CN102095918B - AC motor drive current measuring system and method - Google Patents
AC motor drive current measuring system and method Download PDFInfo
- Publication number
- CN102095918B CN102095918B CN201010575697.7A CN201010575697A CN102095918B CN 102095918 B CN102095918 B CN 102095918B CN 201010575697 A CN201010575697 A CN 201010575697A CN 102095918 B CN102095918 B CN 102095918B
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- China
- Prior art keywords
- motor
- link
- phase inverter
- shunt
- current
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- Expired - Fee Related
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- 238000000034 method Methods 0.000 title description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 11
- 230000010354 integration Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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
-
- 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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
A kind of AC motor drive current measuring system (9), native system uses together with transmit the phase inverter (1) of drive current to AC motor (2), is used for measuring the electric current supplied to motor (2).Phase inverter (1) is connected with power supply (3) by DC link (5), and native system comprises the device (10) measured to the electric current I dc of phase inverter (1) in DC link (5).It also comprises the device (10) of the transmitter currents Ie determined in a motor power transmission line and determines the processor (9) of AC component of transmitter currents.Processor is used for the AC component of the determination of Idc and transmitter currents to combine, to determine the value about current of electric size.
Description
Technical field
The present invention relates to a kind of AC motor drive current measuring system and method, relate to a kind of Induction Motor Drive device particularly.
Background technology
Induction Motor Drive device phase inverter provides one group of driving voltage with variable frequency and amplitude.Wish that phase inverter has the ability of the electric current accurately detected in the circuit of motor.In some equipment, this realizes by directly measuring, but it needs the high_voltage isolation between motor and control system, and this is called, and direct current is negative to be connected or safety ground.
Also wish, when applying short circuit to inverter output, phase inverter can cut out before resisting damage by its internal part.EP 1092981 and GB 2426393 discloses motor controller apparatus, wherein, by determining current of electric to DC link current or inverter bridge sending and receiving emitter current sampling.When EP 1092981, need special insulated gate bipolar transistor (IGBT) power model, further, when using GB 2426393 of standard I GBT power model, three completely independently integrated analog digit converters (ADC) are needed.
Therefore, prior art needs special power model or three independently integration ADC, and this makes arbitrary solution all costly.The present invention attempts to reduce these problems, and reduces the cost of controller, but also provides the fast response time to short-circuit conditions.
Summary of the invention
According to the present invention, provide a kind of AC motor drive current measuring system, it uses together with transmit the phase inverter of drive current to AC motor, in use, phase inverter is connected with system power supply (mains supply) by DC link, and native system comprises the device measured to the electric current I dc of phase inverter in DC link; Determine the device of the transmitter currents in a motor power transmission line; Determine the device of the AC component of transmitter currents waveform; And the AC component of the determination of the electric current in DC link and transmitter currents is combined the device of the value determined about current of electric size.
Accompanying drawing explanation
By means of only example, the specific embodiment of the present invention will be described now, wherein:
Fig. 1,2 and Fig. 5 show the first and second embodiments of the present invention;
Fig. 3 to Fig. 4 shows the schematic diagram of method.
Embodiment
As shown in Figure 1, phase inverter 1 pair of AC motor 2 with on-off element (not shown) provides three outputs.As known in the art, these export the AC signal providing out of phase relation, rotate to make motor.Power supply 3 is connected with+DC link 4 and lower minus strand road DC 5.First shunt 6 is set between+DC link and phase inverter 1.Second shunt 7 is set, to be connected with phase inverter 1 by negative DC link.Between the output half-bridge (half bridges) comprising phase inverter 1 shunt 7 and, the 3rd shunt 8 is set.
Current measurement system 9 is connected across on the second shunt 7 and the 3rd shunt 8, to measure electric current I dc (DC link current) and Ie (transmitter currents of a phase place) respectively.This illustrates in greater detail in fig. 2.Current measurement system 9 based on microprocessor, and is programmed to operate in the following manner.It comprises two integrated ADC 10 and 16 with δ (delta) σ (sigma) structure.
Current measurement system 9 provides two functions; The protection of the power semiconductor in phase inverter and the current monitoring to Electric Machine Control.Perform this two functions simultaneously, but will be described respectively.Power semiconductor defencive function is as shown in the series of steps in Fig. 3.In first step 20, monitor the electric current I dc on shunt 7 with a δ σ modulator 10.Protecting to obtain gratifying IGBT, must 10 μ s internal cutting off output short circuit currents be less than.By filtering the δ σ modulator output stream 11 of modulator 10 with short time constant filtrator 13, and with comparer 15a, the simulation of filtrator 13 or multidigit filter value 14 are compared with threshold value 15, the fault current of any quick increase on detected Idc can be detected.If exceed threshold value, overcurrent release (overcurrenttrip) is used to cut off whole drive unit so immediately.
From power=Idc × Vdc, obtain DC link current and poower flow, wherein, Vdc is DC link voltage.On control cycle, integration is carried out to δ σ modulator output stream 11 by integrator 12, to obtain the really integrated average DC link current value Idc exported from integrator 12.In step 21, the processor 9a of current measurement system is from calculating
determine the real part of current of electric, wherein, M is the depth of modulation of output voltage waveforms.The convergent-divergent (scaling) of attention: M; In this document, be scaled to by M and make, before making waveform distortion by carrying out amplitude limit (clip) to DC link, the value of 1.0 is maximum percentage modulations of space vector modulation.
Fig. 4 shows the current monitoring operation of current measurement system.In first step 30, measure the voltage on the shunt 8 in a transmitter leg with second integral ADC 16, and determine Ie thus.This measurement continues in a motor cycle, and, in step 31, determined alternating current (AC) part of transmitter currents waveform by the instantaneous Idc deducting 1/3 from instantaneous Ie.In the step 32, the mean value in motor cycle of the AC component of Ie is determined.In step 33, by by the average A C component of the Ie for motor cycle and immobilisation factor
be multiplied the approximate value of the size determining current of electric vector, to obtain root-mean-square value.If (before convergent-divergent (rescaling) again, deduct 0.05 × [Idc] from AC component, so precision can improve, and wherein, [Idc] is the absolute value of Idc.)
Fig. 5 shows an alternate embodiments of the present invention, and wherein, similar parts indicate the reference number identical with the first embodiment.In this embodiment, the difference of the layout of shunt is, is provided for the shunt 40 of the measurement at each transmitter leg place, but not the single shunt 7 of the first embodiment.To see in negative dc link circuit, there is no shunt (different from first embodiment with shunt 7).By reference to single leg, such as, by the measurement on shunt 40c, Ie is determined as previously mentioned.But, in order to measure Idc, as shown, provide three substitutional resistance devices 41 to 43 of connection.Resistor 41 is connected to the input end 44 of current measurement system 9 from the motor side of shunt 40c.Resistor 42 is connected to input end 44 from the motor side of shunt 40b, and resistor 43 is connected to input end 44 from the motor side of shunt 40a.Current measurement system 9 is also connected to negative dc link by input end 45, and is connected to the motor side of shunt 40c by input end 46.The value about Idc determined in this method is 1/3 of the value method of use first embodiment detected.
In two embodiments, all use integration ADC.These are configured to, integrated on the cycle in an integer pulse-length modulation (PWM).This has the advantage cancelling the noise relevant with switching frequency.
Claims (6)
1. an AC motor drive current measuring system, described system uses together with transmit the phase inverter of drive current to AC motor, described phase inverter is connected with power supply by DC link, and described system comprises the device measured to the electric current I dc of described phase inverter in described DC link; Determine the device of the transmitter currents Ie in a described phase inverter output; Determine the device of the AC component of described transmitter currents and the AC component of the determination of Idc and described transmitter currents combined the device of the value determined about current of electric size.
2. system according to claim 1, wherein, described transmitter currents Ie is determined by the voltage measured on the shunt in motor power transmission line.
3. system according to claim 1, wherein, the voltage that described system detects from the shunt between described DC link and described phase inverter obtains described electric current I dc.
4. system according to claim 1, wherein, described system comprises the shunt that is connected on motor circuit further and is connected to first of described DC link to be measured input end and second and measures resistor between input end, to determine the value about Idc from the voltage sensed on input end.
5. system according to claim 1, wherein, corresponding shunt is included to every bar transmitter line that described motor connects, and, between the motor side and the first measurement input end being connected to described DC link of described shunt, connect corresponding resistor.
6. according to system in any one of the preceding claims wherein, wherein, described electric current uses integrated analog to digital converter to obtain.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009057282.1 | 2009-12-07 | ||
| DE200910057282 DE102009057282B4 (en) | 2009-12-07 | 2009-12-07 | Current Measurement System |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102095918A CN102095918A (en) | 2011-06-15 |
| CN102095918B true CN102095918B (en) | 2015-09-30 |
Family
ID=43972377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010575697.7A Expired - Fee Related CN102095918B (en) | 2009-12-07 | 2010-12-06 | AC motor drive current measuring system and method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102095918B (en) |
| DE (1) | DE102009057282B4 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010042946A1 (en) * | 2010-10-26 | 2012-04-26 | Lenze Se | frequency converter |
| CN102998648B (en) * | 2012-12-13 | 2015-07-08 | 湖南省电力公司科学研究院 | Multifunctional electric meter for alternating and direct currents |
| EP3078107B1 (en) | 2013-12-04 | 2019-11-20 | Schneider Electric IT Corporation | Improvement of inverter regulation |
| EP2963426B1 (en) * | 2014-06-30 | 2018-05-30 | Microelettrica Scientifica S.p.A. | Measuring arrangement for measuring direct and alternating current |
| EP3160033B1 (en) * | 2015-10-20 | 2022-12-14 | Schneider Electric IT Corporation | Current sensing system for full-bridge pulse-width modulated inverter system |
| DE102016217874A1 (en) | 2016-09-19 | 2018-03-22 | Bayerische Motoren Werke Aktiengesellschaft | Method for current measurement on an inverter, current measuring device and inverter unit therewith |
| DE102020111901B3 (en) * | 2020-05-03 | 2021-04-22 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Method and device for determining the intermediate circuit current of a converter |
| CN113049868A (en) * | 2021-03-10 | 2021-06-29 | 优利德科技(中国)股份有限公司 | Alternating current and direct current measuring device and measuring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1092981A2 (en) * | 1999-10-15 | 2001-04-18 | Siemens Aktiengesellschaft | Apparatus and method for measuring current |
| EP1280264A3 (en) * | 2001-07-27 | 2003-08-06 | Hitachi, Ltd. | AC current detecting device for inverter apparatus and AC current detecting method therefor |
| GB2426393A (en) * | 2005-05-20 | 2006-11-22 | Siemens Ag | An AC motor drive current measurement system |
-
2009
- 2009-12-07 DE DE200910057282 patent/DE102009057282B4/en not_active Expired - Fee Related
-
2010
- 2010-12-06 CN CN201010575697.7A patent/CN102095918B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1092981A2 (en) * | 1999-10-15 | 2001-04-18 | Siemens Aktiengesellschaft | Apparatus and method for measuring current |
| EP1280264A3 (en) * | 2001-07-27 | 2003-08-06 | Hitachi, Ltd. | AC current detecting device for inverter apparatus and AC current detecting method therefor |
| GB2426393A (en) * | 2005-05-20 | 2006-11-22 | Siemens Ag | An AC motor drive current measurement system |
Non-Patent Citations (2)
| Title |
|---|
| 三相无刷直流驱动电机的电流测量;马晓猛;《航空维修与工程》;19950430(第4期);全文 * |
| 林家春等.高精度永磁同步直线伺服***中的电流测量.《清华大学学报(自然科学版)》.2006,第46卷(第11期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102095918A (en) | 2011-06-15 |
| DE102009057282B4 (en) | 2013-05-29 |
| DE102009057282A1 (en) | 2011-06-09 |
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Granted publication date: 20150930 |