CN107370350A - A kind of accurate Forecasting Methodology of current ripples based on unipolarity one circle control - Google Patents

A kind of accurate Forecasting Methodology of current ripples based on unipolarity one circle control Download PDF

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CN107370350A
CN107370350A CN201710610156.5A CN201710610156A CN107370350A CN 107370350 A CN107370350 A CN 107370350A CN 201710610156 A CN201710610156 A CN 201710610156A CN 107370350 A CN107370350 A CN 107370350A
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current
peak
value
electric current
ripples
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CN107370350B (en
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何家希
彭聪
李克翔
蔡凯文
邓智泉
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of accurate Forecasting Methodology of the current ripples based on unipolarity one circle control, this method is based on the unipolarity one circle control strategy applied to magnetic suspension bearing close power amplifier, by the current tracking situation for analyzing each cycle, according to the polarity of electric current initial value error, the situation of dividing carries out the non-constant compensation of fundamental wave and current error initial value compensation, so as to accurately predict current ripples peak-to-peak value.Ripple Forecasting Methodology proposed by the present invention, compared to traditional Forecasting Methodology that current ripples are produced using voltage alternating component, it is accurate to that can be predicted in the case of different current first harmonics frequencies and amplitude, especially precision of prediction advantage becomes apparent under low current ripple occasion, moreover it is possible to equally has reference significance to the ripple prediction under different current-modulation modes.

Description

A kind of accurate Forecasting Methodology of current ripples based on unipolarity one circle control
Technical field
The present invention relates to a kind of accurate Forecasting Methodology of the current ripples based on unipolarity one circle control, belong to power conversion The current-modulation technical field of device.
Background technology
Power amplifier is the important execution unit of magnetic suspension bearing control system, is being controlled according to the output signal of controller Corresponding electric current is produced in winding processed, so as to produce certain suspending power, so that rotor stability is suspended in equilbrium position.Magnetic Control strategy used in bearing close power amplifier, mainly there are pulsewidth modulation, stagnant ring to compare and sample the control modes such as holding, wherein stagnant Ring, which compares and sampled, keeps control mode to be used for simulating control, and pulse width modulation controlled mode is suitable for digital control.Tradition Pulse width modulation controlled strategy, be all to be controlled under fixed switching frequency.In order to reduce current ripples it is necessary to set height to open The problem of closing frequency, thus bringing is that switching loss is big, EMI problems are serious and heat dissipation design is difficult.
VFC based on output current ripple, it is to select output current ripple to pass through reality as VFC foundation When predict the current ripples of each switch periods, so as to changing switch periods under the requirement for meeting output current ripple.It is domestic Outer scholar deployed VFC research to motor three-phase PWM inverter, photovoltaic combining inverter etc., but VFC is in magnetic axis Not yet applied on bearing switch power amplifier, research is less.
One-cycle control is a kind of non-linear big signal PWM control theories, has control accuracy height, fast response time The features such as, controlled suitable for magnetic bearing switch power amplifier.Under unipolarity one circle control, power amplifier output current ripple is small, but, it is existing Have in technology, the Forecasting Methodology that current ripples are produced using voltage alternating component can not Accurate Prediction ripple peak-to-peak value.
The content of the invention
To solve the above problems, the present invention is on the basis of magnetic suspension bearing close power amplifier unipolarity one circle control Accurate Prediction current ripples, a kind of accurate Forecasting Methodology of current ripples based on unipolarity one circle control of proposition.The electric current The accurate Forecasting Methodology of ripple, it is accurate predicted current ripple, it is contemplated that fundamental wave is non-constant and electric current initial value error the two factors, And it is non-constant to fundamental wave and electric current initial value error establishes compensation model, so as to obtain accurate current ripples prediction.The prediction side The precision of prediction of method is not influenceed by given power frequency and amplitude change, and predicts that thought is also not limited to unipolarity single-revolution Phase controls, and equally has reference significance to other pulse width modulation control methods.
To achieve the above object, a kind of current ripples prediction side based on unipolarity one circle control provided by the invention Method, comprise the following steps：
1) according to given value of current value prediction feedback current first harmonics and the fundamental wave difference DELTA i of given electric currentpre, and obtain initial The given electric current i at momentrefWith feedback current ifedDifference be electric current initial value error delta i0, Δ i0=iref-ifed；
2) electric current initial value error delta i0, and combine the fundamental wave difference DELTA i that step 1) prediction obtainspreElectric current is compensated Calculate, be compensated value Δ icomp；
3) variable quantity that electric current rises or falls in each current tracking switch periods, i.e. current tracking switch periods are calculated Interior second stage current change quantity Δ i2, recycle step 2) and obtained offset Δ icompWith electric current initial value error delta i0, According to electric current initial value error delta i0Positive and negative, calculating current ripple peak-to-peak value；
4) step 1) is performed in each predetermined period to step 3), obtains the accurate reality of each periodic current ripple peak-to-peak value When predict, the current ripples peak-to-peak value in each cycle forms the envelope of current ripples waveform, so as to obtain the real-time of current ripples Prediction.
Further, fundamental wave difference DELTA i in step 1)preCalculating process it is as follows：
1.1) the given value of current value for recording the first two switch periods is i0, the given value of current value of previous switch periods is i1, The given value of current value of current switch period is i2；
1.2) using quadratic interpolation come prediction feedback current first harmonics and the difference DELTA i of given electric currentpre,
Further, in step 2), according to current ripples peak-to-peak value Δ ippAppear in the rank of current tracking in switch periods Section carries out non-constant compensation or electric current initial value error compensation to electric current.
Further, the detailed process of step 2) is as follows：Judge electric current initial value error delta i0It is positive and negative,
In Δ i0In the case of >=0, if current ripples peak-to-peak value Δ ippAppear in second of current tracking in switch periods Stage while having a great influence (i.e. by fundamental wave is non-constant), then the non-constant compensation of fundamental wave is carried out, is compensated value Δ icomp=2D Δs ipre, wherein, D is the dutycycle of each switch periods；If current ripples peak-to-peak value Δ ippAppear in the initial time of switch periods (i.e. by electric current initial value error delta i0Have a great influence), then electric current initial value error compensation is carried out, is compensated value Δ icomp=-2 Δs ipre；
Similarly obtain, in Δ i0In the case of ＜ 0, under the non-constant compensation of fundamental wave, offset is Δ icomp=-2D Δs ipre；Under electric current initial value error compensation, offset is still Δ icomp=-2 Δ ipre
Further, in step 3), calculated respectively under conditions of the non-constant compensation of fundamental wave and electric current initial value error compensation Current ripples peak-to-peak value Δ ipp, and it is current ripples peak to take the maximum in the non-constant compensation of fundamental wave and electric current initial value error compensation Peak delta ipp。
Further, the detailed process of step 3) is as follows：
3.1) according to unipolarity one circle control strategy, the dutycycle of current switch period is calculated Wherein, L is magnetic bearing coil inductance, and R is magnetic bearing coil resistance, UdcIt is the DC bus-bar voltage of power amplifier, TsIt is work( The switch periods of rate amplifier switching tube；
3.2) the variation delta i that electric current in each switch periods rises or falls is calculated2,
3.3) electric current initial value error delta i is judged0It is positive and negative,
As Δ i0When >=0, under the non-constant compensation of fundamental wave, current ripples peak-to-peak value Under electric current initial value error compensation, current ripples peak-to-peak value Δ ipp=| Δ i2+ΔicompThe Δ i of |=| 20-2Δ ipre|；Current ripples peak-to-peak value Δ ippBoth maximums are taken, i.e.,
As Δ i0During ＜ 0, under the non-constant compensation of fundamental wave, current ripples peak-to-peak value Under electric current initial value error compensation, current ripples peak-to-peak value Δ ipp=| Δ i2+ΔicompThe Δ i of |=| 20-2 Δipre|；Current ripples peak-to-peak value Δ ippBoth maximums are taken, i.e.,
The beneficial effects of the present invention are：
(1) curent change is considered when ripple peak-to-peak value is predicted, precision of prediction is higher.Exist if in hypothesis current first harmonics Ripple peak-to-peak value prediction is carried out in the case of keeping constant in one switch periods, then ripple caused by the hypothesis predicts error meeting Become big as the change of the amplitude and frequency of fundamental current is big, so as to which precision of prediction can also be deteriorated, and this patent is no longer defaulted as Be predicted under stable state, establish compensation model to non-constant in switch periods of fundamental current, thus can Accurate Prediction move Current ripples peak-to-peak value under state, and in the case where fundamental current amplitude and frequency change, it is accurate to remain able to prediction.
(2) consider that feedback current has certain phase delay relative to given electric current, it is anti-no longer to give tacit consent to given electric current Supply current fundamental wave, compensation model is established to the electric current initial value error between feedback current fundamental wave and feedback current, therefore can be accurate Really predict the current ripples peak-to-peak value of feedback current in itself.
(3) current ripples Forecasting Methodology proposed by the present invention, it compensate for traditional utilization voltage alternating component and produce electric current The deficiency of the Forecasting Methodology of ripple, current ripples peak-to-peak value can be accurately predicted, to the ripple under different current-modulation modes Prediction equally has reference significance, and especially precision of prediction advantage becomes apparent under low current ripple occasion.
Brief description of the drawings
Fig. 1 is permanent magnet biased magnetic bearing full-bridge type close power amplifier topological structure in embodiment；
1 main waveform of Fig. 2 unipolarity one circle control strategy works situation；
2 main waveform of Fig. 3 unipolarity one circle control strategy works situation；
The difference schematic diagram of Fig. 4 interpolation method prediction feedback current first harmonics and given electric current；
The non-constant compensation schematic diagram of fundamental wave is carried out under Fig. 5 unipolarity one circle controls；
Electric current initial value error compensation schematic diagram is carried out under Fig. 6 unipolarity one circle controls.
Embodiment
Technical scheme is described in detail with specific embodiment below in conjunction with the accompanying drawings.
For permanent magnetism off-set magnetic suspension bearing, it requires that the coil of perception can flow through Bipolar current, therefore more Power converter topologies structure is used as by the use of the full-bridge type close power amplifier shown in Fig. 1.The effect of magnetic bearing switch power amplifier is, according to The output signal of controller produces corresponding electric current in controling winding, so as to provide desired caused suspending power so that turn Sub- stable suspersion is in equilbrium position.
The control thought of close power amplifier one circle control is so that the average value of each switch periods internal feedback curent change Equal to given electric current.Under bipolarity one circle control, there is charging and discharging state in power amplifier simultaneously in a cycle, and in list Under polarity one circle control, power amplifier only exists charging, freewheeling state or electric discharge, freewheeling state, therefore, monopole in a cycle Property one circle control is smaller than bipolarity one circle control ripple, more has application value.
Unipolarity one circle control main operational principle is briefly introduced with reference to embodiment, in order to more meet work Cheng Yingyong, all by two bridge arm down tubes of full-bridge circuit, i.e. Q2 and Q4 in Fig. 1 carry out afterflow for the freewheeling state of close power amplifier. Define electric current initial value error delta i0=iref-ifed, wherein irefTo give electric current, ifedFor feedback current.
As shown in Fig. 2 TsIt is the switch periods of power amplifier switches pipe, D is switching tube Q1Dutycycle, the i in figureref For the given electric current of this switch periods, the i in figurefedIt is the feedback current tracking waveform in switch periods.As Δ i0>=0, Switching tube Q3Perseverance shut-off, Q4Open-minded, the Q of perseverance1With Q2Complementation conducting, waveform i is tracked by the feedback current in the case of Fig. 2fedIt can see Go out, now current ripples peak-to-peak value Δ ippRise variation delta i with the electric current of second stage in switch periods2It is relevant.
As shown in figure 3, D is switching tube Q in figure3Dutycycle, as Δ i0＜ 0, switching tube Q1Perseverance shut-off, Q2Open-minded, the Q of perseverance3 With Q4Complementation conducting, waveform i is tracked by the feedback current in the case of Fig. 3fedAs can be seen that now current ripples peak-to-peak value with electricity It is relevant to flow initial value error.
Now by taking the close power amplifier under unipolarity one circle control as an example, specific implementation step in embodiment is explained in detail State.
Step 1: the difference of prediction feedback current first harmonics and given electric current
Under unipolarity one circle control, feedback current fundamental wave and difference of the given current differential in a switch periods Value, equal to variable quantity of the given electric current in half period.As shown in figure 4, the given value of current value of record the first two switch periods For i0, the given value of current value of previous switch periods is i1, the given value of current value of current switch period is i2.Lower half period is given Determine current value ipreIt can be predicted by interpolation method.Predicted, obtained using quadratic interpolationSo as to Obtain the difference of feedback current fundamental wave and given electric current
Calculate initial time t0The given electric current i at momentrefWith feedback current ifedDifference, be electric current initial value error delta i0 =iref-ifed。
Step 2: establish the non-constant compensation model of fundamental wave and electric current initial value error compensation model.
In electric current initial value error delta i0Under opposed polarity, current tracking waveform is different.But current ripples peak-to-peak value only can At two, when the second stage in switch periods, as shown in figure 5, at this moment just needing to consider the non-constant compensation of fundamental wave；Two It is initial time and the finish time of switch periods, as shown in fig. 6, because current tracking is symmetrical, therefore only consider initial time, At this moment just need to consider electric current initial value error compensation.
Compensation non-constant to fundamental wave and electric current initial value error compensation are modeled below.
The non-constant compensation of fundamental wave：As shown in figure 5, given electric current iref, feedback current ifed, feedback current fundamental wave ifedFundamental wave, And the half Δ i of current ripples peak-to-peak valuepp/ 2 mark in figure.In the case of fig. 5, current ripples peak-to-peak value Δ ippThe second stage of current tracking in switch periods is appeared in, is had a great influence, it is necessary to which to carry out fundamental wave non-constant by fundamental wave is non-constant Compensation.In Δ i0In the case of >=0, offset is Δ icomp=2D Δs ipre, wherein D is the dutycycle of each switch periods, Δi0In the case of ＜ 0, offset is Δ icomp=-2D Δs ipre。
Electric current initial value error compensation：In figure 6, electric current i is givenref, feedback current ifed, feedback current fundamental wave ifedFundamental wave, And the half Δ i of current ripples peak-to-peak valuepp/ 2 mark in figure.Current ripples peak-to-peak value Δ ippIt is then feedback current base Electric current initial value error between ripple and feedback current.In the case shown in fig. 6, current ripples peak-to-peak value Δ ippAppear in switch The initial time in cycle, had a great influence by electric current initial value error, it is necessary to carry out electric current initial value error compensation.In Δ i0Both positive and negative Under opposed polarity, offset is all Δ icomp=2 Δ ipre, wherein D is the dutycycle of each switch periods.
Step 3: establish accurate current ripples forecast model
The control thought of unipolarity one circle control strategy is to realize control targe in a controlling cycle, i.e. feedback electricity Average value of the stream tracking in a switch periods is equal to given electric current, and power amplifier will not have charging simultaneously in a cycle With discharge condition.According to unipolarity one circle control strategy, the dutycycle of current switch period is calculated Wherein, L is magnetic bearing coil inductance, and R is magnetic bearing coil resistance, UdcIt is the DC bus-bar voltage of power amplifier, TsIt is work( The switch periods of rate amplifier switching tube.It is so as to calculate the variable quantity that electric current rises or falls in each switch periods
Judge electric current initial value error delta i0It is positive and negative, as Δ i0When >=0, under the non-constant compensation of fundamental wave, current ripples peak peak ValueUnder electric current initial value error compensation, current ripples peak-to-peak value Δ ipp =| Δ i2+ΔicompThe Δ i of |=| 20-2Δipre|.So as to as Δ i0When >=0, current ripples peak-to-peak value Δ ippTake both most Big value, i.e.,
As Δ i0During ＜ 0, under the non-constant compensation of fundamental wave, current ripples peak-to-peak value Under electric current initial value error compensation, current ripples peak-to-peak value Δ ipp=| Δ i2+ΔicompThe Δ of |=| 2 i0-2Δipre|.So as to as Δ i0During ＜ 0, current ripples peak-to-peak value Δ ippBoth maximums are taken, i.e.,
To sum up, the current ripples accurate prediction models based on unipolarity one circle control can be attributed to：As Δ i0When >=0, Current ripples peak-to-peak valueAs Δ i0During ＜ 0, current ripples peak Peak value
Step 1 is performed in each predetermined period to step 3, it is possible to achieve to the accurate real-time of current ripples peak-to-peak value Prediction.Current ripples peak-to-peak value is the envelope of current ripples waveform, so as to also just obtain the real-time estimate of current ripples.
In summary, the accurate Forecasting Methodology of a kind of current ripples based on unipolarity one circle control proposed by the present invention, It is main to consider the non-constant compensation of fundamental wave and current error initial value compensation, so as to accurately predict current ripples peak-to-peak value. Current ripples peak-to-peak value is the envelope of current ripples waveform, in the case where accurately predicting current ripples peak-to-peak value, The real-time accurate prediction of current ripples is just obtained.Compensation thought proposed by the present invention, to the electricity under different current-modulation modes Accurately prediction equally has reference significance to flow liner ripple.Therefore, the invention enables ripple prediction realization it is more accurate, this be based on The control strategy of the power inverter of ripple prediction lays a solid foundation.
Although embodiment of the present invention is described above in association with accompanying drawing, the invention is not limited in above-mentioned Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted 's.One of ordinary skill in the art is under the enlightenment of this specification, in the scope for not departing from the claims in the present invention and being protected In the case of, the form of many kinds can also be made, these belong to the row of protection of the invention.

Claims (6)

1. the accurate Forecasting Methodology of a kind of current ripples based on unipolarity one circle control, it is characterised in that comprise the following steps：
1) according to given value of current value prediction feedback current first harmonics and the fundamental wave difference DELTA i of given electric currentpre, and obtain initial time Given electric current irefWith feedback current ifedDifference be electric current initial value error delta i0, Δ i0=iref-ifed；
2) according to electric current initial value error delta i0, and combine the fundamental wave difference DELTA i that step 1) prediction obtainspreMeter is compensated to electric current Calculate, be compensated value Δ icomp；
3) variable quantity that electric current rises or falls in each current tracking switch periods is calculated, i.e., in current tracking switch periods Second stage current change quantity Δ i2, recycle step 2) and obtained offset Δ icompWith electric current initial value error delta i0, according to Electric current initial value error delta i0It is positive and negative, respectively calculating current ripple peak-to-peak value；
4) step 1) is performed in each predetermined period to step 3), obtains the real-time estimate of each periodic current ripple peak-to-peak value, The current ripples peak-to-peak value in each cycle forms the envelope of current ripples waveform, so as to obtain the real-time estimate of current ripples.
2. the accurate Forecasting Methodology of current ripples according to claim 1, it is characterised in that fundamental wave difference in the step 1) ΔipreCalculating process it is as follows：
1.1) the given value of current value for recording the first two switch periods is i0, the given value of current value of previous switch periods is i1, currently The given value of current value of switch periods is i2；
1.2) using quadratic interpolation come prediction feedback current first harmonics and the difference DELTA i of given electric currentpre,
3. the accurate Forecasting Methodology of current ripples according to claim 1 or 2, it is characterised in that in the step 2), according to Current ripples peak-to-peak value Δ ippThe stage of current tracking carries out non-constant compensation or electric current to electric current in appeared in switch periods Initial value error compensation.
4. the accurate Forecasting Methodology of current ripples according to claim 3, it is characterised in that the step 2) includes following step Suddenly,
Judge electric current initial value error delta i0It is positive and negative：
In Δ i0In the case of >=0, if current ripples peak-to-peak value Δ ippThe second stage of current tracking in switch periods is appeared in, The non-constant compensation of fundamental wave is then carried out, is compensated value Δ icomp=2D Δs ipre, wherein, D is the dutycycle of each switch periods； If current ripples peak-to-peak value Δ ippThe initial time of switch periods is appeared in, then carries out electric current initial value error compensation, is compensated It is worth Δ icomp=-2 Δ ipre；
In Δ i0In the case of ＜ 0, if current ripples peak-to-peak value Δ ippThe second stage of current tracking in switch periods is appeared in, The non-constant compensation of fundamental wave is then carried out, it is Δ i to be compensated valuecomp=-2D Δs ipre；If current ripples peak-to-peak value Δ ippAppear in The initial time of switch periods, then electric current initial value error compensation is carried out, it is Δ i to be compensated valuecomp=-2 Δ ipre。
5. the accurate Forecasting Methodology of current ripples according to claim 1 or 2, it is characterised in that in the step 3), in base Distinguish calculating current ripple peak-to-peak value Δ i under conditions of the non-constant compensation of ripple and electric current initial value error compensationpp, and take fundamental wave impermanent Maximum in fixed compensation and electric current initial value error compensation is current ripples peak-to-peak value Δ ipp。
6. the accurate Forecasting Methodology of current ripples according to claim 5, it is characterised in that the step 3)
Comprise the following steps：
3.1) according to unipolarity one circle control strategy, the dutycycle of current switch period is calculatedIts In, L is magnetic bearing coil inductance, and R is magnetic bearing coil resistance, UdcIt is the DC bus-bar voltage of power amplifier, TsIt is power The switch periods of amplifier switch pipe；
3.2) the variation delta i that electric current in each switch periods rises or falls is calculated2,
3.3) judge electric current initial value error delta i0It is positive and negative,
As Δ i0When >=0, under the non-constant compensation of fundamental wave, current ripples peak-to-peak value Under electric current initial value error compensation, current ripples peak-to-peak value Δ ipp=| Δ i2+ΔicompThe Δ of |=| 2 i0-2Δipre|；Current ripples peak-to-peak value
As Δ i0During ＜ 0, under the non-constant compensation of fundamental wave, current ripples peak-to-peak value Under electric current initial value error compensation, current ripples peak-to-peak value Δ ipp=| Δ i2+ΔicompThe Δ of |=| 2 i0-2Δipre|；Current ripples peak-to-peak value
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