CN115031287B - Prediction method, device, control equipment and storage medium for double-valve switching of heating power station - Google Patents
Prediction method, device, control equipment and storage medium for double-valve switching of heating power station Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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Abstract
The invention provides a method, a device, control equipment and a storage medium for predicting double-valve switching of a heating power station, wherein the method is applied to the heating power station, and the heating power station is provided with a large regulating valve and a small regulating valve, and comprises the following steps: when the switching condition of the size regulating valve is reached, predicting whether valve switching is carried out or not through a prediction model to obtain a prediction result, wherein the switching condition of the size regulating valve is that only the small regulating valve is in an open state and the opening of the small regulating valve is increased to a first preset opening value, or the switching condition is that only the large regulating valve is in an open state and the opening of the large regulating valve is reduced to a second preset opening value; if the predicted result is that the valve is not switched, the switching action of the size regulating valve is not performed, and the heating load is continuously regulated and controlled through the regulating valve in the current opening state. The invention can avoid frequent switching of the size regulating valve in the application scene of double-valve regulation of the heating power station, prolong the service life of the valve and improve the regulation precision.
Description
Technical Field
The invention relates to the technical field of heat supply control, in particular to a heat station double-valve switching prediction method, a heat station double-valve switching prediction device, control equipment and a storage medium.
Background
In the application of the design of the heating power station system, in order to expand the range of the regulation and control of the heat load to meet the requirements of working conditions, a method generally adopted is to install two regulating valves with different pipe diameters on the primary side water supply or return pipeline of the heating power station, and small valves are adopted for regulation and control under the condition of smaller load demand, and large valves can be adopted for regulation and control step by step along with the increase of the load demand.
However, when the thermal load demand is just about the small valve and the large valve to float up and down in the thermal load regulation process, frequent switching of the size regulating valve is caused, so that disturbance problem in the switching process affects regulation precision, and the service life of the valve is also affected.
Disclosure of Invention
In view of the above, the invention provides a method, a device, a control device and a storage medium for predicting the switching of double valves of a heating power station, which can solve the problem of frequent switching of size regulating valves in the application scene of double regulating valves of the heating power station.
In a first aspect, an embodiment of the present invention provides a method for predicting switching between two valves in a thermal power station, where the thermal power station is provided with a large regulating valve and a small regulating valve, where the large regulating valve and the small regulating valve are installed on a primary water supply pipeline of the thermal power station, or the large regulating valve and the small regulating valve are installed on a primary water return pipeline of the thermal power station, and a pipe diameter of the large regulating valve is greater than a pipe diameter of the small regulating valve, where the method includes:
when a size-adjusting valve switching condition is reached, predicting whether valve switching is performed or not through a preset prediction model to obtain a prediction result, wherein the size-adjusting valve switching condition is that only the small adjusting valve is in an open state and the opening of the small adjusting valve is increased to a first preset opening value, or the size-adjusting valve switching condition is that only the large adjusting valve is in an open state and the opening of the large adjusting valve is reduced to a second preset opening value;
and if the predicted result is that the valve is not switched, the switching action of the size regulating valve is not performed, and the heating load regulation and control is continuously performed through the regulating valve in the current opening state.
In one possible implementation manner, the process for constructing the prediction model includes:
obtaining multiple groups of historical data, establishing a training set, wherein for each group of historical data, the input value of the historical data comprises an error value of a target moment, an opening value of a regulating valve of each of two regulating periods positioned before the target moment and an error value of the period, the output value of the historical data is used for switching a valve or not, wherein the target moment is the moment of loading the regulating valve switching condition, the error value is used for representing the difference value of a heating load actual value and a heating load target value,
and training the neural network model through the training set to obtain the prediction model.
In one possible implementation manner, when the size adjustment valve switching condition is reached, predicting whether to perform valve switching through a preset prediction model, and obtaining a prediction result includes:
and inputting the error value of the current moment, the opening value of the regulating valve of each of two periods positioned before the current moment and the error value of the period into the prediction model to obtain the prediction result.
In one possible implementation, if the prediction result is that the valve is switched, the method further includes:
when only the small regulating valve is in an open state and the opening of the small regulating valve is increased to a first preset opening value, the opening of the small regulating valve is controlled to be reduced by taking the large regulating valve and the small regulating valve as an actuating mechanism through a preset feedforward controller and taking the heat supply load as an object, and the opening of the large regulating valve is controlled to be increased, wherein the feedforward controller comprises a feedback controller and a feedforward controller, the feedback controller performs PID (proportion integration differentiation) regulation according to a heat supply load set value and a heat supply load feedback value, and the feedforward controller performs proportional regulation according to the opening variation of the small regulating valve, and the feedforward amount of the feedforward controller is equal to the opening reduction value multiplied by a first proportional value of the small regulating valve;
when only the large regulating valve is in an open state and the opening degree of the large regulating valve is reduced by a second preset opening degree value, the feed-forward feedback controller takes the large regulating valve and the small regulating valve as an actuating mechanism, takes a heat supply load as an object, controls the opening degree of the small regulating valve to be increased and controls the opening degree of the large regulating valve to be reduced, wherein the feedback controller performs PID regulation according to a heat supply load set value and a heat supply load feedback value, the feed-forward controller performs proportion regulation according to the opening degree variation of the large regulating valve, and the feed-forward quantity of the feed-forward controller is equal to the opening degree reduction value multiplied by a second proportion value of the large regulating valve.
In one possible implementation manner, the first preset opening value is a maximum opening value of the small adjusting valve, the second preset opening value is a preset critical opening value, and the determining process of the first proportion value includes:
establishing a second working condition with the same flow as that under a first working condition, wherein only the small regulating valve is in an open state under the first working condition, the opening of the small regulating valve is in a maximum opening value, and only the large regulating valve is in an open state under the second working condition;
and obtaining the reciprocal of the opening value of the large regulating valve under the second working condition, taking the large regulating valve and the small regulating valve as an executing mechanism through a preset feedforward feedback controller, taking the heat supply load as an object, controlling the opening of the small regulating valve to be reduced, and controlling the opening of the large regulating valve to be increased, obtaining an error value and an error change rate of the heat supply load, taking the error value and the error change rate as input values of a fuzzy rule table, obtaining an output result, and adding the output result and the reciprocal to obtain the first ratio.
In one possible implementation, the second ratio value and the first ratio value are reciprocal.
In one possible implementation manner, the preset critical opening value satisfies a preset formula, where the preset formula is α 1 P 1 ≤K≤α 2 P 1 Wherein alpha is 1 For representing a first predetermined coefficient, alpha 2 For representing a second preset coefficient, P 1 For representing said adjusted first scale value, K for representingThe preset critical opening value is more than 0 and less than alpha 1 < 1,0 < alpha 2 < 1, and alpha 1 ＜α 2 。
In a second aspect, an embodiment of the present invention provides a dual-valve switching prediction apparatus for a thermal station, where the apparatus is applied to the thermal station, and the thermal station is provided with a large adjusting valve and a small adjusting valve, where the large adjusting valve and the small adjusting valve are installed on a primary water supply pipeline of the thermal station, or the large adjusting valve and the small adjusting valve are installed on a primary water return pipeline of the thermal station, and a pipe diameter of the large adjusting valve is larger than a pipe diameter of the small adjusting valve, where the apparatus includes: a prediction module and a control module;
the prediction module is used for predicting whether valve switching is performed or not through a preset prediction model when a size-adjusting valve switching condition is reached, so as to obtain a prediction result, wherein the size-adjusting valve switching condition is that only the small adjusting valve is in an open state and the opening of the small adjusting valve is increased to a first preset opening value, or the size-adjusting valve switching condition is that only the large adjusting valve is in an open state and the opening of the large adjusting valve is reduced to a second preset opening value;
And the control module is used for continuing to regulate and control the heating load through the regulating valve in the current opening state without performing the switching action of the size regulating valve if the predicted result is that the valve is not switched.
In a third aspect, an embodiment of the present invention provides a control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to the first aspect or any one of the possible implementations of the first aspect, when the computer program is executed by the processor.
In a fourth aspect, embodiments of the present invention provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above in the first aspect or any one of the possible implementations of the first aspect.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
according to the embodiment of the invention, through presetting a prediction model, when the switching condition of the size regulating valve is reached in the application scene of double-valve regulation of the heating power station, whether the valve is switched or not is predicted through the preset prediction model, if the prediction result is that the valve is not switched, the heating load regulation is continuously carried out through the regulating valve in the current opening state, so that the frequent switching of the size regulating valve is avoided, the service life of the valve is prolonged, and the regulation precision is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an application scenario diagram of a heat station double-valve switching prediction method provided by an embodiment of the invention;
FIG. 2 is a flow chart of an implementation of a method for predicting switching of two valves of a heating power station according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a feedforward-feedback controller according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a heat station dual-valve switching prediction device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a control device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is an application scenario diagram of a thermal station double-valve switching prediction method provided by an embodiment of the invention. As shown in fig. 1, the primary side water supply pipeline of the heating station is provided with a large regulating valve and a small regulating valve, the pipe diameter of the large regulating valve is larger than that of the small regulating valve, the small regulating valve is adopted for regulating and controlling when the heating load demand is smaller, and the large regulating valve and the small regulating valve can be adopted for regulating and controlling step by step and simultaneously along with the increase of the heating load demand. Under the application scene of double-valve regulation of a heating power station:
in the first application scenario, the regulation and control of the small regulating valve is switched to the regulation and control of the large regulating valve;
in the second application scenario, the regulation and control of the large regulating valve is switched to the simultaneous regulation and control of the large regulating valve and the small regulating valve, and the cutting-in of the small valve is involved at the moment;
in the third application scenario, the size regulating valve is regulated and controlled and switched to the large regulating valve at the same time, and the cutting-out of the small valve is involved at the moment;
and in the fourth application scenario, the regulation and control of the large regulating valve is switched to the regulation and control of the small regulating valve.
For the second application scenario, only the cutting-in of the small regulating valve is involved, and for the third application scenario, only the cutting-out of the small regulating valve is involved, and the two regulating processes are smooth, so that the method provided by the embodiment of the invention only aims at the phenomenon that the size regulating valve is frequently switched when the heat supply load is just in the vicinity of the regulating critical values of the small regulating valve and the large regulating valve and floats up and down in the process of mutually switching the size regulating valve in the first application scenario and the fourth application scenario under the double-valve regulating application scenario of the heating power station. In order to solve this problem, referring to fig. 2, a flowchart of an implementation of the method for predicting switching between two valves of a heat station according to an embodiment of the present invention is shown, and details are as follows:
In step 201, when the switching condition of the size adjustment valve is reached, predicting whether to switch the valve by using a preset prediction model to obtain a prediction result, where the switching condition of the size adjustment valve is that only the small adjustment valve is in an open state and the opening of the small adjustment valve is increased to a first preset opening value, or the switching condition of the size adjustment valve is that only the large adjustment valve is in an open state and the opening of the large adjustment valve is reduced to a second preset opening value.
As shown in fig. 1, the method provided by the embodiment of the invention is applied to a heating power station, wherein a large regulating valve and a small regulating valve are arranged on the heating power station, the large regulating valve and the small regulating valve are arranged on a primary side water supply pipeline of the heating power station, or the large regulating valve and the small regulating valve are arranged on a primary side water return pipeline of the heating power station, and the pipe diameter of the large regulating valve is larger than that of the small regulating valve. Fig. 1 only shows an application scenario in which a size adjusting valve is simultaneously installed in a primary side water supply pipeline, and the method provided by the embodiment of the invention can also be applied to an application scenario in which a size adjusting valve is simultaneously installed in a primary side water return pipeline.
In one possible implementation, the process of constructing the prediction model includes: and acquiring a plurality of groups of historical data, and establishing a training set, wherein for each group of historical data, the input value of the historical data comprises an error value of a target moment, an opening value of an adjusting valve of each of two adjusting and controlling periods positioned before the target moment and an error value of the period, and the output value of the historical data is used for valve switching or is not used for valve switching, wherein the target moment is the moment of a load size adjusting valve switching condition, the error value is used for representing the difference value between a heating load actual value and a heating load target value, and the neural network model is trained through the training set to obtain a prediction model.
In the embodiment of the invention, the opening of the regulating valve is regulated once in a regulating period, the opening of the regulating valve is fixed after the regulating valve is regulated once in the regulating period, at this time, the difference value between the actual heating load value and the target heating load value is obtained by measuring and other modes, and the error value of the regulating valve is obtained, for example, when only the small regulating valve is in an open state, the regulating valve is regulated along with the increase of the heating load, in the first regulating period, the opening of the small regulating valve is K1, the error value in the regulating period is e1, in the second regulating period, the opening of the small regulating valve is K2, the error value in the regulating period is e2, when the third regulating period is reached, the opening value of the small regulating valve reaches the maximum opening value corresponding to the small regulating valve, at this time, the switching condition of the small regulating valve is reached, the error value e0 is recorded, K1, K2, e1, e2 and e0 form the input value of a group of history data in training set, in the history data, after the small regulating valve is switched to the switching condition of the large regulating valve is reached, namely, the switching is carried out, whether the switching is necessary is carried out in a short time, or not, if switching is necessary, switching is carried out in a short time, and if switching is unnecessary, switching is not necessary. For example, after the switching, the large regulating valve is switched back to the small regulating valve in the next regulating period, the switching is unnecessary, the output value of the set of historical data is set to be the output value of the set of historical data, and the valve switching is not performed.
In one possible implementation, the output value of the prediction model is 0 if no valve switching is performed, and is 1 if valve switching is performed.
The neural network model is learned through a training set, and the parameter weight coefficient value of the neural network model is continuously adjusted by comparing the output result of the prediction model with the actual regulation result until the prediction accuracy reaches a preset accuracy, for example, the prediction accuracy reaches more than 99%, and the training of the prediction model is completed and can be put into use.
In the actual use process, when the switching condition of the size regulating valve is reached, the error value of the current moment, the opening value of the regulating valve of each of two periods positioned before the current moment and the error value of the period are input into the prediction model, so that a prediction result is obtained.
In step 202, if the prediction result is that the valve is not switched, the switching action of the size regulating valve is not performed, and the heating load is continuously regulated and controlled through the regulating valve in the current opening state.
In the embodiment of the invention, the first preset opening value is taken as an example of the maximum opening value allowed by the small regulating valve, the maximum opening value allowed by the small regulating valve is assumed to be 100%, when only the small regulating valve is in an open state and the opening value of the small regulating valve is 100%, the switching condition that the small regulating valve is switched to the large regulating valve is reached, at this time, if the predicted result is 0, the switching is unnecessary, and the large regulating valve is reversely switched to the small regulating valve in a short time, the valve switching is not carried out at this time, and the small regulating valve keeps 100% of opening for regulation.
In one possible implementation, if the prediction result is that the valve is switched, the method further includes:
when only the small regulating valve is in an open state and the opening of the small regulating valve is increased to a first preset opening value, the large regulating valve and the small regulating valve are taken as actuating mechanisms through a preset feedforward feedback controller, the heat supply load is taken as an object, the opening of the small regulating valve is controlled to be reduced, and the opening of the large regulating valve is controlled to be increased, wherein the feedforward feedback controller comprises a feedback controller and a feedforward controller, the feedback controller performs PID (proportion integration differentiation) regulation according to a heat supply load set value and a heat supply load feedback value, the feedforward controller performs proportion regulation according to the opening variation of the small regulating valve, and the feedforward amount of the feedforward controller is equal to the opening reduction value of the small regulating valve multiplied by a first proportion value;
when only the large regulating valve is in an open state and the opening degree of the large regulating valve is reduced by a second preset opening degree value, the large regulating valve and the small regulating valve are taken as actuating mechanisms through a feedforward feedback controller, the heating load is taken as an object, the opening degree of the small regulating valve is controlled to be increased, and the opening degree of the large regulating valve is controlled to be reduced, wherein the feedback controller performs PID (proportion integration differentiation) regulation according to a heating load set value and a heating load feedback value, the feedforward controller performs proportion regulation according to the opening degree variation of the large regulating valve, and the feedforward amount of the feedforward controller is equal to the opening degree reduction value of the large regulating valve multiplied by a second proportion value.
The adjustment of the feedback control is based on the deviation of the control, however, the feedback control cannot overcome the disturbance, and the fluctuation generated by the controlled variable can be shown after a period of time passes after the disturbance enters the system before the controlled variable deviates from the set value. The feedforward control is an open loop control capable of compensating for a specified disturbance amount. Based on this, fig. 3 shows a schematic structural diagram of a feedforward-feedback controller, and in combination with fig. 3, in the embodiment of the present invention, feedforward control and feedback control are combined to form a feedforward-feedback controller, which is applied to an application scenario of switching a big valve and a small valve of a thermal station, so that advantages of timely feedforward control action can be exerted, and advantages of overcoming various disturbances and detecting controlled quantity by feedback control can be realized.
In the embodiment of the invention, the feedback controller is regulated by adopting a PID algorithm, and the feedforward controller is directly regulated by adopting a proportional algorithm. When only the small regulating valve is in an open state in the regulating process and the opening of the small regulating valve reaches the regulating limit, in one possible implementation manner, the opening of the small regulating valve reaches 100% of the opening, and the small regulating valve is required to be switched to the large regulating valve at the moment, which belongs to the first application scenario. At this time, the feedforward feedback controller takes the large regulating valve and the small regulating valve as executing mechanisms, takes the heat supply load as an object, controls the opening degree of the small regulating valve to be reduced, and controls the opening degree of the large regulating valve to be increased, wherein the feedforward feedback controller comprises a feedback controller and a feedforward controller, the feedback controller carries out PID regulation according to the heat supply load set value and the heat supply load feedback value, the feedforward controller carries out proportional regulation according to the opening degree variation of the small regulating valve, and the feedforward amount of the feedforward controller is equal to the opening degree reduction value of the small regulating valve multiplied by the first proportional value.
In the embodiment of the invention, the first ratio value uses P 1 And (3) representing.
In the embodiment of the invention, when only the large regulating valve is in an open state and the opening of the large regulating valve is reduced to a preset critical opening value K, the large regulating valve needs to be regulated and controlled to be switched to the small regulating valve for regulation and control at the moment, and the method belongs to the fourth application scenario. At this time, the large regulating valve and the small regulating valve are used as executing mechanisms through the feedforward feedback controller, the heating load is used as an object, the opening of the small regulating valve is controlled to be increased, and the opening of the large regulating valve is controlled to be reduced, wherein the feedback controller performs PID regulation according to the heating load set value and the heating load feedback value, the feedforward controller performs proportion regulation according to the opening variation of the large regulating valve, and the feedforward quantity of the feedforward controller is equal to the opening reduction value multiplied by the second proportion value of the large regulating valve.
In the embodiment of the invention, the second proportion value uses P 2 And (3) representing.
In one possible implementation manner, the first preset opening value is a maximum opening value of the small regulating valve, the second preset opening value is a preset critical opening value, and the determining process of the first proportion value includes:
establishing a second working condition with the same flow as the first working condition, wherein only the small regulating valve is in an open state under the first working condition, the opening of the small regulating valve is in a maximum opening value, and only the large regulating valve is in an open state under the second working condition;
And obtaining the reciprocal of the opening value of the large regulating valve under the second working condition, taking the large regulating valve and the small regulating valve as an actuating mechanism through a preset feedforward feedback controller, taking the heat supply load as an object, controlling the opening of the small regulating valve to be reduced, and controlling the opening of the large regulating valve to be increased, obtaining the error value and the error change rate of the heat supply load, taking the error value and the error change rate as the input value of a fuzzy rule table, obtaining an output result, and adding the output result and the reciprocal to obtain the first proportion value.
Theoretically, P 1 The value of (2) is approximately equal to the reciprocal of the opening value of the large regulating valve under the equal flow condition when the opening of the small regulating valve is 100%, and the calculated P can be possibly caused due to the time variability disclosed by the heating power station 1 The value of (2) cannot be adapted to the actual working condition, resulting in adjustmentThe control accuracy is lower. In order to further improve regulation and control precision and reduce disturbance caused by sudden change of thermal load in a switching application scene of a size regulating valve of a thermal station, in the embodiment of the invention, a feedforward feedback controller takes a large regulating valve and a small regulating valve as an actuating mechanism, and takes a heat supply load as an object, and the error value and the error change rate of the heat supply load are obtained in the processes of controlling the opening of the small regulating valve to be reduced and controlling the opening of the large regulating valve to be increased; taking the error value and the error change rate as input values of a fuzzy rule table to obtain an output result; and adding the output result with the reciprocal of the opening value of the large regulating valve under the second working condition to obtain a first proportional value.
That is, the reciprocal of the opening value of the large regulating valve under the second working condition is the first proportional value obtained by theoretical calculation, and in the embodiment of the invention, the first proportional value P obtained by theoretical calculation is realized by the fuzzy controller 1 Is adjusted so that P 1 The value of the (C) is more in line with the actual working condition, and the regulation and control precision is further improved. Since during the process of switching the small regulating valve to the large regulating valve, if P 1 If smaller, the error value e and the error change rate deltae of the thermodynamic load during the switching process will be negative, if P 1 If the error value e and the error change rate delta e of the thermal load in the switching process are larger, the error value e and the error change rate delta e in the switching process are positive values, so that an output result delta K is obtained according to the error value e and the error change rate delta e in the switching process as input values of the fuzzy rule table d Will delta K d And adding the increment value to the reciprocal of the opening value of the large regulating valve under the second working condition to obtain a regulated first proportional value.
The adjusted first ratio value is more in line with the actual working condition, and is beneficial to improving the regulation precision.
In one possible implementation, the second ratio value and the first ratio value are reciprocal, and the second ratio value P is obtained by taking the reciprocal of the first ratio value 2 Is a value of (2).
In one possible implementation, the preset critical opening value satisfies a preset formula, where the preset formula is α 1 P 1 ≤K≤α 2 P 1 Wherein alpha is 1 For representing a first predetermined coefficient, alpha 2 For representing a second preset coefficient, P 1 For representing the adjusted first proportional value, K for representing the preset critical opening value, 0 < alpha 1 ＜1，0＜α 2 < 1, and alpha 1 ＜α 2 。
In one possible implementation, α 1 ＝0.7，α 2 ＝0.85。
If the heating load demand is just in the small regulating valve and the big regulating valve and controls the critical value nearby and float from top to bottom, then can cause the frequent switching of big regulating valve, not only influence the regulation and control precision, even cause the influence to the valve life.
To solve this problem, in an embodiment of the present invention, the K value is selected to be α 1 P 1 ≤K≤α 2 P 1 Within a range of interval, e.g. 0.7P 1 To 0.85P 1 In addition, after the large regulating valve is switched to the small regulating valve, the opening value regulated by the small regulating valve is between 70% and 85%, and good regulation and control performance is achieved, so that when the large regulating valve is switched to the small regulating valve, a certain regulation and control space exists between the opening value of the small regulating valve and the switching critical value of the small regulating valve by 100%, if the thermal load is increased at the moment, the opening of the small regulating valve can be further increased, the small regulating valve can not be immediately switched back to the large regulating valve, a hysteresis interval exists in the switching of the large regulating valve, the problem that the large regulating valve is frequently switched is further solved, and the service life of the valve is prolonged.
According to the invention, through presetting a prediction model, when the switching condition of the size regulating valve is reached in the application scene of double-valve regulation of the heating power station, whether the valve is switched or not is predicted through the preset prediction model, if the prediction result is that the valve is not switched, the heating load regulation is continuously carried out through the regulating valve in the current opening state, so that the frequent switching of the size regulating valve is avoided, the service life of the valve is prolonged, and the regulation precision is improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 4 shows a schematic structural diagram of a heat station dual-valve switching prediction device according to an embodiment of the present invention, and for convenience of explanation, only the parts related to the embodiment of the present invention are shown, which is described in detail below:
as shown in fig. 4, the double-valve switching prediction device 4 for a thermal station is applied to a thermal station, in which a large regulating valve and a small regulating valve are installed, wherein the large regulating valve and the small regulating valve are installed on a primary side water supply pipeline of the thermal station, or the large regulating valve and the small regulating valve are installed on a primary side water return pipeline of the thermal station, and the pipe diameter of the large regulating valve is larger than that of the small regulating valve, and the device comprises: a prediction module 41 and a control module 42;
The prediction module 41 is configured to predict whether to perform valve switching by using a preset prediction model when a size-adjusting valve switching condition is reached, so as to obtain a prediction result, where the size-adjusting valve switching condition is that only the small-adjusting valve is in an open state and the opening of the small-adjusting valve is increased to a first preset opening value, or the size-adjusting valve switching condition is that only the large-adjusting valve is in an open state and the opening of the large-adjusting valve is decreased to a second preset opening value;
and the control module 42 is configured to, if the prediction result indicates that the valve is not to be switched, not to switch the size regulating valve, and continuously regulate the heating load through the regulating valve currently in the open state.
According to the embodiment of the invention, through presetting a prediction model, when the switching condition of the size regulating valve is reached in the application scene of double-valve regulation of the heating power station, whether the valve is switched or not is predicted through the preset prediction model, if the prediction result is that the valve is not switched, the heating load regulation is continuously carried out through the regulating valve in the current opening state, so that the frequent switching of the size regulating valve is avoided, the service life of the valve is prolonged, and the regulation precision is improved.
In one possible implementation, the prediction module 41 is further configured to:
obtaining multiple groups of historical data, establishing a training set, wherein for each group of historical data, the input value of the historical data comprises an error value of a target moment, an opening value of a regulating valve of each of two regulating periods positioned before the target moment and an error value of the period, the output value of the historical data is used for switching a valve or not, wherein the target moment is the moment of a load magnitude regulating valve switching condition, the error value is used for representing the difference value of a heating load actual value and a heating load target value,
and training the neural network model through the training set to obtain a prediction model.
In one possible implementation, the prediction module 41 is further configured to:
and inputting the error value at the current moment, the opening value of the regulating valve in each of two periods before the current moment and the error value of the period into a prediction model to obtain a prediction result.
In one possible implementation, if the predicted result is a valve switch, the control module 42 is further configured to:
when only the small regulating valve is in an open state and the opening of the small regulating valve is increased to a first preset opening value, the large regulating valve and the small regulating valve are taken as actuating mechanisms through a preset feedforward feedback controller, the heat supply load is taken as an object, the opening of the small regulating valve is controlled to be reduced, and the opening of the large regulating valve is controlled to be increased, wherein the feedforward feedback controller comprises a feedback controller and a feedforward controller, the feedback controller performs PID (proportion integration differentiation) regulation according to a heat supply load set value and a heat supply load feedback value, the feedforward controller performs proportion regulation according to the opening variation of the small regulating valve, and the feedforward amount of the feedforward controller is equal to the opening reduction value of the small regulating valve multiplied by a first proportion value;
When only the large regulating valve is in an open state and the opening degree of the large regulating valve is reduced by a second preset opening degree value, the large regulating valve and the small regulating valve are taken as actuating mechanisms through a feedforward feedback controller, the heating load is taken as an object, the opening degree of the small regulating valve is controlled to be increased, and the opening degree of the large regulating valve is controlled to be reduced, wherein the feedback controller performs PID (proportion integration differentiation) regulation according to a heating load set value and a heating load feedback value, the feedforward controller performs proportion regulation according to the opening degree variation of the large regulating valve, and the feedforward amount of the feedforward controller is equal to the opening degree reduction value of the large regulating valve multiplied by a second proportion value.
In one possible implementation, the first preset opening value is a maximum opening value of the small adjustment valve, the second preset opening value is a preset critical opening value, and the control module 42 is further configured to:
establishing a second working condition with the same flow as the first working condition, wherein only the small regulating valve is in an open state under the first working condition, the opening of the small regulating valve is in a maximum opening value, and only the large regulating valve is in an open state under the second working condition;
and obtaining the reciprocal of the opening value of the large regulating valve under the second working condition, taking the large regulating valve and the small regulating valve as an actuating mechanism through a preset feedforward feedback controller, taking the heat supply load as an object, controlling the opening of the small regulating valve to be reduced, and controlling the opening of the large regulating valve to be increased, obtaining the error value and the error change rate of the heat supply load, taking the error value and the error change rate as the input value of a fuzzy rule table, obtaining an output result, and adding the output result and the reciprocal to obtain the first proportion value.
In one possible implementation, the second ratio value and the first ratio value are reciprocal.
In one possible implementation, the preset critical opening value satisfies a preset formula, where the preset formula is α 1 P 1 ≤K≤α 2 P 1 Wherein alpha is 1 For representing a first predetermined coefficient, alpha 2 For representing a second preset coefficient, P 1 For representing the adjusted first proportional value, K for representing the preset critical opening value, 0 < alpha 1 ＜1，0＜α 2 < 1, and alpha 1 ＜α 2 。
The heat station double-valve switching prediction device provided in this embodiment can be used to execute the heat station double-valve switching prediction method embodiment, and its implementation principle and technical effects are similar, and the embodiment is not repeated here.
Fig. 5 is a schematic diagram of a control apparatus according to an embodiment of the present invention. As shown in fig. 5, the control apparatus 5 of this embodiment includes: a processor 50, a memory 51 and a computer program 52 stored in said memory 51 and executable on said processor 50. The processor 50, when executing the computer program 52, implements the steps of the various embodiments of the thermal station double valve switch prediction method described above, such as steps 201 through 202 shown in fig. 2. Alternatively, the processor 50 may perform the functions of the modules/units of the apparatus embodiments described above, such as the functions of the prediction module 41 to the control module 42 shown in fig. 4, when executing the computer program 52.
By way of example, the computer program 52 may be partitioned into one or more modules/units that are stored in the memory 51 and executed by the processor 50 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 52 in the control device 5.
The control device 5 may be a controller in a heating system. The control device 5 may include, but is not limited to, a processor 50, a memory 51. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the control device 5 and does not constitute a limitation of the control device 5, and may include more or less components than illustrated, or may combine certain components, or different components, e.g., the control device may also include an input-output device, a network access device, a bus, etc.
The processor 50 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the control device 5, such as a hard disk or a memory of the control device 5. The memory 51 may also be an external storage device of the control device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the control device 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the control device 5. The memory 51 is used for storing the computer program and other programs and data required by the control device. The memory 51 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/control device and method may be implemented in other manners. For example, the apparatus/control device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of the two-valve switching prediction method embodiment of each heating power station when the computer program is executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (9)
1. The utility model provides a heating power station double valve switches prediction method which characterized in that, this method is applied to a heating power station, and this heating power station installs big governing valve and little governing valve, wherein, big governing valve and little governing valve install in this heating power station primary side water supply line, perhaps, big governing valve and little governing valve install in this heating power station primary side return line, big governing valve's pipe diameter is greater than little governing valve's pipe diameter, this method includes:
when a size-adjusting valve switching condition is reached, predicting whether valve switching is performed or not through a preset prediction model to obtain a prediction result, wherein the size-adjusting valve switching condition is that only the small adjusting valve is in an open state and the opening of the small adjusting valve is increased to a first preset opening value, or the size-adjusting valve switching condition is that only the large adjusting valve is in an open state and the opening of the large adjusting valve is reduced to a second preset opening value;
If the predicted result is that the valve is not switched, the switching action of the size regulating valve is not performed, and the heating load regulation and control are continuously performed through the regulating valve in the current opening state;
if the prediction result is that the valve is switched, when only the small regulating valve is in an open state and the opening of the small regulating valve is increased to a first preset opening value, the opening of the small regulating valve is controlled to be reduced and the opening of the large regulating valve is controlled to be increased by taking the large regulating valve and the small regulating valve as actuating mechanisms through a preset feedforward feedback controller, wherein the feedforward feedback controller comprises a feedback controller and a feedforward controller, the feedback controller performs PID (proportion-dependent regulation) according to a heating load set value and a heating load feedback value, and the feedforward controller performs proportion regulation according to the opening variation of the small regulating valve, and the feedforward amount of the feedforward controller is equal to the opening reduction value multiplied by a first proportion value of the small regulating valve;
if the prediction result is that the valve is switched, when only the large regulating valve is in an open state and the opening degree of the large regulating valve is reduced by a second preset opening degree value, the feed-forward feedback controller takes the large regulating valve and the small regulating valve as an actuating mechanism, takes the heat supply load as an object, controls the opening degree of the small regulating valve to be increased and controls the opening degree of the large regulating valve to be reduced, wherein the feedback controller performs PID (proportion integration differentiation) regulation according to the heat supply load set value and the heat supply load feedback value, the feed-forward controller performs proportional regulation according to the opening degree variation of the large regulating valve, and the feed-forward quantity of the feed-forward controller is equal to the opening degree reduction value multiplied by a second proportional value of the large regulating valve.
2. The method of claim 1, wherein the process of constructing the predictive model comprises:
obtaining multiple groups of historical data, establishing a training set, wherein for each group of historical data, the input value of the historical data comprises an error value of a target moment, an opening value of a regulating valve of each of two regulating periods positioned before the target moment and an error value of the period, the output value of the historical data is used for switching a valve or not, wherein the target moment is the moment of loading the regulating valve switching condition, the error value is used for representing the difference value of a heating load actual value and a heating load target value,
and training the neural network model through the training set to obtain the prediction model.
3. The method according to claim 2, wherein predicting whether to perform valve switching by a preset prediction model when the size-adjusting valve switching condition is reached, the obtaining a prediction result includes:
and inputting the error value of the current moment, the opening value of the regulating valve of each of two periods positioned before the current moment and the error value of the period into the prediction model to obtain the prediction result.
4. The method of claim 1, wherein the first preset opening value is a maximum opening value of the small regulator valve, the second preset opening value is a preset critical opening value, and the determining of the first proportional value includes:
establishing a second working condition with the same flow as that under a first working condition, wherein only the small regulating valve is in an open state under the first working condition, the opening of the small regulating valve is in a maximum opening value, and only the large regulating valve is in an open state under the second working condition;
and obtaining the reciprocal of the opening value of the large regulating valve under the second working condition, taking the large regulating valve and the small regulating valve as an executing mechanism through a preset feedforward feedback controller, taking the heat supply load as an object, controlling the opening of the small regulating valve to be reduced, and controlling the opening of the large regulating valve to be increased, obtaining an error value and an error change rate of the heat supply load, taking the error value and the error change rate as input values of a fuzzy rule table, obtaining an output result, and adding the output result and the reciprocal to obtain the first ratio.
5. The method of claim 4, wherein the second ratio value and the first ratio value are reciprocal.
6. The method of claim 4, wherein the predetermined threshold opening value satisfies a predetermined formula, the predetermined formula being α 1 P 1 ≤K≤α 2 P 1 Wherein alpha is 1 For representing a first predetermined coefficient, alpha 2 For representing a second preset coefficient, P 1 For representing the adjusted first proportional value, K for representing the preset critical opening value, 0 < alpha 1 ＜1，0＜α 2 < 1, and alpha 1 ＜α 2 。
7. The utility model provides a heating power station double valve switches prediction unit, its characterized in that, the device is applied to a heating power station, and big governing valve and little governing valve are installed to this heating power station, wherein, big governing valve with little governing valve installs in this heating power station primary side water supply line, perhaps, big governing valve with little governing valve installs in this heating power station primary side return line, big governing valve's pipe diameter is greater than little governing valve's pipe diameter, the device includes: a prediction module and a control module;
the prediction module is used for predicting whether valve switching is performed or not through a preset prediction model when a size-adjusting valve switching condition is reached, so as to obtain a prediction result, wherein the size-adjusting valve switching condition is that only the small adjusting valve is in an open state and the opening of the small adjusting valve is increased to a first preset opening value, or the size-adjusting valve switching condition is that only the large adjusting valve is in an open state and the opening of the large adjusting valve is reduced to a second preset opening value;
The control module is used for not performing the switching action of the size regulating valve if the predicted result is that the valve is not switched, and continuously performing heat supply load regulation and control through the regulating valve in the current opening state;
the control module is further configured to, if the prediction result is that the valve is switched, when only the small regulating valve is in an open state and the opening of the small regulating valve is increased to a first preset opening value, control the opening of the small regulating valve to decrease and control the opening of the large regulating valve to increase by taking the heat supply load as an object through a preset feedforward feedback controller, wherein the feedforward feedback controller includes a feedback controller and a feedforward controller, the feedback controller performs PID regulation according to a heat supply load set value and a heat supply load feedback value, the feedforward controller performs proportional regulation according to an opening variation of the small regulating valve, and the feedforward amount of the feedforward controller is equal to the opening reduction value multiplied by the first proportional value of the small regulating valve;
and the control module is further used for controlling the opening of the small regulating valve to be increased and controlling the opening of the large regulating valve to be reduced if the predicted result is that the valve is switched, when only the large regulating valve is in an open state and the opening of the large regulating valve is reduced by a second preset opening value, taking the large regulating valve and the small regulating valve as an actuating mechanism through a feedforward feedback controller, taking the heating load as objects, controlling the opening of the small regulating valve to be increased and controlling the opening of the large regulating valve to be reduced, wherein the feedback controller performs PID (proportion integration differentiation) regulation according to a heating load set value and a heating load feedback value, and the feedforward controller performs proportion regulation according to the opening variation of the large regulating valve, wherein the feedforward quantity of the feedforward controller is equal to the opening reduced value of the large regulating valve multiplied by a second proportion value.
8. A control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of the preceding claims 1 to 6.
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| CN207907347U (en) * | 2018-02-24 | 2018-09-25 | 北京新城国泰能源科技有限公司 | The setting structure of thermal substation primary side electric control valve |
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| CN114879482A (en) * | 2022-06-01 | 2022-08-09 | 工大科雅（天津）能源科技有限公司 | Heating power station double-valve switching control method and device, control equipment and storage medium |
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| CN207907347U (en) * | 2018-02-24 | 2018-09-25 | 北京新城国泰能源科技有限公司 | The setting structure of thermal substation primary side electric control valve |
| CN109405059A (en) * | 2018-11-14 | 2019-03-01 | 天津市热电有限公司 | The energy saving regulator control system of pipe network dynamic load intelligent pressure regulating difference and regulation method |
| CN114135708A (en) * | 2021-11-02 | 2022-03-04 | 珠海爱迪生智能家居股份有限公司 | Control method of ERV automatic temperature control valve and ERV automatic temperature control valve |
| CN114879482A (en) * | 2022-06-01 | 2022-08-09 | 工大科雅（天津）能源科技有限公司 | Heating power station double-valve switching control method and device, control equipment and storage medium |
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