Central air conditioner room control method under energy consumption limitTechnical field
The present invention relates to the central air conditioner room control methods under a kind of energy consumption limit, belong to Air-condition system control technology neckDomain.
Background technique
With the development of Chinese Urbanization and process of industrialization, the scale and quantity of public building and industrial building constantly increaseAdd, building energy consumption constantly rises.And central air-conditioning is the energy consumption rich and influential family in building, generally occupies the 40%~60% of buildingEnergy consumption.When power supply capacity is unable to satisfy power demand, if building central air conditioner system can control energy consumption in limit modelIn enclosing, and meet comfort level requirement as far as possible, then on the one hand can mitigate power grid power supply pressure, on the one hand reduce and building is transportedCapable influence guarantees the orderly progress of economic activity.
The method for solving energy consumption limit at present is that implementation plan has a power failure, and in specific time period, closes building central air conditioner system,To complete energy consumption limit plan.But scheduled outage generally require in advance a couple of days according to power grid power supply capacity and power demand intoA possibility that rigidity power failure plan is formulated in row prediction, and there are excessive power failures；Secondly, building central air-conditioning system during scheduled outageSystem completely closes, and building function is a greater impact.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, the center under a kind of energy consumption limit is providedAir Conditioning Facilities control method, building central air conditioner system dynamically adjust operating status according to the power supply capacity of power grid, meet electricityWhile net demand, the influence to building function is reduced most possibly.
In order to solve the above technical problems, the present invention provides the central air conditioner room control method under a kind of energy consumption limit, packetInclude following steps:
1) the energy consumption limit of special time period, energy consumption limit letter are set by data communication interface or personnel's input modeBreath includes energy consumption limit time started Tst, energy consumption limit dwell time Tend, maximal input Nlmt, maximum electricity consumption Plmt；
2) it is pre- to being carried out in energy consumption clipping time section according to energy consumption limit operating status first after system receives energy consumption limitIt surveys, and exports energy consumption limit response；
3) enter energy consumption limit state, from pretreatment time TpreStart to energy consumption limit time started TstIn time, buildingInto cold-storage state or maintain state；The pretreatment time TpreAccording to the water outlet of the load side of central air conditioner system according to beingThe minimum flow rate of system operation is recycled to the time of farthest end to determine；
4) by the energy consumption limit time started T of settingstCompared with the real time, enter after reaching the energy consumption limit time startedEnergy consumption limit state, not up to energy consumption limit time started then repeat step 3), continue cold-storage；
5) it is brought into operation by the energy consumption limit time started, can currently be distributed according to the prediction data calculating in the step 2)General power；
6) power level is calculated according to the actual parameter of equipment and load rate of plant, power level is divided into three-level, power stageOther 1 is Nset1, power level 2 is Nset2, power level 3 is Nset3；
7) the current distribute general power N obtained by step 4)all(t0) the value N of power level 1 that obtains with step 6)set1It makes comparisons, if Nall(t0) it is greater than Nset1, then cooling water pump, cooling tower are run according to non-energy consumption limit state, dump power pointDispensing chilled water pump and unit, chilled water pump and unit are according to rate of load condensate η1Operation；Then it is transferred to step 10)；Otherwise it is transferred to stepIt is rapid 8)；
8) the current distribute general power N obtained by step 4)all(t0) the value N of power level 2 that obtains with step 6)set2It makes comparisons, if Nall(t0) it is less than Nset1And it is greater than Nset2, then cooling water pump, chilled water pump, cooling tower and unit are according to loadRate η2Operation；Then it is transferred to step 10)；Otherwise it is transferred to step 9)；
9) the current distribute general power N obtained by step 4)all(t0) the value N of power level 3 that obtains with step 6)set3It makes comparisons, if Nall(t0) it is less than Nset2And it is greater than Nset3, then stop cooling water pump, cooling tower and unit operation, chilled water pumpIt is run according to minimum load rate；If Nall(t0) it is less than Nset3, then stop cooling water pump, cooling tower, chilled water pump and unit fortuneRow；Then it is transferred to step 10)；
10) by the energy consumption limit dwell time T of settingendCompared with the real time, it is laggard to reach energy consumption limit dwell timeEnter non-energy consumption limit normal operating condition, not up to energy consumption limit dwell time then return step 5), until reaching energy consumption limitDwell time restores normal operating condition.
In aforementioned step 2), using prediction algorithm neural network based, according to historical data and current data, predictionElectricity consumption P of the central air conditioner system in energy consumption clipping time section normal operation outf, system real-time load Qf(t) and systemIn the general refrigeration ability C of energy consumption clipping time section normal needf, compare PfAnd Ps, work as PfGreater than PsWhen, then energy consumption limit response is exported,It enters step 3)；Work as PfLess than PsWhen, then energy consumption limit response is not exported, and system is operated normally according to non-power consumption state, PsFor realityBorder residue available power.
Energy consumption limit response above-mentioned is real surplus available power PsWith central air conditioner system in energy consumption clipping time sectionThe electricity consumption P of normal operationf。
In aforementioned step 3), cold-storage state is entered according to chilled water temperature and the judgement of indoor temperature and humidity data and is either tieed upState is held, system makes to export cooling capacity slightly larger than system loading by controlling central air-conditioning leaving water temperature, and building enters cold-storage state；When central air conditioning water temperature reaches system design lower bound, and indoor temperature and humidity reaches comfort level tolerance lower bound, system is logicalCrossing control central air-conditioning leaving water temperature makes to export cooling capacity and system loading balance, and building enters maintenance state.
In aforementioned step 5), current assignable general power Nall(t0) are as follows:
Nall(t0)=KQf(t0)
Wherein, t0For current time, Qf(t0) it is current system real-time load,
In aforementioned step 6), the calculation method of power level are as follows:
If η is load rate of plant, range is 0~1, wherein η=0 indicates equipment work in minimum load, and the expression of η=1 is setIt is standby to work in non-energy consumption limit state,
The relationship of load rate of plant and equipment operation power can be obtained according to facility information: unit load rate and unit are runPower relation is Nch(η), chilled water pump rate of load condensate and chilled water pump operation power relation are Nchwp(η), cooling water pump rate of load condensateIt is N with cooling water pump operation power relationcwp(η), cooling tower load rate and cooling tower operation power relation are Nct(η)；
Power level calculating formula are as follows:
Power level 1:Nset1=Ncwp(1)+Nct(1)+Nchwp(0)+Nch(0)；
Power level 2:Nset2=Ncwp(0)+Nct(0)+Nchwp(0)+Nch(0)；
Power level 3:Nset3=Nchwp(0)。
In aforementioned step 7), η1Meet: Nch(η1)+Nchwp(η1)=Nall(t0)-Ncwp(1)-Nct(1)。
In aforementioned step 8), η2Meet: Nch(η2)+Nchwp(η2)+Ncwp(η2)+Nct(η2)=Nall(t0)。
Advantageous effects of the invention:
The present invention can make to build the control of central air conditioner system energy consumption in quota limit, dynamically adjust operating status,And meet comfort level requirement as far as possible, it on the one hand can mitigate power grid power supply pressure, on the one hand reduce the influence to constructing operation,Guarantee the orderly progress of economic activity.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the inventionCase, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, the central air conditioner room control method under energy consumption limit of the invention, comprising the following steps:
1) the energy consumption limit of special time period, energy consumption limit letter are set by data communication interface or personnel's input modeBreath includes energy consumption limit time started Tst, energy consumption limit dwell time Tend, maximal input Nlmt, maximum electricity consumption Plmt。
2) after system receives energy consumption limit, first to section (the energy consumption limit time started to energy consumption limit energy consumption clipping timeDwell time) in predicted according to energy consumption limit operating status, and export energy consumption limit response.
Prediction algorithm neural network based is utilized in prediction algorithm, according to historical data and current data, predictsEntreat air-conditioning system in the electricity consumption P of energy consumption clipping time section normal operationf, system real-time load Qf(t) and system is in energyConsume the general refrigeration ability C of clipping time section normal needf, compare PfAnd Ps, work as PfGreater than PsWhen, then energy consumption limit response is exported, is enteredStep 3)；Work as PfLess than PsWhen, then energy consumption limit response is not exported, and system is operated normally according to non-power consumption state, PsIt is practical surplusRemaining available power.
Energy consumption limit response is real surplus available power PsWith the electricity consumption P of forecasting system normal operationf。
3) enter energy consumption limit state, from pretreatment time TpreStart to energy consumption limit time started TstIn time, buildingInto cold-storage state or maintain state；Pretreatment time TpreIt is discharged according to the load side of central air conditioner system and is transported according to systemCapable minimum flow rate is recycled to the time of farthest end to determine, is entered according to chilled water temperature and the judgement of indoor temperature and humidity dataCold-storage state either maintains state, and system makes output cooling capacity be slightly larger than system loading by controlling central air-conditioning leaving water temperature,Building enters cold-storage state；Lower bound is designed when central air conditioning water temperature reaches system, and indoor temperature and humidity reaches comfort levelWhen tolerating lower bound, system makes to export cooling capacity and system loading balance by controlling central air-conditioning leaving water temperature, and building, which enters, to be maintainedState.
4) by the energy consumption limit time started T of settingstCompared with the real time, enter after reaching the energy consumption limit time startedEnergy consumption limit state, not up to energy consumption limit time started then repeat step 3), continue cold-storage.
5) it is brought into operation, is calculated according to the prediction data in step 2) current assignable total by the energy consumption limit time startedPower Nall, based on assuming that load curve and computational constant K, load curve and energy consumption curve under energy consumption curve unanimous circumstancesUnder unanimous circumstances, constant K is fixed value, realtime power Nf(t), pass through the system real-time load Q of constant K and predictionf(t)Calculate current assignable total power input Nall, calculation are as follows:
Assuming that load curve is consistent with energy consumption curve, then exist:
Nf(t)=KQf(t)
K is constant, according to this formula to calculating,
∫Nf(t) dt=∫ KQf(t)dt
Cause are as follows:
Pf=∫ Nf(t)dt
Cf=∫ Qf(t)dt
So:
Pf=KCf
It obtains:
According to the system real-time load Q of predictionf(t) current time t is calculated0Assignable total power input Nall(t0):
Nall(t0)=KQf(t0)。
6) power level is calculated according to the actual parameter of equipment and load rate of plant,
If η is load rate of plant, range is 0~1, wherein η=0 indicates equipment work in minimum load, and the expression of η=1 is setStandby work is in non-energy consumption limit state.
The relationship of load rate of plant and equipment operation power can be obtained according to facility information: unit load rate and unit are runPower relation is Nch(η), chilled water pump rate of load condensate and chilled water pump operation power relation are Nchwp(η), cooling water pump rate of load condensateIt is N with cooling water pump operation power relationcwp(η), cooling tower load rate and cooling tower operation power relation are Nct(η)；
Power level calculates, and according to the actual parameter calculated load rate of equipment, meets the normal operation of system, power levelCalculation are as follows:
Power level 1:Nset1=Ncwp(1)+Nct(1)+Nchwp(0)+Nch(0)；
Power level 2:Nset2=Ncwp(0)+Nct(0)+Nchwp(0)+Nch(0)；
Power level 3:Nset3=Nchwp(0)。
7) the current distribute general power N obtained by step 4)all(t0) the value N of power level 1 that obtains with step 6)set1It makes comparisons, if Nall(t0) it is greater than Nset1, then cooling water pump, cooling tower are run according to non-energy consumption limit state, dump power pointDispensing chilled water pump and unit, chilled water pump and unit are according to rate of load condensate η1Operation；η1Meet: Nch(η1)+Nchwp(η1)=Nall(t0)-Ncwp(1)-Nct(1), dump power, that is, Nall(t0)-Ncwp(1)-Nct(1)。
8) the current distribute general power N obtained by step 4)all(t0) the value N of power level 2 that obtains with step 6)set2It makes comparisons, if Nall(t0) it is less than Nset1And it is greater than Nset2, then cooling water pump, chilled water pump, cooling tower and unit are according to loadRate η2Operation；η2Meet: Nch(η2)+Nchwp(η2)+Ncwp(η2)+Nct(η2)=Nall(t0)。
9) the current distribute general power N obtained by step 4)all(t0) the value N of power level 3 that obtains with step 6)set3It makes comparisons, if Nall(t0) it is less than Nset2And it is greater than Nset3, then stop cooling water pump, cooling tower and unit operation, chilled water pumpIt is run according to minimum load rate；If Nall(t0) it is less than Nset3, then stop cooling water pump, cooling tower, chilled water pump and unit fortuneRow.Chilled water pump minimum load is Nchwp(0)。
10) by the energy consumption limit dwell time T of settingendCompared with the real time, it is laggard to reach energy consumption limit dwell timeEnter non-energy consumption limit normal operating condition, not up to energy consumption limit dwell time then return step 5), until reaching energy consumption limitDwell time restores normal operating condition.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the artFor member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformationsAlso it should be regarded as protection scope of the present invention.