CN111830831A - Control optimization method and control optimization system applying multi-term self-adaptive dynamic feedforward - Google Patents
Control optimization method and control optimization system applying multi-term self-adaptive dynamic feedforward Download PDFInfo
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Abstract
The invention relates to a control optimization method applying a multi-term self-adaptive dynamic feedforward, which comprises the following steps: step S1, obtaining a target load capacity, and converting a main steam pressure set value according to the target load capacity; step S2, detecting an actual load amount, and calculating a first correction amount; step S3, detecting the actual value of the main steam pressure, and calculating a second correction quantity according to the set value of the main steam pressure and the actual value of the main steam pressure; step S4, adding the first correction quantity and the second correction quantity to obtain a total control quantity; and step S5, adjusting the quantity of the raw materials participating in the boiler combustion according to the total control quantity. When the load of the power grid changes, the raw materials directly participating in boiler combustion are controlled by means of a control method, heat generated by boiler combustion is changed in the first time, the heat is converted into mechanical energy and electric energy in sequence and then the requirement of the load of the power grid can be met, and compared with the existing intermediate point control, the dynamic response of the boiler is quicker and can be met.
Description
Technical Field
The invention relates to the technical field of boiler control, in particular to a control optimization method and a control optimization system applying multi-term self-adaptive dynamic feedforward.
Background
Under the promotion of energy conservation and emission reduction of energy enterprises in the global scope, the traditional pulverized coal furnace is gradually eliminated, and the Circulating Fluidized Bed (CFB) boiler technology has wider fuel adaptability range and lower air pollution control cost, and has developed into one of the most successful clean coal combustion technologies for practical use.
At present, CFB (circulating fluid bed) units in China comprise subcritical parameter units (the rated gauge pressure of steam at an outlet of a superheater is 14-22.2 Mpa) and supercritical units (the rated gauge pressure of the steam at the outlet of the superheater is 22.2-31Mpa), and the power supply efficiency of the supercritical units is improved by 2.0% -2.5% compared with that of the subcritical parameter units. The subcritical parameter unit can use a drum boiler and a once-through boiler, and the supercritical boiler can only be a once-through boiler.
The traditional unit coordination control system takes an intermediate point enthalpy value as a control means, controls the heat of the intermediate point, adjusts the temperature and plays a final role in dynamic balance. But the intermediate point enthalpy adjustment is slower. The characteristics of the boiler steam side heat accumulation of the once-through boiler greatly reduced compared with a drum boiler, the working medium rigidity improved and the dynamic process accelerated determine that the once-through boiler coordination control strategy is essentially different from the traditional drum boiler, and needs faster control speed, shorter control period and stronger coordination and coordination among control subsystems such as boiler feed water, steam temperature, combustion and the like.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide a control optimization method using a multi-term adaptive dynamic feedforward, which has the advantage of fast response.
The above object of the present invention is achieved by the following technical solutions: a control optimization method applying a plurality of self-adaptive dynamic feedforward comprises the following steps:
step S1, obtaining a target load capacity, and converting a main steam pressure set value according to the target load capacity;
step S2 of detecting an actual load amount and calculating a first correction amount from the target load amount and the actual load amount;
step S3, detecting the actual value of the main steam pressure, and calculating a second correction quantity according to the set value of the main steam pressure and the actual value of the main steam pressure;
step S4, adding the first correction quantity and the second correction quantity to obtain a total control quantity;
and step S5, adjusting the quantity of the raw materials participating in the boiler combustion according to the total control quantity.
Through adopting above-mentioned technical scheme, when the electric wire netting load changes, directly participate in the raw materials of boiler burning with the help of control method and control, change the heat that the boiler burning produced in the very first time, just can accord with the demand of electric wire netting load after the heat converts mechanical energy, electric energy into in proper order, to comparing in current intermediate point control, the response is faster, can satisfy the quick dynamic response of boiler.
The present invention in a preferred example may be further configured to: the first correction amount is calculated in step S2 by the formula
Obtaining;
wherein the content of the first and second substances,
，
，
in order to achieve the target load capacity,
in order to be the actual amount of load,
as a function of the number of the coefficients,
、
is a constant of time, and is,
。
the present invention in a preferred example may be further configured to: the second correction amount is calculated in step S3 by the formula
The process for preparing a novel compound of formula (I),
,
、
as a function of the number of the coefficients,
is a constant of time, and is,
is the actual value of the main steam pressure,
is the main steam pressure set point.
The present invention in a preferred example may be further configured to: the step S1 further includes: converting a main steam pressure inertia front set value according to the target load capacity;
a step S31 is further provided between the step S3 and the step S4, and the step S31 is: calculating deviation correction according to the main steam pressure inertia front set value and the main steam pressure set value;
in step S4, the first correction amount, the second correction amount, and the deviation correction amount are added to obtain a total control amount.
By adopting the technical scheme, the inertia links of the main steam pressure inertia front set value are reduced compared with the main steam pressure inertia set value, the response speed is higher, and the displayed numerical value is more visual, so that the deviation correction calculated according to the main steam pressure inertia front set value is added, and the total control quantity can be more accurate.
The present invention in a preferred example may be further configured to: the deviation correction amount is calculated in step S31 by the formula
The process for preparing a novel compound of formula (I),
，
，
as a function of the number of the coefficients,
、
is a constant of time, and is,
,
is the main steam pressure inertia preset value.
The invention also aims to provide a control optimization system applying the multi-term self-adaptive dynamic feedforward, which has the advantage of quick response.
The second aim of the invention is realized by the following technical scheme: a control optimization system applying a plurality of self-adaptive dynamic feedforward comprises a first detection module, a second detection module, a processing center and an execution mechanism;
the first detection module is used for detecting the load of the power grid and outputting the actual load quantity;
the second detection module is used for detecting the steam pressure in the boiler and outputting a main steam pressure actual value;
and the processing center is used for receiving the target load capacity, the actual load capacity and the actual value of the main steam pressure, calculating the total control capacity through a prestored formula and controlling the execution mechanism to add raw materials in a quantity corresponding to the total control capacity into the boiler.
By adopting the technical scheme, feed-forward control is adopted, the feedback of the temperature in the boiler is skipped, and the raw materials for boiler combustion are increased and decreased in advance and are quick and corresponding.
The present invention in a preferred example may be further configured to: the processing center comprises a conversion unit, a first calculation unit, a second calculation unit and a summary unit,
the conversion unit is used for calculating a main steam pressure set value according to the target load capacity;
the first calculation unit is used for calculating a first correction quantity according to the target load quantity and the actual load quantity through a formula;
the second calculation unit is used for calculating a second correction quantity according to the main steam pressure set value and the main steam pressure actual value through a formula;
and the summarizing unit is used for acquiring the first correction quantity and the second correction quantity and adding the first correction quantity and the second correction quantity to obtain a total control quantity.
The present invention in a preferred example may be further configured to: the processing center further comprises a third calculation unit,
the conversion unit is also used for calculating a main steam pressure inertia front set value according to the target load capacity;
the third calculating unit is used for calculating deviation correction according to the main steam pressure inertia front set value and the main steam pressure set value through a formula;
and the summarizing unit is used for acquiring the first correction quantity, the second correction quantity and the deviation correction quantity and adding the first correction quantity, the second correction quantity and the deviation correction quantity to obtain a total control quantity.
By adopting the technical scheme, the main steam pressure inertia front set value is introduced, and the deviation correction is generated to further control the increase and decrease amount of the raw material, so that the control precision is higher.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the feed-forward control method is adopted, the feedback of the temperature in the boiler is skipped, and the raw materials for boiler combustion are increased and decreased in advance and correspond quickly;
2. the main steam pressure inertia preset value is introduced into the control, and deviation correction is generated to further control the increase and decrease of the raw material, so that the control precision is higher.
Drawings
FIG. 1 is a schematic diagram of a first embodiment;
fig. 2 is a structural view of the second embodiment.
In the figure, 1, a first detection module; 2. a second detection module; 3. a processing center; 31. a conversion unit; 32. a first calculation unit; 33. a second calculation unit; 34. a third calculation unit; 35. a summary unit; 4. and an actuator.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows: in a thermal power plant, a boiler heats water in the boiler by burning coal, the water in the boiler absorbs heat to form water vapor, the water vapor pushes a steam turbine to work, and the steam turbine drives a generator to rotate so as to realize power generation. In addition, the combustion of coal requires sufficient air, so that the amount of coal, air volume and water put into the boiler need to be adjusted in practice to change the load of the power grid.
The control optimization method applying the multiple self-adaptive dynamic feedforward can respectively control the coal quantity, the air quantity and the water quantity put into the boiler, and the control methods of the coal quantity, the air quantity and the water quantity are the same and only have differences on specific parameters. Therefore, the present application only describes the control method of the amount of coal as a detail description, and refers to fig. 1, which specifically includes the following steps:
and step S1, acquiring a target load quantity, and respectively converting a main steam pressure set value and a main steam pressure inertia front set value according to the target load quantity. The conversion of the target load into the main steam pressure set point is a function that exists for the conversion, this function is also called the slip pressure curve, and the slip pressure curve is basically given by the steam turbine plant design. And the difference between the main steam pressure set value and the main steam pressure inertia front set value is only the difference of inertia delay time. Therefore, only the influence of inertia delay time needs to be considered, and the main steam pressure inertia preset value can be obtained through the sliding pressure curve.
In step S2, the actual load amount is detected, and the first correction amount is calculated from the target load amount and the actual load amount.
The specific calculation mode is by means of formula
. Wherein the content of the first and second substances,
，
，
in order to achieve the target load capacity,
in order to be the actual amount of load,
as a function of the number of the coefficients,
、
is a time constant. In the present embodiment, it is preferred that,
=1，
=65sec,
=25sec。
x =0, Y = 0.5; y =0.5 when X is 0-5; when X is 5-10, the function Y at this stage is linearly changed along with X, and the value of Y is 0.7-1; when X is 10-350, Y = 1.
The difference between the target load amount and the actual load amount is calculated, and the absolute value of the difference is taken. Then bringing the absolute value into the function
In (1), obtaining the coefficient
. Meanwhile, the variation of the actual load and the current actual load within a certain inertia time is calculated, and the variation and the coefficient of the actual load are calculated
The first correction amount is obtained by multiplying. When the deviation between the target load amount and the actual load amount is larger, the fact that the total amount of the actual load amount needing to be adjusted is large is shown, and the coefficient
The value of (A) is correspondingly close toTo 1 to increase the value of the first correction amount; similarly, the larger the amount of change in the actual load amount within a certain inertia time, the larger the amount of the raw material that needs to be charged so as to satisfy the change in the actual load amount, and the higher the value of the first correction amount.
In step S3, the actual value of the main steam pressure is detected, and a second correction amount is calculated based on the set value of the main steam pressure and the actual value of the main steam pressure.
The specific calculation mode is by means of formula
The process for preparing a novel compound of formula (I),
,
、
as a function of the number of the coefficients,
is a constant of time, and is,
is the actual value of the main steam pressure,
is the main steam pressure set point. In the present embodiment, the first and second electrodes,
is a mixture of a water-soluble polymer and a water-soluble polymer, wherein the water-soluble polymer is 8,
the number of the carbon atoms is 1,
it was 40 sec.
In step S31, a deviation correction amount is calculated from the main steam pressure inertia pre-set value and the main steam pressure set value.
The specific calculation mode is by means of formula
And (4) obtaining the product. Wherein the content of the first and second substances,
，
，
as a function of the number of the coefficients,
、
is a constant of time, and is,
is the main steam pressure inertia preset value. In the present embodiment, it is preferred that,
the number of the carbon atoms is 1,
in the range of 325sec for the following reasons,
is 25 sec;
when x is less than 0, Y is 1.1, when x is greater than 0, Y is 1.1, and when x is equal to 0, Y is 1.
Calculating the variation of the main steam pressure before inertia set value in a certain inertia time, and calculating the coefficient
。
Coefficient of performance
The difference between the main steam pressure set value and the main steam pressure actual value. As long as there is a difference between the set value of the main steam pressure and the actual value of the main steam pressure, the coefficient
1.1 is obtained; the factor is only given when the set value of the main steam pressure is equal to the actual value of the main steam pressure
Will be 1.
In step S4, the first correction amount, the second correction amount, and the deviation correction amount are added to obtain a total control amount.
And step S5, adjusting the quantity of the raw materials participating in the boiler combustion according to the total control quantity. In the embodiment, because the amount of coal is controlled, the feeding speed of the coal feeder is controlled to change the speed of the coal feeder for transporting the coal to the boiler, so that the amount of the coal added into the boiler is adjusted. And for the adjustment of air quantity and water quantity, the power of the fan and the opening degree of a valve on a water supply pipe are correspondingly changed for adjustment.
Example two: referring to fig. 2, a control optimization system using a multi-term adaptive dynamic feedforward includes a first detection module 1, a second detection module 2, a processing center 3, and an actuator 4.
The first detection module 1 comprises a telemechanical engine and a data acquisition unit, the telemechanical engine is used for overcoming the limitation of the distance between a power plant and a transformer substation, the telemechanical engine acquires load information of a power grid from the transformer substation and transmits the load information to the data acquisition unit in a communication data topographic form, and the data acquisition unit analyzes the communication data and transmits an electric signal representing actual load to the processing center 3.
The second detection module 2 is a pressure transmitter for measuring the steam pressure in the main steam line and for transmitting an electrical signal representing the actual value of the main steam pressure to the processing center 3.
The processing center 3 is adapted to receive the actual load amount as well as the actual value of the main steam pressure and is also able to receive a target load amount given by the power plant. The processing center 3 includes a conversion unit 31, a first calculation unit 32, a second calculation unit 33, a third calculation unit 34, and a totaling unit 35.
And the conversion unit 31 is used for calculating a main steam pressure set value and a main steam pressure inertia set value through the target load according to a preset program.
A first calculating unit 32, configured to calculate a first correction amount according to the target load amount and the actual load amount through an equation. The formula stored in the first calculation unit 32 is
. Wherein the content of the first and second substances,
，
，
in order to achieve the target load capacity,
in order to be the actual amount of load,
as a function of the number of the coefficients,
、
is a time constant. In addition, the first and second substrates are,
、
and
the specific data of (2) are three groups, and parameters of coal quantity, air quantity and water quantity are respectively and correspondingly calculated.
、
And
when the specific parameters applied in the method are different, the calculated first correction amount is also different. Therefore, the first calculation unit 32 can actually obtain three first correction amounts, which correspond to the coal amount, the air flow rate, and the water amount, respectively.
A second calculating unit 33 for calculating a second correction amount according to the main steam pressure set value and the main steam pressure actual value by a formula. The formula stored in the second calculation unit 33 is
. Wherein the content of the first and second substances,
,
、
as a function of the number of the coefficients,
is a constant of time, and is,
is the actual value of the main steam pressure,
is the main steam pressure set point.
、
And
also having three sets of data respectively corresponding to the coal amount, the air volume, and the water amount, the second calculation unit 33 can calculate three second correction amounts respectively corresponding to the coal amount, the air volume, and the water amount.
And a third calculating unit 34 for calculating a deviation correction amount according to the main steam pressure inertia pre-set value and the main steam pressure set value through a formula. The formula stored in the third calculation unit 34 is
And (4) obtaining the product. Wherein the content of the first and second substances,
，
，
as a function of the number of the coefficients,
，
、
is a constant of time, and is,
,
is the main steam pressure inertia preset value.
、
And
the third calculation unit 34 can calculate three deviation correction amounts corresponding to the coal amount, the air volume, and the water amount, respectively.
And the summing unit 35 is used for acquiring the first correction quantity, the second correction quantity and the deviation correction quantity and adding the first correction quantity, the second correction quantity and the deviation correction quantity to obtain a total control quantity. The total control quantity of the coal quantity is obtained by adding the first correction quantity, the second correction quantity and the deviation correction quantity corresponding to the coal quantity, and the total control quantity of the air quantity and the total control quantity of the water quantity can be obtained by the same method.
The actuator 4 comprises a coal feeder for adding coal into the boiler, a fan for blowing air into the boiler, and a valve on a water supply pipe for supplying water into the boiler. The coal feeder receives the total control quantity corresponding to the quantity of coal to adjust the transmission speed of the coal feeder so as to control the quantity of the coal added into the boiler. The fan receives the total control quantity corresponding to the air quantity to change the output power so as to adjust the air quantity conveyed into the boiler. The valve on the water supply pipe receives the total control quantity corresponding to the water quantity to adjust the opening and closing degree of the valve, and the water quantity added into the boiler is controlled by changing the water quantity allowed to pass through in unit time. The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A control optimization method applying a plurality of self-adaptive dynamic feedforward is characterized by comprising the following steps:
step S1, obtaining a target load capacity, and converting a main steam pressure set value according to the target load capacity;
step S2 of detecting an actual load amount and calculating a first correction amount from the target load amount and the actual load amount;
step S3, detecting the actual value of the main steam pressure, and calculating a second correction quantity according to the set value of the main steam pressure and the actual value of the main steam pressure;
step S4, adding the first correction quantity and the second correction quantity to obtain a total control quantity;
and step S5, adjusting the quantity of the raw materials participating in the boiler combustion according to the total control quantity.
2. The method of claim 1 for control optimization using polynomial adaptive dynamic feed forward, characterized by: the first correction amount is calculated in step S2 by the formula
Obtaining;
wherein the content of the first and second substances,
，
，
in order to achieve the target load capacity,
in order to be the actual amount of load,
as a function of the number of the coefficients,
、
is a constant of time, and is,
。
3. the method of claim 1 for control optimization using polynomial adaptive dynamic feed forward, characterized by: the second correction amount is calculated in step S3 by the formula
The process for preparing a novel compound of formula (I),
,
、
as a function of the number of the coefficients,
is a constant of time, and is,
is the actual value of the main steam pressure,
is the main steam pressure set point.
4. The method of claim 1 for control optimization using polynomial adaptive dynamic feed forward, characterized by: the step S1 further includes: converting a main steam pressure inertia front set value according to the target load capacity;
a step S31 is further provided between the step S3 and the step S4, and the step S31 is: calculating deviation correction according to the main steam pressure inertia front set value and the main steam pressure set value;
in step S4, the first correction amount, the second correction amount, and the deviation correction amount are added to obtain a total control amount.
5. The method of claim 4, wherein the method comprises:
the deviation correction amount is calculated in step S31 by the formula
The process for preparing a novel compound of formula (I),
，
，
as a function of the number of the coefficients,
、
is a constant of time, and is,
，
is the main steam pressure inertia preset value.
6. A control optimization system using polynomial adaptive dynamic feedforward, characterized by: comprises a first detection module (1), a second detection module (2), a processing center (3) and an actuating mechanism (4);
the first detection module (1) is used for detecting the load of the power grid and outputting the actual load quantity;
the second detection module (2) is used for detecting the steam pressure in the boiler and outputting a main steam pressure actual value;
and the processing center (3) is used for receiving the target load capacity, the actual load capacity and the actual value of the main steam pressure, calculating the total control capacity through a prestored formula and controlling the execution mechanism (4) to add the raw materials with the quantity corresponding to the total control capacity into the boiler.
7. A control optimization system applying multi-term adaptive dynamic feedforward according to claim 6, characterized in that the processing center (3) includes a conversion unit (31), a first calculation unit (32), a second calculation unit (33) and a summary unit (35),
a conversion unit (31) for calculating a main steam pressure set value according to the target load amount;
a first calculation unit (32) for calculating a first correction amount by a formula based on the target load amount and the actual load amount;
a second calculating unit (33) for calculating a second correction amount according to the main steam pressure set value and the main steam pressure actual value by a formula;
and the summing unit (35) is used for acquiring the first correction quantity and the second correction quantity and adding the first correction quantity and the second correction quantity to obtain the total control quantity.
8. The control optimization system applying polynomial adaptive dynamic feed forward of claim 7, wherein: the processing center (3) further comprises a third calculation unit (34),
the conversion unit (31) is also used for calculating a main steam pressure inertia preset value according to the target load;
a third calculating unit (34) for calculating a deviation correction amount according to the main steam pressure inertia pre-set value and the main steam pressure set value through a formula;
and the summing unit (35) is used for acquiring the first correction quantity, the second correction quantity and the deviation correction quantity and adding the first correction quantity, the second correction quantity and the deviation correction quantity to obtain a total control quantity.
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| CN107218086A (en) * | 2017-07-28 | 2017-09-29 | 华能平凉发电有限责任公司 | Steam turbine and its sliding pressure curve correcting method and system based on load capacity |
| CN111308886A (en) * | 2020-04-07 | 2020-06-19 | 兰州陇能电力科技有限公司 | Coal-fired unit coordination control method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113391615A (en) * | 2021-05-10 | 2021-09-14 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Variable time pulse algorithm for probability statistics |
| CN113391615B (en) * | 2021-05-10 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Variable time pulse algorithm for probability statistics |
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