CN104270002A - 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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CN104270002A
CN104270002A CN201410578298.4A CN201410578298A CN104270002A CN 104270002 A CN104270002 A CN 104270002A CN 201410578298 A CN201410578298 A CN 201410578298A CN 104270002 A CN104270002 A CN 104270002A
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common mode
filter
inductance
electric capacity
resistance
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CN104270002B (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 converter Conducted Electromagnetic Interference
Technical field
The invention belongs to drive and control of electric machine and the field of electromagnetic compatibility of integrated motor system.
Background technology
Power electronic equipment is more and more widely used in industry and people's life, although it improves in industrial automatization and human habitat etc. in energy-conservation, improvement shown larger advantage, but, because power electronic equipment relies on electromagnetic energy to carry out work, some useful or useless electromagnetic energies emit when they run, form electromagnetic interference, the normal work of other equipment in influential system.Thus, along with the development of power electronic technology, electromagnetic compatibility problem has also day by day highlighted.
By the description that GJB72-1985 " electromagnetic interference and Electro Magnetic Compatibility term " defines electromagnetic compatibility, Electro Magnetic Compatibility comprises two aspects, on the one hand, equipment in same electromagnetic environment or system can normally work, on the other hand, the electromagnetic interference of equipment or system its own transmission can not form the electromagnetic interference that in this environment, other equipment can not bear.Namely each equipment (system, subsystem) be in same environment can perform respective function and normally work, and keeps coexisting state.Here electromagnetic ambient level is jointly formed by electromagnetic energy that is artificial and natural disturbance source, is in the experimental situation of regulation with in the time, when be energized to Device under test, the radiation of existence and the value of conducted interference in surrounding space and electrical network.As can be seen from the definition of electromagnetic compatibility, electromagnetic compatibility comprises the content of two aspects, demand fulfillment electromagnetic susceptibility requirement on the one hand, and namely equipment (system, subsystem) normally can run under the electromagnetic environment of regulation; Demand fulfillment electromagnetic emission requirement on the other hand, the electromagnetic interference that namely equipment (system, subsystem) itself produces also can not affect the normal operation of other equipment.
The definition of electromagnetic disturbance and electromagnetic interference is distinguishing, and the former is a kind of electromagnet phenomenon, and this electromagnet phenomenon may reduce the performance of unit and system, or may damage life or abiotic material; The latter refers to the normal work that have impact on unit or system, causes the electromagnet phenomenon of its hydraulic performance decline; In other words, electromagnetic interference is the consequence that electromagnetic disturbance causes, and electromagnetic interference is also electromagnetic disturbance.Electromagnetic interference has very large harmfulness, can affect the normal operation of unit and system, shorten its useful life; Affect the normal transmission of signal, be that makeing mistakes appears in the information transmitted, the problem such as distortion and leakage; The improper phenomenon such as also may cause misoperation or do not work in equipment operating process; Human body self also can be subject to the impact of electromagnetic radiation, upsets the normal life of people.
From 20 beginnings of the century, various countries just start formulate and improve electromagnetic compatibility standard, and up to the present defined a complete standards system, electromagnetic compatibility standard generally can be divided into basic standard, the universal standard and product class standard etc.International wireless electricity special committee standard, International Electrotechnical Commission's series standard, the establishment in succession of the tissue such as the EN series standard of European Union, exactly because also international community pays much attention to electromagnetic compatibility problem.And at home, also start to have formulated corresponding electromagnetic compatibility standard successively from the eighties in 20th century.First be that military project department started to formulate my army's standard with reference to American army mark MIL-STD-461B and MIL-STD-462B in nineteen eighty-two, and promulgated that in 1986 army universal standard GJB151-1986 and GJB152-1986 general bureau of national quality technical supervision subsequently set up national radio interference standard technical committee in 1985, and corresponding industry standard and national standard are formulated successively with reference to CISPR and IEC standard.The electromagnetic compatibility standard major part of current China is drawn close mutually with international standard, and e.g., China have references to most CISPR standard, is brought into national standard.New military standard GJB151A-1997 within 1997, are formulated 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 improve China electromagnetic compatibility level, improve electromagnetic environment and create condition, also promote the research and development of China's electromagnetic compatibility.
Along with the develop rapidly of power electronic technology, the power inverter that have employed pulse-width modulation strategy (PWM) is widely used in motor driven systems, the larger performance index that improve electric system.But power inverter is while controlling electric energy and converting, its high speed turns on and off state of switch device, voltage and current is inevitably caused at short notice transition to occur, produce abundant high order harmonic component, its electromagnetic energy connects with circuit or the mode of electromagnetic wave space coupling forms electromagnetic interference, the signal frequency of interference noise is from a few kHz to tens of MHz, affect the normal operation of electric system self and the normal work of surrounding electrical system, the requirement making equipment or device not reach electromagnetic compatibility standard to specify.Along with the high frequency common mode voltage that pwm power converter produces, its can induce high shaft voltage on machine shaft, and forms shaft current, and the bearing of motor is damaged in a short time, shortens motor useful life.And electromagnetic interference makes whole motor driven systems reliability decrease, failure rate increases, and affects other power consumption equipment on electrical network.
Summary of the invention
The present invention seeks to solve existing electromagnetic interference influence motor driven systems reliability decrease, failure rate increases, the problem of electromagnetic compatibility standard cannot be reached, provide the passive suppressing method of a kind of pwm power converter Conducted Electromagnetic Interference.
The passive suppressing method of pwm power converter Conducted Electromagnetic Interference of the present invention, this suppressing method is that employing two filter topology are connected in pwm power converter, and filter topology design process is:
Step one, utilize the conducted interference of receiver to pwm power converter to measure, obtain electromagnetic interference frequency spectrum, described electromagnetic interference frequency spectrum comprises common mode disturbances frequency spectrum and differential mode interference frequency spectrum;
Step 2, common mode disturbances frequency spectrum and differential mode interference frequency spectrum to be subtracted each other with the conducted interference Emission Limits curve of pwm power converter respectively, obtain common mode frequency spectrum and the differential mode frequency spectrum of filter attenuation;
Step 3, according to the amplitude peak of decay and the frequency acquisition differential mode noise at amplitude place and the corner frequency of common-mode noise;
Step 4, obtain common mode inductance value according to the Flux saturation degree of common mode inductance coil by the impact of common-mode voltage first-harmonic frequency;
Step 5, obtain common mode capacitance value according to the corner frequency of differential mode noise, common-mode noise and common mode inductance value;
Step 6, respectively equivalent electric circuit is set up to the circulation path of common mode disturbances and differential mode interference, obtain inductance value needed for filter and capacitance according to common mode inductance value and common mode capacitance value, obtain filter topology.
Filter topology described in step 6 is: the first filter comprises three common mode inductance L cM1, resistance R p1, R p2, R p3, inductance L dM1, L dM2, L dM3, electric capacity C cM1, resistance R cM1with electric capacity C 1, C 2, C 3; Second filter comprises three common mode inductance L cM2, Y meets electric capacity C cM2, C cM3, C cM4with resistance R cM2;
The passive restraining device of pwm power converter Conducted Electromagnetic Interference also comprises AC power, rectifier, two dc-link capacitances, inverter, long cable, motor, the first filter and the second filters; The alternating current output of AC power connects the alternating current input of rectifier, the rectification output end of rectifier connects one end of two dc-link capacitances respectively, the other end of two dc-link capacitances connects the direct current input of inverter, and the inversion alternating current output of inverter exports motor to by long cable;
Three common mode inductance L in first filter cM1same Name of Ends U, V, W connect the inversion alternating current output of inverter, three common mode inductance L cM1different name end respectively contact resistance R p1, R p2, R p3one end, resistance R p1, R p2, R p3the other end connect inductance L respectively dM1, L dM2, L dM3one end, inductance L dM1, L dM2, L dM3other end U 1, V 1, W 1be connected with motor respectively by long cable, inductance L dM1, L dM2, L dM3the other end connect electric capacity C simultaneously 1, C 2, C 3one end, electric capacity C 1, C 2, C 3other end contact resistance R cM1one end, resistance R cM1the other end connect electric capacity C cM1one end, electric capacity C cM1other end O ' be connected to DC bus clamper mid point;
Three common mode inductance L in second filter cM2same Name of Ends A, B, C connect the alternating current input of rectifier, three common mode inductance L cM2different name end A 1, B 1, C 1connect the alternating current output of AC power (1), common mode inductance L cM2different name end connect Y simultaneously and meet electric capacity C cM2, C cM3, C cM4one end, Y meets electric capacity C cM2, C cM3, C cM4other end contact resistance R cM2one end, resistance R cM2other end M ' be connected between the neutral point of motor.
The passive suppressing method of pwm power converter Conducted Electromagnetic Interference of the present invention adopts two electromagnetic interface filter topological structures to improve on the basis of traditional LC, LRC filter.The effect of the first passive filter has two: the first to be common-mode voltage for suppressing between pwm power converter outlet side and motor, and then suppresses motor shaft voltage; Second is the high frequency differential mode voltage for suppressing between pwm power converter outlet side triple line-line, and the overvoltage that can also occur for motor terminals plays attenuation; Voltage between every line and neutral point is not by the impact of this filter access, and the voltage waveform between line-line is still sine wave curve.The common-mode voltage of the second passive filter for suppressing pwm power converter to exchange input side, prevents the interference produced by power inverter from polluting electrical network.The passive filter be made up of two filter constructions topology acting in conjunction that the present invention proposes, suppress common-mode voltage, differential mode voltage and the shaft voltage in PWM motor driven systems, entirety reaches system conductive electromagnetic interference and does not exceed standard.
The present invention's ratio is in the passive suppressing method of conventional P WM power inverter Conducted Electromagnetic Interference, still common-mode filter device and differential mode filter is designed respectively from the angle of differential mode and common mode, but due to when considering filter connected mode, access power inverter and exchange input side, DC bus clamper mid point, motor side, generator neutral point, so while suppression Conducted Electromagnetic Interference, also eliminate some negative effects that system produces, comprise overvoltage and motor shaft voltage.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the passive restraining device of pwm power converter Conducted Electromagnetic Interference;
Fig. 2 is the schematic diagram of the first filter of the present invention;
Fig. 3 is the schematic diagram of the second filter of the present invention;
Fig. 4 is common mode electromagnetic interference propagation path figure in the pwm power converter not adopting filter of the present invention, and wherein single arrow represents that path 1., and double-head arrow represents that path 2., three arrows represent that path 3., a represents system ground wire, and b represents motor ground wire, and c represents fin ground wire;
Fig. 5 is common mode electromagnetic interference propagation path figure in the pwm power converter adopting filter of the present invention, and wherein four arrows represent that path 4., and five arrows represent that path 5., six arrows represent that path 6., a represents system ground wire, and b represents motor ground wire, and c represents fin ground wire;
Fig. 6 is the electromagnetic interference frequency spectrum that in utilizing receiver to measure pwm power converter, phase line produces;
Fig. 7 is the electromagnetic interference frequency spectrum that in utilizing receiver to measure pwm power converter, center line produces;
Fig. 8 is the conducted interference Emission Limits curve of pwm power converter, and curve A represents mid power drive system, and curve B represents small-power drive system;
Fig. 9 is the common mode spectrogram that filter needs decay;
Figure 10 is the differential mode spectrogram that filter needs decay;
Figure 11 is the pwm power converter Conducted Electromagnetic Interference launching curve figure not adopting filter of the present invention;
Figure 12 is the pwm power converter Conducted Electromagnetic Interference launching curve figure adopting filter of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1-Fig. 3, Fig. 6-Figure 10, the passive suppressing method of pwm power converter Conducted Electromagnetic Interference described in present embodiment, this suppressing method is that employing two filter topology are connected in pwm power converter, and filter topology design process is:
Step one, utilize the conducted interference of receiver to pwm power converter to measure, obtain electromagnetic interference frequency spectrum, described electromagnetic interference frequency spectrum comprises common mode disturbances frequency spectrum and differential mode interference frequency spectrum;
Step 2, common mode disturbances frequency spectrum and differential mode interference frequency spectrum to be subtracted each other with the conducted interference Emission Limits curve of pwm power converter respectively, obtain common mode frequency spectrum and the differential mode frequency spectrum of filter attenuation;
Step 3, according to the amplitude peak of decay and the frequency acquisition differential mode noise at amplitude place and the corner frequency of common-mode noise;
Step 4, obtain common mode inductance value according to the Flux saturation degree of common mode inductance coil by the impact of common-mode voltage first-harmonic frequency;
Step 5, obtain common mode capacitance value according to the corner frequency of differential mode noise, common-mode noise and common mode inductance value;
Step 6, respectively equivalent electric circuit is set up to the circulation path of common mode disturbances and differential mode interference, obtain inductance value needed for filter and capacitance according to common mode inductance value and common mode capacitance value, obtain filter topology.
Embodiment two: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode one, the corner frequency f of the differential mode noise described in step 3 and common-mode noise cMfor:
wherein: A cnoiserepresent the amplitude peak of decay, F 0represent the frequency at amplitude place.
Embodiment three: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode one, and 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 U cMpass 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 L cMfor:
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 the impact of Flux saturation degree by common-mode voltage first-harmonic frequency of common mode inductance coil, and other radio-frequency component is ignored.When carrier frequency is certain, if known common-mode voltage value, so, peakflux density B maxvalue just determined by the product SN of S and N, generally, guarantee peakflux density B maxvalue be no more than the saturation flux density B of selected core material sat, the product of SN can select multiple different value.What the present invention selected is the core material of soft magnetic material as common mode inductance coil, and this material has crystal structure, and its saturation flux density reaches as high as B sat=1.2T.The peak I of common mode current cMpeakwith common mode inductance value L cMbetween relation be inversely proportional to, that is: under SN product one stable condition, inductance value L cMbe directly proportional to l, be inversely proportional to N, namely the average length l of inductor core magnetic circuit is shorter, and turn number N is more, the peak I of common mode current cMpeakless.Therefore according to the size of this relation determination common mode inductance value.But the number of turn of inductance coil can not unconfined increase, and coil turn is more, and the iron core of inductance is just corresponding larger, and this also just increases the average length l of iron circuit.So, the determination for l/N value must consider many-sided factor, obtains optimized value.So the value of l/N should be determined by the rated current of common mode inductance, and the diameter of the copper winding namely adopted by inductance coil decides, so the present invention selects soft magnetic material to be the core material of common mode inductance coil, and its saturation flux density maximum is B sat=1.2T, gets the B of inductance when frequency is 40Hz maxfor 0.8T, be B sat2/3.
Embodiment four: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode one, obtains common mode capacitance value C described in step 5 cMfor:
f CM = 1 2 π L CM C CM .
Embodiment five: present embodiment is described below in conjunction with Fig. 1-Fig. 3, present embodiment is described further execution mode one, and the filter topology described in step 6 is: the first filter 7 comprises three common mode inductance L cM1, resistance R p1, R p2, R p3, inductance L dM1, L dM2, L dM3, electric capacity C cM1, resistance R cM1with electric capacity C 1, C 2, C 3; Second filter 8 comprises three common mode inductance L cM2, Y meets electric capacity C cM2, C cM3, C cM4with resistance R cM2;
The passive restraining device of pwm power converter Conducted Electromagnetic Interference also comprises AC power 1, rectifier 2, two dc-link capacitances 3, inverter 4, long cable 5, motor 6, first filter 7 and the second filter 8; The alternating current output of AC power 1 connects the alternating current input of rectifier 2, the rectification output end of rectifier 2 connects one end of two dc-link capacitances 3 respectively, the other end of two dc-link capacitances 3 connects the direct current input of inverter 4, and the inversion alternating current output of inverter 4 exports motor 6 to by long cable 5;
Three common mode inductance L in first filter 7 cM1same Name of Ends U, V, W connect the inversion alternating current output of inverter 4, three common mode inductance L cM1different name end respectively contact resistance R p1, R p2, R p3one end, resistance R p1, R p2, R p3the other end connect inductance L respectively dM1, L dM2, L dM3one end, inductance L dM1, L dM2, L dM3other end U 1, V 1, W 1be connected with motor 6 respectively by long cable 5, inductance L dM1, L dM2, L dM3the other end connect electric capacity C simultaneously 1, C 2, C 3one end, electric capacity C 1, C 2, C 3other end contact resistance R cM1one end, resistance R cM1the other end connect electric capacity C cM1one end, electric capacity C cM1other end O ' be connected to DC bus clamper mid point;
Three common mode inductance L in second filter 8 cM2same Name of Ends A, B, C connect the alternating current input of rectifier 2, three common mode inductance L cM2different name end A 1, B 1, C 1connect the alternating current output of AC power 1, common mode inductance L cM2different name end connect Y simultaneously and meet electric capacity C cM2, C cM3, C cM4one end, Y meets electric capacity C cM2, C cM3, C cM4other end contact resistance R cM2one end, resistance R cM2other end M ' be connected between the neutral point of motor 6.
Embodiment six: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode five, electric capacity C in the first filter 7 cM1for 470nF, common mode inductance L cM1for 25mH, resistance R cM1value according to resistance R p1=R p2=R p3=R pcharacteristic impedance determine, as resistance R p1=R p2=R p3=R pwhen being 210 Ω, resistance R cM1be 20 Ω, inductance L dM1=L dM2=L dM3=L dMfor 2.1mH, electric capacity C 1=C 2=C 3be 3.7 μ F.
Embodiment seven: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode five, common mode inductance L in the second filter 8 cM2be 300 μ H, electric capacity Y meets electric capacity C cM2=C cM3=C cM4for 47nF, resistance R cM2be 100 Ω.
Composition graphs 4 and Fig. 5 analyze the propagation path of electromagnetic interference in pwm power converter, contrast does not adopt filter topologies of the present invention and adopts the circulation path disturbed during filter topologies of the present invention, and in checking the present invention, designed passive filter topological structure and the mode of connection thereof are to the effect of AF panel.
In pwm power converter, will carry out installation of heat radiator to it, object is in order to when switching tube normally works, and ensures that it can not lose efficacy because of overheated.When installation of heat radiator, generally all can add heat conductive insulating medium in the metal shell of its metallic power converter and radiator, will isolate with preventing short circuit both it; On the other hand, radiator passes through chassis earth.So, just inevitably define a larger parasitic capacitance between power inverter and radiator, just constituted a propagation path of power inverter Conducted Electromagnetic Interference by this parasitic capacitance.In PWM drive motors system, rectifier bridge in power inverter and inverter all and between radiator also exist common mode current, 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 drive motors system, the propagation path of Conducted Electromagnetic Interference also comprises induction machine.The stator winding of motor is same with between motor case also exists larger parasitic capacitance, and motor case is also connected with the earth as radiator, and this is just for Conducted Electromagnetic Interference provides path.So, when power inverter switching device turns on and off at a high speed, cause the voltage in the short time, current transients, form the common-mode voltage of high frequency, this high frequency common mode voltage will carry out charging and discharging to the parasitic capacitance between motor stator winding and casing, just defines the Conducted Electromagnetic Interference propagation path of motor side.In addition, when practical engineering application, be generally connected between power inverter and motor with long cable, this time, the distributed capacitance between long cable and ground is also the circulation path of common mode current.
In addition, in pwm power transformation system, the circulation path of Conducted Electromagnetic Interference common mode current also comprises: system transformer neutral point, power inverter connect the distributed capacitance over the ground of the cable of grid side.Wherein, system transformer neutral point is the main circulation path of common mode current, and the common mode current amplitude that different cable types of attachment produces is also different.If during ground connection transformer neutral point is direct by cable, relatively large common mode current will be produced; If time transformer neutral point is indirect earthed by resistance, smaller common mode current will be produced.In addition, the common mode current that Conducted Electromagnetic Interference is formed by the distributed capacitance between power inverter connection grid side cable and ground, its size is relevant with the size of distributed capacitance.
Therefore, in pwm power transformation system, the route of transmission of Conducted Electromagnetic Interference common mode current see Fig. 4, can comprise 3 propagation paths:
Propagation path circulation path is 1.: through inverter, cable, motor parasitic capacitance, motor ground wire, system ground wire, main power source, rectifier bridge, finally return inverter.
Propagation path circulation path is 2.: through inverter, cable, motor parasitic capacitance, motor ground wire, radiator ground wire, fin, inverter parasitic capacitance, finally return inverter.
Propagation path circulation path is 3.: through inverter, rectifier bridge parasitic capacitance, radiator, radiator ground wire, system ground wire, main power source, rectifier, finally return inverter.
Wherein, the Cp1 of the parasitic capacitance in power inverter between rectifier bridge and radiator represents, the common-mode voltage of rectifier bridge side UCMrec represents, parasitic capacitance Cp in power inverter between inverter and radiator represents, the common-mode voltage of inverter side represents with UCMinv.
In pwm power transformation system, insert two filter topologies Fig. 2 and Fig. 3 proposed by the invention, re-establish the common mode equivalent circuit of system, shown in Figure 5.Fig. 4 analysis do not add filter involved in the present invention time system conductive electromagnetic interference propagation path basis on, analyze the common mode electromagnetic interference route of transmission after inserting filter, the path namely in Fig. 5 4., path 5. with path 6.:
Propagation path circulation path is 4.: through inverter, common mode inductance (LCM1), differential mode inductance (LDM1/3), electric capacity (3C1), DC bus, return inverter.
Propagation path circulation path is 5.: 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 is 6.: through inverter, common mode inductance (LCM1), differential mode inductance LDM1/3, long cable, motor center line, (RCM2 and 3CCM2), common mode inductance (LCM2), return inverter.
Clearly can find out, in Figure 5, the object adding common mode inductance LCM1 is the common mode current in order to suppress power inverter outlet side, and object common mode inductance LCM2 being inserted in rectifier bridge AC is the common mode current in order to suppress power inverter input side i.e. rectifier bridge AC.
By to the route of transmission description 4., 5. and 6. adding common mode disturbances after filter proposed by the invention, two filters proposed by the invention can be found out clearly in pwm power changer system to the inhibition of common-mode voltage.
Set up the passive restraining device of pwm power converter Conducted Electromagnetic Interference that three phase rectifier-inversion-electric system verifies that the present invention proposes below to the inhibition of the Conducted Electromagnetic Interference produced in pwm power transformation system.
Verification condition is: rectifier bridge model is MDS30A/1600V; IPM model is PS21867 (30A/600V); Inverter switching frequency is decided to be 10kHz, and modulation ratio is 0.8; Induction machine selected by motor, and its model is J02-32-2, and rated voltage is 380V, and rated frequency is 50Hz, and rated power is 4kW, and rated speed is 2882 revs/min.
The resonance frequency of the common mode disturbances that need decay is 1.5kHz, and the resonance frequency of the differential mode interference that need decay is 1.8kHz.Adding the first filter 7 setting parameter in the present invention during checking is: electric capacity C cM1for 470nF, common mode inductance L cM1for 25mH, resistance R cM1value according to resistance R p1=R p2=R p3=R pcharacteristic impedance determine, as resistance R p1=R p2=R p3=R pwhen being 210 Ω, resistance R cM1be 20 Ω, inductance L dM1=L dM2=L dM3=L dMfor 2.1mH, electric capacity C 1=C 2=C 3be 3.7 μ F.Second filter 8 setting parameter is: common mode inductance L in the second filter 8 cM2be 300 μ H, electric capacity Y meets electric capacity C cM2=C cM3=C cM4for 47nF, resistance R cM2be 100 Ω.
Do not use the pwm power converter Conducted Electromagnetic Interference frequency spectrum of restraining device of the present invention as shown in figure 11, can find out from Figure 11, the Conducted Electromagnetic Interference (150Hz ~ 30MHz) in Conducted Electromagnetic Interference band limits that system produces is all below standard.
After the passive restraining device of access pwm power converter Conducted Electromagnetic Interference of the present invention, the Conducted Electromagnetic Interference frequency spectrum that measurement obtains as shown in figure 12, contrast Figure 12 can find out, the Conducted Electromagnetic Interference of now system generation is all within the scope of the Emission Limits of standard EN 55011 regulation, it can also be seen that from Figure 12, at low more than the 10dB of limit value that the interference transmitted value disturbing the frequency of most strength to produce also specifies than standard, inhibition is obvious, shows the validity of the passive filter that the present invention proposes.

Claims (7)

  1. The passive suppressing method of 1.PWM power inverter Conducted Electromagnetic Interference, is characterized in that, this suppressing method is that employing two filter topology are connected in pwm power converter, and filter topology design process is:
    Step one, utilize the conducted interference of receiver to pwm power converter to measure, obtain electromagnetic interference frequency spectrum, described electromagnetic interference frequency spectrum comprises common mode disturbances frequency spectrum and differential mode interference frequency spectrum;
    Step 2, common mode disturbances frequency spectrum and differential mode interference frequency spectrum to be subtracted each other with the conducted interference Emission Limits curve of pwm power converter respectively, obtain common mode frequency spectrum and the differential mode frequency spectrum of filter attenuation;
    Step 3, according to the amplitude peak of decay and the frequency acquisition differential mode noise at amplitude place and the corner frequency of common-mode noise;
    Step 4, obtain common mode inductance value according to common mode inductance coil flux degree of saturation by the impact of common-mode voltage first-harmonic frequency;
    Step 5, obtain common mode capacitance value according to the corner frequency of differential mode noise, common-mode noise and common mode inductance value;
    Step 6, respectively equivalent electric circuit is set up to the circulation path of common mode disturbances and differential mode interference, obtain inductance value needed for filter and capacitance according to common mode inductance value and common mode capacitance value, obtain filter topology.
  2. 2. the passive suppressing method of pwm power converter Conducted Electromagnetic Interference according to claim 1, is characterized in that, the corner frequency f of the differential mode noise described in step 3 and common-mode noise cMfor:
    wherein: A cnoiserepresent the amplitude peak of decay, F 0represent the frequency at amplitude place.
  3. 3. the passive suppressing method of pwm power converter Conducted Electromagnetic Interference according to claim 1, it is characterized in that, 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 U cMpass 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 L cMfor:
    wherein: l represents the average length of inductance coil iron circuit, μ represents inductance coil iron core magnetic conductance.
  4. 4. the passive suppressing method of pwm power converter Conducted Electromagnetic Interference according to claim 3, is characterized in that, obtain common mode capacitance value C described in step 5 cMfor:
    f CM = 1 2 π L CM C CM .
  5. 5. the passive suppressing method of pwm power converter Conducted Electromagnetic Interference according to claim 1, it is characterized in that, the filter topology described in step 6 is:
    First filter (7) comprises three common mode inductance L cM1, resistance R p1, R p2, R p3, inductance L dM1, L dM2, L dM3, electric capacity C cM1, resistance R cM1with electric capacity C 1, C 2, C 3; Second filter (8) comprises three common mode inductance L cM2, Y meets electric capacity C cM2, C cM3, C cM4with resistance R cM2;
    The passive restraining device of pwm power converter Conducted Electromagnetic Interference also comprises AC power (1), rectifier (2), two dc-link capacitances (3), inverter (4), long cable (5), motor (6), the first filter (7) and the second filters (8); The alternating current output of AC power (1) connects the alternating current input of rectifier (2), the rectification output end of rectifier (2) connects one end of two dc-link capacitances (3) respectively, the other end of two dc-link capacitances (3) connects the direct current input of inverter (4), and the inversion alternating current output of inverter (4) exports motor (6) to by long cable (5);
    Three common mode inductance L in first filter (7) cM1same Name of Ends U, V, W connect inverter (4) inversion alternating current output, three common mode inductance L cM1different name end respectively contact resistance R p1, R p2, R p3one end, resistance R p1, R p2, R p3the other end connect inductance L respectively dM1, L dM2, L dM3one end, inductance L dM1, L dM2, L dM3other end U 1, V 1, W 1be connected with motor (6) respectively by long cable (5), inductance L dM1, L dM2, L dM3the other end connect electric capacity C simultaneously 1, C 2, C 3one end, electric capacity C 1, C 2, C 3other end contact resistance R cM1one end, resistance R cM1the other end connect electric capacity C cM1one end, electric capacity C cM1other end O ' be connected to DC bus clamper mid point;
    Three common mode inductance L in second filter (8) cM2same Name of Ends A, B, C connect rectifier (2) alternating current input, three common mode inductance L cM2different name end A 1, B 1, C 1connect the alternating current output of AC power (1), common mode inductance L cM2different name end connect Y simultaneously and meet electric capacity C cM2, C cM3, C cM4one end, Y meets electric capacity C cM2, C cM3, C cM4other end contact resistance R cM2one end, resistance R cM2other end M ' be connected between the neutral point of motor (6).
  6. 6. the passive suppressing method of pwm power converter Conducted Electromagnetic Interference according to claim 5, is characterized in that, electric capacity C in the first filter (7) cM1for 470nF, common mode inductance L cM1for 25mH, resistance R cM1value according to resistance R p1=R p2=R p3=R pcharacteristic impedance determine, as resistance R p1=R p2=R p3=R pwhen being 210 Ω, resistance R cM1be 20 Ω, inductance L dM1=L dM2=L dM3=L dMfor 2.1mH, electric capacity C 1=C 2=C 3be 3.7 μ F.
  7. 7. the passive suppressing method of pwm power converter Conducted Electromagnetic Interference according to claim 5, is characterized in that, common mode inductance L in the second filter (8) cM2be 300 μ H, electric capacity Y meets electric capacity C cM2=C cM3=C cM4for 47nF, resistance R cM2be 100 Ω.
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CN107819423A (en) * 2016-09-13 2018-03-20 福特全球技术公司 Pseudo-random pulse width modulated change based on motor operations point
CN106849808A (en) * 2017-03-31 2017-06-13 哈尔滨工业大学 New method for sensorless control technique of PMSM and method with LC wave filters
CN107819397A (en) * 2017-12-06 2018-03-20 浙江大学 Input filter and its method to set up include the frequency converter of the input filter
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CN113258813A (en) * 2021-06-10 2021-08-13 南京航天国器智能装备有限公司 High-power machine carries power of mooring unmanned aerial vehicle high pressure with EMC harmonic restraines
CN113311278A (en) * 2021-07-01 2021-08-27 哈尔滨理工大学 Six-phase motor driving system fault diagnosis method based on vector space decoupling

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