A load pressure deep coupling control device for a thermal power generating unit

Abstract

The application discloses a load pressure deep coupling control device for a thermal power generating unit, which comprises a switching value acquisition module, a first analog value acquisition module, a second analog value acquisition module, a pressure state observation module, a load control loop, a pressure control loop and a control object switching loop. The pressure state observation module is used for forming a pressure state observation result according to an actual value of a main steam pressure of the unit and a set value of the main steam pressure of the unit; the load control loop and the pressure control loop respectively output a load control signal and a pressure control signal; the control object switching loop carries out non-disturbance switching between the load control signal and the pressure control signal according to the pressure state observation result, and outputs the switched control signal to a control input end of a main control of a steam turbine of the unit, so that the coordinated switching between the load control and the main steam pressure control is realized in the process of the unit load change, and the control coordination in the CCS operation mode is improved.

Description

Technical Field

[0001] This application relates to the field of thermal power generation control technology, and in particular to a deep coupling control device for load pressure of thermal power generating units. Background Technology

[0002] With the development of new power systems, thermal power generating units, in addition to undertaking conventional power generation tasks, need to participate in peak shaving and frequency regulation operations more frequently, resulting in frequent and large fluctuations in unit load. During dynamic load regulation, the main steam pressure is a crucial operating parameter reflecting the energy matching status between the boiler and turbine. Furthermore, load regulation directly affects the unit's peak shaving capacity and response performance. Therefore, balancing main steam pressure stability with load regulation capacity during load changes has become a critical technical issue in the field of thermal power generating unit control.

[0003] In related technologies, load control of thermal power generating units is generally achieved through automatic closed-loop control of the turbine main control system. When the unit is in TF (Functional Tensioner) operation mode, the turbine main control system receives the output of the main steam pressure regulator and is responsible for the closed-loop control of the main steam pressure. When the unit is in CCS (Complete Control System) operation mode, the turbine main control system receives the output of the load closed-loop regulator and is responsible for the closed-loop control of the unit load, and only intervenes in the main steam pressure through static correction of load commands based on the main steam pressure deviation. However, during rapid changes in unit load, the above control method is difficult to balance load regulation and main steam pressure stability: during load increase, when the main steam pressure is lower than the set value, the turbine control valves continue to open wider, resulting in a decrease in regulation margin and increased main steam pressure recovery inertia; during load decrease, when the main steam pressure is higher than the set value, the control valves continue to close narrower, and the reduced steam flow further increases the main steam pressure. Meanwhile, in CCS operation mode, the coupled control of main steam pressure relies solely on static correction, resulting in lag response and low regulation accuracy. Furthermore, with significant boiler combustion inertia, excessive involvement of the turbine control valve in load regulation can easily cause reverse oscillations between main steam pressure and unit load, affecting the stable operation of the system.

[0004] Therefore, in the load control of thermal power generating units, the strong coupling relationship between main steam pressure and unit load, the lag in main steam pressure regulation response under CCS operation mode, and the difficulty in balancing main steam pressure stability and unit load regulation capability during rapid load changes have become urgent technical problems that need to be solved. Summary of the Invention

[0005] This application provides a load pressure deep coupling control device for thermal power generating units, which aims to solve the problems in the load control of thermal power generating units, such as the strong coupling relationship between main steam pressure and unit load, the lag in main steam pressure regulation response under CCS operation mode, and the difficulty in simultaneously ensuring the stability of main steam pressure and the unit load regulation capability during rapid load changes.

[0006] This application provides a load-pressure deep coupling control device for thermal power generating units, used for coordinated control of load and main steam pressure of thermal power generating units under CCS operation mode. The device includes a switch quantity acquisition module, a first analog quantity acquisition module, a second analog quantity acquisition module, a pressure status observation module, a load control loop, a pressure control loop, and a control object switching loop. The switch quantity acquisition module is used to acquire the unit CCS operation mode signal. The output terminal of the switch quantity acquisition module is connected to the input terminal of the pressure status observation module, the load control loop and the control object switching loop respectively. The first analog quantity acquisition module is used to acquire the actual value of the main steam pressure of the unit. The output terminal of the first analog quantity acquisition module is connected to the pressure status observation module and the first input terminal of the pressure control loop, respectively. The second analog quantity acquisition module is used to acquire the set value of the main steam pressure of the unit. The output terminal of the second analog quantity acquisition module is connected to the pressure status observation module and the second input terminal of the pressure control loop, respectively. The output of the pressure status observation module is connected to the input of the load control loop, the pressure control loop, and the control object switching loop, respectively. The output terminals of the load control loop and the pressure control loop are respectively connected to the input terminal of the control object switching loop, and the output terminal of the control object switching loop is connected to the control input terminal of the unit's main turbine control. The pressure status observation module is used to generate pressure status observation results based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, and the CCS operation mode signal of the unit. The load control loop is used to perform closed-loop regulation and output load control signals based on the actual unit load value, the unit load set value, and the pressure status observation results. The pressure control loop is used to perform closed-loop regulation and output a pressure control signal based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, and the pressure status observation results. The control object switching loop is used to perform a seamless switching between the load control signal and the pressure control signal based on the pressure state observation results, and outputs the switched control signal to the control input terminal of the unit's turbine main control. Specifically, when the pressure status observation results indicate that the unit is in a first pressure state, the control object switching loop is used to make the load control loop work as the main control loop; when the pressure status observation results indicate that the unit is in a second pressure state, the control object switching loop is used to make the pressure control loop work as the main control loop.

[0007] Optionally, in the above scheme, the pressure state observation module includes a first pressure state observation branch, a second pressure state observation branch, and a fifth judgment module; The first pressure status observation branch includes a first subtraction module, a first inertial time calculation module, a second subtraction module, a first comparison module, a second comparison module, a first judgment module, a first delay module, a first reverse delay module, a second judgment module, and a second switch quantity acquisition module; the second switch quantity acquisition module is used to acquire the unit load increase phase signal; The second pressure state observation branch includes a third subtraction module, a second inertial time calculation module, a fourth subtraction module, a third comparison module, a fourth comparison module, a third judgment module, a second delay module, a second reverse delay module, a fourth judgment module, and a third switch quantity acquisition module; the third switch quantity acquisition module is used to acquire the unit load reduction phase signal; The first pressure status observation branch is used to form a first pressure status judgment result corresponding to the load increase stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operation mode signal, and the unit's load increase stage signal. The second pressure status observation branch is used to form a second pressure status judgment result corresponding to the load reduction stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operation mode signal, and the unit's load reduction stage signal. The fifth judgment module is used to obtain the pressure state observation result based on the first pressure state judgment result and the second pressure state judgment result.

[0008] In the above scheme, optionally, the first subtraction module is used to determine the first main steam pressure deviation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure; The first inertial time calculation module is used to perform inertial processing on the first main steam pressure deviation to obtain the inertial processed first main steam pressure deviation. The second subtraction module is used to determine the change in the first main steam pressure deviation based on the first main steam pressure deviation and the first main steam pressure deviation after inertial processing. The first comparison module is used to compare the first main steam pressure deviation with a first preset value to obtain a first comparison result; The second comparison module is used to compare the first main steam pressure deviation change with a second preset value to obtain a second comparison result; The first judgment module is used to obtain a first judgment result based on the first comparison result, the second comparison result, and the unit load increase stage signal; The first delay module is used to perform delay processing on the first judgment result to obtain a first delay result; The first reverse delay module is used to perform reverse delay processing on the first delay result to obtain the first reverse delay result; The second judgment module is used to obtain the first pressure status judgment result based on the first reverse delay result and the unit CCS operation mode signal.

[0009] In the above scheme, optionally, the third subtraction module is used to determine the second main steam pressure deviation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure; The second inertial time calculation module is used to perform inertial processing on the second main steam pressure deviation to obtain the inertial processed second main steam pressure deviation; The fourth subtraction module is used to determine the change in the second main steam pressure deviation based on the second main steam pressure deviation and the second main steam pressure deviation after inertial processing. The third comparison module is used to compare the second main steam pressure deviation with a third preset value to obtain a third comparison result; The fourth comparison module is used to compare the second main steam pressure deviation change with a fourth preset value to obtain a fourth comparison result. The third judgment module is used to obtain a second judgment result based on the third comparison result, the fourth comparison result, and the unit load reduction stage signal; The second delay module is used to delay the second judgment result to obtain a second delay result; The second reverse delay module is used to perform reverse delay processing on the second delay result to obtain the second reverse delay result; The fourth judgment module is used to obtain the second pressure state judgment result based on the second reverse delay result and the unit CCS operation mode signal.

[0010] In the above scheme, optionally, both the first delay module and the second delay module are used to change the output from 0 to 1 after a first preset time when the input is always 1, and to change the output to 0 immediately when the input changes from 1 to 0; Both the first reverse delay module and the second reverse delay module are used to delay the output from 1 to 0 after a second preset time when the input changes from 1 to 0, and the output immediately changes to 1 when the input changes from 0 to 1.

[0011] Optionally, in the above scheme, the load control loop includes a third analog quantity acquisition module, a fourth analog quantity acquisition module, a first regulator module, a first switching module, and a sixth judgment module; The third analog quantity acquisition module is used to acquire the actual value of the unit load, and the fourth analog quantity acquisition module is used to acquire the set value of the unit load. The first input terminal of the first regulator module is connected to the output terminal of the third analog quantity acquisition module, and the second input terminal of the first regulator module is connected to the output terminal of the fourth analog quantity acquisition module. The first regulator module is used to perform closed-loop regulation of the unit load according to the actual value of the unit load and the set value of the unit load. The input terminal of the first switching module is connected to the output terminal of the first regulator module, and is used to output the load control signal; The sixth judgment module is used to perform logical OR processing on the pressure state observation results and the unit TF operation mode signal to obtain a first decision result; the first decision result is used to indicate whether the first regulator module is working.

[0012] Optionally, in the above scheme, the first regulator module is a PID regulator; When the tracking switch of the first regulator module is 1, the first regulator module stops operating, and the output of the first regulator module is switched to the tracking value; When the switching switch of the first switching module is in the first logic state, the output of the first switching module tracks the input value of the first input terminal; When the switching switch of the first switching module is in the second logic state, the output of the first switching module tracks the input value of the second input terminal.

[0013] Optionally, in the above scheme, the pressure control loop includes a second regulator module, a third regulator module, and a seventh judgment module; The first input terminal of the second regulator module and the first input terminal of the third regulator module are respectively connected to the output terminal of the first analog quantity acquisition module, and the second input terminal of the second regulator module and the second input terminal of the third regulator module are respectively connected to the output terminal of the second analog quantity acquisition module; Both the second regulator module and the third regulator module are used to perform closed-loop regulation based on the actual value of the main steam pressure of the unit and the set value of the main steam pressure of the unit, and together form the pressure control signal; The seventh judgment module is used to perform logical OR processing based on the pressure state observation results and the unit TF operation mode signal to obtain a second decision result; the second decision result is used to indicate whether the second regulator module is working.

[0014] Optionally, in the above scheme, the control object switching loop includes a fourth switch quantity acquisition module, a second switching module, a third switching module, a fourth switching module, a fifth analog quantity acquisition module, an inversion module, a fifth switching module, and a sixth switching module; The fourth switch quantity acquisition module is used to acquire the unit's TF operating mode signal; The fifth analog quantity acquisition module is used to acquire the instructions output by the main control of the turbine of the unit during automatic control; The inversion module is used to invert the pressure state observation results to obtain the inverted pressure state observation results; The second switching module, the third switching module, the fourth switching module, the fifth switching module, and the sixth switching module are all used to make the output of the corresponding switching module track the input value of the first input terminal when the switching switch is in the first logic state, and to make the output of the corresponding switching module track the input value of the second input terminal when the switching switch is in the second logic state.

[0015] Optionally, in the above scheme, the control object switching loop is used to perform a seamless switching between the load control signal and the pressure control signal based on the pressure state observation result, the inverted pressure state observation result, the first decision result, the second decision result, and the instructions output by the unit turbine main control during automatic control, and outputs the switched control signal to the control input terminal of the unit turbine main control.

[0016] Compared with the prior art, this application has at least the following beneficial effects: This application, based on further analysis and research of existing technical problems, recognizes that existing technologies in load control of thermal power generating units suffer from several issues: strong coupling between main steam pressure and unit load; lag in main steam pressure regulation response under CCS operation mode; and difficulty in simultaneously maintaining main steam pressure stability and unit load regulation capacity during rapid load changes. This application addresses these problems by setting up a digital input module, a first analog input module, and a second analog input module to acquire the unit's CCS operation mode signal, the actual value of the unit's main steam pressure, and the setpoint of the unit's main steam pressure, respectively. A pressure status observation module then generates pressure status observation results based on the actual and setpoint values ​​of the unit's main steam pressure, enabling the device to identify the main steam pressure status of the unit in real time during load changes. Furthermore, by setting up load control and pressure control loops, the device can generate load control signals and pressure control signals respectively, and switch the control object according to the pressure status observation results during load changes. Seamless switching is achieved between load control signals and pressure control signals. When the pressure status observation indicates that the unit is in the first pressure state, the load control loop operates as the main control loop. When the pressure status observation indicates that the unit is in the second pressure state, the pressure control loop operates as the main control loop. Since the control signal after switching is output to the control input terminal of the unit's turbine main control, the turbine main control can automatically select the appropriate main control object under different pressure states of the unit. This avoids the problems of lag in main steam pressure response and mutual restraint between load regulation and main steam pressure control caused by relying solely on single load control or static pressure correction under CCS operation mode. This achieves coordinated cooperation between load regulation and main steam pressure control, solving the technical problems in the background technology of strong coupling between main steam pressure and unit load, lag in main steam pressure regulation response under CCS operation mode, and difficulty in balancing main steam pressure stability and unit load regulation capability during rapid load changes. Attached Figure Description

[0017] Figure 1 A schematic block diagram of a thermal power generator load pressure deep coupling control device provided in one embodiment of this application; Figure 2 Another principle block diagram of a thermal power generator load pressure deep coupling control device provided in one embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] In one embodiment, such as Figure 1 and Figure 2As shown, a load-pressure deep coupling control device for thermal power generating units is provided for coordinated control of load and main steam pressure of thermal power generating units under CCS operation mode. The device includes a switch quantity acquisition module 1, a first analog quantity acquisition module 2, a second analog quantity acquisition module 3, a pressure status observation module, a load control loop, a pressure control loop, and a control object switching loop. The switch quantity acquisition module 1 is used to acquire the unit CCS operation mode signal. The output terminal of the switch quantity acquisition module 1 is connected to the input terminal of the pressure status observation module, the load control loop and the control object switching loop respectively. The first analog quantity acquisition module 2 is used to acquire the actual value of the main steam pressure of the unit. The output terminal of the first analog quantity acquisition module 2 is connected to the pressure status observation module and the first input terminal of the pressure control loop, respectively. The second analog quantity acquisition module 3 is used to acquire the set value of the main steam pressure of the unit. The output terminal of the second analog quantity acquisition module 3 is connected to the pressure status observation module and the second input terminal of the pressure control loop, respectively. The output of the pressure status observation module is connected to the input of the load control loop, the pressure control loop, and the control object switching loop, respectively. The output terminals of the load control loop and the pressure control loop are respectively connected to the input terminal of the control object switching loop, and the output terminal of the control object switching loop is connected to the control input terminal of the unit's main turbine control. The pressure status observation module is used to generate pressure status observation results based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, and the CCS operation mode signal of the unit. The load control loop is used to perform closed-loop regulation and output load control signals based on the actual unit load value, the unit load set value, and the pressure status observation results. The pressure control loop is used to perform closed-loop regulation and output a pressure control signal based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, and the pressure status observation results. The control object switching loop is used to perform a seamless switching between the load control signal and the pressure control signal based on the pressure state observation results, and outputs the switched control signal to the control input terminal of the unit's turbine main control. Specifically, when the pressure status observation results indicate that the unit is in a first pressure state, the control object switching loop is used to make the load control loop work as the main control loop; when the pressure status observation results indicate that the unit is in a second pressure state, the control object switching loop is used to make the pressure control loop work as the main control loop.

[0020] In this embodiment, a load-pressure deep coupling control device for a thermal power generating unit is provided for coordinated control of load and main steam pressure of the thermal power generating unit under CCS operation mode. The device includes a digital input acquisition module 1, a first analog input acquisition module 2, a second analog input acquisition module 3, a pressure status observation module, a load control loop, a pressure control loop, and a control object switching loop. The digital input acquisition module 1 is used to acquire the unit's CCS operation mode signal, the first analog input acquisition module 2 is used to acquire the actual value of the unit's main steam pressure, and the second analog input acquisition module 3 is used to acquire the setpoint value of the unit's main steam pressure. The output of the digital quantity acquisition module 1 is connected to the input of the pressure status observation module, the load control loop, and the controlled object switching loop, respectively; the output of the first analog quantity acquisition module 2 is connected to the first input of the pressure status observation module and the pressure control loop, respectively; the output of the second analog quantity acquisition module 3 is connected to the second input of the pressure status observation module and the pressure control loop, respectively; the output of the pressure status observation module is connected to the input of the load control loop, the pressure control loop, and the controlled object switching loop, respectively; the output of the load control loop and the pressure control loop are connected to the input of the controlled object switching loop, and the output of the controlled object switching loop is connected to the control input of the unit's turbine main control.

[0021] In this embodiment, the first pressure state indicates that the unit's main steam pressure has not triggered the pressure control loop to take over the controlled object, and the output of the fifth judgment module 25 indicates that both the first and second pressure state judgment results are invalid. The second pressure state indicates that the unit's main steam pressure has triggered the pressure control loop to take over the controlled object, and the output of the fifth judgment module 25 indicates that the first and / or second pressure state judgment results are valid. The first pressure state judgment result is formed by the first pressure state observation branch during the load increase phase, and the second pressure state judgment result is formed by the second pressure state observation branch during the load decrease phase.

[0022] In this embodiment, the pressure status observation module generates pressure status observation results based on the actual value of the unit's main steam pressure and the setpoint of the unit's main steam pressure; the load control loop performs closed-loop regulation based on the actual value of the unit load, the setpoint of the unit load, and the pressure status observation results, and outputs a load control signal; the pressure control loop performs closed-loop regulation based on the actual value of the unit's main steam pressure, the setpoint of the unit's main steam pressure, and the pressure status observation results, and outputs a pressure control signal; the control object switching loop performs seamless switching between the load control signal and the pressure control signal based on the pressure status observation results, and outputs the switched control signal to the control input terminal of the unit's turbine main control. Specifically, when the pressure status observation results indicate that the unit is in a first pressure state, the control object switching loop makes the load control loop operate as the main control loop; when the pressure status observation results indicate that the unit is in a second pressure state, the control object switching loop makes the pressure control loop operate as the main control loop.

[0023] With the above settings, this embodiment integrates main steam pressure status observation, load control, pressure control, and seamless switching of controlled objects into the same device under CCS operation mode. This allows the device to dynamically switch between load control and pressure control based on the main steam pressure status, thereby enhancing the timeliness and coordination of main steam pressure regulation while maintaining the unit's load regulation capability.

[0024] In this embodiment, the pressure state observation module includes a first pressure state observation branch, a second pressure state observation branch, and a fifth judgment module 25; The first pressure status observation branch includes a first subtraction module 4, a first inertial time calculation module 5, a second subtraction module 6, a first comparison module 7, a second comparison module 8, a first judgment module 9, a first delay module 10, a first reverse delay module 11, a second judgment module 12, and a second switch quantity acquisition module 13; the second switch quantity acquisition module 13 is used to acquire the unit load increase stage signal; The second pressure state observation branch includes a third subtraction module 16, a second inertial time calculation module 17, a fourth subtraction module 18, a third comparison module 19, a fourth comparison module 20, a third judgment module 21, a second delay module 22, a second reverse delay module 23, a fourth judgment module 24, and a third switch quantity acquisition module 26; the third switch quantity acquisition module 26 is used to acquire the unit load reduction stage signal; The first pressure status observation branch is used to form a first pressure status judgment result corresponding to the load increase stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operation mode signal, and the unit's load increase stage signal. The second pressure status observation branch is used to form a second pressure status judgment result corresponding to the load reduction stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operation mode signal, and the unit's load reduction stage signal. The fifth judgment module 25 is used to obtain the pressure state observation result based on the first pressure state judgment result and the second pressure state judgment result.

[0025] In this embodiment, the pressure state observation module includes a first pressure state observation branch, a second pressure state observation branch, and a fifth judgment module 25. The first pressure state observation branch includes a first subtraction module 4, a first inertial time calculation module 5, a second subtraction module 6, a first comparison module 7, a second comparison module 8, a first judgment module 9, a first delay module 10, a first reverse delay module 11, a second judgment module 12, and a second switch quantity acquisition module 13, which is used to acquire signals during the unit's load increase phase. The second pressure state observation branch includes a third subtraction module 16, a second inertial time calculation module 17, a fourth subtraction module 18, a third comparison module 19, a fourth comparison module 20, a third judgment module 21, a second delay module 22, a second reverse delay module 23, a fourth judgment module 24, and a third switch quantity acquisition module 26, which is used to acquire signals during the unit's load decrease phase. The fifth judgment module 25 is used to obtain the pressure state observation result based on the first and second pressure state judgment results.

[0026] In this embodiment, the first pressure status observation branch is used to form a first pressure status judgment result corresponding to the load increase stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operating mode signal, and the unit's load increase stage signal; the second pressure status observation branch is used to form a second pressure status judgment result corresponding to the load decrease stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operating mode signal, and the unit's load decrease stage signal; the fifth judgment module 25 further integrates the judgment results of the two branches to form the final pressure status observation result. Therefore, the pressure status observation module does not judge the unit's pressure status through a single path, but instead sets different judgment branches for the load increase stage and the load decrease stage respectively, and then integrates and outputs the judgment results of the two branches.

[0027] In this application, the first pressure state refers to the state in which, during the load increase or decrease phase, the main steam pressure deviation and its changing trend meet the first type of judgment condition, causing the control object switching loop to select the load control loop as the main control loop. The second pressure state refers to the state in which, during the load increase or decrease phase, the main steam pressure deviation and its changing trend meet the second type of judgment condition, causing the control object switching loop to select the pressure control loop as the main control loop. The pressure state observation results output by the fifth judgment module 25 are used to characterize whether the unit is in the first pressure state or the second pressure state.

[0028] With the above settings, this embodiment sets up two pressure status observation branches for the load increase stage and the load decrease stage respectively, and uses the fifth judgment module 25 to integrate the judgment results of the two branches, so that the pressure status observation results can more accurately reflect the main steam pressure status of the unit under different load change stages.

[0029] In this embodiment, the first subtraction module 4 is used to determine the first main steam pressure deviation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure; The first inertial time calculation module 5 is used to perform inertial processing on the first main steam pressure deviation to obtain the inertial processed first main steam pressure deviation. The second subtraction module 6 is used to determine the change in the first main steam pressure deviation based on the first main steam pressure deviation and the first main steam pressure deviation after inertial processing. The first comparison module 7 is used to compare the first main steam pressure deviation with a first preset value to obtain a first comparison result; The second comparison module 8 is used to compare the first main steam pressure deviation change with a second preset value to obtain a second comparison result; The first judgment module 9 is used to obtain a first judgment result based on the first comparison result, the second comparison result, and the unit load increase stage signal; The first delay module 10 is used to perform delay processing on the first judgment result to obtain a first delay result; The first reverse delay module 11 is used to perform reverse delay processing on the first delay result to obtain the first reverse delay result; The second judgment module 12 is used to obtain the first pressure state judgment result based on the first reverse delay result and the unit CCS operation mode signal.

[0030] In this embodiment, the first pressure state observation branch is implemented as follows: the first subtraction module 4 determines the first main steam pressure deviation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure; the first inertial time calculation module 5 performs inertial processing on the first main steam pressure deviation to obtain the inertial-processed first main steam pressure deviation; the second subtraction module 6 determines the change in the first main steam pressure deviation based on the first main steam pressure deviation and the inertial-processed first main steam pressure deviation; the first comparison module 7 compares the first main steam pressure deviation with a first preset value to obtain a first comparison result; and the second comparison module 8 compares the change in the first main steam pressure deviation with a second preset value to obtain a second comparison result.

[0031] Furthermore, the first judgment module 9 obtains a first judgment result based on the first comparison result, the second comparison result, and the unit load increase stage signal; the first delay module 10 performs delay processing on the first judgment result to obtain a first delay result; the first reverse delay module 11 performs reverse delay processing on the first delay result to obtain a first reverse delay result; and the second judgment module 12 obtains a first pressure state judgment result based on the first reverse delay result and the unit CCS operation mode signal.

[0032] In this application, a first preset value is used to compare the first main steam pressure deviation, and a second preset value is used to compare the change in the first main steam pressure deviation. The first and second preset values ​​can be pre-set according to unit capacity, boiler inertia, load change rate, and main steam pressure control requirements. In one embodiment, the comparison value of the first comparison module 7 can be 0, and the comparison value of the second comparison module 8 can also be 0, to determine whether the main steam pressure deviation and its changing trend during the load increase phase meet the first type of condition.

[0033] This embodiment provides a complete implementation path for the first pressure state observation branch, so that the first pressure state judgment result during the load increase stage has a clear basis for formation, thereby improving the pertinence of the pressure state observation module in identifying the main steam pressure state during the load increase stage.

[0034] In this embodiment, the third subtraction module 16 is used to determine the second main steam pressure deviation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure; The second inertial time calculation module 17 is used to perform inertial processing on the second main steam pressure deviation to obtain the inertial processed second main steam pressure deviation; The fourth subtraction module 18 is used to determine the change in the second main steam pressure deviation based on the second main steam pressure deviation and the second main steam pressure deviation after inertial processing. The third comparison module 19 is used to compare the second main steam pressure deviation with a third preset value to obtain a third comparison result; The fourth comparison module 20 is used to compare the second main steam pressure deviation change with a fourth preset value to obtain a fourth comparison result; The third judgment module 21 is used to obtain a second judgment result based on the third comparison result, the fourth comparison result, and the unit load reduction stage signal; The second delay module 22 is used to perform delay processing on the second judgment result to obtain a second delay result; The second reverse delay module 23 is used to perform reverse delay processing on the second delay result to obtain the second reverse delay result; The fourth judgment module 24 is used to obtain the second pressure state judgment result based on the second reverse delay result and the unit CCS operation mode signal.

[0035] In this embodiment, the second pressure state observation branch is implemented as follows: the third subtraction module 16 determines the second main steam pressure deviation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure; the second inertial time calculation module 17 performs inertial processing on the second main steam pressure deviation to obtain the inertial-processed second main steam pressure deviation; the fourth subtraction module 18 determines the change in the second main steam pressure deviation based on the second main steam pressure deviation and the inertial-processed second main steam pressure deviation; the third comparison module 19 compares the second main steam pressure deviation with a third preset value to obtain a third comparison result; and the fourth comparison module 20 compares the change in the second main steam pressure deviation with a fourth preset value to obtain a fourth comparison result.

[0036] Furthermore, the third judgment module 21 obtains a second judgment result based on the third comparison result, the fourth comparison result, and the unit load reduction stage signal; the second delay module 22 performs delay processing on the second judgment result to obtain a second delay result; the second reverse delay module 23 performs reverse delay processing on the second delay result to obtain a second reverse delay result; and the fourth judgment module 24 obtains a second pressure state judgment result based on the second reverse delay result and the unit CCS operation mode signal. Thus, the second pressure state observation branch identifies the main steam pressure state during the load reduction stage according to the processing chain corresponding to the first pressure state observation branch.

[0037] In this application, a third preset value is used to compare the deviation of the second main steam pressure, and a fourth preset value is used to compare the change in the deviation of the second main steam pressure. Both the third and fourth preset values ​​can be preset according to the unit's operating characteristics. In one embodiment, the comparison value of the third comparison module 19 can be 0, and the comparison value of the fourth comparison module 20 can be 0, used to determine whether the main steam pressure deviation and its changing trend during the load reduction phase meet the second type of condition.

[0038] In this embodiment, both the first delay module 10 and the second delay module 22 are used to change the output from 0 to 1 after a first preset time when the input is 1, and to change the output to 0 immediately when the input changes from 1 to 0. Both the first reverse delay module 11 and the second reverse delay module 23 are used to delay the output from 1 to 0 after a second preset time when the input changes from 1 to 0, and the output immediately changes to 1 when the input changes from 0 to 1.

[0039] In this embodiment, both the first delay module 10 and the second delay module 22 are used to change the output from 0 to 1 after a first preset time when the input is 1, and to immediately change the output to 0 when the input changes from 1 to 0. Both the first reverse delay module 11 and the second reverse delay module 23 are used to change the output from 1 to 0 after a second preset time when the input changes from 1 to 0, and to immediately change the output to 1 when the input changes from 0 to 1. That is, the first delay module 10 and the second delay module 22 are used to confirm the duration of the condition being met, and the first reverse delay module 11 and the second reverse delay module 23 are used to maintain the exit process of the judgment result.

[0040] In one embodiment, both the first preset time and the second preset time can be set to 2 seconds. By delaying the confirmation, frequent changes in branch output caused by instantaneous disturbances can be avoided; by using reverse delay to maintain the status, the immediate exit of the corresponding branch judgment result due to a brief drop in input near the boundary state can be avoided. Thus, both pressure state observation branches can balance sensitivity and stability when outputting the first and second pressure state judgment results.

[0041] In this embodiment, the load control loop includes a third analog quantity acquisition module 28, a fourth analog quantity acquisition module 29, a first regulator module 30, a first switching module 31, and a sixth judgment module 37; The third analog quantity acquisition module 28 is used to acquire the actual value of the unit load, and the fourth analog quantity acquisition module 29 is used to acquire the set value of the unit load. The first input terminal of the first regulator module 30 is connected to the output terminal of the third analog quantity acquisition module 28, and the second input terminal of the first regulator module 30 is connected to the output terminal of the fourth analog quantity acquisition module 29. The first regulator module 30 is used to perform closed-loop regulation of the unit load according to the actual value of the unit load and the set value of the unit load. The input terminal of the first switching module 31 is connected to the output terminal of the first regulator module 30, and is used to output the load control signal; The sixth judgment module 37 is used to perform logical OR processing on the pressure state observation results and the unit TF operation mode signal to obtain a first decision result; the first decision result is used to indicate whether the first regulator module 30 is working.

[0042] In this embodiment, the load control loop includes a third analog quantity acquisition module 28, a fourth analog quantity acquisition module 29, a first regulator module 30, a first switching module 31, and a sixth judgment module 37. The third analog quantity acquisition module 28 acquires the actual unit load value, and the fourth analog quantity acquisition module 29 acquires the unit load setpoint. The first input terminal of the first regulator module 30 is connected to the output terminal of the third analog quantity acquisition module 28, and the second input terminal is connected to the output terminal of the fourth analog quantity acquisition module 29. The first regulator module 30 performs closed-loop regulation of the unit load based on the actual unit load value and the unit load setpoint. The input terminal of the first switching module 31 is connected to the output terminal of the first regulator module 30 and outputs a load control signal.

[0043] Furthermore, the sixth judgment module 37 performs logical OR processing on the pressure status observation results and the unit TF operating mode signal to obtain a first decision result. The first decision result is used to indicate whether the first regulator module 30 should operate. In other words, the load control loop not only generates the unit load control signal, but also judges its activation conditions through the sixth judgment module 37, causing the first regulator module 30 to be activated or deactivated in the corresponding state.

[0044] In this embodiment, the first regulator module 30 is a PID regulator; When the tracking switch of the first regulator module 30 is 1, the first regulator module 30 stops operating, and the output of the first regulator module 30 is switched to the tracking value. When the switching switch of the first switching module 31 is in the first logic state, the output of the first switching module 31 tracks the input value of the first input terminal; When the switching switch of the first switching module 31 is in the second logic state, the output of the first switching module 31 tracks the input value of the second input terminal.

[0045] In this embodiment, the first regulator module 30 is a PID regulator. When the tracking switch of the first regulator module 30 is 1, the first regulator module 30 stops operating, and the output of the first regulator module 30 switches to the tracking value; when the switching switch of the first switching module 31 is in the first logic state, the output of the first switching module 31 tracks the input value of the first input terminal; when the switching switch of the first switching module 31 is in the second logic state, the output of the first switching module 31 tracks the input value of the second input terminal.

[0046] In one embodiment, the first regulator module 30 uses a conventional PID algorithm to perform closed-loop regulation of the unit load, while the first switching module 31 switches or maintains tracking between different input values ​​based on the state of the switching switch. By combining PID regulation with the tracking of the switching module, significant abrupt changes can be avoided when the load control loop switches between different operating states.

[0047] In this embodiment, the pressure control loop includes a second regulator module 40, a third regulator module 47, and a seventh judgment module 44; The first input terminal of the second regulator module 40 and the first input terminal of the third regulator module 47 are respectively connected to the output terminal of the first analog quantity acquisition module 2, and the second input terminal of the second regulator module 40 and the second input terminal of the third regulator module 47 are respectively connected to the output terminal of the second analog quantity acquisition module 3. The second regulator module 40 and the third regulator module 47 are both used to perform closed-loop regulation based on the actual value of the main steam pressure of the unit and the set value of the main steam pressure of the unit, and together form the pressure control signal; The seventh judgment module 44 is used to perform logical OR processing based on the pressure state observation results and the unit TF operation mode signal to obtain a second decision result; the second decision result is used to indicate whether the second regulator module 40 is working.

[0048] In this embodiment, the pressure control loop includes a second regulator module 40, a third regulator module 47, and a seventh judgment module 44. The first input terminals of the second regulator module 40 and the third regulator module 47 are respectively connected to the output terminals of the first analog quantity acquisition module 2, and the second input terminals of the second regulator module 40 and the third regulator module 47 are respectively connected to the output terminals of the second analog quantity acquisition module 3. Both the second regulator module 40 and the third regulator module 47 are used to perform closed-loop regulation based on the actual value of the unit's main steam pressure and the set value of the unit's main steam pressure, jointly forming a pressure control signal.

[0049] Furthermore, the seventh judgment module 44 performs logical OR processing based on the pressure status observation results and the unit TF operating mode signal to obtain a second decision result; the second decision result is used to indicate whether the second regulator module 40 is working. Thus, the pressure control loop can not only generate the main steam pressure control signal, but also determine the engagement status of the pressure control loop based on the pressure status observation results and the relevant logic of the TF operating mode.

[0050] In this embodiment, the control object switching loop includes a fourth switch quantity acquisition module 32, a second switching module 33, a third switching module 34, a fourth switching module 35, a fifth analog quantity acquisition module 36, an inversion module 41, a fifth switching module 42, and a sixth switching module 43; The fourth switch quantity acquisition module 32 is used to acquire the unit TF operating mode signal; The fifth analog quantity acquisition module 36 is used to acquire the instructions output by the main control of the turbine of the unit during automatic control; The inversion module 41 is used to invert the pressure state observation results to obtain the inverted pressure state observation results. The second switching module 33, the third switching module 34, the fourth switching module 35, the fifth switching module 42, and the sixth switching module 43 are all used to make the output of the corresponding switching module track the input value of the first input terminal when the switching switch is in the first logic state, and to make the output of the corresponding switching module track the input value of the second input terminal when the switching switch is in the second logic state.

[0051] In this embodiment, the control object switching loop includes a fourth digital quantity acquisition module 32, a second switching module 33, a third switching module 34, a fourth switching module 35, a fifth analog quantity acquisition module 36, an inversion module 41, a fifth switching module 42, and a sixth switching module 43. The fourth digital quantity acquisition module 32 acquires the unit's TF operating mode signal; the fifth analog quantity acquisition module 36 acquires the commands output by the unit's turbine main control automatic control; and the inversion module 41 inverts the pressure state observation results to obtain the inverted pressure state observation results. The second switching module 33, the third switching module 34, the fourth switching module 35, the fifth switching module 42, and the sixth switching module 43 are all used to make the output of the corresponding switching module track the input value of the first input terminal when the switching switch is in the first logic state, and to make the output of the corresponding switching module track the input value of the second input terminal when the switching switch is in the second logic state.

[0052] In this embodiment, the control object switching loop performs a seamless switch between load control signals and pressure control signals based on pressure state observation results, inverted pressure state observation results, first decision results, second decision results, and instructions output during the automatic control of the unit's turbine main control system. The switched control signal is then output to the control input terminal of the unit's turbine main control system. Because the control object switching loop includes multiple switching modules and an inversion module 41, it can both preserve the original signal path during the automatic control of the unit's turbine main control system and smoothly switch between load control and pressure control based on pressure state and related judgment results.

[0053] This embodiment enables the control object switching loop to coordinate and switch load control signals, pressure control signals, and instructions output during the automatic control of the turbine main control unit in a unified manner, thus forming a key execution link in the whole device to realize the deep coupling switching between load control objects and pressure control objects.

[0054] In this embodiment, the control object switching loop is used to perform a seamless switching between the load control signal and the pressure control signal based on the pressure state observation result, the inverted pressure state observation result, the first decision result, the second decision result, and the instructions output by the unit turbine main control during automatic control, and outputs the switched control signal to the control input terminal of the unit turbine main control.

[0055] In this embodiment, the control object switching loop performs a seamless switch between the load control signal and the pressure control signal based on the pressure state observation results, the inverted pressure state observation results, the first decision result, the second decision result, and the instructions output by the unit's turbine main control automatic control. The switched control signal is then output to the control input terminal of the unit's turbine main control system. In other words, the control object switching loop does not simply switch between two control signals, but rather achieves dynamic, seamless switching of the control object through the combined participation of multiple state variables, multiple judgment results, and the original automatic control instructions.

[0056] In this embodiment, when the pressure status observation results indicate that the unit is in the first pressure state, the control object switching loop selects the load control signal as the main control signal output to the control input terminal of the unit's turbine main control; when the pressure status observation results indicate that the unit is in the second pressure state, the control object switching loop selects the pressure control signal as the main control signal output to the control input terminal of the unit's turbine main control; at the same time, during the switching process, the coordination effect on the commands output by the unit's turbine main control during automatic control is retained, thereby realizing a smooth switching from load control to pressure control, or from pressure control to load control.

[0057] Through the above settings, this embodiment further defines the comprehensive switching logic of the control object switching loop, enabling the entire device to smoothly switch between load control signals and pressure control signals under different pressure conditions, and stably output the switching result to the control input terminal of the unit's turbine main control, thereby improving the control continuity and operational coordination of the device during the dynamic load adjustment process.

[0058] This embodiment provides a load-pressure deep coupling control device for thermal power generating units, which achieves seamless switching between load control and pressure control based on pressure deviation and its changing trend. By combining multi-condition logic judgment and delay and reverse delay module settings, the accuracy and robustness of switching, as well as the continuity of control, are improved.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A load-pressure deep coupling control device for thermal power generating units, used for coordinated control of load and main steam pressure of thermal power generating units under CCS operation mode, characterized in that, The device includes a digital quantity acquisition module (1), a first analog quantity acquisition module (2), a second analog quantity acquisition module (3), a pressure status observation module, a load control loop, a pressure control loop, and a control object switching loop; The switch quantity acquisition module (1) is used to acquire the unit CCS operation mode signal. The output terminal of the switch quantity acquisition module (1) is connected to the input terminal of the pressure status observation module, the load control loop and the control object switching loop respectively. The first analog quantity acquisition module (2) is used to acquire the actual value of the main steam pressure of the unit. The output terminal of the first analog quantity acquisition module (2) is connected to the pressure status observation module and the first input terminal of the pressure control loop respectively. The second analog quantity acquisition module (3) is used to acquire the set value of the main steam pressure of the unit. The output terminal of the second analog quantity acquisition module (3) is connected to the pressure status observation module and the second input terminal of the pressure control loop respectively. The output of the pressure status observation module is connected to the input of the load control loop, the pressure control loop, and the control object switching loop, respectively. The output terminals of the load control loop and the pressure control loop are respectively connected to the input terminal of the control object switching loop, and the output terminal of the control object switching loop is connected to the control input terminal of the unit's main turbine control. The pressure status observation module is used to generate pressure status observation results based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, and the CCS operation mode signal of the unit. The load control loop is used to perform closed-loop regulation and output load control signals based on the actual unit load value, the unit load set value, and the pressure status observation results. The pressure control loop is used to perform closed-loop regulation and output a pressure control signal based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, and the pressure status observation results. The control object switching loop is used to perform a seamless switching between the load control signal and the pressure control signal based on the pressure state observation results, and outputs the switched control signal to the control input terminal of the unit's turbine main control. Specifically, when the pressure status observation results indicate that the unit is in a first pressure state, the control object switching loop is used to make the load control loop work as the main control loop; when the pressure status observation results indicate that the unit is in a second pressure state, the control object switching loop is used to make the pressure control loop work as the main control loop.

2. The apparatus according to claim 1, characterized in that, The pressure state observation module includes a first pressure state observation branch, a second pressure state observation branch, and a fifth judgment module (25). The first pressure state observation branch includes a first subtraction module (4), a first inertial time calculation module (5), a second subtraction module (6), a first comparison module (7), a second comparison module (8), a first judgment module (9), a first delay module (10), a first reverse delay module (11), a second judgment module (12), and a second switch quantity acquisition module (13); the second switch quantity acquisition module (13) is used to acquire the unit load increase stage signal; The second pressure state observation branch includes a third subtraction module (16), a second inertial time calculation module (17), a fourth subtraction module (18), a third comparison module (19), a fourth comparison module (20), a third judgment module (21), a second delay module (22), a second reverse delay module (23), a fourth judgment module (24), and a third switch quantity acquisition module (26); the third switch quantity acquisition module (26) is used to acquire the unit load reduction stage signal; The first pressure status observation branch is used to form a first pressure status judgment result corresponding to the load increase stage based on the actual value of the main steam pressure of the unit, the set value of the main steam pressure of the unit, the CCS operation mode signal of the unit and the load increase stage signal of the unit. The second pressure status observation branch is used to form a second pressure status judgment result corresponding to the load reduction stage based on the actual value of the unit's main steam pressure, the set value of the unit's main steam pressure, the unit's CCS operation mode signal, and the unit's load reduction stage signal. The fifth judgment module (25) is used to obtain the pressure state observation result based on the first pressure state judgment result and the second pressure state judgment result.

3. The apparatus according to claim 2, characterized in that, The first subtraction module (4) is used to determine the first main steam pressure deviation based on the actual value of the main steam pressure of the unit and the set value of the main steam pressure of the unit; The first inertial time calculation module (5) is used to perform inertial processing on the first main steam pressure deviation to obtain the first main steam pressure deviation after inertial processing. The second subtraction module (6) is used to determine the change in the first main steam pressure deviation based on the first main steam pressure deviation and the first main steam pressure deviation after inertial processing. The first comparison module (7) is used to compare the first main steam pressure deviation with a first preset value to obtain a first comparison result; The second comparison module (8) is used to compare the first main steam pressure deviation change with the second preset value to obtain a second comparison result; The first judgment module (9) is used to obtain a first judgment result based on the first comparison result, the second comparison result and the unit load increase stage signal; The first delay module (10) is used to perform delay processing on the first judgment result to obtain the first delay result; The first reverse delay module (11) is used to perform reverse delay processing on the first delay result to obtain the first reverse delay result; The second judgment module (12) is used to obtain the first pressure state judgment result based on the first reverse delay result and the unit CCS operation mode signal.

4. The apparatus according to claim 2, characterized in that, The third subtraction module (16) is used to determine the second main steam pressure deviation based on the actual value of the main steam pressure of the unit and the set value of the main steam pressure of the unit; The second inertial time calculation module (17) is used to perform inertial processing on the second main steam pressure deviation to obtain the inertial processed second main steam pressure deviation; The fourth subtraction module (18) is used to determine the change in the second main steam pressure deviation based on the second main steam pressure deviation and the second main steam pressure deviation after inertial processing. The third comparison module (19) is used to compare the second main steam pressure deviation with the third preset value to obtain the third comparison result; The fourth comparison module (20) is used to compare the second main steam pressure deviation change with the fourth preset value to obtain the fourth comparison result; The third judgment module (21) is used to obtain a second judgment result based on the third comparison result, the fourth comparison result and the unit load reduction stage signal; The second delay module (22) is used to perform delay processing on the second judgment result to obtain the second delay result; The second reverse delay module (23) is used to perform reverse delay processing on the second delay result to obtain the second reverse delay result; The fourth judgment module (24) is used to obtain the second pressure state judgment result based on the second reverse delay result and the unit CCS operation mode signal.

5. The apparatus according to claim 2, characterized in that, Both the first delay module (10) and the second delay module (22) are used to change the output from 0 to 1 after a first preset time when the input is 1, and to change the output to 0 immediately when the input changes from 1 to 0. The first reverse delay module (11) and the second reverse delay module (23) are both used to delay the output from 1 to 0 after a second preset time when the input changes from 1 to 0, and the output immediately changes to 1 when the input changes from 0 to 1.

6. The apparatus according to claim 1, characterized in that, The load control loop includes a third analog quantity acquisition module (28), a fourth analog quantity acquisition module (29), a first regulator module (30), a first switching module (31), and a sixth judgment module (37). The third analog quantity acquisition module (28) is used to acquire the actual value of the unit load, and the fourth analog quantity acquisition module (29) is used to acquire the set value of the unit load. The first input terminal of the first regulator module (30) is connected to the output terminal of the third analog quantity acquisition module (28), and the second input terminal of the first regulator module (30) is connected to the output terminal of the fourth analog quantity acquisition module (29). The first regulator module (30) is used to perform closed-loop regulation of the unit load according to the actual value of the unit load and the set value of the unit load. The input terminal of the first switching module (31) is connected to the output terminal of the first regulator module (30) for outputting the load control signal; The sixth judgment module (37) is used to perform logical OR processing on the pressure state observation results and the unit TF operation mode signal to obtain a first decision result; the first decision result is used to indicate whether the first regulator module (30) is working.

7. The apparatus according to claim 6, characterized in that, The first regulator module (30) is a PID regulator; When the tracking switch of the first regulator module (30) is 1, the first regulator module (30) stops operating, and the output of the first regulator module (30) is switched to the tracking value. When the switching switch of the first switching module (31) is in the first logic state, the output of the first switching module (31) tracks the input value of the first input terminal; When the switching switch of the first switching module (31) is in the second logic state, the output of the first switching module (31) tracks the input value of the second input terminal.

8. The apparatus according to claim 6, characterized in that, The pressure control loop includes a second regulator module (40), a third regulator module (47), and a seventh judgment module (44). The first input terminal of the second regulator module (40) and the first input terminal of the third regulator module (47) are respectively connected to the output terminal of the first analog quantity acquisition module (2), and the second input terminal of the second regulator module (40) and the second input terminal of the third regulator module (47) are respectively connected to the output terminal of the second analog quantity acquisition module (3). The second regulator module (40) and the third regulator module (47) are both used to perform closed-loop regulation based on the actual value of the main steam pressure of the unit and the set value of the main steam pressure of the unit, and together form the pressure control signal; The seventh judgment module (44) is used to perform logical OR processing based on the pressure state observation results and the unit TF operation mode signal to obtain a second decision result; the second decision result is used to indicate whether the second regulator module (40) is working.

9. The apparatus according to claim 8, characterized in that, The control object switching loop includes a fourth switch quantity acquisition module (32), a second switching module (33), a third switching module (34), a fourth switching module (35), a fifth analog quantity acquisition module (36), an inversion module (41), a fifth switching module (42), and a sixth switching module (43). The fourth switch quantity acquisition module (32) is used to acquire the unit TF operation mode signal; The fifth analog quantity acquisition module (36) is used to acquire the instructions output by the main control of the turbine of the unit during automatic control; The inversion module (41) is used to invert the pressure state observation results to obtain the inverted pressure state observation results; The second switching module (33), the third switching module (34), the fourth switching module (35), the fifth switching module (42) and the sixth switching module (43) are all used to make the output of the corresponding switching module track the input value of the first input terminal when the switching switch is in the first logic state, and to make the output of the corresponding switching module track the input value of the second input terminal when the switching switch is in the second logic state.

10. The apparatus according to claim 9, characterized in that, The control object switching loop is used to perform a seamless switching between the load control signal and the pressure control signal based on the pressure state observation result, the inverted pressure state observation result, the first decision result, the second decision result, and the instructions output by the unit turbine main control during automatic control, and outputs the switched control signal to the control input terminal of the unit turbine main control.

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