CN110441589A - A kind of sampling of inverter current in line justification and bearing calibration - Google Patents

A kind of sampling of inverter current in line justification and bearing calibration Download PDF

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Publication number
CN110441589A
CN110441589A CN201910682117.5A CN201910682117A CN110441589A CN 110441589 A CN110441589 A CN 110441589A CN 201910682117 A CN201910682117 A CN 201910682117A CN 110441589 A CN110441589 A CN 110441589A
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current
phase
sample
follows
voltage
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CN110441589B (en
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张海波
王东宝
黄维纲
王自通
徐佩佩
郁小昊
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Canny Elevator Co Ltd
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Canny Elevator Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • 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
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
    • 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
    • H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
    • H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference

Abstract

The invention discloses a kind of samplings of inverter current in line justification and bearing calibration, comprising the following steps: step A: applying voltage in turn respectively to motor U, V, W three-phase and obtains the current sampling data of corresponding voltage；Step B: the AD error of different current sample phases is calculated；Step C: the AD linearity correction amount of different current sample phases is calculated；Step D: the value after calculating AD correction.The present invention uses three kinds of cyclical voltage applying modes, according to obtained current sampling data, can short circuit to three-phase current sampling circuit and open circuit judge, bearing calibration through the invention is to three-phase current sampled value, the precision of current sample is improved, thus electromagnetic noise and harmonic component when achieving the effect that reduce motor operation.

Description

A kind of sampling of inverter current in line justification and bearing calibration
Technical field
The invention belongs to converter technology fields, and in particular to a kind of sampling of inverter current in line justification and correction side Method.
Background technique
Due to the sampling of frequency converter three-phase current and conversion hardware circuit are inconsistent, so that the electric current that software obtains is adopted Sample digital quantity and actual current value have certain deviation, and with fluctuation up and down.The deviation and fluctuation of current sample, can lead The aggravation of electromagnetic noise and harmonic component, can also cause torque pulsation when cause motor operation when serious, so that motor performance reduces.
Summary of the invention
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide a kind of inverter currents to adopt Sample in line justification and bearing calibration.
To realize the above-mentioned technical purpose, the technical scheme adopted by the invention is as follows: a kind of sampling of inverter current it is online really Recognize and bearing calibration, the described method comprises the following steps:
Step A: apply voltage in turn respectively to motor U, V, W three-phase and obtain the current sampling data of corresponding voltage；
Step B: the AD error of different current sample phases is calculated；
Step C: according to the AD error of different current sample casees, the AD linearity correction amount of different current sample phases is calculated；
Step D: the value after calculating AD correction.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
Above-mentioned step A is specific as follows:
A1: apply voltage { U respectively to motor U, V, W, three-phasea、Ub、Ux, corresponding current sampled value is calculated
{AD_ia[0]、AD_ib[0]、AD_ix[0]}
A2: apply voltage { U respectively to motor V, W, U three-phasea、Ub、Ux, corresponding current sampled value is calculated:
A3: apply voltage { U respectively to motor W, U, V three-phasea、Ub、Ux, corresponding current sampled value is calculated:
Wherein: { AD_ia[n] } indicate voltage UaUnder current sampling data, { AD_ib[n] } indicate voltage UbUnder electric current adopt Sample value, { n=0,1,2 }, Zu、Zv、ZwIt is U, V, W input impedances, C respectivelyu、Cv、CwU, V, W three-phase electricity flow valuve respectively with The proportionality coefficient of its AD sampled value.
Above-mentioned step B is specific as follows:
B1: the average value of different electric current AD samplings is calculated:
B2: the AD error of different current sample phases is calculated:
For the channel U phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively
(AD_ia-AD_ia[0])、(AD_ib-AD_ib[2])。
For the channel V phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively
(AD_ia-AD_ia[1])、(AD_ib-AD_ib[0])。
For the channel W phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively
(AD_ia-AD_ia[2])、(AD_ib-AD_ib[1])。
Above-mentioned step C is specific as follows:
For the channel U phase AD of current sample, sample to obtain digital quantity AD_U in AD0When, correcting value calculates as follows:
For the channel V phase AD of current sample, sample to obtain digital quantity AD_V in AD0When, correcting value calculates as follows:
For the channel W phase AD of current sample, sample to obtain digital quantity AD_W in AD0When, correcting value calculates as follows:
Above-mentioned step D is specific as follows:
For the channel U phase AD of current sample, sample to obtain digital quantity AD_U in AD0When, the value after correcting value calculates It is as follows:
AD_U=AD_U0+AD_ΔU (8)
For the channel V phase AD of current sample, sample to obtain digital quantity AD_V in AD0When, the value after correcting value calculates It is as follows:
AD_V=AD_V0+ AD_ Δ V (9) samples to obtain digital quantity AD_ in AD for the channel W phase AD of current sample W0When, the value after correcting value calculates as follows:
AD_W=AD_W0+AD_ΔW (10)
Above-mentioned motor is asynchronous machine or permanent magnet synchronous motor.
Beneficial effects of the present invention:
1, the present invention uses three kinds of cyclical voltage applying modes, according to obtained AD_ia[0]、AD_ib[0]、AD_ia[1]、 AD_ib[1]、AD_ia[2]、AD_ib[2] current sampling data, can short circuit to three-phase current sampling circuit and open circuit sentence It is disconnected.
2, bearing calibration through the invention improves the precision of current sample to three-phase current sampled value, to reach The effect of electromagnetic noise and harmonic component when reducing motor operation.
Detailed description of the invention
Scheme the flow diagram first is that of the invention；
Scheme the system block diagram second is that current sampling circuit；
Figure is third is that the schematic illustration that current sample AD is corrected；
Figure is not fourth is that use the current sampling data schematic diagram of current sample bearing calibration according to the present invention；
Figure is fifth is that use the current sampling data schematic diagram of current sample bearing calibration according to the present invention；
Figure is not sixth is that use the electromagnetic noise schematic diagram of current sample bearing calibration according to the present invention；
Figure is seventh is that use the electromagnetic noise schematic diagram of current sample bearing calibration according to the present invention；
Figure is not eighth is that use the current waveform schematic diagram of current sample bearing calibration according to the present invention；
Figure is ninth is that use the current waveform schematic diagram of current sample bearing calibration according to the present invention.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, the present invention is a kind of sampling of inverter current in line justification and bearing calibration, including following step It is rapid:
Step A: apply voltage in turn respectively to motor U, V, W three-phase and obtain the current sampling data of corresponding voltage；
A1: apply voltage { U respectively to motor U, V, W, three-phasea、Ub、Ux, corresponding current sampled value { AD_i is calculateda [0]、AD_ib[0]、AD_ix[0]}
A2: apply voltage { U respectively to motor V, W, U three-phasea、Ub、Ux, corresponding current sampled value is calculated:
A3: apply voltage { U respectively to motor W, U, V three-phasea、Ub、Ux, corresponding current sampled value is calculated:
Wherein: AD_ia[n] indicates voltage UaUnder current sampling data, AD_ib[n] indicates voltage UbUnder current sample Value, { n=0,1,2 }, Zu、Zv、ZwIt is U, V, W input impedances, C respectivelyu、Cv、CwIt is U, V, W three-phase electricity flow valuve and its respectively The proportionality coefficient of AD sampled value.
According to application according to application voltage { Ua、Ub、UxAnd AD sampling linearity correction needs, only take { Ua、UbCorresponding The electric current AD_i of generationa[n]、AD_ib[n], UxThe corresponding electric current AD_i generatedx[n] is not dealt with.
Step B: the AD error of different current sample phases is calculated；
B1: the average value of different electric current AD samplings is calculated:
B2: the AD error of different current sample phases is calculated:
For the channel U phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively (AD_ia-AD_ia [0])、(AD_ib-AD_ib[2])。
For the channel V phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively (AD_ia-AD_ia [1])、(AD_ib-AD_ib[0])。
For the channel W phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively (AD_ia-AD_ia [2])、(AD_ib-AD_ib[1])。
Step C: according to the AD error of different current sample casees, the AD linearity correction amount of different current sample phases is calculated；It is right In the channel U phase AD of current sample, sample to obtain digital quantity AD_U in AD0When, correcting value calculates as follows:
For the channel V phase AD of current sample, sample to obtain digital quantity AD_V in AD0When, correcting value calculates as follows:
For the channel W phase AD of current sample, sample to obtain digital quantity AD_W in AD0When, correcting value calculates as follows:
Wherein: (AD_ib-AD_ib[2])、(AD_ib-AD_ib[0])、(AD_ib-AD_ibIt [1]) is respectively zero shift rectifying Value,
Point It Biao Shi not linearity correction value.
Step D: the value after calculating AD correction；
For the channel U phase AD of current sample, sample to obtain digital quantity AD_U in AD0When, the value after correcting value calculates It is as follows:
AD_U=AD_U0+AD_ΔU (8)
For the channel V phase AD of current sample, sample to obtain digital quantity AD_V in AD0When, the value after correcting value calculates It is as follows:
AD_V=AD_V0+ AD_ Δ V (9) samples to obtain digital quantity AD_ in AD for the channel W phase AD of current sample W0When, the value after correcting value calculates as follows:
AD_W=AD_W0+AD_ΔW (10)
It is as shown in Figure 2 the system block diagram of current sampling circuit.In the electricity of six road the PWM output circuits and the right on the left side Between machine U, V, W three-phase, resistance R is sealed in respectivelyu、Rv、Rw, conducting and the pass of six road IGBT switching tubes are controlled by PWM algorithm It is disconnected, the inverter circuit of control motor is constituted, realizes the output of different voltages；The current sense being correspondingly connected with by each resistance Device detects its corresponding current value, is exported in the form of voltage magnitude；Then, voltage needed for being adjusted by current modulating circuit Amplitude and range；Finally, reading the current value indicated with voltage by the A D interface of DSP with software mode.
It is as shown in Figure 3 the schematic illustration of current sample AD correction, AD_U0It is current sampling data, in addition the AD of U phase Corrected value, the numerical value after finally obtaining correction, adjusts drift and the linearity by correction number.
Such as figure four and figure five show the current sampling data schematic diagram whether respectively obtained using the bearing calibration, You Tuke Know, bearing calibration through the invention further increases the precision of current sample.
Such as figure six and figure seven show the electromagnetic noise schematic diagram and figure eight whether respectively obtained using the bearing calibration It is shown the current waveform schematic diagram whether respectively obtained using the bearing calibration with figure nine, above-mentioned four width figure is disclosed by three Electromagnetic noise and harmonic component after phase current sampling value carries out the bearing calibration, when reducing motor operation.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention Range.

Claims (6)

1. a kind of sampling of inverter current in line justification and bearing calibration, it is characterised in that: the described method comprises the following steps:
Step A: apply voltage in turn respectively to motor U, V, W three-phase and obtain the current sampling data of corresponding voltage；
Step B: the AD error of different current sample phases is calculated；
Step C: the AD linearity correction amount of different current sample phases is calculated；
Step D: the value after calculating AD correction.
2. a kind of inverter current sampling according to claim 1 in line justification and bearing calibration, it is characterised in that: institute It is specific as follows to state step A:
A1: apply voltage { U respectively to motor U, V, W, three-phasea、Ub、Ux, corresponding current sampled value is calculated
{AD_ia[0]、AD_ib[0]、AD_ix[0]}
A2: apply voltage { U respectively to motor V, W, U three-phasea、Ub、Ux, corresponding current sampled value is calculated:
A3: apply voltage { U respectively to motor W, U, V three-phasea、Ub、Ux, corresponding current sampled value is calculated:
Wherein: { AD_ia[n] } indicate voltage UaUnder current sampling data, { AD_ib[n] } indicate voltage UbUnder current sampling data, { n=0,1,2 }, Zu、Zv、ZwIt is U, V, W input impedances, C respectivelyu、Cv、CwIt is U, V, W three-phase electricity flow valuve and its AD respectively The proportionality coefficient of sampled value.
3. a kind of inverter current sampling according to claim 2 in line justification and bearing calibration, it is characterised in that: institute It is specific as follows to state step B:
B1: the average value of different electric current AD samplings is calculated:
B2: the AD error of different current sample phases is calculated:
For the channel U phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively (AD_ia-AD_ia[0])、 (AD_ib-AD_ib[2])。
For the channel V phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively (AD_ia-AD_ia[1])、 (AD_ib-AD_ib[0])。
For the channel W phase AD of current sample, in voltage Ua、UbUnder effect, sampling deviation is respectively (AD_ia-AD_ia[2])、 (AD_ib-AD_ib[1])。
4. a kind of inverter current sampling according to claim 3 in line justification and bearing calibration, it is characterised in that: institute It is specific as follows to state step C:
For the channel U phase AD of current sample, sample to obtain digital quantity AD_U in AD0When, correcting value calculates as follows:
For the channel V phase AD of current sample, sample to obtain digital quantity AD_V in AD0When, correcting value calculates as follows:
For the channel W phase AD of current sample, sample to obtain digital quantity AD_W in AD0When, correcting value calculates as follows:
5. a kind of inverter current sampling according to claim 4 in line justification and bearing calibration, it is characterised in that: institute It is specific as follows to state step D:
For the channel U phase AD of current sample, sample to obtain digital quantity AD_U in AD0When, the value after correcting value calculates as follows:
AD_U=AD_U0+AD_ΔU (8)
For the channel V phase AD of current sample, sample to obtain digital quantity AD_V in AD0When, the value after correcting value calculates as follows:
AD_V=AD_V0+AD_ΔV (9)
For the channel W phase AD of current sample, sample to obtain digital quantity AD_W in AD0When, the value after correcting value calculates as follows:
AD_W=AD_W0+AD_ΔW (10)。
6. a kind of inverter current sampling according to claim 1 in line justification and bearing calibration, it is characterised in that: institute Stating motor is asynchronous machine or permanent magnet synchronous motor.
CN201910682117.5A 2019-07-26 2019-07-26 Online confirming and correcting method for current sampling of frequency converter Active CN110441589B (en)

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