CN114562718A - Optimal control method and device for cogeneration unit and storage medium - Google Patents
Optimal control method and device for cogeneration unit and storage medium Download PDFInfo
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Abstract
The invention discloses an optimal control method, an optimal control device and a storage medium for a cogeneration unit, wherein the method comprises the following steps: determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units; adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized, and obtaining a plurality of distribution modes; calculating according to the output power of a generator terminal of the unit to be optimized to obtain the corresponding industrial steam supply critical economic flow; determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the industrial steam supply critical economic flow; and comparing the heat economy according to each distribution formula to obtain the industrial steam supply flow of each unit. By implementing the method, the heat load of industrial steam supply among the units of the power plant can be reasonably planned, so that the operating economy of the power plant is optimal, and the economy, refinement and automation level of the overall operation of the power plant are provided.
Description
Technical Field
The invention relates to the technical field of power station boilers and steam turbine systems, in particular to an optimal control method and device for a cogeneration unit and a storage medium.
Background
With the continuous adjustment and optimization of the structure of the electric power industry in China, the expansion of the operating income of a thermal power plant by only depending on power generation is limited to a certain extent, and many power plants begin to develop industrial steam supply to realize cogeneration. The energy utilization rate of a thermal power plant is only about 40 percent, while the thermal power plant is an advanced energy utilization form which can generate electricity and heat, not only saves energy, but also can replace a small boiler for scattered heat supply to improve the environmental quality, and the thermal efficiency is generally over 45 percent.
Cold-stage reheat steam extraction and hot-stage reheat steam extraction (hereinafter referred to as cold-stage reheat and hot-stage reheat) are common and important industrial steam supply modes, and the economy of unit operation is closely related to the rationality of steam extraction parameters. In order to formulate an economic and reasonable industrial steam supply transformation scheme, related scholars respectively study different schemes for supplying industrial steam, such as a heat pump, a back pressure turbine exhaust, a temperature and pressure reducer, a pressure matcher and the like, and the scheme has certain reference significance for heat supply transformation of units of the same type. For further improving operation of cogeneration unitsEconomic efficiency, students respectively reduce the secondary heat exchanger
The method is characterized in that the aspects of waste steam waste heat utilization improvement, steam extraction throttling loss reduction and the like are researched, the improvement schemes of a series-parallel connection coupling absorption heat pump, novel multi-heat source step heat supply for optimizing back pressure, back pressure increasing machine and the like are provided, and the comprehensive energy efficiency and the economical efficiency of the optimized system are improved.
In order to optimize the micro-grid coordinated dispatching of the combined heat and power system and reduce the operation cost of the micro-grid, related scholars respectively conduct research on the aspects of performance evaluation of the micro-grid, economic dispatching of the comprehensive energy system and the like through Monte Carlo experiment comparison, improved chaotic particle swarm optimization algorithm, hierarchical optimization dispatching, weak robust optimization and the like. However, in actual production, some industrial steam extraction points are unreasonably selected, so that the energy consumption of the unit is increased due to industrial steam supply, the thermal economy of the unit operation is deteriorated, the statistical coal consumption is seriously inconsistent with the calculated coal consumption, the coal loss is caused in the power plant production, and the operation difficulty is caused. Under certain working conditions, industrial steam supply cascade utilization can properly increase the steam exhaust pressure of a high-pressure cylinder to meet the steam demand of industrial users, but energy loss can be increased, if the energy loss cannot be balanced by the positive effect of energy consumption reduction caused by the cascade utilization of the industrial steam extraction, the cascade utilization is likely to cause the energy consumption of the units to be increased, and for a power plant with multiple units for industrial steam supply simultaneously, the unreasonable distribution of industrial steam supply load among the units can cause the energy consumption of the units to be increased.
Disclosure of Invention
In view of this, embodiments of the present invention provide an optimal control method, an optimal control device, and a storage medium for a cogeneration unit, so as to solve the technical problem in the prior art that the distribution of industrial steam supply among units is not reasonable.
The technical scheme provided by the invention is as follows:
the first aspect of the embodiments of the present invention provides an optimal control method for a cogeneration unit, including: determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units; adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized, and obtaining multiple distribution modes; calculating to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode; determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow; and comparing the heat economy according to the industrial steam supply flow of the adjusting unit in each distribution mode and the corresponding industrial steam supply flow optimized by the unit to be optimized to obtain the industrial steam supply flow of each unit.
Optionally, determining the optimized industrial steam supply flow of the unit to be optimized according to the relationship between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow, including: when the industrial steam supply flow of the unit to be optimized is larger than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is larger than or equal to the corresponding industrial steam supply critical economic flow; when the flow rate is larger than or equal to the preset flow rate, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of the other unit to be optimized, and judging whether the thermal economy after flow optimization is larger than that before optimization or not; and when the current value is not more than the preset value, continuously optimizing the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow and judging the thermal economy until the optimized thermal economy is more than the thermal economy before optimization, and obtaining the optimized industrial steam supply flow of the unit to be optimized.
Optionally, determining the optimized industrial steam supply flow rate of the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, and further comprising: when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relationship between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow; and adjusting the industrial steam supply flow of the unit to be optimized with a large difference value to be 0, and adding the industrial steam supply flow of the unit to be optimized with a small difference value and the industrial steam supply flow of the unit to be optimized with a large difference value to obtain the optimized industrial steam supply flow of the unit to be optimized.
Optionally, determining the optimized industrial steam supply flow rate of the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, and further comprising: when the industrial steam supply flow rates of the two units to be optimized are respectively greater than or equal to and smaller than the corresponding industrial steam supply critical economic flow rate, judging the relationship between the industrial steam supply flow rate of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow rate; judging whether the unit to be optimized corresponding to the industrial steam supply critical economic flow with the smaller difference value is smaller than the corresponding unit to be optimized; when the steam supply flow rate of the two units to be optimized is smaller than the corresponding critical economic flow rate of the industrial steam supply, adjusting the industrial steam supply flow rate of the two units to be optimized according to a smaller difference value; optimizing the adjusted industrial steam supply flow of the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after the flow optimization is greater than the economical efficiency before the optimization; and when the steam supply flow is not larger than the preset value, continuously optimizing the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow and judging the economy until the economy after optimization is larger than that before optimization, and obtaining the optimized industrial steam supply flow of the unit to be optimized.
Optionally, determining the optimized industrial steam supply flow rate of the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, and further comprising: and when the smaller difference value corresponds to the unit to be optimized with the industrial steam supply critical economic flow more than or equal to the corresponding industrial steam supply critical economic flow, adjusting the industrial steam supply flow of the unit to be optimized with the larger difference value to be 0, adding the industrial steam supply flow of the unit to be optimized with the smaller difference value and the industrial steam supply flow of the unit to be optimized with the larger difference value to obtain the optimized industrial steam supply flow of the unit to be optimized.
Optionally, the method for obtaining the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized by calculating according to the output power of the generator terminal of the unit to be optimized in each distribution mode includes: determining the heat consumption of a pure condensing working condition unit and the heat consumption of an industrial steam supply working condition unit according to the output power of a generator terminal of the unit to be optimized; and calculating according to the heat consumption of the pure condensing working condition unit and the heat consumption of the industrial steam supply working condition unit to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized.
Optionally, the industrial steam supply flow of the adjusting unit is adjusted according to the total steam supply flow, the industrial steam supply flow of the unit to be optimized is determined, and multiple distribution modes are obtained, including: sequentially adjusting the industrial steam supply flow of each unit in the adjusting units according to the total steam supply flow; and determining the industrial steam supply flow of a group of units to be optimized according to the difference value between the industrial steam supply flow and the total steam supply flow of the adjusted units after each adjustment.
A second aspect of an embodiment of the present invention provides an optimal control device for a cogeneration unit, including: the optimization unit determining module is used for determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units; the flow determining module is used for adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized and obtaining a plurality of distribution modes; the critical flow determining module is used for calculating and obtaining the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode; the optimization module is used for determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow; and the comparison module is used for carrying out thermal economy comparison according to the industrial steam supply flow of the adjusting unit in each distribution mode and the corresponding industrial steam supply flow optimized by the unit to be optimized to obtain the industrial steam supply flow of each unit.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the method for optimally controlling a cogeneration unit according to any one of the first aspect and the first aspect of the embodiments of the present invention.
A fourth aspect of embodiments of the present invention provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method for optimally controlling a cogeneration unit according to any one of the first aspect and the first aspect of the embodiments of the present invention.
The technical scheme provided by the invention has the following effects:
the optimization control method, the optimization control device and the storage medium of the cogeneration units provided by the embodiment of the invention are characterized in that the units to be optimized and the adjusting units are determined based on the number of the cogeneration units, the industrial steam supply flow of the units to be optimized is determined according to the industrial steam supply flow of the adjusting units, the industrial steam supply flow of the units to be optimized is optimized by adopting a method of comparing the industrial steam supply flow with the industrial steam supply critical economic flow, various distribution modes are obtained, then the heat economy of the various distribution modes is judged, and the optimal distribution mode is finally obtained. Therefore, by the optimization control method, the heat load of industrial steam supply among all units of the power plant can be reasonably planned, the running economy of the power plant is optimized, and the whole running economy, refinement and automation level of the power plant are improved.
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 flowchart of an optimal control method of a cogeneration unit according to an embodiment of the invention;
fig. 2 is a flowchart of an optimization control method of a cogeneration unit according to another embodiment of the invention;
FIG. 3 is a schematic diagram of an energy consumption critical characteristic curve of the unit under different working conditions under an industrial extraction pressure of 3.0MPa according to an embodiment of the invention;
fig. 4 is a block diagram of the configuration of the optimization control device of the cogeneration unit according to the embodiment of the invention;
FIG. 5 is a schematic structural diagram of a computer-readable storage medium provided according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be implemented in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the invention, there is provided a method of optimizing control of a cogeneration unit, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
In this embodiment, an optimal control method for a cogeneration unit is provided, which may be used for electronic devices, such as a computer, a mobile phone, a tablet computer, and the like, fig. 1 is a flowchart of the optimal control method for the cogeneration unit according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
an embodiment of the present invention provides an optimal control method for a cogeneration unit, as shown in fig. 1, the method includes the following steps:
step S101: and determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units. Specifically, the optimization control method is suitable for a power plant which adopts two or more units for industrial steam supply. When two units supply steam industrially, the two units are both used as the units to be optimized. When more than two units supply steam industrially, two units are selected from the units randomly as the units to be optimized, and the rest units are used as the adjusting units.
Step S102: and adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized, and obtaining various distribution modes. Specifically, when the power plant needs to supply industrial steam, the total steam supply flow rate of the power plant which needs steam supply is constant, so that the industrial steam supply flow rate of the set can be determined and adjusted firstly based on the total steam supply flow rate, and the industrial steam supply flow rates of the two sets to be optimized are obtained. The industrial steam supply flow of each unit in the adjusting units is sequentially adjusted according to the total steam supply flow; and determining the industrial steam supply flow of a group of units to be optimized according to the difference value between the industrial steam supply flow and the total steam supply flow of the adjusted units each time.
For example, as shown in fig. 2, when the cogeneration unit includes three units, two units are selected as the units to be optimized, and the remaining unit is used as the adjusting unit. And then, starting to adjust the industrial steam supply flow of the adjusting unit from 0, when the industrial steam supply flow of the adjusting unit is 0, taking the steam supply flow of the two units to be optimized as the total steam supply flow, and then, averagely distributing the total steam supply flow to each unit to be optimized to obtain the industrial steam supply flow of the units to be optimized. Thereby determining a manner of allocation.
And then adjusting the steam supply flow of the adjusting unit, and in order to make the final result more accurate, adjusting by taking the unit steam supply flow as a reference, namely increasing the unit steam supply flow of the adjusting unit every time, and then taking the average value of the difference value between the total steam supply flow and the steam supply flow of the adjusting unit as the steam supply flow of the unit to be optimized.
And continuously adjusting the steam supply flow of the adjusting unit, calculating to obtain the steam supply flow of the unit to be optimized by adopting the mode, and determining the industrial steam supply flow of the unit to be optimized to be 0 until the steam supply flow of the adjusting unit is the total steam supply flow. Therefore, by adjusting the industrial steam supply flow of the adjusting unit, various distribution modes of the industrial steam supply flow can be obtained.
When the cogeneration unit comprises four units, two units are selected as the units to be optimized, and the rest two units are used as the adjusting units. When the flow rates of the two adjusting units are adjusted, the flow rate of one adjusting unit is fixed, for example, the flow rate of the other adjusting unit and the flow rate of the unit to be optimized are fixed to 0, and then the flow rates of the other adjusting unit and the flow rate of the unit to be optimized are adjusted according to the above mode. And then increasing the flow of the fixed adjusting unit by the unit steam supply flow, and adjusting according to the above mode. Therefore, the flow of the fixed adjusting unit is sequentially adjusted until the flow is fixed to be the total steam supply flow.
When the cogeneration unit includes more than four units, the flow of the remaining adjustment units can be fixed by continuously adjusting the flow of one adjustment unit according to the method, so that all the adjustment units can traverse all the flow combinations. Thus, in the manner described above, a variety of dispensing patterns are available.
Step S103: and calculating to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode. When the flow optimization is carried out on the unit to be optimized, the industrial steam supply critical economic flow of the two units to be optimized is calculated. The industrial steam supply critical economic flow is the flow when the heat consumption of the industrial steam supply working condition is equal to the heat consumption of the pure condensation working condition, and therefore, the flow calculation step comprises the following steps: determining the heat consumption of a pure condensing working condition unit and the heat consumption of an industrial steam supply working condition unit according to the output power of a generator terminal of the unit to be optimized; and calculating according to the heat consumption of the pure condensing working condition unit and the heat consumption of the industrial steam supply working condition unit to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized.
Specifically, the heat consumption of the unit under the pure condensation condition is calculated by the following formula:
wherein r iscnThe unit represents the heat consumption of the unit under the pure condensation working condition, and the unit is kJ/(kW & h); y represents the output power of the generator terminal of the unit, and the unit is kW; qcnAnd expressing the boiler heat absorption capacity of the pure condensing working condition medium, kJ/h.
The heat consumption of the industrial steam supply working condition unit is calculated by the following formula:
wherein r isgyThe unit represents the heat consumption of the industrial steam supply working condition of the unit, and the unit is kJ/(kW.h), QgyThe boiler heat absorption capacity of industrial steam supply working condition media is expressed in kJ/h; h1 represents the enthalpy of industrial extraction steam in kJ/kg; h2 represents the enthalpy value of industrial backwater, unit kJ/kg; x represents the industrial steam extraction flow rate of the industrial steam extraction working condition of the unit, and the unit is kg/h.
The industrial steam supply critical economic flow is the flow when the heat consumption of the industrial steam supply working condition is equal to the heat consumption of the pure condensation working condition. When the industrial steam supply critical economic flow is calculated, the two formulas are combined, and the calculation formula of the industrial steam supply critical economic flow can be obtained as follows:
step S104: and determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow.
Specifically, the critical economic flow Xc of the industrial steam supply of the unit is a key parameter related to the heat economy of the cogeneration unit, and under the same output power of the generator terminal of the unit, when the industrial steam supply flow X of the industrial steam supply working condition unit is greater than the critical industrial steam supply economic flow Xc under the electric load, the industrial steam supply is beneficial to reducing the energy consumption level of the unit, and the heat economy of the unit is improved; when the industrial steam supply flow X of the industrial steam supply working condition unit is equal to the critical industrial steam supply economic flow Xc under the electric load, the heat consumption of the industrial steam supply working condition unit is equal to that of the straight condensing working condition unit, and the industrial steam supply does not contribute to improving the heat economy of the unit; when the industrial steam supply flow X is smaller than the critical industrial steam supply economic flow Xc under the electric load, the heat consumption of the industrial steam supply working condition unit is larger than that of the pure condensing working condition unit, the industrial steam supply does not contribute to improving the heat economy of the unit, the industrial steam supply can cause the whole coal consumption level of the unit to be increased instead, and the heat economy of the unit is deteriorated.
Therefore, the industrial steam supply flow of the unit to be optimized can be optimized by comparing the industrial steam supply flow of the unit to be optimized with the corresponding industrial steam supply critical economic flow, and the optimized industrial steam supply flow is obtained.
Step S105: and comparing the heat economy according to the industrial steam supply flow of the adjusted unit in each distribution mode and the optimized industrial steam supply flow of the corresponding unit to be optimized to obtain the industrial steam supply flow of each unit. According to the step S102, when determining the industrial steam supply flow of the unit to be optimized, the steam supply flow of the corresponding adjusting unit is adjusted, so that a plurality of distribution modes can be obtained. The optimized industrial steam supply flow rate of each group of the units to be optimized can be obtained through optimization, then the optimized industrial steam supply flow rate of each group of the units to be optimized and the economy of the industrial steam supply flow rate distribution of the adjusting units are calculated, and the distribution result with the optimal economy is obtained. And then determining the industrial steam supply flow of each unit according to the distribution result.
Specifically, when the economy is judged, the heat consumption of the unit is calculated according to the flow of the unit under each distribution condition and the corresponding output power of the generator terminal, and then the heat economy is calculated according to the heat consumption and the output power of the generator terminal. For example, the cogeneration unit includes three units. The finally determined flow rates of the three units are respectively X1, X2 and X3, the output powers of the generator terminals of the three units are respectively Y1, Y2 and Y3, the heat consumption of each unit is respectively R1, R2 and R3, and the heat economy of the three units obtained through calculation is represented as R1 multiplied by Y1+ R2 multiplied by Y2+ R3 multiplied by Y3. And after a plurality of distribution modes are obtained through calculation, each distribution mode is compared by adopting the corresponding thermal economy obtained through calculation of the mode, and the distribution mode with the maximum thermal economy is selected as the optimal distribution result.
The optimal control method of the cogeneration unit provided by the embodiment of the invention determines the unit to be optimized and the adjusting unit based on the number of the cogeneration units, determines the industrial steam supply flow of the unit to be optimized according to the industrial steam supply flow of the adjusting unit, optimizes the industrial steam supply flow of the unit to be optimized by adopting a method of comparing the industrial steam supply flow with the industrial steam supply critical economic flow to obtain a plurality of distribution modes, judges the heat economy of the plurality of distribution modes and finally obtains the optimal distribution mode. Therefore, by the optimization control method, the heat load of industrial steam supply among the units of the power plant can be reasonably planned, the running economy of the power plant is optimized, and the whole running economy, refinement and automation level of the power plant is improved.
In one embodiment, the method for determining the optimized industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate comprises the following steps:
step S201: and when the industrial steam supply flow of the unit to be optimized is more than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is more than or equal to the corresponding industrial steam supply critical economic flow. The industrial steam supply flow rates of the two units to be optimized are respectively represented as X1 and X2, 1 represents the unit number 1, 2 represents the unit number 2, the industrial steam supply critical economic flow rates of the two units to be optimized are respectively represented as Xc1 and Xc2, the unit steam supply flow rate is represented by 1, the unit steam supply flow rate is the minimum steam supply distribution unit, and the unit steam supply flow rate can be determined based on actual conditions, for example, 1 ton or 0.1 ton can be realized. When X1 is more than or equal to Xc1 and X2 is more than or equal to Xc2, firstly, judging whether X1-1 is more than or equal to Xc1, if X1-1 is more than or equal to Xc1, carrying out the calculation of increase and decrease of the next step, if X1-1 is less than Xc1, judging that X2-1 is more than or equal to Xc2, if so, carrying out the calculation of increase and decrease of the next step, and if X2-1 is less than Xc2, keeping the current state without optimization.
Step S202: and when the flow rate is larger than or equal to the preset flow rate, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of the other unit to be optimized, and judging whether the thermal economy after flow optimization is larger than that before optimization or not. When X1-1 is larger than or equal to Xc1, the industrial steam supply flow of the two units to be optimized after flow optimization is represented as X1 ═ X1-1 and X2 ═ X2+1, the heat economy before and after optimization is calculated according to formulas R1 xY 1+ R2 xY 2 and R1 'xY 1+ R2' xY 2, R1 and R2 respectively represent the heat consumption of the two units to be optimized before and after optimization, Y1 and Y2 respectively represent the output power of the generator terminals of the two units to be optimized before and after optimization, and the heat consumption of the two units to be optimized after optimization is represented as R1 'and R2'. In addition, when the flow rate is more than or equal to X2-1 and more than or equal to Xc2, corresponding calculation is also carried out, the industrial steam supply flow rates of the two units to be optimized after the flow rate optimization are represented as X1 ═ X1+1 and X2 ═ X2-1, and then the heat economy calculation is carried out in the same way, which is not described in detail herein.
Step S203: and when the flow rate is not greater than the preset flow rate, continuously optimizing the industrial steam supply flow rate of the unit to be optimized according to the unit steam supply flow rate and judging the thermal economy until the optimized thermal economy is greater than the thermal economy before optimization, and obtaining the optimized industrial steam supply flow rate of the unit to be optimized. When R1 'xY 1+ R2' xY 2 is not larger than R1 xY 1+ R2 xY 2, continuously calculating X1 '-1 and X2' -1, judging the heat economy before and after optimization according to the formula, and if the heat economy after optimization is larger than the heat economy before optimization, taking the optimized flow as the optimized flow of the unit to be optimized at the moment.
Step S204: and when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relationship between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow. Specifically, if it is determined that X1 < Xc1 and X2 < Xc2 are determined, Δ X1 ═ Xc 1-X1, Δ X2 ═ Xc 2-X2 are calculated, and Δ X1 and Δ X2 are determined in size.
Step S205: and adjusting the industrial steam supply flow of the unit to be optimized with a large difference value to be 0, and adding the industrial steam supply flow of the unit to be optimized with a small difference value and the industrial steam supply flow of the unit to be optimized with a large difference value to obtain the optimized industrial steam supply flow of the unit to be optimized. Specifically, when Δ X1 is greater than or equal to Δ X2, the optimized industrial steam supply flow rates of the two units to be optimized are respectively represented as 0 (unit No. 1) and X2+ X1 (unit No. 2); when the delta X1 is less than the delta X2, the optimized industrial steam supply flow of the two units to be optimized is respectively expressed as X1+ X2 (unit No. 1) and 0 (unit No. 2).
Step S206: when the industrial steam supply flow rates of the two units to be optimized are respectively greater than or equal to and smaller than the corresponding industrial steam supply critical economic flow rate, judging the relationship between the industrial steam supply flow rate of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow rate; specifically, if it is judged that X1 is not less than Xc1 and X2 < Xc2, Δ X1 ═ X1-Xc 1 and Δ X2 ═ Xc 2-X2 are calculated; if the judgment determines that X1 is less than Xc1 and X2 is more than or equal to Xc2, calculating delta X1-Xc 1-X1 and delta X2-X2-Xc 2; the magnitude of Δ X1 and Δ X2 was then determined in each case.
Step S207: and judging whether the unit to be optimized corresponding to the smaller difference value is smaller than the corresponding industrial steam supply critical economic flow. Specifically, if X1 is more than or equal to Xc1 and X2 is less than Xc2, and meanwhile, delta X1 is more than or equal to delta X2; alternatively, X1 < Xc1, X2. gtoreq.Xc 2, and Δ X2. gtoreq.DELTA.X 1, both are judged to correspond to each other.
Step S208: and when the steam supply flow rate of the two units to be optimized is smaller than the corresponding critical economic flow rate of the industrial steam supply, adjusting the industrial steam supply flow rate of the two units to be optimized according to a smaller difference value. Specifically, if the above condition is satisfied, the flow rate adjustment is performed in accordance with the small difference Δ X1 or Δ X2. For example, if the above conditions are satisfied and the difference is small, the flow rate after adjustment is X1 ═ X1+ Δ X1, and X2 ═ X2 to Δ X1, respectively; if the above conditions are satisfied and the difference is small, the flow rate after adjustment is X1 ═ X1- Δ X2, and X2 ═ X2+ Δ X2, respectively.
Step S209: and optimizing the industrial steam supply flow adjusted by the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after the flow optimization is greater than that before the optimization. Specifically, when the difference is small, it is judged that X2 ″ ═ X2 ″ -1 ≧ Xc2, and if so, flow optimization is performed by the formulas X1 ″ = X1' +1 and X2 ″ = X2 ″ -1, and economy before and after optimization is judged by the formulas (R1 × Y1+ R2 × Y2)/(Y1+ Y2). When the difference is smaller in the number 2 unit, it is judged that X1 ″ ═ X1 ≧ Xc1, and if so, flow optimization is performed by the formulas X1 ″ ═ X1 ″ -1 and X2 ″ ═ X2 ″ +1, and judgment of economy before and after optimization is performed by the formula (R1 × Y1+ R2 × Y2)/(Y1+ Y2).
Step S210: and when the steam supply flow is not larger than the preset value, continuously optimizing the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow and judging the economy until the economy after optimization is larger than that before optimization, and obtaining the optimized industrial steam supply flow of the unit to be optimized. When (R1 '× Y1+ R2' × Y2)/(Y1+ Y2) is not more than (R1 × Y1+ R2 × Y2)/(Y1+ Y2), continuing the optimization, and judging the economies before and after the optimization according to the above formula, if the post-optimization economy is greater than the pre-optimization economy, taking the optimized flow rate as the flow rate after the optimization of the unit to be optimized at that time.
Step S211: and when the smaller difference value corresponds to the unit to be optimized with the industrial steam supply critical economic flow more than or equal to the corresponding industrial steam supply critical economic flow, adjusting the industrial steam supply flow of the unit to be optimized with the larger difference value to be 0, adding the industrial steam supply flow of the unit to be optimized with the smaller difference value and the industrial steam supply flow of the unit to be optimized with the larger difference value to obtain the optimized industrial steam supply flow of the unit to be optimized. Specifically, if X1 is more than or equal to Xc1, X2 is less than Xc2, and meanwhile, delta X2 is more than or equal to delta X1, the optimized industrial steam supply flow rates of the two units to be optimized are respectively represented as X1+ X2 (unit No. 1) and 0 (unit No. 2); if X1 is less than Xc1, X2 is more than or equal to Xc2, and delta X1 is more than or equal to delta X2, and when delta X1 is less than delta X2, the optimized industrial steam supply flow rates of the two units to be optimized are respectively represented as 0 (No. 1 unit) and X2+ X1 (No. 2 unit).
In one embodiment, the power plant has two 310MW grade units, the steam source of the industrial steam supply is cold re-extraction steam, and the pressure of the industrial steam supply is 3.0 MPa. At present, the electric load and the heat load of the two units are 124MW of No. 1 unit electric load, 54/h of industrial steam supply, 186MW of No. 2 unit electric load and 54t/h of industrial steam supply respectively. The two units are directly used as the unit to be optimized without adjusting the units.
Through calculation, when the No. 1 unit has the electric load of 124MW and the industrial steam supply flow rate of 54t/h, the heat consumption of the unit is 8593 kJ/(kWh & h). The electric load of the No. 2 unit is 186MW, the industrial steam supply is 54t/h, and the heat consumption of the unit is 8182 kJ/(kWh.h).
The calculation shows that when the industrial extraction pressure is 3MPa, the critical economic flow of the unit electric load of 124MW is 68t/h, and the critical economic flow of the unit electric load of 186MW is 38 t/h.
When the above method is adopted for optimization control, the method specifically comprises the following steps:
step 301: initial parameters (54t/h, 124MW), (54t/h, 186MW) were input.
Step 302: xc 1-68 t/h and Xc 2-38 t/h.
Step 303: when the judgment result shows that X1 is 54t/h < Xc1 is 68t/h and X2 is 54t/h and not less than Xc2 is 38t/h, then the calculation results show that Δ X1 is Xc 1-X1 is 14t/h and Δ X2 is X2-Xc 2 is 54-38 is 16 t/h.
Step 304: and judging and determining that the delta X2 is equal to or more than 16t/h and equal to or more than delta X1 is equal to or more than 14t/h, calculating that X1 is equal to X1 and delta X1 is equal to 54+14 is equal to 68t/h, and X2 is equal to X2-delta X1 is equal to 54-14 is equal to 40 t/h.
Step 305: and judging and determining that X2' -1 is 40-1, 39t/h is more than or equal to Xc2, 38t/h, calculating that X1 is equal to X1' +1, 68+1, 69t/h, and X2 is equal to X2' -1, 40-1, 39 t/h.
Step 306: calculating (R1 "× Y1+ R2" × Y2)/(Y1+ Y2) ═ 8492 × 124+8247 × 186)/(124+186) ═ 8345kJ/(kW · h); (R1 × Y1+ R2 × Y2)/(Y1+ Y2) ((8502 × 124+8243 × 186)/(124+186) ((8347 kJ/(kW · h)), the economy after optimization is smaller than the economy before optimization.
Step 307: and judging again to determine that X2' -1-39-1-38 t/h is more than or equal to Xc 2-38 t/h, and calculating to obtain optimized flow rates of 70t/h and 38t/h respectively.
Step 308: and judging the economy according to the formula again, and calculating to obtain the economy after optimization of 8343kJ/(kW & h) and the economy before optimization of 8345kJ/(kW & h), so that the economy after optimization is smaller than that before optimization.
Step 309: and judging again to determine that X2' -1-38-1-37 t/h < Xc 2-38 t/h, the current state is maintained.
Therefore, through the formula, the optimal distribution of the industrial steam supply flow of the unit can be calculated, wherein the steam supply quantity X1 of the unit No. 1 is 70t/h, and the steam supply quantity X2 of the unit No. 2 is 38t/h, so that the steam demand of industrial users is met, and the economical efficiency of unit operation is ensured under the condition of safe unit operation.
After the above-mentioned method is adopted for the optimization control, and before the control, the economic indicators are shown in the following table 1:
TABLE 1
| Item content | Unit of | Original economic index of power plant | Post-economic index of optimized control method |
| Electric load of No. 1 unit | MW | 124 | 124 |
| Number 1 unit industrial steam supply | t/h | 54 | 70 |
| Heat loss of No. 1 unit | kJ/(kW·h) | 8593 | 8482 |
| Electric load of No. 2 unit | MW | 186 | 186 |
| Number 2 unit industrial steam supply | t/h | 54 | 38 |
| Heat loss of No. 2 unit | kJ/(kW·h) | 8182 | 8251 |
| Average equivalent heat consumption of power plant | kJ/(kW·h) | 8346 | 8343 |
As can be seen from Table 1, the original No. 1 unit has the electric load of 124MW, the industrial steam supply amount of 54t/h and the heat consumption of 8593 kJ/(kWh.h); the original No. 2 unit has the electric load of 186MW, the industrial steam supply amount of 54t/h and the heat consumption of 8182 kJ/(kWh & h); the equivalent average heat rate of the power plant is 8346 kJ/(kWh). The economic index of the power plant is optimized after the optimization control method is adopted.
Since the electric load is directly scheduled by the power grid, the distribution of the electric load is kept unchanged, the industrial steam supply of the unit No. 1 is adjusted to 70t/h from 54t/h, the industrial steam supply of the unit No. 2 is adjusted to 38t/h from 54t/h, and the equivalent average heat consumption of the power plant is reduced to 8343 kJ/(kWh-h) from 8346 kJ/(kWh-h), which is reduced by 3 kJ/(kWh-h).
Specifically, the critical economic flows of the unit under different working conditions are connected by a curve, namely the energy consumption critical characteristic curve of the unit. FIG. 3 is an energy consumption critical characteristic curve of the unit under different working conditions under the industrial extraction pressure of 3.0 MPa. The following tables 1-29 represent the operation and calculation data of the unit under different electric load and different thermal load conditions under the industrial extraction steam pressure of 3.0 MPa. Wherein, THA (turbine heat-acceptance) working condition is the heat consumption guarantee working condition of the steam turbine.
TABLE 13.0 MPa steam extraction pressure medium parameter and economic index of the unit under different THA working conditions and different industrial steam extraction flows
| Item | Unit | THA | THA-1t/h | THA-2t/h | THA-5t/h | THA-8t/h | THA-10t/h |
| Load(s) | MW | 310.0 | 310.0 | 310.0 | 310.0 | 310.0 | 310.0 |
| Main steam pressure | MPa | 16.7 | 16.7 | 16.7 | 16.7 | 16.7 | 16.7 |
| Main steam flow | kg/h | 941184 | 942056 | 942929 | 945546 | 948161 | 949903 |
| Enthalpy of main steam | kJ/kg | 3397 | 3397 | 3397 | 3397 | 3397 | 3397 |
| Inlet pressure of intermediate pressure cylinder | MPa | 3.33 | 3.33 | 3.33 | 3.32 | 3.32 | 3.31 |
| Pressure of extraction | MPa | 3.60 | 3.60 | 3.59 | 3.59 | 3.58 | 3.58 |
| Flow rate of extracted steam | kg/h | 0 | 1000 | 2000 | 5000 | 8000 | 10000 |
| Enthalpy of extraction | kJ/kg | 3031 | 3031 | 3031 | 3030 | 3029 | 3029 |
| Flow rate of industrial extraction steam | t/h | 0 | 1 | 2 | 5 | 8 | 10 |
| Heat loss of machine set | kJ/(kW·h) | 7892 | 7888 | 7885 | 7875 | 7865 | 7859 |
| Front-back pressure difference of middle adjusting door | MPa | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Table 23.0 MPa steam extraction pressure medium parameter and economic index of machine set under THA working condition different industrial steam extraction flow
| Item | Unit of | THA-15t/h | THA-20t/h | THA-30t/h | THA-40t/h | THA-50t/h |
| Load(s) | MW | 310.0 | 310.0 | 310.0 | 310.0 | 310.0 |
| Pressure of main steam | MPa | 16.7 | 16.7 | 16.7 | 16.7 | 16.7 |
| Main steam flow | kg/h | 954256 | 958605 | 967288 | 975951 | 984602 |
| Enthalpy of main steam | kJ/kg | 3397 | 3397 | 3397 | 3397 | 3397 |
| Inlet pressure of intermediate pressure cylinder | MPa | 3.30 | 3.30 | 3.28 | 3.26 | 3.25 |
| Pressure of extraction | MPa | 3.57 | 3.56 | 3.55 | 3.53 | 3.51 |
| Flow rate of extracted steam | kg/h | 15000 | 20000 | 30000 | 40000 | 50000 |
| Enthalpy of extraction | kJ/kg | 3027 | 3026 | 3023 | 3021 | 3018 |
| Flow rate of industrial extraction steam | t/h | 954256 | 958605 | 967288 | 975951 | 984602 |
| Heat loss of machine set | kJ/(kW·h) | 1218 | 1218 | 1219 | 1219 | 1220 |
| Front-back pressure difference of middle adjusting door | MPa | 772972 | 771183 | 767582 | 763951 | 760293 |
Medium parameters and economic indexes of unit under different industrial steam extraction flows under THA working conditions under steam extraction pressure of 33.0 MPa in table
TABLE 43.0 MPa extraction pressure medium parameters and economic indexes of 75% THA unit under different industrial extraction flows
Partial statistical data of unit under 75% THA working condition and different steam extraction flows under steam extraction pressure of 53.0 MPa in table and heat consumption calculation
Table 63.0 MPa extraction pressure, part statistical data of unit under 75% THA working condition and different extraction flow and heat consumption calculation
Table 73.0 MPa extraction pressure, partial statistical data of unit under 75% THA working condition and different extraction flow and calculated heat consumption
Partial statistical data of unit under different steam extraction flows under 860% THA working condition of meter and heat consumption calculation
Partial statistical data of unit under different steam extraction flows under 960% THA working condition of table and heat consumption calculation
Table 1060% THA working condition partial statistical data of unit under different steam extraction flows and heat consumption calculation
Partial statistical data of unit under different extraction steam flow rates under 1160% THA working condition of table and heat consumption calculation
Partial statistical data and heat consumption calculation of unit under 1260% THA working conditions and different steam extraction flows in table
Table 1360% THA working condition partial statistical data of machine set under different steam extraction flow and calculating heat consumption
Partial statistical data of unit under different steam extraction flows under table 1450% THA working condition and heat consumption calculation
Partial statistical data of unit under different extraction steam flow under table 1550% THA working condition and heat consumption calculation
Partial statistical data of unit under table 1650% THA working condition and different extraction steam flow rates and heat consumption calculation
Partial statistical data of unit under different extraction steam flow of table 1750% THA working condition and heat consumption calculation
Partial statistical data of unit under different extraction steam flow rates under table 1850% THA working condition and heat consumption calculation
Partial statistical data of unit under different steam extraction flows under 1950% THA working condition and heat consumption calculation
| Item | Unit of | 50％THA-260t/ |
50％THA-280t/ |
50％THA-300t/h |
| Load(s) | MW | 155.0 | 155.0 | 155.0 |
| Main steam pressure | MPa | 16.7 | 16.7 | 16.7 |
| Main steam flow | kg/h | 757224 | 776394 | 795608 |
| Enthalpy of main steam | kJ/kg | 3397 | 3397 | 3397 |
| Inlet pressure of intermediate pressure cylinder | MPa | 1.44 | 1.41 | 1.38 |
| Pressure of extraction | MPa | 3.00 | 3.00 | 3.00 |
| Flow rate of extracted steam | kg/h | 260000 | 280000 | 300000 |
| Enthalpy of extraction | kJ/kg | 3047 | 3042 | 3037 |
| Flow rate of industrial extraction steam | t/h | 260 | 280 | 300 |
| Heat loss of machine set | kJ/(kW·h) | 7159 | 7036 | 6913 |
| Front-back pressure difference of middle adjusting door | MPa | 1.33 | 1.36 | 1.40 |
Partial statistical data of unit under different steam extraction flows under table 2040% THA working condition and heat consumption calculation
Partial statistical data of unit under 2140% THA working condition and different extraction steam flow and calculated heat consumption
Partial statistical data of unit under different extraction steam flow under table 2240% THA working condition and heat consumption calculation
Partial statistical data of unit under different steam extraction flows under table 2340% THA working condition and heat consumption calculation
Partial statistical data of unit under different extraction steam flow of table 2440% THA working condition and heat consumption calculation
Partial statistical data of unit under different steam extraction flows under 2530% THA working conditions and heat consumption calculation
Partial statistical data of unit under different steam extraction flows under 2630% THA working condition and heat consumption calculation
Partial statistical data of unit under different steam extraction flows under table 2730% THA working conditions and heat consumption calculation
Partial statistical data of unit under different extraction steam flow of 2830% THA working condition of meter and heat consumption calculation
Partial statistical data of unit under 2930% THA working condition and different steam extraction flows and heat consumption calculation
| Item | Unit of | 30％THA-225t/ |
30％THA-250t/ |
30％THA-275t/ |
30％THA-300t/h |
| Load(s) | MW | 93.0 | 93.0 | 93.0 | 93.0 |
| Pressure of main steam | MPa | 13.5 | 14.2 | 14.9 | 15.7 |
| Main steam flow | kg/h | 551376 | 576728 | 602436 | 630090 |
| Enthalpy of main vapour | kJ/kg | 3432 | 3425 | 3417 | 3408 |
| Inlet pressure of intermediate pressure cylinder | MPa | 0.88 | 0.84 | 0.80 | 0.75 |
| Pressure of extracted steamForce of | MPa | 3.00 | 3.00 | 3.00 | 3.00 |
| Flow rate of extracted steam | kg/h | 225000 | 250000 | 275000 | 300000 |
| Enthalpy of extraction | kJ/kg | 3137 | 3122 | 3108 | 3093 |
| Flow rate of industrial extraction steam | t/h | 225 | 250 | 275 | 300 |
| Heat loss of machine set | kJ/(kW·h) | 7409 | 7185 | 6966 | 6779 |
| Front-back pressure difference of middle adjusting door | MPa | 1.90 | 1.93 | 1.97 | 2.02 |
An embodiment of the present invention further provides an optimal control device for a cogeneration unit, as shown in fig. 4, the device includes:
the optimization unit determining module is used for determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units; for details, reference is made to the corresponding parts of the above method embodiments, which are not described herein again.
The flow determining module is used for adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized and obtaining a plurality of distribution modes; for details, reference is made to the corresponding parts of the above method embodiments, which are not described herein again.
The critical flow determining module is used for calculating and obtaining the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode; for details, reference is made to the corresponding parts of the above method embodiments, which are not described herein again.
The optimization module is used for determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow; for details, reference is made to the corresponding parts of the above method embodiments, which are not described herein again.
And the comparison module is used for carrying out thermal economy comparison according to the industrial steam supply flow of the adjusting unit in each distribution mode and the corresponding optimized industrial steam supply flow of the unit to be optimized to obtain the industrial steam supply flow of each unit. For details, reference is made to the corresponding parts of the above method embodiments, and details are not repeated herein.
The optimal control device of the cogeneration unit provided by the embodiment of the invention determines the unit to be optimized and the adjusting unit based on the number of the cogeneration units, determines the industrial steam supply flow of the unit to be optimized according to the industrial steam supply flow of the adjusting unit, optimizes the industrial steam supply flow of the unit to be optimized by adopting a method of comparing the industrial steam supply flow with the industrial steam supply critical economic flow to obtain a plurality of distribution modes, judges the thermal economy of the plurality of distribution modes and finally obtains the optimal distribution mode. Therefore, through the optimization control device, the heat load of industrial steam supply among the units of the power plant can be reasonably planned, the running economy of the power plant is optimized, and the whole running economy, fineness and automation level of the power plant are improved.
The description of the functions of the optimal control device of the cogeneration unit provided by the embodiment of the invention refers to the description of the optimal control method of the cogeneration unit in the above embodiment in detail.
An embodiment of the present invention further provides a storage medium, as shown in fig. 5, on which a computer program 601 is stored, where the instructions, when executed by a processor, implement the steps of the optimal control method for a cogeneration unit in the foregoing embodiments. The storage medium is also stored with audio and video stream data, characteristic frame data, interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk Drive (Hard Disk Drive, abbreviated as HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk Drive (Hard Disk Drive, abbreviated as HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
An embodiment of the present invention further provides an electronic device, as shown in fig. 6, the electronic device may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 6 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 52, that is, implements the optimal control method of the cogeneration unit in the above method embodiment.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating device, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and when executed by the processor 51 perform the method for optimal control of a cogeneration unit as in the embodiment of figures 1-3.
The details of the electronic device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 3, and are not described herein again.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. An optimal control method for a cogeneration unit, comprising:
determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units;
adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized, and obtaining multiple distribution modes;
calculating to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode;
determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow;
and comparing the heat economy according to the industrial steam supply flow of the adjusting unit in each distribution mode and the corresponding industrial steam supply flow optimized by the unit to be optimized to obtain the industrial steam supply flow of each unit.
2. The optimal control method of the cogeneration unit according to claim 1, wherein determining the optimized industrial steam supply flow rate of the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate comprises:
When the industrial steam supply flow of the unit to be optimized is larger than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is larger than or equal to the corresponding industrial steam supply critical economic flow;
when the flow rate is larger than or equal to the preset flow rate, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of the other unit to be optimized, and judging whether the thermal economy after flow optimization is larger than that before optimization or not;
and when the current value is not more than the preset value, continuously optimizing the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow and judging the thermal economy until the optimized thermal economy is more than the thermal economy before optimization, and obtaining the optimized industrial steam supply flow of the unit to be optimized.
3. The optimal control method of the cogeneration unit according to claim 1, wherein the optimized industrial steam supply flow of the unit to be optimized is determined according to the relationship between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow, and further comprising:
when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow;
And adjusting the industrial steam supply flow of the unit to be optimized with a large difference value to be 0, and adding the industrial steam supply flow of the unit to be optimized with a small difference value and the industrial steam supply flow of the unit to be optimized with a large difference value to obtain the optimized industrial steam supply flow of the unit to be optimized.
4. The optimal control method of the cogeneration unit according to claim 1, wherein the optimized industrial steam supply flow of the unit to be optimized is determined according to the relationship between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow, and further comprising:
when the industrial steam supply flow rates of the two units to be optimized are respectively greater than or equal to and smaller than the corresponding industrial steam supply critical economic flow rate, judging the relationship between the industrial steam supply flow rate of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow rate;
judging whether the unit to be optimized corresponding to the industrial steam supply critical economic flow with the smaller difference value is smaller than the corresponding unit to be optimized;
when the steam supply flow rate of the two units to be optimized is smaller than the corresponding critical economic flow rate of the industrial steam supply, adjusting the industrial steam supply flow rate of the two units to be optimized according to a smaller difference value;
optimizing the adjusted industrial steam supply flow of the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after the flow optimization is greater than the economical efficiency before the optimization;
And when the steam supply flow is not larger than the preset value, continuously optimizing the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow and judging the economy until the economy after optimization is larger than that before optimization, and obtaining the optimized industrial steam supply flow of the unit to be optimized.
5. The optimal control method of the cogeneration unit according to claim 4, wherein the optimized industrial steam supply flow of the unit to be optimized is determined according to the relationship between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow, further comprising:
and when the smaller difference value corresponds to the unit to be optimized with the industrial steam supply critical economic flow more than or equal to the corresponding industrial steam supply critical economic flow, adjusting the industrial steam supply flow of the unit to be optimized with the larger difference value to be 0, adding the industrial steam supply flow of the unit to be optimized with the smaller difference value and the industrial steam supply flow of the unit to be optimized with the larger difference value to obtain the optimized industrial steam supply flow of the unit to be optimized.
6. The optimal control method of the cogeneration unit according to claim 1, wherein the step of calculating the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode comprises the steps of:
Determining the heat consumption of a pure condensing working condition unit and the heat consumption of an industrial steam supply working condition unit according to the output power of a generator terminal of the unit to be optimized;
and calculating to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the heat consumption of the pure condensing working condition unit and the heat consumption of the industrial steam supply working condition unit.
7. The optimal control method of the cogeneration unit according to claim 1, wherein the industrial steam supply flow of the adjusting unit is adjusted according to the total steam supply flow, the industrial steam supply flow of the unit to be optimized is determined, and a plurality of distribution modes are obtained, including:
sequentially adjusting the industrial steam supply flow of each unit in the adjusting units according to the total steam supply flow;
and determining the industrial steam supply flow of a group of units to be optimized according to the difference value between the industrial steam supply flow and the total steam supply flow of the adjusted units after each adjustment.
8. An optimal control device for a cogeneration unit, comprising:
the optimization unit determining module is used for determining any two units to be optimized and the rest adjusting units according to the number of the cogeneration units;
the flow determining module is used for adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized and obtaining a plurality of distribution modes;
The critical flow determining module is used for calculating and obtaining the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode;
the optimization module is used for determining the optimized industrial steam supply flow of the unit to be optimized according to the relation between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow;
and the comparison module is used for carrying out thermal economy comparison according to the industrial steam supply flow of the adjusting unit in each distribution mode and the corresponding industrial steam supply flow optimized by the unit to be optimized to obtain the industrial steam supply flow of each unit.
9. A computer-readable storage medium, characterized in that it stores computer instructions for causing the computer to execute the method for optimal control of a cogeneration unit according to any one of claims 1 to 7.
10. An electronic device, comprising: -a memory and a processor, communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method for optimal control of a cogeneration unit of any of claims 1 to 7.
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