CN104270002B - Passive suppression method for conducted electromagnetic interface of PWM (power width modulation) power converter - Google Patents

Passive suppression method for conducted electromagnetic interface of PWM (power width modulation) power converter Download PDF

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CN104270002B
CN104270002B CN201410578298.4A CN201410578298A CN104270002B CN 104270002 B CN104270002 B CN 104270002B CN 201410578298 A CN201410578298 A CN 201410578298A CN 104270002 B CN104270002 B CN 104270002B
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common mode
inductance
resistance
inverter
electric capacity
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CN104270002A (en
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肖芳
戈宝军
陶大军
王雪健
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention discloses a passive suppression method for the conducted electromagnetic interface of a PWM (power width modulation) power converter, belongs to the field of motor drive control and electromagnetic compatibility of integrated motor systems, and aims to solve the problems of low reliability, increase of a failure rate and incapability of reaching an electromagnetic compatibility standard of the conventional motor driving system under the influence of electromagnetic interface. An alternating current power supply, a rectifier, two direct current bus capacitors, an inverter, a long cable, a motor, a first filter and a second filter are involved, wherein the alternating current power supply is connected with the rectifier; the output end of the rectifier is connected with the two direct current bus capacitors; the other ends of the direct current bus capacitors are connected with the inverter; the output of the inverter is connected to the motor through the long cable; the input end of the first filter is connected to the inverter, a part of the output end of the first filter is connected to the motor, and another terminal is led from the output end of the first filter to be connected to a direct current bus clamping neutral point; the input end of the second filter is connected to the rectifier, a part of the output end of the second filter is connected to a power grid, and another terminal is led from the output end of the second filter to be connected to a neutral point of the motor. The method is applied to a PWM motor driving device.

Description

The passive suppressing method of pwm power inverter Conducted Electromagnetic Interference
Technical field
The invention belongs to the drive and control of electric machine of integrated motor system and field of electromagnetic compatibility.
Background technology
Power electronic equipment is more and more widely used although it improves in energy-conservation, improvement in industry and people's life The aspect such as industrial automatization and human habitat has shown larger advantage, but, due to power electronic equipment according to It is operated by electromagnetic energy, some useful or useless electromagnetic energies emit when they run, form electromagnetic interference, The normal work of other equipment in impact system.Thus, with the development of Power Electronic Technique, electromagnetic compatibility problem is also day Benefit highlights.
By the description to electromagnetic compatibility definition for the gjb72 1985 " electromagnetic interference and Electro Magnetic Compatibility term ", electromagnetic compatibility Property includes two aspects, on the one hand, the equipment in same electromagnetic environment or system energy normal work, on the other hand, equipment or The electromagnetic interference of system its own transmission will not constitute the electromagnetic interference that in this environment, other equipment can not be born.It is in same ring Each equipment (system, subsystem) in border can execute respective function normal work, keeps coexisting state.Here electromagnetic environment Level is to be collectively forming by artificial and natural disturbance source electromagnetic energy, is in the experimental situation and time of regulation, not In the case of Device under test energising, the value of the radiation of presence and Conduction Interference in surrounding space and electrical network.From electromagnetic compatibility Definition can be seen that electromagnetic compatibility include of both content, on the one hand need to meet electromagnetic susceptibility and require, i.e. equipment (system, subsystem) normally can be run under the electromagnetic environment of regulation；On the other hand need to meet Electromagnetic Launching requirement, that is, set The electromagnetic interference that standby (system, subsystem) produces itself does not interfere with the normal operation of other equipment yet.
The definition of electromagnetic disturbance and electromagnetic interference is distinguishing, and the former is a kind of electromagnet phenomenon, and this electromagnet phenomenon can Can reduce the performance of unit and system, or life or abiotic material may have been damaged；The latter refers to Have impact on the normal work of unit or system, cause the electromagnet phenomenon of its hydraulic performance decline；In other words, electromagnetic interference It is the consequence that electromagnetic disturbance causes, electromagnetic interference is also electromagnetic disturbance.Electromagnetic interference has very big harmfulness, can affect to set Standby, device and the normal operation of system, shorten its service life；The normal transmission of impact signal, is that the information of transmission shows The problems such as mistake, distortion and leakage；Can also result in misoperation or the improper phenomenon such as do not work during equipment operation； Human body itself also can be affected by electromagnetic radiation, upsets the normal life of people.
From 20 beginnings of the century, various countries begin to formulate and improve electromagnetic compatibility standard, have up to the present defined One complete standards system, electromagnetic compatibility standard can be generally divided into basic standard, the universal standard and product class standard etc..State Border radio special committee standard, International Electrotechnical Commission's series standard, the one-tenth in succession of the tissue such as en series standard of European Union Vertical, exactly because also international community pays much attention to electromagnetic compatibility problem.And at home, also begin to successively from the eighties in 20th century Formulate corresponding electromagnetic compatibility standard.It is military project department first in nineteen eighty-two reference American army mark mil-std-461b and mil- Std-462b starts to formulate my army's standard, and has promulgated army's universal standard gjb151 1986 and gjb152 in 1986 1986 subsequent national quality technical supervision general bureaus set up national radio interference standard technical committee in 1985, and reference Cispr and iec standard has formulated corresponding professional standard and national standard successively.The electromagnetic compatibility standard of China is most of at present Draw close with international standard phase, e.g., China have references to most cispr standard, is brought into national standard.And 1997 Year formulated new military standard gjb151a 1997 and gjb152a 1997 then have references to American army mark mil-std-461d and mil-std-462d.The promulgation of these standards and formulation, for improving the electromagnetic compatibility level of China, improving electromagnetic environment and create Condition, also promotes the research and development of China's electromagnetic compatibility.
Developing rapidly with Power Electronic Technique, the power inverter employing pulsewidth modulation strategy (pwm) extensively should For motor driven systems, larger performance indications that improve electric system.But power inverter is being controlled to electric energy While system and conversion, its high speed turns on and off the switching device of state, inevitably causes voltage and current to exist There is transition in short time, produce abundant higher hamonic wave, its electromagnetic energy is with the side of circuit connection or electromagnetic wave space coupling Formula forms electromagnetic interference, and the signal frequency of interference noise, from several khz to tens of mhz, affects the normal operation of electric system itself The normal work of electrical system around, makes device not reach the requirement that electromagnetic compatibility standard specifies.With pwm power The high frequency common mode voltage that converter produces, it can induce high shaft voltage on machine shaft, and forms shaft current, makes electronic The bearing of machine damages in a short time, shortens motor service life.And, electromagnetic interference makes whole motor driven systems reliability Decline, fault rate increases, and affects the other electrical equipments on electrical network.
Content of the invention
The invention aims to solving existing electromagnetic interference influence motor driven systems reliability decrease, fault rate increases High it is impossible to reach the problem of electromagnetic compatibility standard, there is provided a kind of passive suppression side of pwm power inverter Conducted Electromagnetic Interference Method.
The passive suppressing method of pwm power inverter Conducted Electromagnetic Interference of the present invention, this suppressing method is using two Filter topology is connected in pwm power inverter, and filter topology design process is:
Step one, using receiver, the Conduction Interference of pwm power inverter is measured, obtains electromagnetic interference frequency spectrum, Described electromagnetic interference frequency spectrum includes common mode disturbances frequency spectrum and DM EMI frequency spectrum；
Step 2, common mode disturbances frequency spectrum and DM EMI frequency spectrum are launched with the Conduction Interference of pwm power inverter respectively Limit graph subtracts each other, and obtains common mode frequency spectrum and the differential mode frequency spectrum of filter attenuation；
The turnover frequency of the frequency acquisition differential mode noise at step 3, the amplitude peak according to decay and amplitude and common-mode noise Rate；
Step 4, affected to obtain common mode by common-mode voltage fundamental frequency according to the magnetic flux degree of saturation of common mode inductance coil Inductance value；
Step 5, according to differential mode noise, the corner frequency of common-mode noise and common mode inductance value obtain common mode capacitance value；
Step 6, the circulation path to common mode disturbances and DM EMI set up equivalent circuit, respectively according to common mode inductance value Obtain inductance value and the capacitance needed for wave filter with common mode capacitance value, obtain filter topology.
Filter topology described in step 6 is: the first wave filter includes three common mode inductance lcm1, resistance rp1、 rp2、rp3, inductance ldm1、ldm2、ldm3, electric capacity ccm1, resistance rcm1With electric capacity c1、c2、c3；Second wave filter includes three common mode electricity Sense lcm2, y meet electric capacity ccm2、ccm3、ccm4With resistance rcm2；
The passive restraining device of pwm power inverter Conducted Electromagnetic Interference also includes AC power, rectifier, two direct current mothers Line capacitance, inverter, long cable, motor, the first wave filter and the second wave filter；The alternating current output end of AC power connects The exchange electrical input of rectifier, the rectification output end of rectifier connects one end of two dc-link capacitances respectively, and two straight The other end of stream bus capacitor connects the DC supply input end of inverter, and the inversion alternating current output end of inverter passes through long line electricity Cable exports to motor；
Three common mode inductance l in first wave filtercm1Same Name of Ends u, v, w connect inverter inversion alternating current output end, Three common mode inductance lcm1Different name end connect resistance r respectivelyp1、rp2、rp3One end, resistance rp1、rp2、rp3The other end respectively Connect inductance ldm1、ldm2、ldm3One end, inductance ldm1、ldm2、ldm3Other end u1、v1、w1Pass through long cable and electricity respectively Machine is connected, inductance ldm1、ldm2、ldm3The other end be simultaneously connected with electric capacity c1、c2、c3One end, electric capacity c1、c2、c3The other end even Connecting resistance rcm1One end, resistance rcm1The other end connect electric capacity ccm1One end, electric capacity ccm1Other end o ' be connected to direct current Bus clamper midpoint；
Three common mode inductance l in second wave filtercm2Same Name of Ends a, b, c connect rectifier exchange electrical input, three Common mode inductance lcm2Different name end a1、b1、c1Connect the alternating current output end of AC power (1), common mode inductance lcm2Different name end with When connect y meet electric capacity ccm2、ccm3、ccm4One end, y meets electric capacity ccm2、ccm3、ccm4The other end connect resistance rcm2One end, electricity Resistance rcm2Other end m ' be connected between the neutral point of motor.
The passive suppressing method of pwm power inverter Conducted Electromagnetic Interference of the present invention is opened up using two emi wave filters Flutter structure to be improved on the basis of traditional lc, lrc wave filter.The effect of the first passive filter has two: first It is for suppressing the common-mode voltage between pwm power inverter outlet side and motor, and then suppress motor shaft voltage；Second is to use High frequency differential mode voltage between suppression pwm power inverter outlet side triple line-line, and, can also go out for motor terminals Existing overvoltage plays attenuation；Every voltage between line and neutral point is not accessed by this wave filter and is affected, between line-line Voltage waveform is still sine wave curve.Second passive filter is used for the common mode suppressing pwm power inverter to exchange input side Voltage, prevents from polluting electrical network by the interference that power inverter produces.The nothing being made up of two filter constructions proposed by the present invention Source filter topology collective effect, the common-mode voltage in suppression pwm motor driven systems, differential mode voltage and shaft voltage, overall Reach system conductive electromagnetic interference not exceeded.
The present invention than in the passive suppressing method of traditional pwm power inverter Conducted Electromagnetic Interference, still from differential mode and common mode Angle carry out separately designing common-mode filter device and differential mode filter, but due to consider wave filter connected mode when, connect Enter power inverter exchange input side, dc bus clamper midpoint, motor side, generator neutral point, so in suppression conduction electricity While magnetic disturbance, also eliminate some negative effects of system generation, including overvoltage and motor shaft voltage.
Brief description
Fig. 1 is the structured flowchart of the passive restraining device of pwm power inverter Conducted Electromagnetic Interference；
Fig. 2 is the schematic diagram of the first wave filter of the present invention；
Fig. 3 is the schematic diagram of the second wave filter of the present invention；
Fig. 4 is suppression common mode electromagnetic interference propagation path figure in the pwm power inverter be provided without wave filter of the present invention, its 1. middle single arrow represents path, and 2. double-head arrow represents path, and 3. three arrows represent path, and a represents system ground wire, and b represents motor Ground wire, c represents fin ground wire；
Fig. 5 is using suppression common mode electromagnetic interference propagation path figure in the pwm power inverter of wave filter of the present invention, wherein 4. four arrows represent path, and 5. five arrows represent path, and 6. six arrows represent path, and a represents system ground wire, and b represents motor ground Line, c represents fin ground wire；
Fig. 6 is electromagnetic interference frequency spectrum phase line in the measurement of pwm power inverter being produced using receiver；
Fig. 7 is electromagnetic interference frequency spectrum center line in the measurement of pwm power inverter being produced using receiver；
Fig. 8 is the Conduction Interference Emission Limits curve of pwm power inverter, and curve a represents mid power transmission system, bent Line b represents small-power transmission system；
Fig. 9 is the common mode spectrogram that wave filter needs decay；
Figure 10 is the differential mode spectrogram that wave filter needs decay；
Figure 11 is the pwm power inverter Conducted Electromagnetic Interference launching curve figure being provided without wave filter of the present invention；
Figure 12 is the pwm power inverter Conducted Electromagnetic Interference launching curve figure using wave filter of the present invention.
Specific embodiment
Specific embodiment one: with reference to Fig. 1-Fig. 3, Fig. 6-Figure 10, present embodiment is described, described in present embodiment The passive suppressing method of pwm power inverter Conducted Electromagnetic Interference, this suppressing method is to be connected using two filter topology To in pwm power inverter, filter topology design process is:
Step one, using receiver, the Conduction Interference of pwm power inverter is measured, obtains electromagnetic interference frequency spectrum, Described electromagnetic interference frequency spectrum includes common mode disturbances frequency spectrum and DM EMI frequency spectrum；
Step 2, common mode disturbances frequency spectrum and DM EMI frequency spectrum are launched with the Conduction Interference of pwm power inverter respectively Limit graph subtracts each other, and obtains common mode frequency spectrum and the differential mode frequency spectrum of filter attenuation；
The turnover frequency of the frequency acquisition differential mode noise at step 3, the amplitude peak according to decay and amplitude and common-mode noise Rate；
Step 4, affected to obtain common mode by common-mode voltage fundamental frequency according to the magnetic flux degree of saturation of common mode inductance coil Inductance value；
Step 5, according to differential mode noise, the corner frequency of common-mode noise and common mode inductance value obtain common mode capacitance value；
Step 6, the circulation path to common mode disturbances and DM EMI set up equivalent circuit, respectively according to common mode inductance value Obtain inductance value and the capacitance needed for wave filter with common mode capacitance value, obtain filter topology.
Specific embodiment two: with reference to Fig. 2, present embodiment is described, present embodiment is made into one to embodiment one Step explanation, the corner frequency f of the differential mode noise described in step 3 and common-mode noisecmFor:
Wherein: acnoiseRepresent the amplitude peak of decay, f0Represent the frequency at amplitude.
Specific embodiment three: with reference to Fig. 2, present embodiment is described, present embodiment is made into one to embodiment one Step explanation, described in step 4, the detailed process of acquisition common mode inductance parameter value is:
Step 4 one, according to Faraday's electromagnetic induction law, inductive magnetic flux φ and common-mode voltage ucmRelation be:
Wherein: n represents the inductance coil number of turn；
Step 4 two, acquisition magnetic flux density b are:
Wherein: s represents that the effective cross section of inductance coil iron core is amassed；
Step 4 three, acquisition common mode inductance value lcmFor:
Wherein: l represents the average length of inductance coil iron circuit, μ represents inductance coil iron core magnetic Conductance.
In present embodiment, common mode inductance value major consideration is that the magnetic flux degree of saturation of common mode inductance coil is subject to common mode The impact of voltage fundamental frequency, other radio-frequency components are ignored.In the case that carrier frequency is certain, if known common mode is electric Pressure value, then, peakflux density bmaxValue just determined by the product sn of s and n, generally, ensureing that maximum magnetic flux is close Degree bmaxValue be less than selected core material saturation flux density bsat, the product of sn can select multiple different Value.What the present invention selected is the core material as common mode inductance coil for the soft magnetic materials, and this material has crystal structure, and it is satisfied Reach as high as b with magnetic flux densitysat=1.2t.The peak value i of common mode currentcmpeakWith common mode inductance value lcmBetween pass be tied to form instead Than it may be assumed that in the case of sn product is certain, inductance value lcmIt is directly proportional to l, is inversely proportional to n, be i.e. the average length of inductor core magnetic circuit L is shorter, and coil turn n is more, the peak value i of common mode currentcmpeakLess.Therefore common mode inductance value is determined according to this relation Size.But, the number of turn of inductance coil can not unconfined increase, coil turn is more, and the iron core of inductance is just corresponding Bigger, this also just increases average length l of iron circuit.So, the determination of l/n value is had to consider many The factor of aspect, obtains optimized value.So, the value of l/n should be determined by the rated current of common mode inductance, that is, by The diameter of the copper winding that inductance coil is adopted determining, so, the present invention selects the iron that soft magnetic materials is common mode inductance coil Core material, its saturation flux density maximum is bsat=1.2t, takes the b that frequency is inductance during 40hzmaxFor 0.8t, it is bsat's 2/3.
Specific embodiment four: with reference to Fig. 2, present embodiment is described, present embodiment is made into one to embodiment one Step explanation, acquisition common mode capacitance value c described in step 5cmFor:
f c m = 1 2 π l c m c c m .
Specific embodiment five: with reference to Fig. 1-Fig. 3, present embodiment is described, present embodiment is made to embodiment one Further illustrate, the filter topology described in step 6 is: the first wave filter 7 includes three common mode inductance lcm1, resistance rp1、rp2、rp3, inductance ldm1、ldm2、ldm3, electric capacity ccm1, resistance rcm1With electric capacity c1、c2、c3；Second wave filter 8 includes three altogether Mould inductance lcm2, y meet electric capacity ccm2、ccm3、ccm4With resistance rcm2；
The passive restraining device of pwm power inverter Conducted Electromagnetic Interference also includes AC power 1,2, two direct currents of rectifier Bus capacitor 3, inverter 4, long cable 5, motor 6, the first wave filter 7 and the second wave filter 8；The alternating current of AC power 1 Output end connects the exchange electrical input of rectifier 2, and the rectification output end of rectifier 2 connects two dc-link capacitances 3 respectively One end, the other end of two dc-link capacitances 3 connects the DC supply input end of inverter 4, the inversion alternating current of inverter 4 Output end is exported to motor 6 by long cable 5；
Three common mode inductance l in first wave filter 7cm1Same Name of Ends u, v, w connect inverter 4 inversion exchange electricity output End, three common mode inductance lcm1Different name end connect resistance r respectivelyp1、rp2、rp3One end, resistance rp1、rp2、rp3The other end divide Lian Jie not inductance ldm1、ldm2、ldm3One end, inductance ldm1、ldm2、ldm3Other end u1、v1、w1Pass through respectively long cable 5 with Motor 6 is connected, inductance ldm1、ldm2、ldm3The other end be simultaneously connected with electric capacity c1、c2、c3One end, electric capacity c1、c2、c3Another End connects resistance rcm1One end, resistance rcm1The other end connect electric capacity ccm1One end, electric capacity ccm1Other end o ' be connected to Dc bus clamper midpoint；
Three common mode inductance l in second wave filter 8cm2Same Name of Ends a, b, c connect rectifier 2 exchange electrical input, three Individual common mode inductance lcm2Different name end a1、b1、c1Connect the alternating current output end of AC power 1, common mode inductance lcm2Different name end with When connect y meet electric capacity ccm2、ccm3、ccm4One end, y meets electric capacity ccm2、ccm3、ccm4The other end connect resistance rcm2One end, electricity Resistance rcm2Other end m ' be connected between the neutral point of motor 6.
Specific embodiment six: with reference to Fig. 2, present embodiment is described, present embodiment is made into one to embodiment five Step explanation, electric capacity c in the first wave filter 7cm1For 470nf, common mode inductance lcm1For 25mh, resistance rcm1Value according to resistance rp1= rp2=rp3=rpCharacteristic impedance determine, as resistance rp1=rp2=rp3=rpDuring for 210 ω, resistance rcm1For 20 ω, inductance ldm1 =ldm2=ldm3=ldmFor 2.1mh, electric capacity c1=c2=c3For 3.7 μ f.
Specific embodiment seven: with reference to Fig. 2, present embodiment is described, present embodiment is made into one to embodiment five Step explanation, common mode inductance l in the second wave filter 8cm2For 300 μ h, electric capacity y meets electric capacity ccm2=ccm3=ccm4For 47nf, resistance rcm2 For 100 ω.
In conjunction with Fig. 4 and Fig. 5, the propagation path of electromagnetic interference in pwm power inverter is analyzed, contrast is provided without this The circulation path invented described filter topologies and disturb during using filter topologies of the present invention, verifies designed in the present invention Passive filter topological structure and its mode of connection effect to AF panel.
In pwm power inverter, it is carried out radiator is installed in order in switching tube normal work, Ensure that it will not lose efficacy because overheated.Install radiator when, typically all can the metal shell of its metallic power converter with Add heat conductive insulating medium in radiator, both is isolated to prevent from being short-circuited；On the other hand, radiator is connect by cabinet Ground.So, just inevitably define a larger parasitic capacitance between power inverter and radiator, by this parasitism Electric capacity just constitutes a propagation path of power inverter Conducted Electromagnetic Interference.In pwm motor system, power conversion Rectifier bridge in device and inverter all have common mode current and radiator between, form the propagation path of Conducted Electromagnetic Interference, Both differences are that the change of rectifier bridge side common mode current does not have the frequency of inverter side high.
In pwm motor system, the propagation path of Conducted Electromagnetic Interference also includes induction machine.The stator of motor around Equally exist larger parasitic capacitance between group and motor case, and motor case also as radiator with the earth phase Connect, this just provides path for Conducted Electromagnetic Interference.So, when power inverter switching device high speed turns on and off, Cause voltage in the short time, current transients, form the common-mode voltage of high frequency, this high frequency common mode voltage will be to motor stator Parasitic capacitance between winding and casing charges and discharges, and is the formation of the Conducted Electromagnetic Interference propagation path of motor side. In addition, in practical engineering application, typically with long cable connection between power inverter and motor, this when, long line electricity Distribution capacity between cable and ground is also the circulation path of common mode current.
Additionally, in pwm power conversion system, the circulation path of Conducted Electromagnetic Interference common mode current also includes: system becomes Depressor neutral point, power inverter connect the distribution capacity over the ground of the cable of grid side.Wherein, system transformer neutral point is altogether The main circulation path of mould electric current, the common mode current amplitude that different cable connection forms produces is also different.If passing through cable When transformer neutral point is directly grounded, relatively large common mode current will be produced；If transformer is neutral by resistance When point is indirect earthed, smaller common mode current will be produced.In addition, Conducted Electromagnetic Interference connects electrical network by power inverter The common mode current that distribution capacity between side cable and ground is formed, its size is relevant with the size of distribution capacity.
Therefore, in pwm power conversion system, the route of transmission of Conducted Electromagnetic Interference common mode current may refer to Fig. 4, including 3 Bar propagation path:
Propagation path circulation path 1. is: through inverter, cable, motor parasitic capacitance, motor ground wire, system ground wire, Main power source, rectifier bridge, finally return to inverter.
Propagation path circulation path 2. is: through inverter, cable, motor parasitic capacitance, motor ground wire, radiator ground Line, fin, inverter parasitic capacitance, finally return to inverter.
Propagation path circulation path 3. is: through inverter, rectifier bridge parasitic capacitance, radiator, radiator ground wire, system Ground wire, main power source, rectifier, finally return to inverter.
Wherein, in power inverter the cp1 of the parasitic capacitance between rectifier bridge and radiator represent, the common mode of rectifier bridge side Voltage ucmrec represents, in power inverter the parasitic capacitance between inverter and radiator cp represent, inverter side Common-mode voltage is represented with ucminv.
Insert proposed by the invention two filter topologies Fig. 2 and Fig. 3 in pwm power conversion system, re-establish The common mode equivalent circuit of system, shown in Figure 5.System when not adding wave filter involved in the present invention in Fig. 4 analysis On the basis of Conducted Electromagnetic Interference propagation path, analyze the suppression common mode electromagnetic interference route of transmission after insertion wave filter, that is, in Fig. 5 Path 4., path 5. with path 6.:
Propagation path circulation path 4. is: through inverter, common mode inductance (lcm1), differential mode inductance (ldm1/3), electric capacity (3c1), dc bus, returns inverter.
Propagation path circulation path 5. is: through inverter, inverter parasitic capacitance, radiator, radiator ground wire, motor Ground wire, motor center line, (rcm2 and 3ccm2), common mode inductance (lcm2), return inverter.
Propagation path circulation path 6. is: through inverter, common mode inductance (lcm1), differential mode inductance ldm1/3, long line electricity Cable, motor center line, (rcm2 and 3ccm2), common mode inductance (lcm2), return inverter.
Clearly it can be seen that in Figure 5, the purpose adding common mode inductance lcm1 is to suppress power inverter to export The common mode current of side, and the purpose that common mode inductance lcm2 is inserted in rectifier bridge AC is to suppress power inverter input side The namely common mode current of rectifier bridge AC.
The route of transmission of common mode disturbances description 4., 5. and 6. after the wave filter proposed by the invention to addition, can Clearly to find out the suppression effect to common-mode voltage in pwm power converter system for proposed by the invention two wave filter Really.
Set up three phase rectifier-inversion-electric system checking pwm power inverter proposed by the present invention conduction electromagnetism below to do Disturb the inhibition to the Conducted Electromagnetic Interference producing in pwm power conversion system for the passive restraining device.
Verification condition is: rectifier bridge model mds30a/1600v；Ipm model ps21867 (30a/600v)；Inverter Switching frequency is set to 10khz, and modulation ratio is 0.8；Induction machine selected by motor, its model j02-32-2, and rated voltage is 380v, rated frequency is 50hz, and rated power is 4kw, and rated speed is 2882 revs/min.
The resonant frequency of the common mode disturbances that need to decay is 1.5khz, and the resonant frequency of the DM EMI that need to decay is 1.8khz.In addition present invention during checking, the first wave filter 7 parameter setting is: electric capacity ccm1For 470nf, common mode inductance lcm1For 25mh, resistance rcm1Value according to resistance rp1=rp2=rp3=rpCharacteristic impedance determine, as resistance rp1=rp2=rp3=rpFor During 210 ω, resistance rcm1For 20 ω, inductance ldm1=ldm2=ldm3=ldmFor 2.1mh, electric capacity c1=c2=c3For 3.7 μ f.Second Wave filter 8 parameter setting is: common mode inductance l in the second wave filter 8cm2For 300 μ h, electric capacity y meets electric capacity ccm2=ccm3=ccm4For 47nf, resistance rcm2For 100 ω.
Do not use the pwm power inverter Conducted Electromagnetic Interference frequency spectrum of restraining device of the present invention as shown in figure 11, from figure In 11 it can be seen that the Conducted Electromagnetic Interference that produces of system in Conducted Electromagnetic Interference band limits, (150hz～30mhz) all not Up to standard.
After accessing the passive restraining device of pwm power inverter Conducted Electromagnetic Interference of the present invention, measure the conduction electricity obtaining As shown in figure 12, contrast Figure 12 is it can be seen that the Conducted Electromagnetic Interference that now system produces is all in standard for magnetic disturbance frequency spectrum In the range of the Emission Limits that en55011 specifies, it can also be seen that the interference that the frequency in interference strength produces is sent out from Figure 12 Penetrate value also 10db more than lower than the limit value that standard specifies, inhibition obvious it is shown that passive filter proposed by the present invention The validity of ripple device.

Claims (6)

  1. The passive suppressing method of 1.pwm power inverter Conducted Electromagnetic Interference is it is characterised in that this suppressing method is to be filtered using two Ripple device topological structure is connected in pwm power inverter, and filter topology design process is:
    Step one, using receiver, the Conduction Interference of pwm power inverter is measured, obtain electromagnetic interference frequency spectrum, described Electromagnetic interference frequency spectrum includes common mode disturbances frequency spectrum and DM EMI frequency spectrum；
    Step 2, by common mode disturbances frequency spectrum and the DM EMI frequency spectrum Conduction Interference Emission Limits with pwm power inverter respectively Curve subtracts each other, and obtains common mode frequency spectrum and the differential mode frequency spectrum of filter attenuation；
    Frequency acquisition differential mode noise at step 3, the amplitude peak according to decay and amplitude and the corner frequency of common-mode noise；
    Step 4, according to common mode inductance coil flux degree of saturation by common-mode voltage fundamental frequency affected obtain common mode inductance Value；
    Step 5, according to differential mode noise, the corner frequency of common-mode noise and common mode inductance value obtain common mode capacitance value；
    Step 6, the circulation path to common mode disturbances and DM EMI set up equivalent circuit respectively, according to common mode inductance value with altogether Mould capacitance obtains the inductance value and capacitance needed for wave filter, obtains filter topology；
    The detailed process obtaining common mode inductance parameter value described in step 4 is:
    Step 4 one, according to Faraday's electromagnetic induction law, inductive magnetic flux φ and common-mode voltage ucmRelation be:
    Wherein: n represents the inductance coil number of turn；
    Step 4 two, acquisition magnetic flux density b are:
    Wherein: s represents that the effective cross section of inductance coil iron core is amassed；
    Step 4 three, acquisition common mode inductance value lcmFor:
    Wherein: l represents the average length of inductance coil iron circuit, μ represents inductance coil iron core magnetic conductance Rate.
  2. 2. according to claim 1 the passive suppressing method of pwm power inverter Conducted Electromagnetic Interference it is characterised in that step The corner frequency f of the differential mode noise described in three and common-mode noisecmFor:
    Wherein: acnoiseRepresent the amplitude peak of decay, f0Represent the frequency at amplitude.
  3. 3. according to claim 1 the passive suppressing method of pwm power inverter Conducted Electromagnetic Interference it is characterised in that step Common mode capacitance value c is obtained described in fivecmFor:
    fcmRepresent the corner frequency of differential mode noise and common-mode noise.
  4. 4. according to claim 1 the passive suppressing method of pwm power inverter Conducted Electromagnetic Interference it is characterised in that step Filter topology described in six is:
    First wave filter (7) includes three common mode inductance lcm1, resistance rp1、rp2、rp3, inductance ldm1、ldm2、ldm3, electric capacity ccm1, electricity Resistance rcm1With electric capacity c1、c2、c3；Second wave filter (8) includes three common mode inductance lcm2, y meet electric capacity ccm2、ccm3、ccm4And resistance rcm2；
    The passive restraining device of pwm power inverter Conducted Electromagnetic Interference also includes AC power (1), rectifier (2), two direct currents Bus capacitor (3), inverter (4), long cable (5), motor (6), the first wave filter (7) and the second wave filter (8)；Alternating current The alternating current output end in source (1) connects the exchange electrical input of rectifier (2), and the rectification output end of rectifier (2) connects respectively One end of two dc-link capacitances (3), the direct current of other end connection inverter (4) of two dc-link capacitances (3) is defeated Enter end, the inversion alternating current output end of inverter (4) is exported to motor (6) by long cable (5)；
    Three common mode inductance l in first wave filter (7)cm1Same Name of Ends u, v, w connect inverter (4) inversion exchange electricity output End, three common mode inductance lcm1Different name end connect resistance r respectivelyp1、rp2、rp3One end, resistance rp1、rp2、rp3The other end divide Lian Jie not inductance ldm1、ldm2、ldm3One end, inductance ldm1、ldm2、ldm3Other end u1、v1、w1Pass through long cable (5) respectively It is connected with motor (6), inductance ldm1、ldm2、ldm3The other end be simultaneously connected with electric capacity c1、c2、c3One end, electric capacity c1、c2、c3's The other end connects resistance rcm1One end, resistance rcm1The other end connect electric capacity ccm1One end, electric capacity ccm1Other end o ' even It is connected to dc bus clamper midpoint；
    Three common mode inductance l in second wave filter (8)cm2Same Name of Ends a, b, c connect rectifier (2) exchange electrical input, three Individual common mode inductance lcm2Different name end a1、b1、c1Connect the alternating current output end of AC power (1), common mode inductance lcm2Different name end It is simultaneously connected with y and meet electric capacity ccm2、ccm3、ccm4One end, y meets electric capacity ccm2、ccm3、ccm4The other end connect resistance rcm2One end, electricity Resistance rcm2Other end m ' be connected between the neutral point of motor (6).
  5. 5. according to claim 4 the passive suppressing method of pwm power inverter Conducted Electromagnetic Interference it is characterised in that first Electric capacity c in wave filter (7)cm1For 470nf, common mode inductance lcm1For 25mh, resistance rcm1Value according to resistance rp1=rp2=rp3= rpCharacteristic impedance determine, as resistance rp1=rp2=rp3=rpDuring for 210 ω, resistance rcm1For 20 ω, inductance ldm1=ldm2= ldm3=ldmFor 2.1mh, electric capacity c1=c2=c3For 3.7 μ f.
  6. 6. according to claim 4 the passive suppressing method of pwm power inverter Conducted Electromagnetic Interference it is characterised in that second Common mode inductance l in wave filter (8)cm2For 300 μ h, electric capacity y meets electric capacity ccm2=ccm3=ccm4For 47nf, resistance rcm2For 100 ω.
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