. Therefore, it is necessary to design a semi-physical simulation system for steam turbine generator set regulation that can realize high-precision simulation verification of the performance of the steam turbine regulation control system and reduce the demand for experimental resources of the regulation control system. Summary of the invention
[0019] The utility model proposes a semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, which realizes high-precision simulation verification of steam turbine regulation control system performance and reduces the demand for experimental resources of the regulation control system.
[0020] To achieve the above-mentioned purpose, the technical solution of the utility model is: a semi-physical simulation system for regulating a steam turbine generator set based on DEH in the loop, comprising a regulating control cabinet, an electro-hydraulic actuator, a load simulation device, a steam turbine model and a simulator, the regulating control cabinet being connected to the electro-hydraulic actuator for collecting the parameter status of the electro-hydraulic actuator being regulated and controlled, and outputting a control command signal to the electro-hydraulic actuator; the electro-hydraulic actuator being connected to the steam turbine model and the simulator for converting the control command signal output by the regulating control cabinet into a hydraulic action, thereby realizing the opening control of the driven steam turbine model and the simulator position; the steam turbine model and the simulator are connected to the electro-hydraulic actuator through feedback from the load simulation device, for simulating the characteristics of the electro-hydraulic actuator when driving the load.
[0021] Furthermore, the regulating control cabinet includes a speed controller and a servo card, and the speed controller is connected to the electro-hydraulic actuator via the servo card.
[0022] Furthermore, the speed control cabinet adopts an embedded speed controller, equipped with analog and switch input and output modules, speed acquisition modules, and servo control modules.
[0023] Furthermore, the load simulation device adopts a double-acting hydraulic cylinder.
[0024] Furthermore, a tension pressure sensor is provided on the piston rod of the double-acting hydraulic cylinder of the load simulation device.
[0025] Furthermore, the upper and lower chambers of the double-acting hydraulic cylinder of the load simulation device are provided with overflow valves for protection.
[0026] Furthermore, a controllable overflow valve is provided at the inlet electro-hydraulic servo valve of the load simulation device.
[0027] Furthermore, the simulator is the running carrier of the steam turbine simulation model object and has an interface for the interaction between the model data and other physical devices.
[0028] Furthermore, the simulation machine adopts a simulation computing device with a real-time operating system from dSPACE, NIPXI or Linustron, and is equipped with different types of input and output modules.
[0029] Furthermore, the simulator transmits the speed signal of the steam turbine simulation model to the regulating controller through a pulse output module to ensure the accuracy of speed acquisition, and uses the current-type analog input card module to collect the output control valve load force signal and the LVDT acquisition card to collect the displacement sensor signal of the electro-hydraulic actuator.
[0030] The beneficial effects of the utility model are:
[0031] The utility model presents the DEH control system (speed controller, servo card) and electro-hydraulic actuator in the simulation object in a physical way, reducing the complexity of system modeling. The simulation machine runs the mechanism characteristic model of the steam turbine generator set to realize the simulation of the variable parameter working condition characteristics of the steam turbine generator set, and has the signal interaction function with the physical equipment. The electro-hydraulic actuator load simulation device realizes the simulation of the complex characteristics of the electro-hydraulic actuator, which improves the fidelity of the simulation. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is the principle diagram of steam turbine electro-hydraulic regulation control;
[0033] Figure 2 It is the schematic diagram of the semi-physical simulation system of the DEH-in-the-loop steam turbine generator regulation system;
[0034] Figure 3 It is a schematic diagram of a semi-physical simulation system for regulating a DEH-in-the-loop steam turbine generator set in an embodiment;
[0035] Figure 4 This is the schematic diagram of the load simulation device. DETAILED DESCRIPTION
[0036] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0037] like Figure 2 As shown, the utility model is a semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, which is composed of a regulating control cabinet (speed controller, servo card), an electro-hydraulic actuator, a load simulation device, a steam turbine model and a simulator. The regulating control cabinet (speed controller, servo card) is connected to the steam turbine model and the simulator through an electro-hydraulic actuator, and the steam turbine model and the simulator are connected to the electro-hydraulic actuator through feedback of the load simulation device. Among them:
[0038] The regulating control cabinet is a part of the physical object in the loop of the simulation system, which realizes the acquisition of parameter status of the regulating control object, and outputs the control command signal to the electro-hydraulic actuator after processing.
[0039] The electro-hydraulic actuator is a part of the physical object in the loop of the simulation system. It converts the control command signal output by the regulating control cabinet into hydraulic action to achieve the opening control of the position of the driven equipment.
[0040] The load simulation device is a simulation device, which generates an output force to act on the electro-hydraulic actuator under the control of the regulating system according to the load force of the turbine regulating valve of the simulation machine, so as to simulate the characteristics of the electro-hydraulic actuator when driving the load.
[0041] The simulator is the running carrier of the steam turbine simulation model object. It has an interface for interacting model data with other physical devices. It can perform calculations based on the input control valve opening, and output steam turbine generator set characteristic data such as turbine speed, generator power, and control valve load capacity, thereby realizing the simulation of steam turbine generator set characteristics.
[0042] Example:
[0043] The semi-physical simulation device of the steam turbine generator set regulation system based on DEH in the loop consists of a speed control cabinet (including speed controller, servo card) 1, an electro-hydraulic actuator 2, a load simulation device 3, and a real-time simulation machine 4. Figure 3 .
[0044] The speed control cabinet 1 is based on a general embedded controller and is equipped with general-type input and output modules such as analog and switch quantities, speed acquisition modules, servo control modules, etc. to realize signal acquisition and output of control instructions.
[0045] The load simulation device 3 generates a driving force to the steam turbine speed regulating electro-hydraulic actuator 2 through the hydraulic cylinder 5 under the action of the regulating control system according to the magnitude of the regulating valve load force output by the simulator, simulating the change of the steam distribution regulating valve load force during the actual operation of the steam turbine. The load simulation device adopts a double-acting hydraulic cylinder form, and adjusts the hydraulic oil pressure difference between the upper and lower chambers of the load simulation device cylinder based on the electro-hydraulic servo valve, thereby generating hydraulic pressure. A tension pressure sensor 6 is set on the piston rod of the load simulation device, which can detect the magnitude and direction of the output force and feed it back to the regulating control system to achieve closed-loop control of the output force, see Figure 4 .
[0046] The upper and lower chambers of the oil cylinder of the load simulation device are provided with relief valves 7 for protection. When the upper and lower chambers of the oil cylinder are over-pressured, the hydraulic oil is discharged through the relief valve 7. The electro-hydraulic servo valve 8 at the inlet of the load simulation device is provided with a controllable relief valve 9 to control the working oil pressure of the load simulation device, thereby changing the adjustable range of the output force of the load simulation device to meet the testing requirements of different systems.
[0047] The real-time simulator 4 can use simulation computing equipment with real-time operating systems from brands such as dSPACE, NIPXI, and Lingsi Chuangqi. The simulator has model operation management functions and can be equipped with different types of input and output modules to achieve mapping and signal interaction between the model and the physical device channel. The simulator transmits the speed signal of the simulation model to the regulating controller through the pulse output module to ensure the accuracy of speed acquisition; the simulator collects and outputs signals such as the load force of the regulating valve through the current analog input card module; the simulator collects the displacement sensor signal of the electro-hydraulic actuator through the LVDT acquisition card.
Claims
1. A semi-physical simulation system for steam turbine generator regulation based on DEH in the loop, Features: It includes a regulating control cabinet, an electro-hydraulic actuator, a load simulation device, a steam turbine model and a simulator. The regulating control cabinet is connected to the electro-hydraulic actuator to collect the parameter status of the electro-hydraulic actuator being regulated and controlled, and output a control command signal to the electro-hydraulic actuator; the electro-hydraulic actuator is connected to the steam turbine model and the simulator to convert the control command signal output by the regulating control cabinet into a hydraulic action to achieve the opening control of the driven steam turbine model and the simulator position; the steam turbine model and the simulator are connected to the electro-hydraulic actuator through the load simulation device feedback to simulate the characteristics of the electro-hydraulic actuator when driving the load.
2. According to the DEH-in-the-loop steam turbine generator set regulation semi-physical simulation system according to claim 1, Features: The regulating control cabinet includes a speed controller and a servo card. The speed controller is connected to the electro-hydraulic actuator via the servo card.
3. According to the DEH-in-the-loop steam turbine generator set regulation semi-physical simulation system according to claim 1, Features: The speed control cabinet adopts an embedded speed controller, equipped with analog and switch input and output modules, speed acquisition modules, and servo control modules.
4. According to claim 1, the semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, Features: The load simulation device adopts a double-acting hydraulic cylinder.
5. According to claim 4, the semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, Features: A tension pressure sensor is arranged on the piston rod of the double-acting hydraulic cylinder of the load simulation device.
6. According to claim 4, the semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, Features: The upper and lower chambers of the double-acting hydraulic cylinder of the load simulation device are provided with overflow valves for protection.
7. According to claim 1, the semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, Features: A controllable relief valve is provided at the inlet electro-hydraulic servo valve of the load simulation device.
8. According to claim 1, the semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop, Features: The simulator is the running carrier of the steam turbine simulation model object and has an interface for the interaction between model data and other physical devices.
9. The semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop according to claim 8, Features: The simulation machine uses a simulation computing device with a real-time operating system from dSPACE, NIPXI or Linsi Chuangqi, and is equipped with different types of input and output modules.
10. The semi-physical simulation system for steam turbine generator set regulation based on DEH in the loop according to claim 8, Features: The simulator transmits the speed signal of the steam turbine simulation model to the regulating controller through the pulse output module to ensure the accuracy of speed acquisition, and uses the current type analog input card module to collect the output control valve load force signal and the LVDT acquisition card to collect the displacement sensor signal of the electro-hydraulic actuator.