CN119200713A - Secondary side temperature control method based on intelligent control valve - Google Patents
Secondary side temperature control method based on intelligent control valve Download PDFInfo
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Abstract
The invention relates to the technical field of automatic control flow metering, in particular to a secondary side temperature supply control method based on an intelligent control valve. The intelligent control valve opening degree control method comprises the steps of collecting water supply temperature and water return temperature, calculating water supply and return temperature difference and total water supply flow, constructing an intelligent control valve adjusting rate equation based on a reaction dynamics control theory, generating a primary opening degree adjusting signal, collecting temperature difference of each path on the secondary side by means of topology optimization control, calculating path flow, dynamically adjusting water supply distribution of each flow path, automatically switching a control mode by means of a phase state switching technology, controlling valve change rate by means of a smooth function, introducing a latent heat model to eliminate the temperature difference, and generating a total valve opening degree control signal by means of integrating the primary opening degree signal and the topology optimization result. The secondary side temperature supply control method based on the intelligent control valve realizes the dynamic adjustment of the valve based on the temperature difference of the water supply and return and the real-time distribution of the water supply flow of each path by combining the reaction dynamics control and the topology optimization control.
Description
Technical Field
The invention relates to the technical field of automatic control flow metering, in particular to a secondary side temperature supply control method based on an intelligent control valve.
Background
The secondary side temperature supply control method based on the intelligent control valve aims at realizing accurate temperature control and dynamic balance of a temperature supply system, and the dynamic adjustment of the opening degree of the valve and the self-adaptive distribution of the flow of each path are controlled by combining a reaction dynamics control theory and a topology optimization control strategy, so that the rapid response and the system stability under the change of the temperature supply requirement are realized.
The existing secondary side temperature supply control method is generally difficult to realize accurate flow distribution under different path temperature difference requirements, and because the valve adjustment rate is difficult to respond to the dynamic change of the temperature difference in real time, the problems of over adjustment or hysteresis can occur when the temperature difference fluctuates, the response speed of a temperature supply system is reduced, and the problems of uneven temperature and increased system energy consumption are easily caused, so the secondary side temperature supply control method based on the intelligent control valve is provided.
Disclosure of Invention
The invention aims to provide a secondary side temperature supply control method based on an intelligent control valve, so as to solve the problems that the dynamic change of the temperature difference is difficult to respond in real time due to the valve adjusting speed, the overshoot or the hysteresis occurs when the temperature difference fluctuates, the response speed of a temperature supply system is reduced, and the uneven temperature and the increase of the energy consumption of the system are easy to cause.
In order to achieve the above object, the present invention provides a secondary side temperature supply control method based on an intelligent control valve, comprising the following steps:
S1, collecting the current water supply temperature and the water return temperature, and calculating the water supply and return temperature difference and the total water supply flow;
s2, adopting a reaction dynamics control theory, taking a supply and return water temperature difference as a driving force, constructing an intelligent control valve dynamic adjustment rate equation, and generating a preliminary opening adjustment signal;
S3, adopting a topology optimization control idea, collecting sub-supply water temperature differences of all paths on the secondary side, calculating the flow of all paths on the secondary side, and dynamically adjusting the water supply flow of all flow paths by utilizing a flow control equation;
S4, dividing a control mode into a rapid adjustment state and a stable adjustment state according to the magnitude of a temperature difference threshold of the water supply and return, adopting a phase switching technology to automatically switch the control mode, using a smooth function to control the opening change rate of the valve, optimizing the switching of the control mode, and introducing a latent heat control model to eliminate the temperature difference of the water supply and return;
and S5, generating a total valve opening control signal to adjust the valve opening in real time based on the preliminary opening adjustment signal and the topology optimization result.
In the step S1, the current water supply temperature and the water return temperature are collected, and the water supply and return temperature difference and the total water supply flow are calculated, and the specific method is as follows:
S1.1, collecting the water supply temperature And backwater temperatureAnd calculate the temperature difference of the water supply and return:
;
S1.2, measuring total water supply flow using a flowmeter。
As a further improvement of the technical scheme, the reaction dynamics control theory is used for quantitatively controlling the response rate of the intelligent control valve according to the temperature difference of the water supply and return to realize the control of the opening of the valve;
In the step S2, a reaction dynamics control theory is adopted, a supply and return water temperature difference is used as a driving force, an intelligent control valve dynamic adjustment rate equation is constructed, a preliminary opening adjustment signal is generated, and the specific method comprises the following steps:
S2.1, defining the temperature difference of the water supply and return As a driving force;
S2.2, calculating and introducing a temperature difference reaction rate constant The temperature difference reaction rate constant is used to quantify the effect of the temperature difference on the valve opening adjustment:
;
;
Wherein, Is a frequency factor of the reaction rate; Is the activation energy; is a gas constant; Is the average value of the water supply and return temperature;
s2.3, based on the temperature difference reaction rate constant And the temperature difference of water supply and returnAnd (3) constructing an intelligent control valve dynamic adjustment rate equation:
;
Wherein, Dynamic adjustment speed for opening of the intelligent control valve; is an exponential factor of the rate of adjustment;
Setting the critical value of temperature difference of water supply and return When (when),Takes the value of 1 when,The value is 2;
S2.4, dynamically adjusting the speed according to the opening of the intelligent control valve Generating a preliminary opening adjustment signal:
;
Wherein, The signal is adjusted for the preliminary opening degree; the current opening of the intelligent control valve; Is a time increment.
As a further improvement of the technical scheme, in the step S3, a topology optimization control idea is adopted, sub-supply water temperature differences of each path on the secondary side are collected, flow rates of each path on the secondary side are calculated, and the flow rate control equation is utilized to dynamically adjust the water supply flow rate of each flow path, and the specific method comprises the following steps:
s3.1 dividing the secondary side into a plurality of flow paths, setting a first The water supply temperature of the flow path isThe return water temperature isWhereinThe number of the path is given by the number,,Is the total flow path number;
S3.2, calculate the first Temperature difference of sub-supply backwater of strip flow path:
;
Wherein, Is the firstThe sub-supply water temperature difference of the flow path;
S3.3, calculate the first Water supply flow ratio of the flow paths:
;
Wherein, Is the firstThe water supply flow ratio of the flow paths; In order to calculate the sum sequence number, ;
S3.4, calculate the firstWater supply flow rate of strip flow path:
;
Wherein, Is the firstThe water supply flow of the flow path;
s3.5, introducing flow regulating coefficient Establishing a flow control equation to dynamically adjust the water supply flow of each path flow, updating the water supply flow of each path flow in real time according to the flow change rate, and calculating the next time incrementFirst, theWater supply flow rate of strip flow path。
As a further improvement of the present technical solution, in S3.5, a flow rate adjustment coefficient is introducedEstablishing a flow control equation to dynamically adjust the water supply flow of each path flow, updating the water supply flow of each path flow in real time according to the flow change rate, and calculating the next time incrementFirst, theWater supply flow rate of strip flow pathThe specific method comprises the following steps:
;
;
Wherein, Is the firstThe water supply flow rate change rate of the flow path; setting a target temperature difference; Is a flow adjustment coefficient; For the next time increment First, theThe water supply flow of the flow path.
As a further improvement of the technical scheme, in S4, the control mode is divided into a "fast adjustment state" and a "stable adjustment state" according to the magnitude of the temperature difference threshold of the water supply and return, and the specific method is as follows:
s4.1.1, setting a supply and return water temperature difference threshold value For distinguishing between a "fast adjustment state" and a "steady adjustment state";
;
S4.1.2, dividing the control mode into a "fast adjustment state" and a "steady adjustment state", and defining the "fast adjustment state" and the "steady adjustment state" specifically as follows:
A rapid adjustment state, wherein the current temperature difference of the supplied water is larger than the temperature difference threshold of the supplied water, and the intelligent control valve enters the rapid adjustment state and needs to respond to the temperature supply requirement immediately;
And in a stable regulation state, the current temperature difference of the supplied water is smaller than or equal to the temperature difference threshold value of the supplied water, and the intelligent control valve enters the stable regulation state, so that the current temperature demand change is smaller.
As a further improvement of the technical scheme, in S4, a phase switching technology is adopted to automatically switch the control mode, a smoothing function is used to control the opening change rate of the intelligent control valve, the control mode is switched, and a latent heat control model is introduced to eliminate the temperature difference between the water supply and the return, and the specific method comprises the following steps:
S4.2.1, controlling the opening change rate of the intelligent control valve by using a smooth function:
Smoothing function:
;
Wherein, The valve opening change rate of the intelligent control valve is; is a smooth adjustment coefficient;
S4.2.2, when the control mode is in a 'quick adjustment state', introducing a latent heat control model to eliminate the temperature difference of the supplied water and the returned water:
latent heat control model:
;
Wherein, Additional flow for latent heat compensation; is equivalent heat capacity; The current water supply flow rate is the current water supply flow rate;
s4.2.3 result of eliminating temperature difference of water supply and return based on latent heat control model and current intelligent control valve opening And determining the final intelligent control valve opening according to the smoothing function。
As a further improvement of the technical scheme, S4.2.3, based on the result of eliminating the temperature difference of the supplied and returned water by the latent heat control model and the current opening degree of the intelligent control valveAnd determining the final intelligent control valve opening according to the smoothing functionThe specific method comprises the following steps:
;
Wherein, The valve opening of the current intelligent control valve; the valve opening of the valve is finally controlled intelligently.
As a further improvement of the present technical solution, in S5, based on the preliminary opening adjustment signal and the topology optimization result, a total valve opening control signal is generated to adjust the valve opening in real time, and the specific method steps are as follows:
S5.1, set up The weight of the traffic path isCalculate the firstOpening contribution of a flow path:
;
Wherein, Is the firstOpening contribution of the flow path;
s5.2, adjusting the signal based on the preliminary opening degree And (d)Opening contribution of a flow pathGenerating a total valve opening control signal;
S5.3, based on the total opening control signalAnd the valve opening of the current intelligent control valveCalculating the opening of the valve of the intelligent control valve of the next time increment。
As a further improvement of the present technical solution, in S5.2, the signal is adjusted based on the preliminary opening degreeAnd (d)Opening contribution of a flow pathGenerating a total valve opening control signalThe specific method comprises the following steps:
;
Wherein, Is a total valve opening control signal;
In S5.3, the control signal is based on the total opening degree And the valve opening of the current intelligent control valveCalculating the opening of the valve of the intelligent control valve of the next time incrementThe specific method comprises the following steps:
;
Wherein is The opening of the intelligent control valve of the next time increment.
Compared with the prior art, the invention has the beneficial effects that:
1. In the secondary side temperature supply control method based on the intelligent control valve, the temperature difference of the water supply and return is used as a driving force based on a reaction dynamics control theory, so that the opening adjustment rate of the valve can be dynamically calculated, the opening of the valve is accurately adjusted, the temperature difference change is quickly responded, the flexible regulation and control of the temperature supply system under different temperature difference requirements are realized, and the system is ensured to be kept in an optimal temperature supply state.
2. In the secondary side temperature supply control method based on the intelligent control valve, the temperature difference requirements of all paths are monitored in real time and flow distribution is adjusted through topology optimization control, so that the self-adaptive optimal distribution of water supply flow is realized, the accurate satisfaction of the temperature supply requirements of all paths is ensured, the over-regulation and hysteresis phenomenon are avoided, and the energy saving effect and the response efficiency of a temperature supply system are improved.
Drawings
FIG. 1 is a flow chart of the overall method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present embodiment provides a secondary side temperature supply control method based on an intelligent control valve, which includes the following steps:
S1, collecting the current water supply temperature and the water return temperature, and calculating the water supply and return temperature difference and the total water supply flow;
In this embodiment S1, the current water supply temperature and the water return temperature are collected, and the water supply and return temperature difference and the total water supply flow are calculated, and the specific method is as follows:
S1.1, collecting the water supply temperature And backwater temperatureAnd calculate the temperature difference of the water supply and return:
;
S1.2, measuring total water supply flow using a flowmeter。
In the present embodiment, the temperature difference of the supplied and returned water is obtained by measurement and calculationReflecting the temperature requirement of the current heating system, determining the direction and amplitude of the subsequent valve adjustment by the temperature difference of the water supply and return, and the total water supply flowIndicating the total amount of water entering the secondary side system, the sufficiency of the water supply can be ensured by measuring with a flow meter.
S2, adopting a reaction dynamics control theory, taking a supply and return water temperature difference as a driving force, constructing an intelligent control valve dynamic adjustment rate equation, and generating a preliminary opening adjustment signal;
the reaction dynamics control theory is used for quantitatively controlling the response rate of the intelligent control valve according to the temperature difference of the supplied water and the returned water, so as to realize the control of the opening of the valve;
in the embodiment S2, the reaction dynamics control theory is adopted, the temperature difference of the supplied water is used as the driving force, the intelligent control valve dynamic adjustment rate equation is constructed, and the preliminary opening adjustment signal is generated, and the specific method comprises the following steps:
S2.1, defining the temperature difference of the water supply and return As a driving force;
S2.2, calculating and introducing a temperature difference reaction rate constant The temperature difference reaction rate constant is used to quantify the effect of the temperature difference on the valve opening adjustment:
;
;
Wherein, Is a frequency factor of the reaction rate; Is the activation energy; is a gas constant; Is the average value of the water supply and return temperature;
In the present embodiment, the frequency factor of the reaction rate The valve response speed under a series of different temperature differences is obtained through experiments, and specific values are obtained through fitting, and the activation energy is obtainedDetermined by the response performance of the system under different temperature conditions, and the gas constantIs that;
S2.3, based on the temperature difference reaction rate constantAnd the temperature difference of water supply and returnAnd (3) constructing an intelligent control valve dynamic adjustment rate equation:
;
Wherein, Dynamic adjustment speed for opening of the intelligent control valve; is an exponential factor of the rate of adjustment;
Setting the critical value of temperature difference of water supply and return When (when),Takes the value of 1 when,The value is 2;
S2.4, dynamically adjusting the speed according to the opening of the intelligent control valve Generating a preliminary opening adjustment signal:
;
Wherein, The signal is adjusted for the preliminary opening degree; the current opening of the intelligent control valve; Is a time increment.
In this embodiment, the reaction kinetics control theory is a theoretical method derived from chemical reaction rates, and is used to describe dynamic response rates of a system under the action of different driving forces, and based on concepts such as reaction rate constants and reaction progression, the influence of the driving forces on the adjustment rate of the system is quantified;
the intelligent control valve dynamic adjustment rate equation is used for associating the temperature difference with the valve adjustment rate, so that the dynamic response to the temperature supply control is realized, and the opening of the valve can be automatically adjusted according to the change of the temperature difference.
S3, adopting a topology optimization control idea, collecting sub-supply water temperature differences of all paths on the secondary side, calculating the flow of all paths on the secondary side, and dynamically adjusting the water supply flow of all flow paths by utilizing a flow control equation;
In this embodiment S3, a topology optimization control idea is adopted, sub-supply water temperature differences of each path on the secondary side are collected, flow rates of each path on the secondary side are calculated, and water supply flow rates of each flow path are dynamically adjusted by using a flow control equation, and the specific method comprises the following steps:
s3.1 dividing the secondary side into a plurality of flow paths, setting a first The water supply temperature of the flow path isThe return water temperature isWhereinThe number of the path is given by the number,,Is the total flow path number;
S3.2, calculate the first Temperature difference of sub-supply backwater of strip flow path:
;
Wherein, Is the firstThe sub-supply water temperature difference of the flow path;
S3.3, calculate the first Water supply flow ratio of the flow paths:
;
Wherein, Is the firstThe water supply flow ratio of the flow paths; In order to calculate the sum sequence number, ;
S3.4, calculate the firstWater supply flow rate of strip flow path:
;
Wherein, Is the firstThe water supply flow of the flow path;
s3.5, introducing flow regulating coefficient Establishing a flow control equation to dynamically adjust the water supply flow of each path flow, updating the water supply flow of each path flow in real time according to the flow change rate, and calculating the next time incrementFirst, theWater supply flow rate of strip flow path。
In the embodiment, the topology optimization control idea is an optimization method for dynamically adjusting resource allocation according to system requirements and constraint conditions, and the optimization method is used for dynamically allocating water supply flow of a secondary side based on the temperature difference requirements of paths, so that each flow path can obtain the adaptive water supply flow according to the temperature difference conditions, thereby realizing accurate control and dynamic balance of a temperature supply system, realizing balancing temperature difference among paths, improving the response speed of the temperature supply system, reducing energy waste and ensuring that the system can adaptively optimize flow allocation according to the real-time temperature supply requirements;
In the embodiment, the system is divided into a plurality of flow paths, the temperature difference of each path is calculated, the system can identify the heat demand difference of different paths by acquiring the sub-supply water return temperature difference of each path on the secondary side, which is the basis of topology optimization, and the flow distribution is optimized by using the topology optimization control through the temperature difference, so that the system automatically adjusts the distribution proportion of the water supply flow according to the real-time heat demand, and finally the real-time distribution result of the flow of each path is output.
In this embodiment S3.5, a flow adjustment coefficient is introducedEstablishing a flow control equation to dynamically adjust the water supply flow of each path flow, updating the water supply flow of each path flow in real time according to the flow change rate, and calculating the next time incrementFirst, theWater supply flow rate of strip flow pathThe specific method comprises the following steps:
;
;
Wherein, Is the firstThe water supply flow rate change rate of the flow path; setting a target temperature difference; Is a flow adjustment coefficient; For the next time increment First, theThe water supply flow of the flow path.
In the present embodiment, the flow rate adjustment coefficientSetting control parameters according to system design requirements, and selecting based on characteristics of paths and required response speed;
introducing flow regulating coefficients For adjusting the response speed of each path to the temperature difference change, and the flow rate adjustment coefficientIn the control process, if the adjustment rates of the flow rates of all paths are the same, the over-adjustment or hysteresis phenomenon is easy to occur when the temperature difference changes, and the flow adjustment coefficient is introducedThe flow response speed can be flexibly adjusted according to the specific condition of the path, and excessive or untimely adjustment is avoided.
S4, dividing a control mode into a rapid adjustment state and a stable adjustment state according to the magnitude of a temperature difference threshold of the water supply and return, adopting a phase switching technology to automatically switch the control mode, using a smooth function to control the opening change rate of the valve, optimizing the switching of the control mode, and introducing a latent heat control model to eliminate the temperature difference of the water supply and return;
In this embodiment S4, the control modes are divided into a "fast adjustment state" and a "steady adjustment state" according to the magnitude of the temperature difference threshold of the water supply and return, and the specific method is as follows:
s4.1.1, setting a supply and return water temperature difference threshold value For distinguishing between a "fast adjustment state" and a "steady adjustment state";
;
S4.1.2, dividing the control mode into a "fast adjustment state" and a "steady adjustment state", and defining the "fast adjustment state" and the "steady adjustment state" specifically as follows:
A rapid adjustment state, wherein the current temperature difference of the supplied water is larger than the temperature difference threshold of the supplied water, and the intelligent control valve enters the rapid adjustment state and needs to respond to the temperature supply requirement immediately;
And in a stable regulation state, the current temperature difference of the supplied water is smaller than or equal to the temperature difference threshold value of the supplied water, and the intelligent control valve enters the stable regulation state, so that the current temperature demand change is smaller.
In this embodiment, the switching between the control mode between the "fast adjustment state" and the "steady adjustment state" is implemented using a phase switching technique, so as to ensure that the system can respond to the temperature difference change in real time.
In the embodiment S4, a phase switching technology is adopted to automatically switch the control mode, a smoothing function is used to control the opening change rate of the intelligent control valve, the control mode is switched in an optimized manner, and a latent heat control model is introduced to eliminate the temperature difference between the water supply and the return, and the specific method comprises the following steps:
S4.2.1, controlling the opening change rate of the intelligent control valve by using a smooth function:
Smoothing function:
;
Wherein, The valve opening change rate of the intelligent control valve is; is a smooth adjustment coefficient;
in the present embodiment, the adjustment coefficient is smoothed The specific value of (2) can be determined through experimental data or system parameter debugging;
S4.2.2, when the control mode is in a 'quick adjustment state', introducing a latent heat control model to eliminate the temperature difference of the supplied water and the returned water:
latent heat control model:
;
Wherein, Additional flow for latent heat compensation; is equivalent heat capacity; The current water supply flow rate is the current water supply flow rate;
s4.2.3 result of eliminating temperature difference of water supply and return based on latent heat control model and current intelligent control valve opening And determining the final intelligent control valve opening according to the smoothing function。
In this embodiment S4.2.3, the result of eliminating the temperature difference of the supply and return water based on the latent heat control model and the current valve opening of the intelligent control valveAnd determining the final intelligent control valve opening according to the smoothing functionThe specific method comprises the following steps:
;
Wherein, The valve opening of the current intelligent control valve; the valve opening of the valve is finally controlled intelligently.
In the embodiment, the latent heat control model independently acts on the water supply flow to accelerate the temperature difference elimination, and the opening change rate of the valve is not directly influenced, so that the subsequent valve opening adjustment is indirectly influenced;
In this embodiment, the final intelligent control valve opening degree The smooth function control makes the opening change more stable during the switching process from the fast regulating state to the stable regulating state, and prevents the sharp fluctuation of the opening during the mode switchingThe method is used for realizing stable transition in the mode switching process, namely an instantaneous opening degree generated by a smoothing function and a latent heat control model when the system is switched from a fast adjustment state to a stable adjustment state or vice versa, and has the function of ensuring that the opening degree of the valve can be stably adjusted in the mode switching process, avoiding unstable system caused by abrupt opening degree change and not participating in the subsequent calculation of the real-time adjustment of the opening degree of the valve.
S5, generating a total valve opening control signal to adjust the valve opening in real time based on the preliminary opening adjustment signal and the topology optimization result;
in this embodiment S5, based on the preliminary opening adjustment signal and the topology optimization result, a total valve opening control signal is generated to adjust the valve opening in real time, and the specific method steps are as follows:
S5.1, set up The weight of the traffic path isCalculate the firstOpening contribution of a flow path:
;
Wherein, Is the firstOpening contribution of the flow path;
s5.2, adjusting the signal based on the preliminary opening degree And (d)Opening contribution of a flow pathGenerating a total valve opening control signal;
S5.3, based on the total opening control signalAnd the valve opening of the current intelligent control valveCalculating the opening of the valve of the intelligent control valve of the next time increment。
In this embodiment S5.2, the signal is adjusted based on the preliminary opening degreeAnd (d)Opening contribution of a flow pathGenerating a total valve opening control signalThe specific method comprises the following steps:
;
Wherein, Is a total valve opening control signal;
In this embodiment S5.3, the control signal is controlled based on the total opening And the valve opening of the current intelligent control valveCalculating the opening of the valve of the intelligent control valve of the next time incrementThe specific method comprises the following steps:
;
Wherein is The opening of the intelligent control valve of the next time increment.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed.
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