CN114961907B - Thermal decoupling control method and system for double-extraction supercritical intermediate reheat unit - Google Patents
Thermal decoupling control method and system for double-extraction supercritical intermediate reheat unit Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/304—Spool rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/335—Output power or torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/70—Type of control algorithm
- F05D2270/706—Type of control algorithm proportional-integral-differential
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/70—Type of control algorithm
- F05D2270/707—Type of control algorithm fuzzy logic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a thermal decoupling control method and a system for a double-extraction supercritical intermediate reheat unit, wherein the method comprises the following steps: acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of a steam turbine of a double extraction supercritical intermediate reheat unit; inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and outputting high-pressure valve and medium-pressure valve instructions through the fuzzy self-adaptive PID controller; based on the high-pressure valve and the medium-pressure valve, the thermal decoupling control of the double-extraction supercritical intermediate reheating unit is realized. The thermal decoupling control method is a thermal decoupling control strategy based on a fuzzy self-adaptive PID controller, and can control the opening of a high-voltage regulating valve and a medium-voltage regulating valve under the action of a thermal decoupling control system, so that static decoupling control of electric load and thermal load can be realized.
Description
Technical Field
The invention belongs to the technical field of supercritical generator set system control, and particularly relates to a thermal decoupling control method and a thermal decoupling control system for a double-extraction supercritical intermediate reheat unit.
Background
The cogeneration unit can be divided into a back pressure type unit and a condensing type unit; the back pressure steam turbine has better economy because the heat consumption is greatly reduced due to the reduction of the cold source loss in the condenser, but the back pressure heat supply unit is generally matched with a specific industrial production line because the exhaust pressure is limited by a heated user and is difficult to meet the requirement of independently adjusting the electric power and the steam supply flow; the condensing unit is a type of cogeneration unit which extracts the steam after partial work is done in the steam turbine and is used for heat supply, and the unit can realize independent variation of thermoelectric load in a larger range theoretically without mutual influence. The condensed gas type heat supply unit can be further divided into two types of non-adjusting steam extraction type and adjusting steam extraction type; the capacity of the non-adjusting steam extraction type unit is generally 300MW, and the most remarkable characteristic is that the steam extraction is only provided in the heating period, the heat supply and steam extraction pressure cannot be adjusted and industrial heat cannot be provided; the adjustable steam extraction type condensing unit is a unit with wide application range, wider applicability and stronger flexibility due to wide variation range of thermoelectric load, is generally applied to large-amplitude and high-frequency variation of the thermal load and higher power generation requirement, and is a unit type of cogeneration unit with wider application range.
The root cause of the self-adjusting problem of the heating unit is that the controlled object, namely the extraction steam turbine, lacks enough knowledge, and the control strategy lacks a top layer design capable of reflecting the thermal characteristics of the specific heating unit and the flow characteristics of the adjusting mechanism, so that the control effect of the thermal load and the electric load is poor; in the future, as the heating unit further develops towards the directions of large capacity, high parameters, intermediate reheating, double-stage steam extraction and the like, the regulating system becomes more complex. Therefore, based on the operation characteristics of the heat supply turbine unit, an advanced thermal decoupling control algorithm is researched and developed, so that the heat and electric loads accurately follow the change of the requirements of heat users and a power grid, and the heat supply unit participates in the power grid dispatching control operation, thereby having important theoretical significance and engineering practical value.
At present, the coupling between the steam extraction heat supply and the power supply of the supercritical unit mainly adopts a control mode of combining feedforward and feedback; the decoupling feedforward adjustment of the thermal decoupling is completed by a diagonal matrix decoupling method designed by an optimal adjusting mechanism, and the feedback adjustment is completed by connecting PI regulators in a control loop of a high-voltage adjusting gate and a low-voltage adjusting gate in series. The existing control mode has good applicability to non-reheat single-extraction steam extraction units, but the control effect can not meet the requirements under the condition that the high-capacity heat supply units and the pure condensation are transformed into the heat supply units and the double-extraction heat supply units are increased gradually under the new situation. Therefore, a reasonable thermal decoupling control strategy is needed to be provided, and static decoupling control of electric load and thermal load is realized in a double-extraction mode of the supercritical intermediate reheat unit.
Disclosure of Invention
The invention aims to provide a thermal decoupling control method and a thermal decoupling control system for a double-extraction supercritical intermediate reheat unit, which are used for solving one or more of the technical problems. The thermal decoupling control method is a thermal decoupling control strategy based on a fuzzy self-adaptive PID controller, and can control the opening of a high-voltage regulating valve and a medium-voltage regulating valve under the action of a thermal decoupling control system, so that static decoupling control of electric load and thermal load can be realized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention discloses a thermal decoupling control method of a double-extraction supercritical intermediate reheat unit, which comprises the following steps:
Acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of a steam turbine of a double extraction supercritical intermediate reheat unit;
Inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and outputting high-pressure valve and medium-pressure valve instructions through the fuzzy self-adaptive PID controller;
Based on the high-pressure valve and the medium-pressure valve, the thermal decoupling control of the double-extraction supercritical intermediate reheating unit is realized.
The invention further improves that the double-extraction supercritical intermediate reheat unit comprises: a steam turbine module;
The turbine module includes: a high pressure cylinder, a medium pressure cylinder and a low pressure cylinder;
The exhaust steam of the high-pressure cylinder is divided into two parts, wherein one part is the first extraction steam, and the other part enters a boiler for reheating and heating; the heated steam enters the medium pressure cylinder to expand and do work;
The exhaust steam of the medium pressure cylinder is divided into two parts, wherein one part is second extraction steam, and the other part enters the low pressure cylinder to do expansion work.
The invention further improves that the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of the steam turbine are input into a fuzzy self-adaptive PID controller, and the step of outputting the valve commands of the high-pressure valve and the medium-pressure valve through the fuzzy self-adaptive PID controller specifically comprises the following steps:
Inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and obtaining a rotating speed deviation variable quantity, a first steam extraction pressure deviation variable quantity and a second steam extraction pressure deviation variable quantity under the action of differential d/dt in the controller; the deviation and the deviation variation are input into a Mamdani fuzzy inference system under the action of corresponding quantization factors, and the output of the system outputs valve instructions of a high-pressure valve and a medium-pressure valve under the action of function expressions Fp, fi and Fd;
Wherein the parameter setter of the fuzzy self-adaptive PID controller is a two-input three-output Mamdani fuzzy reasoning system expressed as e (k) =r (k) -r 0, Wherein, r (k) and r 0 are the frequency and the frequency given value of the kth sampling time respectively; Δt is the sampling period; ke is the quantization factor of the deviation; kec is the quantization factor of the variation of the deviation; e is deviation, ec is deviation change, and the deviation is used as input of a fuzzy reasoning system; cp, ci and Cd are used as the output of the fuzzy inference system; fp, fi and Fd are preset values of the fuzzy self-adaptive PID controller, wherein the function expression is Fp＝kp+cp·kp、Fi＝ki+ci·ki、Fd＝kd+cd·kd,kp、ki、kd.
The invention further improves that the step of realizing the thermal decoupling control of the double-extraction supercritical intermediate reheat unit based on the high pressure valve and the medium pressure valve command specifically comprises the following steps:
Based on the high-pressure valve and the medium-pressure valve, valve command realization: (1) Under the disturbance of the electric load, the thermal load of the generator set remains unchanged after the response is completed; (2) Under the disturbance of the thermal load, the output power of the generator set remains unchanged after the response is completed.
The invention further improves that under the disturbance of the electric load, the thermal load of the generator set after the response is completed is kept unchanged, and the method specifically comprises the following steps:
When the electric load is increased, opening degrees of the high-pressure valve and the medium-pressure valve are increased based on valve instructions of the high-pressure valve and the medium-pressure valve, so that steam inflow rates of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are increased, and the thermal load of the generator set is kept unchanged after response is completed;
When the electric load is reduced, opening degrees of the high-pressure valve and the medium-pressure valve are reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, so that steam inflow of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder is reduced, and the thermal load of the generator set is kept unchanged after response is completed.
The invention further improves that under the condition of the thermal load disturbance, the output power of the generator set remains unchanged after the response is completed, and the method specifically comprises the following steps:
When the first steam extraction flow rate is increased, the opening of the high-pressure valve is increased based on valve instructions of the high-pressure valve and the medium-pressure valve, and the opening of the medium-pressure valve is kept unchanged, so that the increasing amount of the steam inlet of the high-pressure valve is consistent with the increasing amount of the first steam extraction flow rate, the steam extraction pressure of the medium-pressure cylinder is kept unchanged, and the output power of the generator set is kept unchanged after the response is completed;
When the first steam extraction flow is reduced, the opening of the high-pressure valve is reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, and the opening of the medium-pressure valve is kept unchanged, so that the reduction of the steam inlet quantity of the high-pressure valve is consistent with the reduction of the first steam extraction flow, the steam extraction pressure of the medium-pressure cylinder is kept unchanged, and the output power of the generator set is kept unchanged after the response is completed.
The invention further improves that under the condition of the thermal load disturbance, the output power of the generator set remains unchanged after the response is completed, and the method specifically comprises the following steps:
when the second steam extraction flow rate is increased, opening degrees of the high-pressure valve and the medium-pressure valve are increased based on valve instructions of the high-pressure valve and the medium-pressure valve, so that the output power of the generator set is kept unchanged after the response is completed;
and when the second steam extraction flow is reduced, opening degrees of the high-pressure valve and the medium-pressure valve are reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, so that the output power of the generator set is kept unchanged after the response is finished.
The invention further improves that the step of realizing the thermal decoupling control of the double-extraction supercritical intermediate reheat unit based on the valve command of the high pressure valve and the medium pressure valve specifically comprises the following steps:
Valve instructions of the high-pressure valve and the medium-pressure valve are subjected to electrohydraulic conversion through a servo valve and a slide valve, so that a driving instruction is obtained;
and based on the driving instruction, driving a hydraulic actuating mechanism to adjust the opening degrees of the high-pressure valve and the medium-pressure valve, so as to realize the thermal decoupling control of the double-extraction supercritical intermediate reheating unit.
The invention discloses a thermoelectric decoupling control system of a double-extraction supercritical intermediate reheat unit, which comprises the following components:
the deviation acquisition module is used for acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of the steam turbine;
the valve instruction acquisition module is used for inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into the fuzzy self-adaptive PID controller, and outputting valve instructions of the high-pressure valve and the medium-pressure valve through the fuzzy self-adaptive PID controller;
And the decoupling execution module is used for realizing the thermal decoupling control of the double-extraction supercritical intermediate reheating unit based on the high-pressure valve and medium-pressure valve instructions.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a thermal decoupling control method of a double-extraction supercritical intermediate reheat unit, which is based on a thermal decoupling control strategy provided by a fuzzy self-adaptive PID controller, determines input variables and output variables (namely control quantity) of the fuzzy controller, and the fuzzy PID parameter setter is a two-input three-output Mamdani fuzzy reasoning system, PID parameters can be adjusted in real time by adopting self-adaptive PID control, so that the problem of failure of the conventional PID control effect under variable working conditions is solved, and the opening degrees of a high-voltage regulating valve and a medium-voltage regulating valve are controlled under the action of the thermal decoupling control system, so that static decoupling control of electric load and thermal load is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description of the embodiments or the drawings used in the description of the prior art will make a brief description; it will be apparent to those of ordinary skill in the art that the drawings in the following description are of some embodiments of the invention and that other drawings may be derived from them without undue effort.
FIG. 1 is a schematic flow diagram of a thermal decoupling control method for a double-extraction supercritical intermediate reheat unit according to an embodiment of the present invention;
FIG. 2 is a simplified schematic diagram of a supercritical dual extraction generator set according to an embodiment of the present invention;
FIG. 3 is a simplified schematic diagram of a fuzzy adaptive PID controller according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a servo valve-servomotor actuator model in an embodiment of the invention;
In fig. 2: 1. supercritical once-through boiler; 2. a steam turbine module; 3. a generator; 4. a condenser; 5. a circulation pump; 6. a low-adding regenerator; 7. a deaerator; 8. a high-heating regenerator; 9. a first regulating valve; 10. a second regulating valve;
In fig. 4: CV-regulating valve opening command; t 0 —the engine on time constant; t C —the engine off time constant; t m —servo time constant; t 2 —a motor travel feedback time constant; GV-actual opening of the regulator valve.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, a thermal decoupling control method for a double-extraction supercritical intermediate reheat unit according to an embodiment of the present invention specifically includes the following steps:
Acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of a steam turbine of a double extraction supercritical intermediate reheat unit;
Inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and outputting high-pressure valve and medium-pressure valve instructions through the fuzzy self-adaptive PID controller;
Based on the high-pressure valve and medium-pressure valve instructions, the thermal decoupling control of the double-extraction supercritical intermediate reheating unit is realized
The thermal decoupling control method provided by the embodiment of the invention is a thermal decoupling control strategy based on a fuzzy self-adaptive PID controller, and can realize static decoupling control of electric load and thermal load by controlling the opening of a high-voltage regulating valve and a medium-voltage regulating valve under the action of a thermal decoupling control system.
Referring to fig. 2, fig. 2 is a simplified model schematic diagram of a supercritical dual extraction generator set. The invention provides a thermoelectric decoupling control system of a double-extraction supercritical intermediate reheating unit, which comprises main parts such as a supercritical direct-current boiler 1, a steam turbine module 2, a generator 3, a condenser 4, a circulating pump 5, a low-heating regenerator 6, a deaerator 7, a high-heating regenerator 8, a first regulating valve 9, a second regulating valve 10 and the like. Wherein, the fuel in the supercritical once-through boiler 1 and the preheated air are mixed and burnt in the hearth, and the generated high-temperature flue gas releases heat to the circulating water. The steam turbine module mainly comprises three parts, namely a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and the like; the supercritical once-through boiler 1 heats circulating water to obtain high-temperature and high-pressure superheated steam, and the superheated steam enters a high-pressure cylinder through a high-pressure valve and performs expansion work; the exhaust steam of the high-pressure cylinder is divided into two parts, one part is the first extraction steam (namely extraction steam 1 in fig. 4), the other part enters a boiler for reheating, and the heated steam enters the medium-pressure cylinder for expansion work; part of the exhaust steam of the medium-pressure cylinder is second exhaust steam (namely, exhaust steam 2 in fig. 4), and the rest part of the exhaust steam enters the low-pressure cylinder to expand and do work; the turbine module 2 is connected to a generator 3 in which mechanical energy is converted into electrical energy.
Based on the set statement, the set is provided with two times of steam extraction, the first steam extraction is carried out at the outlet of the high-pressure cylinder, and the steam extraction port of the medium-pressure cylinder is provided with the second steam extraction; the circulating water is heated into superheated steam in the once-through boiler, and enters a high-pressure cylinder to complete expansion work under the adjustment of a high-pressure main steam valve; one part of the high-pressure cylinder exhaust steam is used for first steam extraction, the other part of the high-pressure cylinder exhaust steam enters a boiler to absorb heat again, and the absorbed steam enters a medium-pressure cylinder through a medium-pressure regulating valve to complete expansion work; part of exhaust steam of the medium pressure cylinder is used for second extraction, the other part of exhaust steam of the medium pressure cylinder is used for deaerator extraction, and the rest exhaust steam of the medium pressure cylinder enters the low pressure cylinder to expand and do work; the residual exhaust steam of the medium-pressure cylinder enters a low-pressure cylinder which is symmetrically arranged to do expansion work, and the exhaust steam passes through a condenser to obtain condensed water; the condensed water is respectively sent to a low-heating regenerator, a deaerator and a high-heating regenerator under the action of a circulating pump; the circulating water at the outlet of the high-heating regenerator enters the boiler to absorb heat, so that the whole thermal power generation cycle is completed. The electric load and the thermal load of the double-extraction steam turbine set are related, the model realizes coordination control of the electric load and the thermal load by controlling the opening of a valve, the steam extraction pressure of a high-pressure cylinder and a medium-pressure cylinder is used as lumped pressure for modeling, and the steam extraction pressure of each cylinder is the same as the corresponding steam extraction pressure, so that a control strategy is provided.
In the embodiment of the invention, the control strategy is a thermal decoupling control strategy of a double-extraction turbine unit, and comprises three control variables, namely the rotating speed of the turbine, the first extraction pressure and the second extraction pressure, wherein the three variables respectively represent an electric load, a first thermal load and a second thermal load; under the action of a fuzzy self-adaptive PID controller, the rotating speed of the steam turbine, the first steam extraction pressure and the second steam extraction pressure signals output an opening instruction of a regulating valve, and the control instruction carries out electrohydraulic conversion through a servo valve and a slide valve to drive a hydraulic actuating mechanism, namely a servomotor to regulate the opening of a steam valve.
The steam inlet flow signals of all cylinders are input into a decoupling control system, and static decoupling control of the supercritical intermediate reheating unit is realized under the action of a decoupling control coefficient; namely, under the disturbance of the electric load, the thermal load of the generator set is kept unchanged after the response is completed; under the disturbance of the thermal load, the output power of the generator set is kept unchanged after the response is completed. Dynamic interference exists in the response process, and the dynamic interference is unavoidable.
The thermal decoupling control adopts a negative feedback regulation mode, the deviation of the actual extraction pressure and the rated extraction pressure and the deviation of the rotating speed are input into the neural network controller, and the oscillation and long-time instability phenomenon generated by multivariable coupling can be effectively avoided by adopting the feedback regulation mode; the design of the fuzzy PID parameter setter needs to determine the structure of the fuzzy controller, namely, the input variable and the output variable (namely, the control quantity) of the fuzzy controller, and the fuzzy PID parameter setter is a two-input three-output Mamdani fuzzy reasoning system; after the deviation signals of the rotating speed and the steam extraction pressure pass through the controller and the feedforward controller module, determining the valve opening of the high-pressure valve and the medium-pressure valve, controlling the valve opening by using the oil motor as an executing mechanism under the action of the servo valve oil motor, and increasing the steam inlet flow of each corresponding cylinder when the valve opening is increased; otherwise, the number is reduced.
The embodiment of the invention discloses a thermal decoupling control method of a double-extraction supercritical intermediate reheat unit, which comprises the following steps of; the control method for realizing the thermal decoupling control under the disturbance conditions of the electric load and the thermal load comprises the following steps:
(1) The thermal load remains unchanged when the electrical load is disturbed. When the electric load increases, the coordination control system responds to the increase of the electric load, the steam inlet flow of each cylinder needs to be improved, and under the action of the decoupling control system, the steam inlet flow of the high-pressure cylinder, the middle-pressure cylinder and the low-pressure cylinder is increased by increasing the opening degrees of the high-pressure regulating valve and the middle-pressure regulating valve. In order to respond to the increase of the electric load and ensure that the pressure of the first steam extraction and the second steam extraction is unchanged, under the action of a thermoelectric decoupling system, the opening of a high-pressure valve and a medium-pressure valve is required to be increased, and the decoupling control of the electric load and the thermal load of the supercritical intermediate reheating unit is completed; conversely, when the electric load decreases, the valve opening amounts of the high-pressure valve and the medium-pressure valve are reduced. Therefore, the control strategy realizes that the thermal load is kept at a constant value, the sum of the work of each cylinder is increased to respond to the increase of the electric load, the work capability of the unit is increased to respond to the requirement of the electric load under the disturbance of the electric load, the dynamic interference of the thermal load and the electric load exists in the dynamic adjustment process, but the thermal load is kept unchanged after the response is finished, and the static decoupling of the thermal load and the electric load is realized.
(2) The first extraction flow is disturbed, and the second extraction flow and the electric load are unchanged. When the steam extraction amount of the first steam extraction is increased, in order to keep the second steam extraction parameters and the power generator set constant in function, the opening degree of the high-pressure valve is required to be increased, the middle-pressure valve is kept constant, and the steam extraction pressure of the middle-pressure cylinder is kept constant by controlling the increased steam inlet amount of the high-pressure valve to be consistent with the increased amount of the first steam extraction flow, so that the parameters of the second steam extraction are kept constant. On the contrary, when the first steam extraction amount is reduced, the opening of the high-pressure regulating valve is reduced, so that the second steam extraction parameters and the electric load are kept unchanged after the response is completed, and the static decoupling control of the electric load and the thermal load is realized.
(3) The second extraction flow is disturbed, and the first extraction flow and the electric load remain unchanged. When the second steam extraction flow rate is increased, in order to realize that the first steam extraction and the electric load are kept unchanged, the opening of the high-pressure regulating valve and the opening of the medium-pressure regulating valve are required to be increased, when the opening of the high-pressure regulating valve is increased, the steam inlet flow rate of the high-pressure cylinder is increased, so that the air extraction parameters meeting the first steam extraction are kept unchanged, and meanwhile, the opening of the medium-pressure valve is increased, the steam inlet flow rate of the medium-pressure cylinder is improved, and when the second steam extraction flow rate is increased, the steam inlet flow rate of the low-pressure cylinder is reduced, so that the electric load is kept unchanged. Conversely, when the second steam extraction flow is reduced, under the action of the decoupling control system, the opening degrees of the high-pressure valve and the medium-pressure valve are reduced, so that the first steam extraction parameters and the electric load are kept unchanged after the response is completed.
The method of the embodiment of the invention has the core invention points that in view of the problems that the current supercritical extraction steam turbine adopts a series PI regulator to realize the loop control of a high-pressure regulating valve and a low-pressure regulating valve, the precision is insufficient, the control effect is poor, the operation parameters of the unit can weaken the control effect of thermal decoupling when the unit operates in a variable working condition, and the like; aiming at the supercritical double-extraction turbine unit, the invention provides a thermal decoupling control strategy based on a fuzzy self-adaptive PID controller, overcomes the problem of insufficient model precision in the prior art, adopts self-adaptive PID control to adjust PID parameters in real time, solves the problem of failure of the conventional PID control effect under variable working conditions, controls the opening of a high-pressure regulating valve and a medium-pressure regulating valve under the action of a thermal decoupling control system, and realizes static decoupling control of electric load and thermal load. Dynamic interference of the electric load and the thermal load cannot be eliminated under the dynamic state, but after the response is completed, static interference of the electric load and the thermal load is eliminated, and static decoupling control of the electric load and the thermal load is realized.
Illustratively, the thermocouple control system is a double-extraction turbine thermocouple control, and the controlled quantities are an electric load, a high-pressure heat load and a medium-pressure heat load, which are respectively characterized by the turbine rotating speed, the high-pressure cylinder exhaust pressure and the medium-pressure cylinder exhaust pressure. The double-extraction turbine thermal decoupling control adopts a rotating speed and pressure negative feedback regulation mode, so that the electric load deviation and the thermal load deviation of each cylinder are input into a fuzzy self-adaptive PID controller, and PID parameters are regulated in real time based on the fuzzy self-adaptive PID controller; the deviation signals of the electric load and the thermal load comprise rotating speed deviation, first steam extraction pressure deviation and second steam extraction pressure deviation, the deviation signals are input into a fuzzy self-adaptive PID controller, deviation variation of the rotating speed and the pressure is obtained under the action of d/dt differentiation in the controller, the rotating speed, the deviation of the first steam extraction pressure and the second steam extraction pressure and the deviation variation are jointly input into a Mamdani fuzzy reasoning system under the action of quantization factors, the valve opening of a high-pressure valve and a medium-pressure valve is determined by a controller function, when the rotating speed, the first steam extraction pressure and the second steam extraction pressure are not deviated in the adjusting process, the controller does not act any more, and the output adjusting instruction is a final adjusting instruction of the high-pressure valve and the medium-pressure valve, the high-pressure valve and the medium-pressure valve adopt a feedback control mode, and the valve opening does not change any more when the adjusting instruction of the high-pressure valve and the valve opening deviation is 0. Therefore, the thermocouple control system inputs the rotating speed, the first steam extraction pressure and the second steam extraction pressure, and under the action of the controller, the opening degree of the valve is controlled, and the adjustment instructions of the high-pressure valve and the medium-pressure valve are output. Each regulating valve receives a valve opening regulating instruction and regulates the valve opening through the oil motor. When the opening of the valve is increased, the corresponding steam inlet flow of each cylinder is increased; otherwise, the number is reduced.
Referring to fig. 3, fig. 3 is a simplified diagram of a fuzzy adaptive PID controller. The design of the fuzzy self-adaptive PID controller mainly comprises the following steps:
firstly, determining preset PID parameters; designing a fuzzy PID parameter setter according to a design method of a conventional fuzzy controller; and designing a fuzzy self-adaptive PID controller.
The design of the fuzzy PID parameter setter needs to determine the structure of the fuzzy controller, namely, the input variable and the output variable (namely, the control quantity) of the fuzzy controller, and the fuzzy PID parameter setter is a two-input three-output Mamdani fuzzy reasoning system.
E is the deviation and ec is the deviation variation, which can be expressed as:
Wherein: r (k) and r0 are the frequency and the frequency given value at the kth sampling time, respectively, and Δt is the sampling period. Ke is the quantization factor of the deviation, kec is the quantization factor of the deviation variation; e and Ec are inputs of a fuzzy inference system, cp, ci and Cd are outputs of the fuzzy inference system; fp, fi and Fd are functional expressions, and kp, ki and kd in ：Fp＝kp+cp·kp,Fi＝ki+ci·ki,Fd＝kd+cd·kd, are preset values of the PID controller.
The design of the control rule is the key of designing the fuzzy controller, and generally comprises three parts of design contents:
first, selecting word sets describing input and output variables;
Second, defining fuzzy subsets of fuzzy variables;
thirdly, establishing a control rule of the fuzzy controller.
The design tool of the fuzzy inference system adopted by the invention is an MATLAB fuzzy logic tool box, a 'fuzzy' command is input into an MATLAB command window, a design interface is entered, and the design work of the fuzzy inference system is started.
In the application of the invention, the rotational speed deviation e n, the first extraction pressure deviation e p1 and the second extraction pressure deviation e p2 are input into a fuzzy self-adaptive PID controller, under the action of differential d/dt in the controller, the rotational speed deviation variable quantity ec n, the first extraction pressure deviation variable quantity ec p1 and the second extraction pressure deviation variable quantity ec p2 are obtained, each deviation and deviation variable quantity is input into a Mamdani fuzzy reasoning system under the action of corresponding quantization factors, the output of the system under the action of function expressions Fp, fi and Fd, the valve instructions of a high-pressure valve and a medium-pressure valve are obtained, and as the three control loops of the rotational speed, the first extraction pressure and the second extraction pressure have the same control rules, the invention provides a simplified model of a control loop in order to avoid repetition.
Referring to fig. 4, fig. 4 is a block diagram of a servo valve engine. The high-pressure valve and the medium-pressure valve in the generator set adopt the structure, and the opening instruction of the regulating valve is output after passing through the feedforward compensator, and the control instruction carries out electrohydraulic conversion through the servo valve and the slide valve to drive the hydraulic actuating mechanism, namely the oil motor to regulate the opening of the steam valve. Wherein, the difference between the valve opening command signal and the actual valve opening command signal controls the electrohydraulic servo valve. The electrohydraulic servo valve converts the electric signal of the servo card into a hydraulic signal, and the output of the electrohydraulic servo valve also has a limiting value, so the electrohydraulic servo valve has a limiting characteristic.
The servo system receives the command CV of the regulating valve to control the opening or closing of the regulating valve through the oil motor, and controls the upper limit and the lower limit of the stroke of the oil motor and the movement speed of an executing mechanism thereof respectively through a limiting link and a speed limiting link, thereby having a guarantee meaning for the stable and safe operation of the servo system.
After receiving the regulating command, the high-pressure regulating valve and the low-pressure regulating valve control the steam inflow of each cylinder, when the electric load fluctuates or the thermal load fluctuates, under the action of a thermoelectric decoupling control system, dynamic interference exists between the load and the thermal load in the dynamic response process, and static decoupling control is realized after the response is completed. That is, under the disturbance of the electric load, after the response is completed, the thermal load can be restored to the rated value, and the output force of the generator is consistent with the fluctuation amount of the electric load; when the first steam extraction load is disturbed, the coordination control system responds to the change of the thermal load by controlling the opening of the regulating valve, and after the response is completed, the electric load and the second steam extraction parameters are kept unchanged.
The following are device embodiments of the present invention that may be used to perform method embodiments of the present invention. For details of the device embodiment that are not careless, please refer to the method embodiment of the present invention.
The embodiment of the invention provides a thermoelectric decoupling control system of a double-extraction supercritical intermediate reheat unit, which comprises the following components:
the deviation acquisition module is used for acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of the steam turbine;
the valve instruction acquisition module is used for inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into the fuzzy self-adaptive PID controller, and outputting valve instructions of the high-pressure valve and the medium-pressure valve through the fuzzy self-adaptive PID controller;
And the decoupling execution module is used for realizing the thermal decoupling control of the double-extraction supercritical intermediate reheating unit based on the high-pressure valve and medium-pressure valve instructions.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (3)
1. The thermal decoupling control method of the double-extraction supercritical intermediate reheating unit is characterized by comprising the following steps of:
Acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of a steam turbine of a double extraction supercritical intermediate reheat unit;
Inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and outputting high-pressure valve and medium-pressure valve instructions through the fuzzy self-adaptive PID controller;
Based on the high-pressure valve and medium-pressure valve instructions, the thermal decoupling control of the double-extraction supercritical intermediate reheating unit is realized;
Wherein, two extraction supercritical intermediate reheat unit includes: a steam turbine module; the turbine module includes: a high pressure cylinder, a medium pressure cylinder and a low pressure cylinder; the exhaust steam of the high-pressure cylinder is divided into two parts, wherein one part is the first extraction steam, and the other part enters a boiler for reheating and heating; the heated steam enters the medium pressure cylinder to expand and do work; the exhaust steam of the medium pressure cylinder is divided into two parts, wherein one part is second extraction steam, and the other part enters the low pressure cylinder to expand and do work;
The step of inputting the turbine rotation speed deviation, the first extraction pressure deviation and the second extraction pressure deviation into a fuzzy self-adaptive PID controller and outputting the high-pressure valve and the medium-pressure valve instructions through the fuzzy self-adaptive PID controller specifically comprises the following steps: inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and obtaining a rotating speed deviation variable quantity, a first steam extraction pressure deviation variable quantity and a second steam extraction pressure deviation variable quantity under the action of differential d/dt in the controller; the deviation and the deviation variation are input into a Mamdani fuzzy inference system under the action of corresponding quantization factors, and the output of the system outputs valve instructions of a high-pressure valve and a medium-pressure valve under the action of function expressions Fp, fi and Fd; wherein the parameter setter of the fuzzy self-adaptive PID controller is a two-input three-output Mamdani fuzzy reasoning system expressed as e (k) =r (k) -r 0, Wherein, r (k) and r 0 are the frequency and the frequency given value of the kth sampling time respectively; Δt is the sampling period; ke is the quantization factor of the deviation; kec is the quantization factor of the variation of the deviation; e is deviation, ec is deviation change, and the deviation is used as input of a fuzzy reasoning system; cp, ci and Cd are used as the output of the fuzzy inference system; fp, fi and Fd are preset values of the fuzzy self-adaptive PID controller, wherein the function expression is Fp＝kp+cp·kp、Fi＝ki+ci·ki、Fd＝kd+cd·kd,kp、ki、kd;
The step of realizing the thermal decoupling control of the double-extraction supercritical intermediate reheat unit based on the high-pressure valve and medium-pressure valve commands specifically comprises the following steps: based on the high-pressure valve and the medium-pressure valve, valve command realization: (1) Under the disturbance of the electric load, the thermal load of the generator set remains unchanged after the response is completed; (2) Under the disturbance of the thermal load, the output power of the generator set remains unchanged after the response is completed;
Under the electric load disturbance, the thermal load of the generator set after the response is completed is kept unchanged, and the method specifically comprises the following steps: when the electric load is increased, opening degrees of the high-pressure valve and the medium-pressure valve are increased based on valve instructions of the high-pressure valve and the medium-pressure valve, so that steam inflow rates of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are increased, and the thermal load of the generator set is kept unchanged after response is completed; when the electric load is reduced, opening degrees of the high-pressure valve and the medium-pressure valve are reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, so that steam inflow rates of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are reduced, and the thermal load of the generator set is kept unchanged after response is completed;
Under the thermal load disturbance, the output power of the generator set remains unchanged after the response is completed, and the method specifically comprises the following steps: when the first steam extraction flow rate is increased, the opening of the high-pressure valve is increased based on valve instructions of the high-pressure valve and the medium-pressure valve, and the opening of the medium-pressure valve is kept unchanged, so that the increasing amount of the steam inlet of the high-pressure valve is consistent with the increasing amount of the first steam extraction flow rate, the steam extraction pressure of the medium-pressure cylinder is kept unchanged, and the output power of the generator set is kept unchanged after the response is completed; when the first steam extraction flow is reduced, reducing the opening of the high-pressure valve based on valve instructions of the high-pressure valve and the medium-pressure valve, and keeping the opening of the medium-pressure valve unchanged, so that the reduction of the steam inlet quantity of the high-pressure valve is consistent with the reduction of the first steam extraction flow, the steam extraction pressure of the medium-pressure cylinder is kept unchanged, and the output power of the generator set is kept unchanged after the response is completed;
Under the thermal load disturbance, the output power of the generator set remains unchanged after the response is completed, and the method specifically comprises the following steps: when the second steam extraction flow rate is increased, opening degrees of the high-pressure valve and the medium-pressure valve are increased based on valve instructions of the high-pressure valve and the medium-pressure valve, so that the output power of the generator set is kept unchanged after the response is completed; and when the second steam extraction flow is reduced, opening degrees of the high-pressure valve and the medium-pressure valve are reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, so that the output power of the generator set is kept unchanged after the response is finished.
2. The method for controlling the thermal decoupling of the double-extraction supercritical intermediate reheat unit according to claim 1, wherein the step of implementing the thermal decoupling control of the double-extraction supercritical intermediate reheat unit based on the valve commands of the high pressure valve and the medium pressure valve specifically comprises the following steps:
Valve instructions of the high-pressure valve and the medium-pressure valve are subjected to electrohydraulic conversion through a servo valve and a slide valve, so that a driving instruction is obtained;
and based on the driving instruction, driving a hydraulic actuating mechanism to adjust the opening degrees of the high-pressure valve and the medium-pressure valve, so as to realize the thermal decoupling control of the double-extraction supercritical intermediate reheating unit.
3. The thermoelectric decoupling control system of the double-extraction supercritical intermediate reheat unit is characterized by comprising the following components:
the deviation acquisition module is used for acquiring the rotating speed deviation, the first extraction pressure deviation and the second extraction pressure deviation of the steam turbine;
the valve instruction acquisition module is used for inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into the fuzzy self-adaptive PID controller, and outputting valve instructions of the high-pressure valve and the medium-pressure valve through the fuzzy self-adaptive PID controller;
The decoupling execution module is used for realizing the thermal decoupling control of the double-extraction supercritical intermediate reheating unit based on the high-pressure valve and medium-pressure valve instructions;
Wherein, two extraction supercritical intermediate reheat unit includes: a steam turbine module; the turbine module includes: a high pressure cylinder, a medium pressure cylinder and a low pressure cylinder; the exhaust steam of the high-pressure cylinder is divided into two parts, wherein one part is the first extraction steam, and the other part enters a boiler for reheating and heating; the heated steam enters the medium pressure cylinder to expand and do work; the exhaust steam of the medium pressure cylinder is divided into two parts, wherein one part is second extraction steam, and the other part enters the low pressure cylinder to expand and do work;
The step of inputting the turbine rotation speed deviation, the first extraction pressure deviation and the second extraction pressure deviation into a fuzzy self-adaptive PID controller and outputting the high-pressure valve and the medium-pressure valve instructions through the fuzzy self-adaptive PID controller specifically comprises the following steps: inputting the rotating speed deviation, the first steam extraction pressure deviation and the second steam extraction pressure deviation of the steam turbine into a fuzzy self-adaptive PID controller, and obtaining a rotating speed deviation variable quantity, a first steam extraction pressure deviation variable quantity and a second steam extraction pressure deviation variable quantity under the action of differential d/dt in the controller; the deviation and the deviation variation are input into a Mamdani fuzzy inference system under the action of corresponding quantization factors, and the output of the system outputs valve instructions of a high-pressure valve and a medium-pressure valve under the action of function expressions Fp, fi and Fd; wherein the parameter setter of the fuzzy self-adaptive PID controller is a two-input three-output Mamdani fuzzy reasoning system expressed as e (k) =r (k) -r 0, Wherein, r (k) and r 0 are the frequency and the frequency given value of the kth sampling time respectively; Δt is the sampling period; ke is the quantization factor of the deviation; kec is the quantization factor of the variation of the deviation; e is deviation, ec is deviation change, and the deviation is used as input of a fuzzy reasoning system; cp, ci and Cd are used as the output of the fuzzy inference system; fp, fi and Fd are preset values of the fuzzy self-adaptive PID controller, wherein the function expression is Fp＝kp+cp·kp、Fi＝ki+ci·ki、Fd＝kd+cd·kd,kp、ki、kd;
The step of realizing the thermal decoupling control of the double-extraction supercritical intermediate reheat unit based on the high-pressure valve and medium-pressure valve commands specifically comprises the following steps: based on the high-pressure valve and the medium-pressure valve, valve command realization: (1) Under the disturbance of the electric load, the thermal load of the generator set remains unchanged after the response is completed; (2) Under the disturbance of the thermal load, the output power of the generator set remains unchanged after the response is completed;
Under the electric load disturbance, the thermal load of the generator set after the response is completed is kept unchanged, and the method specifically comprises the following steps: when the electric load is increased, opening degrees of the high-pressure valve and the medium-pressure valve are increased based on valve instructions of the high-pressure valve and the medium-pressure valve, so that steam inflow rates of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are increased, and the thermal load of the generator set is kept unchanged after response is completed; when the electric load is reduced, opening degrees of the high-pressure valve and the medium-pressure valve are reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, so that steam inflow rates of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are reduced, and the thermal load of the generator set is kept unchanged after response is completed;
Under the thermal load disturbance, the output power of the generator set remains unchanged after the response is completed, and the method specifically comprises the following steps: when the first steam extraction flow rate is increased, the opening of the high-pressure valve is increased based on valve instructions of the high-pressure valve and the medium-pressure valve, and the opening of the medium-pressure valve is kept unchanged, so that the increasing amount of the steam inlet of the high-pressure valve is consistent with the increasing amount of the first steam extraction flow rate, the steam extraction pressure of the medium-pressure cylinder is kept unchanged, and the output power of the generator set is kept unchanged after the response is completed; when the first steam extraction flow is reduced, reducing the opening of the high-pressure valve based on valve instructions of the high-pressure valve and the medium-pressure valve, and keeping the opening of the medium-pressure valve unchanged, so that the reduction of the steam inlet quantity of the high-pressure valve is consistent with the reduction of the first steam extraction flow, the steam extraction pressure of the medium-pressure cylinder is kept unchanged, and the output power of the generator set is kept unchanged after the response is completed;
Under the thermal load disturbance, the output power of the generator set remains unchanged after the response is completed, and the method specifically comprises the following steps: when the second steam extraction flow rate is increased, opening degrees of the high-pressure valve and the medium-pressure valve are increased based on valve instructions of the high-pressure valve and the medium-pressure valve, so that the output power of the generator set is kept unchanged after the response is completed; and when the second steam extraction flow is reduced, opening degrees of the high-pressure valve and the medium-pressure valve are reduced based on valve instructions of the high-pressure valve and the medium-pressure valve, so that the output power of the generator set is kept unchanged after the response is finished.
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