CN102135311B - Air conditioning system integral optimized control device - Google Patents
Air conditioning system integral optimized control device Download PDFInfo
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Abstract
The invention provides an air conditioning system integral optimized control device. The device comprises a host (101), a weak current control system (102), and a strong current control system (103), wherein both the weak current control system (102) and the strong current control system (103) are connected in parallel with the host (101) via an RS485 communication interface. The control device provided by the invention realizes the control completely compatible and parallel with an original central air conditioning control circuit, and has a local control mode and a remote control mode, wherein the local mode is applicable to site button operation, and the remote mode is applicable to remote computer remote control operation. The remote mode is divided into an automatic mode and a manual mode, wherein the manual mode can realize remote inching equipment operation, and the automatic mode can realize the full-automatic, failure-free and optimized operation of the central air conditioning system.
Description
Technical field
The present invention relates to the central air-conditioning energy technical field, be specifically related to a kind of Integral optimization control device of central air-conditioning system.
Background technology
The ineffective energy consumption of Large Central Air Conditioning System system ubiquity more than 30%, in actual motion, the time that the air-conditioning system peak load of whole year operation occurs generally is no more than 10% of total run time, because the selection of air-conditioning equipment is determined according to design conditions, and the air-conditioning system most of the time works under lower than 80% rate of load condensate.The energy-conservation attention that more and more obtains people of central air conditioner system.
In the central air-conditioning energy technology, the technology such as pump variable frequency technology, chilled water system fuzzy control technology, nerual network technique that comprise have been prevalent in various central air-conditioning technical innovation projects, and have obtained certain energy-saving effect at present.
But the problem that these technology exist is overemphasized the weight of automatic control technology, ignores the complexity of air-conditioning system and non-linear, focuses on that just the transformation of certain equipment in central air conditioner system or local mini system is energy-conservation, the overall situation is not considered.
Air-conditioning system is an integral body that is comprised of a plurality of device clusters, the frequency conversion of cooling water pump must cause the variation of handpiece Water Chilling Units and cooling tower cooling water outlet temperature, and then have influence on the operational efficiency of cooling tower and handpiece Water Chilling Units, it is independent use frequency converter and there is no the words of the strategy of overall control, even cooling water pump has energy-saving effect, but because of handpiece Water Chilling Units and the not corresponding control of cooling tower, cause the energy consumption of system to increase on the contrary.Chilled water pump frequency conversion simultaneously also must cause handpiece Water Chilling Units chilled water leaving water temperature, the two-port valve aperture of terminal temperature difference, the variation of bypass pipe flow is independent use frequency converter and lack the strategy of overall control, certainly will affect the operational efficiency of handpiece Water Chilling Units and the comfortableness of terminal temperature difference.
Pump variable frequency is generally temperature difference differential pressure and controls.Simple VFC take the temperature difference as feedback signal if temperature difference setting is too small, must cause the frequent movement of frequency converter, causes the vibration of whole air-conditioning system; If it is excessive that the temperature difference is set, can reduce system to the susceptibility of load variations, cause the VFC response lag.And simple VFC take pressure as feedback signal, because pressure signal changes soon, must cause the variation of end valve during pump variable frequency simultaneously, and then cause the variation of system pressure, the frequent movement that finally causes frequency converter causes the vibration of whole air-conditioning system.If therefore the selection of the control strategy of pump variable frequency is improper, must affect the stability of whole system operation, cause the reduction of running efficiency of system, thereby increase system energy consumption, balance out the energy-saving effect that pump variable frequency brings.
So developing operation is stable, energy-conservation, Integral optimization control device of central air-conditioning system that cost is relatively low is necessary.
Summary of the invention
In central air conditioner system, in order to realize Systems balanth operation and maximum energy-saving effect, a kind of Integral optimization control device of central air-conditioning system has been proposed, the present invention and former central air-conditioning control circuit be compatibility and parallel control mutually fully.Control model is divided into local control model and distance control mode, wherein local mode is applicable to on-the-spot push-botton operation, distance control mode is suitable for the far-end computer straighforward operation, can be divided into automatic mode and manual mode, but far-end crawl equipment operating under manual mode, automatic mode can realize that central air conditioner system is full-automatic, fault-free, optimization operation, and function comprises: handpiece Water Chilling Units controls, water supply pump VFC, coolant pump VFC, cooling tower are controlled and electrically operated valve interlock control; Equipment running priority level arranges, minute manually setting, the random setting and the sequential setting, reasonable distribution operation hours; The operation of air conditioner period arranges, and can divide 8 time periods and time period at weekend; The equipment operational factor arranges, and according to the air-conditioning equipment characteristic, the operational factor of each equipment is set rationally; Historical trend, energy consumption compare and print form.
A kind of Integral optimization control device of central air-conditioning system, described device comprise host computer, light-current system, heavy-current control system, and wherein light-current system and heavy-current control system all are connected in parallel to host computer by the RS485 communication interface.
In above-mentioned Integral optimization control device of central air-conditioning system, light-current system comprises water chilling unit control system, refrigerating water pump set control system, coolant pump set control system, cooling tower set control system, motor-driven valve set control system, and wherein water chilling unit control system, refrigerating water pump set control system, coolant pump set control system, cooling tower set control system, motor-driven valve set control system all are connected in parallel to host computer by the RS485 communication interface.
in above-mentioned Integral optimization control device of central air-conditioning system, being a kind of unit team control and changing with air conditioner load and dynamically adjust the control model that the cold water leaving water temperature combines of the realization of water chilling unit control system, water chilling unit control system comprises Temperature Humidity Sensor, the first sets of temperature sensors, the first analog input module group, the first electrical quantity sensor group, the first AC intermediate relay group, the first digital quantity input module group, the first direct current auxiliary reclay group and the first digital output module group, the first sets of temperature sensors wherein, Temperature Humidity Sensor, the first electrical quantity sensor group is connected in parallel to the first analog input module group through Shielded Twisted Pair, the first AC intermediate relay group is connected to the first digital quantity input module group through the 220VAC cable, the first direct current auxiliary reclay group is connected to the first digital output module group through the 24VDC cable, the first analog input module group, the first digital quantity input module group, the first digital output module group is connected in parallel to host computer through the RS485 communication interface.
in above-mentioned Integral optimization control device of central air-conditioning system, what described refrigerating water pump set control system was realized is the control model that a kind of " one becomes how fixed " frequency conversion or whole conversion system combine with the control of pump cohort, and control signal comprises freezing for the backwater main temperature difference, freezing for backwater main pressure reduction, air-conditioning load rate, described refrigerating water pump set control system comprises first flow sensor group, the second sets of temperature sensors, the second analog input module group, the first differential pressure pick-up, the second electrical quantity sensor group, the second AC intermediate relay group, the second digital quantity input module group, the second direct current auxiliary reclay group and the second digital output module group, wherein first flow sensor group, the second sets of temperature sensors, the first differential pressure pick-up, the second electrical quantity sensor group is connected in parallel to the second analog input module group through Shielded Twisted Pair, the second AC intermediate relay group is connected to the second digital quantity input module group through the 220VAC cable, and the second direct current auxiliary reclay group is connected to the second digital output module group through the 24VDC cable, the second analog input module group, the second digital quantity input module group, the second digital output module group are connected in parallel to host computer through the RS485 communication interface.
in above-mentioned Integral optimization control device of central air-conditioning system, what described coolant pump set control system was realized is the control model that a kind of " one becomes how fixed " frequency conversion or whole conversion system combine with the control of pump cohort, and control signal comprises cooling for the backwater main temperature difference, cooling for backwater main pressure reduction, described coolant pump set control system comprises the 3rd direct current auxiliary reclay group, the 3rd digital output module group, the 3rd AC intermediate relay group, the 3rd digital quantity input module group, the 3rd electrical quantity sensor group, the three-temperature sensor group, the 3rd analog input module group, the second differential pressure pick-up and second quantity sensor, wherein the 3rd electrical quantity sensor group, the three-temperature sensor group, the second differential pressure pick-up, the second quantity sensor is connected in parallel to the 3rd analog input module group through Shielded Twisted Pair, the 3rd AC intermediate relay group is connected to the 3rd digital quantity input module group through the 220VAC cable, the 3rd direct current auxiliary reclay group is connected to the 3rd digital output module group through the 24VDC cable, the 3rd analog input module group, the 3rd digital quantity input module group, the 3rd digital output module group is connected in parallel to host computer through the RS485 communication interface.
In above-mentioned Integral optimization control device of central air-conditioning system, described cooling tower set control system is a kind of number of units team control, and control signal comprises cooling tower group leaving water temperature.described cooling tower set control system comprises the 4th direct current auxiliary reclay group, the 4th digital output module group the 4th AC intermediate relay group, the 4th digital quantity input module group, the 4th electrical quantity sensor group and the 4th analog input module group, wherein the 4th electrical quantity sensor group is connected in parallel to the 4th analog input module group through Shielded Twisted Pair, the 4th AC intermediate relay group is connected to the 4th digital quantity input module group through the 220VAC cable, the 4th direct current auxiliary reclay group is connected to the 4th digital output module group through the 24VAC cable, the 4th analog input module group, the 4th digital quantity input module group, the 4th digital output module group is connected in parallel to host computer through the RS485 communication interface.
In above-mentioned Integral optimization control device of central air-conditioning system, described motor-driven valve set control system is the interlock control model.Described motor-driven valve set control system comprises the 5th AC intermediate relay group, the 5th digital quantity input module group, the 5th direct current auxiliary reclay group and the 5th digital output module group, wherein the 5th AC intermediate relay group is connected to the 5th digital quantity input module group through the 220VAC cable, the 5th direct current auxiliary reclay group is connected to the 5th digital output module group through the 24VAC cable, and the 5th digital quantity input module group, the 5th digital output module group are connected in parallel to host computer through the RS485 communication interface.
In above-mentioned Integral optimization control device of central air-conditioning system, described heavy-current control system comprises refrigerating water pump group frequency-changing control system and coolant pump group frequency-changing control system, and wherein refrigerating water pump group frequency-changing control system, coolant pump group frequency-changing control system are connected in parallel to host computer through the RS485 communication interface.
In above-mentioned Integral optimization control device of central air-conditioning system, described refrigerating water pump group frequency-changing control system comprises the first pre-filter, the first frequency converter, the first postfilter, the first A.C. contactor group and the first differential temperature controller, wherein the first pre-filter, the first frequency converter, the first postfilter, the first A.C. contactor group are connected in series through threephase cable, the first frequency converter, the first differential temperature controller are connected in series through Shielded Twisted Pair, and the first frequency converter, the first differential temperature controller are connected in parallel to host computer through the RS485 communication interface; Described coolant pump group frequency-changing control system comprises the second A.C. contactor group, the second postfilter, the second frequency converter, the second differential temperature controller and the second pre-filter, wherein the second A.C. contactor group, the second postfilter, the second frequency converter, the second pre-filter are connected in series through threephase cable, the second frequency converter, the second differential temperature controller are connected in series through Shielded Twisted Pair, and the second frequency converter, the second differential temperature controller are connected in parallel to host computer through the RS485 communication interface.
Operation principle of the present invention: handpiece Water Chilling Units has a rate of load condensate scope that efficient is higher, by computer to the team control of handpiece Water Chilling Units length of run, in time adjust the rate of load condensate distribution situation of handpiece Water Chilling Units, make each handpiece Water Chilling Units be in the optimum efficiency running status, energy efficient, the operating cost that reduces; In order to guarantee the handpiece Water Chilling Units safe operation, chilled water and cooling water there is a lower limit flow restriction simultaneously; , handpiece Water Chilling Units low when rate of load condensate starts number of units when many, in order to guarantee the safety of handpiece Water Chilling Units, the freezing water yield and cooling water inflow are all larger, this moment is by the length of run team control to handpiece Water Chilling Units, reduce the startup number of units of handpiece Water Chilling Units, can effectively reduce the water demand of chilled water pump and cooling water pump, reduce pump energy consumption; The motor-driven valve of the freezing and cooling water channel of every handpiece Water Chilling Units should be followed the startup of cold water and start, stops and stopping.If handpiece Water Chilling Units is out of service, and its freezing and motor-driven valve cooling water channel does not cut out, and will cause the bypass of a large amount of chilled waters of handpiece Water Chilling Units side and cooling water, has increased the ineffective energy consumption of water pump.Control by the length of run to dynamoelectric water valve, can effectively stop this part ineffective energy consumption.
With the chilled water system 401 of by-passing valve, when minimum, the energy-conservation maximum of team control mode energy consumption of air conditioner cold water traffic demand 1 pump frequency conversion during lower than 1 water pump metered flow; The air conditioner water traffic demand between between 1 and 2 water pump metered flows the time, minimum, the energy-conservation maximum of team control mode energy consumption of 2 pump variable frequencies; The air conditioner water traffic demand between between 2 and 3 water pump metered flows the time, minimum, the energy-conservation maximum of team control mode energy consumption of 3 pump variable frequencies; The air conditioner water traffic demand between between 3 and 4 water pump metered flows the time, minimum, the energy-conservation maximum of team control mode energy consumption of 4 pump variable frequencies; Along with the increase of bypass pressure reduction setting value, the energy consumption gap during High Load Rate between 4 kinds of pump variable frequency team control modes reduces." changeable how fixed " conversion system can't cause the acute variation of main frequency water pump energy consumption simultaneously.Therefore, the VFC of chilled water pump should distribute according to air-conditioning load rate, duration of load application different frequency conversion distributed areas is set, and the operation number of units of reasonable arrangement variable frequency pump reduces pump energy consumption to greatest extent, saves operating cost.
Compared with prior art, the invention has the beneficial effects as follows: described a kind of Integral optimization control device of central air-conditioning system is workable, can realize the switching of local control and Long-distance Control, remote control operation is flexible, manual and automatic two kinds of operational modes are arranged, coordinate constantly the operational factor of each equipment of central air-conditioning under the remote auto control model, seek optimum controling strategy, the optimum control of realization to each equipment of central air-conditioning guarantees central air conditioner system Operation safety, stability and energy saving.By the long-distance intelligent control to handpiece Water Chilling Units, the rate of load condensate of in time adjusting handpiece Water Chilling Units distributes, and makes each handpiece Water Chilling Units be in the optimum efficiency running status, energy efficient, the operating cost that reduces; Reduce the startup number of units of handpiece Water Chilling Units, can effectively reduce the water demand of chilled water pump and cooling water pump, reduce pump energy consumption to main frame automatic record running time, realize the concentrated team control of multicomputer; Optimum chilled water leaving water temperature calculation and control; Adopt the operational effect of a pump variable frequency and Duo Tai power frequency combined running mode than the small investment that all adopts conversion system, stable.The frequency conversion of cooling water pump realizes the step-less adjustment of cooling water inflow, coordinates the number of units of cooling tower to control, and can guarantee the energy-saving effect of cooling water system 403, also can guarantee the Systems balanth operation, can also effectively reduce initial cost; To the service data storage, provide the inquiry of historical data and trend to show and printing reports.
Description of drawings
Fig. 1 is the monitoring structure figure of a kind of Integral optimization control device of central air-conditioning system of the present invention.
Fig. 2 is the structure chart of light-current system of the present invention.
Fig. 3 is the structure chart of heavy-current control of the present invention system.
Fig. 4 is the central air conditioning equipment structure chart.
Fig. 5 is the connection layout of Integral optimization control device of central air-conditioning system central air conditioning equipment of the present invention.
Fig. 6 is the building-block of logic of control system of the present invention.
Fig. 7 is the frequency conversion effect comparison diagram of variable-flow chilled water system under 80kPa setting pressure reduction with by-passing valve.
Fig. 8 is the frequency conversion effect comparison diagram of variable-flow chilled water system under 128kPa setting pressure reduction with by-passing valve.
Fig. 9 is the frequency conversion effect comparison diagram of variable-flow chilled water system under 170kPa setting pressure reduction with by-passing valve.
Power comparison diagram when Figure 10 is many power frequency operations of water pump separate unit frequency conversion.
The specific embodiment
Below in conjunction with accompanying drawing, enforcement of the present invention is described further, but enforcement of the present invention and protection domain are not limited to this.
Characteristics of the present invention are that control system has been dissolved in the thoughts such as central air conditioner system operation characteristic physical mathematics model, artificial intelligence and practical operating experiences correction, by computer workstation background program real time execution physical mathematics model automatic optimal, to obtain optimum air-conditioning system operating condition under the conditions such as different load, different chamber's external environment, according to field adjustable result and practical operating experiences, result of calculation is revised to improve precise control, artificial intelligence plays key effect in the load prediction of air conditioning area and control system optimizing are found the solution.
As Fig. 4, the central air conditioning equipment described in Integral optimization control device of central air-conditioning system comprises chilled water system 401, handpiece Water Chilling Units 402 and cooling water system 403.Chilled water system 401 is made of for return pipe, chilled water motor-driven valve 512, bypass regulating system 511 and refrigerating water pump group 513 chilled water.Cooling water system 403 is made of for return pipe, cooling water motor-driven valve 402, electronic 516 valves of cooling tower water inlet, cooling tower water outlet motor-driven valve 517, cooling tower group 519 and coolant pump group 514 cooling water.
As Fig. 1, a kind of Integral optimization control device of central air-conditioning system comprises host computer 101, light-current system 102, heavy-current control system 103, and wherein light-current system 102 and heavy-current control system 103 all are connected in parallel to 101 by the RS485 communication interface.
As Fig. 2, light-current system 102 comprises water chilling unit control system 201, refrigerating water pump set control system 202, coolant pump set control system 203, cooling tower set control system 204, motor-driven valve set control system 205, and wherein water chilling unit control system 201, refrigerating water pump set control system 202, coolant pump set control system 203, cooling tower set control system 204, motor-driven valve set control system 205 all are connected in parallel to host computer 101 by the RS485 communication interface.
as shown in Figure 5, water chilling unit control system 201 comprises Temperature Humidity Sensor 528, the first sets of temperature sensors 529, the first analog input module group 530, the first electrical quantity sensor group 531, the first AC intermediate relay group 532, the first digital quantity input module group 533, the first direct current auxiliary reclay group 534 and the first digital output module group 535, the first sets of temperature sensors 529 wherein, Temperature Humidity Sensor 528, the first electrical quantity sensor group 531 is connected in parallel to the first analog input module group 530 through Shielded Twisted Pair, the first AC intermediate relay group 532 is connected to the first digital quantity input module group 533 through the 220VAC cable, the first direct current auxiliary reclay group 534 is connected to the first digital output module group 535 through the 24VDC cable, the first analog input module group 530, the first digital quantity input module group 533, the first digital output module group 535 is connected in parallel to host computer 101 through the RS485 communication interface.described refrigerating water pump set control system 202 comprises first flow sensor group 519, the second sets of temperature sensors 520, the second analog input module group 521, the first differential pressure pick-up 522, the second electrical quantity sensor group 523, the second AC intermediate relay group 524, the second digital quantity input module group 525, the second direct current auxiliary reclay group 526 and the second digital output module group 527, first flow sensor group 519 wherein, the second sets of temperature sensors 520, the first differential pressure pick-up 522, the second electrical quantity sensor group 523 is connected in parallel to the second analog input module group 521 through Shielded Twisted Pair, the second AC intermediate relay group 524 is connected to the second digital quantity input module group 525 through the 220VAC cable, the second direct current auxiliary reclay group 526 is connected to the second digital output module group 527 through the 24VDC cable, the second analog input module group 521, the second digital quantity input module group 525, the second digital output module group 527 are connected in parallel to host computer 101 through the RS485 communication interface.described coolant pump set control system 203 comprises the 3rd direct current auxiliary reclay group 536, the 3rd digital output module group 537, the 3rd AC intermediate relay group 538, the 3rd digital quantity input module group 539, the 3rd electrical quantity sensor group 540, three-temperature sensor group 541, the 3rd analog input module group 542, the second differential pressure pick-up 543 and second quantity sensor 544, wherein the 3rd electrical quantity sensor group 540, three-temperature sensor group 541, the second differential pressure pick-up 543, second quantity sensor 544 is connected in parallel to the 3rd analog input module group 542 through Shielded Twisted Pair, the 3rd AC intermediate relay group 538 is connected to the 3rd digital quantity input module group 539 through the 220VAC cable, the 3rd direct current auxiliary reclay group 536 is connected to the 3rd digital output module group 537, the three analog input module groups 542 through the 24VDC cable, the 3rd digital quantity input module group 539, the 3rd digital output module group 537 is connected in parallel to host computer 101 through the RS485 communication interface.described cooling tower set control system 204 comprises the 4th direct current auxiliary reclay group 545, the 4th digital output module group 546 the 4th AC intermediate relay group 547, the 4th digital quantity input module group 548, the 4th electrical quantity sensor group 549 and the 4th analog input module group 550, wherein the 4th electrical quantity sensor group 549 is connected in parallel to the 4th analog input module group 550 through Shielded Twisted Pair, the 4th AC intermediate relay group 547 is connected to the 4th digital quantity input module group 548 through the 220VAC cable, the 4th direct current auxiliary reclay group 545 is connected to the 4th digital output module group 546 through the 24VAC cable, the 4th analog input module group 550, the 4th digital quantity input module group 548, the 4th digital output module group 546 is connected in parallel to host computer 101 through the RS485 communication interface.described motor-driven valve set control system 205 comprises the 5th AC intermediate relay group 553, the 5th digital quantity input module group 554, the 5th direct current auxiliary reclay group 551 and the 5th digital output module group 552, wherein the 5th AC intermediate relay group 553 is connected to the 5th digital quantity input module group 554 through the 220VAC cable, the 5th direct current auxiliary reclay group 551 is connected to the 5th digital output module group 552 through the 24VAC cable, the 5th digital quantity input module group 554, the 5th digital output module group 552 is connected in parallel to host computer 101 through the RS485 communication interface.
As Fig. 3, described heavy-current control system 103 comprises refrigerating water pump group frequency-changing control system 301 and coolant pump group frequency-changing control system 302, and wherein refrigerating water pump group frequency-changing control system 301, coolant pump group frequency-changing control system 302 are connected in parallel to host computer 101 through the RS485 communication interface.As Fig. 5, described refrigerating water pump group frequency-changing control system 301 comprises the first pre-filter 501, the first frequency converter 502, the first postfilter 504, the first A.C. contactor group 505 and the first differential temperature controller 503, wherein the first pre-filter 501, the first frequency converter 502, the first postfilter 504, the first A.C. contactor group 505 are connected in series through threephase cable, the first frequency converter 502, the first differential temperature controller 503 are connected in series through Shielded Twisted Pair, and the first frequency converter 502, the first differential temperature controller 503 are connected in parallel to host computer 101 through the RS485 communication interface; Described coolant pump group frequency-changing control system 302 comprises the second A.C. contactor group 506, the second postfilter 507, the second frequency converter 508, the second differential temperature controller 509 and the second pre-filter 510, wherein the second A.C. contactor group 506, the second postfilter 507, the second frequency converter 508, the second pre-filter 510 are connected in series through threephase cable, the second frequency converter 508, the second differential temperature controller 509 are connected in series through Shielded Twisted Pair, and the second frequency converter 508, the second differential temperature controller 509 are connected in parallel to host computer 101 through the RS485 communication interface.
above-mentioned each sensor gathers the physical parameter of each equipment operation and is translated into normal voltage, current signal, described the first differential temperature controller 503 gathers cold water and supplies, backwater main temperature difference parameters, outputting standard voltage after PID calculates, electric current to the first frequency converter 502, adjust the running frequency parameter of frequency conversion water supply pump, the second differential temperature controller 509 gathers cooling confession, backwater main temperature difference parameters, outputting standard voltage after PID calculates, electric current to the second frequency converter 502, adjust the running frequency parameter of frequency conversion coolant pump, host computer 101 can be set the first differential temperature controller 503 when distance control mode simultaneously, the control temperature difference of the second differential temperature controller 509.Temperature Humidity Sensor 528 gathers the outdoor temperature humidity parameter, the first electrical quantity sensor group 531 gathers each cooling-water machine power consumption parameter, the first sets of temperature sensors 529 gathers the freezing of each cooling-water machines and advances, leaving water temperature parameter and coolingly advance, the leaving water temperature parameter, the second electrical quantity sensor group 524 gathers each water supply pump power consumption parameter, the second sets of temperature sensors 521 gathers cold water and supplies, backwater main temperature parameter, first flow sensor group 520 gathers cold water main discharge parameter, the first differential pressure pick-up 522 gathers cold water and supplies, backwater main differential pressure parameter, the 3rd electrical quantity sensor group 540 gathers cooling water pump power consumption parameter, three-temperature sensor group 541 gathers cooling water and supplies, backwater main temperature parameter, the second differential pressure pick-up 543 gathers cooling water and supplies, backwater main differential pressure parameter, gather each cooling tower power consumption parameter by the 4th electrical quantity sensor group 549.
above-mentioned each input module group gathers the normal voltage of each sensor, current parameters, input to host computer 101 through the RS485 communication interface, each analog input module group gathers the running state parameter of each system equipment, input to host computer 101 through the RS485 communication interface, the trip information that host computer obtains according to described each sensor, user's side refrigeration duty is carried out the prediction of dynamic analysis constantly, the equipment running status information of obtaining according to each digital quantity input module group, operation conditions and the running time of each equipment of monitoring central air conditioner system, background logic computational analysis finally by host computer 101, control heavy-current control system 103 by digital output module group, and then the optimum operation of control central air conditioner system.
In present embodiment, Temperature Humidity Sensor is the output of two-wire system 4～20mA electric current.By the 24VDC Power supply.Each electrical quantity sensor group is the output of two-wire system 4～20mA electric current, and concrete range is decided according to central air conditioning equipment, by the 24VDC Power supply.Each sets of temperature sensors is the output of two-wire system 4～20mA electric current, and precision ± 1%, range are 0 ~ 50 ℃, and concrete size is decided according to central air conditioning equipment, by the 24VDC Power supply.Each flow sensor group is the output of two-wire system 4～20mA electric current, and concrete range and size are decided according to central air conditioning equipment, by the 24VDC Power supply.Each differential pressure pick-up group is the output of two-wire system 4～20mA electric current, and concrete range and size are decided according to central air conditioning equipment, by the DC24V Power supply.Each AC intermediate relay group is the 220VAC auxiliary reclay.Each direct current auxiliary reclay group is the 24VDC auxiliary reclay.
Below more by reference to the accompanying drawings 6～10 and the relevant control pattern enforcement of above-mentioned Integral optimization control device of central air-conditioning system is described.
In Integral optimization control device of central air-conditioning system, local control and the Long-distance Control interlocking when being local control, in the local operation system, realized the control to central air conditioning equipment 104, and the operation conditions of central air conditioning equipment 104 feeds back to and host computer 101; When being Long-distance Control, host computer 101 is controlled central air conditioning equipment 104 by light-current system 102 systems and heavy-current control system 103, and the operational factor of central air conditioning equipment 104 feeds back to host computer 101.Long-distance Control is divided into again manual control model and automatic control mode, and manually control model be that the operator is directly by operating computer main frame 101, by light-current system 102 systems and 103 realizations of the heavy-current control system control to central air conditioning equipment 104; Automatic control mode is host computer 101 by light-current system 102 and heavy-current control system 103 monitoring central air conditioning equipments 104, and according to gather central air conditioning equipment 104 operational factors carry out computing, automatically regulate start and stop, water pump FREQUENCY CONTROL and loading and the unloading of central air conditioning equipment 104.The logical construction of control system as shown in Figure 6, handpiece Water Chilling Units 402 is adopted number of units team control and leaving water temperature control strategy, adopt number of units to control and separate unit VFC strategy to refrigerating water pump group 513 and coolant pump group 514, cooling tower group 519 is adopted number of units team control and leaving water temperature control strategy, coordinate to control according to the operational factor of central air conditioning equipment 104.
Each sensor gathers the physical parameter of central air conditioning equipment 104 operations and is translated into normal voltage, current signal, and wherein Temperature Humidity Sensor 528 gathers the outdoor temperature humidity parameter; The first 531 groups of electrical quantity sensors gather each cooling-water machine power consumption parameter; The first sets of temperature sensors 529 gathers freezing water-in and water-out temperature parameter and the cooling water-in and water-out temperature parameter of each cooling-water machine; The second electrical quantity sensor group 524 gathers each water supply pump power consumption parameter; The second sets of temperature sensors 521 collection cold water supply, backwater main temperature parameter; First flow sensor group 520 gathers chilled water main discharge parameter; The first differential pressure pick-up 522 collection cold water supply, backwater main differential pressure parameter; The 3rd electrical quantity sensor group 540 gathers cooling water pump power consumption parameter; Three-temperature sensor group 541 collection cooling waters supply, backwater main temperature parameter; The second differential pressure pick-up 543 collection cooling waters supply, backwater main differential pressure parameter; Gather each cooling tower power consumption parameter by the 4th electrical quantity sensor group 549.
The first differential temperature controller 503 collection cold water supply, backwater main temperature difference parameters, outputting standard voltage, electric current to the first frequency converter 502 after PID calculates, the running frequency parameter of adjustment frequency conversion water supply pump; The second differential temperature controller gathers cooling confession, backwater main temperature difference parameters, outputting standard voltage, electric current to the second frequency converter after PID calculates, the running frequency parameter of adjustment frequency conversion coolant pump.Host computer 101 can be set the control temperature difference of the first differential temperature controller 503, the second differential temperature controller when distance control mode simultaneously.
Monitoring to major parameters such as handpiece Water Chilling Units chilled water Inlet and outlet water temperature, cooling water Inlet and outlet water temperature, main engine power, main unit load rate, separate unit running times, unit with PC interface, can directly obtain each parameter of unit operation by its data communication agreement, and realize Long-distance Control; There is no PC interface or unknown device data communication agreement, send element to realize the analog quantization of each monitoring parameter by changes such as temperature sensor, power sensors, and be converted into data signal by data collecting card or data acquisition module, realize data communication by data network and workstation computer.The data analysis that utilization collects, processing, computational analysis unit load rate, refrigerating capacity, start handpiece Water Chilling Units according to outdoor environment, rate of load condensate, building enclosure and user job characteristic etc. optimizations automatically.When the remote auto control model, the operator can set the chilled water outlet temperature of different periods of different handpiece Water Chilling Units and import and export the temperature difference under the Artificial Control pattern, control the unlatching of handpiece Water Chilling Units, also can be by host computer 101 automatic optimals under the Based Intelligent Control pattern, select best chilled water leaving water temperature and the Inlet and outlet water temperature difference of different handpiece Water Chilling Units, and according to different load intervals control handpiece Water Chilling Units operation number of units, determine optimum energy-saving run and Managed Solution, realize that handpiece Water Chilling Units is in the optimum combination in different load interval.
To the supply and return water temperature of chilled water system 401, monitor for major parameters such as backwater pressure reduction, chilled-water flow, bypass flow, refrigerating water pump power, refrigerating water pump separate unit running times, ruuning situation according to outdoor air humiture, room conditioning load and main frame, host computer 101 calculates actual required minimum discharge under the lowest energy consumption condition in real time, then the chilled water pump frequency converter is carried out Long-distance Control, adopt temperature difference control, pressure reduction control, temperature difference pressure reduction to mix and control three kinds of conversion systems.When the remote auto control model, the operator can set the chilled water of different periods of different handpiece Water Chilling Units and import and export the temperature difference and pressure reduction under the Artificial Control pattern, select pressure reduction to control or temperature difference control model, also can be by host computer 101 automatic optimals under the Based Intelligent Control pattern, select temperature difference control, pressure reduction to control or temperature difference pressure reduction mixing control, select constantly Optimal Control temperature difference differential pressure, adopt PID to add the running frequency of control time control water pump, water pump is carried out many industrial frequency controls of separate unit pump variable frequency and number of units control; When local control model, the operator can arrange the chilled water supply backwater temperature difference on differential temperature controller, adopts PID to control the running frequency of water pump, and the host computer 101 local chilled water pump groups of monitoring are moved.
To the supply and return water temperature of cooling water system 403, monitor for major parameters such as backwater pressure reduction, cooling water flow, coolant pump power, coolant pump separate unit running times, ruuning situation according to outdoor air humiture, room conditioning load and main frame, host computer 101 calculates actual required minimum discharge under the lowest energy consumption condition in real time, then the cooling water pump frequency converter is carried out Long-distance Control, adopt the temperature difference to control and two kinds of conversion systems of pressure reduction control.When the remote auto control model, the operator can set the chilled water of different periods of different handpiece Water Chilling Units and import and export the temperature difference and pressure reduction under the Artificial Control pattern, select pressure reduction to control or temperature difference control model, also can be by host computer 101 automatic optimals under the Based Intelligent Control pattern, selecting the temperature difference to control differential pressure controls, real-time selection Optimal Control temperature difference differential pressure adopts PID to add the running frequency of control time control water pump, and water pump is carried out many industrial frequency controls of separate unit pump variable frequency and number of units control; When local control model, the operator can arrange the chilled water supply backwater temperature difference on differential temperature controller, adopts PID to control the running frequency of water pump, and the host computer 101 local cooling water pump groups of monitoring are moved.
As different in Fig. 7-Fig. 9 for backwater set under pressure reduction the frequency conversion effects relatively, when discharge is low (less than 100m
3/ h), adopt the energy consumption of 1 pump variable frequency minimum; Increase (100m along with discharge
3/ h-200m
3/ h), adopt the energy consumption of 2 pump variable frequencies minimum; Increase (200m along with discharge
3/ h-300m
3/ h), adopt the energy consumption of 3 pump variable frequencies minimum; Along with the increase of discharge (greater than 300m
3/ h), adopt the energy consumption of 4 pump variable frequencies minimum; Adopt simultaneously the energy consumption of 4 water pump power frequency operations the highest.The variable-flow operation of water pump is not only simple variable frequency adjustment, also should control according to systematic parameter coordination optimization water pump.
Power contrast during as many power frequency parallel runnings of Figure 10 water pump separate unit frequency conversion, during in the parallel connection pump of converting operation, the operation of variable frequency pump does not exert an influence basically to the operation of general pump when the water pump of power frequency operation.Variable frequency pump and general pump parallel running be feasible, but system's safe and stable operation and the cost saved.
To the monitoring of the major parameters such as the power of cooling tower group 518, separate unit running time, the cooling water supply backwater temperature difference ruuning situation according to outdoor air humiture, room conditioning load and main frame, 101 pairs of cooling tower groups 518 of host computer realize the number of units team control.
As seen, the present invention is workable, can realize the optimum control to each equipment of central air-conditioning, guarantees central air conditioner system Operation safety, stability and energy saving.By the long-distance intelligent control to handpiece Water Chilling Units, the rate of load condensate of in time adjusting handpiece Water Chilling Units distributes, and makes each handpiece Water Chilling Units be in the optimum efficiency running status, energy efficient, the operating cost that reduces.
Claims (5)
1. Integral optimization control device of central air-conditioning system, it is characterized in that described device comprises host computer (101), light-current system (102), heavy-current control system (103), wherein light-current system (102) and heavy-current control system (103) all are connected in parallel to host computer (101) by the RS485 communication interface, light-current system (102) comprises water chilling unit control system (201), refrigerating water pump set control system (202), coolant pump set control system (203), cooling tower set control system (204), motor-driven valve set control system (205), and wherein water chilling unit control system (201), refrigerating water pump set control system (202), coolant pump set control system (203), cooling tower set control system (204), motor-driven valve set control system (205) all are connected in parallel to host computer (101) by the RS485 communication interface, water chilling unit control system (201) comprises Temperature Humidity Sensor (528), the first sets of temperature sensors (529), the first analog input module group (530), the first electrical quantity sensor group (531), the first AC intermediate relay group (532), the first digital quantity input module group (533), the first direct current auxiliary reclay group (534) and the first digital output module group (535), the first sets of temperature sensors (529) wherein, Temperature Humidity Sensor (528), the first electrical quantity sensor group (531) is connected in parallel to the first analog input module group (530) through Shielded Twisted Pair, the first AC intermediate relay group (532) is connected to the first digital quantity input module group (533) through the 220VAC cable, the first direct current auxiliary reclay group (534) is connected to the first digital output module group (535) through the 24VDC cable, the first analog input module group (530), the first digital quantity input module group (533), the first digital output module group (535) is connected in parallel to host computer (101) through the RS485 communication interface, described refrigerating water pump set control system (202) comprises first flow sensor group (519), the second sets of temperature sensors (520), the second analog input module group (521), the first differential pressure pick-up (522), the second electrical quantity sensor group (523), the second AC intermediate relay group (524), the second digital quantity input module group (525), the second direct current auxiliary reclay group (526) and the second digital output module group (527), first flow sensor group (519) wherein, the second sets of temperature sensors (520), the first differential pressure pick-up (522), the second electrical quantity sensor group (523) is connected in parallel to the second analog input module group (521) through Shielded Twisted Pair, the second AC intermediate relay group (524) is connected to the second digital quantity input module group (525) through the 220VAC cable, the second direct current auxiliary reclay group (526) is connected to the second digital output module group (527) through the 24VDC cable, the second analog input module group (521), the second digital quantity input module group (525), the second digital output module group (527) are connected in parallel to host computer (101) through the RS485 communication interface, described coolant pump set control system (203) comprises the 3rd direct current auxiliary reclay group (536), the 3rd digital output module group (537), the 3rd AC intermediate relay group (538), the 3rd digital quantity input module group (539), the 3rd electrical quantity sensor group (540), three-temperature sensor group (541), the 3rd analog input module group (542), the second differential pressure pick-up (543) and second quantity sensor (544), wherein the 3rd electrical quantity sensor group (540), three-temperature sensor group (541), the second differential pressure pick-up (543), second quantity sensor (544) is connected in parallel to the 3rd analog input module group (542) through Shielded Twisted Pair, the 3rd AC intermediate relay group (538) is connected to the 3rd digital quantity input module group (539) through the 220VAC cable, the 3rd direct current auxiliary reclay group (536) is connected to the 3rd digital output module group (537) through the 24VDC cable, the 3rd analog input module group (542), the 3rd digital quantity input module group (539), the 3rd digital output module group (537) is connected in parallel to host computer (101) through the RS485 communication interface, described heavy-current control system (103) comprises refrigerating water pump group frequency-changing control system (301) and coolant pump group frequency-changing control system (302), and wherein refrigerating water pump group frequency-changing control system (301), coolant pump group frequency-changing control system (302) are connected in parallel to host computer (101) through the RS485 communication interface.
2. Integral optimization control device of central air-conditioning system according to claim 1, it is characterized in that, described cooling tower set control system (204) comprises the 4th direct current auxiliary reclay group (545), the 4th digital output module group (546) the 4th AC intermediate relay group (547), the 4th digital quantity input module group (548), the 4th electrical quantity sensor group (549) and the 4th analog input module group (550), wherein the 4th electrical quantity sensor group (549) is connected in parallel to the 4th analog input module group (550) through Shielded Twisted Pair, the 4th AC intermediate relay group (547) is connected to the 4th digital quantity input module group (548) through the 220VAC cable, the 4th direct current auxiliary reclay group (545) is connected to the 4th digital output module group (546) through the 24VAC cable, the 4th analog input module group (550), the 4th digital quantity input module group (548), the 4th digital output module group (546) is connected in parallel to host computer (101) through the RS485 communication interface.
3. Integral optimization control device of central air-conditioning system according to claim 1, it is characterized in that, described motor-driven valve set control system (205) comprises the 5th AC intermediate relay group (553), the 5th digital quantity input module group (554), the 5th direct current auxiliary reclay group (551) and the 5th digital output module group (552), wherein the 5th AC intermediate relay group (553) is connected to the 5th digital quantity input module group (554) through the 220VAC cable, the 5th direct current auxiliary reclay group (551) is connected to the 5th digital output module group (552) through the 24VAC cable, the 5th digital quantity input module group (554), the 5th digital output module group (552) is connected in parallel to host computer (101) through the RS485 communication interface.
4. Integral optimization control device of central air-conditioning system according to claim 1, it is characterized in that described refrigerating water pump group frequency-changing control system (301) comprises the first pre-filter (501), the first frequency converter (502), the first postfilter (504), the first A.C. contactor group (505) and the first differential temperature controller (503), the first pre-filter (501) wherein, the first frequency converter (502), the first postfilter (504), the first A.C. contactor group (505) is connected in series through threephase cable, the first frequency converter (502), the first differential temperature controller (503) is connected in series through Shielded Twisted Pair, the first frequency converter (502), the first differential temperature controller (503) is connected in parallel to host computer (101) through the RS485 communication interface.
5. Integral optimization control device of central air-conditioning system according to claim 1, it is characterized in that described coolant pump group frequency-changing control system (302) comprises the second A.C. contactor group (506), the second postfilter (507), the second frequency converter (508), the second differential temperature controller (509) and the second pre-filter (510), the second A.C. contactor group (506) wherein, the second postfilter (507), the second frequency converter (508), the second pre-filter (510) is connected in series through threephase cable, the second frequency converter (508), the second differential temperature controller (509) is connected in series through Shielded Twisted Pair, the second frequency converter (508), the second differential temperature controller (509) is connected in parallel to host computer (101) through the RS485 communication interface.
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| CN105243179B (en) * | 2015-09-01 | 2019-03-05 | 湖南集森节能环保科技有限公司 | The control method of determination method and the number of units plus-minus of frequency conversion pump group optimized operation number of units |
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