CN117628486A - Coordination control optimization method and device for coal-fired unit based on bypass heat supply - Google Patents
Coordination control optimization method and device for coal-fired unit based on bypass heat supply Download PDFInfo
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Abstract
The invention provides a coordinated control optimization method and device of a coal-fired unit based on bypass heat supply, and relates to the technical field of automatic control. The method comprises the following steps: when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine; determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters. The apparatus performs the above method. The coordination control optimization method for the coal-fired unit based on bypass heat supply provided by the embodiment of the invention can improve the unit coordination variable load control quality under the bypass heat supply working condition.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a coordination control optimization method and device of a coal-fired unit based on bypass heat supply.
Background
At present, the common thermal decoupling technology comprises bypass heat supply of a high-pressure cylinder and a medium-pressure cylinder of a steam turbine, heat supply of a heat storage tank, heat supply of an electric boiler, zero-output heat supply of a low-pressure cylinder and the like. As shown in figure 1, in the turbine bypass heat supply technology, main and reheat steam is subjected to temperature and pressure reduction and then enters a heat supply network heater through a bypass to supply heat, so that the heat supply capacity of a unit is increased. And after bypass heat supply is put into operation, the lower limit of the output of the steam turbine can be reduced, so that thermal decoupling is realized, and the lower limit of the deep peak regulation load of the unit is reduced.
The temperature and pressure of the turbine are regulated through a turbine bypass in the unit starting stage, the turbine is controlled to perform the flushing and grid connection, and the coal-fired unit is generally provided with a bypass with the capacity of 30% -50% for use in the unit starting process. Therefore, the unit is reformed by adopting a bypass heating technology, and the whole unit only needs less reforming investment.
For coal-fired units, the coordinated control system is the overall integration of the automatic control of the unit. The main objects such as the valve position of the steam turbine, the air quantity of the boiler, the coal supply quantity, the water supply flow and the like are regulated in a coordinated manner, so that the parameters such as the unit load, the main steam pressure, the main steam temperature and the like are regulated. After the coordination control system is put into operation, an operator can realize the automatic change of the load of the unit by directly inputting a load instruction, and simultaneously realize the control and adjustment of main parameters of the unit in the process. The unit is based on coordination control, and can be put into an AGC control mode to realize that the unit receives a load instruction of power grid dispatching and carries out output adjustment according to power grid requirements.
For a conventional coal-fired heat supply unit, all the steam generated by a boiler enters a steam turbine to apply work, and a part of the steam is utilized to exchange heat with a heat supply network heater from a medium-pressure steam extraction pipeline of the steam turbine, so that the unit supplies heat to the urban heat supply network. Under the normal working condition, the steam quantity of the boiler is balanced with the steam inlet quantity of the steam turbine, and the steam inlet quantity of the steam turbine is respectively used for generating an electric load and a heat supply load.
For the unit after bypass heat supply modification, part of heat is subjected to high-side and low-side temperature and pressure reduction under the heat supply working condition, and then the heat exchange is directly carried out on the heat supply network heater. Therefore, under the bypass heat supply working condition, part of steam generated by the boiler enters the bypass, and the other part enters the steam turbine. The steam entering the steam turbine is used for generating electricity and supplying heat by extracting steam respectively.
Thus, by opening the heating bypass, a thermoelectric decoupling between the boiler heat load and the steam-electric load is achieved. Because the classical coordination system control strategy is designed based on the theory of energy balance, under the bypass heating working condition, when the high bypass opening degree and the low bypass opening degree of heating are changed to adjust the heating capacity, the mismatch degree of the boiler and the steam of the steam turbine is also changed at any time, and the effect of the coordination control system is also deteriorated.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a coordinated control optimization method and device for a coal-fired unit based on bypass heat supply, which can at least partially solve the problems in the prior art.
On one hand, the invention provides a coordination control optimization method of a coal-fired unit based on bypass heat supply, which comprises the following steps:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
Wherein, the determining the bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow comprises:
superposing the main steam flow and the high-side front steam flow, and calculating the ratio between the superposed flow and the main steam flow;
and performing amplitude limiting treatment on the ratio, and performing flow rate limiting treatment on the main steam flow and the high-side front steam flow to obtain the bypass heat supply correction coefficient.
The limiting processing is performed on the ratio, and the flow rate limiting processing is performed on the main steam flow and the high-side front steam flow, so as to obtain the bypass heat supply correction coefficient, which comprises the following steps:
limiting the ratio greater than a preset ratio threshold to be the preset ratio threshold;
and limiting the flow rate of the main steam flow and/or the high side front steam flow which is larger than a preset flow rate to the preset flow rate, and taking the limited ratio as the bypass heat supply correction coefficient.
The method for correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises the following steps:
and taking the products of the bypass heat supply correction coefficients and the variable load differential feedforward parameters in the control systems as correction parameters for correcting the variable load differential feedforward parameters in the control systems of the coal-fired unit.
The method for correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises the following steps:
and correcting variable load differential feedforward parameters in the boiler main control system, the water supply main control system, the fuel main control system and the total air quantity control system by using the bypass heat supply correction coefficient.
The coordination control optimization method of the coal-fired unit based on bypass heat supply further comprises the following steps:
and if the bypass heating state is determined not to be cut in, performing flow rate limiting processing on the main steam flow and the high-side front steam flow, and setting the bypass heating correction coefficient to be 1.
On one hand, the invention provides a coordination control optimizing device of a coal-fired unit based on bypass heat supply, which comprises the following components:
the calculation unit is used for calculating the main steam flow according to the regulation stage pressure of the steam turbine when the bypass is cut into a heat supply state;
the determining unit is used for determining a bypass heat supply correction coefficient according to the main steam flow and the high bypass front steam flow;
and the control unit is used for correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
In yet another aspect, an embodiment of the present invention provides a computer device including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following method when executing the computer program:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
An embodiment of the present invention provides a computer-readable storage medium including:
the computer readable storage medium stores a computer program which, when executed by a processor, performs the following method:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
Embodiments of the present invention also provide a computer program product comprising a computer program which, when executed by a processor, performs the following method:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
According to the coordination control optimization method and device for the coal-fired unit based on bypass heat supply, when the coal-fired unit is switched into a bypass heat supply state, main steam flow is calculated according to the regulation stage pressure of the steam turbine; determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters, so that the unit coordination variable load control quality under the bypass heat supply working condition can be improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic illustration of a prior art bypass heating system.
Fig. 2 is a schematic flow chart of a coordinated control optimization method of a coal-fired unit based on bypass heat supply according to an embodiment of the invention.
Fig. 3 is a schematic flow chart of a coordinated control optimization method of a coal-fired unit based on bypass heat supply according to another embodiment of the invention.
Fig. 4 is a schematic structural diagram of a coordinated control optimizing device of a coal-fired unit based on bypass heat supply according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a physical structure of a computer device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.
Fig. 2 is a schematic flow chart of a coordination control optimization method of a coal-fired unit based on bypass heat supply according to an embodiment of the present invention, as shown in fig. 2, the coordination control optimization method of the coal-fired unit based on bypass heat supply according to the embodiment of the present invention includes:
step S1: and when the bypass is cut into a heat supply state, calculating the main steam flow according to the regulating stage pressure of the steam turbine.
Step S2: and determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow.
Step S3: and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
In the step S1, the device calculates the main steam flow according to the turbine regulating stage pressure when switching into the bypass heating state. The apparatus may be a computer device or the like that performs the method. In the technical scheme, the acquisition, storage, use, processing and the like of the data all accord with related regulations. Whether the bypass heating state is switched in or not can be controlled by setting a switch in bypass heating state control button.
When the boiler turbine loads are matched, the main steam flow can represent the heat loads of the unit turbine and the boiler at the same time. In the coordination logic, the main steam flow is generally used as a design basis for setting a unit sliding pressure curve, RB action and reset, and variable parameter control folding lines of each loop.
Because the main steam (i.e., the main steam flow) of the boiler shown in fig. 1 cannot be obtained through actual measurement, the main steam flow can be obtained by utilizing the friedel's formula and calculating according to the regulating stage pressure of the steam turbine under the bypass heating working condition. The specific implementation manner is a conventional technology and will not be described in detail.
In the step S2, the device determines a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow. Since the reheat steam flow of the boiler shown in fig. 1 is small compared with the main steam flow of the boiler, the influence thereof can be ignored, and therefore, the bypass heating correction coefficient of the embodiment of the present invention only considers the influence of the main steam flow and the high bypass front steam flow (the steam flow circulated by high pressure water feed).
The determining the bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow comprises the following steps:
superposing the main steam flow and the high-side front steam flow, and calculating the ratio between the superposed flow and the main steam flow; it will be appreciated that the ratio has a value greater than 1.
And performing amplitude limiting treatment on the ratio, and performing flow rate limiting treatment on the main steam flow and the high-side front steam flow to obtain the bypass heat supply correction coefficient. And performing amplitude limiting processing on the ratio, and performing flow rate limiting processing on the main steam flow and the high-side front steam flow to obtain the bypass heat supply correction coefficient, wherein the method comprises the following steps of:
limiting the ratio greater than a preset ratio threshold to be the preset ratio threshold; the preset ratio threshold can be set independently according to actual conditions, and can be selected to be 2, so that the numerical interval of the ratio after clipping is 1-2.
And limiting the flow rate of the main steam flow and/or the high side front steam flow which is larger than a preset flow rate to the preset flow rate, and taking the limited ratio as the bypass heat supply correction coefficient. The preset flow rate may be set autonomously according to the actual situation, so that the limited flow rate is equal to the preset flow rate.
In the step S3, the device corrects variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient, and controls the coal-fired unit by using each optimized control system after correcting the parameters. The method for correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises the following steps:
and taking the products of the bypass heat supply correction coefficients and the variable load differential feedforward parameters in the control systems as correction parameters for correcting the variable load differential feedforward parameters in the control systems of the coal-fired unit. Namely: correction parameter = original variable load differential feedforward x bypass heating correction coefficient. Each control system corresponds to one of the correction parameters.
The method for correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises the following steps:
and correcting variable load differential feedforward parameters in the boiler main control system, the water supply main control system, the fuel main control system and the total air quantity control system by using the bypass heat supply correction coefficient.
For coal-fired units, the boiler has the characteristics of larger thermal inertia and slower response speed, and the gas turbine valve has the characteristic of quick response. Therefore, when the unit changes load, the quick response of the unit to the load is realized by changing the opening degree of the valve of the steam turbine. Meanwhile, the coal amount and water amount of the boiler need to be excessively increased or reduced, so that the problem of larger thermal inertia of the boiler during load changing is solved. The control logic is embodied as variable load differential feedforward in the boiler main control, variable load differential feedforward in the water supply main control, variable load differential feedforward in the fuel main control, variable load differential feedforward in the total air volume control and the like.
Under the bypass heating working condition, the differential feedforward effect of each control subsystem is also required to be corrected under the variable load working condition because of the mismatch of the thermoelectric loads of the boiler and the steam turbine. By utilizing the bypass heat supply correction coefficient provided by the invention, the bypass heat supply correction coefficient is multiplied in the original differential feedforward logic in each control loop, so that a better control effect under a variable load working condition can be realized.
The coordination control optimization method of the coal-fired unit based on bypass heat supply further comprises the following steps:
and if the bypass heating state is determined not to be cut in, performing flow rate limiting processing on the main steam flow and the high-side front steam flow, and setting the bypass heating correction coefficient to be 1. The following is described in connection with fig. 3: t2 may be understood as a judgment rule, specifically including:
1. when the bypass heating state is not cut in, the judgment condition is N, the bypass heating correction coefficient is set to be 1, and flow rate limiting processing is carried out on the main steam flow and the high-side front steam flow.
2. When the bypass heating state is cut in, the judgment condition is Y, the limited ratio is used as a bypass heating correction coefficient, and the flow rate limiting treatment is carried out on the main steam flow and the high-bypass front steam flow.
The invention aims at optimizing a coordination control system for the coal-fired power unit after bypass heat supply transformation, improving the control quality of the coordination control system, realizing stable investment of unit AGC and coordination control under the bypass heat supply working condition, and guaranteeing the requirement of a power grid on flexible adjustment of wide load of the coal-fired power unit.
After a certain 350MW unit bypass heat supply is modified, the bypass heat supply coordination control optimization scheme is configured and applied in a DCS system, after logic is optimized by adding a coordination correction coefficient, a unit load change test is carried out, the load fluctuation amount is 35MW (10%Pe), and in the load change process, operators adjust the bypass opening simultaneously to change the heat supply flow, and the control effect is as follows. The maximum control deviation of the main steam pressure is 0.4MPa in the process that the main steam pressure follows the sliding pressure set value. In the process, main parameters comprise load and main steam pressure, and good control effect is realized.
The coordination control optimization method of the coal-fired unit based on bypass heat supply provided by the embodiment of the invention has the following advantages:
1. the scheme provides a concept of a bypass heat supply correction coefficient, solves the problem of unmatched heat load of the boiler steam turbine under the bypass heat supply working condition, and improves the coordinated variable load control quality of the unit under the bypass heat supply working condition.
2. The implementation method of the scheme is simple and convenient, is convenient for configuration implementation in the DCS, and has low cost and small risk. Through less logic modification, the coordinated control logic optimization after the bypass heat supply modification of the coal-fired unit is realized.
According to the coordination control optimization method for the coal-fired unit based on bypass heat supply, when the coal-fired unit is switched into a bypass heat supply state, main steam flow is calculated according to the regulation level pressure of the steam turbine; determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters, so that the unit coordination variable load control quality under the bypass heat supply working condition can be improved.
Further, the determining the bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow includes:
superposing the main steam flow and the high-side front steam flow, and calculating the ratio between the superposed flow and the main steam flow; the description of the embodiments may be referred to above, and will not be repeated.
And performing amplitude limiting treatment on the ratio, and performing flow rate limiting treatment on the main steam flow and the high-side front steam flow to obtain the bypass heat supply correction coefficient. The description of the embodiments may be referred to above, and will not be repeated.
Further, the limiting processing is performed on the ratio, and the flow rate limiting processing is performed on the main steam flow and the high-side front steam flow, so as to obtain the bypass heat supply correction coefficient, which includes:
limiting the ratio greater than a preset ratio threshold to be the preset ratio threshold; the description of the embodiments may be referred to above, and will not be repeated.
And limiting the flow rate of the main steam flow and/or the high side front steam flow which is larger than a preset flow rate to the preset flow rate, and taking the limited ratio as the bypass heat supply correction coefficient. The description of the embodiments may be referred to above, and will not be repeated.
Further, the correcting the variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises the following steps:
and taking the products of the bypass heat supply correction coefficients and the variable load differential feedforward parameters in the control systems as correction parameters for correcting the variable load differential feedforward parameters in the control systems of the coal-fired unit. The description of the embodiments may be referred to above, and will not be repeated.
Further, the correcting the variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises the following steps:
and correcting variable load differential feedforward parameters in the boiler main control system, the water supply main control system, the fuel main control system and the total air quantity control system by using the bypass heat supply correction coefficient. The description of the embodiments may be referred to above, and will not be repeated.
Further, the coordination control optimization method of the coal-fired unit based on bypass heat supply further comprises the following steps:
and if the bypass heating state is determined not to be cut in, performing flow rate limiting processing on the main steam flow and the high-side front steam flow, and setting the bypass heating correction coefficient to be 1. The description of the embodiments may be referred to above, and will not be repeated.
Fig. 4 is a schematic structural diagram of a coordination control optimizing device for a coal-fired unit based on bypass heat supply according to an embodiment of the present invention, and as shown in fig. 4, the coordination control optimizing device for a coal-fired unit based on bypass heat supply according to an embodiment of the present invention includes a calculating unit 401, a determining unit 402, and a control unit 403, where:
the calculating unit 401 is used for calculating the main steam flow according to the regulating stage pressure of the steam turbine when switching into the bypass heating state; the determining unit 402 is configured to determine a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; the control unit 403 is configured to correct variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient, and control the coal-fired unit by using each optimized control system after the correction parameters.
Specifically, the calculating unit 401 in the device is used for calculating the main steam flow according to the turbine regulating stage pressure when switching into the bypass heating state; the determining unit 402 is configured to determine a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; the control unit 403 is configured to correct variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient, and control the coal-fired unit by using each optimized control system after the correction parameters.
Further, the determining unit 402 is specifically configured to:
superposing the main steam flow and the high-side front steam flow, and calculating the ratio between the superposed flow and the main steam flow;
and performing amplitude limiting treatment on the ratio, and performing flow rate limiting treatment on the main steam flow and the high-side front steam flow to obtain the bypass heat supply correction coefficient.
Further, the determining unit 402 is specifically further configured to:
limiting the ratio greater than a preset ratio threshold to be the preset ratio threshold;
and limiting the flow rate of the main steam flow and/or the high side front steam flow which is larger than a preset flow rate to the preset flow rate, and taking the limited ratio as the bypass heat supply correction coefficient.
Further, the control unit 403 is specifically configured to:
and taking the products of the bypass heat supply correction coefficients and the variable load differential feedforward parameters in the control systems as correction parameters for correcting the variable load differential feedforward parameters in the control systems of the coal-fired unit.
Further, the control unit 403 is specifically configured to:
and correcting variable load differential feedforward parameters in the boiler main control system, the water supply main control system, the fuel main control system and the total air quantity control system by using the bypass heat supply correction coefficient.
Further, the coordination control optimizing device of the coal-fired unit based on bypass heat supply is also used for:
and if the bypass heating state is determined not to be cut in, performing flow rate limiting processing on the main steam flow and the high-side front steam flow, and setting the bypass heating correction coefficient to be 1.
The coordination control optimizing device of the coal-fired unit based on bypass heat supply provided by the embodiment of the invention calculates the main steam flow according to the regulation level pressure of the steam turbine when the coal-fired unit is switched into a bypass heat supply state; determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters, so that the unit coordination variable load control quality under the bypass heat supply working condition can be improved.
The embodiment of the coordinated control optimizing device of the coal-fired unit based on bypass heat supply provided by the embodiment of the invention can be particularly used for executing the processing flow of each method embodiment, and the functions of the coordinated control optimizing device are not repeated herein, and can be described in detail with reference to the method embodiments.
Fig. 5 is a schematic diagram of an entity structure of a computer device according to an embodiment of the present invention, as shown in fig. 5, where the computer device includes: memory 501, processor 502 and a computer program stored on memory 501 and executable on processor 502, which processor 502 when executing the computer program implements the method of:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
The present embodiment discloses a computer program product comprising a computer program which, when executed by a processor, implements the method of:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
The present embodiment provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method of:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
Compared with the technical scheme in the prior art, the coordination control optimization method for the coal-fired unit based on bypass heat supply provided by the embodiment of the invention calculates the main steam flow according to the regulation stage pressure of the steam turbine when the coal-fired unit is thrown into a bypass heat supply state; determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow; and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters, so that the unit coordination variable load control quality under the bypass heat supply working condition can be improved.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. 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.
In the description of the present specification, reference to the terms "one embodiment," "one particular embodiment," "some embodiments," "for example," "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A coordination control optimization method of a coal-fired unit based on bypass heat supply is characterized by comprising the following steps:
when the bypass is cut into a heat supply state, calculating main steam flow according to the regulating stage pressure of the steam turbine;
determining a bypass heating correction coefficient according to the main steam flow and the high bypass front steam flow;
and correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
2. The coordinated control optimization method of a coal-fired unit based on bypass heating according to claim 1, wherein the determining a bypass heating correction coefficient according to the main steam flow and the high bypass pre-steam flow comprises:
superposing the main steam flow and the high-side front steam flow, and calculating the ratio between the superposed flow and the main steam flow;
and performing amplitude limiting treatment on the ratio, and performing flow rate limiting treatment on the main steam flow and the high-side front steam flow to obtain the bypass heat supply correction coefficient.
3. The coordinated control optimization method based on bypass heat supply according to claim 2, wherein the performing limiting processing on the ratio and performing flow rate limiting processing on the main steam flow and the high-side pre-steam flow to obtain the bypass heat supply correction coefficient comprises:
limiting the ratio greater than a preset ratio threshold to be the preset ratio threshold;
and limiting the flow rate of the main steam flow and/or the high side front steam flow which is larger than a preset flow rate to the preset flow rate, and taking the limited ratio as the bypass heat supply correction coefficient.
4. The coordinated control optimization method of a coal-fired unit based on bypass heating according to claim 1, wherein the correcting the variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises:
and taking the products of the bypass heat supply correction coefficients and the variable load differential feedforward parameters in the control systems as correction parameters for correcting the variable load differential feedforward parameters in the control systems of the coal-fired unit.
5. The coordinated control optimization method of a coal-fired unit based on bypass heating according to claim 1, wherein the correcting the variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heating correction coefficient comprises:
and correcting variable load differential feedforward parameters in the boiler main control system, the water supply main control system, the fuel main control system and the total air quantity control system by using the bypass heat supply correction coefficient.
6. The coordinated control optimization method of a bypass heating-based coal-fired unit according to any one of claims 1 to 5, characterized in that the coordinated control optimization method of a bypass heating-based coal-fired unit further comprises:
and if the bypass heating state is determined not to be cut in, performing flow rate limiting processing on the main steam flow and the high-side front steam flow, and setting the bypass heating correction coefficient to be 1.
7. The utility model provides a coal-fired unit's coordinated control optimizing apparatus based on bypass heat supply which characterized in that includes:
the calculation unit is used for calculating the main steam flow according to the regulation stage pressure of the steam turbine when the bypass is cut into a heat supply state;
the determining unit is used for determining a bypass heat supply correction coefficient according to the main steam flow and the high bypass front steam flow;
and the control unit is used for correcting variable load differential feedforward parameters in each control system of the coal-fired unit by using the bypass heat supply correction coefficient, and controlling the coal-fired unit by using each optimized control system after correcting the parameters.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 6 when executing the computer program.
9. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method of any of claims 1 to 6.
10. A computer program product, characterized in that the computer program product comprises a computer program which, when executed by a processor, implements the method of any of claims 1 to 6.
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| CN202311460784.1A CN117628486A (en) | 2023-11-06 | 2023-11-06 | Coordination control optimization method and device for coal-fired unit based on bypass heat supply |
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