CN1619230A - Central air conditioning variable frequency energy saving control method - Google Patents
Central air conditioning variable frequency energy saving control method Download PDFInfo
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- CN1619230A CN1619230A CN 200410089172 CN200410089172A CN1619230A CN 1619230 A CN1619230 A CN 1619230A CN 200410089172 CN200410089172 CN 200410089172 CN 200410089172 A CN200410089172 A CN 200410089172A CN 1619230 A CN1619230 A CN 1619230A
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Abstract
The present invention relates to a central air-conditioning frequency conversion energy-saving control method. Said invention adopts microcomputer main controller to execute a series of steps, and combines hardware structure with control software and utilizes frequency conversion to make the refrigeration system obtain optimum working state.
Description
Technical field
The present invention relates to a kind of control method of central air-conditioning energy-saving and frequency-variable, particularly about the control method of the central air-conditioning energy-saving and frequency-variable of Absorption Refrigerator.
Background technology
The power consumption of central air conditioner system generally will account for more than 40% of all the building power consumption, and the central air-conditioning unit is to design with the maximum cold heat that satisfies the field of employment, generally all operates in the undercapacity load condition in actual applications; Learn that by year variation and diurnal variation that central air conditioner system is used most times of central air-conditioning are all in inefficient operation.And the heat exchanger optimal conversion efficiency is 5～7 ℃ in the chilled water design temperature difference, the design temperature difference of cooling water is 4～6 ℃, under the situation that flow system flow is fixed, annual exhausted major part temperature difference running time only is 1～3 ℃, promptly under the situation of the low temperature difference, big flow, work, not only increased the energy loss of pipe-line system, and rate of heat exchange reduces greatly.
The tradition Energy Saving Control is to control cooling water pump separately or chilled water pump carries out Energy Saving Control, because the centrifugal pump power output has the characteristic of best operating point, independent frequency conversion debugging makes the operating point of water pump often away from efficient best operating point energy, waste quite serious, therefore 20～30% of the power consumption duty adjusting system power consumption of air-conditioning water pump is saved the water pump system energy and is had very significance when hanging down load.CN01107645.3 proposes a kind of central air-conditioning intelligent and energy saving system, it adopts Programmable Logic Controller PLC, control by the expertise knowledge base, only detect water temperature and air temperature variations, analog quantity be provided with produce deviation and separately the frequency conversion debugging make the operating point of pump influence energy-saving effect away from optimum state etc.
Summary of the invention
The present invention is on the basis of the central air-conditioning energy saving control system of frequency conversion in use that has proposed, adopts the method for microcomputerized control software control central air-conditioning energy-saving and frequency-variable system operation, reaches the purpose of energy savings with the operating efficiency that improves central air-conditioning.
The central air-conditioning energy saving control system of frequency conversion in use comprises the temperature sampling controller A that cpu chip composition master controller I and cpu chip are formed, the input of master controller I inserts 485 communications, memory, analog quantity input and switching value input respectively, the output of master controller I is connected to relay output control and frequency converter output control respectively, the input of temperature sampling controller A meets sampling A a, b, c respectively, and the output of temperature sampling controller A is connected with 485 communication interfaces of master controller I by 485 communication interfaces.
Master controller I receives the temperature signal that temperature sampling device A transmits by 485 communication interfaces, by the pressure signal in analog quantity input central air-conditioning evaporimeter and the condenser by keyboard input control parameter.
Input master controller I establishes the expert and controls computing module, and the computing parameter comprises the parameter of default and the parameter that environmental monitoring is arrived.The monitoring parameter that system initialization is set has P
1The water vapor pressure of-refrigerant solution, P
2The saturated vapour pressure of-the chilled water that flows out from refrigeration machine, f
0-chilled water pump initial launch frequency, f
0' cooling water pump initial launch frequency.Chilled water turnover temperature T by temperature sampling controller A timing sampling
1, T
2, cooling water turnover temperature T
3, T
4Pressure P when carrying out heat exchange in the evaporimeter by pressure detecting cold-producing medium and chilled water
3
The parameter of above-mentioned setting and detection is carried out by being located at the operation program and the control program that store among the master controller I, and this computing and control program are carried out following steps:
The central air-conditioning frequency conversion energy-saving control method is characterized in that micro computer master controller execution following steps:
1. initialization system, the systematic parameter of monitoring and setting in real time, P
1, P
2, f
0, f
0';
2. temperature sampling controller A detects chilled water turnover temperature T
1, T
2And cooling water turnover temperature T
3, T
4, and input master controller I;
3. evaporating pressure P in the pressure detecting evaporimeter
3, and input master controller I;
4. master controller I is with the temperature T of input
1～T
4, pressure P
1～P
3Carry out the expert and control composite algorism, calculate the operating frequency of chilled water pump and cooling water pump motor;
5. master controller I judges a chilled water pump or cooling water pump will be increased or close to central air conditioner system whether under this working condition, is to carry out the corresponding sub-routine operation that opens or closes;
6. deny that the master controller I output controlled frequency converting analogue signal of telecommunication to Frequency Converter Control pump motor frequency conversion is turned round;
7. return trace routine, continue to carry out detection setup parameter and environmental change parameter.
Master controller I is by relay output module 8 output control signals, the work of control A.C. contactor, A.C. contactor is by with the in parallel of frequency converter or connect, make the present invention only use three motors of two Frequency Converter Control, can realize the VFC of wherein any two motors, another does standby or maintenance.
Temperature sampling controller A had both controlled the work of each sampling A, controlled sampled signal again and was transferred to master controller I, and the cooling water that the temperature sampling module is installed in the central air-conditioning cooling system according to system's actual conditions is gone into the delivery port of going into of delivery port, chilled water.The temperature sampling chip is the high-performance digital temperature sensor, be close to placement with sampled point, can farthest realize scene temperature record quick and precisely, adopt 485 standard communications between temperature sampling controller A and the master controller I, can realize that the instantaneous transmission temperature data is to master control system, can prevent the on-the-spot forceful electric power and the interference of electromagnetic field again, and the decay of having avoided the long Distance Transmission of sampled signal to cause, for energy saving control system of frequency conversion in use provides good control basis.
The present invention compares with traditional central air-conditioning energy-saving system, and the good energy-saving effect of temperature control effect is remarkable.Major advantage has the frequency conversion that can realize multiple electric motors to switch, and do not need rewiring, thereby the service time of reasonably dividing gas-distributing motor, reduce the motor wearing and tearing, prolong motor average life, can be in the frequency-converting control device fault, power frequency switches to standby motor, does not influence the normal operation of system; At frequency conversion output 50Hz but flow system flow when still not enough, can open second water pump power frequency running automatically, first water pump proceeded VFC, if this moment, first water pump control frequency reached 50Hz again, then open the 3rd water pump power frequency running again, the continuation VFC of first water pump.Thereby the required flow of assurance system by that analogy is operated in optimum state, temperature sampling is adopted a layout next-door neighbour sampled point transmit temperature sampling precision height with 485 communications, and the sampled data transmission is reliable.Characteristics according to refrigeration system are implemented combination frequency control to cooling water and chilled-water flow, make refrigeration system reach optimum working efficiency, thereby have avoided energy-conservation on pump, but the phenomenon of waste energy on refrigeration machine.
Description of drawings
Fig. 1 is the main controller controls flow chart.
Fig. 2 is master controller I and temperature sampling controller A structured flowchart.
Fig. 3 is for calculating the controlled frequency flow chart.
Fig. 4 is for adopting the pid algorithm calculation flow chart.
Fig. 5 opens or closes the water pump flow chart for system's control.
The specific embodiment
Fig. 2 is on the basis that Fig. 1 structure exists, and supports the master control program flow chart of present embodiment, in order to realize algorithm control strategy of the present invention.Specifically describe as follows: after the start-up system, with whole system initialization (for example step 101), begin to gather environment temperature, evaporator pressure and system mode (step 102,103), calculate the output controlled frequency (step 104) of cooling water, chilled water, judge whether to establish newly (a closing) cooling (freezing) pump motor (step 105,107) according to the frequency that calculates, be, then carry out corresponding operation (step 106,109),, then do not export the controlled frequency (step 109) of frequency converter.
Based on above-mentioned control strategy, its subprogram can adopt following method to realize:
After setting up procedure 100, step 101 is system initialization, comprises 1. setting p at the various central air conditioner systems that adopt absorption unit
1(water vapor pressure of refrigerant solution) and p
2(saturated vapor pressure of the chilled water that flows out from refrigeration machine); 2. set the initial launch frequency f of cooling water and chilled water pump
0And f
0' be 50Hz, and open a chilled water pump and a cooling water pump moves under original frequency, air-conditioning system is moved, and even pipe temperature; 3. after the process initial launch time (can set, system default is set 15 minutes), initialization finishes.
After initialization step 101 is finished, beginning collecting temperature signal (step 102) and pressure signal (step 103).
Step 104 is control algolithm parts of this program, and Fig. 3 is for calculating controlled frequency flow process subroutine flow chart.The step 401 pair signal that collects carries out digital filtering to be handled, and rejecting abnormalities numerical value is avoided system misoperation; Step 402 is that one-period is 100 seconds a time delay subroutine, delay time is to then calculating controlled frequency one time, otherwise export the controlled frequency that previous computation of Period obtains, do like this and can avoid evaporimeter that the frequent variations owing to the water pump operation frequency causes and the level fluctuation in the condenser; Step 403 is for to revise algorithm automatically based on the cooling water control temperature difference of environment temperature, because the difference of environment temperature can cause the variation of cooling tower return water temperature, we have introduced " modifying factor " of the cooling water control temperature difference for this reason.By day and the high period of equitemperature in summer, factor values diminishes, and the control temperature difference is reduced, and improves the cooling water system circular flow; At night and the low slightly period of spring and summer equitemperature, modifying factor subvalue becomes greatly, increases the control temperature difference, reduces the systemic circulation flow, further energy savings.
The cooling water control temperature difference t that General System is set
2=5, temperature correction coefficient f (ts) determines according to table 1:
Table 1
| Environment temperature t s | t s＜＝25 | 25＜t s＜＝28 | 28＜t s＜＝30 | ?30＜t s |
| ?f(ts) | 5 | 3 | 1 | ?0 |
Then the cooling range that will control of system is Tc=t '
2+ f (ts);
Make e
k=t
2-| T
1-T
2|, then the controlled frequency that is caused by the temperature difference is changed to
Δ f=K
p(e
k-e
K-1)+K
Ie
k+ K
D(e
k-2e
K-1+ e
K-2) t
2And K
p, K
I, K
DCan import by keyboard;
If the backwater of cooling water and leaving water temperature are respectively T
3, T
4, Tc is the cooling water control temperature difference, makes e '
k=Tc-|T
3-T
4|, then the controlled frequency that is caused by the temperature difference is changed to
Δ f '=K '
p(e '
k-e '
K-1)+K '
IE '
k+ K '
D(e '
k-2e '
K-1+ e '
K-2) t '
2And K '
p, K '
I, K '
DCan import by keyboard;
The increment type control algolithm that pid control algorithm adopts integration to separate.Introducing the purpose of integral element in common pid number controller, mainly is in order to eliminate static difference, to improve precision.But when the startup of process, end or increase and decrease setting value significantly, system's output has very big deviation in short time, can cause the integration accumulation of PID computing, cause the limit controlled quentity controlled variable of the controlled quentity controlled variable of computing above executing agency's possibility maximum actuation scope correspondence, finally cause the overshoot that system is bigger, even cause the vibration of system.Integral separation PID controling algorithm has been set threshold epsilon＞0, | e (k) | only adopt PD control (differential algorithm) during＞ε, can avoid excessive super bar, make system that response is faster arranged again; When | e (k) | introduce PI control (integral algorithm) during＜=ε, can guarantee the control accuracy of system.
Adopt the PID controller of increment type, only need to use three deviation of measuring value in front and back can calculate the control increment Delta u (k) of output, do not need to carry out accumulating operation.
Master controller I carries out pid algorithm flow chart subprogram as shown in Figure 4, and the algorithm software of the original program of relevant pid algorithm sees appendix one, (this specification the 9th page to the 13rd page).
Chilled water, the compound control of cooling water flow can make chilled water fully take away heat, chilled water and cold-producing medium in the room to carry out sufficient heat exchange, cold-producing medium and cooling water and carry out sufficient heat exchange, thereby comprehensively improve the operational efficiency of refrigeration system, reach the purpose of economize on electricity.
The factor of chilled water circulating pump frequency shift comprises the influence of evaporating pressure to the chilled water pump output frequency
Cause the last control chilled water pump of increase Δ f and the system output frequency f of frequency by circumstance of temperature difference
K-1, compound flow controlled frequency f is tried to achieve in these three factor additions
kPromptly to chilled water circulating pump:
F in the formula
kBe chilled water pump output frequency, f
K-1Be last control output frequency constantly
p
1Water vapor pressure for refrigerant solution
p
2The saturated vapor pressure of the chilled water that flows out from refrigeration machine
p
3Pressure when carrying out heat exchange for cold-producing medium and chilled water
Δ f=K
p(e
k-e
K-1)+K
1e
k+ K
D(e
k-2e
K-1+ e
K-2) be the frequency recruitment that causes by the temperature difference
f
K-1Chilled water system previous moment output frequency
k
1Proportionality coefficient
The factor of cooling water circulating pump frequency shift comprises by circumstance of temperature difference and causes that the increase Δ f of frequency deducts by the influence of chilled water pump output frequency to the cooling water pump output frequency, the last control chilled water pump output frequency f ' of the system that adds
K-1Promptly to cooling water circulating pump:
f′
k＝Δf′-k
2f
k+f
k-1????(2)
Δ f '=K '
p(e '
k-e '
K-1)+K '
IE '
k+ K '
D(e '
k-2e '
K-1+ e '
K-2) be the frequency recruitment that causes by the temperature difference
k
2Proportionality coefficient
f
kBe the chilled water pump output frequency
F '
K-1Cooling water system previous moment output frequency
Chilled-water flow control based on evaporating pressure
In the formula (1)
Obtain like this:
In Absorption Refrigerator (is example with the lithium bromide absorption-type machine unit), the evaporating pressure as the water (hereinafter referred to as water as refrigerant) of cold-producing medium must remain on 0.87～2.07kPa.Therefore, in the lithium-bromide absorption-type refrigerating machine group, water as refrigerant is sweat cooling under low pressure, by the variation of mass fraction in absorption and generating process of solution, realizes the kind of refrigeration cycle of water as refrigerant.For example in the time of 25 ℃, mass fraction is that the water vapor pressure of 50% lithium-bromide solution only is 0.80kPa, and the saturated vapor pressure of water in the time of 25 ℃ is about 3.16kPa.This shows that lithium-bromide solution has the ability of strong absorption moisture.As long as the pressure of water vapour is greater than 0.80kPa, as 0.93kPa (the water saturation temperature is 6 ℃), in the time of will be by 25 ℃, 50% lithium-bromide solution absorbs, therefore lithium-bromide solution has the ability of the much lower water vapour of its temperature of absorptance, and it can be used as the reason of absorption unit working medium just for this.
In the refrigeration system, we suppose that the mass fraction of operating temperature in the evaporimeter and lithium-bromide solution is known and constant, and then we can know the water vapor pressure P of lithium-bromide solution
1If we require the chilled water temperature of evaporator outlet will be controlled at 10 ℃, and 10 ℃ water saturation vapour pressure is P
2The pressure that we record in the evaporimeter as if any time is P
3, we can obtain the control formula of chilled-water flow qualitatively:
Q: chilled-water flow
Q
0: the minimum output flow of chilled water
K: proportionality coefficient
And the flow of chilled water is proportional to rotating speed of motor, and rotating speed of motor is proportional to the controlled frequency of frequency converter output, and then following formula can be written as:
Step 105 judges whether to increase or to close a pump according to the controlled frequency and some systematic parameters that calculate cooling water and chilled water pump.The subprogram flow process that step 106 opens or closes for system's control for the application drawing 5 of carrying out switch, if controlled frequency arrives upper limiting frequency, in process timing (step 608, timing time is set in initialize routine, be 15 minutes) after, if controlled frequency still is a upper limiting frequency, then increase a pump (step 611), if under the situation of full open, then report to the police (step 613) at pump; If controlled frequency reaches lower frequency limit, in process timing (step 603, timing time is set in initialize routine, be 15 minutes) after, if controlled frequency still is a lower frequency limit, then close a pump (step 606), under the situation of having only a pump operation, no longer close pump, this pump moves in the minimum operation frequency.Controlled frequency is between upper limit 50Hz and the lower limit 35Hz, step 109 and 614 is all carried out the output frequency converting analogue signal of telecommunication to Frequency Converter Control pump motor and is turned round, can adopt analog current or voltage signal, convert 15～20mA current signal to as 35Hz～50Hz.
It is 38 degree that simultaneity factor is provided with the highest alarm temperature of coolant outlet, if reach alarm temperature, then exporting controlled frequency is 50Hz; After 15 minutes, if leaving water temperature is still spent more than or equal to 38, then system alarm points out the staff to open stand-by pump (if select the automatic switching control equipment of native system for use, then can open stand-by pump automatically) at the controlled frequency of exporting 50Hz.
Step 106,108 is an ON/OFF water pump subprogram.With step 106 is example, when the output frequency of frequency converter reaches capping (native system is 50Hz), still can not reach the control effect if pass through the setting-up time (native system is 15 minutes) of system again, then increases a pump.If first pump of our regulation operation is numbered 1, remaining pump number consecutively is 2,3 ..., No. 2 pumps of then increasing are in 50Hz (power frequency) operation, and No. 1 pump drops to the operation of lower limit running frequency by upper limit running frequency, and No. 1 pump is continued to implement VFC; If increased pump No. 3, then 2, No. 3 pumps move under power frequency, continue No. 1 pump is implemented VFC.
When the controlled frequency of frequency converter output is lower than the lower limit (native system is 35Hz) of regulation, still can not reach the control effect if pass through the setting-up time (native system is 15 minutes) of system again, under situation more than a pump operation, close a pump, otherwise pump is exported minimum controlled frequency (35Hz), and returns main program.In closing the process of pump, close No. 1 the longest pump of running time earlier, No. 2 pump is in power frequency operation, and No. 3 pumps are implemented VFC, and controlled frequency begins to descend from 50Hz; If need close 1 pump again, then close pump No. 2, No. 3 pump begins VFC from 50Hz.When system has only a pump, no longer close pump.
Adopt hardware configuration of the present invention to combine, have preferable temperature control effect with control software.Compare with traditional central air-conditioning energy-saving system, mainly contain following advantage:
The frequency conversion that can realize multiple electric motors is switched, and realizes that by control contactor the frequency conversion between main motor and the standby motor switches, and does not need rewiring, thereby reasonably divide the service time of gas-distributing motor, reduces the motor wearing and tearing, prolongation motor average life; Can be in the frequency-converting control device fault, power frequency switches to standby motor, does not influence the normal operation of system; Output to 50Hz but flow system flow when still not enough in frequency conversion, can open second water pump power frequency running automatically, first water pump proceeded VFC, if this moment, first water pump control frequency reached 50Hz again, then open the 3rd water pump power frequency running again, first is continued VFC, by that analogy, thus the required flow of assurance system; The next-door neighbour of temperature sampling system temperature sampling point transmits sampled data with main controller by RS485, temperature sampling precision height; System has introduced temperature difference modifying factor in to the cooling water pump VFC, can revise the control temperature difference automatically according to environment temperature, and control had a narrow range of temperature when realization temperature was high, the control temperature difference was big slightly when temperature was low, improved the energy saving of system effect; System has adopted the changes in flow rate algorithm based on the compound control of pressure in to the chilled water pump VFC, thereby has guaranteed that good thermal exchange efficient is arranged between cold-producing medium and the chilled water; System implements compound control according to the characteristics of refrigeration system to cooling water, chilled-water flow, make refrigeration system reach the optimum working efficiency point, thereby avoided " energy-conservation on pump, as but on refrigeration machine, to consume energy ", the situation that has reduced energy-saving effect and even wasted energy.
MAIN_PIDSTART： CALL inveter_start JB Flag_pid，main_pid MOV bClose_times，#0 MOV bDA_DATA，bRun_startcur CALL DA_OUT1 CALL DA_OUT2 MOV A，bRun_starttime2 JZ main_ctrb1 INC bTimes_2s CLR c MOV A，bTimes_2s SUBB A，#5 JC main_ctr21 INC bTimes_10s MOV bTimes_2s，#0 CLR c MOV A，bTimes_10s SUBB A，bRun_starttime2 JC main_ctr21 main_ctrb1： MOV bTimes_10s，#0 SETB Flag_pid MOV A，bDA_DATA MOV R0，#cTIMES_RR MOV R6，#0 M_LOOP1：CLR C RLC A MOV R7，A MOV A，R6 RLC A MOV R6，A MOV A，R7 DJNZ R0，M_LOOP1 MOV UoutHIgh，R6 MOV UoutLow，R7 main_ctr21：JMP main_loop ；---------------------------------------- main_pid： main_pid2：MOV bClose_times，#0 MOV R2，bTemp_hexinH MOV R3，bTemp_hexinL <!-- SIPO <DP n="9"> --> <dp n="d9"/> MOV R4，bTemp_hexoutH MOV R5，bTemp_hexoutL CALL BSUB MOV A，R6 CLR ACC.7 MOV R6，A MOV INHIGH，R6 MOV INLOW，R7 PID： MOV E1LOW，E2LOW MOV E1HIGH，E2HIGH MOV R3，INLOW MOV R2，INHIGH MOV R5，bCtr_tempdif2 MOV R4，#0 LCALL BSUB MOV A，R6 CLR ACC.7 JZ PA2 MOV R7，#0FFH MOV A，R6 ANL A，#80H MOV R6，A PA2： MOV E2HIGH，R6 MOV E2LOW， R7 MOV R2，E2HIGH MOV R3，E2LOW MOV R4，E1HIGH MOV R5，E1LOW LCALL BSUB MOV A，R6 CLR ACC.7 JZ PA21 MOV R7，#0FFH MOV A，R6 ANL A，#80H MOV R6，A PA21： MOV A，R6 <!-- SIPO <DP n="10"> --> <dp n="d10"/> MOV REG3，A MOV A，R7 MOV REG4，A MOV A，REG4 MOV B，bCtr_p MUL AB MOV R3，A MOV A，B 0RL A，REG3 MOV R2，A CLR C MOV A，E2LOW SUBB A，bDEAD_TEMP JNC PID_1 SET Flag_i JMP PID_2 PID_1： JNB flag_i，PID_2 SUBB A，#10 JC PID_2 CLR Flag_i PID_2： MOV R4，#0 MOV R5，#0 MOV B，bCtr_d JNB Flag_i，no_pid_i MOV B，bctr_i no_pid_i： MOV A，E2LOW MUL AB MOV R5，A MOV A，B ORL A，E2HIGH MOV R4，A LCALL BADD MOV REG0，R6 MOV REG1，R7 MOV 02，06 MOV 03，07 <!-- SIPO <DP n="11"> --> <dp n="d11"/> MOV R4，UoutHIGH MOV R5，UoutLOW CALL BADD MOV UoutHIGH，R6 MOV UoutLOW，R7 MOV A，R6 JNB ACC.7，PID_5 MOV bDA_DATA，#0 JMP PID_DAOUT PID_5： MOV R0，#cTIMES_RR MOV A，R6 CLR ACC，7 MOV R6，A S2： CLR C MOV A，R6 RRC A MOV R6，A MOV A，R7 RRC A MOV R7，A DJNZ R0，S2 MOV A，R6 JZ PID_6 MOV bDA_DATA，#0FFH MOV A，bDA_DATA MOV R0，#cTIMES_RR MOV R6，#0 M_LOOP4： CLR C RLC A MOV R7，A MOV A，R6 RLC A MOV R6，A MOV A，R7 DJNZ R0，M_LOOP4 MOV UoutHIgh，R6 MOV UoutLow，R7 JMP PID_DAOUT <!-- SIPO <DP n="12"> --> <dp n="d12"/> PID_6： MOV bDA_DATA，R7 PID_DAOUT： MOV A，bDA_DATA CLR c SUBB A，bMax_cur JC pid_7 MOV bDA_DATA，bMax_cur MOV A，bDA_DATA MOV R0，#cTIMES_RR MOV R6，#0 M_LOOP2： CLR C RLC A MOV R7，A MOV A，R6 RLC A MOV R6，A MOV A，R7 DJNZ R0，M_LOOP2 MOV UoutHIgh，R6 MOV UoutLow，R7 JMP pid_out PID_7： MOV A，bDA_DATA CLR C SUBB A，bMin_cur JNC pid_out MOV bDA_DATA，bMin_cur MOV A，bDA_DATA MOV R0，#cTIMES_RR MOV R6，#0 M_LOOP3：CLR C RLC A MOV R7，A MOV A，R6 RLC A MOV R6，A MOV A，R7 DJNZ R0，M_LOOP3 MOV UoutHIgh，R6 MOV UoutLow，R7 pid_out： <!-- SIPO <DP n="13"> --> <dp n="d13"/> CALL PUMP2_WORK CALL DA_OUT1 CALL DA_OUT2
Claims (7)
1, central air-conditioning frequency conversion energy-saving control method is characterized in that micro computer master controller execution following steps:
1. initialization system, the systematic parameter of monitoring and setting in real time, P
1, P
2, f
0, f
0';
2. temperature sampling controller A detects chilled water turnover temperature T
1, T
2And cooling water turnover temperature T
3, T
4, and input master controller I;
3. evaporating pressure P in the pressure detecting evaporimeter
3, and input master controller I;
4. master controller I is with the temperature T of input
1～T
4, pressure P
1～P
3Carry out the expert and control composite algorism, calculate the operating frequency of chilled water pump and cooling water pump motor;
5. master controller I judges a chilled water pump or cooling water pump will be increased or close to central air conditioner system whether under this working condition, is to carry out the corresponding sub-routine operation that opens or closes;
6. deny that the master controller I output controlled frequency converting analogue signal of telecommunication to Frequency Converter Control pump motor frequency conversion is turned round;
7. return trace routine, continue to carry out detection setup parameter and environmental change parameter.
2, central air-conditioning frequency conversion energy-saving control method according to claim 1, it is characterized in that the expert controls the increment type PID control algolithm of one of composite algorism for adopting integration to separate, the PID integration separates control algolithm, set the threshold value of ε＞0, | e (k) | only adopt the control of PD differential algorithm during＞ε, when | e (k) | introduce the control of PI integral algorithm during＜=ε.
3, central air-conditioning frequency conversion energy-saving control method according to claim 1 is characterized in that the expert controls one of composite algorism for calculating the compound flow controlled frequency of chilled water circulating pump f
kAnd the compound flow controlled frequency of calculating cooling water pump f
k'.
4, central air-conditioning frequency conversion energy-saving control method according to claim 3 is characterized in that the compound flow controlled frequency of chilled water circulating pump f
kBy the influence of evaporating pressure to the chilled water pump output frequency
, cause the last control chilled water pump of increase Δ f and the system output frequency f of frequency by circumstance of temperature difference
K-1Addition is formed.
5, central air-conditioning frequency conversion energy-saving control method according to claim 3 is characterized in that the compound flow controlled frequency of cooling water circulating pump f
k' cause that by circumstance of temperature difference the increase Δ f of frequency deducts by the chilled water pump output frequency cooling water pump output frequency K
2The influence of f, the last control chilled water pump output frequency f ' of the system that adds
K-1Form.
6, central air-conditioning frequency conversion energy-saving control method according to claim 1, it is characterized in that master controller I judges whether system will increase or close a pump, if controlled frequency arrives upper limiting frequency 50Hz, through still turning round after the timing in 15 minutes at upper limiting frequency 50Hz, then increase a pump, if pump is all opened, then report to the police; If controlled frequency reaches lower frequency limit 35Hz, still be lower frequency limit 35Hz through timing in 15 minutes, then close a pump.
7, central air-conditioning frequency conversion energy-saving control method according to claim 1, when it is characterized in that master controller I judges that system frequency is between upper frequency limit 50Hz and lower limit 35Hz, master controller I carries out the output frequency converting analogue signal of telecommunication to Frequency Converter Control pump motor and turns round.
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| CNB2004100891727A Expired - Fee Related CN1300515C (en) | 2004-12-07 | 2004-12-07 | Central air conditioning variable frequency energy saving control method |
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| CN104913465A (en) * | 2015-04-27 | 2015-09-16 | 北京德利迅达科技有限公司 | Automatic control system and method for temperature and humidity of data center computer room |
| CN105636266A (en) * | 2016-01-19 | 2016-06-01 | 河南海林自控设备有限公司 | Energy-saving monitoring system for civil air defense |
| CN108479430A (en) * | 2018-05-10 | 2018-09-04 | 青岛大学附属医院 | A kind of nano-magnetic hemodialysis membrane and preparation method thereof |
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| CN101571308B (en) * | 2008-04-28 | 2010-12-22 | 上海瀚艺冷冻机械有限公司 | PLC energy saving control method of frozen water pump and cooling water pump in central air-conditioning system |
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| CN2331900Y (en) * | 1998-08-05 | 1999-08-04 | 广州新菱冷气集团有限公司 | Variable frequency energy-saving controller for water pump of air conditioner |
| JP2002195681A (en) * | 2000-12-22 | 2002-07-10 | Honda Motor Co Ltd | Absorption refrigerator |
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| CN2472116Y (en) * | 2001-03-20 | 2002-01-16 | 广东省科学院自动化工程研制中心 | Fuzzy control energy saver for central air conditioner |
| JP2004309032A (en) * | 2003-04-08 | 2004-11-04 | Hiroshi Ogawa | Central air conditioning and heating equipment and its operation control method |
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| CN103322648B (en) * | 2013-06-13 | 2016-09-14 | 浙江工业大学 | A kind of indoor temperature dynamic matrix predictive control method of central air-conditioning |
| CN103322648A (en) * | 2013-06-13 | 2013-09-25 | 浙江工业大学 | Indoor temperature dynamic matrix predictive control method for central air conditioner |
| CN104534610A (en) * | 2014-07-07 | 2015-04-22 | 陈好 | Intelligent control operation method of central air conditioner energy-saving system |
| CN104534610B (en) * | 2014-07-07 | 2017-07-07 | 陈好 | A kind of central air-conditioning energy-saving system Based Intelligent Control operation method |
| CN104913465A (en) * | 2015-04-27 | 2015-09-16 | 北京德利迅达科技有限公司 | Automatic control system and method for temperature and humidity of data center computer room |
| CN104913465B (en) * | 2015-04-27 | 2017-12-01 | 北京德利迅达科技有限公司 | Data center machine room temperature and humidity regimes and method |
| CN105636266A (en) * | 2016-01-19 | 2016-06-01 | 河南海林自控设备有限公司 | Energy-saving monitoring system for civil air defense |
| CN110017634A (en) * | 2018-01-08 | 2019-07-16 | 杭州先途电子有限公司 | A kind of control method of electric expansion valve |
| CN110017634B (en) * | 2018-01-08 | 2021-04-13 | 杭州先途电子有限公司 | Control method of electronic expansion valve |
| CN108479430A (en) * | 2018-05-10 | 2018-09-04 | 青岛大学附属医院 | A kind of nano-magnetic hemodialysis membrane and preparation method thereof |
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