CN110486896A - A kind of tandem air-conditioning system optimal control method based on water cooler energy consumption model - Google Patents
A kind of tandem air-conditioning system optimal control method based on water cooler energy consumption model Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
Abstract
The present invention discloses a kind of tandem air-conditioning system optimal control method based on water cooler energy consumption model, includes the following steps: the related data for acquiring tandem air-conditioning refrigeration system, and estimate ice storage and the unit maximum cooling load upper limit；Energy consumption model modeling is carried out to base load water cooler in tandem air-conditioning refrigeration system and Double-working-condition water cooler using support vector regression；According to the current time ice storage of estimation, the unit maximum cooling load upper limit and workload demand, actual unit operation quantity is calculated, realizes unit team control；Base load unit, Double-working-condition unit and ice storage load are allocated, realize that parameter optimization makes the lowest coursing cost while meeting current loads and boundary condition in conjunction with unit energy consumption model；Setting optimizes update cycle, optimizing again after each end cycle.Such control method can be while meeting current loads and boundary condition, the lowest coursing cost.
Description
Technical field
The invention belongs to the optimal control for energy saving field of central air-conditioning refrigeration system, in particular to a kind of realization central air-conditioning
The control method of refrigeration system ice-melt plan, unit team control and optimization of operating parameters.
Background technique
Central air-conditioning tandem refrigeration system is usually made of base load water cooler, Double-working-condition water cooler and Ice Storage Tank,
Since plurality of operating modes can be combined into actual operation there are three kinds of cold sources, have that load adaptability is strong, regulative mode is clever
Feature living.However, operational mode excessively causes system control scheme to be difficult to choose, under identical workload demand, mould is run
Formula causes operating cost to have differences with scheme difference, and unreasonable operational mode will cause operating cost increase, or even cannot
Meet workload demand.The usual installed capacity of tandem air-conditioning refrigeration system of this complexity is larger, and operation energy consumption radix is big, has very big
The energy saving space.
In actual operation, since tandem air-conditioning refrigeration system operating condition is complicated, it is related to base load unit, Double-working-condition machine
Coordinated distributes between group, ice bank three, and conventional unit automation strategy cannot achieve system automation operation, usually by running
Personnel manually control according to previous operating experience, are only capable of ensureing load supply demand, do not play tandem air conditioner refrigerating really
System peak load shifting, energy-saving effect.
To realize tandem air-conditioning refrigeration system running optimizatin, while meeting workload demand, to base load unit, Double-working-condition
Operating load carries out coordinated allocation, unified management between unit, ice bank three, proposes a kind of based on water cooler energy consumption model
Tandem air-conditioning system optimal control method.
Summary of the invention
The purpose of the present invention is to provide a kind of tandem air-conditioning system optimal control side based on water cooler energy consumption model
Method, can be while meeting current loads and boundary condition, the lowest coursing cost.
In order to achieve the above objectives, solution of the invention is:
A kind of tandem air-conditioning system optimal control method based on water cooler energy consumption model, includes the following steps:
Step 1, temperature, flow and the ice bank ice amount data of tandem air-conditioning refrigeration system are acquired, and to ice storage and unit
The maximum cooling load upper limit is estimated；
Step 2, using support vector regression to base load water cooler in tandem air-conditioning refrigeration system and Double-working-condition cold water
Unit carry out energy consumption model modeling, input variable be chilled water inlet and outlet temperature, cooling water inlet and outlet temperature and unit load, it is defeated
It is out unit eer；
Step 3, it according to the current time ice storage of estimation, the unit maximum cooling load upper limit and workload demand, calculates
Actual unit runs quantity, realizes unit team control；
Step 4, base load unit, Double-working-condition unit and ice storage load are allocated, are realized in conjunction with unit energy consumption model
Parameter optimization makes the lowest coursing cost while meeting current loads and boundary condition；
Step 5, setting optimizes update cycle, optimizing again after each end cycle.
In above-mentioned steps 1, using weighted mean method estimate ice storage, as unit of hour, setting electricity price usually with peak when
Weighting coefficient K hourly in sectioni, then current time ice storage is estimated are as follows:
Wherein, QrFor current time ice storage, unit kW；QiceFor current time ice bank residue ice amount, unit kWh；
KnowFor current time ice-melt weighting coefficient；Now indicates current time, and end indicates that the same day finally plans the ice-melt moment.
In above-mentioned steps 1, the method for estimation water cooler power output is: the history maximum refrigeration for calculating base load water cooler is negative
Lotus Q'max_bWith the history maximum cooling load Q' of Double-working-condition water coolermax_d, then the unit maximum cooling load upper limit are as follows:
Wherein, Qmax_bFor the base load unit actual load upper limit, unit kW；ηbIt is 0 for base load unit load safety coefficient
~1 constant；Qmax_dFor the Double-working-condition unit actual load upper limit, unit kW；ηdFor Double-working-condition unit load safety coefficient, it is
0~1 constant.
In above-mentioned steps 2, when modeling to base load water cooler, input variable uses chilled water inlet/outlet temperature, cooling water
Inlet/outlet temperature and unit load export as unit eer, it may be assumed that
COP_b=f (Tei, T 'eo, Tci_b, Tco_b, Qe_b)
Wherein, COP_b is base load unit eer；TeiFor chilled water inflow temperature, unit is DEG C；Te'oGo out for chilled water
Coolant-temperature gage, unit are DEG C；Tci_bFor base load unit cold in-water temperature, unit is DEG C；Tco_bFor the water outlet of base load unit cooling water
Temperature, unit are DEG C；Qe_bFor base load unit load, unit kW；
When to the modeling of Double-working-condition unit, unification is reference with chilled water, and input quantity uses plate swap-in leaving water temperature, cooling water
Inlet and outlet temperature and unit load export as unit eer, it may be assumed that
COP_d=f (T 'eo, Teo, Tci_d, Tco_d, Qe_d)
Wherein, COP_d is Double-working-condition unit eer；T′eoFor plate swap-in coolant-temperature gage, unit is DEG C；TeoIt swaps out water for plate
Temperature, unit are DEG C；Tci_dFor Double-working-condition unit cold in-water temperature, unit is DEG C；Tco_dGo out for Double-working-condition unit cooling water
Coolant-temperature gage, unit are DEG C；Qe_dFor Double-working-condition unit load, unit kW.
In above-mentioned steps 3, when realizing unit team control, using storage-priority control, the rolling meter of base load water cooled chillers priority unlatching
Calculate control strategy.
The particular content of above-mentioned steps 3 is: Double-working-condition water cooler is run number ndIt is set as zero, it is cold to gradually increase base load
Water dispenser group runs number nbIf base load water cooler standard-sized sheet is still unsatisfactory for workload demand, increase a Double-working-condition water cooler, together
When base load unit is stepped up from zero, so circulation is until meet workload demand:
Qr+Qmax_b×nb+Qmax_d×nd> Q
Wherein, QrFor ice storage, unit kW；Qmax_bFor the base load unit load upper limit, unit kW；Qmax_dFor Double-working-condition
The unit load upper limit, unit kW；Q is actual load demand, unit kW.
In above-mentioned steps 4, parameter optimization is realized using the method for exhaustion, optimizing result is that the outlet temperature of base load water cooler is set
Definite value.
The particular content of above-mentioned steps 4 is:
Chilled water is entered plate and changes temperature T ' by set temperature material calculationeoBy step-length gradually by TeiRise to Teo, in conjunction with base
The unit eer of carrier aircraft group and Double-working-condition units consumption model pre-estimating under each temperature computation step-length, while calculating in each temperature
Spend the actual consumption under step-length；In view of unit runs the actual loading upper limit and operating load demand, practical optinal plan meets
The following conditions:
Wherein, F is chilled-water flow, unit kg/s；
Wherein, Qmax_bFor the base load unit actual load upper limit, unit kW；Qmax_dFor on Double-working-condition unit actual load
Limit, unit kW；nbNumber is run for base load water cooler；ndNumber is run for Double-working-condition water cooler；C is the specific heat capacity of water, value
For 4.2kJ/ (kg DEG C)；QrFor current time ice storage, unit kW；COP_b is base load unit eer；Tci_bFor base load
Unit cold in-water temperature, unit are DEG C；Tco_bFor base load unit cooling water leaving water temperature, unit is DEG C；COP_d is duplex
Condition unit eer；Tci_dFor Double-working-condition unit cold in-water temperature, unit is DEG C；Tco_dGo out for Double-working-condition unit cooling water
Coolant-temperature gage, unit are DEG C；
At this point, unit equipment calculates electrisity consumption N under each temperature step-lengthe' are as follows:
T ' is stepped up by step-lengtheo, finding under the premise of meeting boundary condition makes electrisity consumption Ne' the smallest T 'eo, as
Optimizing result.
After adopting the above scheme, the unit team control function of tandem air-conditioning refrigeration system may be implemented in the present invention, and to base load
Operating load carries out coordinated allocation, unified management between unit, Double-working-condition unit, ice bank three, is meeting air-conditioning system load need
While asking, realize systematic running cost with optimal.Meanwhile being optimized using the period of operating parameter, it avoids since air-conditioning system is used
System fluctuation of service caused by property.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is conventional tandem air-conditioning system structural schematic diagram in the present invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
As shown in Figure 1, the present invention provides a kind of tandem air-conditioning system optimal control side based on water cooler energy consumption model
Method includes the following steps:
Step 1, acquire tandem air-conditioning refrigeration system temperature, flow, ice bank ice amount etc. it is conventional easily adopt data, and to melting
Ice amount and water cooler power output are estimated；
The data of acquisition include: base load water cooler and Double-working-condition cooling-water machine chilled water inlet/outlet temperature, cooling water into/
Leaving water temperature, chilled-water flow, unit power consumption and ice bank ice amount.Unit output and Energy Efficiency Ratio can be calculated using acquisition data.
Had according to heat Calculation formula and unit eer calculation formula:
Wherein, Q is unit cooling load, unit kW；C is the specific heat capacity of water, and value is 4.2kJ/ (kg DEG C)；Q is
Fluid flow, unit kg/s；Δ t is chilled water supply backwater temperature difference, and unit is DEG C；COP is water cooler Energy Efficiency Ratio；NeIt is defeated
Enter power, unit kW.
The data for acquiring and being calculated in real time are subjected to historical storage, going through for base load water cooler can be calculated through statistics
History maximum cooling load Q'max_bWith the history maximum cooling load Q' of Double-working-condition water coolermax_d, then unit reality can be estimated
Upper load limit are as follows:
Wherein, Qmax_bFor the base load unit actual load upper limit, unit kW；ηbIt is 0 for base load unit load safety coefficient
~1 constant；Qmax_dFor the Double-working-condition unit actual load upper limit, unit kW；ηdFor Double-working-condition unit load safety coefficient, it is
0~1 constant.
Ice storage calculate only consider electricity price usually with the peak period, estimated using weighted mean method, as unit of hour, setting
Electricity price usually with weighting coefficient K hourly in the peak periodi, then current time ice storage is estimated are as follows:
Wherein, QrFor current time ice storage, unit kW；QiceFor current time ice bank residue ice amount, unit kWh；
KiFor electricity price usually with peak period ice-melt weighting coefficient hourly；KnowFor current time ice-melt weighting coefficient；Now expression is worked as
Preceding moment, end indicate that the same day finally plans the ice-melt moment.
Step 2, using support vector regression (SVR) to base load water cooler and duplex in tandem air-conditioning refrigeration system
Condition water cooler carries out energy consumption model modeling.
Support vector regression expression formula is as follows:
Wherein, αiFor Lagrange multiplier；For supporting vector coefficient；K(x,xi) it is kernel function, using gaussian radial basis function
Kernel function (RFB), calculating formula is as follows:
Wherein, x is input variable, xiFor supporting vector, σ is kernel function width parameter, | | ... | | it is norm calculation.
Be illustrated in figure 2 tandem air-conditioning refrigeration system structure chart, chilled water after base load water cooler temperature by TeiIt is reduced to
T′eo, then after Double-working-condition unit/ice storage plate changes, chilled water temperature is by T 'eoIt is reduced to Teo。
When to the modeling of base load water cooler, input variable uses chilled water inlet/outlet temperature, cooling water inlet/outlet temperature
And unit load, it exports as unit eer, it may be assumed that
COP_b=f (Tei, T 'eo, Tci_b, Tco_b, Qe_b)
Wherein, COP_b is base load unit eer；TeiFor chilled water inflow temperature, unit is DEG C；T′eoGo out for chilled water
Coolant-temperature gage, unit are DEG C；Tci_bFor base load unit cold in-water temperature, unit is DEG C；Tco_bFor the water outlet of base load unit cooling water
Temperature, unit are DEG C；Qe_bFor base load unit load, unit kW.
When to the modeling of Double-working-condition unit, for convenience of optimizing, unification is reference with chilled water, and input quantity uses plate swap-in
Leaving water temperature, cooling water inlet and outlet temperature and unit load export as unit eer, it may be assumed that
COP_d=f (T 'eo, Teo, Tci_d, Tco_d, Qe_d)
Wherein, COP_d is Double-working-condition unit eer；T′eoFor plate swap-in coolant-temperature gage, unit is DEG C；TeoIt swaps out water for plate
Temperature, unit are DEG C；Tci_dFor Double-working-condition unit cold in-water temperature, unit is DEG C；Tco_dGo out for Double-working-condition unit cooling water
Coolant-temperature gage, unit are DEG C；Qe_dFor Double-working-condition unit load, unit kW.
Step 3 calculates actual according to current time ice storage, the estimation of unit maximum cooling load and workload demand
Unit runs quantity.Double-working-condition water cooler is run into number ndIt is set as zero, gradually increases base load water cooler operation number nbIf
Base load water cooler standard-sized sheet is still unsatisfactory for workload demand, then increases a Double-working-condition water cooler, while by base load unit from zero
It is stepped up, so circulation is until meet workload demand:
Qr+Qmax_b×nb+Qmax_d×nd> Q
Wherein, QrFor ice storage, unit kW；Qmax_bFor the base load unit load upper limit, unit kW；Qmax_dFor Double-working-condition
The unit load upper limit, unit kW；Q is actual demand load, unit kW；nbQuantity is run for base load unit；ndFor Double-working-condition
Unit runs quantity.
Chilled water is entered plate and changes temperature T ' by step 4, set temperature material calculationeoBy step-length gradually by TeiRise to Teo,
The unit eer under each temperature computation step-length can be estimated out in conjunction with base load unit and Double-working-condition units consumption model, while can
Calculate the actual consumption under each temperature step-length.It is practical in view of unit runs the actual loading upper limit and operating load demand
Optinal plan should meet the following conditions:
Wherein, F is chilled-water flow, unit kg/s.
At this point, unit equipment calculates electrisity consumption N under each temperature step-lengthe' are as follows:
T ' is stepped up by step-lengtheo, finding under the premise of meeting boundary condition makes electrisity consumption Ne' the smallest T 'eo, as
Optimizing result.
Step 5, setting optimization update cycle, the unit operation quantity and base load machine set outlet that every suboptimization is calculated
Temperature definite value is updated by the period, non-real-time update, to prevent the frequent adjustment of control strategy.
By above series connection air-conditioning system optimal control method, can while cooling supply workload demand, to ice storage,
Unit team control, unit supply water temperature definite value optimize, and realize the lowest coursing cost, simultaneously because using fixed cycle optimizes plan
Slightly, it can effectively avoid tactful frequently adjustment, improve system run all right.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (8)
1. a kind of tandem air-conditioning system optimal control method based on water cooler energy consumption model, it is characterised in that including walking as follows
It is rapid:
Step 1, temperature, flow and the ice bank ice amount data of tandem air-conditioning refrigeration system are acquired, and maximum to ice storage and unit
The cooling load upper limit is estimated；
Step 2, using support vector regression to base load water cooler in tandem air-conditioning refrigeration system and Double-working-condition water cooler
Energy consumption model modeling is carried out, input variable is chilled water inlet and outlet temperature, cooling water inlet and outlet temperature and unit load, exports and is
Unit eer；
Step 3, it according to the current time ice storage of estimation, the unit maximum cooling load upper limit and workload demand, calculates practical
Unit run quantity, realize unit team control；
Step 4, base load unit, Double-working-condition unit and ice storage load are allocated, realize parameter in conjunction with unit energy consumption model
Optimizing makes the lowest coursing cost while meeting current loads and boundary condition；
Step 5, setting optimizes update cycle, optimizing again after each end cycle.
2. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as described in claim 1, feature
It is: in the step 1, ice storage is estimated using weighted mean method, as unit of hour, sets electricity price usually and in the peak period
Weighting coefficient K hourlyi, then current time ice storage is estimated are as follows:
Wherein, QrFor current time ice storage, unit kW；QiceFor current time ice bank residue ice amount, unit kWh；KnowFor
Current time ice-melt weighting coefficient；Now indicates current time, and end indicates that the same day finally plans the ice-melt moment.
3. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as described in claim 1, feature
Be: in the step 1, the method for estimation water cooler power output is: calculating the history maximum cooling load of base load water cooler
Q'max_bWith the history maximum cooling load Q' of Double-working-condition water coolermax_d, then the unit maximum cooling load upper limit are as follows:
Wherein, Qmax_bFor the base load unit actual load upper limit, unit kW；ηbIt is 0~1 for base load unit load safety coefficient
Constant；Qmax_dFor the Double-working-condition unit actual load upper limit, unit kW；ηdFor Double-working-condition unit load safety coefficient, be 0~
1 constant.
4. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as described in claim 1, feature
Be: in the step 2, to base load water cooler model when, input variable using chilled water inlet/outlet temperature, cooling water into/
Leaving water temperature and unit load export as unit eer, it may be assumed that
COP_b=f (Tei, T 'eo, Tci_b, Tco_b, Qe_b)
Wherein, COP_b is base load unit eer；TeiFor chilled water inflow temperature, unit is DEG C；T′eoGo out water temperature for chilled water
Degree, unit are DEG C；Tci_bFor base load unit cold in-water temperature, unit is DEG C；Tco_bGo out water temperature for base load unit cooling water
Degree, unit are DEG C；Qe_bFor base load unit load, unit kW；
When to the modeling of Double-working-condition unit, unification is reference with chilled water, and input quantity is passed in and out using plate swap-in leaving water temperature, cooling water
Coolant-temperature gage and unit load export as unit eer, it may be assumed that
COP_d=f (T 'eo, Teo, Tci_d, Tco_d, Qe_d)
Wherein, COP_d is Double-working-condition unit eer；T′eoFor plate swap-in coolant-temperature gage, unit is DEG C；TeoIt swaps out coolant-temperature gage for plate,
Unit is DEG C；Tci_dFor Double-working-condition unit cold in-water temperature, unit is DEG C；Tco_dGo out water temperature for Double-working-condition unit cooling water
Degree, unit are DEG C；Qe_dFor Double-working-condition unit load, unit kW.
5. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as described in claim 1, feature
It is: in the step 3, when realizing unit team control, using storage-priority control, the rolling calculation control of base load water cooled chillers priority unlatching
System strategy.
6. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as claimed in claim 5, feature
Be: the particular content of the step 3 is: Double-working-condition water cooler is run number ndIt is set as zero, gradually increases base load cold water
Unit runs number nbIf base load water cooler standard-sized sheet is still unsatisfactory for workload demand, increase a Double-working-condition water cooler, simultaneously
Base load unit is stepped up from zero, so circulation is until meet workload demand:
Qr+Qmax_b×nb+Qmax_d×nd> Q
Wherein, QrFor ice storage, unit kW；Qmax_bFor the base load unit load upper limit, unit kW；Qmax_dFor Double-working-condition unit
Upper load limit, unit kW；Q is actual load demand, unit kW.
7. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as described in claim 1, feature
It is: in the step 4, parameter optimization is realized using the method for exhaustion, optimizing result is that the outlet temperature of base load water cooler is set
Value.
8. the tandem air-conditioning system optimal control method based on water cooler energy consumption model as claimed in claim 7, feature
Be: the particular content of the step 4 is:
Chilled water is entered plate and changes temperature T ' by set temperature material calculationeoBy step-length gradually by TeiRise to Teo, in conjunction with base load machine
Group and unit eer of the Double-working-condition units consumption model pre-estimating under each temperature computation step-length, while calculating in each temperature step
Actual consumption under long；In view of unit runs the actual loading upper limit and operating load demand, practical optinal plan meets following
Condition:
Wherein, F is chilled-water flow, unit kg/s；
Wherein, Qmax_bFor the base load unit actual load upper limit, unit kW；Qmax_dIt is single for the Double-working-condition unit actual load upper limit
Position is kW；nbNumber is run for base load water cooler；ndNumber is run for Double-working-condition water cooler；C is the specific heat capacity of water, and value is
4.2kJ/(kg·℃)；QrFor current time ice storage, unit kW；COP_b is base load unit eer；Tci_bFor base load machine
Group cold in-water temperature, unit are DEG C；Tco_bFor base load unit cooling water leaving water temperature, unit is DEG C；COP_d is Double-working-condition
Unit eer；Tci_dFor Double-working-condition unit cold in-water temperature, unit is DEG C；Tco_dFor the water outlet of Double-working-condition unit cooling water
Temperature, unit are DEG C；
At this point, unit equipment calculates electrisity consumption N under each temperature step-lengthe' are as follows:
T ' is stepped up by step-lengtheo, finding under the premise of meeting boundary condition makes electrisity consumption N 'eThe smallest T 'eo, as optimizing
As a result.
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| CN111442489B (en) * | 2020-03-27 | 2021-12-14 | 上海美控智慧建筑有限公司 | Control method and system of air conditioner, air conditioner and readable storage medium |
| CN112032882A (en) * | 2020-08-07 | 2020-12-04 | 南京南瑞继保电气有限公司 | Scheduling method of ice storage air conditioning system |
| CN113739365A (en) * | 2021-08-31 | 2021-12-03 | 广州汇电云联互联网科技有限公司 | Central air-conditioning cold station group control energy-saving control method, device, equipment and storage medium |
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