CN109556176A - A kind of heating terminal intelligent on-off valve regulation method based on dual time-step - Google Patents
A kind of heating terminal intelligent on-off valve regulation method based on dual time-step Download PDFInfo
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- CN109556176A CN109556176A CN201811197811.XA CN201811197811A CN109556176A CN 109556176 A CN109556176 A CN 109556176A CN 201811197811 A CN201811197811 A CN 201811197811A CN 109556176 A CN109556176 A CN 109556176A
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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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
The invention discloses a kind of heating terminal intelligent on-off valve regulation methods based on dual time-step for belonging to indoor environmental condition control technical field.The method includes determining dual time-step, including first time step-length and the second time step；Based on first time step-length, duty ratio prediction model is established, the valve opening duty ratio in the following room temperature control period is predicted；Based on the second time step, optimize the make-and-break time sequence of each user.The present invention can be realized flexibly with dual time-step to the synergic adjustment of the different response frequency variables such as room temperature, flow, reached each family room temperature and adjusted polynary control target fast and reliable, that heating system waterpower is stable.Compensate for the deficiencies of room temperature in the adjusting method of existing heating system end adjusts easy lag, waterpower is unstable.Match with the control characteristic of building and heating system, and simple and easy, is convenient for engineer application.
Description
Technical field
The invention belongs to indoor environmental condition control technical field more particularly to a kind of heating end intelligence based on dual time-step
It can on-off valve regulation method.
Background technique
The effective room temperature regulation in heating system end is realized, for meeting user's diversification heat demand, avoiding heat wave
Expense is of great significance.Since 2012, on-off time area method has obtained larger in the area such as Jilin, Hebei, Beijing
The application of scale.On-off time area method acts control by the intelligently connecting or disconnecting valve completely open and close installed at each family consumer heat inlet
The water that heats of registering one's residence is made, and then realizes that room temperature is adjusted.However, in the prior art, most of heating system ends only have hardware
Has intelligently connecting or disconnecting regulatory function, corresponding intelligently connecting or disconnecting equipment not yet plays effective adjustment effect.To find out its cause, mainly existing
In lacking the adjusting method for adapting to big inertia heating system terminal intelligent on-off, so that most temperature based on on-off time area method
The adjusting method of control product is all made of position formula on-off valve regulation common in fan coil cooling unit.And radiator, flooring radiation
The thermal inertia of equal heating systems is much larger than fan coil cooling unit, and inertia big in this way to adjust easy lag, leads to room
Warm overshoot.Therefore, there need to be the heating system of larger thermal inertia and time lag for radiator etc., exploring new has
The room temperature of forecast function regulates and controls method.In addition, terminal intelligent on-off valve regulation, not only directly affects the control of heat user room temperature, simultaneously
Have an effect on the hydraulic regime of heat supply network.For example, the intelligently connecting or disconnecting method based on duty ratio prediction may lead the same of user group and open
With closing, cause heat supply network hydraulic regime unstable.Therefore, also need to break through the unitary control thinking for only having single household room temperature in mind at present, knot
Computerized information and control technology are closed, the optimum ideals of terminal intelligent on-off valve regulation strategy are widened, from entire heating system angle
Take into account the multiple-objection optimization of each family room temperature, system hydraulic regime.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of heating terminal intelligent on-off valve regulation side based on dual time-step
Method, which comprises the following steps:
Step 1: determining dual time-step, including first time step-length and the second time step, the first time step-length
The period is controlled for room temperature, the second time step is make-and-break time step-length；
Step 2: being based on first time step-length, establish duty ratio prediction model, and survey room temperature and user according to history
Room temperature sets curve, predicts the valve opening duty ratio in the following room temperature control period, to realize the room of multiple users
Temperature control system；
Step 3: being based on the second time step, optimize the make-and-break time sequence of each user, to realize entire heating system
Waterpower is stablized.
Affiliated step 1 determines the detailed process of dual time-step are as follows:
Step 1-1: building thermal characteristics, heating system thermal characteristics and the requirement of room temperature control range are considered, when calculating first
Between step-length, its calculation formula is:
In formula, Δ T1For first time step-length；TdThe equivalent time constant controlled for heating system room temperature under design conditions；
Indoor temperature rise when Δ t is end heat dissipation equipment investment design heat；δ is that room temperature controls maximum allowable fluctuation range, such as room temperature
When permission undulating value is ± 0.5 DEG C, δ takes 1 DEG C；
Step 1-2: it calculates the second time step and passes through control in the case where meeting on-off valve minimum make and break period restrictive condition
The water flowing time is less than the water time swap of heat dissipation equipment, so that hot water is sufficiently radiated in heat dissipation equipment, second time step
Long calculation formula are as follows:
Tmin≤ΔT2≤T3 (2)
In formula, Δ T2For the second time step；T3For the water time swap of each heating user's branch；TminMost for control valve
Small make and break period limitation；
Step 1-3: the proportionate relationship of first time step-length Yu the second time step is established, is obtained:
ΔT1=n × Δ T2 (3)
In formula, n is the integer greater than 1.
The calculation formula of the duty ratio prediction model are as follows:
Di+1=Di+ΔDi+1 (4)
ΔDi+1=f3(ta,i-1,ta,i,tset,i+1) (5)
In formula, DiPeriod valve opening duty ratio is controlled for i-th of room temperature；ΔDi+1Period valve is controlled for i+1 to open
Open the correction value of duty ratio；ta,iThe actual measurement room temperature in period is controlled for i-th of room temperature；tset,i+1Week is controlled for i+1 room temperature
The setting room temperature of phase；Function f3() indicate duty ratio correction value and history room temperature rate of change, room temperature and setting value deviation it
Between relationship, pass through fuzzy control table or online adaptive control learning algorithm and establish.
The step 3 optimizes each family make-and-break time sequence, that is, meets the duty ratio predicted in step 2, passes through introducing
Random factor is uniformly distributed the make-and-break time sequence at each family at random, and then realizes hydraulic regime homogenization, specific optimization process
Are as follows:
It is n in first time step-length by the second time step number scale for including, the valve opening of duty cycle condition will be met
Time step number scale is m, then:
M=INT (n × Di+1)=INT (Δ T1/ΔT2×Di+1) (6)
In formula, INT indicates that logarithm carries out round；
The make-and-break time sequence for meeting duty ratio at this time has N kind arrangement mode, its calculation formula is:
It is 1,2,3 ..., N by the arrangement mode number consecutively of N kind make-and-break time sequence, is uniformly distributed rule according to random
A random integers M between 1~N is generated as random factor, when by on-off under the random integers M reference numeral
Between sequence be determined as the make-and-break time sequence of active user.
The beneficial effects of the present invention are:
The present invention is flexibly transported by comprehensive study buildings thermal process and the inherent mechanism of heating system component controls process
The synergic adjustment to the different response frequency variables such as room temperature, flow is realized with dual time-step, is reached each family room temperature and is adjusted quickly
Reliably, the stable polynary control target of heating system waterpower.Duty ratio prediction and the second time step under first time step-length
The method for introducing random factor optimization make-and-break time sequence compensates for room temperature in the adjusting method of existing heating system end and adjusts easily
Lag, the deficiencies of waterpower is unstable.This method and the control characteristic of building and heating system match, and simple and easy, are convenient for
Engineer application.
Detailed description of the invention
Attached drawing 1 (a) is the presetting procedure chart of dual time-step；
Attached drawing 1 (b) is end on-off PREDICTIVE CONTROL procedure chart；
Attached drawing 2 is dual time-step on-off valve regulation schematic diagram；
Attached drawing 3 is building and heating system Synthetic Simulation Platform in embodiment；
Attached drawing 4 is heating season typical case day room change curve；
Attached drawing 5 is typical day heating system flow changing curve；
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
In order to overcome existing heating system end on-off valve regulation method to control hysteresis quality, system hydraulic instability in room temperature
Etc. the problem of, the present invention proposes that a kind of terminal intelligent on-off valve regulation method based on dual time-step, this method breach
The unitary control method for only having single household room temperature in mind considers from entire heating system, realizes that multiple user's room temperatures adjust reliable, system
The polynary optimization aims such as waterpower stabilization.Shown in the flow chart of the method such as Fig. 1 (a), (b), firstly, being based on interior heating system
Thermal characteristics and control response specificity analysis carry out the dual time-step of room temperature control valve presetting；Secondly, pre- in end on-off
During observing and controlling system, room thermostat sets the information such as curve, room temperature history measured value according to weather forecast data, room temperature,
In following certain prediction time domain, duty ratio prediction is carried out, to realize that room temperature control is reliable timely；Finally, utilizing on-off controller
Built-in random Uniform Number generator is given at the make-and-break time sequence for meeting duty ratio in the following room temperature control period, with reality
Existing heating system waterpower homogenization.Specifically includes the following steps:
Step 1: determine dual time-step, with realize the coordination of buildings thermal process and each component controls process of heating system with
It is unified.The dual time-step includes first time step-length and the second time step.As shown in Fig. 2, first time step-length is room
Temperature control period, the second time step are make-and-break time step-length, specifically include following sub-step:
Step 1-1: consider building thermal inertia, architectural exterior-protecting construction thermal characteristics and the requirement of room temperature control range, calculate
First time step-length is low frequency response variable, can fully consider building thermal inertia since room temperature is mainly influenced by buildings thermal process
Taking the longer control period is first time step-length.It is special that the determination of first time step-length depends on different architectural exterior-protecting construction thermal technologies
Property and room temperature control range requirement.When building and heating system thermal inertia are bigger or room temperature control range is bigger, the control of use
Period processed can be longer.The calculation formula of the first time step-length are as follows:
In formula, Δ T1For first time step-length, value is carried out as close possible to right side threshold limit value；TdIndicate design conditions
The equivalent time constant of lower heating system room temperature control, Δ t indicate indoor temperature rise when end heat dissipation equipment investment design heat,
TdThe mode of control l-G simulation test or theoretical calculation can be used with Δ t to determine；δ is that room temperature controls maximum allowable fluctuation range,
As room temperature allow undulating value be ± 0.5 DEG C when, δ takes 1 DEG C；
According to the actual measurement of multiple buildings and analog result, when the control period takes 30min, indoor temperature fluctuation can be stablized at ± 0.5 DEG C
Within range.
Step 1-2: calculating the second time step, since the parameters such as flow are mainly special by the control of heating end and on-off valve
Property influence, be high frequency response variable, use relatively small control time step for the second time step.Meeting on-off valve minimum
Under make and break period restrictive condition, the water time swap of heat dissipation equipment is less than by the control water flowing time, sets hot water in heat dissipation
It sufficiently radiates in standby, the calculation formula of second time step are as follows:
Tmin≤ΔT2≤T3 (2)
In formula, Δ T2For the second time step；T3 is the water time swap of each heating user's branch；TminFor control valve
Minimum make and break period limitation；Water time swap and the limitation of control valve minimum make and break period of each heating user's branch are taken into account, the
Two time steps can use 5min or so.
Step 1-3: the proportionate relationship of first time step-length Yu the second time step is established, is obtained:
ΔT1=n × Δ T2 (3)
In formula, n is the integer greater than 1.
Step 2: being based on first time step-length, establish duty ratio prediction model, and survey room temperature and user according to history
Room temperature sets curve, predicts the valve opening duty ratio in the following room temperature control period, to realize the room of multiple users
Temperature control system；The calculation formula of the duty ratio prediction model are as follows:
Di+1=Di+ΔDi+1 (4)
ΔDi+1=f3(ta,i-1,ta,i,tset,i+1) (5)
In formula, DiPeriod valve opening duty ratio is controlled for i-th of room temperature；ΔDi+1Period valve is controlled for i+1 to open
Open the correction value of duty ratio；ta,iThe actual measurement room temperature in period is controlled for i-th of room temperature；tset,i+1Week is controlled for i+1 room temperature
The setting room temperature of phase；Function f3() indicate duty ratio correction value and history room temperature rate of change, room temperature and setting value deviation it
Between relationship, pass through fuzzy control table or online adaptive control learning algorithm and establish.
Step 3: being based on the second time step, optimize the make-and-break time sequence of each user, to realize entire heating system
Waterpower is stablized.Each family make-and-break time sequence of the optimization meets the duty ratio predicted in step 2, by introduce it is random because
Son is uniformly distributed the make-and-break time sequence at each family at random, and then realizes hydraulic regime homogenization, and the duty ratio refers to one
In a room temperature control period, total duration of valve opening and the ratio for controlling the period, specific optimization process are as follows:
It is n in first time step-length by the second time step number scale for including, the valve opening of duty cycle condition will be met
Time step number scale is m, then:
M=INT (n × Di+1)=INT (Δ T1/ΔT2×Di+1) (6)
In formula, INT indicates that logarithm carries out round.
The make-and-break time sequence for meeting duty ratio at this time has N kind arrangement mode, its calculation formula is:
It is 1,2,3 ..., N by the arrangement mode number consecutively of N kind make-and-break time sequence, is uniformly distributed rule according to random
A random integers M between 1~N is generated as random factor, when by on-off under the random integers M reference numeral
Between sequence be determined as the on-off instruction in the following control period.
Embodiment 1
The present embodiment relies on building and heating system Synthetic Simulation Platform as shown in Figure 3, to terminal intelligent tune of the present invention
Room variation and heating system changes in flow rate under section method carry out dynamic analog, to examine feasibility and control of the invention
Effect processed.
Assuming that user's setting value at room temperature is 20 DEG C, then the heating terminal intelligent on-off valve regulation method of the present embodiment includes following
Step:
(1) dual time-step is determined.First time step-length considers that architectural exterior-protecting construction thermal inertia and heating room by heating control permit
Perhaps deviation takes 30min；Second time step takes into account water time swap and the control valve minimum on-off week of heating user's branch
Time limit system takes 3min.
(2) in room thermostat, the built-in following interior duty ratio prediction of room temperature control period (first time step-length)
Intelligent algorithm.Room thermostat acquires the parameters such as history room temperature measured value, setting value at room temperature, using fuzzy control or adaptively
The online self-correction of learning algorithm realization duty ratio.The present embodiment provides following fuzzy control table by taking FUZZY ALGORITHMS FOR CONTROL as an example
Carry out duty ratio amendment.
1 duty ratio correction value (Δ D of tablei+1) conversion fuzzy control table
Duty ratio correction value is obtained by upper table, obtains the duty ratio predicted value in next control period as the following formula.
Di+1=Di+ΔDi+1 (8)
(3) intelligent open/close controller is input parameter by the duty ratio that above step obtains, is selected by random number generator
Select the make-and-break time sequence for generating next control period.
For example, there are 10 kinds of arrangement modes for all possible make-and-break time sequence when requiring duty ratio is 10%:
1000000000,0100000000,0010000000,0001000000 ..., and the probability that each arrangement mode occurs is
10%.It is 1~10 that each mode is numbered respectively, while by random whole between random number generator generation one 1~10
It counts, the make-and-break time sequence under the corresponding number of the random integers is determined as the make-and-break time sequence of active user.
It (4) is defeated with hourly weather data, building thermal technique parameter, user's setting value at room temperature, each parameters of operating part of heating system
Enter, under the effect of above-mentioned end intelligent control method, carries out the full working scope control process analogue simulation of heating season.
Attached drawing 4 and attached drawing 5 are using certain room of the invention and heating system changes in flow rate analog result, from Fig. 4
It can be controlled substantially within the range of setting value ± 0.5 DEG C with can be seen that room temperature in Fig. 5, flowed fluctuation is gentle, will not go out substantially
Existing flow system flow substantially Spline smoothing the case where.
This embodiment is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (4)
1. a kind of heating terminal intelligent on-off valve regulation method based on dual time-step, which comprises the following steps:
Step 1: determining that dual time-step, including first time step-length and the second time step, the first time step-length are room
Temperature control period, the second time step are make-and-break time step-length；
Step 2: being based on first time step-length, establish duty ratio prediction model, and survey room temperature and user's room temperature according to history
Curve is set, the valve opening duty ratio in the following room temperature control period is predicted, to realize the room temperature control of multiple users
System；
Step 3: being based on the second time step, optimize the make-and-break time sequence of each user, to realize the waterpower of entire heating system
Stablize.
2. a kind of heating terminal intelligent on-off valve regulation method based on dual time-step according to claim 1, feature
It is, affiliated step 1 determines the detailed process of dual time-step are as follows:
Step 1-1: consider building thermal characteristics, heating system thermal characteristics and the requirement of room temperature control range, calculate and walk at the first time
It is long, its calculation formula is:
In formula, Δ T1For first time step-length；TdThe equivalent time constant controlled for heating system room temperature under design conditions；Δ t is
Indoor temperature rise when end heat dissipation equipment investment design heat；δ is that room temperature controls maximum allowable fluctuation range, as room temperature allows wave
When dynamic value is ± 0.5 DEG C, δ takes 1 DEG C；
Step 1-2: calculating the second time step, in the case where meeting on-off valve minimum make and break period restrictive condition, by controlling water flowing
Time is less than the water time swap of heat dissipation equipment, and hot water is made sufficiently to radiate in heat dissipation equipment, second time step
Calculation formula are as follows:
Tmin≤ΔT2≤T3 (2)
In formula, Δ T2For the second time step；T3For the water time swap of each heating user's branch；TminIt is logical for control valve minimum
Disconnected period limitation；
Step 1-3: the proportionate relationship of first time step-length Yu the second time step is established, is obtained:
ΔT1=n × Δ T2 (3)
In formula, n is the integer greater than 1.
3. a kind of heating terminal intelligent on-off valve regulation method based on dual time-step according to claim 1, feature
It is, the calculation formula of the duty ratio prediction model are as follows:
Di+1=Di+ΔDi+1 (4)
ΔDi+1=f3(ta,i-1,ta,i,tset,i+1) (5)
In formula, DiPeriod valve opening duty ratio is controlled for i-th of room temperature；ΔDi+1Period valve opening is controlled for i+1 to account for
The correction value of empty ratio；ta,iThe actual measurement room temperature in period is controlled for i-th of room temperature；tset,i+1Setting for period is controlled for i+1 room temperature
Determine room temperature；Function f3() indicates the pass between duty ratio correction value and history room temperature rate of change, room temperature and setting value deviation
System is established by fuzzy control table or online adaptive control learning algorithm.
4. a kind of heating terminal intelligent on-off valve regulation method based on dual time-step according to claim 1, feature
It is, the step 3 optimizes each family make-and-break time sequence, that is, meets the duty ratio predicted in step 2, random by introducing
The factor is uniformly distributed the make-and-break time sequence at each family at random, and then realizes hydraulic regime homogenization, specific optimization process are as follows:
It is n in first time step-length by the second time step number scale for including, the valve opening time of duty cycle condition will be met
Step number is denoted as m, then:
M=INT (n × Di+1)=INT (Δ T1/ΔT2×Di+1) (6)
In formula, INT indicates that logarithm carries out round；
The make-and-break time sequence for meeting duty ratio at this time has N kind arrangement mode, its calculation formula is:
It is 1,2,3 ..., N by the arrangement mode number consecutively of N kind make-and-break time sequence, foundation is uniformly distributed regular generation at random
One random integers M between 1~N is as random factor, by the make-and-break time sequence under the random integers M reference numeral
It is determined as the make-and-break time sequence of active user.
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| CN112880003A (en) * | 2021-04-01 | 2021-06-01 | 杭州中沛电子有限公司 | Central hot water supply metering method |
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