Drum boiler model parameter determination method and apparatus for primary frequency regulation of thermal power unit

Abstract

Provided in the present invention are a drum boiler model parameter determination method and apparatus for primary frequency regulation of a thermal power unit. The method comprises: acquiring structural parameters and thermal parameters of a drum boiler in a current operating state; on the basis of a pre-constructed drum boiler model, obtaining a drum boiler steady-state model; and on the basis of the structural parameters, the thermal parameters and the drum boiler steady-state model, determining model parameters of the drum boiler model, wherein the model parameters comprise operating-state-independent parameters and operating-state-dependent parameters, and the operating-state-dependent parameters comprise a heat transfer rate from flue gas to an evaporation zone, a heat transfer rate from flue gas to a metal pipe wall in a superheat zone heat exchange unit, a pipe resistance coefficient of a superheat zone heat exchanger, parameters of the superheat zone heat exchange unit, and a valve flow coefficient. The present invention can realize online calculation of drum boiler model parameters in different operating states, and can reflect changes in the model parameters along with the operating states of the unit, thereby improving the accuracy of an online monitoring result of the primary frequency regulation capability of the thermal power unit.

Description

Method and device for determining model parameters of drum boiler for primary frequency regulation of thermal power unit Technical Field

[0001] The present invention relates to the technical field of power system and thermal system analysis, and in particular to a method and device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit. Background Art

[0002] Under the dual carbon goals, as the proportion of new energy and power electronic devices in the power system continues to increase, traditional thermal power units will gradually transform into "basic security and system regulation power sources that provide reliable capacity, peak regulation, frequency regulation and other auxiliary services" in the new power system. At the same time, as thermal power units undergo flexibility transformation, large-scale adjustment of unit output will become more frequent.

[0003] However, the primary frequency regulation capability of a thermal power unit is closely related to the unit's operating conditions, and the dynamic response characteristics of the boiler's thermal parameters vary significantly under different operating conditions. Simulating a boiler model using fixed parameters under different operating conditions will fail to accurately describe the dynamic characteristics of the boiler's thermal parameters during the primary frequency regulation period under these conditions. Existing technologies, which mostly use frequency regulation dynamic data for parameter identification, struggle to determine the boiler model's parameters in real time under current operating conditions, leading to inaccurate online monitoring of the unit's primary frequency regulation capability. Summary of the Invention

[0004] The present invention provides a method and device for determining the model parameters of a drum boiler for primary frequency regulation of a thermal power unit, which is used to overcome the defect in the prior art that the boiler model parameters under the current operating conditions cannot be determined in real time, and realizes real-time determination of the parameters of the boiler model under the current operating conditions, thereby increasing the accuracy of the online monitoring results of the primary frequency regulation capability of the thermal power unit.

[0005] The present invention provides a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit, comprising:

[0006] Obtain the structural parameters and thermal parameters of the drum boiler under the current operating conditions;

[0007] A drum boiler steady-state model is obtained according to a pre-constructed drum boiler model;

[0008] Determining model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters;

[0009] Among them, the model parameters include operating condition-independent parameters and operating condition-related parameters. The operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters and the valve flow coefficient.

[0010] According to a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention, the method determines the model parameters of the drum boiler model based on the steady-state model of the drum boiler according to the structural parameters and thermodynamic parameters, specifically comprising:

[0011] Calculating the heat transfer of flue gas to the evaporation zone and the valve flow coefficient based on the steady-state model of the drum boiler according to the thermodynamic parameters collected in steady state;

[0012] Calculating the parameters of the superheated zone heat exchange unit according to the thermal parameters;

[0013] According to the structural parameters and thermodynamic parameters, based on the steady-state model of the drum boiler, the heat transfer from the flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit are obtained through iterative calculation.

[0014] According to a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention, the method obtains the heat transfer from flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit by iterative calculation based on the structural parameters and thermodynamic parameters and the steady-state model of the drum boiler, specifically comprising:

[0015] S1: Set the iterative value of the heat transfer from the flue gas to the metal pipe wall and the resistance coefficient of the heat exchanger pipe in the superheated zone heat exchange unit;

[0016] S2: Based on the thermodynamic parameters and the connection relationship between the evaporation zone and the superheating zone in the drum boiler steady-state model, obtain the working fluid parameters at the superheating zone inlet; let the current heat exchange unit be numbered 1; wherein the working fluid parameters at the superheating zone inlet include the temperature, pressure, and flow rate of the working fluid at the superheating zone inlet;

[0017] S3: setting a qualitative temperature iteration value of the working fluid in the current heat exchange unit, calculating the working fluid temperature at the outlet of the heat exchange unit according to the physical property equation and the steady-state heat transfer equation in the drum boiler steady-state model, and obtaining a qualitative temperature calculation value;

[0018] S4: If the error between the qualitative temperature calculation value and the qualitative temperature iteration value is greater than a preset range, jump to step S3; if the error between the qualitative temperature calculation value and the qualitative temperature iteration value is less than the preset range, calculate the working fluid pressure of the next heat exchange unit according to the physical property equation and the flow equation;

[0019] S5: If the current heat exchange unit number does not reach the segment number of the current heat exchanger, the current heat exchange unit number is increased by 1, and the process jumps to step S3; if the current heat exchange unit number reaches the segment number of the current heat exchanger, it is further determined whether the current heat exchanger is a final superheater. If so, the process jumps to step S7; if not, the process jumps to step S6;

[0020] S6: Update the current stage superheater, calculate the updated temperature, pressure and flow of the steam at the inlet of the current stage superheater according to the desuperheating water characteristic equation in the drum boiler steady-state model and a predetermined thermophysical property calculation library, and jump to step S3;

[0021] S7: Compare the calculated values ​​of the working fluid pressure and temperature at the superheater outlet with the relevant measured values ​​of the thermal parameters. If the error is greater than the allowable range, jump to step S1. If the error is less than the allowable range, the heat transfer from the flue gas in the superheat zone heat exchange unit to the metal pipe wall and the heat exchanger pipe resistance coefficient are the current iterative values.

[0022] According to a method for determining parameters of a drum boiler model for primary frequency regulation of a thermal power unit provided by the present invention, the drum boiler model is constructed based on an equation describing the dynamic characteristics of the drum boiler.

[0023] According to a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention, obtaining a steady-state model of the drum boiler based on a pre-constructed drum boiler model specifically includes:

[0024] The time non-steady-state term in the drum boiler model is set to 0 to obtain the drum boiler steady-state model.

[0025] According to a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention, the drum boiler steady-state model includes an evaporation zone steady-state model, a superheat zone steady-state model and their connection relationship equations.

[0026] The present invention also provides a device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit, comprising:

[0027] An acquisition unit, used to obtain structural parameters and thermal parameters of the drum boiler under current operating conditions;

[0028] A model unit, used for obtaining a steady-state model of a drum boiler according to a pre-built drum boiler model;

[0029] a calculation unit, configured to determine model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters;

[0030] Among them, the model parameters include operating condition-independent parameters and operating condition-related parameters. The operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters and the valve flow coefficient.

[0031] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for determining the model parameters of a drum boiler for primary frequency regulation of a thermal power unit as described in any one of the above-mentioned methods is implemented.

[0032] The present invention also provides a non-transient computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit as described in any of the above.

[0033] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned methods for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit.

[0034] The present invention provides a method and device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit. The method and device obtain the structural and thermodynamic parameters of the drum boiler under current operating conditions; obtain a drum boiler steady-state model based on a pre-constructed drum boiler model; and determine model parameters of the drum boiler model based on the structural and thermodynamic parameters and the steady-state model. The model parameters include operating condition-independent parameters and operating condition-dependent parameters, wherein the operating condition-dependent parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters, and the valve flow coefficient. The method can realize online calculation of drum boiler model parameters under different operating conditions, can reflect changes in model parameters with the unit operating conditions, and is suitable for online monitoring of the primary frequency regulation capability of a thermal power unit under different operating conditions, thereby increasing the accuracy of online monitoring results of the primary frequency regulation capability of the thermal power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0036] FIG1 is a flow chart of a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention;

[0037] FIG2 is a second flow chart of a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention;

[0038] 3 is a schematic structural diagram of a device for determining model parameters of a drum boiler for a thermal power unit with primary frequency modulation provided by the present invention;

[0039] FIG4 is a schematic structural diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following describes the method for determining model parameters of a drum boiler for a thermal power unit with primary frequency modulation according to the present invention in conjunction with FIG1-FIG2 . FIG1 is a flow chart of one of the method for determining model parameters of a drum boiler for a thermal power unit with primary frequency modulation according to the present invention. As shown in FIG1 , the method includes:

[0042] Step 110: Obtain structural parameters and thermal parameters of the drum boiler under current operating conditions.

[0043] The data obtained is the structural and thermodynamic parameters of the drum boiler included in the thermal power unit whose primary frequency regulation capacity is to be monitored. It should be noted that the structural parameters are obtained from the drum boiler's boiler manual and structural design drawings, and include parameters independent of the operating conditions of the drum boiler model. The thermodynamic parameters are measured data collected based on the unit's current operating conditions, including economizer outlet feedwater temperature, economizer outlet feedwater pressure, feedwater flow, drum pressure, main steam temperature, main steam pressure, main steam flow, total valve opening, metal wall temperature at each superheater outlet, working medium temperature at each superheater inlet and outlet, desuperheating water flow at each level, and working medium temperature and pressure at the feedwater pump outlet.

[0044] The present invention does not limit the device for collecting thermal parameters, and any device can be selected during the specific implementation process. In a specific embodiment, a distributed control system (DCS) is used to collect thermal parameters.

[0045] Step 120: Obtain a steady-state model of the drum boiler according to the pre-constructed drum boiler model.

[0046] The drum boiler model referred to in the present invention is used to describe the dynamic characteristics of key thermal parameters of the boiler during a primary frequency modulation process.

[0047] The present invention divides a drum boiler into an evaporation zone and a superheat zone for modeling. The drum boiler model includes a dynamic model for the evaporation zone, a dynamic sub-model for the superheat zone, and equations linking the evaporation and superheat zones. The present invention does not restrict the specific form of the drum boiler model or its construction method; any method can be used in the actual construction process.

[0048] In some embodiments, the drum boiler model is constructed based on equations describing the dynamic characteristics of the drum boiler.

[0049] Specifically, it can be understood that the evaporation zone includes the steam drum, downcomer and water-cooled wall link, and the superheating zone includes each stage of superheaters, each stage of water spray desuperheaters and main steam regulating valve.

[0050] Dynamic characteristics include at least heat exchange characteristics, flow characteristics, desuperheating water characteristics, and valve flow characteristics. The equations describing dynamic characteristics mentioned in this embodiment are primarily used to construct a dynamic model for the superheat zone of a drum boiler. The superheat zone dynamic model consists of dynamic equations describing the superheater's heat exchange and flow characteristics, desuperheating water characteristics, and valve flow characteristics.

[0051] Each superheater stage is simplified as a tubular heat exchanger for modeling. All parallel superheater tubes are treated as a single heat exchange tube. The mass flow rate of the working fluid in this equivalent heat exchange tube and the flow area of ​​the tube are the sum of all parallel heat exchange tubes, and the tube length is the length of each parallel heat exchange tube. If the tube length is long, the tubular heat exchanger can be divided into multiple heat exchange units for analysis using a segmented approach.

[0052] During the specific implementation process, the dynamic heat flow method is used to solve the equations based on the energy conservation equation and heat transfer equation of the working fluid and metal in the superheated zone of the drum boiler, and the delay effect caused by the working fluid flow is taken into account to determine the heat transfer characteristic equation of the working fluid and metal in the superheated zone of the drum boiler; the flow characteristic equation of the steam-water working fluid in the superheated zone of the drum boiler is obtained by using the conservation of mass and momentum; the cooling water characteristic equation in the superheated zone of the drum boiler is obtained based on the conservation of mass and energy; the valve flow characteristic equation in the drum boiler is determined based on the relationship between the main steam pressure, main steam flow and the comprehensive valve opening in the superheated zone of the drum boiler; the dynamic model of the superheated zone of the drum boiler is obtained based on the valve flow characteristic equation, the cooling water characteristic equation, the flow characteristic equation and the heat transfer characteristic equation.

[0053] In a specific embodiment, the dynamic mathematical model of the superheat zone of the drum boiler is:

[0054] Where, T ci and T co are the working fluid temperatures at the inlet and outlet of the heat exchange unit respectively; T mis the metal wall temperature of the heat exchange unit; a c =k c A c / G c ; G c is the heat capacity flow of the working medium in the tube, which is defined as the product of mass flow rate and constant pressure specific heat capacity; k c A is the heat transfer coefficient between the working medium in the tube and the metal wall of the tube; c Q is the heat exchange area between the working medium in the tube and the metal wall of the tube in the heat exchange unit; gm is the heat transfer from the flue gas to the metal pipe wall in the heat exchange unit. Assuming that Q gm Remain unchanged; R c is the heat transfer resistance between the working fluid in the heat exchange unit tube and the tube wall metal, τ c =R c C m , is the time constant of the heat exchange unit during the heat exchange process, C m is the heat capacity of the tube wall metal in the heat exchange unit; T m0 is the initial wall temperature of the heat exchange unit; t represents time; Δt = l / w, l is the length of the heat exchange unit, w is the flow rate of the working medium in the tube; F c is the flow area of ​​the heat exchanger pipe; ρ c is the density of the working fluid in the heat exchange unit; p ci and p co are the pressures of the working fluid at the inlet and outlet of the heat exchange unit respectively; D ci and D co are the mass flow rates of the working fluid at the inlet and outlet of the heat exchange unit respectively; f sh D is the resistance coefficient of the heat exchanger pipe in the superheated zone; sa，o and h sa,o are the mass flow rate and specific enthalpy of the steam at the desuperheater outlet; D sa，i and h sa，i are the mass flow rate and specific enthalpy of the steam at the desuperheater inlet; D sw is the mass flow rate of cooling water at each level; h sw is the specific enthalpy of desuperheated water; p st and D st are main steam pressure and main steam flow respectively; cv is the total valve opening; kv is the valve flow coefficient.

[0055] Furthermore, a dynamic model of the drum boiler evaporation zone is constructed. This embodiment does not specifically limit the construction method of the dynamic model of the drum boiler evaporation zone. In a specific embodiment, the dynamic mathematical model of the drum boiler evaporation zone is:

[0056] In the formula

[0057] Where V, ρ, and h represent the volume, density, and specific enthalpy of the working fluid, respectively; subscripts f and g represent saturated water and saturated steam, respectively; D fw and D g are the feed water flow rate from the economizer outlet to the drum and the saturated steam flow rate from the drum outlet; p s is the pressure of the working fluid in the evaporation zone; V e is the volume of the evaporation zone; k tp =dT s / qd s , T S is the metal wall temperature, which is equal to the saturation temperature of the working fluid. During a frequency modulation period, the pressure and the corresponding saturation temperature are approximately linearly related. Therefore, it is assumed that k tp is a constant; k me is the effective metal coefficient of the boiler evaporation zone; c me is the specific heat capacity of the metal; M me is the mass of the metal; Q ge is the heat transfer from flue gas to the evaporation zone, assuming that Q ge Remain unchanged; h we is the specific enthalpy of feed water at the economizer outlet; t represents time.

[0058] Based on the above embodiment, the connection relationship between the dynamic models of the evaporation zone and the superheating zone of the drum boiler is:

[0059] Where, T sh，i 、p sh,i and D sh,i are the temperature, pressure and mass flow rate of the steam at the superheated zone inlet respectively; f sh is the resistance coefficient of the pipe in the superheated zone.

[0060] The drum boiler model is obtained according to the pre-constructed dynamic model of the evaporation zone of the drum boiler, the dynamic sub-model of the superheat zone of the drum boiler and the connection relationship equation between the evaporation zone and the superheat zone.

[0061] Furthermore, after obtaining the drum boiler model, obtaining a drum boiler steady-state model based on the pre-constructed drum boiler model specifically includes:

[0062] The time non-steady-state term in the drum boiler model is set to 0 to obtain the drum boiler steady-state model.

[0063] Specifically, the drum boiler steady-state model is obtained by setting the time non-steady-state term of the drum boiler model to 0.

[0064] Based on the above embodiment, when the drum boiler model includes the dynamic model of the evaporation zone of the drum boiler, the dynamic sub-model of the superheat zone of the drum boiler, and the connection relationship equation between the evaporation zone and the superheat zone, the drum boiler steady-state model includes the steady-state model of the evaporation zone, the steady-state model of the superheat zone and their connection relationship equations.

[0065] Specifically, the specific form of the drum boiler steady-state model is as follows:

[0066] The steady-state model of the evaporation zone is:

[0067] Where D fw and D g are the feed water flow rate from the economizer outlet to the drum and the saturated steam flow rate from the drum outlet; Q ge is the heat transfer from flue gas to the evaporation zone, assuming that Q ge Remain unchanged; h we is the specific enthalpy of feed water at the economizer outlet; h g is the specific enthalpy of saturated steam.

[0068] The steady-state model of the superheated zone is:

[0069] Where, T ci and T co are the working fluid temperatures at the inlet and outlet of the heat exchange unit respectively; T m is the metal wall temperature of the heat exchange unit; a c =k c A c / G c ; G c is the heat capacity flow of the working medium in the tube, which is defined as the product of mass flow rate and constant pressure specific heat capacity; k c A is the heat transfer coefficient between the working medium in the tube and the metal wall of the tube; c Q is the heat exchange area between the working medium in the tube and the metal wall of the tube in the heat exchange unit; gm is the heat transfer from the flue gas to the metal pipe wall in the heat exchange unit. Assuming that Q gm Remain unchanged; R c is the heat transfer resistance between the working fluid in the heat exchange unit tube and the tube wall metal, D ci and D co are the mass flow rates of the working fluid at the inlet and outlet of the heat exchange unit respectively; p ci and p co are the pressures of the working fluid at the inlet and outlet of the heat exchange unit respectively; f sh is the resistance coefficient of the heat exchanger pipe in the superheated zone; ρ c is the density of the working fluid in the heat exchange unit; D sa，o and h sa，oare the mass flow rate and specific enthalpy of the steam at the desuperheater outlet; D sa，i and h sa,i are the mass flow rate and specific enthalpy of the steam at the desuperheater inlet; D sw is the mass flow rate of cooling water at each level; h sw is the specific enthalpy of desuperheated water; p st and D st are main steam pressure and main steam flow respectively; cv is the total valve opening; kv is the valve flow coefficient.

[0070] The connection relationship between the evaporation zone and the superheating zone is:

[0071] Where, T sh，i 、p sh，i and D sh，i are the temperature, pressure and mass flow rate of the steam at the superheated zone inlet respectively; p s 、T S and D g are the working fluid pressure in the evaporation zone, the saturation temperature corresponding to the pressure, and the mass flow rate of saturated steam at the drum outlet; f sh is the resistance coefficient of the pipe in the superheated zone; ρ g is the density of saturated steam.

[0072] The steady-state models of the evaporation zone and superheating zone and their connection equations constitute the steady-state model of the drum boiler.

[0073] Step 130: Determine the model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters.

[0074] It should be noted that the operating condition-independent parameters in the drum boiler model mainly include: the volume of the evaporation zone, the effective metal heat capacity of the evaporation zone, the heat capacity of the tube wall metal in the heat exchange unit in the superheat zone, the length and flow area of ​​each heat exchanger in the superheat zone, etc.

[0075] The working condition related parameters mainly include: the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the resistance coefficient of the superheat zone heat exchanger pipe, the superheat zone heat exchange unit parameters and the valve flow coefficient.

[0076] During the specific implementation process, the specific values ​​of the operating condition-independent parameters in the boiler model can be determined based on the structural parameters; based on the thermal parameters collected under the current operating conditions, the specific values ​​of the operating condition-related parameters in the model can be calculated online according to the steady-state model of the drum boiler.

[0077] It should be emphasized that the operating condition-independent parameters have fixed values ​​under different operating conditions, while the operating condition-dependent parameters change with the changes in the unit's operating conditions and have different values ​​under different conditions.

[0078] Furthermore, in some embodiments, determining the model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters specifically includes:

[0079] Calculating the heat transfer of flue gas to the evaporation zone and the valve flow coefficient based on the steady-state model of the drum boiler according to the thermodynamic parameters collected in steady state;

[0080] Calculating the parameters of the superheated zone heat exchange unit according to the thermal parameters;

[0081] According to the structural parameters and thermodynamic parameters, based on the steady-state model of the drum boiler, the heat transfer from the flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit are obtained through iterative calculation.

[0082] Specifically, the heat transfer of flue gas to the evaporation zone and the valve flow coefficient can be calculated based on the thermodynamic parameters collected in steady state through the steady-state model of the drum boiler. The specific equations include the following:

[0083] Among them, D fw and D g are the feed water flow rate from the economizer outlet to the drum and the saturated steam flow rate from the drum outlet; Q ge is the heat transfer from flue gas to the evaporation zone, assuming that Q ge Remain unchanged; h we is the specific enthalpy of feed water at the economizer outlet; h g is the specific enthalpy of saturated steam; p st and D st are main steam pressure and main steam flow respectively; cv is the total valve opening; kv is the valve flow coefficient.

[0084] For the superheating zone heat exchange unit parameter a c Since the working fluid temperature and wall temperature parameters in the collected thermal parameters are limited, it is assumed that the parameters of the heat exchange unit in each stage of superheater are equal. The parameter value of each stage of superheater can be calculated by the following formula:

[0085] Where, Q is the heat transfer capacity; T c，in and T c，out are the temperatures of the working fluid at the inlet and outlet of the superheater respectively; ΔT is the logarithmic mean temperature difference; T m，in and T m，out are the temperatures of the tube wall metal at the inlet and outlet of the superheater, respectively. After determining the overall superheater parameter value, divide it by the number of heat exchanger sections to determine the parameter value of each heat exchange unit.

[0086] The heat transfer amount of flue gas to the metal tube wall in the heat exchange unit in the superheat zone and the resistance coefficient of the heat exchanger tube can be calculated through iteration based on the steady-state model.

[0087] In some embodiments, the heat transfer from the flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit are obtained by iterative calculation based on the structural parameters and thermodynamic parameters and the steady-state model of the drum boiler, specifically including:

[0088] S1: Set the iterative value of the heat transfer from the flue gas to the metal pipe wall and the resistance coefficient of the heat exchanger pipe in the superheated zone heat exchange unit;

[0089] S2: Based on the thermodynamic parameters and the connection relationship between the evaporation zone and the superheating zone in the drum boiler steady-state model, obtain the working fluid parameters at the superheating zone inlet; let the current heat exchange unit be numbered 1; wherein the working fluid parameters at the superheating zone inlet include the temperature, pressure, and flow rate of the working fluid at the superheating zone inlet;

[0090] S3: setting a qualitative temperature iteration value of the working fluid in the current heat exchange unit, calculating the working fluid temperature at the outlet of the heat exchange unit according to the physical property equation and the steady-state heat transfer equation in the drum boiler steady-state model, and obtaining a qualitative temperature calculation value;

[0091] S4: If the error between the qualitative temperature calculation value and the qualitative temperature iteration value is greater than a preset range, jump to step S3; if the error between the qualitative temperature calculation value and the qualitative temperature iteration value is less than the preset range, calculate the working fluid pressure of the next heat exchange unit according to the physical property equation and the flow equation;

[0092] S5: If the current heat exchange unit number does not reach the segment number of the current heat exchanger, the current heat exchange unit number is increased by 1, and the process jumps to step S3; if the current heat exchange unit number reaches the segment number of the current heat exchanger, it is further determined whether the current heat exchanger is a final superheater. If so, the process jumps to step S7; if not, the process jumps to step S6;

[0093] S6: Update the current stage superheater, calculate the updated temperature, pressure and flow of the steam at the inlet of the current stage superheater according to the desuperheating water characteristic equation in the drum boiler steady-state model and a predetermined thermophysical property calculation library, and jump to step S3;

[0094] S7: Compare the calculated values ​​of the working fluid pressure and temperature at the superheater outlet with the relevant measured values ​​of the thermal parameters. If the error is greater than the allowable range, jump to step S1. If the error is less than the allowable range, the heat transfer from the flue gas in the superheat zone heat exchange unit to the metal pipe wall and the heat exchanger pipe resistance coefficient are the current iterative values.

[0095] Specifically, as shown in Figure 2, in step S1, iterative values ​​are set for the heat transfer from flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient within the superheat zone heat exchange unit. The iterative values ​​are arbitrarily set with the goal of achieving iterative convergence. To further accelerate the iteration process, the iterative values ​​can be arbitrarily set within a preset range. This range is set based on the characteristics of the current drum boiler and can be obtained through testing during actual operation.

[0096] Then, step S2 is executed, that is, the temperature, pressure and flow rate of the working medium at the inlet of the superheating zone are obtained based on the collected thermal data and the connection relationship between the evaporation zone and the superheating zone.

[0097] In one embodiment, the connection relationship between the evaporation zone and the superheating zone includes:

[0098] Where, T sh，i 、p sh，i and D sh，i are the temperature, pressure and mass flow rate of the steam at the superheated zone inlet respectively; p s 、T S and D g are the working fluid pressure in the evaporation zone, the saturation temperature corresponding to the pressure, and the mass flow rate of saturated steam at the drum outlet; f sh is the resistance coefficient of the pipe in the superheated zone; ρ g is the density of saturated steam.

[0099] By inputting the collected thermal data, the temperature, pressure and flow rate of the working fluid at the inlet of the superheated zone can be obtained.

[0100] At the same time, in order to make the iteration clearer, the current heat exchange unit is numbered 1.

[0101] In step S3, the iteration value of the qualitative temperature of the working fluid within the current heat exchange unit is set. It is understood that the qualitative temperature refers to the arithmetic mean of the inlet and outlet temperatures. The iteration value is arbitrarily set with the goal of iterative convergence. To further accelerate the iteration process, the iteration value can be arbitrarily set within a preset range. The preset range is set based on the characteristics of the current drum boiler and can be obtained through testing during actual operation.

[0102] Furthermore, the outlet temperature of the working fluid in the heat exchange unit is calculated based on the steady-state model of the drum boiler, and the calculated value of the qualitative temperature is obtained. It is important to understand that before this calculation, the remaining physical properties of the working fluid in the heat exchange unit must be determined. Specifically, based on the qualitative temperature and pressure of the working fluid, the remaining physical properties of the working fluid in the heat exchange unit can be obtained using a pre-defined thermophysical property calculation library.

[0103] In some embodiments, the predetermined thermophysical property calculation library is the CoolProp thermophysical property calculation library.

[0104] In some embodiments, when calculating the working medium temperature at the outlet of the heat exchange unit according to the steady-state model of the drum boiler and obtaining the calculated value of the qualitative temperature, the following equation of the steady-state model of the drum boiler is used:

[0105] Where, T ci and T co are the working fluid temperatures at the inlet and outlet of the heat exchange unit respectively; T m is the metal wall temperature of the heat exchange unit; a c =k c A c / G c , is the heat exchange unit parameter of the superheating zone; G c is the heat capacity flow of the working medium in the tube, which is defined as the product of mass flow rate and constant pressure specific heat capacity; k c A is the heat transfer coefficient between the working medium in the tube and the metal wall of the tube; c Q is the heat exchange area between the working medium in the tube and the metal wall of the tube in the heat exchange unit; gm is the heat transfer from the flue gas to the metal pipe wall in the heat exchange unit. Assuming that Q gm Remains unchanged; R. is the heat transfer resistance between the working fluid in the heat exchange unit tube and the tube wall metal,

[0106] Then, in step S4, the set value of the qualitative temperature is compared with the calculated value. If the error is greater than the allowable range, the process proceeds to step S3. If the error is less than the allowable range, the working pressure of the next heat exchange unit is calculated based on the drum boiler steady-state model.

[0107] In some embodiments, when calculating the working medium pressure at the outlet of the heat exchange unit according to the steady-state model of the drum boiler, the following equation of the steady-state model of the drum boiler is used:

[0108] Where p ci and p co are the pressures of the working fluid at the inlet and outlet of the heat exchange unit respectively; D co is the mass flow rate of the working fluid at the outlet of the heat exchange unit; f sh is the resistance coefficient of the heat exchanger pipe in the superheat zone.

[0109] In step S5, a determination is made as to whether the current heat exchange unit number reaches the number of segments of the current heat exchanger. If not, the current heat exchange unit number is incremented by 1, and the process proceeds to step S3. If it reaches the number of segments of the current heat exchanger, a further determination is made as to whether the current heat exchanger is the final superheater. If so, the process proceeds to step S7; if not, the process proceeds to step S6.

[0110] In step S6, the temperature, pressure, and flow rate of the steam at the inlet of the next-stage superheater are calculated based on the desuperheating water characteristic equation in the drum boiler steady-state model and a predetermined thermophysical property calculation library. The process then proceeds to step S3 to calculate the thermodynamic state parameters of each heat exchange unit in the next-stage superheater. The desuperheating water characteristic equation includes:

[0111] Where D sa,o and h sa,o are the mass flow rate and specific enthalpy of the steam at the desuperheater outlet; D sa,i and h sa，i are the mass flow rate and specific enthalpy of the steam at the desuperheater inlet; D sw is the mass flow rate of cooling water at each level; h sw is the specific enthalpy of desuperheated water.

[0112] In step S7, after obtaining the thermal parameters for each heat exchange unit in each superheater stage, the calculated values ​​of the working fluid pressure and temperature at the superheater outlet are compared with the measured values ​​of the thermal parameters. If the error is greater than the allowable range, the process proceeds to step S1 and the iterative value is re-set. If the error is less than the allowable range, the heat transfer rate of the flue gas to the metal pipe wall in the superheat zone heat exchange unit and the resistance coefficient of the heat exchanger pipe are obtained, which are the currently set iterative values.

[0113] The present invention provides a method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit. The method comprises obtaining structural parameters and thermodynamic parameters of the drum boiler under current operating conditions; obtaining a drum boiler steady-state model based on a pre-constructed drum boiler model; and determining model parameters of the drum boiler model based on the structural parameters and thermodynamic parameters and the steady-state model. The model parameters include operating condition-independent parameters and operating condition-dependent parameters, wherein the operating condition-dependent parameters include heat transfer of flue gas to the evaporation zone, heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, superheat zone heat exchanger pipe resistance coefficient, superheat zone heat exchange unit parameters, and valve flow coefficient. The method can realize online calculation of drum boiler model parameters under different operating conditions, can reflect changes in model parameters with the unit operating conditions, and is suitable for online monitoring of the primary frequency regulation capability of a thermal power unit under different operating conditions, thereby increasing the accuracy of online monitoring results of the primary frequency regulation capability of the thermal power unit.

[0114] The following describes the device for determining model parameters of a drum boiler for a thermal power unit with primary frequency regulation provided by the present invention. The device for determining model parameters of a drum boiler for a thermal power unit with primary frequency regulation described below can be used in conjunction with the method for determining model parameters of a drum boiler for a thermal power unit with primary frequency regulation described above. FIG3 is a schematic structural diagram of the device for determining model parameters of a drum boiler for a thermal power unit with primary frequency regulation provided by the present invention. As shown in FIG3 , the device includes:

[0115] An acquisition unit 310 is used to acquire structural parameters and thermal parameters of the drum boiler under current operating conditions;

[0116] A model unit 320 is configured to obtain a drum boiler steady-state model based on a pre-built drum boiler model;

[0117] a calculation unit 330 for determining model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters;

[0118] Among them, the model parameters include operating condition-independent parameters and operating condition-related parameters. The operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters and the valve flow coefficient.

[0119] According to a device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention, the device determines the model parameters of the drum boiler model based on the steady-state model of the drum boiler according to the structural parameters and the thermodynamic parameters, specifically comprising:

[0120] Calculating the heat transfer of flue gas to the evaporation zone and the valve flow coefficient based on the steady-state model of the drum boiler according to the thermodynamic parameters collected in steady state;

[0121] Calculating the parameters of the superheated zone heat exchange unit according to the thermal parameters;

[0122] According to the structural parameters and thermodynamic parameters, based on the steady-state model of the drum boiler, the heat transfer from the flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit are obtained through iterative calculation.

[0123] According to the present invention, a device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit is provided. The device obtains the heat transfer from flue gas to the metal pipe wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit by iterative calculation based on the structural parameters and thermodynamic parameters and the steady-state model of the drum boiler. Specifically, the device comprises:

[0124] S1: Set the iterative value of the heat transfer from the flue gas to the metal pipe wall and the resistance coefficient of the heat exchanger pipe in the superheated zone heat exchange unit;

[0125] S2: Based on the thermodynamic parameters and the connection relationship between the evaporation zone and the superheating zone in the drum boiler steady-state model, obtain the working fluid parameters at the superheating zone inlet; let the current heat exchange unit be numbered 1; wherein the working fluid parameters at the superheating zone inlet include the temperature, pressure, and flow rate of the working fluid at the superheating zone inlet;

[0126] S3: setting a qualitative temperature iteration value of the working fluid in the current heat exchange unit, calculating the working fluid temperature at the outlet of the heat exchange unit according to the physical property equation and the steady-state heat transfer equation in the drum boiler steady-state model, and obtaining a qualitative temperature calculation value;

[0127] S4: If the error between the qualitative temperature calculation value and the qualitative temperature iteration value is greater than a preset range, jump to step S3; if the error between the qualitative temperature calculation value and the qualitative temperature iteration value is less than the preset range, calculate the working fluid pressure of the next heat exchange unit according to the physical property equation and the flow equation;

[0128] S5: If the current heat exchange unit number does not reach the segment number of the current heat exchanger, the current heat exchange unit number is increased by 1, and the process jumps to step S3; if the current heat exchange unit number reaches the segment number of the current heat exchanger, it is further determined whether the current heat exchanger is a final superheater. If so, the process jumps to step S7; if not, the process jumps to step S6;

[0129] S6: Update the current stage superheater, calculate the updated temperature, pressure and flow of the steam at the inlet of the current stage superheater according to the desuperheating water characteristic equation in the drum boiler steady-state model and a predetermined thermophysical property calculation library, and jump to step S3;

[0130] S7: Compare the calculated values ​​of the working fluid pressure and temperature at the superheater outlet with the relevant measured values ​​of the thermal parameters. If the error is greater than the allowable range, jump to step S1. If the error is less than the allowable range, the heat transfer from the flue gas in the superheat zone heat exchange unit to the metal pipe wall and the heat exchanger pipe resistance coefficient are the current iterative values.

[0131] According to a device for determining parameters of a drum boiler model for primary frequency regulation of a thermal power unit provided by the present invention, the drum boiler model is constructed based on an equation describing the dynamic characteristics of the drum boiler.

[0132] According to a device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the present invention, the method of obtaining a steady-state model of the drum boiler based on a pre-constructed drum boiler model specifically includes:

[0133] The time non-steady-state term in the drum boiler model is set to 0 to obtain the drum boiler steady-state model.

[0134] According to the present invention, a device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit is provided. The drum boiler steady-state model includes an evaporation zone steady-state model, a superheat zone steady-state model and their connection relationship equations.

[0135] The present invention provides a device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit. The device obtains structural and thermodynamic parameters of the drum boiler under current operating conditions; obtains a drum boiler steady-state model based on a pre-constructed drum boiler model; and determines model parameters of the drum boiler model based on the structural and thermodynamic parameters and the steady-state model. The model parameters include operating condition-independent parameters and operating condition-dependent parameters, wherein the operating condition-dependent parameters include heat transfer of flue gas to the evaporation zone, heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, superheat zone heat exchanger pipe resistance coefficient, superheat zone heat exchange unit parameters, and valve flow coefficient. The device can realize online calculation of drum boiler model parameters under different operating conditions, can reflect changes in model parameters with the unit's operating conditions, and is suitable for online monitoring of the primary frequency regulation capability of a thermal power unit under different operating conditions, thereby increasing the accuracy of online monitoring results of the primary frequency regulation capability of the thermal power unit.

[0136] FIG4 illustrates a schematic diagram of the physical structure of an electronic device. As shown in FIG4 , the electronic device may include: a processor (processor) 410, a communications interface (Communications Interface) 420, a memory (memory) 430 and a communication bus 440, wherein the processor 410, the communications interface 420, and the memory 430 communicate with each other via the communication bus 440. The processor 410 can call the logic instructions in the memory 430 to execute a method for determining the model parameters of a drum boiler for primary frequency regulation of a thermal power unit, the method including: obtaining the structural parameters and thermodynamic parameters of the drum boiler under the current operating conditions; obtaining a steady-state model of the drum boiler based on a pre-constructed drum boiler model; determining the model parameters of the drum boiler model based on the steady-state model of the drum boiler according to the structural parameters and thermodynamic parameters; wherein the model parameters include operating condition-independent parameters and operating condition-related parameters, and the operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters and the valve flow coefficient.

[0137] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0138] On the other hand, the present invention also provides a computer program product, which includes a computer program, and the computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the method for determining the model parameters of a drum boiler for primary frequency regulation of a thermal power unit provided by the above methods, the method including: obtaining the structural parameters and thermodynamic parameters of the drum boiler under the current operating conditions; obtaining a steady-state model of the drum boiler based on a pre-constructed drum boiler model; determining the model parameters of the drum boiler model based on the steady-state model of the drum boiler according to the structural parameters and thermodynamic parameters; wherein the model parameters include operating condition-independent parameters and operating condition-related parameters, and the operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the pipe resistance coefficient of the superheat zone heat exchanger, the parameters of the superheat zone heat exchange unit, and the valve flow coefficient.

[0139] On the other hand, the present invention also provides a non-transient computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for determining model parameters of a drum boiler for primary frequency modulation of a thermal power unit provided by the above-mentioned methods, the method comprising: obtaining structural parameters and thermodynamic parameters of the drum boiler under current operating conditions; obtaining a steady-state model of the drum boiler based on a pre-constructed drum boiler model; determining model parameters of the drum boiler model based on the steady-state model of the drum boiler according to the structural parameters and thermodynamic parameters; wherein the model parameters include operating condition-independent parameters and operating condition-related parameters, and the operating condition-related parameters include heat transfer of flue gas to the evaporation zone, heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, pipe resistance coefficient of the superheat zone heat exchanger, parameters of the superheat zone heat exchange unit, and valve flow coefficient.

[0140] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0141] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit, characterized in that: include: Obtain the structural parameters and thermal parameters of the drum boiler under the current operating conditions; A drum boiler steady-state model is obtained according to a pre-constructed drum boiler model; Determining model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters; Among them, the model parameters include operating condition-independent parameters and operating condition-related parameters. The operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters and the valve flow coefficient.

2. The method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit according to claim 1, characterized in that: Determining the model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters specifically includes: Calculating the heat transfer of flue gas to the evaporation zone and the valve flow coefficient based on the steady-state model of the drum boiler according to the thermodynamic parameters collected in steady state; Calculating the parameters of the superheated zone heat exchange unit according to the thermal parameters; According to the structural parameters and thermodynamic parameters, based on the steady-state model of the drum boiler, the heat transfer amount of the flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit are obtained through iterative calculation.

3. The method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit according to claim 2, characterized in that: The heat transfer from the flue gas to the metal tube wall and the heat exchanger pipe resistance coefficient in the superheated zone heat exchange unit are obtained by iterative calculation based on the structural parameters and thermodynamic parameters and the steady-state model of the drum boiler, specifically including: S1: Set the iterative value of the heat transfer from the flue gas to the metal pipe wall and the resistance coefficient of the heat exchanger pipe in the superheated zone heat exchange unit; S2: Based on the thermodynamic parameters, combined with the evaporation zone in the drum boiler steady-state model The connection relationship with the superheating zone is used to obtain the working fluid parameters at the superheating zone entrance; let the current heat exchange unit be numbered 1; wherein the working fluid parameters at the superheating zone entrance include the temperature, pressure and flow rate of the working fluid at the superheating zone entrance; S3: setting a qualitative temperature iteration value of the working fluid in the current heat exchange unit, calculating the working fluid temperature at the outlet of the heat exchange unit according to the physical property equation and the steady-state heat transfer equation in the drum boiler steady-state model, and obtaining a qualitative temperature calculation value; S4: If the error between the qualitative temperature calculation value and the qualitative temperature iteration value is greater than a preset range, jump to step S3; if the error between the qualitative temperature calculation value and the qualitative temperature iteration value is less than the preset range, calculate the working fluid pressure of the next heat exchange unit according to the physical property equation and the flow equation; S5: If the current heat exchange unit number does not reach the segment number of the current heat exchanger, the current heat exchange unit number is increased by 1, and the process jumps to step S3; if the current heat exchange unit number reaches the segment number of the current heat exchanger, it is further determined whether the current heat exchanger is a final superheater. If so, the process jumps to step S7; if not, the process jumps to step S6; S6: Update the current stage superheater, calculate the updated temperature, pressure and flow of the steam at the inlet of the current stage superheater according to the desuperheating water characteristic equation in the drum boiler steady-state model and a predetermined thermophysical property calculation library, and jump to step S3; S7: Compare the calculated values ​​of the working fluid pressure and temperature at the superheater outlet with the relevant measured values ​​of the thermal parameters. If the error is greater than the allowable range, jump to step S1. If the error is less than the allowable range, the heat transfer from the flue gas in the superheat zone heat exchange unit to the metal pipe wall and the heat exchanger pipe resistance coefficient are the current iterative values.

4. The method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit according to claim 1, characterized in that: The drum boiler model is constructed based on equations describing the dynamic characteristics of the drum boiler.

5. The method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit according to claim 1, characterized in that: The step of obtaining a drum boiler steady-state model based on the pre-constructed drum boiler model specifically includes: The time non-steady-state term in the drum boiler model is set to 0 to obtain the drum boiler steady-state model.

6. The method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit according to claim 1, characterized in that: The drum boiler steady-state model includes an evaporation zone steady-state model, a superheat zone steady-state model and their connection relationship equations.

7. A device for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit, characterized in that: include: An acquisition unit, used to obtain structural parameters and thermal parameters of the drum boiler under current operating conditions; A model unit, used for obtaining a steady-state model of a drum boiler according to a pre-built drum boiler model; a calculation unit, configured to determine model parameters of the drum boiler model based on the drum boiler steady-state model according to the structural parameters and the thermodynamic parameters; Among them, the model parameters include operating condition-independent parameters and operating condition-related parameters. The operating condition-related parameters include the heat transfer of flue gas to the evaporation zone, the heat transfer of flue gas to the metal pipe wall in the superheat zone heat exchange unit, the superheat zone heat exchanger pipe resistance coefficient, the superheat zone heat exchange unit parameters and the valve flow coefficient.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for determining the model parameters of the drum boiler for primary frequency regulation of a thermal power unit as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit as claimed in any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for determining model parameters of a drum boiler for primary frequency regulation of a thermal power unit as claimed in any one of claims 1 to 6 is implemented.

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