Thermal power generating unit APS automatic start-stop full-process control method and system

Abstract

The invention relates to the field of electric power, discloses a thermal power generating unit APS automatic start-stop full-process control method and system, and is used for solving the contradiction among safety, economy and rapidity of a traditional APS system. The method comprises the steps of establishing a differential algebraic equation system based on unit physical parameters to generate a unified model constraint set; generating a reference trajectory representing energy conversion efficiency and power in a differential flat space according to the start-stop target curve; predicting a thermal stress change rate through a fractional order differential operator based on the metal temperature to generate a safety margin instruction; generating an energy coordination correction instruction according to the Hamiltonian energy network balance point of the boiler heat storage and steam turbine kinetic energy solving port; and mapping the reference trajectory into a control instruction, integrating thermal stress constraint and energy coordination correction, and then distributing and executing. Safe and efficient start-stop control under full-process physical constraints is achieved, start-stop safety and economy are improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of power, and in particular to a method and system for the full-process control of automatic start-stop of thermal power units using an APS (Automatic Start-Stop) system. Background Technology

[0002] As the backbone of power grid peak shaving, the automated start-up and shutdown system of thermal power generating units is a core indicator of the power plant's intelligence level. Its start-up and shutdown process is a complex dynamic process involving multiple strongly coupled layers of boiler-turbine-auxiliary equipment, exhibiting high inertia and nonlinear characteristics. Existing technologies have the following shortcomings: Existing technologies typically treat boilers, steam turbines, and generators as independent entities in control design, or use highly simplified linear models. This ignores the inherent physical coupling between them. As a result, control commands for each subsystem conflict, creating a "tug-of-war," leading to oscillations or lags, and failing to achieve globally optimal smooth start-up and shutdown.

[0003] Current limitations on boiler heating rates are primarily based on empirical values ​​or simple temperature difference calculations, employing fixed upper limits that fail to predict the changing trends of thermal stress in critical components. This approach neither allows for the exploitation of accelerated start-up and shutdown potential under safe conditions nor provides dynamic protection during changes in operating conditions.

[0004] Control commands on the boiler side and the turbine side are often generated separately, lacking a unified energy perspective for real-time coordination. This can lead to energy accumulation or shortage, causing fluctuations in key parameters such as main steam pressure and temperature, and disrupting the stability of the start-up and shutdown process.

[0005] Therefore, we propose a full-process control method and system medium for the automatic start-stop of thermal power units using APS to solve the above problems. Summary of the Invention

[0006] This invention provides a method and system for the full-process control of automatic start-stop of thermal power units using APS, which is used to resolve the contradiction between safety, economy and speed in traditional APS systems.

[0007] The first aspect of this invention provides a full-process control method for automatic start-stop of thermal power units using an APS (Automatic Start-Stop) system. This method includes: establishing a differential algebraic equation system based on the unit's physical parameters to generate a unified model constraint set; generating a dimensionless reference trajectory in a differential flat space based on the start-stop target curve and the unified model constraint set, where the trajectory characterizes the normalized evolution path of the unit's energy conversion efficiency and power; predicting the rate of change of thermal stress using fractional differential operators based on real-time metal temperature and the dimensionless reference trajectory, generating a thermal stress safety margin command that dynamically limits the boiler's heating rate; solving for the dynamic equilibrium point of the port Hamiltonian energy network based on the boiler's thermal storage state, turbine kinetic energy, and the dimensionless reference trajectory, generating an energy coordination correction command; mapping the dimensionless reference trajectory to control quantity base commands, using the thermal stress safety margin command to constrain boiler operating quantities, and using the energy coordination correction command to adjust turbine operating quantities, forming commands and distributing them to the actuators.

[0008] Optionally, in the first implementation of the first aspect of the present invention, differential equations are established based on the principles of boiler combustion dynamics and turbine rotor kinematics to generate a dynamic state variable set; based on flow characteristics and generator synchronization conditions, the flow equation is transformed into an algebraic relationship to generate an algebraic constraint set; based on the properties of metallic materials and rotor vibration limits, a state space safety boundary is constructed to generate a dimensionless safety envelope; based on the dynamic state variable set and the algebraic constraint set, the correlation rules between the boiler pressure change rate and the turbine speed acceleration are derived to generate a dynamic coupling constraint chain; and the dynamic state variable set, the algebraic constraint set, the dimensionless safety envelope, and the dynamic coupling constraint chain are integrated to construct a unified model constraint set.

[0009] Optionally, in the second implementation of the first aspect of the present invention, a dimensionless time coordinate axis is generated based on the target total start-up and shutdown duration to establish a time reference; normalized unit power and thermal efficiency are selected as flat output components to form a two-dimensional flat state vector; based on the safety envelope and dynamic coupling chain of the unified model constraint set, the endpoint derivative constraints of the flat spatial trajectory are derived to generate a set of boundary condition equations; the set of boundary condition equations is embedded into a fifth-order general solution structure to calculate the polynomial coefficient matrix that satisfies the endpoint constraints; and a continuous differentiable reference trajectory of unit power and thermal efficiency is generated through the coefficient matrix and the time reference.

[0010] Optionally, in the third implementation of the first aspect of the present invention, a dimensionless temperature difference is calculated based on real-time data from boiler drum wall temperature measuring points to generate a normalized temperature gradient field; a fractional-order differential kernel is established based on the thermal inertia parameters of the metallic material to generate a non-integer-order differential operator; the normalized temperature gradient field is input into the non-integer-order differential operator to calculate the thermal stress change trend and generate a predicted stress change rate; the upper limit of the boiler heating rate is calculated based on the ratio of the material fatigue limit to the predicted stress change rate to generate a dynamic safety margin threshold; the dynamic safety margin threshold is converted into a fuel quantity limit command to generate a thermal stress safety margin command and output to the system.

[0011] Optionally, in the fourth implementation of the first aspect of the present invention, the boiler heat storage and turbine kinetic energy are converted into Hamiltonian function components to generate an energy flow state vector; based on the normalized ratio of boiler fuel input power to turbine output power, port interconnection variables are constructed; according to the port Hamiltonian structure theorem, the energy flow state vector and port interconnection variables are combined to form an energy network equation; using the thermal efficiency component of the dimensionless reference trajectory as the objective function, the operating point of the energy network equation is solved to generate a dynamic energy balance point; the deviation between the dynamic energy balance point and the current actual energy flow is calculated and mapped to the turbine valve opening compensation amount to generate an energy coordination correction command.

[0012] Optionally, in the fifth implementation of the first aspect of the present invention, the dimensionless reference trajectory is analyzed into command base value and opening base value through differential flattening inverse transform to generate a dual-loop base command; the rate of change of the fuel command base value is processed by the thermal stress safety margin command to generate a fuel command; the energy coordination correction command is superimposed on the opening base value to compensate for energy flow deviation and generate a turbine command; the control commands are classified according to the boiler combustion response time constant and the turbine rotor mechanical inertia to generate a time-domain decoupled command set; the commands are converted into actual engineering units and distributed to the actuators according to different cycles to generate executable control signals.

[0013] Optionally, in the sixth implementation of the first aspect of the present invention, before instruction distribution, a pre-verification pass flag is generated based on the control instructions of the unified model constraint set; the normalized deviation between the feedback signal of the actuator and the instruction is collected, and a threshold is calculated according to the equipment response characteristics to generate a dynamic tolerance threshold; when the deviation continues to exceed the dynamic tolerance threshold, a fault mode switching instruction is generated based on the safety library to switch to the degraded control mode; the instantaneous ratio of the boiler input heat to the turbine output power is monitored to generate an audit result; and a life loss increment report is output according to the degree of instruction violation.

[0014] The second aspect of this invention provides an APS (Automatic Start-Stop) full-process control system for thermal power units. This system includes: a modeling module that establishes a differential algebraic equation system based on the unit's physical parameters and generates a unified model constraint set; a planning module that generates a dimensionless reference trajectory in a differential flat space based on the start-stop target curve and the unified model constraint set, the trajectory representing the normalized evolution path of the unit's energy conversion efficiency and power; a constraint module that predicts the rate of change of thermal stress using fractional differential operators based on real-time metal temperature and the dimensionless reference trajectory, generating a thermal stress safety margin command that dynamically limits the boiler's heating rate; an optimization module that solves for the dynamic equilibrium point of the port Hamiltonian energy network based on the boiler's thermal storage state, turbine kinetic energy, and the dimensionless reference trajectory, generating an energy coordination correction command; and a distribution module that maps the dimensionless reference trajectory to control quantity base commands, uses the thermal stress safety margin command to constrain boiler operating quantities, and uses the energy coordination correction command to adjust turbine operating quantities, forming commands and distributing them to the actuators.

[0015] The mechanism of this invention is as follows: the multi-physical domain dynamics and algebraic constraints of the unit are encapsulated by differential algebraic equations; the complex trajectory planning is transformed into a closed analytical problem in a flat space by using differential flatness theory; fractional differential operators are introduced to quantify the thermal inertia effect of metals to achieve active stress constraints; and the real-time balance and coordination of energy flow is ensured based on the port Hamiltonian structure. Finally, safe and efficient control under physical constraints is achieved through a fast and slow dynamic decoupling distribution mechanism, which solves the problems of traditional methods relying on empirical segmentation and difficulty in balancing safety and economy.

[0016] Beneficial effects: By predicting the thermal stress change rate of thick-walled components using fractional differential operators, and dynamically generating heating rate limit commands, the stress state of key components of boilers and steam turbines is protected, effectively avoiding the risks of overheating and overpressure. Based on a unified model constraint set, physical safety boundaries are embedded in the trajectory planning stage to ensure that the start-up and shutdown paths are always within the feasible domain, thus systematically improving safety. By utilizing the characteristics of the port Hamiltonian structure, the boiler heat storage and turbine power demand are dynamically balanced in real time, solving the energy mismatch problem during start-up and shutdown, reducing unnecessary energy dissipation, and improving energy utilization efficiency. By using a fractional-order model to calculate the cumulative thermal stress cycle, the impact of each start-up and shutdown on equipment lifespan can be quantitatively assessed, providing a basis for maintenance and extending the overhaul cycle and service life of main equipment such as boilers and steam turbines. By treating the boiler, steam turbine, and auxiliary equipment as a whole for joint modeling and optimization, optimal control from fuel input to power output is achieved. Attached Figure Description

[0017] Figure 1This is a schematic diagram of an embodiment of the APS automatic start-stop full-process control method for thermal power units according to the present invention; Figure 2 This is a schematic diagram of an embodiment of an APS (Automatic Start-Stop) full-process control system for thermal power units according to the present invention. Detailed Implementation

[0018] This invention provides a method and system for the full-process control of automatic start-stop (APS) in thermal power units, addressing the contradiction between safety, economy, and speed in traditional APS systems. The terms "first," "second," "third," "fourth," etc. (if present)," in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0019] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the APS automatic start-stop full-process control method for thermal power units in this invention includes: Please see Figure 1 One embodiment of the APS automatic start-stop full-process control method for thermal power units in this invention includes: 101. Based on the physical parameters of the unit, establish a boiler-turbine-auxiliary machine coupled differential-algebraic equation system, and generate a unified model constraint set containing dynamic state constraints and algebraic equilibrium conditions; Specifically, based on the principles of boiler combustion dynamics and turbine rotor kinematics, a pressure-speed linkage differential equation is established to generate a core dynamic state variable set; Based on the steam valve flow characteristics and generator synchronization conditions, the nonlinear flow equation is transformed into an algebraic equilibrium relationship, generating a key algebraic constraint set; Based on the creep characteristics of metallic materials and the vibration limit of rotors, a state space safety boundary is constructed by normalizing the reference quantity, and a dimensionless safety envelope is generated. Based on the core dynamic state variable set and key algebraic constraint set, the physical correlation rules between boiler pressure change rate and turbine speed acceleration are derived, and a dynamic coupling constraint chain is generated. By integrating the core dynamic state variable set, key algebraic constraint set, dimensionless safety envelope, and dynamic coupling constraint chain, a unified model constraint set for standardized management is constructed.

[0020] 102. Based on the start-stop target curve and the unified model constraint set, a dimensionless reference trajectory satisfying the fifth continuous derivative is generated in the differential flat space. This trajectory represents the normalized evolution path of the unit's energy conversion efficiency and power. Specifically, a dimensionless time coordinate axis is generated based on the target total start-up and shutdown duration, and a time reference independent of unit capacity is established. Normalized unit power and thermal efficiency are selected as flat output components to form a two-dimensional flat state vector. Based on the safety envelope and dynamic coupling chain of the unified model constraint set, the endpoint derivative constraints of the flat spatial trajectory are derived, and the boundary condition equation set is generated. Embed the boundary condition equations into a fifth-order polynomial general solution structure and calculate the polynomial coefficient matrix that satisfies the endpoint position / velocity / acceleration constraints. A continuous, differentiable reference trajectory for unit power and thermal efficiency is generated by using a coefficient matrix and a dimensionless time base.

[0021] 103. Based on the real-time metal temperature and the dimensionless reference trajectory, the thermal stress change rate of key components is predicted by a fractional differential operator, and a thermal stress safety margin command that dynamically limits the boiler heating rate is generated. Specifically, based on real-time data from boiler drum wall temperature measuring points, the dimensionless temperature difference between the inner and outer walls of thick-walled components is calculated, and a normalized temperature gradient field is generated. Based on the thermal inertia parameters of metallic materials, a fractional-order differential kernel with long-term memory effect is established to generate non-integer-order differential operators; The normalized temperature gradient field is input into a non-integer order differential operator to calculate the thermal stress change trend for the next three control cycles and generate a predicted value of the stress change rate. Based on the ratio of the material fatigue limit to the predicted stress change rate, the upper limit of the allowable boiler heating rate is dynamically calculated to generate a dynamic safety margin threshold. The dynamic safety margin threshold is converted into a fuel quantity change rate limit command, which generates a thermal stress safety margin command and outputs it to the boiler main control system.

[0022] 104. Based on the boiler heat storage state, turbine kinetic energy and the dimensionless reference trajectory, solve for the dynamic equilibrium point of the port Hamiltonian energy network and generate an energy coordination correction command to coordinate the energy flow between the boiler and the turbine. Specifically, the boiler's heat storage and turbine kinetic energy are converted into dimensionless Hamiltonian function components to generate an energy flow state vector; Based on the normalized ratio of boiler fuel input power to turbine output power, a port interconnection variable characterizing energy conversion efficiency is constructed. Based on the port Hamiltonian structure theorem, the dynamic equations of the energy network are formed by simultaneously solving the energy flow state vector and the port interconnection variables. Using the thermal efficiency component of the dimensionless reference trajectory as the objective function, the steady-state operating point of the energy network equation is dynamically solved to generate the dynamic energy balance point. The deviation between the dynamic energy balance point and the current actual energy flow is calculated, mapped to the turbine control valve opening compensation amount, and an energy coordination correction command is generated.

[0023] 105. Map the dimensionless reference trajectory into a control quantity base command, use the thermal stress safety margin command to constrain the boiler operation quantity, use the energy coordination correction command to adjust the turbine operation quantity, form the final control command, and distribute it to the actuator according to the fast and slow dynamic separation principle. Specifically, the dimensionless reference trajectory is analyzed into boiler fuel command base value and turbine valve opening base value through differential flat inverse transform, generating dual-loop base command; The rate of change of the fuel command base value is limited by the thermal stress safety margin command to generate a fuel command with stress safety constraints. The energy coordination correction command is superimposed on the turbine control valve opening base value to compensate for the boiler-turbine energy flow deviation and generate the energy coordination turbine command. Based on the boiler combustion response time constant and the turbine rotor mechanical inertia, the control commands are classified into fast dynamic pressure / flow commands and slow dynamic temperature / stress commands, generating a time-domain decoupled command set; Dimensionless instructions are converted into actual engineering units and distributed to the actuators according to fast dynamic cycles (≤5 seconds) and slow dynamic cycles (≥30 seconds) to generate executable control signals.

[0024] 106. It also includes, before the instruction is distributed, verifying the feasibility of the control instruction in real time based on the security envelope of the unified model constraint set, and generating a pre-verification pass flag; The normalized deviation between the feedback signal and the command collected by the actuator is calculated based on the dynamic response characteristics of the equipment to generate the dynamic tolerance threshold. When the actual deviation continues to exceed the dynamic tolerance threshold, the system switches to the degraded control mode based on the preset safety rule base and generates a fault mode switching command. The instantaneous ratio of boiler input heat to turbine output power is monitored using a port Hamiltonian structure to generate energy conservation audit results. The degree of violation of the integral thermal stress safety margin instruction is combined with the material fatigue characteristic model to output a report on the incremental life loss.

[0025] In this embodiment of the invention, the beneficial effects are as follows: A dimensionless optimal trajectory satisfying the fifth continuous derivative is generated using differential flat space programming; active safety protection is achieved by predicting the rate of change of thermal stress through fractional differential operators; and the energy flow balance between the boiler and turbine is coordinated in real time using a port Hamiltonian structure. This effectively prevents over-temperature and over-pressure and equipment damage; optimizes start-up and shutdown economy, extends equipment life, enhances system adaptability, and the dimensionless design makes it suitable for units of different capacities, reducing manual intervention and improving operational reliability.

[0026] The above describes a full-process control method for automatic start-stop of thermal power unit APS in an embodiment of the present invention. The following describes a full-process control system for automatic start-stop of thermal power unit APS in an embodiment of the present invention. Please refer to [link / reference]. Figure 2 An embodiment of the APS (Automatic Start-Stop) full-process control system for thermal power units in this invention includes: a modeling module 201, which establishes a differential algebraic equation system based on the unit's physical parameters and generates a unified model constraint set; a planning module 202, which generates a dimensionless reference trajectory in a differential flat space based on the start-stop target curve and the unified model constraint set, the trajectory representing the normalized evolution path of the unit's energy conversion efficiency and power; a constraint module 203, which predicts the rate of change of thermal stress using fractional differential operators based on real-time metal temperature and the dimensionless reference trajectory, and generates a thermal stress safety margin command that dynamically limits the boiler's heating rate; an optimization module 204, which solves for the dynamic equilibrium point of the port Hamiltonian energy network based on the boiler's thermal storage state, turbine kinetic energy, and the dimensionless reference trajectory, and generates an energy coordination correction command; and a distribution module 205, which maps the dimensionless reference trajectory to control quantity base commands, uses the thermal stress safety margin command to constrain the boiler's operating quantities, uses the energy coordination correction command to adjust the turbine's operating quantities, forms commands, and distributes them to the actuators.

[0027] In this embodiment of the invention, a fully physical mechanism-driven automatic start-stop control system for thermal power units is constructed through five modules: modeling, planning, constraint, optimization, and distribution. The modeling module establishes a unified model based on differential algebraic equations; the planning module generates the optimal trajectory in a differentially flat space; the constraint module predicts thermal stress using fractional-order operators; the optimization module uses port Hamiltonian coordination to balance energy; and the distribution module achieves decoupled command output. Accurate prediction of thermal stress ensures equipment safety, optimal trajectory planning shortens start-stop time, and real-time energy coordination improves operational efficiency.

[0028] The present invention also provides a thermal power unit APS automatic start-stop full-process control device, which includes a memory and a processor. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the processor performs the steps of the thermal power unit APS automatic start-stop full-process control method in the above embodiments.

[0029] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when the instructions are executed on a computer, cause the computer to perform the steps of the aforementioned APS automatic start-stop full-process control method for thermal power units.

[0030] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0031] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0032] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for full-process control of automatic start-stop of thermal power unit APS, characterized in that, The aforementioned APS (Automatic Start-Stop) full-process control method for thermal power units includes: A system of differential-algebraic equations is established based on the unit's physical parameters to generate a unified model constraint set; Based on the start-stop target curve and the unified model constraint set, a dimensionless reference trajectory is generated in the differential flat space. This trajectory represents the normalized evolution path of the unit's energy conversion efficiency and power. Based on the real-time metal temperature and the dimensionless reference trajectory, the thermal stress change rate is predicted by a fractional differential operator, and a thermal stress safety margin command is generated. Based on the boiler heat storage state, turbine kinetic energy and the dimensionless reference trajectory, the dynamic equilibrium point of the port Hamiltonian energy network is solved, and energy coordination correction instructions are generated. The dimensionless reference trajectory is mapped into a control quantity base command. The thermal stress safety margin command is used to constrain the boiler operation quantity. The energy coordination correction command is used to adjust the turbine operation quantity, forming a command and distributing it to the actuator.

2. The method for full-process control of APS automatic start-stop of thermal power units according to claim 1, characterized in that, include: Based on the principles of boiler combustion dynamics and turbine rotor kinematics, differential equations are established to generate a set of dynamic state variables; Based on the flow characteristics and generator synchronization conditions, the flow equation is transformed into an algebraic relationship, generating an algebraic constraint set; Based on the properties of metallic materials and rotor vibration limits, a state-space safety boundary is constructed, and a dimensionless safety envelope is generated. Based on the dynamic state variable set and algebraic constraint set, the association rule between the boiler pressure change rate and the turbine speed acceleration is derived, and a dynamic coupling constraint chain is generated. By integrating the dynamic state variable set, algebraic constraint set, dimensionless safety envelope, and dynamic coupling constraint chain, a unified model constraint set is constructed.

3. The method for full-process control of APS automatic start-stop of thermal power units according to claim 2, characterized in that, include: A dimensionless time coordinate axis is generated based on the total start-stop duration of the target, and a time reference is established. Normalized unit power and thermal efficiency are selected as flat output components to form a two-dimensional flat state vector. Based on the safety envelope and dynamic coupling chain of the unified model constraint set, the endpoint derivative constraints of the flat spatial trajectory are derived, and the boundary condition equation set is generated. Embed the boundary condition equations into a quintic general solution structure and calculate the polynomial coefficient matrix that satisfies the endpoint constraints. A continuous, differentiable reference trajectory for unit power and thermal efficiency is generated using a coefficient matrix and a time base.

4. The method for full-process control of APS automatic start-stop of thermal power units according to claim 3, characterized in that, include: Based on real-time data from boiler drum wall temperature measuring points, the dimensionless temperature difference is calculated, and a normalized temperature gradient field is generated. Based on the thermal inertia parameters of metallic materials, a fractional-order differential kernel is established to generate non-integer-order differential operators; The normalized temperature gradient field is input into a non-integer order differential operator to calculate the trend of thermal stress change and generate a predicted value of stress change rate. Based on the ratio of the material fatigue limit to the predicted stress change rate, the upper limit of the boiler heating rate is calculated, and a dynamic safety margin threshold is generated. The dynamic safety margin threshold is converted into a fuel quantity limit command, which generates a thermal stress safety margin command and outputs it to the system.

5. The method for full-process control of APS automatic start-stop of thermal power units according to claim 4, characterized in that, include: The boiler's heat storage and turbine kinetic energy are converted into Hamiltonian function components to generate an energy flow state vector; Port interconnection variables are constructed based on the normalized ratio of boiler fuel input power to turbine output power. Based on the port Hamiltonian structure theorem, the energy flow state vector and the port interconnection variables are combined to form the energy network equation; Using the thermal efficiency component of the dimensionless reference trajectory as the objective function, the operating point of the energy network equation is solved to generate a dynamic energy balance point. The deviation between the dynamic energy balance point and the current actual energy flow is calculated, mapped to the turbine control valve opening compensation amount, and an energy coordination correction command is generated.

6. The method for full-process control of APS automatic start-stop of thermal power units according to claim 5, characterized in that, include: The dimensionless reference trajectory is analyzed into instruction base values ​​and opening base values ​​by differential flattening inverse transform, generating dual-loop base instructions; The rate of change of the fuel command base value is processed using the thermal stress safety margin command to generate the fuel command; The energy coordination correction command is superimposed on the opening base value to compensate for energy flow deviation and generate turbine command. Based on the boiler combustion response time constant and the turbine rotor mechanical inertia, control commands are classified to generate a time-domain decoupled command set; The instructions are converted into actual engineering units and distributed to the actuators according to different cycles to generate executable control signals.

7. The method for full-process control of APS automatic start-stop of thermal power units according to claim 1, characterized in that, Also includes: Before instruction distribution, a pre-verification pass flag is generated based on the control instructions of the unified model constraint set; The normalized deviation between the feedback signal and the command collected by the actuator is calculated based on the equipment response characteristics to generate a dynamic tolerance threshold. When the deviation continues to exceed the dynamic tolerance threshold, the system switches to the degraded control mode based on the safety library and generates a fault mode switching command. Monitor the instantaneous ratio of boiler input heat to turbine output power and generate audit results; Based on the degree of instruction violation, output a lifetime loss increment report.

8. A full-process APS (Automatic Start-Stop) control system for thermal power units, characterized in that, The aforementioned APS (Automatic Start-Stop) full-process control system for thermal power units includes: The modeling module establishes a system of differential-algebraic equations based on the unit's physical parameters and generates a unified set of model constraints. The planning module generates a dimensionless reference trajectory in a differential flat space based on the start-stop target curve and the unified model constraint set. This trajectory represents the normalized evolution path of the unit's energy conversion efficiency and power. The constraint module, based on the real-time metal temperature and the dimensionless reference trajectory, predicts the rate of change of thermal stress using a fractional differential operator and generates a thermal stress safety margin command that dynamically limits the boiler heating rate. The optimization module, based on the boiler's thermal storage state, the turbine's kinetic energy, and the dimensionless reference trajectory, solves for the dynamic equilibrium point of the port Hamiltonian energy network and generates energy coordination correction instructions. The distribution module maps the dimensionless reference trajectory into control quantity base instructions, uses the thermal stress safety margin instruction to constrain the boiler operating quantity, and uses the energy coordination correction instruction to adjust the turbine operating quantity, forming instructions and distributing them to the actuators.

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