CN110011572A - Angle star switching method and frequency converter - Google Patents
Angle star switching method and frequency converter Download PDFInfo
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- CN110011572A CN110011572A CN201910280673.XA CN201910280673A CN110011572A CN 110011572 A CN110011572 A CN 110011572A CN 201910280673 A CN201910280673 A CN 201910280673A CN 110011572 A CN110011572 A CN 110011572A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/32—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by star/delta switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/01—Asynchronous machines
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Abstract
The present embodiments relate to frequency control field, a kind of angle star switching method and frequency converter are disclosed.In the embodiment of the present invention, the asynchronous machine to connect with frequency converter accesses up in an angular manner in advance；Angle star switching method includes: the converter parameter for being stored in advance and being obtained according to the nameplate parameter of asynchronous machine；Converter parameter includes angular voltage rating, star voltage rating and Rated motor frequency；Angular enabling signal is received, according to angular voltage rating and the operation of Rated motor frequency so that asynchronous machine carries out angular starting under the power supply of Rated motor voltage；When determining asynchronous machine start completion, according to star voltage rating and the operation of Rated motor frequency so that every phase winding of asynchronous machine works under phase winding voltage rating.The embodiment of the invention also provides a kind of frequency converters.The embodiment of the present invention to need reduced-voltage starting mode under the scene of high current Starting mode at the same time, is only realized by frequency converter, saves cost and simplify operation, provide convenience.
Description
Technical field
The present embodiments relate to frequency control field, in particular to a kind of angle star switching method and frequency converter.
Background technique
Threephase asynchronous machine is using three-phase because structure is simple, cheap, high reliability is used widely
When asynchronous machine, according to high current starting motor while directly connecing 380V power supply (such as motor), starting current usually up to 8~
12 times of rated current, biggish starting current not only can form biggish electrical impact and machinery to machine winding and mechanical load
Impact, and probably to power grid formation impact, (especially when electrical network capacity is smaller, starting motor can be such that network voltage falls
It falls, affects the normal operating conditions of other equipment).Therefore, in order to reduce the starting current of motor, when motor is directly accessed electricity
When net, the big motor of load current must use reduced-voltage starting mode.
In the prior art, there are two types of common reduced-voltage starting modes, the first is star-angle conversion start mode, i.e. motor
Power supply is accessed according to star connection when starting, is switched to after start completion and is continued to run according to angular connection access power supply；But this
The shortcomings that kind mode is to be started using sacrificing detent torque as cost.Second is to motor using frequency converter with VVVF (transformation
Frequency control) mode start, this kind of mode can be effectively by electric motor starting current limit on a left side for 1.5 times of rated current
The right side, and the detent torque of this kind of mode up to 1.5 times or more of nominal torque, i.e., this kind of mode is better than first way,
The first star-angle conversion start mode is substituted substantially in.
However, it is found by the inventors that at least there are the following problems in the prior art: in some special screnes, needing to utilize motor
The high current of starting obtains highest detent torque, so that motor be forced to reach rated output revolving speed within the shortest time, keeps away
Exempt from the problems such as technique substandard products occur；Such as in air-jet loom, the specified connection of threephase asynchronous machine is star connection 380V, is needed
Motor is started using high current, i.e. motor needs are started on startup with angular connection, after start completion, are transformed into star
Shape connection is to operate normally.But current frequency converter does not have angle star handoff functionality, can not start motor using high current,
It is existing still to be realized using angle star contactor in above-mentioned special screne, Material Cost is increased, and wiring is complicated, maintenance
Higher cost.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of angle star switching method and frequency converter, so that needing to drop at the same time
Under the scene for pressing Starting mode and high current Starting mode, is only realized by frequency converter, save cost and simplify operation, mention
Convenience is supplied.
In order to solve the above technical problems, embodiments of the present invention provide a kind of angle star switching method, with the frequency conversion
The asynchronous machine that device connects accesses up in an angular manner in advance；The angle star switching method includes: to be stored in advance according to described asynchronous
The converter parameter that the nameplate parameter of motor obtains；The converter parameter includes at least angular voltage rating, the specified electricity of star
Pressure and Rated motor frequency；After receiving angular enabling signal, according to the angular voltage rating and the Rated motor frequency
Operation carries out angular starting for the asynchronous machine under the power supply of Rated motor voltage；When the judgement asynchronous machine starting
After the completion, according to the star voltage rating and Rated motor frequency operation so that every phase winding of the asynchronous machine exists
It works under phase winding voltage rating.
Embodiments of the present invention additionally provide a kind of frequency converter, comprising: at least one processor；And with it is described extremely
The memory of few processor communication connection；Wherein, the memory, which is stored with, to be executed by least one described processor
Instruction, described instruction is executed by least one described processor, so that at least one described processor is able to carry out as above-mentioned
Angle star switching method.
Embodiments of the present invention additionally provide a kind of computer readable storage medium, are stored with computer program, described
Above-mentioned angle star switching method is realized when computer program is executed by processor.
Embodiment of the present invention in terms of existing technologies, provides a kind of angle star switching method applied to frequency converter,
And the asynchronous machine to connect with frequency converter accesses up in an angular manner in advance；This method includes the inscription being stored in advance according to asynchronous machine
The converter parameter that board parameter obtains, converter parameter include at least angular voltage rating, star voltage rating and Rated motor
Frequency, after receiving angular enabling signal, according to angular voltage rating and the operation of Rated motor frequency so that asynchronous machine is in electricity
Angular starting is carried out under the power supply of machine voltage rating, that is, every phase winding of motor is by phase winding voltage ratingTimes
Starting, so that motor obtains maximum current starting to realize angular starting, after determining asynchronous machine start completion, according to star
Shape voltage rating and Rated motor frequency run so that every phase winding of asynchronous machine works under phase winding voltage rating, i.e., electric
Every phase winding of machine is run by specified phase winding voltage, although motor is at this time with angular connection access frequency converter, due to power supply
Line voltage decline, so that operational effect when motor accesses frequency converter with star connection is realized, so that the embodiment of the present invention makes
Frequency converter has angle star handoff functionality, angle star contactor in the prior art and peripheral circuit cost is eliminated, so that at the same time
Under the scene for needing reduced-voltage starting mode and high current Starting mode, is only realized by frequency converter, save cost and simplify
Operation, provides convenience.
In addition, described run according to the angular voltage rating and the Rated motor frequency so that the asynchronous machine exists
It under the power supply of Rated motor voltage in angular starting, specifically includes: accelerating to accelerate to predeterminated frequency in duration default；According to institute
Angular voltage rating and the angular voltage-frequency of Rated motor frequency acquisition are stated than curve, and according to actual output frequency according to described
Angular voltage-frequency exports relevant voltage to the asynchronous machine than curve.In the present embodiment, provides and transported according to angular voltage rating
A kind of capable specific implementation.
In addition, converter parameter further includes angular predetermined current amplitude limit value, frequency converter rated current and Rated motor electricity
Stream；It is described to run according to the angular voltage rating for the asynchronous machine angular starting under the power supply of Rated motor voltage
In, further includes: angular current regulation value is received, and according to the angular current regulation value and the angular predetermined current limit ratio
Control the maximum output current to the asynchronous machine；And/or further include: according to the frequency converter rated current and detect
The actual motion electric current of the frequency converter calculates frequency converter overload values；According to the frequency converter overload values and the first default thresholds,of overload
Value controls the working condition of the frequency converter；According to the practical fortune of the rated current of motor and the asynchronous machine detected
Row electric current calculates motor overload threshold value, and controls the asynchronous machine according to the motor overload value and the second default overload values
Working condition.In the present embodiment, calculate angular current limit guarantee to export when exporting angular voltage rating it is biggish
Output current of frequency converter；It controls whether asynchronous machine needs to stop working according to motor overload value, avoids motor that from may burning
The occurrence of, improve safety.
In addition, after determining the asynchronous machine start completion, according to the star voltage rating and Rated motor frequency
Operation operation specifically includes in being worked under phase winding voltage rating for every phase winding of the asynchronous machine: when determining institute
After stating asynchronous machine start completion, according to the star voltage rating and the Rated motor frequency acquisition star voltage-frequency than bent
Line；Relevant voltage is exported to the asynchronous machine, for described than curve according to the star voltage-frequency according to actual output frequency
Every phase winding of asynchronous machine works under the phase winding voltage rating.In the present embodiment, provide according to the specified electricity of star
Press a kind of specific implementation of operation.
In addition, converter parameter further includes star predetermined current amplitude limit value, frequency converter rated current and Rated motor electricity
Stream；It is described according to the star voltage rating run for the asynchronous machine every phase winding under phase winding voltage rating work
In work, further includes: receive star current regulated value, and according to the star current regulated value and the star predetermined current clipping
Than controlling the maximum output current to the asynchronous machine；And/or further include: according to the frequency converter rated current and detect
The frequency converter actual motion electric current calculate frequency converter overload values；According to the frequency converter overload values and the first default overload
Threshold value controls the working condition of the frequency converter；According to the reality of the rated current of motor and the asynchronous machine detected
Running current calculates motor overload value；The asynchronous machine is controlled according to the motor overload value and the second default overloading threshold
Working condition.In the present embodiment, motor be must operate under rated current of motor state when motor is in star operating status, meter
The output electric current that star current amplitude limit value limits frequency converter is calculated, motor is protected.
In addition, nameplate parameter includes at least Rated motor voltage UNWith the Rated motor voltage UNCorresponding specified connection；
When the specified connection is star connection, the angular voltage rating UpN1=UN, the star voltage ratingIn the present embodiment, a kind of calculation of angular voltage rating and star voltage rating is provided.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the specific flow chart of angle star switching method according to first embodiment；
Fig. 2 is the specific flow chart according to the angle star switching method of second embodiment；
Fig. 3 is the specific flow chart according to the angle star switching method of third embodiment.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details
And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
The first embodiment of the present invention is related to a kind of angle star switching method, it is applied to frequency converter, and connects with frequency converter
Asynchronous machine access up in an angular manner in advance；As shown in Figure 1, the angle star switching method of present embodiment includes:
Step 101, after receiving angular enabling signal, according to angular voltage rating and the operation of Rated motor frequency for different
Step motor carries out angular starting under the power supply of Rated motor voltage.
In fact, the frequency converter obtained according to the nameplate parameter of asynchronous machine is stored in advance in frequency converter before this step
Parameter；Converter parameter includes at least angular voltage rating, star voltage rating and Rated motor frequency, is so not limited in practice
This, such as further include frequency converter rated current, rated current of motor, motor rated power and rated speed.
It should be noted that in the nameplate parameter of asynchronous machine, it will usually given Rated motor voltage and corresponding star angle
The parameters such as connection, rated current, rated frequency, rated power, rated speed.Specifically, it is assumed that access appointing for motor power
Two voltages between phases of anticipating are power line voltage Ul, the electric current that any one power supply line flows into is power lead current Il, in asynchronous machine,
The end voltage of any one phase winding is phase winding voltage Up, the electric current that winding flows through is phase winding electric current Ip, then,
When motor accesses frequency converter with angular connection, power line voltage, power lead current and phase winding voltage, phase winding
The relationship of electric current is formula one: Up=Ul,
When motor accesses frequency converter with star connection, power line voltage, power lead current and phase winding voltage, phase winding
The relationship of electric current is formula two:Ip=Il。
By above-mentioned relation it is found that change motor Y connection, actually eventually change motor phase winding voltage and
Phase winding electric current；Motor is run by nominal parameter, is substantially so that every phase winding of motor works specified
Under phase winding voltage and phase winding electric current.And after phase winding voltage and phase winding electric current determine, star connection and angular
Power supply line voltage rating and power supply line rated current corresponding to connection are different.For example, when motor presses angular connection
Access, and input voltage isWhen, the working effect and motor of motor are accessed by star connection, and input voltage is Ul's
Working effect is identical, because the phase winding voltage for being finally applied to winding isThat is, the present invention is implemented
In example, using the function for the voltage regulation and frequency modulation that frequency converter has, for the motor of fixed Y connection, frequency converter can be according to default
Converter parameter export corresponding voltage, wherein for the motor of angular connection, frequency converter provides different stage to motor
Voltage, it will be able to simulate the angle scheme operating status and star-star connection operating status of motor.
In present embodiment, nameplate parameter includes at least Rated motor voltage UNWith Rated motor voltage UNIt is corresponding specified
Connection；When specified connection is star connection, angular voltage rating UpN1=UN, star voltage rating
In one example, the Rated motor voltage U in the asynchronous machine of air-jet loom, in nameplate parameterN=380V is right
Answering specified connection is star connection, and the phase winding voltage rating of the motor can be obtained according to formula two
=220V, phase winding rated current Ip=IN=8A, the angular voltage rating U of frequency converterpN1=UN=380V, star voltage ratingThe two angular voltage rating 380V and star voltage rating 220V are pre-stored in
In frequency converter；It is so here exemplary illustration, it is without being limited thereto in practice.
In present embodiment, when frequency converter starts to export according to angular voltage rating, since the practical connection of motor is
Therefore angular connection is equivalent to every phase winding by phase winding voltage ratingStart again, so that motor can obtain big electricity
Stream is equivalent to motor and carries out angular starting under the power supply of Rated motor voltage to start.
Step 102, after determining asynchronous machine start completion, according to star voltage rating and Rated motor frequency operation with
It works under phase winding voltage rating for every phase winding of asynchronous machine.
In one example, in the nameplate parameter of the asynchronous machine of air-jet loom, Rated motor frequency fN=50Hz, it is asynchronous
Motor is run according to star voltage rating, i.e., frequency converter output voltage is 220V, and every phase winding of motor is by specified phase winding electricity
Pressure operation, since power line voltage declines, realizes motor although the practical connection of motor is angular connection with star connection
The operational effect for accessing frequency converter, i.e., in the embodiment of the present invention, angle star switching front and back motor is actually with angle scheme state
Access frequency converter.
The embodiment of the present invention in terms of existing technologies, provides a kind of angle star switching method applied to frequency converter,
And the asynchronous machine to connect with frequency converter accesses up in an angular manner in advance；This method includes the inscription being stored in advance according to asynchronous machine
The converter parameter that board parameter obtains, converter parameter include at least angular voltage rating and star voltage rating, receive angle
After shape enabling signal, run according to angular voltage rating so that asynchronous machine carries out angular open under the power supply of Rated motor voltage
It is dynamic, that is, every phase winding of motor is by phase winding voltage ratingStart again, so that motor obtains maximum current starting
To realize angular starting, after determining asynchronous machine start completion, run according to star voltage rating for asynchronous machine
Every phase winding works under phase winding voltage rating, i.e., every phase winding of motor is run by specified phase winding voltage, although at this time
Motor accesses frequency converter with angular connection, but since power line voltage declines, to realize that motor accesses frequency conversion with star connection
Operational effect when device, so that the embodiment of the present invention makes frequency converter have angle star handoff functionality, so that needing to be depressured at the same time
It under the scene of Starting mode and high current Starting mode, is only realized by frequency converter, eliminates star contact in angle in the prior art
Device and peripheral circuit cost save cost and simplify operation, provide convenience.
The realization details of the angle star switching method of present embodiment is specifically described below, the following contents is only side
The realization details of offer is just provided, the necessary of this programme is not implemented.
In one example, after determining asynchronous machine start completion, specifically: after default starting duration reaches, i.e.,
Default starting duration reaches, it is believed that start completion；In the present embodiment, provide judge asynchronous machine whether one kind of start completion
Specific judgment mode.
It in another example, can be by the state of the external logic function terminal of frequency converter to determine whether having started
At, for example, when logic function terminal is closed think that, with the operation of angular state, when disconnection is thought with the operation of star state；The present embodiment
In, provide judge asynchronous machine whether another specific judgment mode of start completion.
In present embodiment, frequency converter is different with the setting value of star voltage rating according to angular voltage rating, additionally it is possible to
Realize the conversion starting of star angle, the size of the starting current that the value of angular voltage rating can be as needed is set, and adjusts angular volume
The value of constant voltage, the starting current of adjustable asynchronous machine.
The step of various methods divide above, be intended merely to describe it is clear, when realization can be merged into a step or
Certain steps are split, multiple steps are decomposed into, as long as including identical logical relation, all in the protection scope of this patent
It is interior；To adding inessential modification in algorithm or in process or introducing inessential design, but its algorithm is not changed
Core design with process is all in the protection scope of the patent.
Second embodiment of the present invention is related to a kind of angle star switching method.Second embodiment is in first embodiment
On the basis of improve, mainly the improvement is that: in second embodiment of the invention, providing according to angular voltage rating
A kind of specific implementation of operation.
The angle star switching method of present embodiment is as shown in Fig. 2, in the step 202 and first embodiment of present embodiment
Step 102 correspondence it is identical, details are not described herein, and the step 201 of present embodiment includes following sub-step:
Sub-step 2011 accelerates to accelerate to predeterminated frequency in duration default.
In present embodiment, the specific value of predeterminated frequency is not intended to be limited in any, it can be according to the actual demand at scene
To set.In the present embodiment, converter parameter further includes Rated motor frequency, is actually in the nameplate parameter of asynchronous machine
Rated frequency.
In the present embodiment, presetting acceleration duration is, for example, 0.1 second, so without being limited thereto in practice, can be had according to the actual situation
Body setting, default to accelerate duration in the state that frequency converter does not occur overcurrent alarm, setting value is the smaller the better.
Sub-step 2012, according to angular voltage rating and the angular voltage-frequency of Rated motor frequency acquisition than curve, and according to reality
Border output frequency exports relevant voltage to asynchronous machine than curve according to angular voltage-frequency.
In one example, when whether being reached with default starting duration to determine whether that is, this step exists when start completion
It is completed in default starting duration.
Preferably, in present embodiment, it is further comprising the steps of:
Sub-step 2013 receives angular current regulation value, and according to angular current regulation value and angular predetermined current clipping
Than controlling the maximum output current to asynchronous machine.
In present embodiment, converter parameter further includes angular pre-set current value, frequency converter rated current and motor volume
Constant current；Wherein, rated current of motor is the rated current in the nameplate parameter of asynchronous machineTimes, i.e., Rated motor is electric
Stream is
In present embodiment, angular predetermined current limit ratio is calculated according to frequency converter rated current and is pre-stored in frequency conversion
In device；User can modify angular default ductility limit amplitude ratio according to the actual needs of the site, to obtain angular current limit.
In one example (on the basis of the example of first embodiment), in the asynchronous machine of air-jet loom, motor
Phase winding rated current Ip=8A, therefore the rated current of motor being stored in frequency conversion in advanceSo
It here is exemplary illustration, it is without being limited thereto in practice.
In present embodiment, the star current limit ratio of frequency converter generally can be at 1.5 times or so of frequency converter rated current
(so without being limited thereto), and angular current limit ratio generally can be at 4~10 times or so.When the angular connection of use and output is angular specified
When voltage, calculate the control of angular current limit to the maximum output current of asynchronous machine, enable asynchronous machine obtain compared with
Big output current of frequency converter, to achieve the purpose that angular output.
Preferably, further including following sub-step in present embodiment:
Sub-step 2014 calculates frequency converter according to the actual motion electric current of frequency converter rated current and the frequency converter detected
Overload values, and according to the working condition of frequency converter overload values and the first default overloading threshold control frequency converter.
In present embodiment, frequency converter overload, i.e. frequency converter are with the actual motion electricity more than frequency converter rated current
Stream operation, the integral of actual motion Current versus time is able to reflect frequency converter overload, when frequency converter overload values reach certain
When value, frequency conversion acts the working condition for needing to control itself to protect equipment.First default overloading threshold be, for example, frequency converter be with
150% frequency converter rated current is actual motion electric current and continuous service 1 minute, when frequency converter overload values be more than this
One default overload values are then determined as that frequency converter overloads, control are needed to stop working to protect equipment；It is so here exemplary theory
Bright, the present embodiment is not intended to be limited in any the specific value of the first preset value.
Preferably, further including following sub-step in present embodiment:
Sub-step 2015 calculates motor mistake according to the actual motion electric current of rated current of motor and the asynchronous machine detected
Load value；According to the working condition of motor overload value and the second default overloading threshold control asynchronous machine.
In present embodiment, motor overload state, i.e. motor are run with the actual motion electric current for being more than rated current, practical
Running current is able to reflect motor overload state when motor overload value reaches certain value to the integral of time and needs to control asynchronous
Motor stopping reaches security purpose to allow motor to restore cooling, avoid motor that from may burning and so on.Second is default
Overload values are, for example, that motor is to work as frequency conversion using 150% rated current of motor as actual motion electric current and continuous service 1 minute
Device judges that motor overload value has been more than the second default overload values, then determines motor overload；Right without being limited thereto in practice, this implementation
Example is not intended to be limited in any the specific value size of the second default overload values.
The embodiment of the present invention provides the one kind run according to angular voltage rating for first embodiment
Specific implementation, i.e. frequency converter accelerate to accelerate to predeterminated frequency in duration default, according to angular voltage rating and motor volume
Determine the angular voltage-frequency of frequency acquisition than curve, and according to actual output frequency according to angular voltage-frequency than curve output motor voltage rating
To asynchronous machine, to realize that high current starts motor.
Third embodiment of the present invention is related to a kind of angle star switching method.Third embodiment is in second embodiment
On the basis of improve, mainly the improvement is that: in third embodiment of the invention, providing according to star voltage rating
A kind of specific implementation of operation.
The angle star switching method of present embodiment is as shown in figure 3, in the step 301 and second embodiment of present embodiment
Step 201 correspondence it is identical, details are not described herein, and the step 302 of present embodiment includes following sub-step:
Sub-step 3021, when determining asynchronous machine start completion, according to star voltage rating and Rated motor frequency acquisition
Star voltage-frequency compares curve.
In present embodiment, when whether being reached with default starting duration to determine whether determining default when start completion
Asynchronous machine start completion is thought in starting duration arrival.
Sub-step 3022 exports star voltage rating to asynchronous electricity than curve according to star voltage-frequency according to actual output frequency
Machine, so that every phase winding of asynchronous machine works under phase winding voltage rating.
Preferably, further including following sub-step in present embodiment:
Sub-step 3023 receives star current regulated value, and according to star current regulated value and star predetermined current clipping
Than controlling the maximum output current to asynchronous machine.
In present embodiment, after frequency converter angular start completion, when asynchronous machine is in star operating status, asynchronous electricity
Machine must operate under rated current of motor state, and the rated current that motor needs at this time can be smaller, pass through star current clipping
Value limits the output electric current of frequency converter, prevents load abnormal, avoids electric current excessive and frequency converter is caused to overload.
In present embodiment, converter parameter further includes frequency converter rated current, and star pre-set current value is according to frequency converter
Rated current is calculated and is pre-stored in frequency converter；User can input star current tune to frequency converter according to the actual needs of the site
Section value, to obtain star current amplitude limit value；Maximum output current is controlled within star current amplitude limit value.
Preferably, further including following sub-step in present embodiment:
Sub-step 3024 calculates frequency converter according to the actual motion electric current of frequency converter rated current and the frequency converter detected
Overload values, and according to the working condition of frequency converter overload values and the first default overloading threshold control frequency converter.
In the present embodiment, the explanation about monitoring frequency converter overload can refer to the phase of sub-step 2014 in a upper embodiment
It speaks on somebody's behalf bright, details are not described herein.
Sub-step 3025 calculates motor mistake according to the actual motion electric current of rated current of motor and the asynchronous machine detected
Load value, and according to the working condition of motor overload value and the second default overloading threshold control asynchronous machine.
In the present embodiment, the related description about motor overload is referred to the sub-step 2015 in a upper embodiment,
This is repeated no more.
In fact, present embodiment may be improvement project on the basis of first embodiment.
The embodiment of the present invention provides the one kind run according to angular voltage rating for second embodiment
Specific implementation, i.e., when determining asynchronous machine start completion, according to star voltage rating and Rated motor frequency acquisition star
Voltage-frequency exports relevant voltage to asynchronous machine, for asynchronous than curve according to star voltage-frequency than curve, according to actual output frequency
Every phase winding of motor works under phase winding voltage rating, to realize angular conversion.
Four embodiment of the invention is related to a kind of frequency converter, including at least one processor；And at least one
Manage the memory of device communication connection；Wherein, memory is stored with the instruction that can be executed by least one processor, instructs by least
One processor executes, so that at least one processor is able to carry out the switching of the angle star in the first, second or third embodiment
Method.
Wherein, memory is connected with processor using bus mode, and bus may include the bus of any number of interconnection
And bridge, bus is by one or more processors together with the various circuit connections of memory.Bus can also will be such as peripheral
Together with various other circuit connections of management circuit or the like, these are all well known in the art for equipment, voltage-stablizer
, therefore, it will not be further described herein.Bus interface provides interface between bus and transceiver.Transceiver
Can be an element, be also possible to multiple element, such as multiple receivers and transmitter, provide for over a transmission medium with
The unit of various other device communications.The data handled through processor are transmitted on the radio medium by antenna, further,
Antenna also receives data and transfers data to processor.
Processor is responsible for managing bus and common processing, can also provide various functions, including periodically, peripheral interface,
Voltage adjusting, power management and other control functions.And memory can be used for storage processor and execute operation when institute
The data used.
In terms of existing technologies, frequency converter can apply provided in an embodiment of the present invention one to embodiments of the present invention
Kind is applied to angle star switching method, and the asynchronous machine to connect with frequency converter accesses up in an angular manner in advance；This method includes pre-
First store according to the nameplate parameter of asynchronous machine obtain converter parameter, converter parameter include at least angular voltage rating,
Star voltage rating and Rated motor frequency, after receiving angular enabling signal, according to angular voltage rating and Rated motor frequency
Rate operation carries out angular starting for asynchronous machine under the power supply of Rated motor voltage, that is, every phase winding of motor is pressed
Phase winding voltage ratingStart again, so that motor obtains maximum current starting to realize angular starting, when judgement is asynchronous
After the completion of electric motor starting, according to star voltage rating and Rated motor frequency operation for asynchronous machine every phase winding phase around
It works under group voltage rating, i.e., every phase winding of motor is run by specified phase winding voltage, although motor is at this time with angular connection
Frequency converter is accessed, but since power line voltage declines, thus realize operational effect when motor accesses frequency converter with star connection,
To which the embodiment of the present invention makes frequency converter have angle star handoff functionality, angle star contactor in the prior art and periphery are eliminated
Circuit cost, so that under needing the scene of reduced-voltage starting mode and high current Starting mode at the same time, only by frequency converter realization,
It saves cost and simplifies operation, provide convenience.
Fifth embodiment of the invention is related to a kind of computer readable storage medium, is stored with computer program.Computer
The angle star switching method in the first, second or third embodiment is realized when program is executed by processor.
Embodiment of the present invention in terms of existing technologies, provides a kind of angle star switching method applied to frequency converter,
And the asynchronous machine to connect with frequency converter accesses up in an angular manner in advance；This method includes the inscription being stored in advance according to asynchronous machine
The converter parameter that board parameter obtains, converter parameter include at least angular voltage rating, star voltage rating and Rated motor
Frequency, after receiving angular enabling signal, according to angular voltage rating and the operation of Rated motor frequency so that asynchronous machine is in electricity
Angular starting is carried out under the power supply of machine voltage rating, that is, every phase winding of motor is by phase winding voltage ratingTimes
Starting, so that motor obtains maximum current starting to realize angular starting, after determining asynchronous machine start completion, according to star
Shape voltage rating and Rated motor frequency run so that every phase winding of asynchronous machine works under phase winding voltage rating, i.e., electric
Every phase winding of machine is run by specified phase winding voltage, although motor is at this time with angular connection access frequency converter, due to power supply
Line voltage decline, so that operational effect when motor accesses frequency converter with star connection is realized, so that the embodiment of the present invention makes
Frequency converter has angle star handoff functionality, angle star contactor in the prior art and peripheral circuit cost is eliminated, so that at the same time
Under the scene for needing reduced-voltage starting mode and high current Starting mode, is only realized by frequency converter, save cost and simplify
Operation, provides convenience.
That is, it will be understood by those skilled in the art that implement the method for the above embodiments be can be with
Relevant hardware is instructed to complete by program, which is stored in a storage medium, including some instructions are to make
It obtains an equipment (can be single-chip microcontroller, chip etc.) or processor (processor) executes side described in each embodiment of the application
The all or part of the steps of method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of angle star switching method, which is characterized in that be applied to frequency converter, and the asynchronous machine to connect with the frequency converter is pre-
First access up in an angular manner；The angle star switching method includes:
The converter parameter obtained according to the nameplate parameter of the asynchronous machine is stored in advance；The converter parameter includes at least
Angular voltage rating, star voltage rating and Rated motor frequency；
After receiving angular enabling signal, according to the angular voltage rating and Rated motor frequency operation for described different
Step motor carries out angular starting under the power supply of Rated motor voltage；
After determining the asynchronous machine start completion, according to the star voltage rating and the Rated motor frequency operation with
It works under phase winding voltage rating for every phase winding of the asynchronous machine.
2. star switching method in angle according to claim 1, which is characterized in that described according to the angular voltage rating and institute
The operation of Rated motor frequency is stated so that the asynchronous machine in angular starting, specifically includes under the power supply of Rated motor voltage:
Accelerate to accelerate to predeterminated frequency in duration default；
According to the angular voltage rating and the angular voltage-frequency of Rated motor frequency acquisition than curve, and according to reality output frequency
Rate exports relevant voltage to the asynchronous machine than curve according to the angular voltage-frequency.
3. star switching method in angle according to claim 2, which is characterized in that the converter parameter further includes angular default
Current limit ratio, frequency converter rated current and rated current of motor；It is described to run according to the angular voltage rating for institute
Asynchronous machine is stated under the power supply of Rated motor voltage in angular starting, further includes:
Angular current regulation value is received, and according to the angular current regulation value and the angular predetermined current limit ratio control pair
The maximum output current of the asynchronous machine；And/or further include:
Frequency converter overload values are calculated according to the actual motion electric current of the frequency converter rated current and the frequency converter detected,
And the working condition of the frequency converter is controlled according to the frequency converter overload values and the first default overloading threshold；
Motor overload value is calculated according to the actual motion electric current of the rated current of motor and the asynchronous machine detected；Root
The working condition of the asynchronous machine is controlled according to the motor overload value and the second default overloading threshold.
4. star switching method in angle according to claim 1, which is characterized in that described when the judgement asynchronous machine has started
Cheng Hou runs every phase winding for the asynchronous machine in phase winding according to the star voltage rating and Rated motor frequency
In working under voltage rating, specifically include:
When determining the asynchronous machine start completion, according to the star voltage rating and the Rated motor frequency acquisition star
Voltage-frequency compares curve；
Relevant voltage is exported to the asynchronous machine, for described than curve according to the star voltage-frequency according to actual output frequency
Every phase winding of asynchronous machine works under the phase winding voltage rating.
5. star switching method in angle according to claim 4, which is characterized in that the converter parameter further includes that star is default
Current limit, frequency converter rated current and rated current of motor；It is described to run according to the star voltage rating for institute
The every phase winding for stating asynchronous machine works under phase winding voltage rating, further includes:
Star current regulated value is received, and according to the star current regulated value and star predetermined current limit ratio control pair
The maximum output current of the asynchronous machine；And/or further include:
Frequency converter overload values are calculated according to the actual motion electric current of the frequency converter rated current and the frequency converter detected,
And the working condition of the frequency converter is controlled according to the frequency converter overload values and the first default overloading threshold；
Motor overload value is calculated according to the actual motion electric current of the rated current of motor and the asynchronous machine detected, and
The working condition of the asynchronous machine is controlled according to the motor overload value and the second default overloading threshold.
6. the angle star switching method according to claim 3 or 5, which is characterized in that the rated current of motor is the inscription
Rated current of motor in board parameterTimes.
7. star switching method in angle according to claim 1, which is characterized in that the nameplate parameter includes at least Rated motor
Voltage UNWith the Rated motor voltage UNCorresponding specified connection；When the specified connection is star connection, the angular volume
Constant voltage UpN1=UN, the star voltage rating
8. star switching method in angle according to claim 1, which is characterized in that described when the judgement asynchronous machine has started
Cheng Hou, specifically: after default starting duration reaches.
9. a kind of frequency converter characterized by comprising
At least one processor；And
The memory being connect at least one described processor communication；Wherein,
The memory is stored with the instruction that can be executed by least one described processor, and described instruction is by described at least one
It manages device to execute, so that at least one described processor is able to carry out the angle star switching side as described in any in claim 1 to 8
Method.
10. a kind of computer readable storage medium, is stored with computer program, which is characterized in that the computer program is located
Reason device realizes star switching method in angle described in any item of the claim 1 to 8 when executing.
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Cited By (1)
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| CN117559845A (en) * | 2024-01-09 | 2024-02-13 | 广州市百福电气设备有限公司 | Starting control method and system for water pump motor |
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