CN105577065B - Brushless dual-feed motor asynchronous starting method and apparatus - Google Patents
Brushless dual-feed motor asynchronous starting method and apparatus Download PDFInfo
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Abstract
The present invention relates to a kind of brushless dual-feed motor asynchronous starting method and device, the method includes：Soft start is carried out to frequency converter；Disconnect power supply of the power winding power supply to power winding of motor, and by power winding short circuit；The output of frequency converter is controlled by control winding current closed-loop mode, carries out the soft start of motor；When motor speed is close to nature synchronous rotational speed and when stablizing, the short circuit state of power winding is released；Using the power supply of control winding access as reference, by the control to frequency converter, the amplitude and phase of the induced voltage of power winding are adjusted, makes the voltage magnitude and Phase synchronization of its power supply gradually accessed with control winding；By power winding access power winding power supply, motor asynchronous operation state is made to enter synchronous operation state；The frequency converter is controlled so that the rotating speed of motor reaches the natural synchronous rotational speed, completion start-up course.Power winding and control winding electric current when brushless dual-feed motor starts can be greatly reduced in the present invention.
Description
Technical field
The present invention relates to brushless dual-feed motor fields, more particularly to a kind of brushless dual-feed motor asynchronous starting device, go back
It is related to a kind of brushless dual-feed motor asynchronous starting method.
Background technology
Brushless dual-feed motor is a kind of New-type electric machine.Brushless dual-feed motor develops from cascade machine, fixed by two sets
Sub- winding (being respectively power winding and control winding) adds the rotor of special designing to realize brushless structure, so as to improve motor
Reliability.Brushless dual-feed motor can both be used as generator to run, and can also be used as motor running.As motor running
When, involve starting up problem.The startup of brushless dual-feed motor refer to motor from rotating speed be 0 to rotating speed be motor nature synchronous speed nN's
Process.
Traditional brushless double-fed motor Starting mode is divided into synchronous averaging and asynchronous starting.Synchronous averaging is brushless double feed
Two sets of stator winding of motor add driving source simultaneously, and motor shows synchronous motor characteristic at this time.Specifically power winding is processed
Frequency power encourages, and control winding adds variable-frequency power sources to encourage, and control winding frequency increases to 0Hz from -50Hz, and corresponding motor rotating speed is just
N can be increased to from 0N, so as to start motor.The problem of synchronous averaging is to need the frequency converter of total power, this and brushless double feed
Motor can use the original intention of portion capacity Frequency Converter Control to disagree, so the Starting mode of mainstream is asynchronous starting.
Asynchronous starting refers to that two sets of stator winding of brushless dual-feed motor only have a set of winding to add driving source, and another set of winding is short
It connects.Motor meets asynchronous motor properties at this time.Traditional high-power brushless double-fed motor asynchronous starting uses control winding string
The quick resistance of connection frequency or the method for becoming resistance, and small-power brushless double-fed motor is taken directly in control winding plus short circuit connects
The method of tentaculum.
Traditional brushless dual-feed motor asynchronous starting method, the current peak of motor is larger, and high current can generate power supply
Impact, while loss can be generated inside circuit and motor and causes fever.
Invention content
Based on this, it is necessary to provide a kind of brushless dual-feed motor asynchronous starting side of winding current when can reduce startup
Method.
A kind of brushless dual-feed motor asynchronous starting method, including：The control winding of frequency converter and motor is accessed into power supply, it is right
Frequency converter carries out soft start；After the completion of frequency converter soft start, power supply of the power winding power supply of motor to power winding is disconnected, and
By power winding short circuit；The output of frequency converter is controlled by control winding current closed-loop mode, carries out the soft start of motor；Work as electricity
Machine rotating speed releases the short circuit state of the power winding close to nature synchronous rotational speed and when stablizing；The electricity accessed with control winding
Source is reference, by the control to the frequency converter, adjusts the amplitude and phase of the induced voltage of the power winding, make its by
The voltage magnitude and Phase synchronization of the power supply gradually accessed with control winding；After to be synchronized, by the power winding access power around
Group power supply makes motor enter the synchronous operation state of two groups of power supplys while effect by the asynchronous operation state that one group of power supply acts on；
The frequency converter is controlled so that the rotating speed of motor reaches the natural synchronous rotational speed, completion start-up course.
The induced voltage amplitude and phase of the adjustment power winding in one of the embodiments, makes it gradually
The step of amplitude and Phase synchronization of the power supply accessed with control winding is using brushless double-fed acc power winding flux linkage orientation
Vector control method controlled.
The vector control method of the flux linkage orientation includes the following steps in one of the embodiments,：By control winding
The three-phase voltage of power supply and power the winding sensing of access transforms to two-phase stationary coordinate system by three-phase static coordinate system；Control is obtained
The voltage magnitude of the voltage of the power supply of winding access processed and the induced voltage of power winding under the two-phase stationary coordinate system | up
|、|ug| and phase angle θp、θg；The three-phase current of control winding is transformed into two-phase rotating coordinate system by three-phase static coordinate system,
The two-phase rotating coordinate system includes d axis and q axis, obtains current component i of the control winding on d axis and q axiscd、icq；According to
Voltage magnitude | up|、|ug| obtain given value of current value of the control winding on d axisAccording to electric current of the control winding on d axis
Set-pointWith current component icdVoltage set-point of the control winding on d axis is obtainedAccording to phase angle θp、θgIt is controlled
Given value of current value of the winding processed on q axisAccording to given value of current value of the control winding on q axisWith current component icqIt asks
Go out voltage set-point of the control winding on q axisAccording to power winding number of pole-pairs pp, control winding number of pole-pairs pc, motor turn
Sub- angular position thetarAnd phase angle θpControl winding is obtained and transforms to rotation slip angle θ in power winding rotating coordinate systemc；Root
According toθcThe three-phase voltage u of control winding is obtainedca、ucb、uccAnd export, control frequency converter makes it by control winding
Three-phase voltage is adjusted to uca、ucb、ucc。
Described the step of soft start is carried out to frequency converter in one of the embodiments, including soft start resistance is connected
It accesses between the frequency converter and the power supply of control winding access, detects the DC bus-bar voltage of the frequency converter, when detecting
When the DC bus-bar voltage reaches predetermined voltage range, by soft start resistive short, the step of completing frequency converter soft start.
The control frequency converter causes the rotating speed of motor to reach described naturally synchronous turn in one of the embodiments,
The step of speed is that frequency converter is controlled gradually to reduce output frequency to be actuated to continuous current excitation until output.
It there is a need to and a kind of brushless dual-feed motor asynchronous starting device is provided.
A kind of brushless dual-feed motor asynchronous starting device, including frequency converter, further include first contactor, third contactor,
Soft starting circuit, power winding short-circuit and control unit；The frequency converter is connected to control winding power input and electricity
Between the control winding of machine, the first contactor and soft starting circuit series connection are followed by the control winding power input
Between end and frequency converter, the third contactor is connected between the power winding of motor and the power winding power supply of motor, described
Power winding short-circuit is connected between the power winding and third contactor and can short circuit institute under the control of the control unit
State power winding；Described control unit is used to the frequency converter and control winding accessing power supply, and soft start is carried out to frequency converter,
Power supply of the power winding power supply to power winding is then turned off, and by power winding short circuit, then passes through control winding current closed-loop
Mode controls the output of frequency converter, carries out the soft start of motor, when detecting motor speed close to nature synchronous rotational speed and stabilization
When, the short circuit state of the power winding is released, using the power supply of control winding access as reference, passes through the control to the frequency converter
System adjusts the amplitude and phase of the induced voltage of the power winding, makes the voltage of its power supply gradually accessed with control winding
Amplitude and Phase synchronization by the power winding access power winding power supply after synchronizing, make what motor was acted on by one group of power supply
Asynchronous operation state enters the synchronous operation state that two groups of power supplys act on simultaneously, and the frequency converter is finally controlled to cause turning for motor
Speed reaches the natural synchronous rotational speed, completes start-up course.
By the three-phase short circuit of power winding when the power winding short-circuit includes being closed in one of the embodiments,
The 4th contactor together, the soft starting circuit include soft start resistance and connect second contact at soft start resistance both ends
Device.
The frequency converter includes full-bridge uncontrollable rectifier circuit, full bridge inverter, derailing switch in one of the embodiments,
Part and bus capacitor；The full-bridge uncontrollable rectifier circuit connects the first contactor, described in the full bridge inverter connection
Control winding, the bus capacitor is connected to the busbar both ends between full-bridge uncontrollable rectifier circuit and full bridge inverter, for obtaining
Take DC bus-bar voltage, the input and output side of the switching device respectively with the input terminal of the full bridge inverter and output
End connection, the control terminal of the switching device are connect with described control unit, and the switching device is controlled by described control unit
Duty ratio.
Also series connection is connected to filter inductance between the soft starting circuit and frequency converter in one of the embodiments,.
Described control unit is the arrow using brushless double-fed acc power winding flux linkage orientation in one of the embodiments,
Amount control method, which is adjusted the voltage magnitude of the sensing of the power winding and phase, makes itself and line lock.
Power when brushless dual-feed motor starts can be greatly reduced in above-mentioned brushless dual-feed motor asynchronous starting method and apparatus
Winding and control winding electric current.
Description of the drawings
Fig. 1 is the structure diagram of brushless dual-feed motor asynchronous starting device in an embodiment；
Fig. 2 is the flow chart of brushless dual-feed motor asynchronous starting method in an embodiment；
Fig. 3 is brushless double-fed acc power winding Grid-connected Control Strategy block diagram in an embodiment；
Fig. 4 is the structure diagram of brushless dual-feed motor asynchronous starting device in another embodiment；
When Fig. 5 starts for a kind of direct short circuit of brushless dual-feed motor control winding of traditional 30kW power two sets of stators around
The current waveform of group；
Fig. 6 is when the brushless dual-feed motor of 30kW power is started by the brushless dual-feed motor asynchronous starting method of the present invention
Two sets of stator winding current waveforms；
Fig. 7 is power winding induced electricity during being started by the brushless dual-feed motor asynchronous starting method of the present invention
Voltage waveform of the kinetic potential with network voltage when synchronous；
Fig. 8 is rotor speed waveform when motor is started by the brushless dual-feed motor asynchronous starting method of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the structure diagram of brushless dual-feed motor asynchronous starting device in an embodiment, including brushless dual-feed motor
10 (including control windings 12 and power winding 14), frequency converter 20, first contactor 110, third contactor 140, soft start electricity
Road 120, power winding short-circuit 130 and control unit (not showing in Fig. 1).Frequency converter 20 is connected to control winding power input
(usually connecing alternating current, that is, as network voltage input terminal) is held between the control winding 12 of motor.First contactor 110
And the series connection of soft starting circuit 120 is followed by between control winding power input and frequency converter 20.Third contactor 140 is connected to electricity
The power winding power supply of the power winding 14 of machine and motor (power winding power supply can be power frequency supply, can also connect alternating current) it
Between.Power winding short-circuit 130 is connected between power winding 14 and third contactor 140, and can be controlled by control unit short
Connect power winding 14.
Fig. 2 is the flow chart of brushless dual-feed motor asynchronous starting method in an embodiment, is included the following steps：
S210, power supply is accessed by the control winding of frequency converter and motor, and soft start is carried out to frequency converter.
In the present embodiment, first contactor 110 is closed, third contactor 140 disconnects, power winding short-circuit
130, not by 14 short circuit of power winding, the soft start of frequency converter are realized by soft starting circuit 120.
S220, disconnects power supply of the power winding power supply of motor to power winding, and by power winding short circuit.
In the present embodiment, after the completion of the soft start of frequency converter, by power winding short-circuit 130 by power winding
140 short circuits proceed by the startup of motor.
S230 controls the output of frequency converter by control winding current closed-loop mode, carries out the soft start of motor.
After short circuit power winding 14, frequency converter 20 can control motor 10 as starting control common asynchronous moter
Start.Control frequency converter 20 exports, with regard to that can achieve the purpose that control two sets of stator winding (control winding and power winding) electric currents,
Realize the soft start of motor.In the present embodiment, opening for brushless dual-feed motor is controlled using control winding current closed-loop mode
Streaming current can improve the startability of motor.
S240 when motor speed is close to nature synchronous rotational speed and when stablizing, releases the short circuit state of power winding.
When motor speed reaches the natural synchronous rotational speed n of motorNA% and after the duration reaches b milliseconds, judge it
Close to nature synchronous rotational speed and stabilization.For wherein a% for one close to 1 empirical value, b is equally an empirical value.1/3 pair of pole
Brushless dual-feed motor embodiment in, natural synchronous rotational speed nNFor 750rpm, rotating speed maintains 400 milliseconds in more than 740rpm,
Motor speed is considered as close to nature synchronous rotational speed and stabilization.
S250 is adjusted the amplitude and phase of the induced voltage of power winding by frequency converter, makes it gradually and line lock.
The power supply accessed using control winding 12 passes through the control to frequency converter 20, the sense of adjustment power winding 14 as reference
The amplitude and phase of voltage are answered, makes the voltage magnitude of its power supply (i.e. power grid) gradually accessed with control winding 12 and phase same
Step.In the present embodiment, be using brushless double-fed acc power winding flux linkage orientation vector control method to frequency converter 20 into
Row control.
Fig. 3 is brushless double-fed acc power winding Grid-connected Control Strategy block diagram in an embodiment.Process is controlled to it below
It illustrates, includes the following steps：
The three-phase voltage that power grid and power winding 14 sense is transformed into the static seat of two-phase by three-phase static coordinate system (abc)
Mark system (α β).U in Fig. 3pa、upb、upc, uga、ugb、ugc, uca、ucb、uccPower winding 14, power grid, control winding 12 are represented respectively
Three-phase voltage.upα、upβAnd ugα、ugβRepresent that power winding voltages and network voltage are transformed to by three-phase static coordinate system respectively
Component of voltage after two-phase stationary coordinate system.
The voltage of power grid and voltage magnitude of the induced voltage under two-phase stationary coordinate system of power winding 14 is obtained | up|、
|ug| and phase angle θp、θg.Wherein phase angle θ of the induced voltage of power winding 14 under two-phase stationary coordinate systempBe pass through by
upαAnd upβInput phaselocked loop (PLL) obtains, the phase angle θ of the voltage of power grid under two-phase stationary coordinate systemgIt is by by ugαWith
ugβInput phaselocked loop obtains.
The three-phase current of control winding 12 is transformed into two-phase rotating coordinate system (dq) by three-phase static coordinate system (abc),
ica、icb、iccAnd icd、icqRepresent that 12 three-phase current of control winding transforms to two cordic phase rotators by three-phase static coordinate system respectively
Current component after system.
According to voltage magnitude | up|、|ug| obtain given value of current value of the control winding 12 on d axisSpecifically incite somebody to action | up
|-|ug| it is obtained after inputting proportional and integral controller (PI) again
According to given value of current value of the control winding 12 on d axisWith current component icdControl winding 12 is obtained on d axis
Voltage set-pointSpecifically willIt is obtained after inputting proportional and integral controller again
According to phase angle θp、θgObtain given value of current value of the control winding 12 on q axisSpecifically θp-θgRatio is inputted again
It is obtained after example integral controller
According to given value of current value of the control winding 12 on q axisWith current component icqControl winding is obtained on q axis
Voltage set-pointSpecifically willIt is obtained after inputting proportional and integral controller again
According to power winding number of pole-pairs pp, control winding number of pole-pairs pc, motor rotor position angle θrAnd phase angle θpIt is obtained
Control winding 12 transforms to the rotation slip angle θ in 14 rotating coordinate system of power windingc。θc=θp-(pp+pc)*θr。
According toθcThe three-phase voltage u of control winding is obtainedca、ucb、uccAnd export, control frequency converter 20 makes it
The three-phase voltage of control winding 12 is adjusted to uca、ucb、ucc。
Using power winding flux linkage orientation vector controlled, in the main excitation of control winding and the main excitation switching of power winding,
The amplitude and phase of power winding induced electromotive force are controlled, dash current when reduction power winding is grid-connected effectively reduces work(
Rush of current when rate winding is grid-connected.Fig. 7 is motor by power in above-mentioned brushless dual-feed motor asynchronous starting method start-up course
Voltage waveform (abscissa be time, unit be second) of the winding induced electromotive force with network voltage when synchronous, passes through above-mentioned control
Strategy is controlled the amplitude and phase of power winding induced electromotive force, effectively reduce power winding it is grid-connected when electric current punching
It hits.
Power winding is accessed power supply, motor is made to enter synchronous operation state by asynchronous operation state by S260.
After the amplitude of the induced voltage of power winding 14 and phase angle are synchronous with network voltage, third contactor 140 is closed,
By 14 access power winding power supply of power winding, motor 10 is made to enter two groups of power supplys by the asynchronous operation state that one group of power supply acts on
The synchronous operation state of effect simultaneously.
S270, control frequency converter cause the rotating speed of motor to reach nature synchronous rotational speed, complete start-up course.
In the present embodiment, 20 exportable continuous current excitation of frequency converter, after motor 10 enters synchronous operation state, control becomes
Frequency device 20 gradually reduces output frequency, and until exporting continuous current excitation, motor 10 just operates in nature synchronous speed n at this timeN, started
Journey terminates.
When Fig. 5 starts for a kind of direct short circuit of brushless dual-feed motor control winding of traditional 30kW power two sets of stators around
The current waveform (abscissa is the time, and unit is the second) of group, in motor start-up procedure, the current peak of power winding is in 120A
Left and right is 5-6 times of no-load current, and the current peak of control winding is in 100A or so.So big electric current can generate power supply
Impact, while loss can be generated inside circuit and motor and causes fever.And the brushless dual-feed motor that Fig. 6 is 30kW power is by upper
Two sets of stator winding current waveforms when brushless dual-feed motor asynchronous starting method starts are stated, short circuit direct with control winding starts
The amplitude of difference, control winding electric current and power winding current is controlled in 30A and 20A or so respectively after electric motor starting, several
It is the size level of no-load current.
Rotor speed waveform when Fig. 8 is started for motor by above-mentioned brushless dual-feed motor asynchronous starting method, can see
Very steady to entire start-up course rotating speed, only in control winding excitation and the switching of power winding energization, (step S260) has one
Point fluctuation.
Referring to Fig. 4, soft starting circuit 120 includes soft start resistance R in one of the embodiments, and connection soft start is electric
Hinder the second contactor KM2 at R both ends.Step S210 is to disconnect second contactor KM2, soft start resistance R is accessed circuit, so
The DC bus-bar voltage Udc of frequency converter 20 is detected afterwards, when detecting that DC bus-bar voltage reaches predetermined voltage range, is closed the
The step of two contactor KM2 are short-circuit by soft start resistance R, completion 20 soft start of frequency converter.The predetermined voltage range is a warp
Value is tested, is to decide that reach predetermined voltage range more than 450V in one of the embodiments.
Brushless dual-feed motor asynchronous starting method, the control unit of brushless dual-feed motor asynchronous starting device is described above
Function be for whole device to be controlled to perform the above method, i.e. control unit for frequency converter 20 and control winding 12 to be connect
Enter power supply, soft start carried out to frequency converter 20, is then turned off power supply of the power winding power supply to power winding 14, and by power around
14 short circuits are organized, then the output of frequency converter 20 is controlled by control winding current closed-loop mode, the soft start of motor 10 is carried out, works as inspection
When measuring motor speed close to nature synchronous rotational speed and stablizing, the short circuit state of power winding 14 is released, is connect with control winding 12
The power supply entered is reference, and by the control to frequency converter 20, the amplitude and phase of the induced voltage of adjustment power winding 14 make it
The voltage magnitude and Phase synchronization of the power supply gradually accessed with control winding 12, it is to be synchronized later by 14 access power of power winding
Winding power supply makes motor 10 enter two groups of power supplys while the synchronous operation shape of effect by the asynchronous operation state that one group of power supply acts on
State finally controls frequency converter 20 so that the rotating speed of motor 10 reaches the natural synchronous rotational speed, completion start-up course.
Fig. 4 is the structure diagram of brushless dual-feed motor asynchronous starting device in another embodiment, and control is omitted in figure
Winding and power winding.In this embodiment, the three-phase short circuit of power winding is existed when power winding short-circuit 130 is and is closed
The 4th contactor KM4 together, soft starting circuit 120 include soft start resistance R and the second of connection soft start resistance both ends and connect
Tentaculum KM2.
In the embodiment shown in fig. 4, frequency converter 20 includes full-bridge uncontrollable rectifier circuit VR, full bridge inverter VI, switch
Device VT0 and bus capacitor C.Full-bridge uncontrollable rectifier circuit VR connections first contactor KM1, full bridge inverter VI connection control
Winding, bus capacitor C are connected to the busbar both ends between full-bridge uncontrollable rectifier circuit VR and full bridge inverter VI, straight for obtaining
Flow busbar voltage Udc.Input terminal and the output terminal input with full bridge inverter VI respectively after switching device VT0 series resistances R0
End is connected with output terminal, and the control terminal of switching device VT0 is connect with control unit, by control unit control switching device VT0's
Duty ratio.
In the embodiment shown in fig. 4, it also connects between soft starting circuit 120 and frequency converter 20 and is connected to filter inductance L, it can be with
Improve the current waveform of 20 grid side of frequency converter, improve the power factor of grid side.
Above-mentioned brushless dual-feed motor asynchronous starting device, can be greatly reduced brushless dual-feed motor start when power winding and
Control winding electric current improves startability, realizes the soft start of motor, effectively reduces the cost and volume of control device.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of brushless dual-feed motor asynchronous starting method, including：
The control winding of frequency converter and motor is accessed into power supply, soft start is carried out to frequency converter；
After the completion of frequency converter soft start, power supply of the power winding power supply of motor to power winding is disconnected, and power winding is short
It connects；
The output of frequency converter is controlled by control winding current closed-loop mode, carries out the soft start of motor；
When motor speed is close to nature synchronous rotational speed and when stablizing, the short circuit state of the power winding is released；
Using the power supply of control winding access as reference, by the control to the frequency converter, the sensing of the power winding is adjusted
The amplitude and phase of voltage make the voltage magnitude and Phase synchronization of its power supply gradually accessed with control winding；
After to be synchronized, by the power winding access power winding power supply, the asynchronous operation shape that motor is made to be acted on by one group of power supply
State enters the synchronous operation state that two groups of power supplys act on simultaneously；
The frequency converter is controlled so that the rotating speed of motor reaches the natural synchronous rotational speed, completion start-up course；
The induced voltage amplitude and phase of the adjustment power winding make the width of its power supply gradually accessed with control winding
The step of value and Phase synchronization, is controlled using the vector control method of brushless double-fed acc power winding flux linkage orientation；
The vector control method of the flux linkage orientation includes the following steps：
It is quiet that the three-phase voltage of the power supply of control winding access and the sensing of power winding by three-phase static coordinate system is transformed into two-phase
Only coordinate system；
Be obtained power winding induced voltage and control winding access power supply voltage under the two-phase stationary coordinate system
Voltage magnitude | up|、|ug| and phase angle θp、θg；
The three-phase current of control winding is transformed into two-phase rotating coordinate system, two cordic phase rotator by three-phase static coordinate system
System includes d axis and q axis, obtains current component i of the control winding on d axis and q axiscd、icq；
According to voltage magnitude | up|、|ug| obtain given value of current value of the control winding on d axis
According to given value of current value of the control winding on d axisWith current component icdBe obtained voltage of the control winding on d axis to
Definite value
According to phase angle θp、θgObtain given value of current value of the control winding on q axis
According to given value of current value of the control winding on q axisWith current component icqBe obtained voltage of the control winding on q axis to
Definite value
According to phase angle θp, power winding number of pole-pairs pp, control winding number of pole-pairs pcAnd motor rotor position angle θrControl is obtained
Winding transforms to the rotation slip angle θ in power winding rotating coordinate systemc；
According toθcThe three-phase voltage u of control winding is obtainedca、ucb、uccAnd export, control frequency converter makes it will control
The three-phase voltage of winding is adjusted to uca、ucb、ucc。
2. brushless dual-feed motor asynchronous starting method according to claim 1, which is characterized in that described to be carried out to frequency converter
The step of soft start, including soft start resistance series connection is entered between the frequency converter and the power supply of control winding access, detection
The DC bus-bar voltage of the frequency converter, when detecting that the DC bus-bar voltage reaches predetermined voltage range, by soft start
The step of resistive short, completion frequency converter soft start.
3. brushless dual-feed motor asynchronous starting method according to claim 1, which is characterized in that the control frequency conversion
The step of device causes the rotating speed of motor to reach the natural synchronous rotational speed is that control frequency converter gradually reduces output frequency until defeated
What is gone out is actuated to continuous current excitation.
4. a kind of brushless dual-feed motor asynchronous starting device, including frequency converter, which is characterized in that further include first contactor,
Three contactors, soft starting circuit, power winding short-circuit and control unit；It is defeated that the frequency converter is connected to control winding power supply
Enter between end and the control winding of motor, the first contactor and soft starting circuit series connection are followed by the control winding
Between power input and frequency converter, the third contactor be connected to motor power winding and motor power winding power supply it
Between, the power winding short-circuit is connected between the power winding and third contactor and can be under the control of the control unit
Power winding described in short circuit；
Described control unit is used to the frequency converter and control winding accessing power supply, carries out soft start to frequency converter, then breaks
Power supply of the power winding power supply to power winding is opened, and by power winding short circuit, then pass through control winding current closed-loop mode control
The output of frequency converter processed carries out the soft start of motor, when detecting motor speed close to nature synchronous rotational speed and stablizing, releases
The short circuit state of the power winding using the power supply of control winding access as reference, passes through the control to the frequency converter, adjustment
The amplitude and phase of the induced voltage of the power winding make the voltage magnitude and phase of its power supply gradually accessed with control winding
Bit synchronization, by the power winding access power winding power supply after synchronizing, the asynchronous operation that motor is made to be acted on by one group of power supply
State enters the synchronous operation state that two groups of power supplys act on simultaneously, finally controls the frequency converter so that the rotating speed of motor reaches institute
Nature synchronous rotational speed is stated, completes start-up course；
Described control unit be adjusted using the vector control method of brushless double-fed acc power winding flux linkage orientation it is described
The voltage magnitude and phase of the sensing of power winding make itself and line lock；
The vector control method of the flux linkage orientation includes the following steps：
It is quiet that the three-phase voltage of the power supply of control winding access and the sensing of power winding by three-phase static coordinate system is transformed into two-phase
Only coordinate system；
Be obtained power winding induced voltage and control winding access power supply voltage under the two-phase stationary coordinate system
Voltage magnitude | up|、|ug| and phase angle θp、θg；
The three-phase current of control winding is transformed into two-phase rotating coordinate system, two cordic phase rotator by three-phase static coordinate system
System includes d axis and q axis, obtains current component i of the control winding on d axis and q axiscd、icq；
According to voltage magnitude | up|、|ug| obtain given value of current value of the control winding on d axis
According to given value of current value of the control winding on d axisWith current component icdBe obtained voltage of the control winding on d axis to
Definite value
According to phase angle θp、θgObtain given value of current value of the control winding on q axis
According to given value of current value of the control winding on q axisWith current component icqBe obtained voltage of the control winding on q axis to
Definite value
According to phase angle θp, power winding number of pole-pairs pp, control winding number of pole-pairs pcAnd motor rotor position angle θrControl is obtained
Winding transforms to the rotation slip angle θ in power winding rotating coordinate systemc；
According toθcThe three-phase voltage u of control winding is obtainedca、ucb、uccAnd export, control frequency converter makes it will control
The three-phase voltage of winding is adjusted to uca、ucb、ucc。
5. brushless dual-feed motor asynchronous starting device according to claim 4, which is characterized in that the power winding short circuit
Circuit includes the 4th contactor for being shorted together the three-phase of power winding when being closed, and the soft starting circuit includes soft start
Resistance and the second contactor at connection soft start resistance both ends.
6. brushless dual-feed motor asynchronous starting device according to claim 4, which is characterized in that the frequency converter includes complete
Bridge uncontrollable rectifier circuit, full bridge inverter, switching device and bus capacitor；Full-bridge uncontrollable rectifier circuit connection described the
One contactor, the full bridge inverter connect the control winding, the bus capacitor be connected to full-bridge uncontrollable rectifier circuit and
Busbar both ends between full bridge inverter, for obtaining DC bus-bar voltage, the input and output side point of the switching device
It is not connect with the input terminal of the full bridge inverter and output terminal, control terminal and the described control unit of the switching device connect
It connects, the duty ratio of the switching device is controlled by described control unit.
7. brushless dual-feed motor asynchronous starting device according to claim 4, which is characterized in that the soft starting circuit and
Also series connection is connected to filter inductance between frequency converter.
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| CN106685271B (en) * | 2016-08-05 | 2019-05-21 | 湖南利能科技股份有限公司 | The operating status control method of brushless dual-feed motor |
| CN106329577B (en) * | 2016-09-05 | 2019-02-12 | 易事特集团股份有限公司 | The grid-connection control system of brushless dual-feed motor |
| CN106410754B (en) * | 2016-10-21 | 2019-01-08 | 湖南利能科技股份有限公司 | A kind of method for detecting open phase and system |
| CN106953573A (en) * | 2017-03-13 | 2017-07-14 | 湖南利能科技股份有限公司 | A kind of Speed identification method of brushless dual-feed motor |
| CN109193567B (en) * | 2018-09-30 | 2020-10-02 | 深圳市汇川技术股份有限公司 | Ground short circuit protection method, motor controller and computer readable storage medium |
| CN113014159A (en) * | 2019-12-19 | 2021-06-22 | 丹东山川电机有限公司 | Motor starting method for testing performance of TYCD self-starting permanent magnet synchronous motor |
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