A dynamic regulation simulation method for adjustable extraction steam turbine

Abstract

The present application provides a dynamic regulation simulation method for an adjustable extraction steam turbine, which relates to the field of steam turbine control technology. The method calculates the high-pressure valve rear pressure of the high-pressure steam chamber and the low-pressure valve rear pressure of the low-pressure steam chamber respectively according to the initial speed of the adjustable extraction steam turbine; and calculates the target speed of the adjustable extraction steam turbine through the preset rotor equation of the adjustable extraction steam turbine according to the high-pressure valve rear pressure and the low-pressure valve rear pressure. Thus, it avoids the use of an actual 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 adjustable extraction steam turbine.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine control, and in particular to a dynamic regulation simulation method for an adjustable extraction steam turbine. Background Art

[0002] The static characteristics of the regulating system of the adjustable extraction steam turbine are the basis of the unit design, but the static characteristics can only reflect the one-to-one correspondence between each component and each signal in the system, and can only reflect the static results between each signal, and cannot accurately describe the trend changes of the system during operation, and the changing trends affected by other external signals during operation. Understanding the dynamic characteristics of the regulating system helps to better analyze the cause of the failure of the regulating system, find the crux of the problem, and provide improvement measures based on the crux, which helps to better improve the design plan and make the system more stable.

[0003] At the same time, during the load shedding process of the unit, since the residual steam in the extraction pipe will directly enter the low-pressure steam chamber to perform work, the specifications of the extraction pipe and the layout of the extraction quick-closing valve will directly affect the safety of the unit and the speed rise rate of the unit during load shedding. Through the analysis of dynamic characteristics, the most optimized extraction pipe specifications and extraction quick-closing valve layout can be obtained to improve the reliability of unit operation.

[0004] The most intuitive way to obtain the dynamic characteristics of the adjustable extraction steam turbine regulating system is to conduct a dynamic characteristics test, but such a test requires a lot of financial and human resources. Therefore, an efficient method for obtaining the dynamic characteristics of the adjustable extraction steam turbine regulating system is urgently needed. Summary of the invention

[0005] The purpose of the present invention is to provide a dynamic regulation simulation method for an adjustable extraction steam turbine in view of the above-mentioned deficiencies in the prior art, so as to solve the problems in the prior art that a large amount of financial and human resources are required to obtain the dynamic characteristics of the adjustable extraction steam turbine regulation system.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In a first aspect, an embodiment of the present application provides a dynamic regulation simulation method for an adjustable extraction steam turbine, wherein the adjustable extraction steam turbine has a main regulating valve, a high-pressure steam chamber corresponding to the main regulating valve, an extraction relief valve, a low-pressure steam chamber corresponding to the extraction relief valve, and a rotor; the method comprises:

[0008] According to the initial rotation speed of the adjustable extraction steam turbine, respectively calculating the pressure after the high-pressure valve of the high-pressure steam chamber and the pressure after the low-pressure valve of the low-pressure steam chamber;

[0009] According to the high-pressure valve rear pressure and the low-pressure valve rear pressure, the target speed of the adjustable extraction steam turbine is calculated by using a preset rotor equation of the adjustable extraction steam turbine.

[0010] Optionally, the calculating, according to the initial rotation speed of the adjustable extraction steam turbine, respectively the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber, comprises:

[0011] According to the initial speed of the adjustable extraction steam turbine, a preset proportional integral differential controller of the adjustable extraction steam turbine is used to calculate the control current of the main regulating valve and the control current of the extraction relief valve;

[0012] According to the control current of the main regulating valve, the pressure after the high-pressure valve is calculated by using the control model corresponding to the main regulating valve;

[0013] The low-pressure valve rear pressure is calculated according to the control current of the steam extraction relief valve and using a control model corresponding to the steam extraction relief valve.

[0014] Optionally, the control model corresponding to the main regulating valve includes: a high-pressure electro-hydraulic converter module, a high-pressure throttle oil motor module, and a high-pressure volume module; the calculation of the high-pressure valve rear pressure according to the control current of the main regulating valve and the control model corresponding to the main regulating valve includes:

[0015] According to the control current of the main regulating valve, the secondary oil pressure parameter of the main regulating valve is calculated by using the high-pressure electro-hydraulic converter module;

[0016] According to the secondary oil pressure parameter of the main regulating valve, the valve position parameter of the main regulating valve is calculated by using the high-pressure staggered throttle oil motor module;

[0017] According to the valve position parameter of the main regulating valve, the valve rear pressure of the main regulating valve is calculated by using the high pressure volume module;

[0018] The high-pressure valve rear pressure is calculated according to the valve rear pressure of the main regulating valve and the preset power coefficient of the high-pressure steam chamber.

[0019] Optionally, the method further comprises:

[0020] A valve position response curve of the main regulating valve is generated according to the valve position parameters of the main regulating valve calculated within a preset time period.

[0021] Optionally, the control model corresponding to the steam extraction relief valve includes: a low-pressure electro-hydraulic converter module, a low-pressure throttle oil motor module, and a low-pressure volume module; the low-pressure valve rear pressure is calculated according to the control current of the steam extraction relief valve and the control model corresponding to the steam extraction relief valve, including:

[0022] According to the control current of the extraction steam relief valve, the secondary oil pressure parameter of the extraction steam relief valve is calculated by using the low-voltage electro-hydraulic converter module;

[0023] According to the secondary oil pressure parameter of the extraction steam relief valve, the valve position parameter of the extraction steam relief valve is calculated by using the low-pressure throttle oil motor module;

[0024] According to the valve position parameter of the steam extraction relief valve, the valve rear pressure of the steam extraction relief valve is calculated by using the low-pressure volume module;

[0025] The low-pressure valve rear pressure is calculated according to the valve rear pressure of the steam extraction relief valve and the preset power coefficient of the low-pressure steam chamber.

[0026] Optionally, the method further comprises:

[0027] A valve position response curve of the steam extraction relief valve is generated according to the valve position parameters of the steam extraction relief valve calculated within a preset time period.

[0028] Optionally, the calculating the target speed of the adjustable extraction steam turbine according to the high-pressure valve rear pressure and the low-pressure valve rear pressure and using a preset rotor equation of the adjustable extraction steam turbine comprises:

[0029] Obtaining preset load parameters of the adjustable extraction steam turbine;

[0030] According to the high-pressure valve rear pressure, the low-pressure valve rear pressure and the preset load parameter, the target speed of the adjustable extraction steam turbine is calculated using the preset rotor equation of the adjustable extraction steam turbine.

[0031] Optionally, the method further comprises:

[0032] recalculating the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber respectively according to the target speed of the adjustable extraction steam turbine;

[0033] According to the recalculated high-pressure valve rear pressure and low-pressure valve rear pressure, the preset rotor equation is used to recalculate the speed of the adjustable extraction steam turbine until the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine is within a preset deviation range.

[0034] Optionally, the recalculating the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber respectively according to the target speed of the adjustable extraction steam turbine comprises:

[0035] Adopting the preset speed droop module of the adjustable extraction steam turbine to update the target speed;

[0036] Calculating a speed deviation according to the updated target speed and the given speed;

[0037] According to the rotation speed deviation, the high-pressure valve downstream pressure of the high-pressure steam chamber and the low-pressure valve downstream pressure of the low-pressure steam chamber are recalculated respectively.

[0038] Optionally, the method further comprises:

[0039] A speed rise curve of the adjustable extraction steam turbine is generated according to the speed calculated within a preset time period.

[0040] Compared with the prior art, this application has the following beneficial effects:

[0041] The present application provides a dynamic regulation simulation method for an adjustable extraction steam turbine. The method calculates the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber according to the initial speed of the adjustable extraction steam turbine; and calculates the target speed of the adjustable extraction steam turbine using the preset rotor equation of the adjustable extraction steam turbine according to the high pressure valve rear pressure and the low pressure valve rear pressure. Thus, it avoids the use of a real 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 adjustable extraction steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic flow chart of a dynamic adjustment simulation method for an adjustable extraction steam turbine provided in an embodiment of the present application;

[0044] Figure 2 A flow chart of a method for calculating the pressure after a high-pressure valve and the pressure after a low-pressure valve respectively according to an initial rotation speed provided in an embodiment of the present application;

[0045] Figure 3 A schematic diagram of a flow chart for calculating the pressure after a high-pressure valve according to the control current of a main regulating valve provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of a flow chart for calculating the pressure after a low-pressure valve according to the control current of a steam extraction relief valve provided in an embodiment of the present application;

[0047] Figure 5 A schematic flow chart of a method for calculating a target speed of an adjustable extraction steam turbine provided in an embodiment of the present application;

[0048] Figure 6 A schematic flow chart of another dynamic regulation simulation method for an adjustable extraction steam turbine provided in the present application;

[0049] Figure 7 A flow chart of a method for recalculating the pressure after a high-pressure valve and the pressure after a low-pressure valve provided in an embodiment of the present application;

[0050] Figure 8 A structural schematic diagram of a dynamic adjustment simulation model of an adjustable extraction steam turbine provided in an embodiment of the present application;

[0051] Fig. 9 A schematic diagram of a dynamic adjustment simulation device for an adjustable extraction steam turbine provided in an embodiment of the present application;

[0052] Fig.10 A schematic diagram of a simulation device provided in an embodiment of the present application.

[0053] Icons: 101-high-pressure electro-hydraulic converter module, 102-high-pressure staggered throttle oil motor module, 103-main regulating valve position module, 104-high-pressure volume module, 105-preset power coefficient module of high-pressure steam chamber, 201-low-pressure electro-hydraulic converter module, 202-low-pressure staggered throttle oil motor module, 203-extraction overflow valve position module, 204-low-pressure volume module, 205-extraction link coefficient module, 206-preset power coefficient module of low-pressure steam chamber, 300-rotor equation module, 301-speed output module, 302-given speed module, 400-preset proportional integral differential control module, 500-load module, 600-speed unequal rate module, 901-first calculation module, 902-second calculation module, 1001-processor, 1002-storage medium. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0056] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0057] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0058] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0059] In order to obtain the dynamic adjustment characteristics of an adjustable extraction steam turbine, the present application provides a dynamic adjustment simulation method for an adjustable extraction steam turbine. The adjustable extraction steam turbine is simulated by the dynamic adjustment simulation method, thereby avoiding the use of a real adjustable extraction steam turbine for dynamic characteristic testing and saving manpower and material resources.

[0060] Before explaining the dynamic regulation simulation method of the adjustable steam extraction steam turbine, the adjustable steam extraction steam turbine is introduced first. The adjustable steam extraction steam turbine has a main regulating valve (also called a high-pressure valve), a high-pressure steam chamber corresponding to the main regulating valve, an extraction relief valve (also called a low-pressure valve), a low-pressure steam chamber corresponding to the extraction relief valve, and a rotor. The adjustable steam extraction steam turbine also includes a speed governor, a high-pressure electro-hydraulic converter, a high-pressure throttle oil motor, a low-pressure electro-hydraulic converter, and a low-pressure throttle oil motor. The speed governor generates a control current (including: the control current of the main regulating valve and the control current of the extraction relief valve) according to the speed signal, and transmits the control current of the main regulating valve to the high-pressure electro-hydraulic converter; the high-pressure electro-hydraulic converter generates a hydraulic signal according to the control current, and transmits the hydraulic signal to the throttle in the high-pressure throttle oil motor. The moving position of the throttle slide valve determines the output direction of the oil motor, thereby driving the valve position of the main regulating valve to change; the valve position change of the main regulating valve will cause the steam pressure in the steam chamber corresponding to the main regulating valve to change. At the same time, the governor transmits the control current of the extraction steam relief valve to the low-pressure electro-hydraulic converter; the low-pressure electro-hydraulic converter generates a hydraulic signal according to the control current, and transmits the hydraulic signal to the throttle valve in the low-pressure throttle oil motor. The movement position of the throttle valve slide valve determines the output direction of the oil motor, thereby driving the valve position change of the extraction steam relief valve; the change of the valve position of the extraction steam relief valve will cause the steam pressure in the steam chamber corresponding to the extraction steam relief valve to change. The steam in the high-pressure steam chamber corresponding to the main regulating valve and the steam in the low-pressure steam chamber corresponding to the extraction steam relief valve jointly drive the rotor to rotate, and then change the speed of the rotor according to the change of steam pressure in the two steam chambers.

[0061] The present application analyzes the internal mechanism and basic physical laws of the adjustable extraction steam turbine regulation system, adopts appropriate and reasonable simplifications and assumptions, establishes mathematical models of each module in the adjustable extraction steam turbine regulation system, and obtains a dynamic regulation simulation method for the adjustable extraction steam turbine. For example, the adjustable extraction steam turbine includes: a single adjustable extraction back pressure steam turbine, a single adjustable extraction condensing steam turbine, and various non-adjustable and single adjustable extraction combined steam turbines.

[0062] The following is an explanation of a dynamic adjustment simulation method for an adjustable extraction steam turbine provided in an embodiment of the present application through a specific example. Figure 1 The present invention provides a flow chart of a dynamic adjustment simulation method for an adjustable extraction steam turbine. The execution subject of the method can be a desktop computer, a laptop computer, etc. with computing and processing functions, and is not limited here. Figure 1 As shown, the method includes:

[0063] S101. Calculate the pressure behind the high-pressure valve of the high-pressure steam chamber and the pressure behind the low-pressure valve of the low-pressure steam chamber according to the initial rotation speed of the adjustable extraction steam turbine.

[0064] After establishing the dynamic regulation simulation mathematical model of the adjustable extraction steam turbine, the dynamic regulation simulation mathematical model requires an initial input value to start the dynamic regulation simulation of the adjustable extraction steam turbine. Therefore, the initial speed of the adjustable extraction steam turbine can be set to start the dynamic regulation simulation mathematical model of the adjustable extraction steam turbine. The dynamic regulation simulation mathematical model of the adjustable extraction steam turbine simulates the internal mechanism process and basic physical laws of the adjustable extraction steam turbine. By substituting the initial speed into the dynamic regulation simulation mathematical model, the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber corresponding to the initial speed control adjustment in the adjustable extraction steam turbine can be calculated.

[0065] In actual calculation, first calculate the deviation between the initial speed and the given speed according to the initial speed of the adjustable extraction steam turbine and the given speed of the adjustable extraction steam turbine. If the deviation exceeds the preset deviation range, calculate the high pressure valve back pressure of the high pressure steam chamber and the low pressure valve back pressure of the low pressure steam chamber according to the deviation; if the deviation is within the preset deviation range, no calculation is performed, that is, the initial speed is within the normal range. The given speed and the preset deviation range of the adjustable extraction steam turbine can be set by the staff according to the actual situation of the adjustable extraction steam turbine. The given speed of the adjustable extraction steam turbine is the speed of the adjustable extraction steam turbine when it is working normally, and the preset deviation range is the speed deviation range of the adjustable extraction steam turbine when it is working normally.

[0066] For example, the initial speed may be the speed value when the adjustable extraction steam turbine is subjected to load shedding. When the adjustable extraction steam turbine is operating normally, the speed value when the adjustable extraction steam turbine is subjected to load shedding may be obtained, which may be used to dynamically adjust the initial input value of the simulation mathematical model. Load shedding refers to a reduction in the power load of the end user (for example, a large power-consuming equipment failure or a large area line failure power outage, which reduces the power consumption of the user), and the power generation of the steam turbine exceeds the amount delivered to the user. At this time, the steam turbine reduces the power generation to an execution action that is compatible with the actual load.

[0067] It should be noted that in the process of dynamic regulation simulation of the adjustable extraction steam turbine carried out in the present application, different types of parameter calculations are involved. To facilitate simulation calculations, the numerical values ​​used are dimensionless numbers. The dimensionless numbers are obtained by dimensionally converting the numerical values ​​of different types of parameters, and the dimensionless numbers are input into the dynamic regulation simulation mathematical model to obtain the corresponding dimensionless results. The corresponding numerical results are obtained by processing the dimensionless results. Therefore, before inputting the initial speed of the adjustable extraction steam turbine, the initial speed needs to be dimensionally converted, and the dimensionless high-pressure valve rear pressure and the dimensionless low-pressure valve rear pressure (i.e., the rate of change of the high-pressure valve rear pressure and the rate of change of the low-pressure valve rear pressure) are calculated respectively through the dimensionless initial speed. The specific dimensionless processing method is not limited, for example, the standardization method and the specific gravity method in the linear dimensionless method.

[0068] S102, calculating a target speed of the adjustable extraction steam turbine according to the high-pressure valve rear pressure and the low-pressure valve rear pressure by using a preset rotor equation of the adjustable extraction steam turbine.

[0069] The adjustable extraction steam turbine is equipped with a main regulating valve and an extraction relief valve. The speed of the adjustable extraction steam turbine can be adjusted by adjusting the main regulating valve and the extraction relief valve. The main regulating valve corresponds to the high-pressure cylinder, and the extraction relief valve corresponds to the low-pressure cylinder. Specifically, the main regulating valve controls the high-pressure cylinder, and the extraction relief valve controls the low-pressure cylinder to act on the adjustable extraction steam turbine to adjust the speed. Therefore, when calculating the target speed of the adjustable extraction steam turbine, it is necessary to comprehensively consider the pressure after the high-pressure valve and the pressure after the low-pressure valve.

[0070] The preset rotor equation of the adjustable extraction steam turbine is shown in the following formula (1):

[0071]

[0072] Among them, Te is the rotor time constant, which can be obtained in advance by using parameters such as 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 transformation, and the corresponding preset rotor equation is the Laplace equation; f1(s) is the output of the preset rotor equation.

[0073] Substituting the calculated dimensionless high-pressure valve back pressure and dimensionless low-pressure valve back pressure into the preset rotor equation of the adjustable extraction steam turbine, the dimensionless target speed can be obtained, that is, the rate of change compared to the initial speed. Then, the target speed of the adjustable extraction steam turbine is obtained according to the initial speed and the dimensionless target speed.

[0074] By establishing a dynamic regulation simulation method for an adjustable extraction steam turbine, instead of the original method of obtaining the dynamic characteristics of the steam turbine through the operation of an example steam turbine, manpower and material resources are saved, the test cost of the example unit is reduced, and convenience is brought to the subsequent development of the steam turbine regulation system and fault handling.

[0075] In summary, the embodiment of the present application provides a dynamic adjustment simulation method for an adjustable extraction steam turbine. According to the initial speed of the adjustable extraction steam turbine, the high-pressure valve rear pressure of the high-pressure steam chamber and the low-pressure valve rear pressure of the low-pressure steam chamber are calculated respectively; according to the high-pressure valve rear pressure and the low-pressure valve rear pressure, the preset rotor equation of the adjustable extraction steam turbine is used to calculate the target speed of the adjustable extraction steam turbine. Thus, it is avoided to use a real adjustable extraction steam turbine for dynamic characteristic testing, saving manpower and material resources, reducing the test cost of the example unit, and can also efficiently obtain the dynamic characteristics of the adjustable extraction steam turbine.

[0076] Figure 2 A flow chart of a method for calculating the pressure after the high-pressure valve and the pressure after the low-pressure valve according to the initial speed provided in an embodiment of the present application. Figure 2 As shown, in S101, the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber are calculated according to the initial speed of the adjustable extraction steam turbine, including:

[0077] S201. According to the initial rotation speed of the adjustable extraction steam turbine, a preset proportional-integral-differential controller of the adjustable extraction steam turbine is used to calculate the control current of the main regulating valve and the control current of the extraction relief valve.

[0078] The deviation between the initial speed and the given speed is calculated based on the initial speed of the adjustable extraction steam turbine and the given speed of the adjustable extraction steam turbine. The deviation is substituted into the preset proportional integral differential control equation of the adjustable extraction steam turbine to calculate the proportional integral differential control quantity corresponding to the deviation. The comparative deviation between the proportional integral differential control quantity and the preset load parameter is calculated based on the proportional integral differential control quantity and the preset load parameter, and the comparative deviation is multiplied by the coupling coefficient of the main regulating valve to obtain the control current of the main regulating valve; the comparative deviation is multiplied by the coupling coefficient of the extraction overflow valve to obtain the control current of the extraction overflow valve. For example, the preset load parameter is the load power value that needs to be thrown off for load shedding.

[0079] Specifically, the preset proportional integral differential control equation is shown in the following formula (2):

[0080]

[0081] Among them, P is the proportional coefficient of the preset proportional integral differential control equation, I is the integral coefficient of the preset proportional integral differential control equation, and D is the differential coefficient of the preset proportional integral differential control equation, which can be preset according to the internal mechanism process and basic physical laws of the preset proportional integral differential controller. PID is the input quantity of the preset proportional integral differential control equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset proportional integral differential control equation is the Laplace equation; PID(s) is the output quantity of the preset proportional integral differential controller. For example, the preset proportional integral differential controller can be a governor in an adjustable extraction steam turbine.

[0082] The dimensionless initial speed is substituted into the preset proportional integral differential control equation of the adjustable extraction steam turbine to calculate the dimensionless control current of the main regulating valve and the dimensionless control current of the extraction steam overflow valve, that is, the rate of change of the control current of the main regulating valve and the rate of change of the control current of the extraction steam overflow valve corresponding to the adjustment of the initial speed.

[0083] S202: Calculate the pressure after the high-pressure valve according to the control current of the main regulating valve and the control model corresponding to the main regulating valve.

[0084] The control current of the main regulating valve is used to control the control link of the main regulating valve. The control model corresponding to the main regulating valve reflects the internal mechanism and basic physical laws of the main regulating valve control link in the actual adjustable steam extraction steam turbine. Therefore, according to the control current of the main regulating valve, the pressure after the high-pressure valve can be calculated using the control model corresponding to the main regulating valve. The pressure after the high-pressure valve can represent the influence of the main regulating valve control link on the speed of the adjustable steam extraction steam turbine.

[0085] The dimensionless control current of the main regulating valve is substituted into the control model corresponding to the main regulating valve, and the dimensionless high-pressure valve downstream pressure is calculated, that is, the change rate of the high-pressure valve downstream pressure corresponding to the adjustment of the initial speed.

[0086] S203, calculating the pressure after the low-pressure valve according to the control current of the steam extraction relief valve and using the control model corresponding to the steam extraction relief valve.

[0087] The control current of the extraction relief valve is used to control the control link of the extraction relief valve. The control model corresponding to the extraction relief valve reflects the internal mechanism and basic physical laws of the extraction relief valve control link in the actual adjustable extraction steam turbine. Therefore, according to the control current of the extraction relief valve, the control model corresponding to the extraction relief valve can be used to calculate the low-pressure valve back pressure. The low-pressure valve back pressure can represent the influence of the extraction relief valve control link on the speed of the adjustable extraction steam turbine.

[0088] The dimensionless control current of the extraction steam relief valve is substituted into the control model corresponding to the extraction steam relief valve, and the dimensionless low-pressure valve downstream pressure is calculated, that is, the change rate of the low-pressure valve downstream pressure corresponding to the adjustment of the initial speed.

[0089] In summary, in this implementation, according to the initial speed of the adjustable extraction steam turbine, the preset proportional integral differential controller of the adjustable extraction steam turbine is used to calculate the control current of the main regulating valve and the control current of the extraction relief valve; according to the control current of the main regulating valve, the control model corresponding to the main regulating valve is used to calculate the pressure behind the high-pressure valve; according to the control current of the extraction relief valve, the control model corresponding to the extraction relief valve is used to calculate the pressure behind the low-pressure valve. Thus, through the simulation method, the pressure behind the high-pressure valve and the pressure behind the low-pressure valve are accurately calculated, which saves manpower and material resources and reduces the test cost of the example unit.

[0090] Figure 3 A schematic diagram of a flow chart for calculating the pressure after a high-pressure valve according to the control current of a main regulating valve provided in an embodiment of the present application. Figure 3 As shown, the control model corresponding to the main regulating valve includes: a high-pressure electro-hydraulic converter module, a high-pressure staggered throttle oil motor module, and a high-pressure volume module; in S202, according to the control current of the main regulating valve, the control model corresponding to the main regulating valve is used to calculate the pressure after the high-pressure valve, including:

[0091] S301. According to the control current of the main regulating valve, a secondary oil pressure parameter of the main regulating valve is calculated by using a high-pressure electro-hydraulic converter module.

[0092] The high-pressure electro-hydraulic converter module includes a preset high-pressure electro-hydraulic conversion equation. The high-pressure electro-hydraulic converter module reflects the internal mechanism and basic physical laws of the high-pressure electro-hydraulic converter in the actual adjustable steam extraction turbine. According to the control current of the main regulating valve, the secondary oil pressure parameter of the main regulating valve is calculated by the high-pressure electro-hydraulic converter module. That is, the secondary oil pressure parameter of the main regulating valve is obtained by controlling the high-pressure electro-hydraulic converter according to the control current of the main regulating valve.

[0093] Specifically, the preset high-pressure electro-hydraulic conversion equation is shown in the following formula (3):

[0094]

[0095] Among them, Ta1 is the time constant of the preset high-pressure electro-hydraulic conversion equation, which can be determined in advance according to the component configuration parameters in the regulation system; s2 is the input quantity of the preset high-pressure electro-hydraulic conversion equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset high-pressure electro-hydraulic conversion equation is the Laplace equation; f2(s) is the output quantity of the preset high-pressure electro-hydraulic conversion equation.

[0096] The dimensionless control current of the main regulating valve is substituted into the high-voltage electro-hydraulic converter module to calculate the dimensionless secondary oil pressure parameter of the main regulating valve, that is, the change rate of the secondary oil pressure parameter of the main regulating valve corresponding to the adjustment of the initial speed.

[0097] S302: According to the secondary oil pressure parameters of the main regulating valve, the valve position parameters of the main regulating valve are calculated by using the high pressure throttle oil motor module.

[0098] The high-pressure staggered throttle oil motor module includes a preset high-pressure staggered throttle oil motor equation. The high-pressure staggered throttle oil motor module reflects the internal mechanism process and basic physical laws of the high-pressure staggered throttle oil motor in the actual adjustable steam extraction steam turbine. According to the secondary oil pressure parameters of the main regulating valve, the high-pressure staggered throttle oil motor module is used to calculate the valve position parameters of the main regulating valve. That is, the high-pressure staggered throttle oil motor is controlled according to the secondary oil pressure parameters of the main regulating valve to obtain the valve position parameters of the main regulating valve.

[0099] Specifically, the preset high pressure staggered throttle oil motor equation is shown in the following formula (4):

[0100]

[0101] Among them, Tb1 is the time constant of the preset high-pressure misaligned throttle oil motor equation, which can be determined in advance according to the component configuration parameters in the adjustment system; s3 is the input quantity of the preset high-pressure misaligned throttle oil motor equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset high-pressure misaligned throttle oil motor equation is the Laplace equation; f3(s) is the output quantity of the preset high-pressure misaligned throttle oil motor equation.

[0102] The dimensionless secondary oil pressure parameter of the main regulating valve is substituted into the high-pressure throttle oil motor module to calculate the dimensionless valve position parameter of the main regulating valve, that is, the valve position parameter change rate of the main regulating valve corresponding to the initial speed adjustment. Furthermore, the value of the valve position parameter of the main regulating valve can be obtained according to the valve position parameter change rate of the main regulating valve.

[0103] S303: According to the valve position parameters of the main regulating valve, the pressure after the main regulating valve is calculated by using a high pressure volume module.

[0104] The high-pressure volume module includes a preset high-pressure volume equation, which reflects the internal mechanism and basic physical laws of the high-pressure volume module in the actual adjustable extraction steam turbine. According to the valve position parameters of the main regulating valve, the high-pressure volume module is used to calculate the valve back pressure of the main regulating valve. That is, the high-pressure volume module is controlled according to the valve position parameters of the main regulating valve to obtain the valve back pressure of the main regulating valve.

[0105] Specifically, the preset high pressure volume equation is shown in the following formula (5):

[0106]

[0107] Among them, Tc1 is the time constant of the preset high-pressure volumetric equation, which can be determined in advance according to the turbine structural volume and flow rate; s4 is the input quantity of the preset high-pressure volumetric equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset high-pressure volumetric equation is the Laplace equation; f4(s) is the output quantity of the preset high-pressure volumetric equation.

[0108] The dimensionless valve position parameters of the main regulating valve are substituted into the high-pressure volume module to calculate the dimensionless valve-rear pressure of the main regulating valve, that is, the valve-rear pressure change rate of the main regulating valve corresponding to the initial speed adjustment. Furthermore, the value of the valve-rear pressure of the main regulating valve can be obtained according to the valve-rear pressure change rate of the main regulating valve.

[0109] S304: Calculate the pressure behind the high-pressure valve according to the pressure behind the main regulating valve and the preset power coefficient of the high-pressure steam chamber.

[0110] The high-pressure valve back pressure is calculated by multiplying the valve back pressure of the main regulating valve by the preset power coefficient of the high-pressure steam chamber. The high-pressure steam chamber power coefficient is the ratio of the high-pressure steam chamber power to the total power of the adjustable steam extraction steam turbine. Comprehensively considering the ratio of the high-pressure steam chamber power to the total power of the adjustable steam extraction steam turbine makes the calculated high-pressure valve back pressure more accurate.

[0111] In summary, in this implementation, according to the control current of the main regulating valve, the secondary oil pressure parameters of the main regulating valve are calculated by the high-pressure electro-hydraulic converter module; according to the secondary oil pressure parameters of the main regulating valve, the valve position parameters of the main regulating valve are calculated by the high-pressure staggered throttle oil motor module; according to the valve position parameters of the main regulating valve, the valve back pressure of the main regulating valve is calculated by the high-pressure volume module; according to the valve back pressure of the main regulating valve and the preset power coefficient of the high-pressure steam chamber, the high-pressure valve back pressure is calculated. Thus, the high-pressure valve back pressure is accurately calculated through the simulation method, which saves manpower and material resources and reduces the test cost of the example unit.

[0112] Continue to refer to Figure 3 , the method may further include:

[0113] A valve position response curve of the main regulating valve is generated according to the valve position parameters of the main regulating valve calculated within a preset time period.

[0114] The valve position parameters of multiple main regulating valves will be calculated within a preset time period, and each calculated valve position parameter of the main regulating valve corresponds to a time point. The valve position response curve of the main regulating valve is generated according to the valve position parameter of each main regulating valve and the corresponding time point. The horizontal coordinate of the two-dimensional coordinate system where the valve position response curve of the main regulating valve is located is time, and the vertical coordinate is the valve position of the main regulating valve. The valve position response curve of the main regulating valve reflects the change trend of the valve position of the main regulating valve during the dynamic adjustment simulation of the adjustable steam extraction steam turbine. For example, during the dynamic adjustment simulation, the valve position response curve of the main regulating valve can be displayed in the simulation device; and in the actual adjustable steam extraction steam turbine, a valve position oscilloscope can be set at the main regulating valve, and the valve position response curve of the main regulating valve can be displayed in the valve position oscilloscope.

[0115] Figure 4 A schematic diagram of a flow chart for calculating the pressure after the low-pressure valve according to the control current of the steam extraction relief valve provided in the embodiment of the present application. Figure 4 As shown, the control model corresponding to the steam extraction relief valve includes: a low-pressure electro-hydraulic converter module, a low-pressure throttle oil motor module, and a low-pressure volume module; in S203, according to the control current of the steam extraction relief valve, the control model corresponding to the steam extraction relief valve is used to calculate the pressure after the low-pressure valve, including:

[0116] S401. According to the control current of the steam extraction relief valve, a low-voltage electro-hydraulic converter module is used to calculate the secondary oil pressure parameter of the steam extraction relief valve.

[0117] The low-pressure electro-hydraulic converter module includes a preset low-pressure electro-hydraulic conversion equation. The low-pressure electro-hydraulic converter module reflects the internal mechanism process and basic physical laws of the low-pressure electro-hydraulic converter in the actual adjustable extraction steam turbine. According to the control current of the extraction steam relief valve, the secondary oil pressure parameter of the extraction steam relief valve is calculated by the low-pressure electro-hydraulic converter module. That is, the secondary oil pressure parameter of the extraction steam relief valve is obtained by controlling the low-pressure electro-hydraulic converter according to the control current of the extraction steam relief valve.

[0118] Specifically, the preset low-pressure electro-hydraulic conversion equation is shown in the following formula (6):

[0119]

[0120] Among them, Ta2 is the time constant of the preset low-pressure electro-hydraulic conversion equation, which can be determined in advance according to the component configuration parameters in the regulation system; s5 is the input quantity of the preset low-pressure electro-hydraulic conversion equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset low-pressure electro-hydraulic conversion equation is the Laplace equation; f5(s) is the output quantity of the preset low-pressure electro-hydraulic conversion equation.

[0121] The dimensionless control current of the steam extraction relief valve is substituted into the low-voltage electro-hydraulic converter module to calculate the dimensionless secondary oil pressure parameter of the steam extraction relief valve, that is, the change rate of the secondary oil pressure parameter of the steam extraction relief valve corresponding to the adjustment of the initial speed.

[0122] S402. According to the secondary oil pressure parameter of the steam extraction relief valve, the valve position parameter of the steam extraction relief valve is calculated by using the low-pressure throttle oil motor module.

[0123] The low-pressure throttle oil motor module includes a preset low-pressure throttle oil motor equation, which reflects the internal mechanism and basic physical laws of the low-pressure throttle oil motor in the actual adjustable extraction steam turbine. According to the secondary oil pressure parameters of the extraction steam relief valve, the valve position parameters of the extraction steam relief valve are calculated by the low-pressure throttle oil motor module. That is, the valve position parameters of the extraction steam relief valve are obtained by controlling the low-pressure throttle oil motor according to the secondary oil pressure parameters of the extraction steam relief valve.

[0124] Specifically, the preset low-pressure throttle oil motor equation is shown in the following formula (7):

[0125]

[0126] Among them, Tb2 is the time constant of the preset low-pressure error throttle oil motor equation, which can be determined in advance according to the component configuration parameters in the regulation system; s6 is the input quantity of the preset low-pressure error throttle oil motor equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset low-pressure error throttle oil motor equation is the Laplace equation; f6(s) is the output quantity of the preset low-pressure error throttle oil motor equation.

[0127] The dimensionless secondary oil pressure parameter of the steam extraction relief valve is substituted into the low-pressure throttle oil motor module to calculate the dimensionless valve position parameter of the steam extraction relief valve, that is, the rate of change of the valve position parameter of the steam extraction relief valve corresponding to the adjustment of the initial speed. Furthermore, the value of the valve position parameter of the steam extraction relief valve can be obtained according to the rate of change of the valve position parameter of the steam extraction relief valve.

[0128] S403: According to the valve position parameter of the steam extraction relief valve, the valve rear pressure of the steam extraction relief valve is calculated by using a low-pressure volume module.

[0129] The low-pressure volume module includes a preset low-pressure volume equation, which reflects the internal mechanism and basic physical laws of the low-pressure volume module in the actual adjustable extraction steam turbine. According to the valve position parameters of the extraction steam relief valve, the valve back pressure of the extraction steam relief valve is calculated by the low-pressure volume module. That is, the valve back pressure of the extraction steam relief valve is obtained by controlling the low-pressure volume module according to the valve position parameters of the extraction steam relief valve.

[0130] Specifically, the preset low-pressure volume equation is shown in the following formula (8):

[0131]

[0132] Among them, Tc2 is the time constant of the preset low-pressure volume equation, which can be determined in advance according to the layout position and parameters of the steam extraction fast closing valve; s7 is the input quantity of the preset low-pressure volume equation. It should be noted that the input quantity here is the input quantity after Laplace transformation, and the corresponding preset low-pressure volume equation is the Laplace equation; f7(s) is the output quantity of the preset low-pressure volume equation.

[0133] The dimensionless valve position parameters of the steam extraction relief valve are substituted into the low-pressure volume module to calculate the dimensionless valve rear pressure of the steam extraction relief valve, that is, the valve rear pressure change rate of the steam extraction relief valve corresponding to the initial speed adjustment. Furthermore, the value of the valve rear pressure of the steam extraction relief valve can be obtained according to the valve rear pressure change rate of the steam extraction relief valve.

[0134] S404: Calculate the low-pressure valve rear pressure according to the valve rear pressure of the steam extraction relief valve and the preset power coefficient of the low-pressure steam chamber.

[0135] The pressure behind the low-pressure valve is calculated by multiplying the pressure behind the extraction relief valve with the preset power coefficient of the low-pressure steam chamber and the extraction link coefficient. The power coefficient of the low-pressure steam chamber is the ratio of the power of the low-pressure steam chamber to the total power of the adjustable extraction steam turbine; the extraction link coefficient is the influence factor of the extraction link on the speed. Comprehensively considering the ratio of the power of the low-pressure steam chamber to the total power of the adjustable extraction steam turbine and the influence factor of the extraction link on the speed, the calculated pressure behind the low-pressure valve is more accurate.

[0136] In summary, in this implementation, according to the control current of the steam extraction relief valve, the secondary oil pressure parameters of the steam extraction relief valve are calculated by using the low-pressure electro-hydraulic converter module; according to the secondary oil pressure parameters of the steam extraction relief valve, the valve position parameters of the steam extraction relief valve are calculated by using the low-pressure throttle oil motor module; according to the valve position parameters of the steam extraction relief valve, the valve back pressure of the steam extraction relief valve is calculated by using the low-pressure volume module; according to the valve back pressure of the steam extraction relief valve and the preset power coefficient of the low-pressure steam chamber, the low-pressure valve back pressure is calculated. Thus, the high-pressure valve back pressure is accurately calculated through the simulation method, which saves manpower and material resources and reduces the test cost of the example unit.

[0137] Continue to refer to Figure 4 , the method may further include:

[0138] A valve position response curve of the extraction steam relief valve is generated according to the valve position parameters of the extraction steam relief valve calculated within a preset time period.

[0139] The valve position parameters of multiple steam extraction relief valves are calculated within a preset time period, and each calculated valve position parameter of the steam extraction relief valve corresponds to a time point. The valve position response curve of the steam extraction relief valve is generated according to the valve position parameter of each steam extraction relief valve and the corresponding time point. The horizontal coordinate of the two-dimensional coordinate system where the valve position response curve of the steam extraction relief valve is located is time, and the vertical coordinate is the valve position of the steam extraction relief valve. The valve position response curve of the steam extraction relief valve reflects the change trend of the valve position of the steam extraction relief valve during the dynamic adjustment simulation of the adjustable steam extraction steam turbine. For example, during the dynamic adjustment simulation, the valve position response curve of the steam extraction relief valve can be displayed in the simulation device; and in the actual adjustable steam extraction steam turbine, a valve position oscilloscope can be set at the steam extraction relief valve, and the valve position response curve of the steam extraction relief valve can be displayed in the valve position oscilloscope.

[0140] Figure 5 The present invention provides a flow chart of a method for calculating the target speed of an adjustable extraction steam turbine. Figure 5 As shown, in S102, according to the high-pressure valve rear pressure and the low-pressure valve rear pressure, a preset rotor equation of the adjustable steam extraction turbine is used to calculate the target speed of the adjustable steam extraction turbine, including:

[0141] S501. Obtain preset load parameters of an adjustable extraction steam turbine.

[0142] For example, when the adjustable extraction steam turbine starts to shed load, the load parameter that the adjustable extraction steam turbine needs to shed is obtained. In the dynamic adjustment simulation process, a preset load parameter is obtained to represent the load parameter that needs to be shed when the adjustable extraction steam turbine starts to shed load. The preset load parameter represents the load power.

[0143] S502: Calculate the target speed of the adjustable extraction steam turbine according to the high-pressure valve rear pressure, the low-pressure valve rear pressure and the preset load parameters and the preset rotor equation of the adjustable extraction steam turbine.

[0144] On the basis of calculating the target speed of the adjustable extraction steam turbine according to the high-pressure valve rear pressure and the low-pressure valve rear pressure, the influencing factor of the preset load parameter can also be added into the calculation of the target speed of the adjustable extraction steam turbine.

[0145] Specifically, the dimensionless high-pressure valve rear pressure, the dimensionless low-pressure valve rear pressure and the dimensionless preset load parameter are added and substituted into the preset rotor equation of the adjustable extraction steam turbine to obtain the dimensionless target speed, that is, the rate of change compared to the initial speed. Then, the target speed of the adjustable extraction steam turbine is obtained according to the initial speed and the dimensionless target speed.

[0146] In summary, in this implementation, the preset load parameters of the adjustable extraction steam turbine are obtained; according to the high-pressure valve rear pressure, the low-pressure valve rear pressure and the preset load parameters, the preset rotor equation of the adjustable extraction steam turbine is used to calculate the target speed of the adjustable extraction steam turbine. Thus, by adding the influencing factors of the preset load parameters, the target speed of the adjustable extraction steam turbine is accurately calculated.

[0147] exist Figure 1 Based on this, the embodiment of the present application also provides another dynamic adjustment simulation method for an adjustable extraction steam turbine. Figure 6 This application also provides a flow chart of another dynamic adjustment simulation method for an adjustable extraction steam turbine. Figure 6 Said method further comprises:

[0148] S601. Recalculate the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber according to the target speed of the adjustable extraction steam turbine.

[0149] After the target speed of the adjustable extraction steam turbine is calculated, the calculated target speed of the adjustable extraction steam turbine is used as the initial input value of a new round, and input into the dynamic regulation simulation mathematical model of the adjustable extraction steam turbine, and the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber are recalculated respectively, and a new round of dynamic regulation simulation is started.

[0150] S602. Recalculate the speed of the adjustable extraction steam turbine according to the recalculated high-pressure valve rear pressure and low-pressure valve rear pressure, using a preset rotor equation, until the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine is within a preset deviation range.

[0151] The recalculated high-pressure valve rear pressure and low-pressure valve rear pressure are substituted into the preset rotor equation, and a new round of adjustable extraction steam turbine speed can be recalculated. At the same time, the recalculated speed is compared with the given speed of the adjustable extraction steam turbine. If the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine exceeds the preset deviation range, the steps in S601 are repeated until the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine is within the preset deviation range, and the simulation calculation is stopped. That is, the speed of the adjustable extraction steam turbine in the simulation has been adjusted to the normal speed range. Among them, the given speed and the preset deviation range of the adjustable extraction steam turbine can be set by the staff. The given speed of the adjustable extraction steam turbine is the speed of the adjustable extraction steam turbine when it is working normally, and the preset deviation range is the speed deviation range of the adjustable extraction steam turbine when it is working normally.

[0152] In summary, in this implementation, according to the target speed of the adjustable extraction steam turbine, the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber are recalculated respectively; according to the recalculated high pressure valve rear pressure and low pressure valve rear pressure, the preset rotor equation is used to recalculate the speed of the adjustable extraction steam turbine until the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine is within the preset deviation range. Thus, by setting the preset deviation range, multiple rounds of simulation calculations are performed to accurately obtain simulation results.

[0153] Figure 7 A flow chart of a method for recalculating the pressure after the high-pressure valve and the pressure after the low-pressure valve provided in an embodiment of the present application. Figure 7 As shown, in S602, according to the target speed of the adjustable extraction steam turbine, the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber are recalculated respectively, including:

[0154] S701. Use a preset speed inequality module of an adjustable extraction steam turbine to update a target speed.

[0155] The speed inequality rate refers to the ratio of the speed change of the turbine from full load to no load to the rated speed. The preset speed inequality rate is the speed inequality rate of a simulated adjustable extraction steam turbine. The staff can also set a reasonable speed inequality rate. For example, the speed inequality rate under normal circumstances is 3-6%.

[0156] The target speed is input into the preset speed inequality module of the adjustable extraction steam turbine to update the target speed. Specifically, the dimensionless target speed is subtracted from the preset speed inequality to obtain the updated dimensionless target speed. Comprehensive consideration of the speed inequality makes the simulation calculation more accurate. It should be noted here that when obtaining the initial speed of the adjustable extraction steam turbine, the preset speed inequality module of the adjustable extraction steam turbine can also be used to update the initial speed.

[0157] S702: Calculate the speed deviation according to the updated target speed and the given speed.

[0158] 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.

[0159] S703: recalculate the pressure after the high-pressure valve of the high-pressure steam chamber and the pressure after the low-pressure valve of the low-pressure steam chamber according to the rotation speed deviation.

[0160] The high pressure after the high pressure valve of the high pressure steam chamber and the low pressure after the low pressure valve of the low pressure steam chamber are recalculated according to the speed deviation. That is, the dimensionless high pressure after the high pressure valve and the dimensionless low pressure after the low pressure valve (i.e., the rate of change of the high pressure after the high pressure valve and the rate of change of the low pressure after the low pressure valve) are recalculated according to the dimensionless speed deviation, so as to facilitate the subsequent simulation calculation.

[0161] In summary, in this embodiment, the preset speed inequality module of the adjustable extraction steam turbine is used to update the target speed; the speed deviation is calculated according to the updated target speed and the given speed; and the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber are recalculated according to the speed deviation. Thus, by considering the preset speed inequality and the speed deviation, the simulation calculation results are made more accurate.

[0162] Continue to refer to Figure 7 , the method further comprises:

[0163] A speed rise curve of the adjustable extraction steam turbine is generated according to the speed calculated within a preset time period.

[0164] 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 according to 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. The speed rise curve reflects the speed change trend during the dynamic adjustment simulation of the adjustable extraction steam turbine. For example, during the dynamic adjustment simulation, the speed rise curve can be displayed in the simulation device; and in the actual adjustable extraction steam turbine, a speed oscilloscope can be set to display the speed rise curve in the speed oscilloscope.

[0165] The present application also provides a dynamic regulation simulation model of an adjustable extraction steam turbine. Figure 8 A schematic structural diagram of a dynamic regulation simulation model of an adjustable extraction steam turbine provided in an embodiment of the present application.

[0166] like Figure 8 As shown, the model includes: a high-pressure electro-hydraulic converter module 101, a high-pressure staggered throttle oil motor module 102, a main regulating valve position module 103, a high-pressure volume module 104, a preset power coefficient module 105 of a high-pressure steam chamber, a low-pressure electro-hydraulic converter module 201, a low-pressure staggered throttle oil motor module 202, a steam extraction overflow valve position module 203, a low-pressure volume module 204, a steam extraction link coefficient module 205, a preset power coefficient module 206 of a low-pressure steam chamber, a rotor equation module 300, a speed output module 301, a given speed module 302, a preset proportional integral differential control module 400, a load module 500, and a speed inequality module 600.

[0167] The high-pressure electro-hydraulic converter module 101 is provided with a preset high-pressure electro-hydraulic conversion equation; the high-pressure staggered throttle oil motor module 102 is provided with a preset high-pressure staggered throttle oil motor equation; the main regulating valve position module 103 can display the valve position of the main regulating valve and the valve position response curve of the main regulating valve; the high-pressure volume module 104 is provided with a preset high-pressure volume equation; the preset power coefficient module 105 of the high-pressure steam chamber is provided with a preset power coefficient of the high-pressure steam chamber; the low-pressure electro-hydraulic converter module 201 is provided with a preset low-pressure electro-hydraulic conversion equation; the low-pressure staggered throttle oil motor module 202 is provided with a preset low-pressure staggered throttle oil motor equation; the extraction steam overflow valve position module 203 can display the valve position of the extraction steam overflow valve and the extraction steam overflow The valve position response curve of the flow valve; the low-pressure volume module 204 is provided with a preset low-pressure volume equation; the extraction link coefficient module 205 is provided with an extraction link coefficient; the preset power coefficient module 206 of the low-pressure steam chamber is provided with a preset power coefficient of the low-pressure steam chamber; the rotor equation module 300 is provided with a preset rotor equation; the speed output module 301 can display the calculated target speed of the adjustable extraction steam turbine; the given speed module 302 can input the given speed; the preset proportional integral differential control module 400 is provided with a preset proportional integral differential control equation; the load module 500 can input the load parameter; the speed inequality module 600 is used to update the target speed according to the speed inequality.

[0168] Based on this model, Figure 1-Figure 7 The steps in the dynamic regulation simulation method of any adjustable extraction steam turbine.

[0169] The following is a description of a dynamic adjustment simulation device, equipment and storage medium for an adjustable extraction steam turbine provided by the present application. The specific implementation process and technical effects are described above and will not be repeated below.

[0170] Fig. 9 A schematic diagram of a dynamic regulation simulation device for an adjustable steam extraction steam turbine provided in an embodiment of the present application, wherein the adjustable steam extraction steam turbine comprises a main regulating valve, a high-pressure steam chamber corresponding to the main regulating valve, an extraction steam relief valve, a low-pressure steam chamber corresponding to the extraction steam relief valve, and a rotor; Fig. 9 As shown, the simulation device may include:

[0171] The first calculation module 901 is used to calculate the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber according to the initial rotation speed of the adjustable extraction steam turbine.

[0172] The second calculation module 902 is used to calculate the target speed of the adjustable extraction steam turbine according to the high-pressure valve rear pressure and the low-pressure valve rear pressure by using the preset rotor equation of the adjustable extraction steam turbine.

[0173] Optionally, the first calculation module 901 is specifically used to calculate the control current of the main regulating valve and the control current of the extraction steam relief valve according to the initial speed of the adjustable extraction steam turbine by using a preset proportional integral differential controller of the adjustable extraction steam turbine; calculate the pressure behind the high-pressure valve according to the control current of the main regulating valve by using a control model corresponding to the main regulating valve; calculate the pressure behind the low-pressure valve according to the control current of the extraction steam relief valve by using a control model corresponding to the extraction steam relief valve.

[0174] Optionally, the first calculation module 901 is further specifically used to calculate the secondary oil pressure parameters of the main regulating valve using a high-pressure electro-hydraulic converter module according to the control current of the main regulating valve; calculate the valve position parameters of the main regulating valve using a high-pressure throttle oil motor module according to the secondary oil pressure parameters of the main regulating valve; calculate the valve post-valve pressure of the main regulating valve using a high-pressure volume module according to the valve position parameters of the main regulating valve; calculate the high-pressure valve post-valve pressure according to the valve post-valve pressure of the main regulating valve and the preset power coefficient of the high-pressure steam chamber.

[0175] Optionally, the first calculation module 901 is further configured to generate a valve position response curve of the main regulating valve according to the valve position parameters of the main regulating valve calculated within a preset time period.

[0176] Optionally, the first calculation module 901 is further specifically used to calculate the secondary oil pressure parameters of the steam extraction relief valve using a low-pressure electro-hydraulic converter module according to the control current of the steam extraction relief valve; to calculate the valve position parameters of the steam extraction relief valve using a low-pressure throttle oil motor module according to the secondary oil pressure parameters of the steam extraction relief valve; to calculate the valve post pressure of the steam extraction relief valve using a low-pressure volume module according to the valve position parameters of the steam extraction relief valve; and to calculate the low-pressure valve post pressure based on the valve post pressure of the steam extraction relief valve and the preset power coefficient of the low-pressure steam chamber.

[0177] Optionally, the first calculation module 901 is further configured to generate a valve position response curve of the steam extraction relief valve according to the valve position parameters of the steam extraction relief valve calculated within a preset time period.

[0178] Optionally, the second calculation module 902 is specifically used to obtain the preset load parameters of the adjustable extraction steam turbine; according to the high-pressure valve rear pressure, the low-pressure valve rear pressure and the preset load parameters, the preset rotor equation of the adjustable extraction steam turbine is used to calculate the target speed of the adjustable extraction steam turbine.

[0179] Optionally, the first calculation module 901 is further used to recalculate the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber according to the target speed of the adjustable extraction steam turbine.

[0180] Optionally, the second calculation module 902 is also used to recalculate the speed of the adjustable extraction steam turbine based on the recalculated high-pressure valve rear pressure and low-pressure valve rear pressure, using a preset rotor equation, until the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine is within a preset deviation range.

[0181] Optionally, the second calculation module 902 is specifically used to update the target speed using a preset speed inequality module of the adjustable extraction steam turbine; calculate the speed deviation based on the updated target speed and the given speed; and recalculate the high-pressure valve rear pressure of the high-pressure steam chamber and the low-pressure valve rear pressure of the low-pressure steam chamber based on the speed deviation.

[0182] Optionally, the second calculation module 902 is further configured to generate a speed rise curve of the adjustable extraction steam turbine according to the speed calculated within a preset time period.

[0183] 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 processor 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).

[0184] Fig.10 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.

[0185] The simulation device includes: a processor 1001 and a storage medium 1002. The processor 1001 and the storage medium 1002 are connected via a bus.

[0186] The storage medium 1002 is used to store programs, and the processor 1001 calls the programs stored in the storage medium 1002 to execute the above method embodiment. The specific implementation method and technical effect are similar and will not be repeated here.

[0187] 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.

[0188] In the 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0189] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0190] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0191] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program codes.

Claims

1. A dynamic adjustment simulation method for an adjustable extraction steam turbine, characterized in that: The adjustable steam extraction steam turbine comprises a main regulating valve, a high-pressure steam chamber corresponding to the main regulating valve, a steam extraction relief valve, a low-pressure steam chamber corresponding to the steam extraction relief valve, and a rotor; the method comprises: According to the initial rotation speed of the adjustable extraction steam turbine, respectively calculating the pressure after the high-pressure valve of the high-pressure steam chamber and the pressure after the low-pressure valve of the low-pressure steam chamber; According to the high-pressure valve rear pressure and the low-pressure valve rear pressure, the target speed of the adjustable extraction steam turbine is calculated by using a preset rotor equation of the adjustable extraction steam turbine.

2. The method according to claim 1, characterized in that The method of calculating the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber respectively according to the initial speed of the adjustable extraction steam turbine comprises: According to the initial speed of the adjustable extraction steam turbine, a preset proportional integral differential controller of the adjustable extraction steam turbine is used to calculate the control current of the main regulating valve and the control current of the extraction relief valve; According to the control current of the main regulating valve, the pressure after the high-pressure valve is calculated by using the control model corresponding to the main regulating valve; The low-pressure valve rear pressure is calculated according to the control current of the steam extraction relief valve and using a control model corresponding to the steam extraction relief valve.

3. The method according to claim 2, characterized in that The control model corresponding to the main regulating valve includes: a high-pressure electro-hydraulic converter module, a high-pressure staggered throttle oil motor module, and a high-pressure volume module; the control model corresponding to the main regulating valve is used to calculate the pressure after the high-pressure valve according to the control current of the main regulating valve, including: According to the control current of the main regulating valve, the secondary oil pressure parameter of the main regulating valve is calculated by using the high-pressure electro-hydraulic converter module; According to the secondary oil pressure parameter of the main regulating valve, the valve position parameter of the main regulating valve is calculated by using the high-pressure staggered throttle oil motor module; According to the valve position parameter of the main regulating valve, the valve rear pressure of the main regulating valve is calculated by using the high pressure volume module; The high-pressure valve rear pressure is calculated according to the valve rear pressure of the main regulating valve and the preset power coefficient of the high-pressure steam chamber.

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

5. The method according to claim 2, characterized in that: The control model corresponding to the steam extraction relief valve includes: a low-pressure electro-hydraulic converter module, a low-pressure throttle oil motor module, and a low-pressure volume module; the low-pressure valve rear pressure is calculated according to the control current of the steam extraction relief valve and the control model corresponding to the steam extraction relief valve, including: According to the control current of the extraction steam relief valve, the secondary oil pressure parameter of the extraction steam relief valve is calculated by using the low-voltage electro-hydraulic converter module; According to the secondary oil pressure parameter of the extraction steam relief valve, the valve position parameter of the extraction steam relief valve is calculated by using the low-pressure throttle oil motor module; According to the valve position parameter of the steam extraction relief valve, the valve rear pressure of the steam extraction relief valve is calculated by using the low-pressure volume module; The low-pressure valve rear pressure is calculated according to the valve rear pressure of the steam extraction relief valve and the preset power coefficient of the low-pressure steam chamber.

6. The method according to claim 5, characterized in that The method further comprises: A valve position response curve of the steam extraction relief valve is generated according to the valve position parameters of the steam extraction relief valve calculated within a preset time period.

7. The method according to claim 1, characterized in that The method of calculating the target speed of the adjustable steam extraction type steam turbine according to the high pressure valve rear pressure and the low pressure valve rear pressure and using the preset rotor equation of the adjustable steam extraction type steam turbine comprises: Obtaining preset load parameters of the adjustable extraction steam turbine; According to the high-pressure valve rear pressure, the low-pressure valve rear pressure and the preset load parameter, the target speed of the adjustable extraction steam turbine is calculated using the preset rotor equation of the adjustable extraction steam turbine.

8. The method according to claim 1, characterized in that The method further comprises: recalculating the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber respectively according to the target speed of the adjustable extraction steam turbine; According to the recalculated high-pressure valve rear pressure and low-pressure valve rear pressure, the preset rotor equation is used to recalculate the speed of the adjustable extraction steam turbine until the deviation between the recalculated speed and the given speed of the adjustable extraction steam turbine is within a preset deviation range.

9. The method according to claim 8, characterized in that The recalculating the high pressure valve rear pressure of the high pressure steam chamber and the low pressure valve rear pressure of the low pressure steam chamber respectively according to the target speed of the adjustable extraction steam turbine comprises: Adopting the preset speed droop module of the adjustable extraction steam turbine to update the target speed; Calculating a speed deviation according to the updated target speed and the given speed; According to the rotation speed deviation, the high-pressure valve downstream pressure of the high-pressure steam chamber and the low-pressure valve downstream pressure of the low-pressure steam chamber are recalculated respectively.

10. The method according to claim 9, characterized in that The method further comprises: A speed rise curve of the adjustable extraction steam turbine is generated according to the speed calculated within a preset time period.

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