A dynamic regulation simulation method, device and equipment for a non-adjustable extraction steam turbine

Abstract

A dynamic regulation simulation method, device and equipment for a non-adjustable extraction steam turbine provided by the present application relate to the technical field of steam turbine control. This method calculates the pressure behind the regulating valve according to the initial speed of the non-adjustable extraction steam turbine; according to the pressure behind the regulating valve and the load power parameters of the non-adjustable extraction steam turbine, through the preset rotor equation of the non-adjustable extraction steam turbine, the target speed of the non-adjustable extraction steam turbine is calculated. Thus, it avoids using an actual non-adjustable extraction steam turbine for dynamic characteristic tests, saves manpower and material resources, reduces the test cost of the actual unit, and can also efficiently obtain the dynamic characteristics of the non-adjustable extraction steam turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine control, and more particularly, to a dynamic regulation simulation method, device and equipment for a non-adjustable extraction steam turbine. Background Art

[0002] Understanding the characteristics of the regulation system of a non-adjustable extraction steam turbine is a prerequisite and basis for designing the regulation system of a non-adjustable extraction steam turbine, and is also an important reference for solving regulation system failures. According to the static characteristics, each component in the regulation system can be designed to obtain a one-to-one correspondence; however, the static characteristics cannot fully reflect the performance of a regulation system. According to the static characteristics of the regulation system, only the change results of each parameter can be reflected, while the change process of each parameter cannot be explained. The dynamic characteristics of the regulation system can show the change laws of each regulated parameter, and can understand the influence of each relevant factor on the performance of the regulation system and the improvement measures.

[0003] To obtain the dynamic characteristics of the regulation system of a non-adjustable extraction steam turbine, the most intuitive method is to conduct a dynamic characteristic test. However, to conduct such a test, a large amount of financial and human resources are required. Therefore, there is an urgent need for an efficient method to obtain the dynamic characteristics of the regulation system of a non-adjustable extraction steam turbine. Summary of the Invention

[0004] The purpose of the present invention is to provide a dynamic regulation simulation method, device and equipment for a non-adjustable extraction steam turbine, aiming at the deficiencies in the above-mentioned prior art, so as to solve the problems such as the need to consume a large amount of financial and human resources to obtain the dynamic characteristics of the regulation system of a non-adjustable extraction steam turbine in the prior art.

[0005] To achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a dynamic regulation simulation method for a non-adjustable extraction steam turbine, where the non-adjustable extraction steam turbine is provided with a regulating valve, a cylinder steam chamber corresponding to the regulating valve, and a rotor; the method includes:

[0007] Calculate the pressure behind the regulating valve according to the initial speed of the non-adjustable extraction steam turbine;

[0008] Calculate the target speed of the non-adjustable extraction steam turbine through a preset rotor equation of the non-adjustable extraction steam turbine according to the pressure behind the regulating valve and the load power parameter of the non-adjustable extraction steam turbine.

[0009] Optionally, the calculating the pressure behind the regulating valve according to the initial speed of the non-adjustable extraction steam turbine includes:

[0010] Based on the initial speed of the non - adjustable extraction steam turbine, use the preset proportional - integral - derivative controller of the non - adjustable extraction steam turbine to calculate the control current of the regulating valve;

[0011] Based on the control current of the regulating valve, use the control model corresponding to the regulating valve to calculate the pressure behind the regulating valve.

[0012] Optionally, the control model corresponding to the regulating valve includes: an electro - hydraulic converter module, a pilot valve and servomotor module, and a volume module; the step of calculating the pressure behind the regulating valve according to the control current of the regulating valve by using the control model corresponding to the regulating valve includes:

[0013] Based on the control current of the regulating valve, use the electro - hydraulic converter module to calculate the secondary oil pressure parameter;

[0014] Based on the secondary oil pressure parameter, use the pilot valve and servomotor module to calculate the valve position parameter of the regulating valve;

[0015] Based on the valve position parameter of the regulating valve, use the volume module to calculate the pressure behind the regulating valve.

[0016] Optionally, the method further includes:

[0017] Generate a valve position response curve of the regulating valve according to the valve position parameters of the regulating valve calculated within a preset time period.

[0018] Optionally, the method further includes:

[0019] Recalculate the pressure behind the regulating valve according to the target speed of the non - adjustable extraction steam turbine;

[0020] According to the recalculated pressure behind the regulating valve and the load power parameter of the non - adjustable extraction steam turbine, use the preset rotor equation to recalculate the speed of the non - adjustable extraction steam turbine until the deviation between the recalculated speed and the given speed of the non - adjustable extraction steam turbine is within a preset deviation range.

[0021] Optionally, the step of recalculating the pressure behind the regulating valve according to the target speed of the non - adjustable extraction steam turbine includes:

[0022] Use the preset speed regulation rate module of the non - adjustable extraction steam turbine to update the target speed;

[0023] Calculate the speed deviation according to the updated target speed and the given speed;

[0024] Recalculate the pressure behind the regulating valve according to the speed deviation.

[0025] Optionally, the method further comprises:

[0026] A speed rise curve of the non-adjustable steam extraction type steam turbine is generated according to the speed calculated within a preset time period.

[0027] Optionally, the method further comprises:

[0028] A load response curve of the non-adjustable extraction steam turbine is generated according to the load power parameter corresponding to the rotational speed calculated within a preset time period.

[0029] In a second aspect, an embodiment of the present application provides a dynamic regulation simulation device for a non-adjustable steam extraction type steam turbine, wherein the non-adjustable steam extraction type steam turbine has a regulating valve, a cylinder steam chamber corresponding to the regulating valve, and a rotor; the device comprises:

[0030] A first calculation module, configured to calculate the valve rear pressure of the regulating valve according to the initial speed of the non-adjustable extraction steam turbine;

[0031] The second calculation module is used to calculate the target speed of the non-adjustable extraction steam turbine according to the valve rear pressure of the regulating valve and the load power parameter of the non-adjustable extraction steam turbine by using the preset rotor equation of the non-adjustable extraction steam turbine.

[0032] In a third aspect, an embodiment of the present application provides a simulation device, comprising: a processor and a storage medium, wherein the processor and the storage medium are communicatively connected via a bus, the storage medium stores program instructions executable by the processor, and the processor calls the program stored in the storage medium to execute the steps of the dynamic regulation simulation method of a non-adjustable extraction steam turbine as described in any one of the first aspects.

[0033] Compared with the prior art, this application has the following beneficial effects:

[0034] The present application provides a method, device and equipment for simulating dynamic regulation of a non-adjustable extraction steam turbine. The method calculates the valve back pressure of the regulating valve according to the initial speed of the non-adjustable extraction steam turbine; and calculates the target speed of the non-adjustable extraction steam turbine using the preset rotor equation of the non-adjustable extraction steam turbine according to the valve back pressure of the regulating valve and the load power parameter of the non-adjustable extraction steam turbine. Thus, it avoids the use of an actual non-adjustable extraction steam turbine for dynamic characteristic testing, saves manpower and material resources, reduces the test cost of the example unit, and can also efficiently obtain the dynamic characteristics of the non-adjustable extraction steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic flowchart of a dynamic regulation simulation method for a non-adjustable extraction steam turbine provided by an embodiment of the present application;

[0037] Figure 2 It is a schematic flowchart of a method for calculating the pressure behind the regulating valve according to the initial speed provided by an embodiment of the present application;

[0038] Figure 3 It is a schematic flowchart of a method for calculating the pressure behind the regulating valve according to the control current of the regulating valve provided by an embodiment of the present application;

[0039] Figure 4 It is a schematic flowchart of another dynamic regulation simulation method for a non-adjustable extraction steam turbine provided by the present application;

[0040] Figure 5 It is a schematic flowchart of a method for recalculating the pressure behind the regulating valve provided by an embodiment of the present application;

[0041] Figure 6 It is a schematic structural diagram of a dynamic regulation simulation model for a non-adjustable extraction steam turbine provided by an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of a dynamic regulation simulation device for a non-adjustable extraction steam turbine provided by an embodiment of the present application;

[0043] Figure 8 It is a schematic diagram of a simulation device provided by an embodiment of the present application.

[0044] Icons: 101 - Electro-hydraulic converter module, 102 - Pilot valve servomotor module, 103 - Regulating valve position module, 104 - Volume module, 200 - Rotor equation module, 300 - Preset proportional integral derivative control module, 400 - Speed output module, 500 - Load module, 600 - Given speed module, 700 - Speed droop module, 701 - First calculation module, 702 - Second calculation module, 801 - Processor, 802 - Storage medium. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0047] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0048] In addition, terms such as "first" and "second" are used only for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0049] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0050] To obtain the dynamic regulation characteristics of a non-adjustable extraction steam turbine, the present application provides a dynamic regulation simulation method, device, and equipment for a non-adjustable extraction steam turbine. By simulating the non-adjustable extraction steam turbine through the dynamic regulation simulation method, it is possible to avoid conducting dynamic characteristic tests on a real non-adjustable extraction steam turbine, saving manpower and material resources.

[0051] Before explaining the dynamic regulation simulation method for a non-adjustable extraction steam turbine, a non-adjustable extraction steam turbine will be introduced first. A non-adjustable extraction steam turbine is equipped with a control valve, a steam chamber corresponding to the control valve, and a rotor. The non-adjustable extraction steam turbine also includes a governor, an electro-hydraulic converter, and a pilot valve oil motor. The governor generates a control current based on the speed signal and transmits the control current to the electro-hydraulic converter; the electro-hydraulic converter generates a hydraulic signal based on the control current and transmits the hydraulic signal to the pilot valve. The moving position of the pilot valve spool determines the output direction of the oil motor, thereby driving the valve position of the control valve to change; the change in the valve position of the control valve causes a change in the steam pressure in the steam chamber corresponding to the control valve; the steam in the steam chamber drives the rotor to rotate, and then changes the speed of the rotor according to the change in steam pressure.

[0052] This application precisely analyzes the internal mechanism process and basic physical laws of the non-adjustable extraction steam turbine governing system, adopts appropriate and reasonable simplifications and assumptions, establishes the mathematical models of each module within the non-adjustable extraction steam turbine governing system, and obtains a dynamic regulation simulation method for the non-adjustable extraction steam turbine. Exemplarily, the non-adjustable extraction steam turbine includes: a condensing steam turbine, a back-pressure steam turbine, and various non-adjustable extraction steam turbines.

[0053] The following uses a specific example to explain a dynamic regulation simulation method for a non-adjustable extraction steam turbine provided by an embodiment of this application. Figure 1 The following is a schematic flowchart of a dynamic regulation simulation method for a non-adjustable extraction steam turbine provided by an embodiment of this application. The execution subject of this method can be a desktop computer, a laptop computer, etc. with computing and processing capabilities, which is not limited herein. As Figure 1 shown, this method includes:

[0054] S101. Calculate the pressure behind the regulating valve according to the initial speed of the non-adjustable extraction steam turbine.

[0055] After establishing the dynamic regulation simulation mathematical model of the non-adjustable extraction steam turbine, this dynamic regulation simulation mathematical model requires an initial input value to start the dynamic regulation simulation of the non-adjustable extraction steam turbine. Therefore, the initial speed of the non-adjustable extraction steam turbine can be set to start the dynamic regulation simulation mathematical model of the non-adjustable extraction steam turbine. The internal mechanism process and basic physical laws of the non-adjustable extraction steam turbine are simulated in the dynamic regulation simulation mathematical model of the non-adjustable extraction steam turbine. By substituting the initial speed into this dynamic regulation simulation mathematical model, the pressure behind the regulating valve corresponding to the control regulation for this initial speed in the non-adjustable extraction steam turbine can be calculated.

[0056] In actual calculation, first calculate the deviation between the initial speed and the given speed of the non-adjustable extraction steam turbine according to the initial speed of the non-adjustable extraction steam turbine and the given speed of the non-adjustable extraction steam turbine. If this deviation exceeds the preset deviation range, then calculate the pressure behind the regulating valve according to this deviation; if this deviation is within the preset deviation range, no calculation is performed, that is, this initial speed is within the normal range. The given speed and the preset deviation range of the non-adjustable extraction steam turbine can be set by the staff according to the actual situation of the non-adjustable extraction steam turbine. The given speed of the non-adjustable extraction steam turbine is the speed when the non-adjustable extraction steam turbine operates normally, and the preset deviation range is the speed deviation range when the non-adjustable extraction steam turbine operates normally.

[0057] Exemplarily, the initial rotational speed can be the rotational speed value when the non - adjustable extraction steam turbine experiences a load rejection. When the non - adjustable extraction steam turbine is operating normally, the rotational speed value when the non - adjustable extraction steam turbine experiences a load rejection can be obtained, which can be used to dynamically adjust the initial input value of the simulation mathematical model. Among them, load rejection refers to the reduction of the end - user electricity load (for example, the failure of large - scale electrical equipment or the power outage of lines in a large - area region, resulting in a decrease in the user's electricity consumption). The power generation of the steam turbine exceeds the amount delivered to the users. At this time, the steam turbine will perform an action to reduce the power generation to match the actual load.

[0058] It should be noted that during the process of dynamic regulation simulation of the non - adjustable extraction steam turbine in this application, different types of parameter calculations will be involved. For the convenience of simulation calculation, the numerical values used are all non - dimensional numbers. The non - dimensional numbers are obtained by non - dimensionalizing the numerical values of different types of parameters, and the non - dimensional numbers are input into the dynamic regulation simulation mathematical model to obtain the corresponding non - dimensional results. The corresponding numerical results are obtained by processing the non - dimensional results. Therefore, before inputting the initial rotational speed of the non - adjustable extraction steam turbine, it is necessary to perform non - dimensionalization processing on the initial rotational speed, and calculate the pressure behind the regulating valve (the change rate of the pressure behind the regulating valve) through the non - dimensionalized initial rotational speed. The specific non - dimensionalization method is not limited. For example, the standardization method and the proportion method in the linear non - dimensionalization method.

[0059] S102. According to the pressure behind the regulating valve and the load power parameter of the non - adjustable extraction steam turbine, calculate the target rotational speed of the non - adjustable extraction steam turbine through the preset rotor equation of the non - adjustable extraction steam turbine.

[0060] There is a regulating valve on the non - adjustable extraction steam turbine. Through the regulation of the regulating valve, the rotational speed of the non - adjustable extraction steam turbine can be adjusted. At the same time, the influencing factors of the preset load parameter are added to the calculation of the target rotational speed of the non - adjustable extraction steam turbine. Exemplarily, when the non - adjustable extraction steam turbine starts to reject load, the load parameter that the non - adjustable extraction steam turbine needs to reject is obtained. During the dynamic regulation simulation process, a preset load parameter is obtained, which is used to represent the load parameter that the non - adjustable extraction steam turbine needs to reject when starting to reject load. Among them, the preset load parameter represents the load power. When calculating the target rotational speed of the non - adjustable extraction steam turbine, the pressure behind the regulating valve and the load power parameter are comprehensively considered.

[0061] The preset rotor equation of the non - adjustable extraction steam turbine is shown in the following formula (1):

[0062]

[0063] Among them, Te is the rotor time constant, and the rotor time constant can be obtained in advance using parameters such as the moment of inertia and power; s1 is the input of the preset rotor equation. It should be noted that the input here is the input after Laplace transform, and the corresponding preset rotor equation is the Laplace equation; f1(s) is the output of the preset rotor equation.

[0064] Add the calculated dimensionless pressure after the regulating valve and the dimensionless load power parameter and substitute them into the preset rotor equation of the non - adjustable extraction steam turbine to obtain the dimensionless target speed, that is, the change rate compared to the initial speed. Further, the target speed of the non - adjustable extraction steam turbine can also be obtained based on the initial speed and the dimensionless target speed.

[0065] By establishing a dynamic regulation simulation method for non - adjustable extraction steam turbines, replacing the original method of obtaining the dynamic characteristics of steam turbines through the operation of example steam turbines, it saves manpower and material resources, reduces the test cost of example units, and brings convenience to the subsequent development of steam turbine regulation systems and fault handling.

[0066] In summary, a dynamic regulation simulation method for non - adjustable extraction steam turbines provided by an embodiment of the present application calculates the pressure after the regulating valve according to the initial speed of the non - adjustable extraction steam turbine; according to the pressure after the regulating valve and the load power parameter of the non - adjustable extraction steam turbine, uses the preset rotor equation of the non - adjustable extraction steam turbine to calculate the target speed of the non - adjustable extraction steam turbine. Thus, it avoids using a real non - adjustable extraction steam turbine for dynamic characteristic tests, saves manpower and material resources, reduces the test cost of example units, and can also efficiently obtain the dynamic characteristics of non - adjustable extraction steam turbines.

[0067] Figure 2 It is a schematic flow chart of a method for calculating the pressure after the regulating valve according to the initial speed provided by an embodiment of the present application. As Figure 2 shown, in S101, calculating the pressure after the regulating valve according to the initial speed of the non - adjustable extraction steam turbine includes:

[0068] S201. According to the initial speed of the non - adjustable extraction steam turbine, use the preset proportional - integral - derivative controller of the non - adjustable extraction steam turbine to calculate the control current of the regulating valve.

[0069] Calculate the deviation between the initial speed and the given speed of the non-adjustable extraction steam turbine. Substitute this deviation into the preset proportional-integral-derivative (PID) control equation of the non-adjustable extraction steam turbine to calculate the PID control quantity corresponding to this deviation. Calculate the comparison deviation between the PID control quantity and the preset load parameter, and use this comparison deviation as the control current of the regulating valve. For example, the preset load parameter is the load power value that needs to be shed during load rejection.

[0070] Specifically, the preset PID control equation is shown in the following formula (2):

[0071]

[0072] Where P is the proportional coefficient of the preset PID control equation, I is the integral coefficient of the preset PID control equation, D is the derivative coefficient of the preset PID control equation, and all can be preset according to the internal mechanism process and basic physical laws of the preset PID controller. s PID Is the input quantity of the preset PID control equation. It should be noted that the input quantity here is the input quantity after Laplace transform, and the corresponding preset PID control equation is the Laplace equation; PID(s) is the output quantity of the preset rotor equation. For example, the preset PID controller can be the speed governor in the non-adjustable extraction steam turbine.

[0073] Substitute the dimensionless initial speed into the preset PID control equation of the non-adjustable extraction steam turbine to calculate the control current of the dimensionless regulating valve, that is, the change rate of the control current of the regulating valve corresponding to the adjustment of the initial speed.

[0074] S202. According to the control current of the regulating valve, use the control model corresponding to the regulating valve to calculate the pressure behind the regulating valve.

[0075] The control current of the regulating valve is used to control the control link of the regulating valve. The control model corresponding to the regulating valve reflects the internal mechanism process and basic physical laws of the control link of the regulating valve in the actual non-adjustable extraction steam turbine. Therefore, according to the control current of the regulating valve, using the control model corresponding to the regulating valve, the pressure behind the regulating valve can be calculated. The pressure behind the regulating valve can represent the influence of the control link of the regulating valve on the speed of the non-adjustable extraction steam turbine.

[0076] Substitute the dimensionless control current of the regulating valve into the control model corresponding to the regulating valve to calculate the dimensionless pressure behind the regulating valve, that is, the change rate of the pressure behind the regulating valve corresponding to the adjustment of the initial speed.

[0077] In summary, in this embodiment, according to the initial speed of the non-adjustable extraction steam turbine, the control current of the control valve is calculated by using the preset proportional integral differential controller of the non-adjustable extraction steam turbine; according to the control current of the control valve, the control model corresponding to the control valve is used to calculate the pressure behind the control valve. Thus, through the simulation method, the pressure behind the control valve is accurately calculated, saving manpower and material resources and reducing the test cost of the example unit.

[0078] Figure 3 This is a schematic flow chart for calculating the pressure behind the control valve according to the control current of the control valve provided by the embodiment of the present application. As Figure 3 shown, the control model corresponding to the control valve includes: an electro-hydraulic converter module, a pilot valve and servomotor module, and a volume module; step S202 of calculating the pressure behind the control valve according to the control current of the control valve by using the control model corresponding to the control valve includes:

[0079] S301. According to the control current of the control valve, the secondary oil pressure parameter is calculated by using the electro-hydraulic converter module.

[0080] The electro-hydraulic converter module includes a preset electro-hydraulic conversion equation, and the electro-hydraulic converter module reflects the internal mechanism process and basic physical laws of the electro-hydraulic converter in the actual non-adjustable extraction steam turbine. According to the control current of the control valve, the secondary oil pressure parameter is calculated by using the electro-hydraulic converter module. That is, the secondary oil pressure parameter is obtained by controlling the electro-hydraulic converter according to the control current of the control valve.

[0081] Specifically, the preset electro-hydraulic conversion equation is shown as the following formula (3):

[0082]

[0083] where Ta is the time constant of the preset electro-hydraulic conversion equation, and the time constant of the preset electro-hydraulic conversion equation can be determined in advance according to the component configuration parameters in the regulation system; s2 is the input quantity of the preset electro-hydraulic conversion equation. It should be noted that the input quantity here is the input quantity after Laplace transform, and the corresponding preset electro-hydraulic conversion equation is a Laplace equation; f2(s) is the output quantity of the preset electro-hydraulic conversion equation.

[0084] The dimensionless control current of the control valve is substituted into the electro-hydraulic converter module to calculate the dimensionless secondary oil pressure parameter, that is, the change rate of the secondary oil pressure parameter corresponding to the adjustment of the initial speed.

[0085] S302. According to the secondary oil pressure parameter, the valve position parameter of the control valve is calculated by using the pilot valve and servomotor module.

[0086] The servomotor module of the pilot valve includes a preset servomotor equation of the pilot valve, and the servomotor module of the pilot valve reflects the internal mechanism process and basic physical laws of the servomotor of the pilot valve in an actual non-adjustable extraction steam turbine. According to the secondary oil pressure parameter, the valve position parameter of the regulating valve is calculated by using the servomotor module of the pilot valve. That is, the valve position parameter of the regulating valve is obtained by controlling the servomotor of the pilot valve according to the secondary oil pressure parameter.

[0087] Specifically, the preset servomotor equation of the pilot valve is shown in the following formula (4):

[0088]

[0089] Wherein, Tb is the time constant of the preset servomotor equation of the pilot valve, and the time constant of the preset servomotor equation of the pilot valve can be determined in advance according to the component configuration parameters in the regulating system; s3 is the input quantity of the preset servomotor equation of the pilot valve. It should be noted that the input quantity here is the input quantity after Laplace transform, and the corresponding preset servomotor equation of the pilot valve is a Laplace equation; f3(s) is the output quantity of the preset servomotor equation of the pilot valve.

[0090] Substitute the dimensionless secondary oil pressure parameter into the servomotor module of the pilot valve to calculate the dimensionless valve position parameter of the regulating valve, that is, the change rate of the valve position parameter of the regulating valve corresponding to the adjustment of the initial speed. Further, the numerical value of the valve position parameter of the regulating valve can be obtained according to the change rate of the valve position parameter of the regulating valve.

[0091] S303. According to the adjusted valve position parameter, the pressure behind the regulating valve is calculated by using the volume module.

[0092] The volume module includes a preset volume equation, and the volume module reflects the internal mechanism process and basic physical laws of the volume module in an actual non-adjustable extraction steam turbine. According to the valve position parameter of the regulating valve, the pressure behind the regulating valve is calculated by using the volume module. That is, the pressure behind the regulating valve is obtained by controlling the volume module according to the valve position parameter of the regulating valve.

[0093] Specifically, the preset volume equation is shown in the following formula (5):

[0094]

[0095] Wherein, Tc is the time constant of the preset volume equation, and the time constant of the preset volume equation can be determined in advance according to the steam turbine structure volume and flow rate; s4 is the input quantity of the preset volume equation. It should be noted that the input quantity here is the input quantity after Laplace transform, and the corresponding preset volume equation is a Laplace equation; f4(s) is the output quantity of the preset volume equation.

[0096] Substitute the dimensionless valve position parameter of the regulating valve into the volume module to calculate the pressure behind the regulating valve of the dimensionless regulating valve, that is, the pressure change rate of the regulating valve corresponding to the regulation of the initial speed. Further, the numerical value of the pressure behind the regulating valve of the regulating valve can also be obtained according to the pressure change rate of the regulating valve behind the valve.

[0097] In summary, in this embodiment, according to the control current of the regulating valve, the secondary oil pressure parameter is calculated by using the electro-hydraulic converter module; according to the secondary oil pressure parameter, the valve position parameter of the regulating valve is calculated by using the pilot valve oil motor module; according to the adjusted valve position parameter, the pressure behind the regulating valve is calculated by using the volume module. Thus, through the simulation method, the pressure behind the regulating valve is accurately calculated, saving manpower and material resources and reducing the test cost of the example unit.

[0098] Continue to refer to Figure 3 , the method may further include:

[0099] Generate a valve position response curve of the regulating valve according to the valve position parameter of the regulating valve calculated within a preset time period.

[0100] During a preset time period, multiple valve position parameters of the regulating valve will be calculated, and each calculated valve position parameter of the regulating valve corresponds to a time point. Generate a valve position response curve of the regulating valve according to each valve position parameter of the regulating valve and the corresponding time point. The abscissa of the two-dimensional coordinate system where the valve position response curve of the regulating valve is located is time, and the ordinate is the valve position of the regulating valve. The valve position response curve of the regulating valve reflects the change trend of the valve position of the regulating valve during the dynamic regulation simulation of the non-adjustable extraction steam turbine. For example, during the dynamic regulation simulation, the valve position response curve of the regulating valve can be displayed in the simulation device; while in the actual non-adjustable extraction steam turbine, a valve position oscilloscope can be set at the regulating valve to display the valve position response curve of the regulating valve in the valve position oscilloscope.

[0101] On the basis of Figure 1 , the embodiment of the present application also provides another dynamic regulation simulation method for a non-adjustable extraction steam turbine. Figure 4 It is a schematic flowchart of another dynamic regulation simulation method for a non-adjustable extraction steam turbine provided by the present application. As Figure 4 described, the method further includes:

[0102] S401. Recalculate the pressure behind the regulating valve according to the target speed of the non-adjustable extraction steam turbine.

[0103] After calculating the target speed of the non-adjustable extraction steam turbine, use the calculated target speed of the non-adjustable extraction steam turbine as a new round of initial input value, input it into the dynamic regulation simulation mathematical model of the non-adjustable extraction steam turbine, recalculate the pressure behind the regulating valve, and start a new round of dynamic regulation simulation.

[0104] S402. Recalculate the rotational speed of the non - adjustable extraction steam turbine through a preset rotor equation based on the recalculated pressure behind the regulating valve and the load power parameter of the non - adjustable extraction steam turbine until the deviation between the recalculated rotational speed and the given rotational speed of the non - adjustable extraction steam turbine is within a preset deviation range.

[0105] Substitute the recalculated pressure behind the regulating valve and the recalculated load power change parameter into the preset rotor equation, and a new round of rotational speed of the non - adjustable extraction steam turbine can be recalculated. At the same time, compare the recalculated rotational speed with the given rotational speed of the non - adjustable extraction steam turbine. If the deviation between the recalculated rotational speed and the given rotational speed of the non - adjustable extraction steam turbine exceeds the preset deviation range, continue to repeat the steps in S401 until the deviation between the recalculated rotational speed and the given rotational speed of the non - adjustable extraction steam turbine is within the preset deviation range, and then stop the simulation calculation. That is, the rotational speed of the non - adjustable extraction steam turbine in the simulation has been adjusted to the normal rotational speed range. Among them, the given rotational speed of the non - adjustable extraction steam turbine and the preset deviation range can be set by the staff. The given rotational speed of the non - adjustable extraction steam turbine is the rotational speed when the non - adjustable extraction steam turbine operates normally, and the preset deviation range is the rotational speed deviation range when the non - adjustable extraction steam turbine operates normally.

[0106] In summary, in this embodiment, by recalculating the pressure behind the regulating valve according to the target rotational speed of the non - adjustable extraction steam turbine, and recalculating the rotational speed of the non - adjustable extraction steam turbine using the preset rotor equation based on the recalculated pressure behind the regulating valve until the deviation between the recalculated rotational speed and the given rotational speed of the non - adjustable extraction steam turbine is within the preset deviation range. Thus, by setting the preset deviation range and performing multiple rounds of simulation calculations, the simulation results can be accurately obtained.

[0107] Figure 5 It is a schematic flowchart of a method for recalculating the pressure behind the regulating valve provided by an embodiment of the present application. As Figure 5 shown, in S402, recalculating the pressure behind the regulating valve according to the target rotational speed of the non - adjustable extraction steam turbine includes;

[0108] S501. Update the target rotational speed using the preset speed regulation rate module of the non - adjustable extraction steam turbine.

[0109] The speed regulation rate refers to the ratio of the rotational speed change amount of the steam turbine from full load to no load to the rated rotational speed. The preset speed regulation rate is the speed regulation rate of the simulated non - adjustable extraction steam turbine, and a reasonable speed regulation rate can also be set by the staff. For example, the speed regulation rate in general cases is 3 - 6%.

[0110] The target speed is input into the preset speed inequality module of the non-adjustable extraction steam turbine to update the target speed. Comprehensive consideration of the speed inequality makes the simulation calculation more accurate. It should be noted here that when the initial speed of the non-adjustable extraction steam turbine is obtained, the preset speed inequality module of the non-adjustable extraction steam turbine can also be used to update the initial speed.

[0111] S502: Calculate the speed deviation according to the updated target speed and the given speed.

[0112] The speed deviation can be obtained according to the updated target speed and the given speed. Specifically, the speed deviation is calculated by subtracting the updated target speed from the given speed. If the speed deviation exceeds the preset deviation range, the simulation calculation is continued; if the speed deviation is within the preset deviation range, the simulation calculation is stopped.

[0113] S503: Recalculate the downstream pressure of the regulating valve according to the rotation speed deviation.

[0114] The downstream pressure of the regulating valve is recalculated according to the speed deviation, that is, the downstream pressure of the regulating valve (i.e., the rate of change of the downstream pressure of the regulating valve) is recalculated according to the dimensionless speed deviation, so as to facilitate subsequent simulation calculations.

[0115] In summary, in this embodiment, the preset speed inequality module of the non-adjustable extraction steam turbine is adopted to update the target speed; the speed deviation is calculated according to the updated target speed and the given speed; and the valve outlet pressure of the regulating valve is recalculated according to the speed deviation. Thus, by considering the preset speed inequality and the speed deviation, the simulation calculation results are more accurate.

[0116] Continue to refer to Figure 5 , the method may further include:

[0117] A speed rise curve of a non-adjustable steam extraction steam turbine is generated according to the speed calculated within a preset time period.

[0118] Multiple speeds will be calculated within a preset time period, and each calculated speed corresponds to a time point. A speed rise curve is generated based on each speed and the corresponding time point. The horizontal coordinate of the two-dimensional coordinate system where the speed rise curve is located is time, and the vertical coordinate is the speed change rate. The speed rise curve reflects the speed change trend during the dynamic adjustment simulation of the non-adjustable steam extraction steam turbine. For example, during the dynamic adjustment simulation process, the speed rise curve can be displayed in the simulation device; and in the actual non-adjustable steam extraction steam turbine, a speed oscilloscope can be set to display the speed rise curve in the speed oscilloscope.

[0119] Continue to refer to Figure 5 , the method may further include:

[0120] Generate a load response curve for a non - adjustable extraction steam turbine based on the load power parameters corresponding to the calculated rotational speeds within a preset time period.

[0121] During the preset time period, multiple rotational speeds are calculated, and each rotational speed has a corresponding load power parameter. Each calculated rotational speed corresponds to a time point. Generate a load response curve based on the load power parameter corresponding to each rotational speed and the corresponding time point. The abscissa of the two - dimensional coordinate system where the load response curve is located is time, and the ordinate is the load power parameter. The load response curve reflects the change trend of the rotational speed during the dynamic regulation simulation process of the non - adjustable extraction steam turbine. For example, during the dynamic regulation simulation process, the load response curve can be displayed in the simulation device; while in the actual non - adjustable extraction steam turbine, a load oscilloscope can be set to display the load response curve in the rotational speed oscilloscope.

[0122] This application also provides a dynamic regulation simulation model for a non - adjustable extraction steam turbine. Figure 6 It is a schematic structural diagram of a dynamic regulation simulation model for a non - adjustable extraction steam turbine provided by an embodiment of this application.

[0123] As Figure 6 shown, the model includes: an electro - hydraulic converter module 101, a pilot valve - oil motor module 102, a regulating valve position module 103, a volume module 104, a rotor equation module 200, a preset proportional - integral - derivative control module 300, a rotational speed output module 400, a load module 500, a given rotational speed module 600, and a speed regulation rate module 700.

[0124] A preset electro - hydraulic conversion equation is set in the electro - hydraulic converter module 101; a preset pilot valve - oil motor equation is set in the pilot valve - oil motor module 102; the regulating valve position module 103 can display the valve position of the regulating valve and the valve position response curve of the regulating valve; a preset volume equation is set in the volume module 104; a preset rotor equation is set in the rotor equation module 200; the rotational speed output module 400 can display the target rotational speed of the calculated non - adjustable extraction steam turbine; the given rotational speed module 600 can input a given rotational speed; a preset proportional - integral - derivative control equation is set in the preset proportional - integral - derivative control module 300; the load module 500 can output load parameters; the speed regulation rate module 700 is used to update the target rotational speed according to the speed regulation rate.

[0125] Based on this model, the steps in Figures 1 - 5 any of the dynamic regulation simulation methods for a non - adjustable extraction steam turbine can be completed.

[0126] The following describes a dynamic regulation simulation device, equipment, and storage medium provided by the present application for execution. For the specific implementation process and technical effects, refer to the above, and the following will not be elaborated.

[0127] Figure 7 It is a schematic diagram of a dynamic regulation simulation device for a non-adjustable extraction steam turbine provided by an embodiment of the present application. The non-adjustable extraction steam turbine is equipped with a regulating valve, a cylinder steam chamber corresponding to the regulating valve, and a rotor; as Figure 7 shown, the simulation device may include:

[0128] A first calculation module 701, configured to calculate the pressure behind the regulating valve according to the initial speed of the non-adjustable extraction steam turbine.

[0129] A second calculation module 702, configured to calculate the target speed of the non-adjustable extraction steam turbine through a preset rotor equation of the non-adjustable extraction steam turbine according to the pressure behind the regulating valve and the load power parameter of the non-adjustable extraction steam turbine.

[0130] Optionally, the first calculation module 701 is specifically configured to calculate the control current of the regulating valve according to the initial speed of the non-adjustable extraction steam turbine by using a preset proportional-integral-derivative controller of the non-adjustable extraction steam turbine; and calculate the pressure behind the regulating valve according to the control current of the regulating valve by using a control model corresponding to the regulating valve.

[0131] Optionally, the first calculation module 701 is further specifically configured to calculate the secondary oil pressure parameter according to the control current of the regulating valve by using an electro-hydraulic converter module; calculate the valve position parameter of the regulating valve according to the secondary oil pressure parameter by using a pilot valve and servomotor module; and calculate the pressure behind the regulating valve according to the adjusted valve position parameter by using a volume module.

[0132] Optionally, the first calculation module 701 is further specifically configured to generate a valve position response curve of the regulating valve according to the valve position parameter of the regulating valve calculated within a preset time period.

[0133] Optionally, the first calculation module 701 is further configured to recalculate the pressure behind the regulating valve according to the target speed of the non-adjustable extraction steam turbine.

[0134] Optionally, the second calculation module 702 is further configured to recalculate the speed of the non-adjustable extraction steam turbine through a preset rotor equation according to the recalculated pressure behind the regulating valve and the load power parameter of the non-adjustable extraction steam turbine until the deviation between the recalculated speed and the given speed of the non-adjustable extraction steam turbine is within a preset deviation range.

[0135] Optionally, the first calculation module 701 is also specifically used to update the target speed using a preset speed inequality module of a non-adjustable extraction steam turbine; calculate the speed deviation based on the updated target speed and the given speed; and recalculate the valve post pressure of the regulating valve based on the speed deviation.

[0136] Optionally, the second calculation module 702 is further configured to generate a speed rise curve of the non-adjustable extraction steam turbine according to the target speed calculated within a preset time period.

[0137] Optionally, the second calculation module 702 is further configured to generate a load response curve of the non-adjustable extraction steam turbine according to a load power parameter corresponding to the target speed calculated within a preset time period.

[0138] The above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASIC), or one or more digital singnal processors (DSP), or one or more field programmable gate arrays (FPGA). For another example, when a module is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0139] Figure 8 A schematic diagram of a simulation device provided in an embodiment of the present application, wherein the simulation device may be a device with computing and processing functions.

[0140] The simulation device includes: a processor 801 and a storage medium 802. The processor 801 and the storage medium 802 are connected via a bus.

[0141] The storage medium 802 is used to store programs, and the processor 801 calls the programs stored in the storage medium 802 to execute the above method embodiment. The specific implementation method and technical effect are similar and will not be repeated here.

[0142] Optionally, the present invention also provides a program product, such as a computer-readable storage medium, comprising a program, which is used to execute the above method embodiment when executed by a processor.

[0143] In several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0144] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0145] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of a combination of hardware and software functional units.

[0146] The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional units stored in a storage medium include several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute some steps of the methods described in each embodiment of the present invention. And the aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (English: Read-Only Memory, abbreviated as: ROM), random access memories (English: Random Access Memory, abbreviated as: RAM), magnetic disks, or optical discs and other various media that can store program codes.

Claims

1. A dynamic regulation simulation method for a non-adjustable extraction steam turbine, characterized in that The non-adjustable steam extraction type steam turbine has a regulating valve, a steam chamber corresponding to the regulating valve, and a rotor; the method comprises: Calculating the valve downstream pressure of the regulating valve according to the initial speed of the non-adjustable steam extraction type steam turbine; Calculating a target speed of the non-adjustable extraction steam turbine according to a valve rear pressure of the regulating valve and a load power parameter of the non-adjustable extraction steam turbine by using a preset rotor equation of the non-adjustable extraction steam turbine; The preset rotor equation of the non-adjustable extraction steam turbine is as follows: Among them, Te is the rotor time constant; s1 is the input quantity of the preset rotor equation; f1(s) is the output quantity of the preset rotor equation.

2. The method according to claim 1, wherein The step of calculating the valve rear pressure of the regulating valve according to the initial speed of the non-adjustable steam extraction type steam turbine comprises: Calculating the control current of the regulating valve using a preset proportional-integral-differential controller of the non-adjustable steam extraction turbine according to the initial speed of the non-adjustable steam extraction turbine; According to the control current of the regulating valve, a control model corresponding to the regulating valve is adopted to calculate the valve downstream pressure of the regulating valve.

3. The method according to claim 2, wherein The control model corresponding to the regulating valve includes: an electro-hydraulic converter module, a staggered throttle oil motor module, and a volume module; the post-valve pressure of the regulating valve is calculated according to the control current of the regulating valve and the control model corresponding to the regulating valve, including: According to the control current of the regulating valve, the secondary oil pressure parameter is calculated by the electro-hydraulic converter module; According to the secondary oil pressure parameter, the valve position parameter of the regulating valve is calculated by using the throttle oil motor module; According to the regulated valve position parameter, the post-valve pressure of the regulating valve is calculated by using the volume module.

4. The method according to claim 3, wherein The method further comprises: A valve position response curve of the regulating valve is generated according to the valve position parameters of the regulating valve calculated within a preset time period.

5. The method according to claim 1, characterized in that, The method further comprises: recalculating the downstream pressure of the regulating valve according to the target speed of the non-adjustable extraction steam turbine; According to the recalculated post-valve pressure of the regulating valve and the load power parameter of the non-adjustable extraction steam turbine, the speed of the non-adjustable extraction steam turbine is recalculated through the preset rotor equation until the deviation between the recalculated speed and the given speed of the non-adjustable extraction steam turbine is within a preset deviation range.

6. The method according to claim 5, characterized in that, The recalculating the downstream pressure of the regulating valve according to the target speed of the non-adjustable extraction steam turbine comprises: Adopting the preset speed droop module of the non-adjustable extraction steam turbine to update the target speed; Calculating a speed deviation according to the updated target speed and the given speed; The downstream pressure of the regulating valve is recalculated according to the rotation speed deviation.

7. The method according to claim 5, characterized in that, The method further comprises: A speed rise curve of the non-adjustable steam extraction type steam turbine is generated according to the speed calculated within a preset time period.

8. The method according to claim 5, characterized in that, The method further comprises: A load response curve of the non-adjustable extraction steam turbine is generated according to the load power parameter corresponding to the rotational speed calculated within a preset time period.

9. A dynamic regulation simulation device for a non-adjustable extraction steam turbine, characterized in that, The non-adjustable extraction steam turbine is provided with a control valve, a steam chamber corresponding to the control valve, and a rotor; the device includes: A first calculation module, configured to calculate the pressure behind the control valve according to the initial speed of the non-adjustable extraction steam turbine; A second calculation module, configured to calculate the target speed of the non-adjustable extraction steam turbine through a preset rotor equation of the non-adjustable extraction steam turbine according to the pressure behind the control valve and the load power parameter of the non-adjustable extraction steam turbine; The preset rotor equation of the non-adjustable extraction steam turbine is shown as the following formula: where Te is the rotor time constant; s1 is the input of the preset rotor equation; f1(s) is the output of the preset rotor equation.

10. A simulation device, characterized in that, Including: A processor and a storage medium, the processor and the storage medium are communicatively connected through a bus, the storage medium stores program instructions executable by the processor, and the processor calls the program stored in the storage medium to execute the steps of the dynamic regulation simulation method of the non-adjustable extraction steam turbine according to any one of claims 1 to 8.

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