CN106269310A - Surge controlling method and system - Google Patents
Surge controlling method and system Download PDFInfo
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- CN106269310A CN106269310A CN201610860217.9A CN201610860217A CN106269310A CN 106269310 A CN106269310 A CN 106269310A CN 201610860217 A CN201610860217 A CN 201610860217A CN 106269310 A CN106269310 A CN 106269310A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
Abstract
The invention provides a kind of surge controlling method, comprise the steps: to obtain compressor running state parameter under current working；Judge whether described compressor occurs surge according to compressor running state parameter under current working；Running state parameter during recording compressed machine generation surge, it is thus achieved that surging condition parameter；Adjusting the running frequency of compressor to target frequency, described compressor stops surge at described target frequency；Record the running state parameter corresponding with described target frequency, it is thus achieved that dbjective state parameter；According to surging condition parameter and/or the current surge curve of dbjective state parameters revision, it is thus achieved that target surge curve；The running status of described compressor is controlled according to target surge curve.Present invention also offers a kind of surge control system.The surge controlling method of the present invention and system, improve accuracy and reliability that compressor surge controls, solve the problems such as the compressor caused due to surge cannot unload.
Description
Technical field
The present invention relates to Centrifuge Techniques field, particularly relate to a kind of surge controlling method and system.
Background technology
Centrifuge easily occurs the phenomenon of compressor surge in running, and surge line can be according to condensing pressure, steaming
Send out pressure, the conversion of entry guide vane aperture and change.For avoiding the generation of surge phenomenon, by needing the frequency limit of compressor
System is more than surge line, but due to the problem such as deviation of sensor accuracy, causes compressor frequency to control inaccurate, make compressor
Surge control is inaccurate, affects the properly functioning of compressor.
Summary of the invention
In view of the inaccurate problem of above-mentioned compressor surge control, it is an object of the invention to provide a kind of surge control side
Method and system, it is possible to according to the current surge curve of running state parameter correction of compressor, improve the standard that compressor surge controls
Really property and reliability.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of surge controlling method, comprises the steps:
Obtain compressor running state parameter under current working；
Judge whether described compressor occurs surge according to compressor running state parameter under current working；
Record running state parameter during described compressor generation surge, it is thus achieved that surging condition parameter；
Adjusting the running frequency of described compressor to target frequency, described compressor stops breathing heavily at described target frequency
Shake；
Record the running state parameter corresponding with described target frequency, it is thus achieved that dbjective state parameter；
According to described surging condition parameter and/or the current surge curve of dbjective state parameters revision, it is thus achieved that target surge is bent
Line；
The running status of described compressor is controlled according to described target surge curve.
Wherein in an embodiment, described method further comprises the steps of:
Whenever described compressor occurs a surge, the running frequency of described compressor is heightened one or more first pre-
If frequency, until the running frequency of described compressor reaches described target frequency.
Wherein in an embodiment, when judging that described compressor does not occurs surge, described method also includes walking as follows
Rapid:
Judge that the running frequency of described compressor is the most corresponding less than or equal to pumping point in described current surge curve
Surge frequency；
Judge whether described compressor continues unloading；
When the surge frequency that the running frequency of described compressor is corresponding less than or equal to pumping point in described current surge curve
When rate and described compressor continue unloading, the running frequency of described compressor is turned down the second predeterminated frequency, it is thus achieved that intermediate frequency,
Until described compressor stops unloading or described intermediate frequency reaches described target frequency.
Wherein in an embodiment, described method also comprises the steps:
Obtain and record the running state parameter corresponding with described intermediate frequency, it is thus achieved that intermediateness parameter；
Continue to judge whether described compressor occurs surge according to described intermediateness parameter；
When judging to occur surge, return the step obtaining described surging condition parameter；
When judging surge, the running frequency of described compressor is turned down described second predeterminated frequency, continues to obtain
Obtain described intermediate frequency.
Wherein in an embodiment, described method also comprises the steps:
Surge deviation value is calculated according to described current surge curve and surging condition parameter；
Judge that whether described surge deviation value is more than or equal to preset reference value；
When described surge deviation value is more than or equal to preset reference value, then according to described surge deviation value and dbjective state
Current surge curve described in parameters revision, it is thus achieved that described target surge curve.
Additionally, present invention also offers a kind of surge control system, including:
Acquisition module, for obtaining compressor running state parameter under current working；
According to compressor running state parameter under current working, first judge module, for judging that described compressor is
No generation surge；
First memory module, running state parameter during for recording described compressor generation surge, it is thus achieved that surging condition
Parameter；
Frequency regulation block, for adjusting the running frequency of described compressor to target frequency, described compressor is in institute
State stopping surge at target frequency；
Second memory module, for the running state parameter that record is corresponding with described target frequency, it is thus achieved that dbjective state is joined
Number；
Correcting module, for according to described surging condition parameter and/or the current surge curve of dbjective state parameters revision, obtains
Obtain target surge curve；
Monitoring module, for controlling the running status of described compressor according to described target surge curve.
Wherein in an embodiment, described frequency regulation block includes the first regulation unit, for whenever described compression
There is a surge in machine, the running frequency of described compressor is heightened one or more first predeterminated frequency, until described compression
The running frequency of machine reaches described target frequency.
Wherein in an embodiment, described system also includes the second judge module and the 3rd judge module, described frequency
Adjusting module also includes the second regulation unit；
Whether described second judge module works as less than or equal to described for the current operation frequency judging described compressor
The surge frequency that in front surge curve, pumping point is corresponding；Described 3rd judge module is used for judging whether described compressor continues to unload
Carry；
Described second regulation unit is less than or equal to described current surge for the current operation frequency when described compressor
When surge frequency that on curve, pumping point is corresponding and described compressor continue unloading, the running frequency of described compressor is turned down the
Two predeterminated frequencies, it is thus achieved that intermediate frequency, until described compressor stops unloading or described intermediate frequency reaches described target frequency.
Wherein in an embodiment, described acquisition module is additionally operable to obtain and record the fortune corresponding with described intermediate frequency
Row state parameter, it is thus achieved that intermediateness parameter；
Described first judge module is additionally operable to judge whether described compressor occurs surge according to described intermediateness parameter.
Wherein in an embodiment, described system also includes computing module and the 4th judge module；
Described computing module is for calculating surge deviation value according to described current surge curve and surging condition parameter；
Described 4th judge module is used for judging that whether described surge deviation value is more than or equal to preset reference value；
Described correcting module is additionally operable to when described surge deviation value is more than or equal to preset reference value, then breathe heavily described in basis
Current surge curve described in deviation of shaking value and dbjective state parameters revision, it is thus achieved that described target surge curve.
The invention has the beneficial effects as follows:
The surge controlling method of the present invention and system, surging condition parameter and/or dbjective state parameter according to record are repaiied
Proper front surge curve, makes target surge curve consistent with the actual pumping point of compressor, and target surge curve can be with compression
Machine mates, and controls the running status of compressor according to target surge curve, such that it is able to improve the standard that compressor surge controls
Really property and reliability, solves the problems such as the compressor caused due to surge cannot unload.
Accompanying drawing explanation
Fig. 1 is the control flow chart of surge controlling method one embodiment of the present invention；
Fig. 2 is the control flow chart of another embodiment of surge controlling method of the present invention；
Fig. 3 is the structured flowchart of surge control system one embodiment of the present invention.
Detailed description of the invention
In order to make technical scheme clearer, below in conjunction with accompanying drawing, to the surge controlling method of the present invention and
System is described in further detail.Should be appreciated that specific embodiment described herein is only in order to explain the present invention need not
In limiting the present invention.It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can
To be mutually combined.
As it is shown in figure 1, one embodiment of the invention provides a kind of surge controlling method, comprise the steps:
S100, acquisition compressor are at the running state parameter of current working；Wherein, the running state parameter of compressor is permissible
Including the running frequency of compressor, operating current, pressure of inspiration(Pi), pressure at expulsion, guide vane opening etc..In the present embodiment, compression
The operating current of machine can be obtained by the detection such as current sensor or current transformer, and pressure of inspiration(Pi) can be by being arranged on pressure
The pressure detector of contracting machine air entry obtains, and pressure at expulsion can obtain by being arranged on the pressure detector of exhaust outlet of compressor
?.Specifically, control system can obtain the compressor running status in each moment of current working join according to sample requirement
Number, it can be multiple for i.e. obtaining running state parameter, to ensure the reliability that compressor surge controls.
S200, judge whether compressor occurs surge according to compressor running state parameter under current working；This reality
Executing in example, control system can be according to the rate of change of pressure of inspiration(Pi), the rate of change of pressure at expulsion, relative speed variation, minimum discharge
And one or more in inlet flow rate rate of change judge whether compressor occurs surge phenomenon.Such as, when compressor is just
When often running under operating mode, its pressure at expulsion rate of change and inlet flow rate rate of change are the least, when compressor is proximal or into surge work
Condition is, its pressure at expulsion rate of change and inlet flow rate rate of change the most significantly increase, therefore, when compressor aerofluxus rate of change and
When inlet flow rate rate of change all increases, compressor generation surge is described.Certainly, in other embodiments, it is also possible to pass through audiometry
The pneumatic noise etc. of compressor outlet pipeline judges whether compressor occurs surge.
Running state parameter when S300, recording compressed machine generation surge, it is thus achieved that surging condition parameter, in order to obtain compression
The true surge curve of machine.In the present embodiment, control system can obtain compressor in surging condition parameter the most in the same time, i.e.
The quantity of the surging condition parameter obtained can be multiple, in order to according to surging condition parameter, current surge curve is carried out pointwise
Comparison correction.
S400, adjusting the running frequency of compressor to target frequency, compressor stops surge at target frequency；I.e. mesh
Mark frequency is compressor and the minimum frequency of surge, i.e. target frequency will not be occurred to be the actual pumping point of compressor.Therefore,
By the running frequency in each moment of compressor all being adjusted to corresponding target frequency, target surge curve can be obtained.
In actual application, control system can pass through PI (proportion integration, proportional integral),
The running frequency of compressor is adjusted by the mode controlled, until the running frequency of compressor reaches target frequency, stops breathing heavily
Shake.Specifically, whenever judging that compressor occurs a surge, the running frequency of compressor is heightened one or more first and presets
Frequency, afterwards repeated execution of steps S200, until compressor stops surge.Wherein, the first predeterminated frequency can be according to compressor
Running state parameter sets itself, it is also possible to be configured according to the maximum frequency values of compressor.Such as, frequency is preset by first
Rate is set to the 1%～5% of compressor maximum frequency values.
S500, the dbjective state parameter of the compressor that record is corresponding with target frequency；I.e. control system obtains and records pressure
Contracting machine dbjective state parameter at target frequency, in order to current surge curve is modified.
S600, according to the surging condition parameter of compressor and/or the current surge curve of dbjective state parameters revision, it is thus achieved that mesh
Mark surge curve.In the present embodiment, surge curve can be obtained by equation below:
F=AX2+BX+C+(1-Y)×I；
Wherein, F represents that surge curve, X represent the ratio of pressure at expulsion and pressure of inspiration(Pi), and Y represents that guide vane opening, I represent
The operating current of compressor, A, B, C are constant.Wherein, control system simulates and compressor by the way of emulation in advance
The surge curve joined, i.e. control system can pre-set the initial value of parameter A, B and C.
Therefore, it can the surging condition parameter by compressor and/or the value of dbjective state parameters revision A, B or C, from
And realize revising the purpose of incipient surge curve, it is thus achieved that target surge curve so that target surge curve is true with compressor
Pumping point is more pressed close to, such that it is able to improve accuracy and reliability that compressor surge controls.For example, it is possible to pass through target-like
The numerical value of state gain of parameter X, Y and I, and according to the number of surging condition parameter Yu deviation value correction A, B and C of current surge curve
Value, thus obtain target surge curve, make target surge curve match with compressor, specifically can be found in discussed below.
S700, according to target surge curve control compressor running status, i.e. can be controlled by target surge curve
The running frequency of compressor so that the running frequency of compressor is in the upper area of target surge curve all the time, it is to avoid compression
Machine generation surge, can improve the reliability that compressor surge controls.
It should be understood that, pumping point is the minimum frequency that compressor will not occur surge under current working, surge is bent
Line is the set of all pumping points.Compressor only operates in the upper area of surge line just will not occur surge phenomenon, otherwise,
Probably there is surge phenomenon in compressor.The i.e. running frequency of compressor should be corresponding more than the pumping point in surge curve
Surge frequency, to avoid the generation of surge.
In one embodiment, as in figure 2 it is shown, when judging that compressor does not occurs surge, said method also includes as follows
Step:
S210, judge the surge that the running frequency of compressor is whether the most corresponding less than or equal to pumping point in current surge curve
Frequency；When the surge frequency that the running frequency of compressor is corresponding less than or equal to pumping point in current surge curve, illustrate to work as
Front surge curve can not mate the operation demand of compressor, and compressor yet suffers from the risk of surge, by determining whether
Compressor operating frequency, can reduce erroneous judgement further, improves accuracy and reliability that compressor surge controls.Work as compressor
The running frequency surge frequency corresponding more than pumping point on incipient surge curve time, illustrate compressor operating at nominal situation,
Now, the running state parameter of recording compressed machine is obtained.
In the present embodiment, owing to surge curve can change according to the change of compressor operating operating mode, therefore, work as compression
When machine does not occurs surge phenomenon, it may be possible to current surge curve is not mated with the running status of compressor, therefore, by continuing
Judge the frequency that the running frequency of compressor is corresponding with pumping point in current surge curve, surge control can be improved further
Accuracy and reliability.
S220, judge compressor whether continue unloading, i.e. control system can be further according to the operation demand of compressor
Judge whether the running frequency of compressor continues to reduce.
When the running frequency of described compressor is less than or equal to surge frequency and the compression that in surge curve, pumping point is corresponding
When machine continues unloading, then perform following steps:
S230, the running frequency of compressor is turned down the second predeterminated frequency, it is thus achieved that intermediate frequency, until compressor stops unloading
Carry or intermediate frequency reaches target frequency.In the present embodiment, the acquisition of intermediate frequency can also use the mode that PI controls.
Specifically, when judging that compressor does not occurs the running frequency of surge and described compressor less than or equal to surge curve
The surge frequency that upper pumping point is corresponding, and when compressor still needs to proceed unloading, the running frequency of compressor is turned down one
Or multiple second predeterminated frequency, it is thus achieved that intermediate frequency, afterwards repeated execution of steps S230～step S250, until frequency in the middle of above-mentioned
Rate reaches target frequency or compressor stops unloading.Wherein, the second predeterminated frequency can be according to the running state parameter of compressor
Sets itself, it is also possible to be configured according to the maximum frequency values of compressor.Such as, the second predeterminated frequency is set to compressor
The 1%～5% of maximum frequency values.Otherwise, then step S100 is returned, i.e. when the current operation frequency of compressor is more than current surge
The surge frequency that on curve, pumping point is corresponding, and/or when compressor does not continue unloading, return step S100, continue to obtain compression
The running state parameter of machine.
Further, when judging that compressor does not occurs the running frequency of surge and compressor to be less than or equal in surge curve
The surge frequency that pumping point is corresponding, and when compressor still needs to proceed unloading, then perform following steps:
S240, obtain and record the running state parameter of the compressor corresponding with intermediate objective frequency, it is thus achieved that intermediateness
Parameter；
S250, intermediateness parameter according to compressor judge whether compressor occurs surge, when judging that compressor occurs
During surge, repeated execution of steps S300～step S700, i.e. perform following steps:
Running state parameter when S300, recording compressed machine generation surge, it is thus achieved that surging condition parameter, in order to obtain compression
The true surge curve of machine.In the present embodiment, control system can obtain compressor in surging condition parameter the most in the same time, i.e.
The quantity of the surging condition parameter obtained can be multiple, in order to according to surging condition parameter, current surge curve is carried out pointwise
Comparison correction.
S400, adjusting the running frequency of compressor to target frequency, compressor stops surge at target frequency；I.e. mesh
Mark frequency is compressor and the minimum frequency of surge, i.e. target frequency will not be occurred to be the actual pumping point of compressor.Therefore,
By the running frequency in each moment of compressor all being adjusted to corresponding target frequency, target surge curve can be obtained.
S500, the dbjective state parameter of the compressor that record is corresponding with target frequency；I.e. control system obtains and records pressure
Contracting machine dbjective state parameter at target frequency, in order to current surge curve is modified.
S600, according to the surging condition parameter of compressor and/or the current surge curve of dbjective state parameters revision, it is thus achieved that mesh
Mark surge curve；
S700, according to target surge curve control compressor running status.
Otherwise, when i.e. there is not surge according to intermediateness parameter decision compressor, then return step 230, continue to turn down
The running frequency of compressor, repeated execution of steps S230～step S250.
As further improving, said method also comprises the steps:
Surging condition parameter according to current surge curve and record calculates surge deviation value；Wherein, control system is permissible
The state parameter of current surge curve the most corresponding for the surging condition parameter the most in the same time of record is compared, obtains
Obtain multiple surge deviation values.
Judge that whether surge deviation value is more than or equal to preset reference value；Wherein, preset reference value can be according to compressor
Operational factor etc. be set, to ensure that compressor can be properly functioning.
When described surge deviation value is more than or equal to preset reference value, then according to surge deviation value and dbjective state parameter
Revise current surge curve, it is thus achieved that target surge curve.Otherwise, then it is assumed that current surge curve can be mated with compressor, temporarily
It is made without revising, to reduce the operand of control system, improves the response efficiency of control system.
Such as, surge deviation value is more than or equal to preset reference value, and judges current surge curve according to surge deviation value
Inclined on the whole, then can be by parameter C in surge curve formula so that whole surge curve entirety moves down, and combining target
State parameter obtains target surge curve so that the actual pumping point of target surge curve and compressor is pressed close to mutually.
Further, control system judges that each surge deviation value is more than or equal to preset reference value and right respectively
Above-mentioned comparative result is added up.Such as, its value is designated as the first surge more than or equal to the surge deviation value of preset reference value
Deviation value, is otherwise designated as the second surge deviation value.Control system judge simultaneously the quantity of the first surge deviation value whether more than or
Equal to predetermined threshold value, wherein, predetermined threshold value can be the 50%～80% of surge inclined difference quantities summation.
When the first surge deviation value is more than or equal to predetermined threshold value, then the surge shape of current surge curve and record is described
The overall deviation of state parameter is relatively big, now, according to surge deviation value and the current surge curve of dbjective state parameters revision, it is thus achieved that mesh
Mark surge curve so that the actual pumping point of target surge curve and compressor is pressed close to mutually, to improve compressor surge control
Reliability and accuracy.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, be permissible
Instructing relevant hardware by computer program to complete, described program can be stored in a computer read/write memory medium
In, this program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access
Memory, RAM) etc..
Additionally, as it is shown on figure 3, one embodiment of the invention additionally provides a kind of surge control system, be used for including centrifugal pressure
The surge control such as contracting machine or variable frequency centrifuge, including acquisition module the 100, first judge module the 200, first memory module 300, frequently
Rate adjusting module the 400, second memory module 500, correcting module 600 and monitoring module 700.
Acquisition module 100 is for obtaining compressor running state parameter under current working；Wherein, the operation of compressor
State parameter can include the running frequency of compressor, operating current, pressure of inspiration(Pi), pressure at expulsion, guide vane opening etc..Obtain
Module 100 can include current sensor, speed probe, pressure transducer etc..
Whether first judge module 200 is for judging compressor according to compressor running state parameter under current working
There is surge；In the present embodiment, the first judge module 200 can according to the rate of change of pressure of inspiration(Pi), the rate of change of pressure at expulsion,
One or more in relative speed variation, minimum discharge and inlet flow rate rate of change judge whether compressor occurs surge existing
As.
Running state parameter when first memory module 300 is for recording described compressor generation surge, it is thus achieved that surge shape
State parameter, in the present embodiment, acquisition module 100 can obtain compressor in surging condition parameter the most in the same time, i.e. obtains
The quantity of surging condition parameter can be multiple, in order to according to surging condition parameter, current surge curve is carried out pointwise comparison and repaiies
Just.First memory module 300 can be read only memory (ROM), random access memory (RAM) or dynamic memory
(DRAM)。
Frequency regulation block 400 is for adjusting the running frequency of compressor to target frequency compressor at target frequency
Stop surge；I.e. target frequency is compressor the minimum frequency of surge will not occur, and target frequency is the reality of compressor
Pumping point.
Second memory module 500 is for recording the running state parameter corresponding with target frequency, it is thus achieved that dbjective state parameter,
I.e. second memory module 500 obtains and recording compressed machine dbjective state parameter at target frequency, in order to bent to current surge
Line is modified.Second memory module 500 can be read only memory (ROM), random access memory (RAM) or dynamic memory
Device (DRAM).
Correcting module 600 is for according to surging condition parameter and/or the current surge curve of dbjective state parameters revision, it is thus achieved that
Target surge curve；In the present embodiment, surge curve can be obtained by equation below:
F=AX2+BX+C+(1-Y)×I；
Wherein, F represents that surge curve, X represent the ratio of pressure at expulsion and pressure of inspiration(Pi), and Y represents that guide vane opening, I represent
The operating current of compressor, A, B, C are constant.
Therefore, it can the surging condition parameter by compressor and/or the value of dbjective state parameters revision A, B or C, from
And realize revising the purpose of incipient surge curve, it is thus achieved that target surge curve so that target surge curve is true with compressor
Pumping point is more pressed close to, such that it is able to improve accuracy and reliability that compressor surge controls.
Monitoring module 700 for controlling the running status of compressor according to target surge curve, i.e. monitoring module can lead to
Cross target surge curve and control the running frequency of compressor so that the running frequency of compressor is in target surge curve all the time
Upper area, it is to avoid compressor generation surge, can improve the reliability that compressor surge controls.
Wherein, acquisition module the 100, first judge module the 200, first memory module 300 in the control system of the present embodiment,
Frequency regulation block the 400, second memory module 500, correcting module 600 and monitoring module 700 respectively with above-mentioned surge control
Step S100～S700 in method are correspondingly arranged, and can be found in described above during its specific works.
In one embodiment, frequency regulation block 400 includes the first regulation unit, and the first regulation unit is for whenever pressure
There is a surge in contracting machine, the running frequency of compressor is heightened one or more first predeterminated frequency, until the fortune of compressor
Line frequency reaches target frequency.I.e. first regulation unit can pass through PI (proportion integration, proportional integral),
The running frequency of compressor is adjusted by the mode controlled, until the running frequency of compressor reaches target frequency, stops breathing heavily
Shake.Wherein, the first predeterminated frequency can be according to the running state parameter sets itself of compressor, it is also possible to according to compressor
Big frequency values is configured.Such as, the first predeterminated frequency is set to the 1%～5% of compressor maximum frequency values.
In one embodiment, said system also includes the second judge module and the 3rd judge module, frequency regulation block
Also include the second regulation unit；Wherein, the second judge module is for judging that whether the running frequency of compressor is less than or equal to working as
The surge frequency that in front surge curve, pumping point is corresponding, when the running frequency of compressor is less than or equal in current surge curve breathe heavily
During the corresponding surge frequency of shaking, illustrating that current surge curve can not mate the operation demand of compressor, compressor is still deposited
Risk in surge.When the surge frequency that the running frequency of compressor is corresponding more than pumping point on incipient surge curve, explanation
Compressor operating is at nominal situation, now, obtains the running state parameter of recording compressed machine.3rd judge module is used for judging pressure
Whether contracting machine continues unloading, and the i.e. the 3rd judge module can determine whether the operation of compressor according to the operation demand of compressor
Whether frequency continues to reduce.
Second regulation unit is less than or equal to pumping point in current surge curve for the current operation frequency when compressor
When corresponding surge frequency and compressor continue unloading, the running frequency of compressor is turned down the second predeterminated frequency, it is thus achieved that middle
Frequency, until compressor stops unloading or described intermediate frequency reaches described target frequency.In the present embodiment, obtaining of intermediate frequency
Obtain the mode that PI can also be used to control.Specifically, judge that compressor does not occurs surge and second to judge when the first judge module
Module judges the surge frequency that the running frequency of compressor is corresponding less than or equal to pumping point in surge curve, and the 3rd judges mould
Block judges, when compressor still needs to proceed unloading, the running frequency of compressor to be turned down one or more second predeterminated frequency,
Obtain intermediate frequency, until above-mentioned intermediate frequency reaches target frequency or compressor stops unloading.Wherein, the second predeterminated frequency can
With the running state parameter sets itself according to compressor, it is also possible to be configured according to the maximum frequency values of compressor.Such as,
Second predeterminated frequency is set to the 1%～5% of compressor maximum frequency values.
Acquisition module 100 is additionally operable to obtain and record the running state parameter corresponding with intermediate frequency, it is thus achieved that intermediateness
Parameter；First judge module 200 is additionally operable to judge whether compressor occurs surge according to intermediateness parameter.So, by entering
One step judges that compressor operating frequency and unloading demand obtain intermediateness parameter, and determines whether according to intermediateness parameter
Whether compressor there is surge, can reduce erroneous judgement further, improves accuracy and reliability that compressor surge controls.
As further improving, said system also includes computing module and the 4th judge module；Wherein, computing module is used
In calculating surge deviation value according to current surge curve and surging condition parameter；Wherein, computing module can include multiple calculating
Unit, each computing unit is used for the shape of the most corresponding current surge curve of the surging condition parameter according to current time
State parameter compares, it is thus achieved that multiple surge deviation values.
4th judge module is used for judging that whether surge deviation value is more than or equal to preset reference value；Wherein, preset reference
Value can be set according to the operational factor etc. of compressor, to ensure that compressor can be properly functioning.Further, the 4th sentences
Disconnected module can also include multiple judging unit, and each judging unit is for judging whether a surge deviation value is more than or equal to
Preset reference value.
Correcting module 600 is additionally operable to when surge deviation value is more than or equal to preset reference value, then according to surge deviation value
And the current surge curve of dbjective state parameters revision, it is thus achieved that target surge curve.Otherwise, then it is assumed that current surge curve can be with
Compressor mates, and wouldn't need to be modified, and to reduce the operand of control system, improves the response efficiency of control system.
Such as, when the 4th judge module judges that surge deviation value is more than or equal to preset reference value, and according to surge deviation
Value judges that current surge curve is inclined on the whole, then correcting module can pass through parameter C in surge curve formula so that whole breathe heavily
Curve entirety of shaking moves down, and combining target state parameter obtains target surge curve so that target surge curve and compressor
Actual pumping point is pressed close to mutually.
Further, control system also includes the 5th judge module and sort module, and described sort module is for right
The comparative result of the second judge module is added up.Such as, sort module is for being more than or equal to preset reference value by its value
Surge deviation value is designated as the first surge deviation value, is otherwise designated as the second surge deviation value.5th judge module is used for judgement first
Whether the quantity of surge deviation value is more than or equal to predetermined threshold value, and wherein, predetermined threshold value can be surge inclined difference quantities summation
50%～80%.When the first surge deviation value is more than or equal to predetermined threshold value, then current surge curve and record are described
The overall deviation of surging condition parameter is relatively big, now, according to surge deviation value and the current surge curve of dbjective state parameters revision,
Obtain target surge curve so that the actual pumping point of target surge curve and compressor is pressed close to, mutually to improve compressor surge
The reliability controlled and accuracy.
It should be understood that, the operation principle of the surge control system of the present embodiment with above-mentioned in surge controlling method
Execution step is basically identical, specifically can be found in described above.
The surge controlling method of the present invention and system, surging condition parameter and/or dbjective state parameter according to record are repaiied
Proper front surge curve, makes target surge curve consistent with the actual pumping point of compressor, and target surge curve can be with compression
Machine mates, and controls the running status of compressor according to target surge curve, such that it is able to improve the standard that compressor surge controls
Really property and reliability, solves the problems such as the compressor caused due to surge cannot unload.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that, for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a surge controlling method, it is characterised in that comprise the steps:
Obtain compressor running state parameter under current working；
Judge whether described compressor occurs surge according to compressor running state parameter under current working；
Record running state parameter during described compressor generation surge, it is thus achieved that surging condition parameter；
Adjusting the running frequency of described compressor to target frequency, described compressor stops surge at described target frequency；
Record the running state parameter corresponding with described target frequency, it is thus achieved that dbjective state parameter；
According to described surging condition parameter and/or the current surge curve of dbjective state parameters revision, it is thus achieved that target surge curve；
The running status of described compressor is controlled according to described target surge curve.
Surge controlling method the most according to claim 1, it is characterised in that described method further comprises the steps of:
Whenever described compressor occurs a surge, the running frequency of described compressor is heightened one or more first and presets frequency
Rate, until the running frequency of described compressor reaches described target frequency.
Surge controlling method the most according to claim 1, it is characterised in that when judging that described compressor does not occurs surge
Time, described method also comprises the steps:
Judge the surge that the running frequency of described compressor is the most corresponding less than or equal to pumping point in described current surge curve
Frequency；
Judge whether described compressor continues unloading；
When the running frequency of the described compressor surge frequency corresponding less than or equal to pumping point in described current surge curve and
When described compressor continues unloading, the running frequency of described compressor is turned down the second predeterminated frequency, it is thus achieved that intermediate frequency, until
Described compressor stops unloading or described intermediate frequency reaches described target frequency.
Surge controlling method the most according to claim 3, it is characterised in that described method also comprises the steps:
Obtain and record the running state parameter corresponding with described intermediate frequency, it is thus achieved that intermediateness parameter；
Continue to judge whether described compressor occurs surge according to described intermediateness parameter；
When judging to occur surge, then return the step obtaining described surging condition parameter；
When judging surge, the running frequency of described compressor is turned down described second predeterminated frequency, continue to obtain institute
State intermediate frequency.
5. according to the surge controlling method described in any one of claim 1-4, it is characterised in that described method also includes walking as follows
Rapid:
Surge deviation value is calculated according to described current surge curve and surging condition parameter；
Judge that whether described surge deviation value is more than or equal to preset reference value；
When described surge deviation value is more than or equal to preset reference value, then according to described surge deviation value and dbjective state parameter
Revise described current surge curve, it is thus achieved that described target surge curve.
6. a surge control system, it is characterised in that including:
Acquisition module, for obtaining compressor running state parameter under current working；
According to compressor running state parameter under current working, first judge module, for judging whether described compressor is sent out
Raw surge；
First memory module, running state parameter during for recording described compressor generation surge, it is thus achieved that surging condition parameter；
Frequency regulation block, for adjusting the running frequency of described compressor to target frequency, described compressor is at described mesh
Surge is stopped at mark frequency；
Second memory module, for the running state parameter that record is corresponding with described target frequency, it is thus achieved that dbjective state parameter；
Correcting module, for according to described surging condition parameter and/or the current surge curve of dbjective state parameters revision, it is thus achieved that mesh
Mark surge curve；
Monitoring module, for controlling the running status of described compressor according to described target surge curve.
Surge control system the most according to claim 6, it is characterised in that described frequency regulation block includes the first regulation
Unit, for there is a surge whenever described compressor, heightens one or more first by the running frequency of described compressor
Predeterminated frequency, until the running frequency of described compressor reaches described target frequency.
Surge control system the most according to claim 6, it is characterised in that described system also include the second judge module and
3rd judge module, described frequency regulation block also includes the second regulation unit；
Whether described second judge module is currently breathed heavily less than or equal to described for the current operation frequency judging described compressor
The surge frequency that the pumping point on curve that shakes is corresponding；Described 3rd judge module is used for judging whether described compressor continues unloading；
Described second regulation unit is less than or equal to described current surge curve for the current operation frequency when described compressor
When surge frequency that upper pumping point is corresponding and described compressor continue unloading, the running frequency of described compressor is turned down second pre-
If frequency, it is thus achieved that intermediate frequency, until described compressor stops unloading or described intermediate frequency reaches described target frequency.
Surge control system the most according to claim 8, it is characterised in that described acquisition module is additionally operable to obtain and record
The running state parameter corresponding with described intermediate frequency, it is thus achieved that intermediateness parameter；
Described first judge module is additionally operable to judge whether described compressor occurs surge according to described intermediateness parameter.
10. according to the surge control system described in any one of claim 6-9, it is characterised in that described system also includes calculating
Module and the 4th judge module；
Described computing module is for calculating surge deviation value according to described current surge curve and surging condition parameter；
Described 4th judge module is used for judging that whether described surge deviation value is more than or equal to preset reference value；
Described correcting module is additionally operable to when described surge deviation value is more than or equal to preset reference value, then inclined according to described surge
Current surge curve described in difference and dbjective state parameters revision, it is thus achieved that described target surge curve.
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