A method and device for generating equivalent flow of a steam turbine

Abstract

An embodiment of the present invention provides a method and device for generating equivalent flow of a steam turbine, the method comprising: performing flow conversion according to an acquired flow instruction and a comprehensive valve position to generate a valve regulating instruction; executing a valve regulating action according to the valve regulating instruction to obtain a valve regulating action amount; performing valve conversion on the valve regulating action amount and the acquired valve regulating position to generate an equivalent flow, taking into account the actual action process between the flow instruction and the equivalent flow during a frequency modulation process of the unit, and more accurately reflecting the dynamic change process of the unit flow.

Description

Technical Field

[0001] The present invention relates to the technical field of power system modeling and simulation, and in particular to a method and device for generating equivalent flow of a steam turbine. Background Art

[0002] With the development of the power system, the scale of the power grid continues to expand. The importance of power grid security and its stable operation has become increasingly prominent. Power grid stability analysis plays a very important role in studying the safety of power grid operation and simulating the dynamic changes of the power grid under fault conditions, thereby ensuring the safe and stable operation of the power grid. In related technologies, the actuator model in the steam turbine adopts a 1:1 proportional relationship between the flow command and the valve opening, ignoring the change of flow output over time. As a result, the actual action process from the flow command to the equivalent flow is too large, and it cannot accurately reflect the dynamic change process of the unit flow. Summary of the Invention

[0003] One object of the present invention is to provide a method for generating an equivalent flow rate for a steam turbine, which takes into account the actual process from flow command to equivalent flow rate during a unit's primary frequency modulation, and can more accurately reflect the dynamic changes in the unit's flow rate. Another object of the present invention is to provide a device for generating an equivalent flow rate for a steam turbine. Another object of the present invention is to provide a computer-readable medium. Yet another object of the present invention is to provide a computer device.

[0004] In order to achieve the above objectives, the present invention discloses a method for generating equivalent flow of a steam turbine, comprising:

[0005] Flow conversion is performed based on the acquired flow instruction and comprehensive valve position to generate valve adjustment instructions;

[0006] Execute valve regulating action according to valve regulating instruction and obtain valve regulating action amount;

[0007] The valve conversion is performed on the regulating valve movement amount and the obtained regulating valve position to generate an equivalent flow rate.

[0008] Preferably, the flow instruction includes a flow step amount, and the valve adjustment instruction includes a valve adjustment step amount;

[0009] Flow conversion is performed based on the acquired flow command and integrated valve position to generate valve adjustment commands, including:

[0010] Through the constructed first valve control function, the flow step amount and the integrated valve position are converted into flow, and the valve regulating step amount is generated;

[0011] Generate valve control instructions based on the valve control step amount.

[0012] Preferably, before performing flow conversion on the flow step amount and the integrated valve position by using the constructed first valve control function to generate the valve adjustment step amount, the method further includes:

[0013] Obtain a corresponding relationship table between flow rate step amount and valve regulating step amount;

[0014] By setting a piecewise linear function, a first valve control function is constructed according to the obtained correspondence table between the flow step amount and the valve regulating step amount.

[0015] Preferably, the flow rate step amount and the integrated valve position are converted into flow rate by constructing the first valve control function to generate the valve adjustment step amount, including:

[0016] Calculate the flow step amount and the integrated valve position through the first valve control function to obtain the first adjustment threshold value;

[0017] The comprehensive valve position is calculated by the first valve control function to obtain the second adjustment threshold value;

[0018] A valve regulating step amount is generated according to the first threshold regulating value and the second threshold regulating value.

[0019] Preferably, performing valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate includes:

[0020] By constructing the second valve control function, valve conversion is performed on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate.

[0021] Preferably, before performing valve conversion on the regulating valve action amount and the acquired regulating valve position by using the constructed second valve control function to generate an equivalent flow, the method further includes:

[0022] An inverse function of the first valve control function is determined as a second valve control function.

[0023] Preferably, the second valve control function is constructed to perform valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate, including:

[0024] Calculating the regulating valve movement amount and the regulating valve position through the second valve control function to obtain a first flow value;

[0025] Calculating the regulating valve position through the second valve control function to obtain a second flow value;

[0026] An equivalent flow rate is generated according to the first flow rate value and the second adjusted flow rate value.

[0027] The present invention also discloses a steam turbine equivalent flow generating device, comprising:

[0028] The flow conversion module is used to convert the flow according to the acquired flow instruction and the integrated valve position and generate the valve adjustment instruction;

[0029] The valve regulating action module is used to execute the valve regulating action according to the valve regulating instruction and obtain the valve regulating action amount;

[0030] The valve conversion module is used to perform valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate.

[0031] Preferably, the flow instruction includes a flow step amount, and the valve adjustment instruction includes a valve adjustment step amount;

[0032] The flow conversion module is specifically used to convert the flow step amount and the comprehensive valve position through the constructed first valve control function to generate the valve adjustment step amount; and generate the valve adjustment instruction according to the valve adjustment step amount.

[0033] Preferably, the device further comprises:

[0034] An acquisition unit, used for acquiring a corresponding relationship table between flow rate step amounts and valve regulating step amounts;

[0035] The first construction unit is configured to construct a first valve control function according to the obtained correspondence table between the flow step amount and the valve regulating step amount by using a set piecewise linear function.

[0036] Preferably, the flow conversion module is specifically used to calculate the flow step amount and the integrated valve position through the first valve control function to obtain the first valve adjustment value; calculate the integrated valve position through the first valve control function to obtain the second valve adjustment value; and generate the valve adjustment step amount according to the first valve adjustment value and the second valve adjustment value.

[0037] Preferably, the valve conversion module is specifically used to perform valve conversion on the regulating valve action amount and the obtained regulating valve position through the constructed second valve control function to generate an equivalent flow rate.

[0038] Preferably, the device further comprises:

[0039] The second constructing unit is configured to determine an inverse function of the first valve control function as a second valve control function.

[0040] Preferably, the valve conversion module is specifically used to calculate the regulating valve action amount and the regulating valve position through the second valve control function to obtain a first flow value; calculate the regulating valve position through the second valve control function to obtain a second flow value; and generate an equivalent flow based on the first flow value and the second regulating flow value.

[0041] The present invention also discloses a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described above is implemented.

[0042] The present invention also discloses a computer device, including a memory and a processor, wherein the memory is used to store information including program instructions, the processor is used to control the execution of program instructions, and the processor implements the above method when executing the program.

[0043] The present invention also discloses a computer program product, comprising a computer program / instruction, which implements the above method when the computer program / instruction is executed by a processor.

[0044] The present invention performs flow conversion according to the obtained flow instruction and the comprehensive valve position to generate a valve regulating instruction; executes a valve regulating action according to the valve regulating instruction to obtain a valve regulating action amount; performs valve conversion on the valve regulating action amount and the obtained valve regulating position to generate an equivalent flow, taking into account the actual action process between the flow instruction and the equivalent flow during a frequency modulation process of the unit, and can more accurately reflect the dynamic change process of the unit flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A schematic structural diagram of an actuator model provided in an embodiment of the present invention;

[0047] Figure 2 A flow chart of a method for generating equivalent flow of a steam turbine provided by an embodiment of the present invention;

[0048] Figure 3 A flow chart of another method for generating equivalent flow of a steam turbine provided by an embodiment of the present invention;

[0049] Figure 4 A logical diagram of traffic conversion provided by an embodiment of the present invention;

[0050] Figure 5 A logic diagram of a valve regulating action provided by an embodiment of the present invention;

[0051] Figure 6 A logic diagram of valve conversion provided by an embodiment of the present invention;

[0052] Figure 7 A schematic diagram of a first valve control function provided by an embodiment of the present invention;

[0053] Figure 8A schematic diagram of a second valve control function provided by an embodiment of the present invention;

[0054] Figure 9 A comparison chart of simulation results provided by an embodiment of the present invention;

[0055] Figure 10 A comparison diagram of another simulation result provided by an embodiment of the present invention;

[0056] Figure 11 A comparison diagram of another simulation result provided by an embodiment of the present invention;

[0057] Figure 12 A schematic structural diagram of a steam turbine equivalent flow generating device provided by an embodiment of the present invention;

[0058] Figure 13 A schematic structural diagram of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] In order to facilitate the understanding of the technical solution provided by this application, the relevant contents of the technical solution of this application are first explained below. In recent years, the industry and the outside world have widely carried out testing of the "four major parameters", namely: the establishment and parameter acquisition of generators, excitation systems, speed control systems and load models. As the main force in the power supply market, steam turbine generator sets occupy a vital position in the entire power system, and the performance and dynamic characteristics of steam turbines and their regulation systems play an important role in regulating the frequency of the entire power grid, responding to power grid load changes in a timely manner, and ensuring power grid security. Existing models of steam turbines and their speed control systems include a speed control system model, an actuator model, and a turbine model. For ease of engineering application, the actuator model simplifies the actual operating process and does not consider the conversion process between flow commands and valve opening commands. In actual unit operation, this process is accomplished by the valve management function, and the flow command and valve opening are often not in a 1:1 ratio. Ignoring this conversion process results in differences between the dynamics of the model's output equivalent flow and the actual dynamics. This difference primarily manifests in the temporal characteristics of the flow output. When the system reaches steady state, the flow output magnitude remains the same, but the dynamics of the flow over time differ. In some cases, particularly at the valve "inflection point" (where the flow command changes slightly but the valve control command changes significantly), this effect cannot be ignored. With the increasing proportion of renewable energy generation in the power grid and the increasing pressure for frequency regulation, developing a more accurate model becomes increasingly important for grid stability research. Therefore, it is increasingly necessary to develop a steam turbine actuator model that considers the conversion between flow and valve position.

[0061] Figure 1 FIG. 1 is a structural diagram of an actuator model provided in an embodiment of the present invention, such as Figure 1 As shown in the figure, the actuator model includes a flow conversion module, a valve control action module and a valve position conversion module. The flow conversion module is connected to the valve control action module, and the valve control action module is connected to the valve position conversion module. The function of the flow conversion module is to convert the flow instruction step amount into the valve control instruction step amount; the function of the valve control action module is to complete the action process of the valve control in the primary frequency modulation test of the unit; the function of the valve conversion module is to convert the valve control action amount F GV Convert to equivalent flow Q. The flow instruction P transmitted by the speed control system model CV And the obtained comprehensive valve position P wt Input to the flow conversion module for flow conversion, output valve adjustment instruction P GV ; Set the valve control instruction P GV The input valve action module performs the valve action and outputs the valve action amount F GV ; Set the valve action F GV And the obtained regulating valve position F wtThe input valve position conversion module performs valve position conversion, outputs equivalent flow Q, and the actuator action is completed.

[0062] The current guidelines require modeling and simulation of steam turbines and their speed regulation systems, primarily focusing on the unit's primary frequency regulation process. During actual primary frequency regulation testing, the unit transitions from one steady-state to another. The specific process involves a deviation between the unit speed and the set reference value. This deviation causes the speed regulation system to change the unit's flow rate command. This flow rate command, generated through the valve management function, generates a valve opening command. The valve then operates (opens it wider or narrower), increasing or decreasing the flow rate entering the turbine, thereby increasing or decreasing the unit's load.

[0063] The following uses a steam turbine equivalent flow rate generating device as an example to illustrate the implementation process of the steam turbine equivalent flow rate generating method provided by the embodiment of the present invention. It is understood that the implementation subject of the steam turbine equivalent flow rate generating method provided by the embodiment of the present invention includes but is not limited to the steam turbine equivalent flow rate generating device.

[0064] Figure 2 A flow chart of a method for generating equivalent flow of a steam turbine provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the method includes:

[0065] Step 101: Perform flow conversion based on the acquired flow instruction and integrated valve position to generate a valve adjustment instruction.

[0066] In the embodiment of the present invention, the flow instruction includes a flow step amount, and the valve regulating instruction includes a valve regulating step amount.

[0067] Step 102: Execute the valve regulating action according to the valve regulating instruction to obtain the valve regulating action amount.

[0068] Step 103: Perform valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate.

[0069] In the technical solution provided by the embodiment of the present invention, flow conversion is performed according to the obtained flow instruction and the comprehensive valve position to generate a valve regulating instruction; the valve regulating action is executed according to the valve regulating instruction to obtain the valve regulating action amount; valve conversion is performed on the valve regulating action amount and the obtained valve regulating position to generate an equivalent flow, which takes into account the actual action process between the flow instruction and the equivalent flow during a frequency modulation process of the unit, and can more accurately reflect the dynamic change process of the unit flow.

[0070] Figure 3 A flow chart of another method for generating equivalent flow of a steam turbine provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the method includes:

[0071] Step 201: Obtain a corresponding relationship table between flow rate step amounts and valve regulating step amounts.

[0072] In the embodiment of the present invention, each step is performed by a steam turbine equivalent flow generating device.

[0073] In the embodiment of the present invention, the flow step amount is obtained by the flow instruction P CV Transmitted, used to indicate the change in flow rate during the unit's transition from one steady state to another.

[0074] In the embodiments of the present invention, the correspondence between flow rate step values ​​and valve control step values ​​is derived from actual experiments. As an alternative, the flow rate step values ​​are indicated in increments of 1% from 0 to 100% in the unit control logic, and the corresponding valve openings are recorded. The recorded valve openings are the valve control step values. A table of correspondence between flow rate step values ​​and valve control step values ​​is constructed by recording the multiple incremental flow rate step values ​​and the corresponding valve control step values ​​for each flow rate step value.

[0075] Step 202: construct a first valve control function by using a set piecewise linear function and according to the obtained correspondence table between flow rate step amounts and valve regulating step amounts.

[0076] Specifically, by setting a piecewise linear function, with the flow step amount as the independent variable and the valve regulating step amount as the dependent variable, a first function f(x) is constructed according to the correspondence table between the flow step amount and the valve regulating step amount; the dependent variable valve regulating step amount and the independent variable flow step amount of the first function f(x) are normalized, and the normalized flow step amount is used as the independent variable and the normalized valve regulating step amount is used as the dependent variable to construct the first valve control function f1(x).

[0077] In the embodiment of the present invention, the first valve control function can be constructed in a variety of ways, and the embodiment of the present invention does not limit the specific method of constructing the first valve control function. As another optional solution, the corresponding relationship between the flow step amount and the valve regulating step amount is obtained by consulting the valve management curve in the unit control logic configuration, and the flow step amount is used as the independent variable and the valve regulating step amount as the dependent variable to construct the first function f(x); the dependent variable valve regulating step amount and the independent variable flow step amount of the first function f(x) are normalized, and the normalized flow step amount is used as the independent variable and the normalized valve regulating step amount is used as the dependent variable to construct the first valve control function f1(x).

[0078] Step 203: Perform flow conversion on the flow step amount and the integrated valve position through the constructed first valve control function to generate a valve adjustment step amount.

[0079] Figure 4 A logical diagram of traffic conversion provided by an embodiment of the present invention, such as Figure 4 As shown, the flow instruction P CVAnd comprehensive valve position P wt Input the first valve control function to obtain the first adjustment threshold value; the integrated valve position P wt Input the first valve control function to obtain the second valve value; subtract the first valve value from the second valve value to obtain the difference as the valve step value; output the valve control instruction P according to the valve step value GV Among them, the flow instruction P CV Includes flow step amount.

[0080] In the embodiment of the present invention, step 203 specifically includes:

[0081] Step 2031: Calculate the flow step amount and the integrated valve position through the first valve control function to obtain a first adjustment threshold value.

[0082] In the embodiment of the present invention, the comprehensive valve position P wt It is the valve position of the unit before the frequency regulation is activated, that is, the valve position in the current stable state.

[0083] Specifically, the flow step amount and the integrated valve position are calculated by the first valve control function f1(x) to obtain a first valve adjustment value, which is the opening degree.

[0084] Step 2032: Calculate the comprehensive valve position through the first valve control function to obtain the second adjustment threshold value.

[0085] Specifically, the comprehensive valve position is calculated through the first valve control function f1(x) to obtain the second valve adjustment value, which is the opening degree.

[0086] Step 2033: Generate a valve adjustment step value according to the first threshold adjustment value and the second threshold adjustment value.

[0087] In the embodiment of the present invention, the difference between the first threshold adjustment value and the second threshold adjustment value is determined as the valve adjustment step amount, and the valve adjustment step amount is the opening degree.

[0088] Step 204: Generate a valve adjustment instruction according to the valve adjustment step amount.

[0089] In the embodiment of the present invention, the valve adjustment instruction P GV Includes valve step amount, which is used to indicate the opening size and direction of the valve action.

[0090] Step 205: Execute the valve regulating action according to the valve regulating instruction to obtain the valve regulating action amount.

[0091] Figure 5 A logic diagram of a valve regulating action provided by an embodiment of the present invention is as follows: Figure 5 As shown, the valve control instruction P GVThe deviation value between the valve regulating action amount fed back by the inertia time and the feedback module is input into the servo card automatic control (PID) module; the servo card PID module automatically corrects the deviation value through the internal proportional gain (Kp), differential gain (KD) and integral gain (Ki), and outputs the intermediate parameter through the servo card limiter module. The output upper limit of the servo card limiter module is 1, and the output lower limit is -1. By setting the upper and lower limits of the intermediate parameters, the output range of the servo card PID module is limited. Specifically, if the result output by the servo card PID module is greater than 1, the intermediate parameter output by the servo card limiter module is 1; if the result output by the servo card PID module is less than -1, the intermediate parameter output by the servo card limiter module is -1; the valve switching rate is obtained through the valve switching rate module. As an optional solution, the valve switching rate value can be 1 or -1; the valve switching time constant is obtained through the valve switching test. If the valve is open, the time constant T is obtained. o ; If the valve is open, get the time constant T c ; Input the intermediate parameters, valve switching rate and the inverse of the valve switching time constant into the oil motor integral module for calculation, and output the valve adjustment action amount F GV ; According to the delay time specified in the delay module, the output valve action amount F GV ; Through the feedback module, the valve action amount F GV According to the set inertia time T i (1 / (1+T i s)) for feedback. As an optional solution, the feedback module T i The value of is 0.02, 1 / (1+T i s) is the inertia link, and s is a complex variable.

[0092] Step 206: Perform valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate.

[0093] Specifically, the inverse function of the first valve control function is determined as the second valve control function; and through the constructed second valve control function, valve conversion is performed on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate.

[0094] Figure 6 A logic diagram of a valve conversion provided by an embodiment of the present invention, such as Figure 6 As shown, adjust the valve action F GV and regulating valve position F wt Input the second valve control function to obtain the first flow value; adjust the valve position F wt Input the second valve control function to obtain a second flow value; subtract the first flow value from the second flow value, obtain the difference as an equivalent flow Q, and output the equivalent flow Q.

[0095] In the embodiment of the present invention, step 206 specifically includes:

[0096] Step 2061: Calculate the valve adjustment amount and the valve position through the second valve control function to obtain a first flow value.

[0097] In the embodiment of the present invention, the regulating valve position F wt It is the valve opening of the unit before a frequency modulation action, that is, the current valve position.

[0098] Specifically, the regulating valve action amount and the regulating valve position are calculated by the second valve control function f2(x) to obtain the first flow value.

[0099] Step 2062: Calculate the regulating valve position through the second valve control function to obtain a second flow value.

[0100] Specifically, the valve position of the regulating valve is calculated by the second valve control function f2(x) to obtain the second flow value.

[0101] Step 2063: Generate an equivalent flow rate according to the first flow rate value and the second adjusted flow rate value.

[0102] In the embodiment of the present invention, the difference between the first flow value and the second adjusted flow value is determined as the equivalent flow Q.

[0103] Taking a 350MW supercritical unit as an example, Figure 7 A schematic diagram of a first valve control function provided by an embodiment of the present invention is shown as follows: Figure 7 As shown, the horizontal axis of the constructed first valve control function f1(x) is the normalized flow rate step value, and the vertical axis is the normalized valve adjustment step value. Figure 8 A schematic diagram of a second valve control function provided by an embodiment of the present invention is shown as follows: Figure 8 As shown, the second valve control function f2(x) is Figure 7 The inverse function of the first valve control function f1(x) is shown in FIG. The horizontal axis of the second valve control function f2(x) is the valve step amount, and the vertical axis is the equivalent flow rate. Figure 7 The first valve control function shown and Figure 8 Taking the second valve control function shown in FIG2 as an example, a simulation comparison is performed on the steam turbine equivalent flow generation process under the traditional model and the steam turbine equivalent flow generation process under the actuator model provided by the present invention. Figure 9 A comparison diagram of simulation results provided by an embodiment of the present invention is shown in FIG. Figure 9As shown in FIG, the 350MW supercritical unit Kp=17, KD=0, Ki=0, To=1.5, Tc=1.2, delay is 0, Ti=0.02 are obtained through identification. The above parameters are input into the actuator model provided by the present invention and the traditional model for simulation. When the flow command changes stepwise from 0.4 to 0.5, as shown in FIG. Figure 9 As shown, the horizontal axis is time, the unit is seconds (s), the vertical axis is the equivalent flow rate, the black straight line is the simulation result of the traditional model, and the black dotted line is the simulation result of the actuator model of the present invention. Under the control of the first valve control function f1(x) and the second valve control function f2(x), the simulation result of the actuator model of the present invention is more in line with the actual action process and can more accurately reflect the dynamic change process of the unit flow rate.

[0104] Figure 10 Another simulation result comparison diagram provided by the embodiment of the present invention is as follows: Figure 10 As shown in FIG, the 350MW supercritical unit Kp = 17, KD = 0, Ki = 0, To = 1.5, Tc = 1.2, delay is 0, Ti = 0.02, and the above parameters are input into the actuator model provided by the present invention and the traditional model for simulation. When the flow command changes from 0.95 to 1 in a step, as shown in FIG. Figure 10 As shown, the horizontal axis is time, the unit is seconds (s), the vertical axis is the equivalent flow rate, the black dotted line is the simulation result of the traditional model, and the black solid line is the simulation result of the actuator model of the present invention. Under the control of the first valve control function f1(x) and the second valve control function f2(x), the simulation result of the actuator model of the present invention is more in line with the actual action process and can more accurately reflect the dynamic change process of the unit flow rate.

[0105] Figure 11 Another simulation result comparison diagram provided by the embodiment of the present invention is as follows: Figure 11 As shown in FIG, the 350MW supercritical unit Kp=17, KD=0, Ki=0, To=1.5, Tc=1.2, delay is 0, Ti=0.02 are obtained by identification. The above parameters are input into the actuator model provided by the present invention and the traditional model for simulation. When the flow command changes stepwise from 0.925 to 0.9, as shown in FIG. Figure 11 As shown, the horizontal axis is time, the unit is seconds (s), the vertical axis is the equivalent flow rate, the black dotted line is the simulation result of the traditional model, and the black solid line is the simulation result of the actuator model of the present invention. Under the control of the first valve control function f1(x) and the second valve control function f2(x), the simulation result of the actuator model of the present invention is more in line with the actual action process and can more accurately reflect the dynamic change process of the unit flow rate.

[0106] In the technical solution of the method for generating equivalent flow of a steam turbine provided by an embodiment of the present invention, flow conversion is performed according to the obtained flow instruction and the comprehensive valve position to generate a valve regulating instruction; a valve regulating action is executed according to the valve regulating instruction to obtain a valve regulating action amount; a valve conversion is performed on the valve regulating action amount and the obtained valve regulating valve position to generate an equivalent flow, which takes into account the actual action process between the flow instruction and the equivalent flow during a frequency modulation process of the unit, and can more accurately reflect the dynamic change process of the unit flow.

[0107] Figure 12 A schematic structural diagram of a steam turbine equivalent flow generation device provided by an embodiment of the present invention, wherein the device is used to execute the above-mentioned steam turbine equivalent flow generation method, such as Figure 12 As shown, the device includes: a flow conversion module 11, a valve adjustment action module 12 and a valve conversion module 13.

[0108] The flow conversion module 11 is used to perform flow conversion according to the acquired flow instruction and the integrated valve position, and generate a valve adjustment instruction.

[0109] The valve regulating action module 12 is used to execute the valve regulating action according to the valve regulating instruction and obtain the valve regulating action amount.

[0110] The valve conversion module 13 is used to perform valve conversion on the regulating valve action amount and the acquired regulating valve position to generate an equivalent flow rate.

[0111] In an embodiment of the present invention, the flow instruction includes a flow step amount, and the valve regulating instruction includes a valve regulating step amount; the flow conversion module 11 is specifically used to perform flow conversion on the flow step amount and the integrated valve position through the constructed first valve control function to generate the valve regulating step amount; and generate the valve regulating instruction according to the valve regulating step amount.

[0112] In the embodiment of the present invention, the device further includes: an acquisition unit 14 and a first construction unit 15 .

[0113] The acquisition unit 14 is used to obtain a corresponding relationship table between flow rate step amounts and valve regulating step amounts.

[0114] The first constructing unit 15 is configured to construct a first valve control function according to the obtained correspondence table between the flow rate step amount and the valve regulating step amount by using a set piecewise linear function.

[0115] In an embodiment of the present invention, the flow conversion module 11 is specifically used to calculate the flow step amount and the comprehensive valve position through the first valve control function to obtain the first valve adjustment value; calculate the comprehensive valve position through the first valve control function to obtain the second valve adjustment value; and generate the valve adjustment step amount according to the first valve adjustment value and the second valve adjustment value.

[0116] In the embodiment of the present invention, the valve conversion module 13 is specifically configured to perform valve conversion on the regulating valve action amount and the acquired regulating valve position through the constructed second valve control function to generate an equivalent flow rate.

[0117] In this embodiment of the present invention, the device further includes: a second constructing unit 16 .

[0118] The second constructing unit 16 is configured to determine an inverse function of the first valve control function as a second valve control function.

[0119] In an embodiment of the present invention, the valve conversion module 13 is specifically used to calculate the regulating valve action amount and the regulating valve position through the second valve control function to obtain a first flow value; calculate the regulating valve position through the second valve control function to obtain a second flow value; and generate an equivalent flow based on the first flow value and the second regulating flow value.

[0120] In the solution of the embodiment of the present invention, flow conversion is performed based on the obtained flow instruction and the comprehensive valve position to generate a valve regulating instruction; the valve regulating action is executed based on the valve regulating instruction to obtain the valve regulating action amount; valve conversion is performed on the valve regulating action amount and the obtained valve regulating valve position to generate an equivalent flow, which takes into account the actual action process between the flow instruction and the equivalent flow during a frequency modulation process of the unit, and can more accurately reflect the dynamic change process of the unit flow.

[0121] The systems, devices, modules, or units described in the above embodiments may be implemented by computer chips or entities, or by products having certain functions. A typical implementation device is a computer device. Specifically, the computer device may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0122] An embodiment of the present invention provides a computer device including a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions. When the program instructions are loaded and executed by the processor, the steps of the embodiment of the above-mentioned method for generating equivalent flow of a steam turbine are implemented. For a specific description, please refer to the embodiment of the above-mentioned method for generating equivalent flow of a steam turbine.

[0123] Reference below Figure 13 , which shows a structural diagram of a computer device 600 suitable for implementing an embodiment of the present application.

[0124] like Figure 13As shown, the computer device 600 includes a central processing unit (CPU) 601, which can perform various appropriate tasks and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage portion 608 into a random access memory (RAM) 603. Various programs and data required for the operation of the computer device 600 are also stored in the RAM 603. The CPU 601, ROM 602, and RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0125] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, and the like; an output section 607 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 608 including devices such as a hard disk; and a communication section 609 including a network interface card such as a LAN card or a modem. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. Removable media 611, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 610 as needed, so that computer programs read therefrom can be installed in the storage section 608 as needed.

[0126] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program including program code for executing the methods illustrated in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication portion 609 and / or installed from removable media 611.

[0127] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0128] For the convenience of description, the above devices are described as being divided into various units according to their functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0129] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0130] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0132] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0133] The acquisition, storage, use, and processing of data in this application's technical solution comply with relevant national laws and regulations.

[0134] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0135] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0136] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0137] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for generating equivalent flow of a steam turbine, characterized in that: The method comprises: Flow conversion is performed based on the acquired flow instruction and comprehensive valve position to generate valve adjustment instructions; Execute the valve regulating action according to the valve regulating instruction to obtain the valve regulating action amount; Performing valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate; The flow instruction includes a flow step amount, and the valve regulating instruction includes a valve regulating step amount; The flow conversion is performed based on the acquired flow instruction and the integrated valve position to generate the valve adjustment instruction, including: Performing flow conversion on the flow step amount and the integrated valve position through the constructed first valve control function to generate a valve regulating step amount; generating a valve regulating instruction according to the valve regulating step amount; Before performing flow conversion on the flow step amount and the integrated valve position by using the constructed first valve control function to generate the valve regulating step amount, the method further includes: Obtaining a correspondence table between flow step amounts and valve regulating step amounts, wherein the flow step amount is used to represent a change in flow rate during a transition from one steady state to another. By using the set piecewise linear function and the obtained correspondence table between the flow rate step amount and the valve regulating step amount, a first valve control function is constructed; Performing valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate includes: Performing valve conversion on the regulating valve action amount and the obtained regulating valve position through the constructed second valve control function to generate an equivalent flow rate; Before performing valve conversion on the valve regulating action amount and the acquired valve regulating position by using the constructed second valve control function to generate an equivalent flow, the method further includes: An inverse function of the first valve control function is determined as a second valve control function.

2. The method for generating equivalent flow of a steam turbine according to claim 1, characterized in that: The first valve control function constructed is used to perform flow conversion on the flow step amount and the integrated valve position to generate the valve adjustment step amount, including: Calculating the flow step amount and the integrated valve position through the first valve control function to obtain a first adjustment threshold value; Calculating the comprehensive valve position by using the first valve control function to obtain a second adjustment threshold value; A valve regulating step amount is generated according to the first threshold regulating value and the second threshold regulating value.

3. The method for generating equivalent flow of a steam turbine according to claim 1, wherein: The second valve control function constructed is used to perform valve conversion on the valve regulating action amount and the obtained valve regulating valve position to generate an equivalent flow rate, including: Calculating the regulating valve action amount and regulating valve position by using the second valve control function to obtain a first flow value; Calculating the regulating valve position by using the second valve control function to obtain a second flow value; An equivalent flow rate is generated according to the first flow rate value and the second adjusted flow rate value.

4. A steam turbine equivalent flow generating device, characterized in that: The device comprises: The flow conversion module is used to convert the flow according to the acquired flow instruction and the integrated valve position and generate the valve adjustment instruction; A valve regulating action module is used to execute the valve regulating action according to the valve regulating instruction and obtain the valve regulating action amount; A valve conversion module is used to perform valve conversion on the regulating valve action amount and the obtained regulating valve position to generate an equivalent flow rate; The flow instruction includes a flow step amount, and the valve regulating instruction includes a valve regulating step amount; The flow conversion module is specifically configured to perform flow conversion on the flow step amount and the integrated valve position by means of the constructed first valve control function to generate a valve regulating step amount; and generate a valve regulating instruction according to the valve regulating step amount; The device further comprises: an acquisition unit, configured to acquire a corresponding relationship table between flow rate step amounts and valve regulating step amounts, wherein the flow rate step amount is used to represent a change in flow rate during a transition from one steady state to another; A first construction unit is configured to construct a first valve control function according to a set piecewise linear function and an acquired correspondence table between flow rate step amounts and valve regulating step amounts; A valve conversion module is specifically used to perform valve conversion on the valve regulating amount and the obtained valve regulating position through the constructed second valve control function to generate an equivalent flow rate; The device further comprises: The second constructing unit is configured to determine an inverse function of the first valve control function as a second valve control function.

5. The steam turbine equivalent flow rate generating device according to claim 4, characterized in that: The flow conversion module is specifically used to calculate the flow step amount and the comprehensive valve position through the first valve control function to obtain the first valve adjustment value; calculate the comprehensive valve position through the first valve control function to obtain the second valve adjustment value; and generate the valve adjustment step amount according to the first valve adjustment value and the second valve adjustment value.

6. The steam turbine equivalent flow rate generating device according to claim 4, characterized in that: The valve conversion module is specifically used to calculate the valve regulating action amount and the valve regulating position through the second valve control function to obtain a first flow value; calculate the valve regulating position through the second valve control function to obtain a second flow value; and generate an equivalent flow based on the first flow value and the second regulating flow value.

7. A computer-readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for generating equivalent flow rate of a steam turbine according to any one of claims 1 to 3 is implemented.

8. A computer device comprising a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions, characterized in that: When the program instructions are loaded and executed by the processor, the method for generating equivalent flow of a steam turbine according to any one of claims 1 to 3 is implemented.

9. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the method for generating equivalent flow rate of a steam turbine according to any one of claims 1 to 3 is implemented.

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