CN110011581A - A kind of suppressing method and system of asymmetric six phases alternating current generator common-mode noise - Google Patents
A kind of suppressing method and system of asymmetric six phases alternating current generator common-mode noise Download PDFInfo
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- CN110011581A CN110011581A CN201910080158.7A CN201910080158A CN110011581A CN 110011581 A CN110011581 A CN 110011581A CN 201910080158 A CN201910080158 A CN 201910080158A CN 110011581 A CN110011581 A CN 110011581A
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/22—Multiple windings; Windings for more than three phases
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/50—Vector control arrangements or methods not otherwise provided for in H02P21/00- H02P21/36
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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
- 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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
-
- 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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
- H02P27/085—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 using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses the suppressing methods and system of a kind of asymmetric six phases alternating current generator common-mode noise, by by sinusoidal pulse width modulation algorithm (the Sinusoidal PWM of conventional symmetrical, abbreviation SPWM) under six phase pulse-width signals carry out real-time phase shift, make the common-mode voltage for driving two sets of three-phase inverter output amplitudes of asymmetric six phases alternating current generator opposite, it is input to common-mode voltage total in asymmetric six phases alternating current generator to eliminate inverter, thus the common-mode noise for inhibiting asymmetric six-phase motor to generate；Meanwhile control method and system of the invention does not need to increase hardware, is only achieved that by improving software algorithm, and it is versatile, motor bearings can be protected, system reliability is improved.
Description
Technical field
The invention belongs to motor control technology fields, make an uproar more particularly, to a kind of asymmetric six phases alternating current generator common mode
The suppressing method and system of sound.
Background technique
Compared to three phase alternating current motor, the increase of capacity motor is may be implemented since the number of phases increases in asymmetric six-phase motor；Together
When asymmetric six-phase motor can eliminate in three-phase motor because of torque pulsation caused by 5,7 subharmonic, reduce the torque arteries and veins of motor
It is dynamic；In addition asymmetric six-phase motor has more control freedom degrees, it can be achieved that fault-tolerant operation of the motor under phase shortage and failure,
The reliability of raising system.Based on the above feature, asymmetric six phases alternating current generator is widely used in ship's electrical propulsion, aviation boat
The high-power field with high reliability request such as it and electric car.
Since the frequency control function of motor driven systems is realized by the high-speed switch of pulse modulation technology combination inverter,
The winding neutral point of motor is set to there is the common-mode voltage characterized by sequence of high frequency pulses.Common-mode voltage passes through machine winding and machine
Stray capacitance and motor ground connection between shell or bearing generate the common mode current of high frequency, so that the electromagnetic interference noise of system increases
Add, while can the components such as motor bearings be formed with lasting damage, and then shorten the service life of motor, is in motor driven
One of main problem.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of asymmetric six phases alternating current generator is total
The suppressing method of mode noise, it is intended to solve asymmetric six phases alternating current generator since there are common-mode voltages, cause system electromagnetic interference
Noise increases, and motor component is by lasting damage, and then the problem of lead to motor reduced service life.
To achieve the above object, the present invention provides a kind of suppressing method of asymmetric six phases alternating current generator common-mode noise,
The following steps are included:
(1) rotor position angle θ, d. c. voltage signal V are acquireddcAnd the driving current of the asymmetric six phases alternating current generator of driving
iabc、iuvw；
(2) according to the rotor position angle θ and the driving current iabc、iuvw, obtain the first three-phase under rest frame
Each phase reference voltage V of inverterabcWith each phase reference voltage V of the second three-phase inverteruvw；
(3) according to each phase reference voltage V of first three-phase inverterabc, each phase reference voltage of the second three-phase inverter
VuvwWith the d. c. voltage signal Vdc, obtain each mutually initial pulse-width signal G of first three-phase inverterabcWith described
Each mutually initial pulse-width signal G of two three-phase invertersuvw；
(4) section according to locating for the rotor position angle θ, respectively to each mutually initial pulsewidth of first three-phase inverter
Modulated signal GabcWith each mutually initial pulse-width signal G of second three-phase inverteruvwPhase shift is carried out, acquisition makes described first
The target pulse modulated signal PWM1-6 of three-phase inverter and the opposite common-mode voltage of the second three-phase inverter output amplitude；Its
Middle PWM1-3 is for controlling the first three-phase inverter switching tube, and PWM4-6 is for controlling the second three-phase inverter switch
Pipe.
Further, the division methods in section described in the step (4) are as follows:
Compare each mutually initial pulse-width signal G of first three-phase inverterabcDuty ratio size, obtain maximum, most
Small duty ratio is respectively dabc_maxAnd dabc_min；
Compare each mutually initial pulse-width signal G of second three-phase inverteruvwDuty ratio size, obtain maximum, most
Small duty ratio is respectively duvw_maxAnd duvw_min；
D will be metabc_max+duvw_min> 1 and duvw_max+dabc_min> 1, or meet dabc_max+duvw_min< 1 and duvw_max+
dabc_min< 1 rotor-position angular region is divided into same section.
Preferably, the division result in the section are as follows:
Further, the method for phase shift described in the step (4) are as follows:
By largest duty cycle or the smallest initial arteries and veins in any one three-phase inverter in section locating for the rotor position angle θ
Wide modulated signal remains unchanged, and obtains first aim pulse-width signal；
Staggeredly pair according to first three-phase inverter and each phase target pulse-width signal of second three-phase inverter
Disappear, while guaranteeing largest duty cycle or the non-conterminous principle of the smallest pulse-width signal, selects in another three-phase inverter
Non- maximum or non-minimum initial pulse-width signal, the target pulsewidth modulation for obtaining its rising edge after shifted with upper one
The failing edge of signal is aligned, and obtains second target pulse-width signal；
In the manner described above, respectively to the initial pulse-width signal G of each phase of first three-phase inverterabcWith described
Each mutually initial pulse-width signal G of two three-phase invertersuvwPhase shift is carried out, opens each three-phase inverter common-mode voltage each
The head and the tail state for closing the period keeps identical (000) or (111) zero vector state, to obtain target pulse modulated signal
PWM1-6。
Inhibit asymmetric six phases alternating current generator common-mode noise using a kind of of the above method the invention also provides a kind of
Drive system, comprising: inverter unit, position sampling unit, current sampling unit, voltage sampling unit and controller unit；
The inverter unit include the first three-phase inverter and the second three-phase inverter, first three-phase inverter and
Second three-phase inverter is connect with asymmetric six phases alternating current generator, for inverteing direct current to alternating current stream, is driven described non-
Symmetrical six phases alternating current generator work；
The input terminal of the position sampling unit is connect with the asymmetric six phases alternating current generator, described non-right for acquiring
Claim the rotor position angle θ of six phase alternating current generators；
The input terminal of the current sampling unit is connect with the output end of the inverter unit, for acquiring described in driving
Six phase ac current signal i of asymmetric six phases alternating current generator workabcAnd iuvw；
The input terminal of the voltage sampling unit is connect with the DC side positive and negative terminal of the inverter unit, for acquiring
State the d. c. voltage signal V of inverter unit DC sidedc；
The first input end of the controller unit is connect with the output end of the voltage sampling unit, the second input terminal with
The output end of the current sampling unit connects, and third input terminal is connect with the output end of the position sampling unit, is used for root
According to the rotor-position signal θ, d. c. voltage signal VdcWith six phase ac current signal iabc、iuvw, export target pulsewidth modulation
Signal controls the first three-phase inverter and the opposite common-mode voltage of the real-time output amplitude of the second three-phase inverter.
Further, two sets of stator winding of the asymmetric six phases alternating current generator are all made of star-like connection, while every set
Three winding fundamental wave potential 120 ° of electrical angles of mean difference of stator winding differ 30 ° of electrical angles, two sets of stators between double winding
The neutral point of winding can both keep connecting, and can also keep being not connected to；
The asymmetric six phases alternating current generator may include induction machine and permanent magnet synchronous motor etc., for turning electric energy
Turn to mechanical energy output.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can be realized following has
Beneficial effect:
(1) present invention is by carrying out pulse in the sector of each Vector modulation on the basis of traditional SPWM modulator approach
Phase shift, the common-mode voltage for keeping two sets of real-time output amplitudes of three-phase inverter opposite are input to asymmetric six phase to eliminate inverter
Total common-mode voltage in alternating current generator, to eliminate the common-mode noise that asymmetric six-phase motor generates.
(2) control method of the present invention does not need to increase hardware, is only achieved that by improving software algorithm, versatile,
Motor bearings can be protected, system reliability is improved.
Detailed description of the invention
Fig. 1 is the flow chart of CM Noise Cancellation of the invention；
Fig. 2 is that CM Noise Cancellation of the invention is related to the flow graph of signal；
Fig. 3 is the pwm signal waveform figure obtained according to traditional pulse width modulation algorithm；
Fig. 4 is the interval division figure of CM Noise Cancellation according to the invention；
Fig. 5-8 is the target pwm signal waveform figure obtained according to the CM Noise Cancellation of invention；
Fig. 9 is that the common-mode voltage that CM Noise Cancellation according to the invention generates is generated with according to conventional modulated algorithm
Common-mode voltage comparison diagram；
Figure 10 is that the common mode current that CM Noise Cancellation according to the invention generates is produced with according to conventional modulated algorithm
Raw common mode current comparison diagram；
Figure 11 is the physical composition schematic diagram of drive system according to the invention；
1 is inverter unit, and 2 be asymmetric six-phase motor, and 3 be position sampling unit, and 4 be current sampling unit, and 5 be electricity
Sampling unit is pressed, 6 be controller unit.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
The present invention provides the suppressing method and system of a kind of asymmetric six phases alternating current generator common-mode noise, its object is to
Inhibit the common-mode noise of asymmetric six phases AC motor system, protect motor bearings, improves system reliability.
With reference to Fig. 1, the suppressing method of the asymmetric six phases alternating current generator common-mode noise of one kind provided by the invention includes following
Step:
(1) each phase of the first three-phase inverter under rest frame is calculated by traditional space vector decoupling control method
Reference voltage and each phase of the second three-phase inverter reference voltage；
Specifically, with reference to Fig. 2, derivation is carried out to collected rotor position angle θ, asymmetric six phases alternating current generator is obtained and turns
The real-time angular speed w of son, by w and angular speed reference signal wrefIt is poor to make, and obtains angular speed error signal w_err, to w_errCarry out PI
Control, obtains q axis reference current iqref, d axis, z1Axis and z2Axis reference current idref, iz1refAnd iz2refIt can be according to actual needs
It is configured；
It acquires first three-phase inverter and the second three-phase inverter is currently used in the asymmetric six phases alternating current generator of driving
Six phase current ia、ib、ic、iu、ivAnd iw, six phase current is coordinately transformed, obtain d under rotating coordinate system,
q、z1And z2Axis actual current id、iq、iz1And iz2；
Specifically transform method can be realized by following transformation for mula:
Obtain the actual current id、iq、iz1And iz2With the reference current idref、iqref、iz1refAnd iz2refIt is corresponding
Difference signal id_err、iq_err、iz1_errAnd iz2_err, PI control is carried out to the difference signal respectively, obtains d axis, q axis, z1With
z2The reference voltage V of axisd、Vq、Vz1And Vz2；
To the reference voltage Vd、Vq、Vz1And Vz2It is coordinately transformed, obtains six phase reference voltages under rest frame
Va、Vb、Vc、Vu、Vv、Vw；
Specifically transform method can be realized by following formula:
(2) by traditional SPWM sinusoidal pulse width modulation algorithm obtain symmetrical original sine pulse-width signal Ga, Gb,
Gc, Gu, Gv and Gw；
Specifically, respectively by the six phases reference voltage divided by d. c. voltage signal VdcObtain the first three-phase inverter and
The normalization reference voltage is carried out amplitude with triangular carrier respectively by the normalization reference voltage of each phase of the second three-phase inverter
Compare, generate initial symmetrical sinusoidal pulse width modulation signal Ga, Gb, Gc, Gu, Gv and Gw as shown in Figure 3, wherein Ga, Gb,
Gc is the pulse for driving the first three-phase inverter switching tube action, and Gu, Gv and Gw are the second three-phase inverter switching tube of driving
The pulse of movement, Ucm1With Ucm2The common-mode voltage of respectively two sets of inverters output, it can be seen that two sets of inverters exported is total to
The real-time amplitude of mode voltage is on the contrary, common mode current can not be generated in asymmetric six phases alternating current generator.
(3) interval division is carried out to rotor position angle according to the duty ratio size of the original sine pulse-width signal；
Specifically, it in order to determine the principle and foundation of the interval division, needs to reach after clearly each phase pulse phase shifting
Effect and corresponding phase shift requirement:
Firstly, first three-phase inverter and the second three-phase inverter are required to retain (000) and (111) two null vectors
The switch state of amount separates the common-mode voltage of each three-phase inverter in the double winding neutral point of asymmetric six-phase motor
In the case of export more level states, realize phase voltage level state optimization, reduce the current ripples of phase current；
In addition, the common-mode voltage of each three-phase inverter keeps identical (000) in the head and the tail state of each switch periods
Or (111) zero vector state, it is ensured that the pulse initial state of all bridge arms is constant, judges that phase shift afterpulse originates shape to save
The process of state simplifies the complexity that method is realized；
Meet two above requirement, while guaranteeing first three-phase inverter and the second three-phase inverter common-mode voltage
In the case where offseting, the zero vector duty ratio of two sets of three-phase inverter common-mode voltages and two three-phase inverters can be determined
There are direct relations for pwm signal minimax duty ratio, therefore can be according to zero vector duty ratio and different phase pwm signal duties
The relationship demarcation interval of ratio；
Pass through the expression formula for each phase pwm signal duty ratio that sinusoidal pulse width modulation method obtains are as follows:
Wherein, da、db、dc、du、dv、dwFor the duty ratio size of each phase pwm signal, m is the index of modulation, and θ is rotor-position
Angle；
According to above-mentioned expression formula, the duty ratio size of more described Ga, Gb, Gc obtain PWM in the first three-phase inverter and believe
Number maximum, minimum duty cycle be respectively dabc_maxAnd dabc_min；The duty ratio size for comparing Gu, Gv and Gw, obtains the second three-phase
The maximum, minimum duty cycle of pwm signal are respectively d in inverteruvw_maxAnd duvw_min；
Compare relationship of the sum of the maximum, minimum duty cycle with 1 between two inverters；
Work as dabc_max+duvw_min> 1 and duvw_max+dabc_minWhen > 1, (000) null vector of the pwm signal of ABC phase after the phase shift
Measuring duty ratio must be 1-dabc_max, (111) zero vector duty ratio must be 1-duvw_max, and the pwm signal of UVW phase is after the phase shift
Two kinds of zero vector duty ratios and ABC phase are exactly the opposite；
Work as dabc_max+duvw_min< 1 and duvw_max+dabc_minWhen < 1, (000) null vector of the pwm signal of ABC phase after the phase shift
Measuring duty ratio must be duvw_min, (111) zero vector duty ratio must be dabc_min, and the pwm signal of UVW phase after the phase shift two kinds
Zero vector duty ratio and ABC phase are exactly the opposite；
It can be seen that the sum of maximum, minimum duty cycle is big with 1 between the first three-phase inverter and the second three-phase inverter
Small relationship can determine the duty ratio of two inverter output zero vectors, therefore can be used as the standard of demarcation interval；
The result of interval division is as shown in Figure 4:
Wherein, θ indicates the rotor position angle.
(4) section according to locating for rotor position angle carries out phase shift to the initial pulse-width signal, obtains target arteries and veins
Wide modulated signal makes first three-phase inverter and the opposite common-mode voltage of the second three-phase inverter output amplitude, to eliminate
The common-mode noise that asymmetric six phases alternating current generator generates.
Specifically, phase shift principle is as follows:
1) it drives the three-phase pulse signal (hereinafter referred to as: ABC three-phase pulse) of the first three-phase inverter switch motion and drives
Dynamic the and the three-phase pulse signal (hereinafter referred to as: UVW three-phase pulse) of three-phase inverter switch motion must be offseted staggeredly, if
There are the switches in same set of winding to offset, then cannot achieve the switch combination state of three-phase inverter output zero vector；
2) when the pwm signal of largest duty cycle is initial pulse in using any one three-phase inverter, two three-phase inversions
The pwm signal of largest duty cycle cannot be adjacent in device, such as the pulse signal that A phase is largest duty cycle in ABC three-phase pulse, U phase
For the pulse signal of largest duty cycle in three-phase pulse, then A phase cannot be adjacent with U phase；It accounts in any one three-phase inverter
When sky than the smallest pwm signal is initial pulse, the smallest pwm signal of duty ratio cannot be adjacent in two three-phase inverters, such as C
It is mutually the smallest pulse signal of duty ratio in ABC three-phase pulse, W phase is the smallest pulse signal of duty ratio in three-phase pulse, then C
It mutually cannot be adjacent with W phase；It is such as unsatisfactory for above-mentioned two requirement, the initial state that will lead to certain pwm signals becomes with rotor angle
Change, is unable to satisfy the state that two three-phase inverters always keep two kinds of zero vectors of output；
Fig. 5 is the target arteries and veins for obtain after phase shift to initial pulse-width signal according to mentioned above principle in first interval
Wide modulated signal schematic diagram, taking phase shift, steps are as follows:
A phase pwm signal Ga is remained unchanged to obtain target pulse-width signal PWM1 as the reference signal of phase shift；
Select the pwm signal Gv of V phase as second phase shift signal, mobile Gv makes the rising edge and PWM1 failing edge pair of Gv
Target pulse-width signal PWM5 is obtained together；
Mobile Gc makes the rising edge of Gc be aligned to obtain target pulse-width signal PWM3 with PWM5 failing edge；
Mobile Gu makes the rising edge of Gu be aligned to obtain target pulse-width signal PWM4 with PWM3 failing edge；
Mobile Gb makes the rising edge of Gb be aligned to obtain target pulse-width signal PWM2 with PWM4 failing edge；
Mobile Gw makes the rising edge of Gw be aligned to obtain target pulse-width signal PWM6 with PWM2 failing edge；
After above-mentioned phase shift system, it is ensured that two sets of inverters in the first sector common-mode voltage keep on the contrary, from
And inhibit the common-mode noise of asymmetric six-phase motor；
In addition there is also other phase shift systems, phase shift sequences as shown in Figure 6 are as follows: A-W-C-U-B-V-A in this section；Fig. 7
Shown in phase shift sequence are as follows: A-V-B-U-C-W-A；Phase shift sequence shown in Fig. 8 are as follows: A-W-B-U-C-V-A；Shown in Fig. 5-8
Same common mode inhibition effect may be implemented in target impulse signal.Phase shift principle is followed it is also theorized that more in other sectors
Kind phase shift system, realizes common mode inhibition effect.
Fig. 9 is the common mode that conventional modulated algorithm and common mode noise rejection algorithm proposed by the present invention are carried out under identical operating condition
Voltage-contrast, it can be seen that conventional modulated algorithm generates very big common-mode voltage in motor, and common mode proposed by the present invention is made an uproar
The elimination to the total common-mode voltage of motor may be implemented in sound restrainable algorithms.
Figure 10 is that being total to for general modulation algorithm and common mode noise rejection algorithm proposed by the present invention is carried out under identical operating condition
Mould current vs, it can be seen that conventional modulated algorithm can generate biggish common mode current in motor, and proposed by the present invention total
The elimination to the total common mode current of motor may be implemented in mode noise restrainable algorithms.
As shown in figure 11, the present invention also provides a kind of drive system of asymmetric six phases alternating current generator common-mode noise, packets
It includes: inverter unit 1, position sampling unit 3, current sampling unit 4, voltage sampling unit 5 and controller unit 6；
Inverter unit 1 includes the first three-phase inverter and the second three-phase inverter, first three-phase inverter and the
Two three-phase inverters are connect with asymmetric six phases alternating current generator 2, for inverteing direct current to alternating current stream, driving asymmetric six
Phase alternating current generator 2 works；
The input terminal of position sampling unit 3 is connect with asymmetric six phases alternating current generator 2, for acquiring asymmetric six phases exchange
The rotor position angle θ of motor 2；
The input terminal of current sampling unit 4 is connect with the output end of inverter unit 1, drives asymmetric six phase for acquiring
The six phase ac current signal i that alternating current generator 2 worksabcAnd iuvw；
The input terminal of voltage sampling unit 5 is connect with the DC side positive and negative terminal of inverter unit 1, for acquiring inverter list
The d. c. voltage signal V of first 1 DC sidedc；
The first input end of controller unit 6 is connect with the output end of voltage sampling unit 5, and the second input terminal is adopted with electric current
The output end of sample unit 4 connects, and third input terminal is connect with the output end of position sampling unit 3, for according to the rotor position
Confidence θ, d. c. voltage signal VdcWith six phase ac current signal iabc、iuvw, export target pulse-width signal, control first
Three-phase inverter and the opposite common-mode voltage of the real-time output amplitude of the second three-phase inverter.
Two sets of stator winding of asymmetric six phases alternating current generator 2 are all made of star-like connection, while the three of every set stator winding
A 120 ° of electrical angles of winding fundamental wave potential mean difference differ 30 ° of electrical angles, the neutral point of two sets of stator winding between double winding
Both it can keep connecting, can also keep being not connected to；
Asymmetric six phases alternating current generator 2 may include induction machine and permanent magnet synchronous motor etc., for converting electrical energy into
For mechanical energy output.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of suppressing method of asymmetric six phases alternating current generator common-mode noise, which comprises the following steps:
(1) rotor position angle θ, d. c. voltage signal V are acquireddcAnd the driving current i of the asymmetric six phases alternating current generator of drivingabc、
iuvw；
(2) according to the rotor position angle θ and the driving current iabc、iuvw, obtain the first three-phase inversion under rest frame
Each phase reference voltage V of deviceabcWith each phase reference voltage V of the second three-phase inverteruvw；
(3) according to each phase reference voltage V of first three-phase inverterabc, each phase reference voltage V of the second three-phase inverteruvwWith
The d. c. voltage signal Vdc, obtain each mutually initial pulse-width signal G of first three-phase inverterabcWith the described 2nd 3
Each mutually initial pulse-width signal G of phase inverteruvw；
(4) section according to locating for the rotor position angle θ, respectively to each mutually initial pulsewidth modulation of first three-phase inverter
Signal GabcWith each mutually initial pulse-width signal G of second three-phase inverteruvwPhase shift is carried out, acquisition makes first three-phase
The target pulse modulated signal PWM1-6 of inverter and the opposite common-mode voltage of the second three-phase inverter output amplitude；Wherein
PWM1-3 is for controlling the first three-phase inverter switching tube, and PWM4-6 is for controlling the second three-phase inverter switch
Pipe.
2. the suppressing method of the asymmetric six phases alternating current generator common-mode noise of one kind according to claim 1, which is characterized in that
The division methods in section described in the step (4) are as follows:
Compare each mutually initial pulse-width signal G of first three-phase inverterabcDuty ratio size, obtain maximum, minimum and account for
Sky is than being respectively dabc_maxAnd dabc_min；
Compare each mutually initial pulse-width signal G of second three-phase inverteruvwDuty ratio size, obtain maximum, minimum and account for
Sky is than being respectively duvw_maxAnd duvw_min；
D will be metabc_max+duvw_min> 1 and duvw_max+dabc_min> 1, or meet dabc_max+duvw_min< 1 and duvw_max+dabc_min<
1 rotor-position angular region is divided into same section.
3. the suppressing method of the asymmetric six phases alternating current generator common-mode noise of one kind according to claim 2, which is characterized in that
The division result in the section are as follows:
4. the suppressing method of the asymmetric six phases alternating current generator common-mode noise of one kind according to claim 2 or 3, feature exist
In the method for the phase shift are as follows:
By largest duty cycle in any one three-phase inverter in section locating for the rotor position angle θ or the smallest initial pulsewidth tune
Signal processed remains unchanged, and obtains first aim pulse-width signal；
It is staggeredly offseted according to first three-phase inverter and each phase target pulse-width signal of second three-phase inverter, together
When guarantee largest duty cycle or the non-conterminous principle of the smallest pulse-width signal, select non-maximum in another three-phase inverter
Or non-minimum initial pulse-width signal, the target pulse-width signal for obtaining its rising edge after shifted with upper one
Failing edge alignment, obtains second target pulse-width signal；
In the manner described above, respectively to the initial pulse-width signal G of each phase of first three-phase inverterabcWith the described 2nd 3
Each mutually initial pulse-width signal G of phase inverteruvwPhase shift is carried out, makes each three-phase inverter common-mode voltage in each switch week
The head and the tail state of phase keeps identical (000) or (111) zero vector state, to obtain the target pulse modulated signal
PWM1-6。
5. a kind of inhibit asymmetric six phases alternating current generator common-mode noise using a kind of of any one of claim 1-4 the method
Drive system characterized by comprising inverter unit (1), position sampling unit (3), current sampling unit (4), voltage are adopted
Sample unit (5) and controller unit (6)；
Inverter unit (1) includes the first three-phase inverter and the second three-phase inverter, first three-phase inverter and second
Three-phase inverter is connect with asymmetric six phases alternating current generator, for inverteing direct current to alternating current stream, drives asymmetric six phase
Alternating current generator (2) work；
The input terminal of position sampling unit (3) is connect with asymmetric six phases alternating current generator (2), for acquiring asymmetric six phases exchange
The rotor position angle θ of motor (2)；
The input terminal of current sampling unit (4) is connect with the output end of inverter unit (1), drives asymmetric six phase for acquiring
Six phase ac current signal i of alternating current generator (2) workabcAnd iuvw；
The input terminal of voltage sampling unit (5) is connect with the DC side positive and negative terminal of inverter unit (1), for acquiring inverter list
The d. c. voltage signal V of first (1) DC sidedc；
The first input end of controller unit (6) is connect with the output end of voltage sampling unit (5), and the second input terminal is adopted with electric current
The output end of sample unit (4) connects, and third input terminal is connect with the output end of position sampling unit (3), for being turned according to described
Sub- position signal θ, d. c. voltage signal VdcWith six phase ac current signal iabc、iuvw, export target pulse-width signal, control
First three-phase inverter and the opposite common-mode voltage of the real-time output amplitude of the second three-phase inverter.
6. a kind of drive system for inhibiting asymmetric six phases alternating current generator common-mode noise according to claim 5, feature
It is, two sets of stator winding of the asymmetric six phases alternating current generator are all made of star-like connection, while the three of every set stator winding
A 120 ° of electrical angles of winding fundamental wave potential mean difference differ 30 ° of electrical angles, the neutral point of two sets of stator winding between double winding
Both it can keep connecting, can also keep being not connected to.
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