CN106452261A - BCPWM based phase current reconstruction method and device - Google Patents
BCPWM based phase current reconstruction method and device Download PDFInfo
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- CN106452261A CN106452261A CN201610911298.0A CN201610911298A CN106452261A CN 106452261 A CN106452261 A CN 106452261A CN 201610911298 A CN201610911298 A CN 201610911298A CN 106452261 A CN106452261 A CN 106452261A
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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
Abstract
The invention discloses a BCPWM based phase current reconstruction method and device. A BCPWM manner is used, when certain one phase of current cannot be sampled, a valid vector of fixed time is inserted into a zero vector segment, and after duty ratio compensation, two phases of currents corresponding to the valid vector are used to reconstruct three phases of currents; and when two phases of currents cannot be sampled, in two adjacent PWM periods, the valid vector of fixed time is inserted into a phase A and a phase B in turn, the duty ratio is kept unchanged, the current value under the effect that the vector is inserted in each PWM period is sampled, the other phase of current is kept in the sampling value of last time, and current reconstruction is carried out. The reconstruction device comprises a BCPWM module, a PWM signal regulation module, a DC sampling module and a current reconstruction module. Via the device and method, the three phases of currents of a motor can be reconstructed in the whole vector space, adverse influence caused by inaccurate reconstruction current due to short action time of the valid vector can be overcome, vector distortion is avoided, and the reliability is improved greatly.
Description
Technical field
The present invention relates to motor control technologies field, particularly a kind of method for reconstructing phase current based on BCPWM modulation
With device.
Background technology
In high performance frequency-changing control system, the phase current sensing of motor is a key link, directly affects
Performance to whole control system.In the frequency converter timing product for civilian use relatively focused on by cost, the sample unit of electric current is to be
Heavier burden in system cost, more common at present to current sample method be to be sampled by DC bus current detecting acquisition
Motor phase current.
In the dc bus side of converter, connect single sampling resistor R can reconstruct three-phase current, as shown in Figure 1.Cause
Finally all electrical network U can be returned to by dc bus for three-phase currentdc, therefore, the electric current accurate response of dc bus side goes out three-phase
The change of electric current.Three-phase current can be reconstructed by certain control technology, that is, saved cost and improve reliability again.Single
The problem of resistance sampling maximum is sector borders and low-key system, can only adopt an effective vector, or even one is all adopted not
Arrive.For region-wide phase current reconstruction problem, a lot of scholars have been had in depth to study it, it is proposed that Duo Zhongyou
The solution of the effect method of Observable area phase current reconstruction and strategy by no means.Wherein, the representational method of comparison is：Sampling modification
Method, cycle outer sampling method and PWM phase-shifting method.
Sampling modification method due to using retention value replace can not detected current value, inevitably led to reconstruct current wave
Shape distortion to a certain extent；Cycle outer sampling method, at any time can essence without the locus of consideration voltage vector
True completes reconstruct to phase current, but because the sampling pulse outside there is PWM cycle, so as to will inevitably lead to motor
The higher hamonic wave that electric current is produced, causes motor torque to produce high-frequency fluctuation；PWM phase-shifting method is exactly to be exported using asymmetrical PWM,
Application problem of the single electric current Sampling techniques on motor although can be solved to a certain extent, but controlled in motor low speed
When control easily produce the problems such as voltage vector distortion is larger, and current harmonics incrementss are larger, realizing to motor three-phase electricity
Flow and full-time quarter, gamut are reconstructed Shortcomings.
Space vector PWM due to its have modulation index high (than high 15%) of SPWM, it is easy to the features such as Digital Realization,
It is used widely in the control of three-phase inverter.By zero vector method of salary distribution difference can be divided into continuous space vector PWM and
Discontinuous space vector PWM, wherein BCPWM are a certain in discontinuous vector PWM mutually to switch situation about being failure to actuate.BCPWM is modulated
In high modulation index and ovennodulation operation, performance is more preferable.The zero vector of BCPWM is distributed in the two ends of PWM cycle, unobservable
Area is substantially little than SVPWM, and its conventional method is PWM phase shift, exports asymmetrical PWM ripple, and Fig. 2 is BCPWM using phase-shifting method weight
Unobservable area's figure during structure, wherein (a) are figure at sector borders, and (b) is low modulation area figure.By as can be seen that phase shift in Fig. 2
Method can not realize region-wide electric current reconstructing, and have harmonic wave generation.
Content of the invention
It is an object of the invention to provide a kind of method for reconstructing phase current based on BCPWM modulation and device, complete to realize
Moment region-wide phase current reconstruction, is kept substantially each phase dutycycle using BCPWM modulation system and keeps constant.
The technical solution for realizing the object of the invention is：
On the one hand, the present invention provides a kind of method for reconstructing phase current based on BCPWM modulation, using BCPWM modulation system,
In a PWM cycle, it is handled as follows according to current sample situation：
If a certain phase current cannot be sampled, it is T in the zero vector section middle insertion timewEffective vector, and keep accounting for
Empty than constant, the corresponding electric current of biphase effective vector of sampling is reconstructing three-phase current；Wherein time TwBelieve for DC bus current
Number rise stabilization time sample conversion time sum when sampling with AD；
If two phase currents cannot all be sampled, in two neighboring PWM cycle, will it be T the timewEffective vector insert in turn
Entering in A phase and B phase, and keep dutycycle constant, the current value of effective vector is inserted in each PWM cycle of sampling and another
Phase current remains the sampled value of last time, carries out electric current reconstructing；
Otherwise, phase current sampling and reconstruct are directly carried out.
On the other hand, the present invention provides a kind of phase current reconstruction device based on BCPWM modulation, and described device includes
BCPWM modulation module, pwm signal adjustment module, DC current sampling module and electric current reconstructing module：
The BCPWM modulation module, for calculating the duty of BCPWM modulation according to the space voltage vector of the motor
Than after modulating BCPWM, the dutycycle of three-phase sends the pwm signal adjustment module to, also believes effective vector region
Number send electric current reconstructing module to；
The pwm signal adjustment module, for dutycycle and default electric current according to the BCPWM modulation for obtaining
Sampling window time Tw, PWM waveform corresponding biphase comparison point time of the uplink and downlink half period of each PWM cycle is calculated, and
The switch closure for generating control PWM inverter or the first control signal for disconnecting and control DC current sampling module are to direct current
The second control signal that bus current is sampled, sends corresponding first reconstruction signal to the electric current reconstructing module；
The DC current sampling module, for carrying out to DC bus current according to second control signal for receiving
Sampling, and the sampled value of DC bus current is sent to the electric current reconstructing module；
The electric current reconstructing module, in the switch periods of BCPWM modulation, when first reconstruction signal is received,
According to pwm signal adjustment module send effective vector region signal, and the DC current sampling module send
DC bus current sampled value, is calculated the third phase electric current of the motor.
Compared with prior art, its remarkable advantage is the present invention：(1) worked using BCPWM modulation system, mutually electric one
Flat clamp, switching device is failure to actuate, and only two groups switches of each PWM cycle need action, are effectively reduced on-off times；And
And its zero vector is all with V111Form be entirely insertable in the middle of PWM cycle, can the larger range of insertion for realizing fixed vector, have
The non-viewing area area that the minimizing reconstruct electric current of effect brings；(2) using the electric current reconstructing method of fixed vector insertion, substantially
Do not change the dutycycle of each phase, overcome effective vector action time shorter when the reconstruct inaccurate adverse effect that brings of electric current,
Improve the performance of single resistance sampling, it is to avoid vector infidelity, reliability is greatly enhanced.
Description of the drawings
Fig. 1 is the converter topological structure schematic diagram of single resistance sampling method for reconstructing phase current.
Fig. 2 is unobservable area's figure when BCPWM is reconstructed using phase-shifting method, and wherein (a) is figure at sector borders, and (b) is
Low modulation area figure.
Fig. 3 is the BCPWM oscillogram after the vector of the embodiment of the present invention is inserted and compensated, and wherein (a) is
When oscillogram, (b) isWhen oscillogram, (c) is When oscillogram, (d) isWhen oscillogram.
Fig. 4 is the schematic device for modulating method for reconstructing phase current based on BCPWM of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the present invention.
In conjunction with the converter topological structure of the single resistance sampling method for reconstructing phase current shown in Fig. 1, the present invention is based on BCPWM
The method for reconstructing phase current of modulation, using BCPWM modulation system, in a PWM cycle, according to current sample situation carry out as
Lower process：
If a certain phase current cannot be sampled, it is T in the zero vector section middle insertion timewEffective vector, and keep accounting for
Empty than constant, the corresponding electric current of biphase effective vector of sampling is reconstructing three-phase current；Wherein time TwBelieve for DC bus current
Number rise stabilization time sample conversion time sum when sampling with AD；
If two phase currents cannot all be sampled, in two neighboring PWM cycle, will it be T the timewEffective vector insert in turn
Entering in A phase and B phase, and keep dutycycle constant, the current value of effective vector is inserted in each PWM cycle of sampling and another
Phase current remains the sampled value of last time, carries out electric current reconstructing；
Otherwise, phase current sampling and reconstruct are directly carried out.
Further, the BCPWM modulation system, i.e. bus clamp PWM (BCPWM) modulation system, a phase level pincers
Position, switching device is failure to actuate, and only two groups switches of each carrier cycle need action." 0 " is used in the upper brachium pontis conducting of PWM inverter
Represent, lower brachium pontis conducting " 1 " expression；Zero vector is all with V111Form be entirely insertable in the middle of PWM carrier cycle so that one
Only biphase switch motion in carrier cycle, the phase PWM ripple of largest duty cycle is switched in PWM cycle is failure to actuate.
Further, the PWM waveform of the up half period of each PWM cycle, corresponding biphase comparison point time bag
Include the larger time T that compares of dutycyclemaxA compare time T smaller with dutymid, wherein Tmax＞ Tmid；Under corresponding
The row half period PWM waveform biphase comparison point time includes the larger time T ' that compares of dutycyclemax, duty is smaller compares
Point time T 'mid, wherein T 'max＜ T 'mid；
Effectively vector T action time1、T2Respectively：The T1Or T2Less than time TwWhen, zero
In the middle of vector section, the insertion time is TwEffective vector, then producing ratio is compared with time point Tx1、Tx2, wherein
TsFor switch periods.
Further, the T1Or T2Less than time TwWhen, it is T in the zero vector section middle insertion timewEffective vector,
Specific as follows：
Two effective vector T action time are calculated respectively according to the corresponding biphase comparison point time1、T2, judge up half
Whether effective vector action time in cycle is less than current sample widow time Tw：
(A) ifAnd
1) whenWhen, larger for dutycycle one mutually all being put height, and T is added at thiswEffective vector, it is not necessary to
Dutycycle is compensated, and is sampled to meeting the corresponding phase current of effective vector of sampling request respectively, is reconstructed three-phase current；
2) whenWhen, then the time is inserted for T in the centre position of the larger phase of dutycyclewEffective vector, respectively
The corresponding phase current of effective vector to meeting sampling request is sampled, and reconstructs three-phase current；
(B) ifAndThen is inserted for T the time in the centre position of a dutycycle less phasewEffective arrow
Amount, samples to meeting the corresponding phase current of effective vector of sampling request respectively, reconstructs three-phase current；
(C) ifAndThen in two neighboring PWM cycle, will it be T the timewEffective vector insert in turn
To in A phase and B phase, and sample to inserting the corresponding phase current of effective vector in each PWM cycle, and another phase current
The sampled value of last time is remained, reconstructs three-phase current.
Further, the T1Or T2Less than time TwWhen, it is T in the zero vector section middle insertion timewEffective vector, with
When to insert the time be TwEffective vector corresponding to the PWM ripple of phase carry out dutycycle compensation, that is, respectively in the phase PWM ripple
High level two ends extend
As shown in figure 3, after the effective vector of insertion, need to inserting that effective vector is corresponding mutually to carry out dutycycle compensation, also
It is to increase at the high level two ends of the phase PWM ripple respectivelyAction time.In Fig. 3, (a) is When
Oscillogram, (b) isWhen oscillogram, (c) isWhen oscillogram, (d) isWhen oscillogram.
Then two current sample points in each PWM cycle are calculated, needs to judge whether effective vector action time is little
In current sample widow time Tw, sampled point T can be calculatedsample1、Tsample2, specific as follows：
(A) ifAndIn Tsample1、Tsample2When
Quarter is sampled, and is obtained biphase phase current and can be calculated third phase phase current；
(B) ifAndIn Tsample1、Tsample2Moment is adopted
Sample, obtains biphase phase current and can calculate third phase phase current；
(C) ifAnd
1) whenWhen,In Tsample1、Tsample2Moment is sampled, and obtains two
Phase phase current can calculate third phase phase current；
2) whenWhen,In Tsample1、Tsample2Moment is adopted
Sample, obtains biphase phase current and can calculate third phase phase current；
(D) ifAnd
In (1) first PWM cycle, in A phaseInstance sample electric current to ia, in another phase current holding
Secondary sampled value is ib=ibold, calculate third phase electric current；
In (2) second PWM cycle, in B phaseInstance sample electric current to ib, in another phase current holding
Secondary sampled value is ia=iaold, calculate third phase electric current；
As shown in figure 4, the phase current reconstruction device that the present invention is modulated based on BCPWM, believes including BCPWM modulation module, PWM
Number adjustment module, DC current sampling module and electric current reconstructing module.
The BCPWM modulation module, for calculating the duty of BCPWM modulation according to the space voltage vector of the motor
Than after modulating BCPWM, the dutycycle of three-phase sends the pwm signal adjustment module to, also believes effective vector region
Number send electric current reconstructing module to；
The pwm signal adjustment module, for dutycycle and default electric current according to the BCPWM modulation for obtaining
Sampling window time Tw, PWM waveform corresponding biphase comparison point time of the uplink and downlink half period of each PWM cycle is calculated, and
The switch closure for generating control PWM inverter or the first control signal for disconnecting and control DC current sampling module are to direct current
The second control signal that bus current is sampled, sends corresponding first reconstruction signal to the electric current reconstructing module；
The DC current sampling module, for carrying out to DC bus current according to second control signal for receiving
Sampling, and the sampled value of DC bus current is sent to the electric current reconstructing module；
The electric current reconstructing module, in the switch periods of BCPWM modulation, when first reconstruction signal is received,
According to pwm signal adjustment module send effective vector region signal, and the DC current sampling module send
DC bus current sampled value, is calculated the third phase electric current of the motor.
Further, the pwm signal adjustment module generates control PWM inverter switch closure or the first control for disconnecting
Signal processed：First according to the action time of effective vector, judge whether to need to insert effective vector, if desired, then calculate PWM week
In phase, the uplink and downlink half period inserts corresponding two comparison point T of effective vectorx1、Tx2With biphase comparison point T after compensationmax1、
Tmid1、Tmax2、Tmid2；If need not, the PWM waveform corresponding two for directly calculating the uplink and downlink half period in PWM cycle is compared
Relatively point Tmax、Tmid、Tm'ax、Tm'id；Specific as follows：
Effectively vector T action time1、T2RespectivelyTsFor switch periods, TwFor direct current
Sample conversion time sum when bus current signal rising stabilization time is sampled with AD, then：
(A) ifAnd
1) whenWhen,
2) whenWhen
(B) ifAndThen is inserted for T the time in the centre position of a dutycycle less phasewEffective
Vector, the up half period comparison point time in PWM cycleDescending half
The comparison point time in cycle
(C) ifAndThen in two neighboring PWM cycle, will it be T the timewEffective vector insert in turn
To in A phase and B phase, the period 1 inserts vector in A phase, then have The
Two cycles insert vector in B phase, then have
According to the calculated comparison point time T of above-mentioned judgementmax1、Tmid1、Tmax2、Tmid2, result of calculation is carried with triangle
Bob relatively exports PWM inverter switch closure or the first control signal for disconnecting.
Further, the pwm signal adjustment module is generated and controls DC current sampling module to enter DC bus current
Second control signal of row sampling, specially：
(A) ifAndFirst sampled point timeSecond sampled point time
(B) ifAndFirst sampled point timeSecond sampled point time
(C) ifAnd
1) whenWhen, the first sampled point timeSecond sampled point time
2) whenWhen, the first sampled point timeSecond sampled point time
(D) ifAnd
1) in first PWM cycle, in the second sampled point time of A phaseSample rate current obtains ia, Ling Yixiang
It is i that electric current keeps the sampled value of last timeb=ibold；
2) in second PWM cycle, in the first sampled point time of B phaseSample rate current obtains ib, Ling Yixiang
It is i that electric current keeps the sampled value of last timea=iaold.
The pwm signal adjustment module by control DC current sampling module DC bus current is sampled second
Control signal is sent to DC current sampling module.
Further, the electric current reconstructing module also includes to judge computing unit, receives the first reconstruction signal for working as
When, according to the biphase sample rate current for receiving, corresponding effective vector region information, corresponding reconstruct mode is selected, is calculated
Third phase phase current is obtained, realizes three-phase current reconstruct；
When needing to insert effective vector, if a certain phase current cannot be sampled, it is T in the zero vector section middle insertion timew
Effective vector, ifDirectly the dutycycle of that larger for dutycycle phase being changed into 1 does not carry out dutycycle compensation, no
Then keep dutycycle constant, the corresponding electric current of biphase effective vector of sampling is reconstructing three-phase current；If two phase currents all cannot
Sampling, in two neighboring PWM cycle, will be T the timewEffective vector be inserted in A phase and B phase in turn, and keep dutycycle
Constant, the current value of vector is inserted in each PWM cycle of sampling, and another phase current remains the sampled value of last time, enters
Row electric current reconstructing；Phase current sampling and reconstruct are otherwise directly carried out；Specially：
(A) ifAndCan according to the biphase sample rate current for receiving and corresponding effective vector region
Third phase phase current is calculated, realizes three-phase current reconstruct；
(B) ifAndPermissible according to the biphase phase current for receiving and corresponding effective vector region
Third phase phase current is calculated, realizes three-phase current reconstruct；
(C) ifAndPermissible according to the biphase phase current for receiving and corresponding effective vector region
Third phase phase current is calculated, realizes three-phase current reconstruct；
(D) ifAnd
In (1) first PWM cycle, in A phaseInstance sample electric current to ia, in another phase current holding
Secondary sampled value is ib=ibold, calculate third phase electric current；
In (2) second PWM cycle, in B phaseInstance sample electric current to ib, in another phase current holding
Secondary sampled value is ia=iaold, calculate third phase electric current.
In sum, the present invention is kept substantially each phase dutycycle using BCPWM modulation system and keeps constant, has overcome
When effect vector action time is shorter, the inaccurate adverse effect that brings of reconstruct electric current, especially at low modulation area, it is to avoid vector
Distortion, reliability is greatly enhanced.
Claims (9)
1. a kind of method for reconstructing phase current based on BCPWM modulation, it is characterised in that using BCPWM modulation system, at
In PWM cycle, it is handled as follows according to current sample situation：
If a certain phase current cannot be sampled, it is T in the zero vector section middle insertion timewEffective vector, and keep dutycycle not
Become, the corresponding electric current of biphase effective vector of sampling is reconstructing three-phase current；Wherein time TwRise for DC bus current signal
Sample conversion time sum when stabilization time is sampled with AD；
If two phase currents cannot all be sampled, in two neighboring PWM cycle, will it be T the timewEffective vector be inserted into A in turn
Mutually and in B phase, and keep dutycycle constant, insert the current value of effective vector in each PWM cycle of sampling and another mutually electricity
Stream remains the sampled value of last time, carries out electric current reconstructing；
Otherwise, phase current sampling and reconstruct are directly carried out.
2. the method for reconstructing phase current based on BCPWM modulation according to claim 1, it is characterised in that the BCPWM is adjusted
Mode processed, i.e. bus clamp PWM mode, and a phase level clamping, switching device are failure to actuate, and each carrier cycle only has two
Group switch needs action；The upper brachium pontis conducting of PWM inverter is represented with 0, and lower brachium pontis conducting is represented with 1；Zero vector is all with V111's
Form is entirely insertable in the middle of PWM carrier cycle so that only biphase switch motion, the phase of largest duty cycle in a carrier cycle
PWM ripple is switched in PWM cycle and is failure to actuate.
3. the method for reconstructing phase current based on BCPWM modulation according to claim 1 and 2, it is characterised in that described each
The PWM waveform of the up half period of PWM cycle, the corresponding biphase comparison point time includes that dutycycle is larger and compares a time
TmaxA compare time T smaller with dutymid, wherein Tmax＞ Tmid；The biphase comparison point of corresponding descending half period PWM waveform
Time includes the larger time T that compares of dutycyclem'ax, the smaller time T that compares of dutym'id, wherein Tm'ax＜ Tm'id；
Effectively vector T action time1、T2Respectively：The T1Or T2Less than time TwWhen, in null vector
In the middle of amount section, the insertion time is TwEffective vector, then producing ratio is compared with time point Tx1、Tx2, wherein
TsFor switch periods.
4. the method for reconstructing phase current based on BCPWM modulation according to claim 3, it is characterised in that the T1Or T2Little
In time TwWhen, it is T in the zero vector section middle insertion timewEffective vector, specific as follows：
(A) ifAnd
1) whenWhen, larger for dutycycle one mutually all being put height, and T is added at thiswEffective vector, it is not necessary to duty
Than compensation, sample to meeting the corresponding phase current of effective vector of sampling request respectively, reconstruct three-phase current；
2) whenWhen, then the time is inserted for T in the centre position of the larger phase of dutycyclewEffective vector, respectively to full
The corresponding phase current of effective vector of sufficient sampling request is sampled, and reconstructs three-phase current；
(B) ifAndThen is inserted for T the time in the centre position of a dutycycle less phasewEffective vector,
Sample to meeting the corresponding phase current of effective vector of sampling request respectively, reconstruct three-phase current；
(C) ifAndThen in two neighboring PWM cycle, will it be T the timewEffective vector be inserted into A phase in turn
In B phase, and sample to the corresponding phase current of effective vector is inserted in each PWM cycle, and another phase current keeps
For last sampled value, three-phase current is reconstructed.
5. the method for reconstructing phase current based on BCPWM modulation according to claim 4, it is characterised in that the T1Or T2Little
In time TwWhen, it is T in the zero vector section middle insertion timewEffective vector, while to insert the time be TwEffective vector institute
The PWM ripple of corresponding phase carries out dutycycle compensation, that is, extends at the high level two ends of the phase PWM ripple respectively
6. a kind of phase current reconstruction device based on BCPWM modulation, it is characterised in that described device include BCPWM modulation module,
Pwm signal adjustment module, DC current sampling module and electric current reconstructing module：
The BCPWM modulation module, for calculating the dutycycle of BCPWM modulation according to the space voltage vector of the motor,
After BCPWM is modulated, the dutycycle of three-phase sends the pwm signal adjustment module to, also passes effective vector region signal
Give electric current reconstructing module；
The pwm signal adjustment module, for dutycycle and default current sample according to the BCPWM modulation for obtaining
Widow time Tw, PWM waveform corresponding biphase comparison point time of the uplink and downlink half period of each PWM cycle is calculated, and is generated
The switch closure or the first control signal for disconnecting of control PWM inverter and control DC current sampling module are to dc bus
The second control signal that electric current is sampled, sends corresponding first reconstruction signal to the electric current reconstructing module；
The DC current sampling module, for adopting to DC bus current according to second control signal for receiving
Sample, and the sampled value of DC bus current is sent to the electric current reconstructing module；
The electric current reconstructing module, in the switch periods of BCPWM modulation, when first reconstruction signal is received, according to
Effective vector region signal that pwm signal adjustment module sends, and the direct current that the DC current sampling module sends
Bus current sampled value, is calculated the third phase electric current of the motor.
7. the phase current reconstruction device based on BCPWM modulation according to claim 6, it is characterised in that the pwm signal
Adjustment module generates control PWM inverter switch closure or the first control signal for disconnecting：First according to the work of effective vector
With the time, judge whether to need to insert effective vector, if desired, then calculate uplink and downlink half period insertion in PWM cycle and effectively swear
Measure corresponding two comparison point Tx1、Tx2With biphase comparison point T after compensationmax1、Tmid1、Tmax2、Tmid2；If need not, directly
Corresponding biphase comparison point T of the PWM waveform of uplink and downlink half period in calculating PWM cyclemax、Tmid、Tm'ax、Tm'id；Specifically such as
Under：
Effectively vector T action time1、T2RespectivelyTsFor switch periods, TwFor dc bus
Sample conversion time sum when current signal rising stabilization time is sampled with AD, then：
(A) ifAnd
1) whenWhen,
2) whenWhen
(B) ifAndThen is inserted for T the time in the centre position of a dutycycle less phasewEffective vector,
The up half period comparison point time in PWM cycleDescending half period ratio
Relatively put the time
(C) ifAndThen in two neighboring PWM cycle, will it be T the timewEffective vector be inserted into A phase in turn
In B phase, the period 1 inserts vector in A phase, then have Second round
Vector is inserted in B phase, then have
According to the calculated comparison point time T of above-mentioned judgementmax1、Tmid1、Tmax2、Tmid2, by result of calculation and triangular carrier ratio
Relatively output PWM inverter switch closure or the first control signal for disconnecting.
8. the phase current reconstruction device based on BCPWM modulation according to claim 7, it is characterised in that the pwm signal
Adjustment module generates the second control signal that control DC current sampling module is sampled to DC bus current, specially：
(A) ifAndFirst sampled point timeSecond sampled point time
(B) ifAndFirst sampled point timeSecond sampled point time
(C) ifAnd
1) whenWhen, the first sampled point timeSecond sampled point time
2) whenWhen, the first sampled point timeSecond sampled point time
(D) ifAnd
1) in first PWM cycle, in the second sampled point time of A phaseSample rate current obtains ia, another phase current
The sampled value for being kept for last time is ib=ibold；
2) in second PWM cycle, in the first sampled point time of B phaseSample rate current obtains ib, another phase current
The sampled value for being kept for last time is ia=iaold.
9. the phase current reconstruction device based on BCPWM modulation according to claim 8, it is characterised in that the electric current weight
Structure module also includes to judge computing unit, for when the first reconstruction signal is received, according to the biphase sample rate current for receiving, right
The effective vector region information that answers, selects corresponding reconstruct mode, is calculated third phase phase current, realizes three-phase current
Reconstruct；
When needing to insert effective vector, if a certain phase current cannot be sampled, it is T in the zero vector section middle insertion timewEffective
Vector, ifDirectly the dutycycle of that larger for dutycycle phase being changed into 1 does not carry out dutycycle compensation, otherwise keeps
Dutycycle is constant, and the corresponding electric current of biphase effective vector of sampling is reconstructing three-phase current；If two phase currents cannot all be sampled, phase
In adjacent two PWM cycle, will it be T the timewEffective vector be inserted in A phase and B phase in turn, and keep dutycycle constant, adopt
The current value of vector is inserted in each PWM cycle of sample, and another phase current remains the sampled value of last time, carries out electric current weight
Structure；Phase current sampling and reconstruct are otherwise directly carried out.
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| CN107300633A (en) * | 2017-08-23 | 2017-10-27 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Current source type variable frequency device line voltage observation procedure, apparatus and system |
| CN108712130A (en) * | 2018-06-15 | 2018-10-26 | Tcl空调器(中山)有限公司 | Single resistor current sampling transposition control method, device, equipment and storage medium |
| CN109347397A (en) * | 2018-12-13 | 2019-02-15 | 株洲易力达机电有限公司 | The current of electric method of sampling and system based on three resistance of three-phase drive bridge lower bridge arm |
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| CN113671241A (en) * | 2021-07-22 | 2021-11-19 | 上海新时达电气股份有限公司 | Frequency multiplication single resistance current sampling method and device thereof |
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| CN107300633A (en) * | 2017-08-23 | 2017-10-27 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Current source type variable frequency device line voltage observation procedure, apparatus and system |
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| CN111190056B (en) * | 2020-01-08 | 2022-01-07 | 西安理工大学 | Online estimation method for inductance parameter of LC alternating current filter of power converter |
| CN111190056A (en) * | 2020-01-08 | 2020-05-22 | 西安理工大学 | Online estimation method for inductance parameter of LC alternating current filter of power converter |
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| CN111769776A (en) * | 2020-06-30 | 2020-10-13 | 中科芯集成电路有限公司 | Current reconstruction system and method for hub motor controller |
| CN111769776B (en) * | 2020-06-30 | 2023-04-28 | 中科芯集成电路有限公司 | Current reconstruction system and method for hub motor controller |
| CN112436750A (en) * | 2020-10-09 | 2021-03-02 | 杭州士兰微电子股份有限公司 | Control method and control circuit of inverter |
| CN112436749A (en) * | 2020-10-09 | 2021-03-02 | 杭州士兰微电子股份有限公司 | Control method and control circuit of inverter |
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| CN112436750B (en) * | 2020-10-09 | 2022-04-19 | 杭州士兰微电子股份有限公司 | Control method and control circuit of inverter |
| CN113671241A (en) * | 2021-07-22 | 2021-11-19 | 上海新时达电气股份有限公司 | Frequency multiplication single resistance current sampling method and device thereof |
| CN113687126A (en) * | 2021-07-22 | 2021-11-23 | 上海新时达电气股份有限公司 | Single-resistor current sampling method and device |
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