CN102032139B - System and method for adjusting energy of magnetic suspension compressor - Google Patents
System and method for adjusting energy of magnetic suspension compressor Download PDFInfo
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- CN102032139B CN102032139B CN201010578640.2A CN201010578640A CN102032139B CN 102032139 B CN102032139 B CN 102032139B CN 201010578640 A CN201010578640 A CN 201010578640A CN 102032139 B CN102032139 B CN 102032139B
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Abstract
The invention discloses a system and a method for adjusting energy of a magnetic suspension compressor. The system comprises a start unit for starting the compressor, a calculation unit for calculating the load requirement R of a compressor unit comprising a plurality of compressors, a comparison unit for comparing a current load R1 of the compressor unit with the calculated load requirement R, and a determining distribution unit for halting a started compressor, or starting a new compressor or distributing load for a started compressor according to the comparison result of the comparison unit. The method comprises the following steps: starting the compressor; calculating the load requirement R of the compressor unit comprising a plurality of compressors; comparing the current load R1 of the compressor unit with the calculated load requirement R; and halting a started compressor, or starting a new compressor or distributing load for the started compressor according to the comparison result of the comparison unit. According to the system and the method, overstrike generated by only determining the current load rather than determining the refrigeration capability can be avoided.
Description
Technical field
The present invention relates to a kind of refrigeration compressor, particularly a kind of system and method for adjusting energy of magnetic suspension compressor.
Background technique
At present, in refrigeration compressor, extensively adopt magnetic levitation refrigeration compressor, for example, disclosed in Chinese patent notice of authorization CN201502503U.Magnetic levitation refrigeration compressor adopts magnetic suspension stent support, and between rotor and support, because magnetic force does not have physical contact each other, the rotation of rotor is without any mechanical friction, thereby reduced energy consumption, improve the performance of motor, not only improved efficiency, also further saved energy.
It is the energy adjustment control mode that central air-conditioning system generally adopts that PID controls, because its stability to unit regulating and controlling is high, simultaneously can with time faster, reach the setting temperature of unit, realize stable operation of unit, constant-temperature effluent, and promoted widely.
Current water-cooling screw rod and centrifuge, magnetic suspension unit major part all adopts pid algorithm to realize the energy adjustment of unit.To reach stable, control energy-optimised object.
Yet, in magnetic suspension compressor start, be accomplished in the adjustment process of stable operation, especially during multiple pressure machine combined running, the control of this part is difficult to the control effect that reaches best, the actual load that the distribution load that compressor is current and compressor are current, tends to because the hysteresis of compressor slide valve puts in place and produces gap.The workload demand that PID (energy method computations) calculates normally contrasts with the load of the current distribution of compressor, and seldom the actual load of considering compression machine, can produce wrong workload demand thus, causes compressor overshoot.
Summary of the invention
For the one or more problems that exist in correlation technique, the object of the present invention is to provide a kind of system and method for adjusting energy of magnetic suspension compressor, to contrast by compressor distribution load and the corresponding compressor capacity of compressor current, thereby, according to current range, judge whether compressor actual load reaches distribution load, further to confirm the reallocation of workload demand and load, thereby control compressor stable regulation, avoid compressor to occur over control, realize the stable operation of constant-temperature effluent and unit faster.
For achieving the above object, according to an aspect of the present invention, provide a kind of system for adjusting energy of magnetic suspension compressor, this system comprises: start unit, for starting compressor; Computing unit, for calculating the workload demand R of the Compressor Group that comprises a plurality of compressors; Comparing unit, compares the preload R1 that works as of Compressor Group with calculated workload demand R; Judgement allocation units, according to the comparative result of comparing unit, stop the compressor starting or start new compressor or the compressor having started is carried out to load distribution.
Preferably, judgement allocation units comprise: the first judgement Unload module, if R < is R1, judge the compressor that whether has minimum load in Compressor Group, if existence, the compressor shutdown of this minimum load, if there is the compressor of many minimum loads,, by the compressor shutdown of the longest this minimum load working time, if there is no the compressor of minimum load, selects compressor to unload; The second judgement distribution module, if R > is R1, judge that whether Compressor Group is in moving under preload R1, if moving, judge the whether whole full load operation of compressor in Compressor Group under preload, if not at full capacity, to the compressor loads having started, if the whole oeprations at full load of compressor unload the compressor having started, and start next compressor, the compressor of firm startup is loaded; If not moving, proceed this judgement, until compressor is in operation under preload under preload.
Preferably, this system also comprises the first comparison module, for comparison object water temperature and start-up temperature with value and actual water temperature, to judge whether to start compressor, wherein, start-up temperature is setting value.
Preferably, this system also comprises startup judgement time delay module, for judging whether to reach, starts judgement time delay, if reached, starts compressor, if do not reached, continues to judge whether to reach startup time delay, until reach.
Preferably, this system also comprises timer, has the compressor of minimum load in the first judgement Unload module judgement, starts timer, after setting value, stops the compressor of this minimum load.
According to a further aspect in the invention, also provide a kind of method for adjusting energy of magnetic suspension compressor, the method comprises: start compressor; Calculating comprises the workload demand R of the Compressor Group of a plurality of compressors; The preload R1 that works as of Compressor Group is compared with calculated workload demand R; And according to result relatively, stop the compressor starting or start new compressor or the compressor having started is carried out to load distribution.
Preferably, according to result relatively, stop the compressor starting or start new compressor or the method that the compressor having started carries out load distribution is comprised: if R < is R1, judge the compressor that whether has minimum load in Compressor Group, if existed, the compressor shutdown of this minimum load, if there is the compressor of many minimum loads, by the compressor shutdown of the longest this minimum load working time, if there is no the compressor of minimum load, selects compressor to unload; If R > is R1, judge that whether Compressor Group is in moving under preload R1, if moving under preload, judge the whether whole full load operation of compressor in Compressor Group, if not at full capacity, to the compressor loads having started, if the whole oeprations at full load of compressor, the compressor having started is unloaded, and start next compressor, the compressor of firm startup is loaded; If not moving, proceed this judgement, until compressor is in operation under preload under preload.
Preferably, the method also comprises: before starting compressor, and comparison object water temperature and start the temperature difference and size value and actual water temperature, wherein, start-up temperature is setting value.
Preferably, the method also comprises: judge whether to reach startup time delay, if reached, start compressor, if do not reached, continue to judge whether to reach startup time delay, until reach.
Preferably, if the whole oeprations at full load of compressor, unload the compressor having started, and start next compressor, the method that the compressor of firm startup is loaded comprises: start after next compressor, workload demand is all given to started compressor.
According to the present invention, by the contrast when the preload compressor capacity corresponding with compressor current, judge whether compressor is really in the current given load stage, realizes corresponding refrigerating capacity, thereby avoided only judging the overshoot that does not judge refrigerating capacity when preload and produce.Meanwhile, before subsequent compression machine starts, reduce and started the load of compressor, thereby avoid, after subsequent compression machine starts, unit capacity significantly rises, and the over control producing.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is according to an embodiment of the invention for the schematic flow diagram of the method for adjusting energy of magnetic suspension compressor;
Fig. 2 is the flow chart of the energy adjustment method in start process according to an embodiment of the invention; And
Fig. 3 is the flow chart that subsequent compression machine starts according to an embodiment of the invention.
Embodiment
Consider the problem existing in correlation technique, the invention provides a kind of system and method for adjusting energy of magnetic suspension compressor.Describe embodiments of the invention below in detail, described embodiment's example is shown in the drawings.Should be understood that below by the embodiment who is described with reference to the drawings be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
Fig. 1 is according to an embodiment of the invention for the schematic flow diagram of the method for adjusting energy of magnetic suspension compressor.As shown in Figure 1, by the first comparison module comparison object water temperature and start-up temperature (being setting value) and value (that is, target water temperature+start-up temperature) and actual water temperature, to judge whether to need start, if through judgement, confirm start, thereby start compressor.Then, computing unit calculates the workload demand R of Compressor Group by PID.Comparing unit is by comparing the preload R1 that works as of Compressor Group with calculated workload demand R.Finally, judgement allocation units, according to the comparative structure of comparing unit, stop the compressor starting or start new compressor or the compressor having started is carried out to load distribution.The operation of above-mentioned judgement allocation units is specially: if R < is R1, first judges that Unload module judges the compressor that whether has minimum load in Compressor Group, if existed, the compressor shutdown of this minimum load, if there is the compressor of many minimum loads,, by the compressor shutdown of the longest this minimum load working time, if there is no the compressor of minimum load, selects compressor to unload; If R > is R1, second judges that distribution module judges that whether Compressor Group is in moving under preload R1, if moving under preload, judge the whether whole full load operation of compressor in Compressor Group, if not at full capacity, to the compressor loads having started, if the whole oeprations at full load of compressor, the compressor having started is unloaded, and start next compressor, the compressor of firm startup is loaded; If not moving, proceed this judgement, until compressor is in operation under preload under preload.
Before the method for adjusting energy of magnetic suspension compressor has according to an embodiment of the invention been described.After N compressor start operation, by PID, calculate output load demand R.Startup decision condition to N+1 compressor, and before and after starting, all compressors can regulation and control system, adopting rear liter first falls and can tune mode, the decline of control unit stable water outlet, avoids overshoot.Take N+1 compressor as example, the energy adjustment method in start process is described, as shown in Figure 2, it shows the startup flow chart of First compressor.As shown in Figure 2, according to contrasting with value of actual water temperature and target water temperature and the startup temperature difference, judge whether to need start, startup judgement time delay through in program, starts First compressor, by detecting the feedback signal of compressor computer board, judgement compressor is accepted start-up command, at the state of compressor, reach after the state that acquiescence started, by PID, calculate, draw the workload demand R of unit.The size as preload R1 and demand load R that compares compressor, if R < is R1, judge whether compressor is in minimum load, if, for example, after setting value in timer (4 minutes), compressor shutdown, if not, write direct load R to compressor (that is, compressor being unloaded); If R > is R1, relatively load and the corresponding compressor capacity of current electric current of compressor, judge whether compressor reaches current load R1 operation, if moving under preload, judge whether full load operation of compressor, if full load operation starts next compressor, if compressor is not fully loaded, write load R to compressor (this compressor being loaded); If not moving, proceed this judgement, until compressor is in operation under preload under preload.
Suppose the operation of having started shooting of N compressor, by the flow chart shown in Fig. 3, describe the running state of N+1 compressor.As shown in Figure 3, first judge whether current unit energy meets workload demand, namely more current Compressor Group as preload R1 and workload demand R, if when current unit energy meets workload demand, continue to carry out this judgement; In the time can not meeting workload demand, the whether whole oeprations at full load of the N compressor that judgement has been opened, if not at full capacity, the compressor having started is loaded, if all oeprations at full load, workload demand is all given to N+1 compressor, separately to the former N compressor unloading having started, issue start-up command to N+1 compressor simultaneously, by detecting the feedback signal of compressor computer board, judgement compressor is accepted start-up command, after reaching the state that started of acquiescence, N+1 compressor is carried out to load distribution.Thereby the energy adjustment that realizes unit is controlled.
According to the present invention, by the contrast when the preload compressor capacity corresponding with compressor current, judge whether compressor is really in the current given load stage, realizes corresponding refrigerating capacity, thereby avoided only judging the overshoot that does not judge refrigerating capacity when preload and produce.Meanwhile, before subsequent compression machine starts, reduce and started the load of compressor, thereby avoid, after subsequent compression machine starts, unit capacity significantly rises, and the over control producing.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiments, scope of the present invention is by claims and be equal to and limit.
Claims (8)
1. for a system for adjusting energy of magnetic suspension compressor, it is characterized in that, described system comprises:
Start unit, for starting compressor;
Computing unit, for calculating the workload demand R of the Compressor Group that comprises a plurality of compressors;
Comparing unit, compares the preload R1 that works as of Compressor Group with calculated workload demand R;
Judgement allocation units, according to the comparative result of comparing unit, stop the compressor starting or start new compressor or the compressor having started is carried out to load distribution;
Wherein, described judgement allocation units comprise:
The first judgement Unload module, if R<R1, judge the compressor that whether has minimum load in Compressor Group, if existed, the compressor shutdown of this minimum load, if there is the compressor of many minimum loads, by the compressor shutdown of the longest this minimum load working time, if there is no the compressor of minimum load, selects compressor to unload;
The second judgement distribution module, if R>R1, judge that whether Compressor Group is in moving under preload R1, if moving, judge the whether whole full load operation of compressor in Compressor Group under preload, if not at full capacity, to the compressor loads having started, if the whole oeprations at full load of compressor unload the compressor having started, and start next compressor, the compressor of firm startup is loaded; If not moving, proceed this judgement, until compressor is in operation under preload under preload.
2. system according to claim 1, is characterized in that, described system also comprises the first comparison module, for comparison object water temperature and start-up temperature with value and actual water temperature, to judge whether to start compressor, wherein, start-up temperature is setting value.
3. system according to claim 1, is characterized in that, described system also comprises startup judgement time delay module, be used for judging whether to reach starting judgement time delay, if reached, start compressor, if do not reached, continue to judge whether to reach startup time delay, until reach.
4. system according to claim 1, is characterized in that, described system also comprises timer, has the compressor of minimum load in the first judgement Unload module judgement, starts timer, after setting value, stops the compressor of this minimum load.
5. for a method for adjusting energy of magnetic suspension compressor, it is characterized in that, described method comprises:
Start compressor;
Calculating comprises the workload demand R of the Compressor Group of a plurality of compressors;
The preload R1 that works as of Compressor Group is compared with calculated workload demand R; And
According to result relatively, stop the compressor starting or start new compressor or the compressor having started is carried out to load distribution;
Wherein, according to result relatively, stop the compressor starting or start new compressor or the compressor having started is carried out to load distribution comprising: if R<R1, judge the compressor that whether has minimum load in Compressor Group, if existed, the compressor shutdown of this minimum load, if there is the compressor of many minimum loads, by the compressor shutdown of the longest this minimum load working time, if there is no the compressor of minimum load, selects compressor to unload; If R>R1, judge that whether Compressor Group is in moving under preload R1, if moving under preload, judge the whether whole full load operation of compressor in Compressor Group, if not at full capacity, to the compressor loads having started, if the whole oeprations at full load of compressor, the compressor having started is unloaded, and start next compressor, the compressor of firm startup is loaded; If not moving, proceed this judgement, until compressor is in operation under preload under preload.
6. method according to claim 5, is characterized in that, described method also comprises: before starting compressor, and comparison object water temperature and start-up temperature and size value and actual water temperature, wherein, start-up temperature is setting value.
7. method according to claim 5, is characterized in that, described method also comprises: judge whether to reach startup time delay, if reached, start compressor, if do not reached, continue to judge whether to reach startup time delay, until reach.
8. method according to claim 5, it is characterized in that, if the whole oeprations at full load of compressor, the compressor having started is unloaded, and start next compressor, the compressor of firm startup is loaded and comprised: start after next compressor, workload demand is all given to started compressor.
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| CN201010578640.2A CN102032139B (en) | 2010-12-08 | 2010-12-08 | System and method for adjusting energy of magnetic suspension compressor |
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| CN201010578640.2A CN102032139B (en) | 2010-12-08 | 2010-12-08 | System and method for adjusting energy of magnetic suspension compressor |
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| CN102032139B true CN102032139B (en) | 2014-03-12 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620383B (en) * | 2012-04-09 | 2015-03-11 | 青岛海尔空调电子有限公司 | Control method and device of air-conditioning equipment and air conditioning system |
| CN103233893B (en) * | 2013-04-26 | 2015-09-02 | 青岛奥利凯中央空调有限公司 | Multi-machine heads screw compressor capacity adjustment control method |
| CN106352493B (en) * | 2016-10-10 | 2019-01-11 | 珠海格力电器股份有限公司 | Compressor of air conditioner Smaller load runs start-up and shut-down control method, compressor of air conditioner and air conditioner |
| CN107655244B (en) * | 2017-07-31 | 2021-11-02 | 青岛海尔空调电子有限公司 | Control method of magnetic suspension centrifugal air conditioning unit |
| CN107829969B (en) * | 2017-07-31 | 2020-12-08 | 青岛海尔空调电子有限公司 | Anti-surge control method and system for magnetic suspension centrifugal air conditioning unit |
| CN110906477B (en) * | 2019-11-07 | 2021-07-13 | 广东申菱环境系统股份有限公司 | Efficient and stable magnetic suspension water chilling unit, control method and device |
| CN112254308B (en) * | 2020-10-22 | 2021-08-20 | 珠海格力电器股份有限公司 | Modularized air conditioning unit and compressor control method thereof |
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