CN110761851A - Simulation method and device for turbine power and electronic equipment - Google Patents
Simulation method and device for turbine power and electronic equipment Download PDFInfo
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- CN110761851A CN110761851A CN201911043236.2A CN201911043236A CN110761851A CN 110761851 A CN110761851 A CN 110761851A CN 201911043236 A CN201911043236 A CN 201911043236A CN 110761851 A CN110761851 A CN 110761851A
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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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
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/76—Application in combination with an electrical generator
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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
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- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a simulation method, a device and electronic equipment for turbine power, wherein the method comprises the steps of firstly obtaining a comparative power increment of a generator based on the rated frequency of a turbine, the load of the generator and the total resistance value of the generator, then inputting the power comparative increment and an angular frequency difference value into a speed regulator for calculation to obtain a power difference of the speed regulator, then inputting the power difference of the speed regulator into a hydraulic amplifier for processing to obtain an opening power difference of a main steam valve, and finally calculating a mechanical rotation power difference generated by a turbine rotor in the rotation process based on the inherent delay time of the equipment. According to the simulation method, the delay time parameter is introduced, so that the time delay existing in the process of inputting the main steam into the rotor is compensated, the problem of turbine system oscillation caused by response quantity overshoot or asynchronous response speed is solved, and the frequency modulation result of the generator side is improved.
Description
Technical Field
The invention relates to the technical field of steam turbine generators, in particular to a simulation method and device of steam turbine power and electronic equipment.
Background
When the unit generator power load suddenly increases, the power load may exceed the mechanical torque power input. The mechanical torque power deficiency is caused by the insufficient kinetic energy stored by the turbine rotor, the rotational speed of the turbine is reduced due to the insufficient kinetic energy, the frequency of the generator is reduced at the same time, the speed change is sensed by the speed regulator, the speed regulator inputs an 'opening' command through difference calculation to provide more steam for the main steam valve so as to improve the input of the mechanical torque power, and the turbine rotor reaches a new synchronous rotational speed, and the process is simply called as a steady state. In the process of realizing the steady state by adopting the speed regulator, the centralized controller is mainly used at the power generation side at present, the real steady state is difficult to be realized by the difference value calculation sensed by the speed regulator, the system oscillation is also caused by the overshoot of the response quantity or the asynchronous response speed, the frequency modulation result at the power generator side is often not satisfactory, and the result required by the system is difficult to be realized.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for simulating turbine power, and an electronic device. According to the simulation method, the opening power difference of the main steam valve is obtained by calculating the comparative power increment and the angular frequency difference of the speed regulator, the delay time parameter is introduced to compensate the time delay existing in the process that the main steam is input into the rotor to output mechanical energy, and the mechanical rotation power difference generated by the main steam working on the generator rotor is finally obtained, so that the purpose that the real stable state is achieved by calculating the difference sensed by the speed regulator is achieved, the problem that the turbine system vibrates when the response quantity is over-regulated or the response speed is asynchronous is solved, and the frequency regulation result of the generator side is improved.
In a first aspect, an embodiment of the present invention provides a method for simulating turbine power, where the method includes:
obtaining a comparative power increment of the generator based on the rated frequency of the steam turbine, the load of the generator and the total resistance value of the generator;
inputting the power comparison increment and the angular frequency difference value into a speed regulator for calculation to obtain the power difference of the speed regulator;
inputting the power difference of the speed regulator into a hydraulic amplifier for processing to obtain the opening power difference of the main steam valve; the opening power difference of the main steam valve is used for driving a steam pipeline to convey steam impact force so as to enable a steam turbine rotor to rotate;
and calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time.
In some embodiments, the step of deriving the comparative power increment of the generator based on the rated frequency of the steam turbine, the generator load, and the total generator resistance value includes:
obtaining a damping factor according to the rated frequency of the steam turbine and the load of the generator;
calculating the power load variation of the generator according to the rated frequency of the steam turbine, the damping factor and the total resistance value of the generator;
a comparative power increment for the generator is derived based on the power load delta for the generator.
In some embodiments, the step of obtaining the comparative power increment of the generator based on the power load variation of the generator includes:
calculating the power output increment of each generator according to the power load variation of the generator, the declination value of the speed regulator, the damping factor and the total resistance value of the generator;
a comparative power increment for the generators is derived based on the power output increments for each generator.
In some embodiments, the variation amount of the power load of the generator, the declination value of the speed regulator, the damping factor and the total resistance value R of the generator are determined according to the variation amount of the power load of the generator, the declination value of the speed regulator, the damping factor and the total resistance value R of the generatoreffThe step of calculating the power output increment for each generator includes:
where Δ P represents the power output increment of each generator, Δ L represents the power load variation of the generator, and DeffRepresenting the damping factor, RiIndicating the downtilt value of the governor, ReffRepresenting the total resistance of the generator.
In some embodiments, the step of inputting the power difference of the speed regulators to the hydraulic amplifier for processing to obtain the opening power difference of the main steam valve includes:
inputting the power difference of the speed regulator into a hydraulic amplifier;
calculating the power difference of the speed regulator and a preset time constant through a hydraulic amplifier to obtain the opening power difference of the main steam valve; wherein, the aperture power difference of main steam valve is:
τgdenotes a preset time constant and s denotes the s domain.
In some embodiments, the steam turbine includes a steam turbine prime mover that does not include a reheat section, and the predetermined delay time includes a time T corresponding to the steam turbine prime mover that does not include a reheat sectiont；
The step of calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time comprises the following steps:
a mechanical rotational power difference generated during rotation of a rotor of the steam turbine prime mover without the reheat section is calculated based on a time corresponding to the steam turbine prime mover without the reheat section.
In some embodiments, the step of calculating the mechanical rotational power difference generated by the turbine rotor during rotation based on the predetermined delay time comprises:
the mechanical rotational power difference generated by the rotor of the steam turbine prime mover containing the reheat section during rotation is calculated based on the time constant corresponding to the steam turbine prime mover containing the reheat section.
In some embodiments, the steam turbine includes a gas engine prime mover, and the predetermined delay time includes a time corresponding to a gas inlet valve and a time corresponding to a prototype of the engine;
the step of calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time comprises the following steps:
and calculating the mechanical rotation power difference generated by the rotor of the prime mover of the gas internal combustion engine in the rotation process based on the time corresponding to the gas inlet valve and the time corresponding to the prototype of the internal combustion engine.
In some embodiments, the steam turbine includes a turbine prime mover, and the step of calculating a mechanical rotation power difference generated by a rotor of the steam turbine during rotation based on a preset delay time includes:
and calculating a mechanical rotation power difference generated by a rotor of a prime mover of the water turbine during rotation based on the corresponding time parameter of the water turbine.
In a second aspect, an embodiment of the present invention provides a simulation apparatus for turbine power, where the apparatus includes:
the comparative power increment calculation module is used for obtaining the comparative power increment of the generator based on the rated frequency of the steam turbine, the load of the generator and the total resistance value of the generator;
the power increment difference value calculating module is used for inputting the power comparison increment and the angular frequency difference value into the speed regulator for calculation to obtain the power difference of the speed regulator;
the main steam valve position instruction output module is used for inputting the power difference of the speed regulator to the hydraulic amplifier for processing to obtain the opening power difference of the main steam valve; the opening power difference of the main steam valve is used for driving a steam pipeline to convey steam impact force so as to enable a steam turbine rotor to rotate;
and the steam turbine power calculation module is used for calculating the mechanical rotation power difference generated by the steam turbine rotor in the rotation process based on the preset delay time.
In a third aspect, an embodiment of the present invention provides an electronic device, including: a processor and a storage device; the storage device has stored thereon a computer program which, when executed by the processor, performs the method of any of the first aspects.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs the steps of the method in any one of the above first aspects.
The embodiment of the invention has the following beneficial effects: the embodiment of the invention provides a simulation method, a simulation device and electronic equipment for power of a steam turbine. Inputting the power difference of the speed regulator into a hydraulic amplifier for processing to obtain the opening power difference of the main steam valve; the opening power difference of the main steam valve is used for driving a steam pipeline to convey steam flushing power so as to enable a steam turbine rotor to rotate. And finally, calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time. According to the simulation method, the opening power difference of the main steam valve is obtained by calculating the comparative power increment and the angular frequency difference of the speed regulator, the delay time parameter is introduced to compensate the time delay existing in the process that the main steam is input into the rotor to output mechanical energy, and the mechanical rotation power difference generated by the main steam working on the generator rotor is finally obtained, so that the purpose that the real stable state is achieved by calculating the difference sensed by the speed regulator is achieved, the problem that the turbine system vibrates when the response quantity is over-regulated or the response speed is asynchronous is solved, and the frequency regulation result of the generator side is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for simulating turbine power provided in an embodiment of the present invention;
FIG. 2 is a flow chart of step S101 of a method for simulating turbine power according to an embodiment of the present invention;
FIG. 3 is a flowchart of step S203 of a method for simulating turbine power according to an embodiment of the present invention;
FIG. 4 is a flowchart of step S103 of a method for simulating turbine power according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a simulation module of a speed governor provided by an embodiment of the present invention;
FIG. 6 is a schematic illustration of a simulation of a steam turbine prime mover without a reheat section provided by an embodiment of the present invention;
FIG. 7 is a schematic illustration of a simulation of a steam turbine prime mover including a reheat section provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of a simulation of a gas combustion engine prime mover provided in accordance with an embodiment of the present invention;
fig. 9 is a schematic simulation diagram of a water turbine prime mover provided in an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an apparatus for simulating turbine power according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Icon:
1001-comparison power increment calculation module; 1002-a power increment difference calculation module; 1003-main steam valve position instruction output module; 1004-a turbine power calculation module; 101-a processor; 102-a memory; 103-a bus; 104-communication interface.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When the generator power load suddenly increases, the power load may exceed the mechanical torque power input. The mechanical torque power deficiency is caused by the insufficient kinetic energy stored by the turbine rotor, the rotational speed of the turbine is reduced due to the insufficient kinetic energy, the frequency of the generator is reduced at the same time, the speed change is sensed by the speed regulator, the speed regulator inputs an 'opening' command through difference calculation to provide more steam for the main steam valve so as to improve the input of the mechanical torque power, and the turbine rotor reaches a new synchronous rotational speed, and the process is simply called as a steady state. In the process of realizing the steady state by adopting the speed regulator, the centralized controller is mainly used at the power generation side at present, the real steady state is difficult to be realized by the difference value calculation sensed by the speed regulator, the system oscillation is also caused by the overshoot of the response quantity or the asynchronous response speed, the frequency modulation result at the power generator side is often not satisfactory, and the result required by the system is difficult to be realized.
Considering that in the process of realizing the steady state by adopting the speed regulator, the real steady state is difficult to be realized by the difference value calculation sensed by the speed regulator, and the system oscillation is also caused by the overshoot of the response quantity or the asynchronous response speed, so that the frequency modulation result at the side of the generator is often unsatisfactory, the invention aims to provide a simulation method, a device and electronic equipment for the power of the steam turbine.
To facilitate understanding of the present embodiment, a detailed description will be first provided for a simulation method of turbine power disclosed in the present embodiment, where a flowchart of the method is shown in fig. 1, and the method includes the following steps:
and step S101, obtaining comparative power increment of the generator based on the rated frequency of the steam turbine, the load of the generator and the total resistance value of the generator.
The steam turbine generator is a generator device based on steam turbine driving, and most of steam generated by a boiler enters a steam turbine to be expanded and do work, so that blades of the steam turbine rotate to drive a motor to generate power.
The rated power of the turbine reflects the operating capacity of the turbine, and the operating conditions of the turbine can be represented by the parameter. Generally, in a simulation process, long-time running operation is taken as an optimal design point, the process is called as a normal working condition, and power under the normal working condition becomes normal power. Under normal working conditions, the rated power of the steam turbine is generally 1.1 times of the power under the normal working conditions, so that the power parameters under the normal working conditions of the steam turbine can be directly obtained through the rated power of the steam turbine.
The governor is a key element that directly affects the power system frequency and the generator load distribution, and the speed, frequency and governor regulated torque power of each turbine are related to the downtilt value.
The above-mentioned declination relationship is shown in the following formula:
wherein R isiIs a declination value with the unit of Hz/MW; pgiAdjusting the torque power for the regulator; f is the frequency of the turbine.
The comparative power increment of the generator is a parameter input to the speed regulator, and the common method is to set a declination value of the speed regulator, the load change from zero to rated output changes at the same speed, and the speed change value can be set from 3% to 5%. The variable frequency speed regulation is carried out by conforming to the steady-state relation among changes, and the power output provided by the speed regulator is increased.
And S102, inputting the power comparison increment and the angular frequency difference value into the speed regulator for calculation to obtain the power difference of the speed regulator.
The speed regulating mechanism in the speed regulator mainly comprises a servo motor system, can be manually operated or automatically scheduled under the nominal power, and can schedule the required load according to the nominal frequency by adjusting the set point.
In order to stably operate, the speed regulator allows the rotating speed to be reduced along with the increase of the load, the speed regulating mechanism is used as a comparator, and the power difference of the speed regulator is obtained by adopting the following formula:
wherein, Δ PgIs the power difference of the speed regulator; delta PrefIs a comparative power increment for the generator; Δ ω is the angular frequency difference.
And step S103, inputting the power difference of the speed regulator into a hydraulic amplifier for processing to obtain the opening power difference of the main steam valve.
The power difference of the speed regulator obtained in step S102 is input to a hydraulic amplifier for processing, and the hydraulic amplifier is a power amplification device which uses pressure oil as a transmission medium and controls the high-power hydraulic power of the output end by adjusting the low-power control signal of the input end.
The opening power difference of the main steam valve in the step is used for driving a steam pipeline to convey steam impulse force so as to enable a steam turbine rotor to rotate. In the steam turbine prime mover model, main steam transmits steam power through a steam pipe so that a turbine rotor obtains kinetic energy of rotation, but a certain time delay exists between the input of main steam and the output of mechanical energy from the rotor, and therefore the delay time needs to be set in advance.
And step S104, calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time.
The delay time is set according to the different types of turbines in consideration of the delay time that needs to be set in step S103. The preset delay time is the inherent time of the equipment and is the delay time set according to the self requirements of the equipment, and the preset delay time is used for calculating the mechanical rotation power difference generated by the steam turbine rotor in the rotation process, so that the mechanical rotation power generated by the main steam acting on the generator rotor is finally obtained.
According to the simulation method of the steam turbine power, provided by the embodiment of the invention, the opening power difference of the main steam valve is obtained by calculating the comparative power increment and the angular frequency difference of the speed regulator, the delay time parameter is introduced to compensate the time delay existing in the process that the main steam is input into the rotor to output the mechanical energy, and finally the mechanical rotation power difference generated on the rotor of the generator by working the main steam is obtained, so that the difference value sensed by the speed regulator is calculated to achieve a real stable state, the problem of turbine system oscillation caused by response quantity overshoot or asynchronous response speed is solved, and the frequency modulation result of the generator side is improved.
As shown in fig. 2, in some embodiments, the step S101 further includes:
step S201, obtaining a damping factor according to the rated frequency of the steam turbine and the load of the generator.
The damping factor in the art is a parameter of the power system under the damping attenuation effect when the power system oscillates, the damping factor in this embodiment represents the sensitivity of the system load to frequency adjustment, and the damping factor is calculated by using the following equation:
wherein D iseffIs a damping factor with the unit of MW/Hz; ploadThe load power of the turbine; f is the frequency of the turbine.
And S202, calculating the power load variation of the generator according to the rated frequency of the steam turbine, the damping factor and the total resistance value of the generator.
To facilitate the analysis of the governor, all turbines and generators in this embodiment are operated at synchronous speed, and both the acceleration and frequency of the system are determined by the governor. It can be seen that at a given frequency, a change in power load will produce a steady state change.
Calculating the power load variation of the generator according to the rated frequency, the damping factor and the total resistance value of the generator of the steam turbine, and realizing the power load variation by adopting the following calculation formula:
wherein f is the frequency of the turbine;Δ L is the amount of change in load at the rated frequency; deffIs a damping factor; reffThe effective value of the resistance.
And step S203, obtaining a comparative power increment of the generator based on the power load variation of the generator.
As shown in fig. 3, in some embodiments, the step S203 further includes:
and S301, calculating the power output increment of each generator according to the power load variation of the generator, the declination value of the speed regulator, the damping factor and the total resistance value of the generator.
Specifically, the step can be calculated by the following equation:
where Δ P represents a power output increment of each of the generators, Δ L represents a power load variation of the generator, and DeffRepresenting the damping factor, RiRepresenting the downtilt value, R, of the governoreffRepresenting the total generator resistance value.
Step S302, obtaining comparative power increment of the generators based on the power output increment of each generator.
The above embodiment describes in detail the process of obtaining the comparative power increment of the generator through the rated frequency of the steam turbine, the load of the generator and the total resistance value of the generator, and the process is used for subsequent calculation.
As shown in fig. 4, in some embodiments, the step S103 further includes:
step S401, inputting the power difference of the speed regulator into a hydraulic amplifier.
The process of inputting the power difference of the speed regulator into the hydraulic amplifier obtains the power difference of the speed regulator by adopting the following calculation formula:
wherein, Δ PgIs the power difference of the speed regulator; delta PrefTo generate electricityA comparative power increment of the machine; Δ ω is the angular frequency difference.
And step S402, calculating the power difference of the speed regulator and a preset time constant through a hydraulic amplifier to obtain the opening power difference of the main steam valve.
In the equation disclosed in step S401, the output command of the comparator is transmitted and outputted to the main steam valve command through the hydraulic pressure amplifier. By introducing a time constant having a linear relationship in the present embodiment, the opening power difference of the main steam valve in the S domain is calculated by using the following equation:
τgdenotes a preset time constant and s denotes the s domain.
FIG. 5 is a schematic diagram of a simulation module of the governor, as can be seen from FIG. 5, Δ f is a parameter
Compared power increment delta P between merged power and generatorrefPerforming logical addition and subtraction to obtain power difference of speed regulator, and comparing with input
Obtaining the power difference DeltaP of the speed regulatorg。
It can be seen that the steam turbine rotor obtains kinetic energy of rotation by the method mentioned in the above embodiments by conveying the steam thrust force through the steam pipe by the main steam. There is a time delay from the main steam input to the rotor output mechanical energy. By introducing a time constant TgIt is understood that the energy storage time ranges from 0.1 second to 2 seconds. The opening power difference of the main steam valve is obtained by calculating the comparative power increment and the angular frequency difference of the speed regulator, and the delay time parameter is introduced to compensate the time delay existing in the process that the main steam is input into the rotor to output mechanical energy, so that the mechanical rotation power difference generated on the rotor of the generator by the working of the main steam is finally obtained, and the perception through the speed regulator is realizedThe difference value is calculated to achieve a real stable state, the problem of turbine system oscillation caused by response quantity overshoot or asynchronous response speed is solved, and the frequency modulation result of the generator side is improved.
In some embodiments, the step of calculating the mechanical rotational power difference generated during the rotation of the turbine rotor based on the predetermined delay time comprises: a mechanical rotational power difference generated during rotation of a rotor of the steam turbine prime mover without the reheat section is calculated based on a time corresponding to the steam turbine prime mover without the reheat section.
The concrete process is shown in FIG. 6, and simulation parameters in the steam turbine prime mover are adoptedWherein s represents an s domain; t istRepresents a time constant; pmIs the mechanical power difference.
The power difference Δ P obtained from the speed regulatorgInputting into a prime mover of a steam turbine to obtain a mechanical power difference, wherein the time constant is TtAnd Tg。
In some embodiments, the step of calculating the mechanical rotational power difference generated by the turbine rotor during rotation based on the predetermined delay time comprises: the mechanical rotational power difference generated by the rotor of the steam turbine prime mover containing the reheat section during rotation is calculated based on the time constant corresponding to the steam turbine prime mover containing the reheat section.
The concrete process is shown in FIG. 7, and simulation parameters in the steam turbine prime mover are adopted
Wherein s represents an s domain; t isω、T1、T2Represents a time constant; pmAs mechanical powerAnd (4) poor.
The power difference Δ P obtained from the speed regulatorgInputting into a prime mover of a steam turbine to obtain a mechanical power difference, wherein the time constant is Tω、T1And T2。
In some embodiments, the steam turbine includes a gas engine prime mover, and the predetermined delay time includes a time T corresponding to a gas inlet valvegvTime T corresponding to prototype of internal combustion engineoc(ii) a The step of calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time comprises the following steps: and calculating the mechanical rotation power difference generated by the rotor of the prime mover of the gas internal combustion engine in the rotation process based on the time corresponding to the gas inlet valve and the time corresponding to the prototype of the internal combustion engine.
The concrete process is shown in FIG. 8, and simulation parameters in the gas internal combustion engine are adoptedSimulation parameter adoption in internal combustion engine prototypes
Wherein s represents an s domain; t isgv、TocRespectively representing time constants corresponding to a gas inlet valve and an internal combustion engine prototype; pmIs the mechanical power difference.
The power difference Δ P obtained from the speed regulatorgInputting the power difference into a gas internal combustion engine, then inputting the power difference into an internal combustion engine prototype to finally obtain the mechanical power difference, wherein the time constant is TtAnd Tg。
In some embodiments, the steam turbine includes a turbine prime mover, and the step of calculating a mechanical rotation power difference generated by a rotor of the steam turbine during rotation based on a preset delay time includes: and calculating a mechanical rotation power difference generated by a rotor of a prime mover of the water turbine during rotation based on the corresponding time parameter of the water turbine.
The concrete process is shown in FIG. 9, and simulation parameters in the prime mover of the water turbine are adopted
The speed regulator also comprises simulation parameters of
The module of (1). Wherein s represents an s domain; t isR、TRH、TωIs a time constant; pmIs the mechanical power difference.
The above time parameter TR、TRH、TωThe following relationship also exists:
TR＝[6.0-(Tω-1.0)0.5Tω]
TM＝2H
in the embodiment, the relation between the steam turbine and the speed regulator under various working conditions is simulated by adopting a simulation method of the power of the steam turbine, the opening power difference of the main steam valve is obtained by calculating the comparison power increment and the angular frequency difference value of the speed regulator, the delay time parameter is introduced to compensate the time delay existing in the process of inputting the main steam to the rotor to output the mechanical energy, and finally the mechanical rotation power difference generated on the rotor of the generator by working the main steam is obtained, so that the purpose of achieving the real stable state through the calculation of the difference value sensed by the speed regulator is achieved, the problem of the oscillation of the steam turbine system caused by the overshoot of the response quantity or the asynchronization of the response speed is solved, and the frequency.
Corresponding to the above-described exemplary embodiment of the simulation method for turbine power, the simulation device for turbine power, which is described with reference to fig. 10, comprises:
a comparative power increment calculation module 1001, configured to obtain a comparative power increment of the generator based on a rated frequency of the steam turbine, a load of the generator, and a total resistance value of the generator;
the power increment difference value calculating module 1002 is configured to input the power comparison increment and the angular frequency difference value to the speed regulator for calculation, so as to obtain a power difference of the speed regulator;
the main steam valve position instruction output module 1003 is used for inputting the power difference of the speed regulator to the hydraulic amplifier for processing to obtain the opening power difference of the main steam valve; the opening power difference of the main steam valve is used for driving a steam pipeline to convey steam impact force so as to enable a steam turbine rotor to rotate;
and a turbine power calculating module 1004 for calculating a mechanical rotation power difference generated by the turbine rotor during the rotation process based on the preset delay time.
The simulation device of the steam turbine power provided by the embodiment of the invention has the same realization principle and technical effect as the embodiment of the simulation method of the steam turbine power, and for the sake of brief description, the corresponding content in the embodiment of the method can be referred to where the embodiment is not mentioned.
The embodiment also provides an electronic device, a schematic structural diagram of which is shown in fig. 11, and the electronic device includes a processor 101 and a memory 102; the memory 102 is configured to store one or more computer instructions, and the one or more computer instructions are executed by the processor to implement the method for simulating the turbine power.
The server shown in fig. 11 further includes a bus 103 and a communication interface 104, and the processor 101, the communication interface 104, and the memory 102 are connected through the bus 103. The server may be a network edge device.
The Memory 102 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Bus 103 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 11, but that does not indicate only one bus or one type of bus.
The communication interface 104 is configured to connect with at least one user terminal and other network units through a network interface, and send the packaged IPv4 message or IPv4 message to the user terminal through the network interface.
The processor 101 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 101. The Processor 101 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present disclosure may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present disclosure may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 102, and the processor 101 reads the information in the memory 102 and completes the steps of the method of the foregoing embodiment in combination with the hardware thereof.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs the steps of the method of the foregoing embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention or a part thereof, which essentially contributes to the prior art, can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A method of simulating turbine power, the method comprising:
obtaining a comparative power increment of the generator based on the rated frequency of the steam turbine, the load of the generator and the total resistance value of the generator;
inputting the power comparison increment and the angular frequency difference value into a speed regulator for calculation to obtain the power difference of the speed regulator;
inputting the power difference of the speed regulator into a hydraulic amplifier for processing to obtain the opening power difference of a main steam valve; the opening power difference of the main steam valve is used for driving a steam pipeline to convey steam impact force so as to enable a steam turbine rotor to rotate;
and calculating the mechanical rotation power difference generated by the turbine rotor in the rotation process based on the preset delay time.
2. The method of claim 1, wherein the step of deriving a comparative power increment for the generator based on the turbine rated frequency, the generator load, and the total generator resistance comprises:
obtaining a damping factor according to the rated frequency of the steam turbine and the load of the generator;
calculating the power load variation of the generator according to the rated frequency of the steam turbine, the damping factor and the total resistance value of the generator;
and obtaining a comparative power increment of the generator based on the power load variation of the generator.
3. The method of claim 2, wherein the step of deriving a comparative power increase for the generator based on the amount of change in the power load of the generator comprises:
calculating the power output increment of each generator according to the power load variation of the generator, the declination value of the speed regulator, the damping factor and the total resistance value of the generator;
a comparative power increment for the generators is derived based on the power output increments for each of the generators.
4. The method of claim 3, wherein the variation of the power load of the generator, the downward inclination of the speed regulator, the damping factor and the total resistance R of the generator are determined according to the variation of the power load of the generatoreffThe step of calculating the power output increment for each generator includes:
where Δ P represents a power output increment of each of the generators, Δ L represents a power load variation of the generator, and DeffRepresenting the damping factor, RiRepresenting the downtilt value, R, of the governoreffRepresenting the total generator resistance value.
5. The method of claim 1, wherein the step of inputting the governor power difference to a hydraulic amplifier for processing to obtain a main steam valve opening power difference comprises:
inputting the power difference of the speed regulator to a hydraulic amplifier;
power difference and preset time constant tau of speed regulator by hydraulic amplifiergCalculating to obtain the opening power difference delta P of the main steam valvev(ii) a Wherein, the opening power difference of the main steam valve is as follows:
τgrepresents the preset time constant and s represents the s domain.
6. The method of claim 1, wherein the steam turbine comprises a steam turbine prime mover without a reheat section, and the predetermined delay time comprises a time T corresponding to the steam turbine prime mover without the reheat sectiont；
The step of calculating a mechanical rotation power difference generated by the turbine rotor during rotation based on a preset delay time includes:
a mechanical rotational power difference generated during rotation of a rotor of the steam turbine prime mover without the reheat section is calculated based on a time corresponding to the steam turbine prime mover without the reheat section.
7. The method of claim 1, wherein the steam turbine includes a steam turbine prime mover including a reheat section, the predetermined delay time includes a time constant corresponding to the steam turbine prime mover including the reheat section, and the step of calculating the mechanical rotational power difference generated by the steam turbine rotor during rotation based on the predetermined delay time includes:
the mechanical rotational power difference generated by the rotor of the steam turbine prime mover containing the reheat section during rotation is calculated based on the time constant corresponding to the steam turbine prime mover containing the reheat section.
8. The method of claim 1, wherein the steam turbine comprises a gas internal combustion engine prime mover, and the predetermined delay time comprises a time corresponding to a gas inlet valve and a time corresponding to an internal combustion engine prototype;
the step of calculating a mechanical rotation power difference generated by the turbine rotor during rotation based on a preset delay time includes:
and calculating the mechanical rotation power difference generated by the rotor of the prime mover of the gas internal combustion engine in the rotation process based on the time corresponding to the gas inlet valve and the time corresponding to the prototype of the internal combustion engine.
9. The method of claim 1, wherein the turbine includes a turbine prime mover, and the step of calculating a mechanical rotational power difference generated by the turbine rotor during rotation based on the preset delay time includes:
and calculating a mechanical rotation power difference generated by a rotor of a prime mover of the water turbine during rotation based on the corresponding time parameter of the water turbine.
10. A simulation apparatus for turbine power, the apparatus comprising:
the comparative power increment calculation module is used for obtaining the comparative power increment of the generator based on the rated frequency of the steam turbine, the load of the generator and the total resistance value of the generator;
the power increment difference value calculating module is used for inputting the power comparison increment and the angular frequency difference value into the speed regulator for calculation to obtain the power difference of the speed regulator;
the main steam valve position instruction output module is used for inputting the power difference of the speed regulator to a hydraulic amplifier for processing to obtain the opening power difference of the main steam valve; the opening power difference of the main steam valve is used for driving a steam pipeline to convey steam impact force so as to enable a steam turbine rotor to rotate;
and the steam turbine power calculation module is used for calculating the mechanical rotation power difference generated by the steam turbine rotor in the rotation process based on the preset delay time.
11. An electronic device, comprising: a processor and a storage device;
the storage device has stored thereon a computer program which, when executed by the processor, performs the method of any of claims 1 to 9.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of the preceding claims 1 to 9.
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