CN101539151A - Method and device for controlling inverter compressor - Google Patents
Method and device for controlling inverter compressor Download PDFInfo
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- CN101539151A CN101539151A CN200810084690A CN200810084690A CN101539151A CN 101539151 A CN101539151 A CN 101539151A CN 200810084690 A CN200810084690 A CN 200810084690A CN 200810084690 A CN200810084690 A CN 200810084690A CN 101539151 A CN101539151 A CN 101539151A
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Abstract
The invention discloses a method for controlling an inverter compressor. According to the method, a target temperature and a dividing temperature point are preset, and a sensor monitors an actual temperature value. The method comprises the following steps that: a controller judges whether the difference between an actual temperature and the target temperature is zero, and the compressor operates at a minimum frequency for a certain period if the difference between an actual temperature and the target temperature is zero; the controller judges whether the target temperature is reached, and the compressor stops operation if the target temperature is reached, or the controller initializes a PID parameter to allow an inverter to make the compressor start to raise frequency quickly if the target temperature is not reached; the controller judges whether the preset dividing temperature point is reached, and the PID parameter is adjusted if the preset dividing temperature point is reached, or the PID parameter is kept constant if the reset dividing temperature point is not reached; and the controller judges whether the target temperature is reached, and the compressor operates at a constant frequency and the frequency inversion is finished if the target temperature is reached, or the compressor raises frequency while keeping the original PID parameter if the target temperature is not reached. Correspondingly, the invention also provides a device for controlling the inverter compressor. The method and the device can realize a quick, energy-saving and stable frequency inversion process at the same time.
Description
Technical field
The present invention relates to the HVAC technical field, particularly a kind of controlling method of frequency-changeable compressor and device.
Background technique
At present, converter technique is more and more used in systems such as air-conditioning, refrigeration, HVAC, frequency-changeable compressor can be adjusted the frequency of okperation of compressor drum according to cold/heat load of reality, thus the refrigerant circulation of control compressor and the cold medium flux that enters heat exchanger.Frequency of okperation is high more, the flow of refrigerant is big more, refrigeration/heat is big more, refrigeration/heat energy power is also just strong more, and traditional invariable frequency compressor is all the time at certain frequency run, when reality does not need corresponding refrigeration/heat, just caused the waste of the energy, therefore energy-efficient converter technique advantage under the background of global energy growing tension is also more and more obvious.
For converter technique, the converting operation method of control compressor directly influences refrigeration/heat and energy-saving effect, and the most frequently used method is exactly PID (proportion integration differentiation algorithm) control.The centrifugal central air-conditioner unit of the frequency conversion magnetic levitation of common concern is an example in the air conditioner industry to be subjected at present, when true temperature is higher than target temperature, controller is exported one group of pid parameter and is given frequency variator, regulate compressor according to constant substantially speed raising frequency by frequency variator, wherein, the corresponding different frequency change rate of different pid parameter.
Fig. 1 is the schematic representation that PID control compressor frequency changes in the prior art, pairing compressor frequency when M represents to reach actual required refrigerating capacity among the figure.As shown in Figure 1, if one group of pid parameter A of output, the frequency of compressor i.e. mode shown in curve A changes, incipient stage frequency conversion speed is very big, rise to crest fast, arrive target temperature, but surpassed actual required refrigerating capacity, compressor is again with very big speed frequency reducing thereupon, high speed raising frequency again when refrigerating capacity is not enough so repeatedly, makes the raising frequency frequency reducing of high frequent, up to being stabilized in target temperature, long-time running causes fault easily and causes the waste of energy; If one group of pid parameter D of output, the frequency of compressor i.e. mode shown in curve D changes, though speed is slower all the time, but frequency conversion is mild, overshoot that can the frequency of occurrences and lifting frequency repeatedly, but reach required target temperature gradually stably, if true temperature is mutually far short of what is expected from target temperature, then the temperature rate of descent is slower in the raising frequency process, does not only reach refrigeration in the short time, and can the more energy of waste in this process.Among Fig. 1 shown in the curve C be the regulative mode that generally adopts at present, more stable with respect to its amplitude of variation of curve A, fluctuation is little, and its time that arrives target temperature shortens with respect to curve B, and efficient increases, but General is still not satisfactory.
In the prior art, no matter with which kind of conversion method, because raising frequency all adopts fixing pid parameter in the process frequently, thereby only be defined in a kind of constant substantially frequency conversion speed, in reaching the process of target temperature, can not regulate frequency conversion speed, therefore can't realize quick, energy-conservation and stable conversion process simultaneously according to actual conditions.
Summary of the invention
The purpose of this invention is to provide a kind of controlling method quick, energy-conservation and frequency-changeable compressor stably and device.
For addressing the above problem, the invention provides a kind of controlling method of frequency-changeable compressor, it is characterized in that, preestablish target temperature and segmentation temperature spots, the sensor monitors actual temperature value, described method comprises:
Steps A: controller judges whether the temperature difference of true temperature and target temperature is zero, and if not, compressor moves certain hour with low-limit frequency;
Step B: controller judges whether to reach target temperature, if then stop compressor operating; If not, then controller is given the pid parameter initialize, and frequency variator makes the quick raising frequency of compressor starts;
Step C: controller judges whether to arrive the segmentation temperature spots of setting, if, then adjust pid parameter, enter step D then; If not, keep original pid parameter;
Step D: controller judges whether to reach target temperature, if then compressor moves with fixed frequency, frequency conversion finishes; If not, then keep original pid parameter to make the compressor raising frequency, return step C.
The segmentation temperature spots that is used to judge among the described step C is set three at least.
Setting temperature variance ratio limit value also comprises step M between described step C and the step D: controller judges whether rate of temperature change surpasses limit value, if then adjust pid parameter rate of temperature change is reduced; If not, then enter step D.
Also comprise step e after the described step D: judge that true temperature is with respect to whether overshoot of target temperature, if then carry out the frequency reducing adjusting.
Set overshoot temperature difference limit value, carry out the frequency reducing adjusting in the described step e and comprise: start frequency reducing for the pid parameter assignment, judge whether the temperature difference of overshoot surpasses described overshoot temperature difference limit value, if not, then Gu Ding pid parameter is constant; If then adjust the quick frequency reducing of pid parameter.
Correspondingly, the present invention also provides a kind of control gear of frequency-changeable compressor, it is characterized in that, comprising: sensor, controller and frequency variator; Wherein, described sensor is used to monitor the true temperature of year cold/thermit powder and the temperature that records is sent to controller, the temperature difference that described controller is used for the true temperature that records according to sensor and target temperature is set and is changed pid parameter and carries out frequency change control, and described frequency variator is used for changing the compressor operating frequency under the control of controller.
Described controller is used to also judge whether actual rate of temperature change surpasses limit value, if then adjust pid parameter rate of temperature change is reduced.
Described controller also is used to judge true temperature with respect to whether overshoot of target temperature, if then carry out frequency reducing and regulate.
Compared with prior art, the present invention has the following advantages: conversion process is sectional-regulated, begin quick raising frequency, improve refrigerating efficiency, progressively reduce raising frequency speed subsequently, slowly near target temperature, prevent overshoot, avoid frequent lifting frequency, shortened cooling time on the whole, also saved the energy simultaneously; Further, the monitoring temperature variance ratio has prevented that effectively rate of temperature change from exceeding limit value in real time, but guarantees the stability of system's operation.
Description of drawings
By the more specifically explanation of the preferred embodiments of the present invention shown in the accompanying drawing, above-mentioned and other purpose, feature and advantage of the present invention will be more clear.Reference character identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing in proportion, focus on illustrating purport of the present invention.
Fig. 1 is the schematic representation that PID control compressor frequency changes in the prior art;
Fig. 2 is the control gear schematic representation of frequency-changeable compressor in the embodiment of the invention one;
Fig. 3 is the flow chart of the controlling method of frequency-changeable compressor in the embodiment of the invention one;
Fig. 4 is the schematic representation of compressor variable frequency process in the embodiment of the invention one;
Fig. 5 is the control gear schematic representation of frequency-changeable compressor in the embodiment of the invention two;
Fig. 6 is the flow chart of the controlling method of frequency-changeable compressor in the embodiment of the invention two;
Fig. 7 is the schematic representation of compressor variable frequency process in the embodiment of the invention two
Fig. 8 is the control gear schematic representation of frequency-changeable compressor in the embodiment of the invention three;
Fig. 9 is the flow chart of the controlling method of frequency-changeable compressor in the embodiment of the invention three.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization under the situation of intension of the present invention.Therefore the present invention is not subjected to the restriction of following public concrete enforcement.
Described schematic representation is an example, and it should not limit the scope of protection of the invention at this.
At present, the magnetic suspension centrifugal compressor receives the concern of air-conditioning, refrigeration industry day by day, the bearing of this compressor centrifugal turbine adopts magnetic suspension bearing, because there is not the friction between metal and the metal in magnetic bearing, therefore need not lubricating oil system, thereby solved noise and the lubricated long-term puzzlement technical problem in the industry that waits, adopted its load efficient of magnetic suspension centrifugal compressor of VFC to improve a lot.Among following several embodiments, will be the controlling method that background is set forth frequency-changeable compressor of the present invention with the centrifugal central air-conditioner unit of magnetic suspension.
Embodiment one
Present embodiment discloses a kind of embodiment of the controlling method of frequency-changeable compressor of the present invention in conjunction with Fig. 2, Fig. 3 and Fig. 4.
Fig. 2 is the control gear schematic representation of frequency-changeable compressor in the present embodiment, and Fig. 3 is the flow chart of the controlling method of frequency-changeable compressor in the present embodiment, and Fig. 4 is the schematic representation of compressor variable frequency process in the present embodiment.
The used refrigeration agent of the centrifugal central air-conditioner unit of frequency conversion magnetic levitation is a refrigeration industry refrigerant commonly used, cold carrying agent is water or other fluid, unit turns cold cold carrying agent earlier by compression refrigerant, allow cold carrying agent reduce room temperature then in indoor circulation, it for example is cold carrying agent with water, with reference to shown in Figure 2, described frequency-changeable compressor control gear comprises: sensor 10, controller 20 and frequency variator 30; Sensor 10 is monitored water-exit temperature in real time in the unit, the variation of pid parameter control frequency is set or adjusted to controller 20 relatively in the back according to the target temperature of true temperature that records and setting, and frequency variator 30 is used for changing the compressor operating frequency under the control of controller 20.
As shown in Figure 3, the target setting temperature is 0 ℃; According to step 201, be arranged on the sensor 10 monitoring actual temperature value of water outlet, obtain the difference of true temperature and target temperature, for example to monitor current actual water-exit temperature be 30 ℃ to sensor 10, then the difference DELTA T of true temperature and target temperature is 30 ℃.
Judge according to step 202 whether the temperature difference of true temperature and target temperature is zero, if promptly true temperature is consistent with target temperature, does not then start compressor, continues the monitoring true temperature then; If not, then starting compressor according to step 203 controller 20 moves with lowest frequency; For example temperature difference Δ T be 30 ℃ greater than zero, then controller 20 control compressor starts start, and with minimum frequency operation a period of time, so that compressor enters steady state, prevent to start suddenly high frequency operation causing compressor fault.
After step 204 lowest frequency operation certain hour, controller 20 obtains current actual temperature from sensor, judges whether the temperature difference of current actual temperature and target temperature is zero, if, show to reach required target temperature, then stop compressor operating, as step 205; If not, then give the pid parameter initialize with reference to step 206 controller 20, frequency variator 30 control compressor starts raising frequency operations, the speed of the incipient stage of raising frequency is bigger, so that obtain very big refrigerating capacity fast.For example behind the compressor lowest frequency operation certain hour, true temperature is reduced to 27 ℃ by 30 ℃, 0 ℃ of miss the mark temperature, then give the pid parameter initialize, beginning is with bigger speed raising frequency, frequency change is shown in curve EF among Fig. 4, and compressor rises to higher frequency fast, reaches bigger refrigerating capacity.
After bigger speed raising frequency a period of time, with reference to step 207, judge whether to arrive the segmentation temperature spots of setting, if, then adjust pid parameter, compressor is moved, shown in step 208 with different raising frequency speed raising frequencies; If not, then keep original pid parameter, shown in step 209.For example preestablish four sections raising frequencies of branch, three segmentation temperature spots T1, T2, T3 are respectively 23 ℃, 15 ℃, 3 ℃, sensor monitors is reduced to 23 ℃ to true temperature, reach the segmentation temperature spots T1 of setting, then controller 20 is adjusted pid parameters at this moment, frequency variator 30 reduces the raising frequency speed of compressor, and frequency change is shown in curve FG among Fig. 4; When sensor monitors is reduced to 15 ℃ to true temperature, reach segmentation temperature spots T2, this moment, controller 20 was adjusted pid parameter once more, and frequency variator 30 reduces the raising frequency speed of compressor once more, and frequency change is shown in curve GH among Fig. 4, and the frequency change trend steadily; Increase gradually facing to refrigerating capacity, true temperature is reduced to 3 ℃, reach the segmentation temperature spots T3 of setting, controller 20 is adjusted pid parameter once more, frequency change is shown in curve HM among Fig. 4, control frequency variator 30 further reduces compressor raising frequency speed, and milder increase refrigerating capacity is near target temperature.
With reference to step 210, controller judges whether to reach target temperature according to the true temperature of sensor 10 monitorings, if then as step 212, compressor moves with fixed frequency, frequency conversion finishes; If not,, keep original pid parameter to make the fixing speed raising frequency of compressor, return step 207 then then as step 211.For example to monitor true temperature be 0 ℃ to sensor 10, reaches target temperature, and frequency variator 30 stops frequency conversion, and compressor moves with fixed frequency.
In the present embodiment, be that boundary has been divided into four-stage with the raising frequency process with the temperature spots, thereby each stage all change the speed that pid parameter is adjusted frequency conversion; As the EF stage among Fig. 4, begin raising frequency with bigger speed, obtain bigger refrigerating capacity fast, the rate of temperature change of this moment is also bigger, when true temperature arrives 23 ℃ of segmentation temperature spotss then, adjusts pid parameter, reduce the speed of raising frequency, as the FG stage among Fig. 4, the refrigerating capacity speedup is also corresponding to slow down, and true temperature continues to reduce; When true temperature arrives 15 ℃ of next segmentation temperature spotss, adjust pid parameter, raising frequency speed is further reduced, as the GH stage among Fig. 4, the speedup of refrigerating capacity also further reduces, the temperature variation trend slowly, thereby stably near target; As the HM stage among Fig. 4, true temperature reaches 3 ℃ of segmentation temperature spotss, near target temperature, adjusts pid parameter and makes raising frequency speed trend towards zero, slowly press close to temperature required, thereby prevent overshoot, avoided frequent lifting frequency.Dash area is represented the integral area of curve EFGHM among Fig. 4, the energy consumption in the corresponding conversion process, and as seen with respect to method for controlling frequency conversion of the prior art among Fig. 1, integral area is littler, and is more energy-conservation.
The described frequency-changeable compressor controlling method of present embodiment, with respect to several method for controlling frequency conversion of the prior art, conversion process is sectional-regulated, begin quick raising frequency, improve refrigerating efficiency, progressively reduce raising frequency speed subsequently, slowly, prevent overshoot, avoided frequent lifting frequency near target temperature, shorten cooling time on the whole, also saved the energy.
In embodiment's one raising frequency process, increase along with compressor frequency, refrigerating capacity also constantly increases, temperature reduces fast, if rate of temperature change is excessive, make the machine set system pressure of inspiration(Pi) cross low or exhaust pressure too high, may cause the unit fault, for avoiding this type of situation to take place, guarantee that the air-conditioning unit is stable, frequency-changeable compressor controlling method of the present invention also comprises setting temperature variance ratio limit value, and controller is adjusted pid parameter according to the actual temperature change rate definite value that whether transfinites, and specifically sets forth in following examples.
Embodiment two
Present embodiment 5-Fig. 7 has in conjunction with the accompanying drawings disclosed another embodiment of described frequency-changeable compressor controlling method.Be with embodiment one difference: after pid parameter was adjusted in segmentation, whether the real-time detected temperatures variance ratio of controller surpassed limit value, if, then give the pid parameter assignment again, be lower than limit value up to rate of temperature change.
Fig. 5 is the control gear schematic representation of frequency-changeable compressor in the present embodiment, and Fig. 6 is the flow chart of the controlling method of frequency-changeable compressor in the present embodiment, and Fig. 7 is the schematic representation of compressor variable frequency process in the present embodiment.
With reference to shown in Figure 5, described frequency-changeable compressor control gear comprises: sensor 11, controller 21 and frequency variator 31; Sensor 11 is monitored water-exit temperature in real time in the unit, the variation of pid parameter control frequency is set or adjusted to controller 21 relatively in the back according to the target temperature of true temperature that records and setting, controller 21 also is used to monitor real-time rate of temperature change, and judge whether actual rate of temperature change surpasses limit value, if, then adjust pid parameter rate of temperature change is reduced, frequency variator 31 is used for changing the compressor operating frequency under the control of controller 21.
As shown in Figure 6, the target setting temperature is 0 ℃, preestablishes five sections raising frequencies of branch, and four segmentation temperature spots T1, T2, T3, T4 are respectively 20 ℃, 13 ℃, 7 ℃, 3 ℃; According to step 301, be arranged on the sensor 11 monitoring actual temperature value of water outlet, obtain the difference of true temperature and target temperature, for example to monitor current actual water-exit temperature be 30 ℃ to sensor 11, then the difference DELTA T of true temperature and target temperature is 30 ℃.
Judge according to step 302 whether the temperature difference of true temperature and target temperature is zero, if promptly true temperature is consistent with target temperature, does not then start compressor, continues the monitoring true temperature then; If not, show that needs start compressor cooling, then start compressor and move a period of time with lowest frequency according to step 303 controller 21; For example temperature difference Δ T be 30 ℃ greater than zero, then controller 21 begins to start compressor, and with minimum frequency operation a period of time, so that compressor enters steady state, prevents to start suddenly high frequency operation causing compressor fault.
Similar to embodiment one, compressor is with after the lowest frequency operation certain hour, and controller 21 obtains current actual temperature from sensor, whether the temperature difference of judging current actual temperature and target temperature is zero, if, show to reach required target temperature, then stop compressor operating; If not, showing still needs to increase refrigerating capacity, and then controller 21 is given the pid parameter initialize, frequency variator 31 control compressor starts raising frequency operations, and the speed of the incipient stage of raising frequency is bigger, so that obtain very big refrigerating capacity fast.For example behind the compressor lowest frequency operation certain hour, true temperature is reduced to 27 ℃ by 30 ℃, 0 ℃ of miss the mark temperature, then give the pid parameter initialize, beginning is with bigger speed raising frequency, frequency change is shown in curve E ' F ' among Fig. 7, and compressor rises to higher frequency fast, reaches bigger refrigerating capacity.
After bigger speed raising frequency a period of time, with reference to step 304, judge whether to arrive the segmentation temperature spots of setting, if, then shown in step 306, adjust pid parameter, make compressor with the operation of different raising frequency speed substep raising frequency; If not, then keep original pid parameter, shown in step 305.For example sensor monitors is reduced to 20 ℃ to true temperature by 27 ℃, reaches the segmentation temperature spots T1 of setting, and controller 21 is adjusted pid parameters at this moment, and then frequency variator 31 reduces the raising frequency speed of compressor, and frequency change is shown in curve F ' G ' among Fig. 7; Sensor 11 monitors true temperature when reducing to 13 ℃, reach segmentation temperature spots T2, this moment, controller 21 was adjusted pid parameter once more, and frequency variator 31 reduces the raising frequency speed of compressor once more, frequency change is shown in curve G ' H ' among Fig. 7, and the frequency change trend steadily; Increase gradually facing to refrigerating capacity, true temperature is reduced to 7 ℃, reach the segmentation temperature spots T3 of setting, controller 21 is adjusted pid parameter once more, frequency change is shown in curve H ' M ' among Fig. 7, control frequency variator 31 further reduces compressor raising frequency speed, and milder increase refrigerating capacity is near target temperature; Last true temperature is reduced to 3 ℃, and very near target temperature, at this segmentation temperature spots T4, controller changes pid parameter reduces raising frequency speed as far as possible, and refrigerating capacity slowly increases, and presses close to target temperature gradually, effectively prevents overshoot.
With reference to step 307, the real-time rate of temperature change of controller 21 monitorings, behind each adjustment pid parameter, if rate of temperature change exceeds predefined limit value, for avoiding the machine set system fault, then return step 306 controller 21 and readjust pid parameter, and then whether monitor real-time rate of temperature change above limit value, normal up to rate of temperature change, to guarantee the stable operation of air-conditioning unit.
If rate of temperature change did not exceed limit value after controller was adjusted pid parameter, then according to step 308, judge whether to reach target temperature, if then according to step 310, compressor moves with fixed frequency, frequency conversion finishes; If not,, keep original pid parameter to make the fixing speed raising frequency of compressor, return step 304 then then according to step 309.For example to monitor true temperature be 0 ℃ to sensor 11, reaches target temperature, and frequency variator 31 stops frequency conversion, and compressor moves with fixed frequency.
In the present embodiment, be that boundary has been divided into five stages with the raising frequency process with the temperature spots, thereby each stage all change the speed that pid parameter is adjusted frequency conversion; As the E ' F ' stage among Fig. 7, begin raising frequency with bigger speed, obtain bigger refrigerating capacity fast, the rate of temperature change of this moment is also bigger, when true temperature arrives 20 ℃ of segmentation temperature spotss then, adjusts pid parameter, reduce the speed of raising frequency, as the F ' G ' stage among Fig. 7, the refrigerating capacity speedup is also corresponding to slow down, and true temperature continues to reduce; When true temperature arrives 13 ℃ of next segmentation temperature spotss, adjust pid parameter, raising frequency speed is further reduced, as the G ' H ' stage among Fig. 7, the speedup of refrigerating capacity also further reduces, the temperature variation trend slowly, thereby stably near target; As the H ' M ' stage among Fig. 7, true temperature reaches 7 ℃ of segmentation temperature spotss, near target temperature, adjusts pid parameter and makes raising frequency speed continue to reduce, and slowly presses close to temperature required; Last true temperature reaches 7 ℃ of segmentation temperature spotss, and it is minimum that the adjustment pid parameter is reduced to raising frequency speed, as the M ' N ' stage among Fig. 7, thereby prevents overshoot, avoided frequent lifting frequency.Dash area is represented the integral area of curve E ' F ' G ' H ' M ' N ' among Fig. 7, the energy consumption in the corresponding conversion process, and as seen with respect to method for controlling frequency conversion of the prior art among Fig. 1, integral area is littler, and is more energy-conservation.
The described frequency-changeable compressor controlling method of present embodiment with respect to several method for controlling frequency conversion of the prior art, with the sectional-regulated refrigerating efficiency that improved of conversion process, has been avoided frequent lifting frequency, has also saved the energy; Further, the real-time monitoring temperature variance ratio of controller has prevented that effectively rate of temperature change from exceeding limit value, but guarantees the stability of system's operation.
In addition; compare with embodiment one; present embodiment is divided into five sections raising frequency processes equally also can realize quick, energy-conservation and stable conversion process; those skilled in the art should be easy to know by inference; the raising frequency process that is divided into more than at least three sections and three sections all can realize purpose of the present invention, also belongs to protection scope of the present invention.
Frequency-changeable compressor controlling method of the present invention and device can also make the compressor frequency reducing reduce refrigerating capacity by pid regulator parameters, cause the unit low-temperature protection in order to avoid water-exit temperature is low excessively, specifically set forth in following examples.
Embodiment three
Present embodiment in conjunction with the accompanying drawings 8 and Fig. 9 disclose the another kind of mode of execution of described frequency-changeable compressor controlling method.In process of refrigerastion, if true temperature is lower than target temperature, promptly true temperature is with respect to target temperature overshoot, and described frequency-changeable compressor controlling method of present embodiment and device begin the frequency reducing adjustment process then by judging whether overshoot.
Fig. 8 is the control gear schematic representation of frequency-changeable compressor in the present embodiment, and Fig. 9 is the flow chart of the controlling method of frequency-changeable compressor in the present embodiment.
With reference to shown in Figure 8, the control gear of described frequency-changeable compressor comprises: sensor 12, controller 22 and frequency variator 32; Wherein, sensor 12 is used for monitoring in real time water-exit temperature, controller 22 is used for relatively setting or adjust the variation of pid parameter control frequency in the back according to the target temperature of true temperature that records and setting, also be used to monitor true temperature and whether be lower than target temperature, if, show frequency overshoot, then carrying out frequency reducing regulates, if not, then compressor moves with fixed frequency, frequency conversion finishes, and compressor moves with fixed frequency, and frequency variator 32 is used for changing the frequency of compressor operating under the control of controller 22.
As shown in Figure 9, the raising frequency process finishes the back compressor to be moved with fixed frequency, as step 401; The actual water-exit temperature of sensor 22 monitorings, judge according to step 402 controller 32 whether true temperature is lower than target temperature, if, show that refrigerating capacity is excessive, then shown in step 403, give the pid parameter assignment again, frequency variator 32 beginning frequency reducings, if not, then compressor continues to move with fixed frequency; Whether the difference of judging true temperature and target temperature according to step 404 controller 22 surpasses default limit value, if, then shown in step 406, adjust the quick frequency reducing of pid parameter, reduce refrigerating capacity rapidly, cause the unit low-temperature protection in order to avoid water-exit temperature is crossed low, thereby guarantee the stable operation of air-conditioning unit; If do not surpass default limit value, then shown in step 405, keep pid parameter constant, with fixing speed frequency reducing.
In the present embodiment; whether controller surpasses limit value by the difference of judging true temperature and target temperature; adjust pid parameter then; frequency variator changes the speed of frequency reducing; thereby realized stable control to the frequency reducing process; avoid water-exit temperature to cross low and caused the unit low-temperature protection, guaranteed the stability of air-conditioning unit operation.
Among above-mentioned several embodiment, be that background discloses technological scheme of the present invention all with the centrifugal central air-conditioner unit of magnetic suspension, in fact, the controlling method of frequency-changeable compressor of the present invention and device are not limited by its application area, and other use the refrigeration of frequency-changeable compressor, the purpose that heating also can realize method of the present invention.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (8)
1, a kind of controlling method of frequency-changeable compressor is characterized in that, preestablishes target temperature and segmentation temperature spots, the sensor monitors actual temperature value, and described method comprises:
Steps A: controller judges whether the temperature difference of true temperature and target temperature is zero, and if not, compressor moves certain hour with low-limit frequency;
Step B: controller judges whether to reach target temperature, if then stop compressor operating; If not, then controller is given the pid parameter initialize, and frequency variator makes the quick raising frequency of compressor starts;
Step C: controller judges whether to arrive the segmentation temperature spots of setting, if, then adjust pid parameter, enter step D then; If not, keep original pid parameter;
Step D: controller judges whether to reach target temperature, if then compressor moves with fixed frequency, frequency conversion finishes; If not, then keep original pid parameter to make the compressor raising frequency, return step C.
2, the controlling method of frequency-changeable compressor according to claim 1 is characterized in that, the segmentation temperature spots that is used to judge among the described step C is set three at least.
3, the controlling method of frequency-changeable compressor according to claim 1 and 2, it is characterized in that, setting temperature variance ratio limit value, also comprise step M between described step C and the step D: controller judges whether rate of temperature change surpasses limit value, if then adjust pid parameter rate of temperature change reduced; If not, then enter step D.
4, the controlling method of frequency-changeable compressor according to claim 1 and 2 is characterized in that, also comprises step e after the described step D: judge that true temperature is with respect to whether overshoot of target temperature, if then carry out the frequency reducing adjusting.
5, the controlling method of frequency-changeable compressor according to claim 4, it is characterized in that, set overshoot temperature difference limit value, carrying out the frequency reducing adjusting in the described step e comprises: start frequency reducing for the pid parameter assignment, whether the temperature difference of judging overshoot surpasses described overshoot temperature difference limit value, if not, then fixing pid parameter is constant; If then adjust the quick frequency reducing of pid parameter.
6, a kind of control gear of frequency-changeable compressor is characterized in that, comprising: sensor, controller and frequency variator;
Described sensor is used to monitor the true temperature of year cold/thermit powder and the temperature that records is sent to controller;
Described controller, the temperature difference that is used for the true temperature that records according to sensor and target temperature is set and is changed pid parameter and carries out frequency change control;
Described frequency variator is used for changing the compressor operating frequency under the control of controller.
7, the control gear of frequency-changeable compressor according to claim 6 is characterized in that: described controller is used to also judge whether actual rate of temperature change surpasses limit value, if then adjust pid parameter rate of temperature change is reduced.
8, the control gear of frequency-changeable compressor according to claim 6 is characterized in that: described controller also is used to judge true temperature with respect to whether overshoot of target temperature, if then carry out frequency reducing and regulate.
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| CN102052734A (en) * | 2009-11-03 | 2011-05-11 | 海尔集团公司 | Air conditioning unit energy control device and method |
| CN102331072A (en) * | 2011-09-20 | 2012-01-25 | 广东美的电器股份有限公司 | Energy-saving control method for air conditioner with double-mode double-rotor variable frequency compressor |
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| CN115079562A (en) * | 2022-07-20 | 2022-09-20 | 中国飞机强度研究所 | Determination method of temperature change control method for testing thermal strength of aerospace plane |
| CN115079562B (en) * | 2022-07-20 | 2022-11-01 | 中国飞机强度研究所 | Determination method of temperature change control method for testing thermal strength of aerospace plane |
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