CN104795986B - Power conversion device with common-mode noise suppression function - Google Patents
Power conversion device with common-mode noise suppression function Download PDFInfo
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- CN104795986B CN104795986B CN201410020818.XA CN201410020818A CN104795986B CN 104795986 B CN104795986 B CN 104795986B CN 201410020818 A CN201410020818 A CN 201410020818A CN 104795986 B CN104795986 B CN 104795986B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 121
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- 238000004804 winding Methods 0.000 claims abstract description 176
- 239000003990 capacitor Substances 0.000 claims abstract description 96
- 238000001914 filtration Methods 0.000 claims abstract description 58
- 230000008878 coupling Effects 0.000 claims description 14
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- 150000001875 compounds Chemical class 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 4
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- 238000004146 energy storage Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
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Classifications
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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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Abstract
The invention provides a power conversion device with a common-mode noise suppression function, at least comprising a grounding terminal, a power conversion unit, a direct-current bus capacitor unit, a filtering capacitor unit, a filtering inductor unit, and a compensation line. According to the invention, three groups of main winding inductors and three groups of auxiliary winding inductors form the filtering inductor unit, so that the power conversion unit can be coupled to three phase terminals of an external electrical device through the three groups of main winding inductors, and the three groups of auxiliary winding inductors can be matched with a compensation unit of a compensation capacitor to form the compensation line. Thus, engineering personnel can select an appropriate turns ratio of the main winding inductance to the auxiliary winding inductance so as to easily suppress common-mode noise at the resonance frequency of the power converter obviously and effectively.
Description
Technical field
The application is related to a kind of three-phase power converters, is espespecially connected to the one of phase three-wire three low-frequency ac power or load
Plant the power conversion unit with suppression common mode noise function.
Background technology
In the systems such as AC-DC, DC-AC, UPS, wind energy and solar energy in three-phase, it usually needs a three phase power conversion
Device.Fig. 1 show the topological structure of basic three-phase power converters, and the three-phase power converters 1 ' mainly include：One power
Converter unit 11 ', a filter inductance group 12 ', a filter capacitor group 13 ' and a source impedance stabilizing network 14 '；Wherein, work(
Rate converter unit 11 ' as three bridge arm midpoints (A ', B ' and C ') at exchange end is respectively coupled to the three of filter inductance group 12 '
Individual filter inductance (LF1’、LF2' and LF3’)；Also, three filter inductance (LF1’、LF2' and LF3') filter is respectively coupled to again
Three filter capacitor Cx ' of ripple capacitance group 13 '；Wherein, three filter capacitor Cx ' are Y-connection, and three filtered electricals
The one end for holding Cx ' is coupled to three phase terminals (Ua ', Ub ' and Uc ') of external electrical network 2 ', and the other end is then connected with each other with structure
Into a neutral point N '.Further, can also be by source impedance stabilizing network (Line Impedance Stabilization
Network, LISN) 14 ' it is coupled between the electrical network 2 ' and the filter capacitor group 13 ', to as the three-phase power converters
1 ' carries out auxiliary equipment when Conducted Electromagnetic Interference is tested.Additionally, as shown in figure 1, the output end of power conversion unit 11 ' be by
DC filter capacitor CB0’、CB1' and CB2' respectively formed three DC terminals O ', wherein P ' and Q ', DC terminal O ' in dc bus
Point O ', is DC filter capacitor CB1' and CB2' shared end.
Among described three-phase power converters 1 ', it is assumed that C0' it is to be connected with DC filter capacitor CB0’、CB1' and CB2’
Dc bus and earth terminal GND ' between distribution capacity, then C1A’、C1B' and C1C' be respectively power conversion unit 11 ' among
Each bridge arm midpoint (A ', B ' and C ') GND ' over the ground distribution capacity.Thus, when power conversion unit 11 ' carries out current potential
During saltus step, distribution capacity C1A’、C1B' and C1C' displacement current can be produced, and this displacement current can further flow into earth terminal
GND ', thus form common mode noise (common mode current).Unceasingly the suppression common mode of the three-phase power converters with reference to shown in Fig. 2 is made an uproar
The solution of sound.The topological structure formula of the three-phase power converters shown in Fig. 2 is by by a coupling of passive common mode filters 15 '
Between the electrical network 2 ' being connected on shown in Fig. 1 and the filter capacitor group 13 ' of three-phase power converters 1 '；Wherein, passive common mode filters
15 ' include multiple common mode inductance LCM' a common mode inductance group 151 ' being constituted and filtered by three of Y-connection each other
Electric capacity CY' formed a filter capacitor group 152 '.
Although the solution shown in Fig. 2 can solve to result from being total among the three-phase power converters 1 ' of Fig. 1 really
Mould noise, but, due to common mode inductance LCM' volume is big, high cost, cause the design of common mode inductance group 151 ' and integrate
It is difficult.As shown in the voltage spectrum figure of Fig. 3, wherein, curve 1 is the voltage spectrum figure of the three-phase power converters 1 ' shown in Fig. 1,
And curve 2 is the voltage spectrum figure of the three-phase power converters shown in Fig. 2.By the voltage spectrum figure of Fig. 3, even if it can be found that will
Between electrical network 2 ' that passive common mode filters 15 ' are coupled to and the filter capacitor group 13 ' of three-phase power converters 1 ', become in power
Resonant frequency f of parallel operation0Place, however it remains very big noise, shows that passive common mode filters 15 ' become for the three phase power
The noise rejection effect of parallel operation 1 ' is not good.
Summary can be learnt for the understanding of the common mode noise solution of existing various three-phase power converters
Existing various common mode noise solutions all have the shortcomings that a little and not enough；In view of this, the inventor of this case strongly adds
To study invention, and research and develop finally and complete the present invention.
The content of the invention
In order to overcome defect of the prior art, present invention is primarily targeted at providing a kind of with suppression common mode noise
The power conversion unit of function, it is mainly constituted a filter inductance list with three groups of main winding inductance and three groups of assists winding inductance
Unit so that the major power converter unit inside the power conversion unit can be coupled to outer by three groups of main winding inductance
Three phase terminals of the electric device in portion；Meanwhile, one of such as compensating electric capacity is more coordinated using three groups of assists winding inductance
Compensating unit is constituting one group of compensated line so that engineering staff can pass through to select appropriate main winding inductance and assists winding electricity
The turn ratio of sense, and easily for the common mode noise at the resonant frequency of power inverter, play the suppression effect of significant effective
Really.
Therefore, in order to reach the purpose of the present invention, present inventor proposes a kind of with suppression common mode noise work(
The power conversion unit of energy, it includes：
One earth terminal；
One power conversion unit, with one first DC terminal, one second DC terminal, one first ac terminal, one
Two ac terminals and one the 3rd ac terminal；Wherein, first DC terminal is coupled to outside with second DC terminal
One first electric device；
One dc-link capacitance unit, is coupled between first DC terminal and second DC terminal；
One filter capacitor unit, including one first filter capacitor, one second filter capacitor and one the 3rd filter capacitor, its
In, first filter capacitor, second filter capacitor are to be respectively coupled to the respective one end of the 3rd filter capacitor
One first phase terminal of one second outside electric device, one second phase terminal and a third phase terminal, first filtered electrical
Hold, second filter capacitor and the respective other end of the 3rd filter capacitor are to be connected to each other to a common port；And
One filter inductance unit, including：One first main winding inductance, with one first main winding low frequency end and one first master
Winding front end, wherein, the first main winding low frequency end is coupled to first phase terminal and the 3rd filter capacitor,
The first main winding front end is then coupled to first ac terminal；One first assists winding inductance, with this first master around
Group inductive, and with one first assists winding low frequency end and one first assists winding front end, wherein, first auxiliary
Winding low frequency end is coupled to the common port；One second main winding inductance, with one second main winding low frequency end and one second master
Winding front end, wherein, the second main winding low frequency end is coupled to second phase terminal and second filter capacitor, described
Second main winding front end is then coupled to second ac terminal；One second assists winding inductance, with the second main winding inductance
Coupling, with one second assists winding low frequency end and one second assists winding front end, wherein, the second assists winding low frequency
End is coupled to the first assists winding front end；One the 3rd main winding inductance, with one the 3rd main winding low frequency end and
3rd main winding front end, wherein, the second main winding low frequency end is coupled to the third phase terminal first filter capacitor, institute
State the 3rd main winding front end and be then coupled to the 3rd ac terminal；And one the 3rd assists winding inductance, with the described 3rd master
Winding inductance is coupled, and with one the 3rd assists winding low frequency end and one the 3rd assists winding front end, wherein, the described 3rd is auxiliary
Winding low frequency end is helped to be coupled to the second assists winding front end, and the 3rd assists winding front end is coupled to this
Earth terminal.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, further includes one
Compensating unit, one end of the compensating unit is coupled in the 3rd assists winding front end, and the other end is then coupled in the earth terminal.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, the compensation
Unit is any one for being selected from following group：Compensating electric capacity, compensation inductance, compensation resistance, above-mentioned both tandem compound,
The tandem compound of above-mentioned three.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, the compensation
Unit is composed in series by a compensation inductance with a compensating electric capacity, and the sensibility reciprocal Lcomp of the compensation inductance meets following calculating
Formula：Lcomp ＜ 2 (M-3L ')；Wherein, M be three main winding inductance inside the filter inductance unit and three auxiliary around
The mutual induction amount of group inductance, and L ' is the inductance value of three assists winding inductance inside the filter inductance unit.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described benefit
The sensibility reciprocal Lcomp for repaying inductance meets following computing formula：Lcomp=M-3L’。
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described first
The turn ratio of main winding inductance and the first assists winding inductance, the second main winding inductance and second assists winding
The turn ratio of the turn ratio of inductance and the 3rd main winding inductance and the 3rd assists winding inductance, is all between 3:
1.3 and 3:Between 0.7.Also, it is preferred that the turn ratio of the first main winding inductance and the first assists winding inductance,
The second main winding inductance and the turn ratio of the second assists winding inductance and the 3rd main winding inductance with it is described
The turn ratio of the 3rd assists winding inductance is all 3:1.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, the power
Converter unit is one or two level power converter, three level power converter or other multi-level power converters.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described first
DC terminal is coupled to one first electric device with second DC terminal, wherein, first electric device be electric capacity,
AC-to DC rectification unit, direct current are to AC rectification unit and battery.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described tool
The power conversion unit for having suppression common mode noise function also includes one second power conversion unit, is coupled in first direct current
Between terminal and second DC terminal.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described second
Power conversion unit is the rectification unit of an AC-to DC or a direct current to ac converter unit.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described first
Phase terminal, second phase terminal and the third phase terminal are coupled to one second electric device, wherein, described second is electric
Device is electrical network or motor.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described tool
The power conversion unit for having suppression common mode noise function further includes an EMI FILTER, and described EMI FILTER
It is coupled between the filter capacitor unit and first phase terminal, second phase terminal and the third phase terminal.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described electricity
Magnetic disturbance wave filter is one group of differential mode filter, and it includes：One first EMI Filtering inductance, its one end be coupled to this
One phase terminal, and its other end is coupled in first filter capacitor；One second EMI Filtering inductance, its one end is coupled to
It is coupled in second filter capacitor in second phase terminal, and its other end；One the 3rd EMI Filtering inductance, its one end
It is coupled in the third phase terminal, and its other end is coupled in the 3rd filter capacitor；One first EMI Filtering electric capacity,
Its one end is coupled in the first EMI Filtering inductance, and its other end is coupled in the second EMI Filtering electricity
Sense；One second EMI Filtering electric capacity, its one end is coupled in the second EMI Filtering inductance, and its other end is coupling
It is connected on the 3rd EMI Filtering inductance；And one the 3rd EMI Filtering electric capacity, its one end is coupled to first electric at this
Magnetic disturbance filter inductance, and its other end is coupled in the 3rd EMI Filtering inductance.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, described electricity
Magnetic disturbance wave filter is one group of common-mode filter, and it includes：One first EMI Filtering inductance, its one end be coupled to this
One phase terminal, and its other end is coupled in first filter capacitor；One second EMI Filtering inductance, its one end is coupled to
It is coupled in second filter capacitor in second phase terminal, and its other end；One the 3rd EMI Filtering inductance, its one end
It is coupled in the third phase terminal, and its other end is coupled in the 3rd filter capacitor；One first EMI Filtering electric capacity,
Its one end is coupled in the 3rd EMI Filtering inductance, and its other end is coupled in the earth terminal；One second electromagnetism is done
Filter capacitor is disturbed, its one end is coupled in the second EMI Filtering inductance, and its other end is coupled in the earth terminal；With
And one the 3rd EMI Filtering electric capacity, its one end is coupled in the first EMI Filtering inductance, and its other end is coupling
It is connected on the earth terminal.
One specific embodiment of the power conversion unit with suppression common mode noise function of the invention, the power
Converting means is a phase three-wire three power conversion unit.
Compared to prior art, the technology of the present invention has advantages below：
1. the power conversion unit with suppression common mode noise function proposed by the invention, its main technical characteristic exists
In filter inductance unit and the Topology Structure Design of compensated line；Wherein, with three groups of main winding inductance and three groups of assists winding electricity
Sense constitutes the filter inductance unit so that power conversion unit can be coupled to the electricity of outside by three groups of main winding inductance
Three phase terminals of device of air；Meanwhile, the compensating unit of such as compensating electric capacity is more coordinated using three groups of assists winding inductance with
Constitute compensated line so that engineering staff can pass through the turn ratio of the appropriate main winding inductance of selection and assists winding inductance, and
For the common mode noise at the resonant frequency of power inverter, obvious, effective inhibition is played.
2. above-mentioned 1st point is held, also, because three groups of assists winding inductance are mainly to by common mode current (common mode noise)
Earth terminal is directed to, therefore three groups of assists winding inductance can be laid out with thinner line, such mode can also be effective
Save the volume and manufacturing cost of common-mode filter.
Description of the drawings
Configurations and embodiments are described in detail referring to following accompanying drawing, wherein referring to identical group with identical reference
Part.
Fig. 1 is the topology diagram of basic three-phase power converters；
Fig. 2 is the solution figure of the suppression common mode noise of basic three-phase power converters；
Fig. 3 is voltage spectrum figure；
Fig. 4 is a kind of the first topological structure of power conversion unit with suppression common mode noise function of the present invention
Figure；
Fig. 5 is second topology diagram of the power conversion unit with suppression common mode noise function of the present invention；
Fig. 6 is the topology diagram of power conversion unit；
Fig. 7 is the equivalent common mode noise illustraton of model of the topological structure shown in Fig. 5；
Fig. 8 is the third topology diagram of power conversion unit of the present invention with suppression common mode noise function；
Fig. 9 is the equivalent common mode noise illustraton of model of the topological structure shown in Fig. 8；
Figure 10 a are a voltage spectrum figure；
Figure 10 b are another voltage spectrum figure；
Figure 11 is the 4th kind of topology diagram of power conversion unit of the present invention with suppression common mode noise function；
Figure 12 is a kind of topology diagram of EMI FILTER；
Figure 13 is the topology diagram of another kind of EMI FILTER；
Figure 14 be this have suppression common mode noise function power conversion unit a kind of applied topology structure chart；
Figure 15 be this have suppression common mode noise function power conversion unit another kind of applied topology structure chart；
Figure 16 be this have suppression common mode noise function power conversion unit another applied topology structure chart；
Figure 17 be this have suppression common mode noise function power conversion unit another applied topology structure chart.
Wherein, description of reference numerals is as follows：
1 '-three-phase power converters；
11 '-power conversion unit；12 '-filter inductance group；
14 '-source impedance stabilizing network 13 '-filter capacitor group；
A '-bridge arm midpoint B '-bridge arm midpoint；
C '-bridge arm midpoint LF1'-filter inductance；
LF2'-filter inductance； LF3'-filter inductance；
Cx '-filter capacitor 2 '-electrical network；
The phase terminals of Ua '-the first；Uc '-third phase terminal；
N '-neutral point；The phase terminals of Ub '-the second；
CB0'-DC filter capacitor； CB1'-DC filter capacitor；
CB2'-DC filter capacitor；O '-DC terminal；
P '-DC terminal；Q '-DC terminal；
C1A'-distribution capacity；GND '-earth terminal；
C1B'-distribution capacity； C1C'-distribution capacity；
15 '-passive common mode filters；LCM '-common mode inductance；
151 '-common mode inductance group；152 '-filter capacitor group；
CY'-filter capacitor； C0'-distribution capacity；
1- has the power conversion unit of suppression common mode noise function；
11- power conversion units；12- filter capacitor units；
14- compensated lines；13- filter inductance units；
The DC terminals of P- first；The DC terminals of Q- second；
The ac terminals of A- first；The ac terminals of B- second；
The ac terminals of C- the 3rd；CB0- dc-link capacitance units；
The bus capacitors of CB1- first；The bus capacitors of CB2- second；
O- dc bus midpoint；The filter capacitors of Cx1- first；
The filter capacitors of Cx2- second；The filter capacitors of CX3- the 3rd；
2- electric devices；The phase terminals of Ua- first；
The phase terminals of Ub- second；Uc- third phase terminals；
N- common port 15- source impedance stabilizing networks；
LA- the first main winding inductance；The assists winding inductance of LA '-the first；
LB- the second main winding inductance；The assists winding inductance of LB '-the second；
The main winding inductance of LC- the 3rd；The assists winding inductance of LC '-the three；
The ac terminals of A- first；141- compensating units；
GND- earth terminals；Ccomp- compensating electric capacities；
Lcomp- compensates inductance；
ZLISNThe equiva lent impedance of-source impedance stabilizing network；
M- mutual induction amounts；L- inductance values；
L '-total inductance； uAO- voltage；
uBO- voltage； uCO- voltage；
Ucomp-offset voltage；Ccm-equivalent common mode capacitance；
C1a- distribution capacity；C1b- distribution capacity；
C1c- distribution capacity；Co- distribution capacity；
17- EMI FILTERs；LDM1- the first differential mode filter inductances；
LDM2- the second differential mode filter inductances；The differential mode filter inductances of LDM3- the 3rd；
Cxx1- the first differential mode filter capacitors；Cxx2- the second differential mode filter capacitors；
The differential mode filter capacitors of Cxx3- the 3rd；LCM1- the first common mode filtering inductance；
LCM2- the second common mode filtering inductance；The common mode filtering inductance of LCM3- the 3rd；
CY1- the first common mode filtering electric capacity；CY2- the second common mode filtering electric capacity；
The common mode filtering electric capacity of CY3- the 3rd；The power conversion units of 11a- second；
2a- electrical networks；2b- motors；
2d- batteries；2c- nonlinear loads.
Specific embodiment
A kind of power conversion unit with suppression common mode noise function of the present invention is specifically described below with reference to accompanying drawing
Multiple embodiments.As clearly stated, the details of multiple embodiments will be explained in the following description.However, should
Recognize, the details of these embodiments should not be used to limit the application.
Please also refer to Fig. 4 and Fig. 5, a kind of dress of the power conversion with suppression common mode noise function respectively of the invention
The first put and second topological structure.As shown in figure 4, the dress of the power conversion with suppression common mode noise function of the present invention
Putting the topological structure of 1 (hereinafter referred to as power conversion unit 1) mainly includes：One earth terminal GND, a power conversion unit 11,
Dc-link capacitance unit CB0, a filter capacitor unit 12, a filter inductance unit 13 and a compensated line 14.Such as Fig. 5
Shown power conversion unit 11 is a two level three-phase power converters, and with one first DC terminal P, one second direct current
Terminal Q, one first ac terminal A, one second ac terminal B and one the 3rd ac terminal C；Wherein, due to the first DC terminal
P and the second DC terminal Q are not already connected to the electric device of outside, therefore are coupled in this with a dc-link capacitance unit CB0
Between first DC terminal P and second DC terminal Q.In this, it is necessary to special instruction, in any possible engineer applied
Among, power conversion unit 11 can be coupled to by its first DC terminal P and the second DC terminal Q an electric capacity, one
Direct current is to exchange (DC-AC) rectification unit or a battery.
Fig. 5 is referred to once again, and with reference to the topological structure of the power conversion unit 11 shown in Fig. 6, power conversion unit
11 is one or three level power converter units.Among actual application, power conversion unit 11 can also be level three more than
Phase power conversion unit or other multi-level power converters；Wherein, to be divided into one first female for dc-link capacitance unit CB0
Line capacitance CB1 and one second bus capacitor CB2.As illustrated, the first bus capacitor CB1 is coupled in first DC terminal P
Between the O of dc bus midpoint, the second bus capacitor CB2 be then coupled in the second DC terminal Q and dc bus midpoint O it
Between.
The power conversion unit 1 of the present invention is unceasingly illustrated, wherein, filter capacitor unit 12 includes one first filter capacitor
Cx1, one second filter capacitor Cx2 and one the 3rd filter capacitor Cx3.As shown in figure 5, first filter capacitor Cx1, second filter
One end of ripple electric capacity Cx2 and the 3rd filter capacitor Cx3 is coupled to an electric device 2 of outside；Special instruction, this is electric
Device 2 is an electric device 2 for having three-phase terminal, such as electrical network, motor and nonlinear load；Therefore, first filter capacitor
Cx1, the second filter capacitor Cx2 and the respective one end of the 3rd filter capacitor Cx3 are be respectively coupled to the electric device 2 one
First phase terminal Ua, one second phase terminal Ub and a third phase terminal Uc；Also, the first filter capacitor Cx1, the second filter capacitor
Cx2 and the respective other ends of the 3rd filter capacitor Cx3 are to be connected to each other to a common port N.Additionally, source impedance stabilizing network
(Line Impedance Stabilization Network, LISN) 15 is coupled in the electric device 2 and the filter capacitor
Between unit 12, when carrying out Conducted Electromagnetic Interference test to the power conversion unit as this with suppression common mode noise function
Auxiliary equipment.
As shown in figure 5, filter inductance unit 13 includes：One first main winding inductance LA, one first assists winding inductance
LA ', one second main winding inductance LB, one second assists winding inductance LB ', the auxiliary of one the 3rd main winding inductance LC and the 3rd
Winding inductance LC '；Wherein, the first main winding inductance LA has a low frequency of the first phase terminal Ua for being coupled to the electric device 2
End, and the front end for being coupled to the first ac terminal A of the power conversion unit 11.Corresponding to the first main winding inductance
LA, the first assists winding inductance LA ' also have a low frequency end and a front end, and the low frequency end of main winding each other Same Name of Ends is determined
Justice for assists winding low-frequency range, and the definition of the front end of main winding Same Name of Ends each other is the high band of assists winding, is such as schemed
Shown, the one end with point is the Same Name of Ends for aiding in winding inductance and main winding inductance, that is to say, that the first assists winding inductance LA '
Band point end is its low frequency end, and the other end is then front end, and the first described assists winding low frequency end is coupled to the common port
N.Also, the second main winding inductance LB has a low frequency end of the second phase terminal Ub for being coupled to electric device 2, and coupling
It is connected to a front end of the second ac terminal B of the power conversion unit 11；Likewise, the second assists winding inductance LB ' also has
There are a low frequency end and a front end, as illustrated, the one end with point is the Same Name of Ends for aiding in winding inductance and main winding inductance, because
This second assists winding inductance LB ' bands point end is its low frequency end, and the other end is then front end.Furthermore, the 3rd main winding inductance LC
Equally there is a low frequency end and a front end, wherein, the low frequency end of the 3rd main winding inductance LC is coupled to the of electric device 2
Three-phase terminal Uc, its front end is then coupled to the 3rd ac terminal C.3rd assists winding inductance LC ' also has a low frequency end
With a front end, as illustrated, the one end with point is the Same Name of Ends for aiding in winding inductance and main winding inductance, therefore the 3rd aids in
Winding inductance LC ' bands point end is its low frequency end, and the other end is then front end.
In the present invention, compensated line 14 is mainly by first assists winding inductance LA ', the second assists winding inductance
LB ', the 3rd assists winding inductance LC ' and a concatenation of compensating unit 141 are formed；Wherein, three assists windings are according to low
The principle head and the tail compensation branch road in series that frequency end is connected with front end；One end of the series arm of composition is compensation branch road
Front end, the other end is then the low frequency end of compensation branch road.As shown in figure 5, the low frequency end of compensation branch road is connected to filter capacitor list
The common port N of unit 12, the front end for compensating branch road is coupled to earth terminal GND.The present invention is not particularly limited compensating unit 141
Form, therefore, compensating unit 141 can be compensating electric capacity Ccomp, a compensation inductance Lcomp, a compensation resistance, above-mentioned
Appoint both tandem compound or above-mentioned three tandem compound.Fig. 5 and Fig. 7, Fig. 7 be please also refer to for the topology shown in Fig. 5
The equivalent common mode noise model of structure.As shown in figure 5, compensating unit 141 is by a compensation inductance Lcomp and a compensating electric capacity
Ccomp concatenations are formed；Therefore, the topological structure of Fig. 5 can be simplified as the equivalent common mode noise model of Fig. 7.In the equivalent of Fig. 7
Among common mode noise model, ZLISNThe equivalent resistance (impedance) of the source impedance stabilizing network 15 shown in Fig. 5, N are public for this
It is the filtering that end, M are three main winding inductance and the mutual induction amount of three assists winding inductance inside filter inductance unit 13, L
Three main winding inductance values and L ' inside inductance unit 13 are three assists winding inductance inside the filter inductance unit 13
Amount.
Unceasingly with reference to Fig. 5 and Fig. 7.In Figure 5, uAO、uBOAnd uCOBe expressed as the first ac terminal A, second
Voltage between ac terminal B and the 3rd ac terminal C and dc bus midpoint O.Ucomp is expressed as by filter inductance unit 13
The offset voltage that formed of three assists winding inductance (LA1 ', LA2 ' and LA3 ')；Also, C1a, C1b and the C1c in Fig. 5
Respectively three ac terminals (A, B and C) distribution capacity over the ground, Co is then respectively dc bus midpoint O distribution electricity over the ground
Hold.In the topological structure of Fig. 5, leaping voltage (uAO、uBOAnd uCO) can generate on those distribution capacity (C1a, C1b and C1c)
Displacement current, displacement current flows into ground and forms common mode current（That is, common-mode noise）.Separately, corresponding to Fig. 5, the Ccm of Fig. 7 for etc.
Effect common mode capacitance, is for the total capacitance of four distribution capacity (C1a, C1b, C1c and C0).
As described above, according to the equivalent model of Fig. 7, it is found that if the sensibility reciprocal Lcomp=M- of the compensation inductance
3L ', then can cause 3L '-M+Lcomp=0；Consequently, it is possible to compensated line 14 can be equivalent to compensating electric capacity Ccomp,
So that compensating electric capacity Ccomp is used as a Y capacitance (that is, CY), at the same mutual inductance M can by etc. school be a common mode inductance
(that is, LCM) is used, and Y capacitance just constitutes an equivalent common-mode filter with common mode inductance.In actual application, only
Lcomp ＜ 2 (M-3L ') are wanted just to play the positive effect of equivalent common-mode filter.
In addition, the third of the power conversion unit with suppression common mode noise function for being illustrated in figure 8 the present invention is opened up
Flutter structure.Topological structure compared to Fig. 5, the topological structure of Fig. 8 is using compensating electric capacity Ccomp as the compensating unit
141.Also, the topological structure of the power conversion unit of Fig. 8 can be equivalent to equivalent common mode noise model as shown in Figure 9.
In the topological structure shown in Fig. 8, turn ratio n of main winding inductance and assists winding inductance among filter inductance unit 13 is
3：1；Thus, then cause filter inductance unit 13 inside three main winding inductance total inductance L=9L ', and so that three masters around
The mutual inductance M=3L ' of group inductance and three assists winding inductance.Due to Lcomp=M-3L ', therefore Lcomp=0 is understood by calculating.
That is, in the topological structure of the power conversion unit 1 of Fig. 8, need not be using compensation inductance.
Above-mentioned explanation is held, due to L/3-M=0, therefore, it is such to be designed to for power as shown in the curve 3 of Fig. 3
Common mode noise at resonant frequency f0 of converter, serves very big inhibition.In this, it is necessary to supplementary notes,
In actual engineer applied, due to the main winding inductance inside filter inductance unit 13 it is impossible with the coupling of assists winding inductance
Reach theoretical value 1；Based on it is such the reasons why, design the present invention the power conversion unit 1 with suppression common mode noise function
When, turn ratio n of main winding inductance and assists winding inductance can be allowed 3:1.3 and 3：Between 0.7, also, preferably
Turn ratio n be 3:1.
Effect of the suppression common mode noise of the power conversion unit 1 shown in Fig. 8, can implement the topological frame with simulation software
Structure, and the magnitude of voltage for measuring its source impedance stabilizing network (LISN) 15 at different frequencies is measured, the result of emulation is as schemed
Shown in 10a；Implement the topological structure of the existing power conversion unit shown in Fig. 1 with simulation software, and measure in different frequencies
The magnitude of voltage of its source impedance stabilizing network (LISN) is measured under rate, the result of measurement is as shown in fig. lob.Comparison diagram 10a and figure
10b, it is apparent that the power conversion unit 1 shown in Fig. 8 is in the upper of frequency range 30kHz, with preferable common mode noise
Inhibition, and also reduce the resonance occurred more than frequency range 260kHz.
Except the topology of the power conversion unit with suppression common mode noise function of the invention shown in Fig. 3, Fig. 5, Fig. 8
Beyond structure, in actual engineer applied, the power conversion unit with suppression common mode noise function of the present invention has more
Other topological structures for expanding.Figure 11 is refer to, is the power conversion unit with suppression common mode noise function of the present invention
4th kind of topological structure；Wherein, the topological structure shown in Figure 11 is by by an EMI FILTER (EMI filter)
17 are coupled between the filter capacitor unit 12 among the power conversion unit 1 shown in Fig. 4 and electric device 2 and complete.Also,
The EMI FILTER 17 can be differential mode filter as shown in figure 12 or common-mode filter as shown in fig. 13 that.
Above-mentioned explanation is held, if using differential mode filter as the EMI FILTER 17, it includes：One first differential mode
Filter inductance LDM1, its one end is coupled to be coupled in first filter capacitor in first phase terminal Ua, and its other end
Cx1；One second differential mode filter inductance LDM2, its one end is coupled to be coupled at this in second phase terminal Ub, and its other end
Second filter capacitor Cx2；One the 3rd differential mode filter inductance LDM3, its one end is coupled in third phase terminal Uc, and its is another
End is coupled in the 3rd filter capacitor Cx3；One first differential mode filter capacitor Cxx1, its one end is coupled in the first differential mode filter
Ripple inductance LDM1, and its other end is coupled in second differential mode filter inductance LDM2；One second differential mode filter capacitor Cxx2, its
One end is coupled to be coupled in the 3rd differential mode filter inductance LDM3 in second differential mode filter inductance LDM2, and its other end；
And one the 3rd differential mode filter capacitor Cxx3, its one end be coupled to be in first differential mode filter inductance LDM1, and its other end
It is coupled in the 3rd differential mode filter inductance LDM3.
If also, using common-mode filter as the EMI FILTER 17, it includes：One first common mode filtering inductance
LCM1, its one end is coupled in first phase terminal Ua, and its other end is coupled in first filter capacitor Cx1；One second
Common mode filtering inductance LCM2, its one end is coupled to be coupled in second filtered electrical in second phase terminal Ub, and its other end
Hold Cx2；One the 3rd common mode filtering inductance LCM3, its one end is coupled to be coupled in third phase terminal Uc, and its other end
3rd filter capacitor Cx3；One first common mode filtering electric capacity CY1, its one end is coupled in the 3rd common mode filtering inductance LCM3,
And its other end is coupled in earth terminal GND；One second common mode filtering electric capacity CY2, its one end is coupled in second common mode
Filter inductance LCM2, and its other end is coupled in earth terminal GND；And one the 3rd common mode filtering electric capacity CY3, its one end is
First common mode filtering inductance LCM1 is coupled in, and its other end is coupled in earth terminal GND.
Thus, via above-mentioned complete explanation, the power conversion unit with suppression common mode noise function of the present invention
The topological structure and its correlation technique feature of various practical applications has all been clearly described.Then, below will go on to say
The application surface of the power conversion unit of the present invention.The topological structure of power conversion unit as shown in figure 14, power conversion unit
11 couple one second power conversion unit 11a, the second power conversion list by its first DC terminal P and the second DC terminal Q
First 11a is coupled to a motor 2b, and three ac terminals (A, B and C) of power conversion unit 1 are coupled to external electrical network 2a, its
In the second power conversion unit 11a can be direct current to exchange (DC-AC) inversion unit or AC-to DC rectification unit, this
Power conversion unit can be applicable to a motor driven systems or wind generator system.Refer again to the power conversion shown in Figure 15
The topological structure of device 1, wherein, power conversion unit 11 couples one the by its first DC terminal P and the second DC terminal Q
Two power conversion unit 11a, the second power conversion unit 11a are coupled to external electrical network 2a, three exchanges of power conversion unit 1
Terminal (A, B and C) is coupled to motor 2b, wherein the second power conversion unit 11a can be inversion list of the direct current to exchange (DC-AC)
Unit or the rectification unit of AC-to DC, this power conversion unit can be applicable to a motor driven systems or wind generator system
Motor side.
Continuing with ground with reference to the power conversion unit 1 shown in Figure 16 topological structure, wherein, the of power conversion unit 11
One direct current terminals P is connected with the electric device outside the second DC terminal Q discord, therefore with a dc-link capacitance unit CB0
It is coupled between the first DC terminal P and second DC terminal Q；Relatively, three exchange ends of power conversion unit 11
Sub (A, B and C) is then coupled to an an electrical network 2a and nonlinear load 2c simultaneously.Finally, refer to the power shown in Figure 17
The topological structure of converting means 1, wherein, the coupling by its first DC terminal P and the second DC terminal Q of power conversion unit 11
It is connected to a battery 2d；Also, three ac terminals (A, B and C) of power conversion unit 11 are then coupled to an electrical network 2a.
Thus, it is above-mentioned completely and clearly demonstrate the present invention the power conversion unit with suppression common mode noise function
All topological structures and its application, also, via above-mentioned, can learn that the present invention has the advantages that following：
1. the power conversion unit with suppression common mode noise function proposed by the invention, main is technically characterized in that
The Topology Structure Design of filter inductance unit 13 and compensated line 14；Wherein, with three groups of main winding inductance and three groups of assists windings
Inductance constitutes the filter inductance unit so that power conversion unit 11 can be coupled to outside by three groups of main winding inductance
Electric device three phase terminals；Meanwhile, the benefit of such as compensating electric capacity Ccomp is more coordinated using three groups of assists winding inductance
Repay unit 141 to constitute compensated line 14 so that engineering staff can pass through to select appropriate main winding inductance and assists winding electricity
The turn ratio of sense, and for the common mode noise at the resonant frequency of power inverter, play obvious, effective inhibition.
2. above-mentioned 1st point is held, also, because three groups of assists winding inductance are mainly to by common mode current (common mode noise)
Earth terminal GND is directed to, therefore three groups of assists winding inductance can be laid out with thinner line, such mode can also have
Effect saves the volume and manufacturing cost of common-mode filter.
It will be apparent to one skilled in the art that can be on the premise of without departing substantially from spirit and scope to this Shen
Please make various changes and change.Therefore, it is intended to cover the various modifications and variations made to the application, as long as they fall
In the protection domain of claims and its equivalent.
Claims (18)
1. a kind of power conversion unit with suppression common mode noise function, it is characterised in that include：
One earth terminal；
One power conversion unit, hands over one first DC terminal, one second DC terminal, one first ac terminal, one second
Stream terminal and one the 3rd ac terminal；
One dc-link capacitance unit, is coupled between first DC terminal and second DC terminal；
One filter capacitor unit, including one first filter capacitor, one second filter capacitor and one the 3rd filter capacitor, wherein, institute
It is to be respectively coupled to one the 3rd that the first filter capacitor, second filter capacitor are stated with the respective one end of the 3rd filter capacitor
Phase terminal, one second phase terminal and one first phase terminal, first filter capacitor, second filter capacitor and the described 3rd
The respective other end of filter capacitor is to be connected to each other to a common port；And
One filter inductance unit, the filter inductance unit includes：
One first main winding inductance, with one first main winding low frequency end and one first main winding front end, wherein, described first
Main winding low frequency end is coupled to first phase terminal and the 3rd filter capacitor, the first main winding front end then coupling
It is connected to first ac terminal；
One first assists winding inductance, and the first main winding inductive, and with one first assists winding low frequency end and
First assists winding front end, wherein, the first assists winding low frequency end is coupled to the common port；
One second main winding inductance, with one second main winding low frequency end and one second main winding front end, wherein, described second
Main winding low frequency end is coupled to second phase terminal and second filter capacitor, and the second main winding front end is then coupled to
Second ac terminal；
One second assists winding inductance, and the second main winding inductive, with one second assists winding low frequency end and one
Two assists winding front ends, wherein, the second assists winding low frequency end is coupled to the first assists winding front end；
One the 3rd main winding inductance, with one the 3rd main winding low frequency end and one the 3rd main winding front end, wherein, the described 3rd
Main winding low frequency end is coupled to the third phase terminal and first filter capacitor, and the 3rd main winding front end is then coupled to this
3rd ac terminal；And
One the 3rd assists winding inductance, and the 3rd main winding inductive, and with one the 3rd assists winding low frequency end with
One the 3rd assists winding front end, wherein, the 3rd assists winding low frequency end is coupled to the second assists winding high frequency
End, and the 3rd assists winding front end is coupled to the earth terminal；
The first main winding inductance, the second main winding inductance and the 3rd main winding inductance are differential mode inductance.
2. the power conversion unit with suppression common mode noise function according to claim 1, it is characterised in that also wrap
Include：One compensating unit, one end of the compensating unit is coupled in the 3rd assists winding front end, the compensating unit it is another
One end is coupled in the earth terminal.
3. the power conversion unit with suppression common mode noise function according to claim 2, it is characterised in that the benefit
Unit is repaid for compensating electric capacity, compensation inductance, compensation resistance, above-mentioned both tandem compound, tandem compound of above-mentioned three.
4. the power conversion unit with suppression common mode noise function according to claim 2, it is characterised in that the benefit
Repay unit to be composed in series with a compensating electric capacity by a compensation inductance, and the sensibility reciprocal Lcomp of the compensation inductance meets following
Computing formula：Lcomp ＜ 2 (M-3L ')；Wherein, M is that three main winding inductance inside the filter inductance unit are auxiliary with three
The mutual induction amount of winding inductance is helped, and L ' is the inductance value of three assists winding inductance inside the filter inductance unit.
5. the power conversion unit with suppression common mode noise function according to claim 4, it is characterised in that the benefit
The sensibility reciprocal Lcomp for repaying inductance meets following computing formula：Lcomp=M-3L '.
6. the power conversion unit with suppression common mode noise function according to claim 1, it is characterised in that described
The turn ratio of one main winding inductance and the first assists winding inductance, the second main winding inductance and the described second auxiliary around
The turn ratio of group inductance and the turn ratio of the 3rd main winding inductance and the 3rd assists winding inductance, be all between
3:1.3 and 3:Between 0.7.
7. the power conversion unit with suppression common mode noise function according to claim 6, it is characterised in that described
The turn ratio of one main winding inductance and the first assists winding inductance, the second main winding inductance and the described second auxiliary around
The turn ratio of group inductance and the turn ratio of the 3rd main winding inductance and the 3rd assists winding inductance are all 3:1.
8. the power conversion unit with suppression common mode noise function according to claim 1, it is characterised in that the work(
Rate converter unit is one or two level power converter, three level power converter or other multi-level power converters.
9. the power conversion unit with suppression common mode noise function according to claim 1, it is characterised in that described
One DC terminal is coupled to one first electric device with second DC terminal.
10. the power conversion unit with suppression common mode noise function according to claim 9, it is characterised in that described
First electric device is electrical network, motor or energy storage units.
11. power conversion units with suppression common mode noise function according to claim 10, it is characterised in that also wrap
One second power conversion unit is included, is coupled in first electric device and first DC terminal and second direct current
Between terminal.
12. power conversion units with suppression common mode noise function according to claim 11, it is characterised in that described
Second power conversion unit is the rectification unit of an AC-to DC or a direct current to ac converter unit.
13. power conversion units with suppression common mode noise function according to claim 1, it is characterised in that described
First phase terminal, second phase terminal and the third phase terminal are coupled to one second electric device.
14. power conversion units with suppression common mode noise function according to claim 13, it is characterised in that described
Second electric device is electrical network or motor.
15. power conversion units with suppression common mode noise function according to claim 13, it is characterised in that more wrap
An EMI FILTER is included, is coupled in the filter capacitor unit and first phase terminal, second phase terminal and the 3rd
Between phase terminal.
16. power conversion units with suppression common mode noise function according to claim 15, it is characterised in that described
EMI FILTER includes：
One first EMI Filtering inductance, its one end is coupled in first phase terminal, and its other end is coupled in described first
Filter capacitor；
One second EMI Filtering inductance, its one end is coupled in second phase terminal, and its other end is coupled in described second
Filter capacitor；
One the 3rd EMI Filtering inductance, its one end is coupled in the third phase terminal, and its other end is coupled in described
Three filter capacitors；
One first EMI Filtering electric capacity, its one end is coupled in the first EMI Filtering inductance, and its other end coupling
It is connected on the second EMI Filtering inductance；
One second EMI Filtering electric capacity, its one end is coupled in the second EMI Filtering inductance, and its other end coupling
It is connected on the 3rd EMI Filtering inductance；And
One the 3rd EMI Filtering electric capacity, its one end is coupled in the first EMI Filtering inductance, and its other end coupling
It is connected on the 3rd EMI Filtering inductance.
17. power conversion units with suppression common mode noise function according to claim 15, it is characterised in that described
EMI FILTER includes：
One first EMI Filtering inductance, its one end is coupled in first phase terminal, and its other end is coupled in described
One filter capacitor；
One second EMI Filtering inductance, its one end is coupled in second phase terminal, and its other end is coupled in described
Two filter capacitors；
One the 3rd EMI Filtering inductance, its one end is coupled in the third phase terminal, and its other end is coupled in described
Three filter capacitors；
One first EMI Filtering electric capacity, its one end is coupled in the 3rd EMI Filtering inductance, and its other end coupling
It is connected on the earth terminal；
One second EMI Filtering electric capacity, its one end is coupled in the second EMI Filtering inductance, and its other end coupling
It is connected on the earth terminal；And
One the 3rd EMI Filtering electric capacity, its one end is coupled in the first EMI Filtering inductance, and its other end coupling
It is connected on the earth terminal.
18. power conversion units with suppression common mode noise function according to claim 1, it is characterised in that described
Power conversion unit is a phase three-wire three power conversion unit.
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| CN201410020818.XA CN104795986B (en) | 2014-01-16 | 2014-01-16 | Power conversion device with common-mode noise suppression function |
| TW103120628A TWI500246B (en) | 2014-01-16 | 2014-06-13 | Power-converting device having common mode noise-suppressing function |
| US14/322,417 US9312753B2 (en) | 2013-07-02 | 2014-07-02 | Power converter with low common mode noise |
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| CN201410020818.XA CN104795986B (en) | 2014-01-16 | 2014-01-16 | Power conversion device with common-mode noise suppression function |
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| CN104795986B true CN104795986B (en) | 2017-05-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11509239B2 (en) | 2020-05-26 | 2022-11-22 | Delta Electronics (Shanghai) Co., Ltd | Conversion device having reduced size and cost |
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| US10476381B1 (en) * | 2018-11-13 | 2019-11-12 | Rockwell Automation Technologies, Inc. | Power conversion system and filter therefor |
| TWI729333B (en) * | 2018-12-13 | 2021-06-01 | 台達電子工業股份有限公司 | Power converter with common dc power source and power supply apparatus having the same |
| CN110571854B (en) * | 2019-09-06 | 2023-10-20 | 深圳市禾望电气股份有限公司 | Wind power generation system |
| CN113824121B (en) * | 2021-11-23 | 2022-02-22 | 青岛鼎信通讯股份有限公司 | Structure applied to flexible direct-current comprehensive voltage regulating device for inhibiting common-mode interference |
| JP2023177397A (en) * | 2022-06-02 | 2023-12-14 | 三菱電機株式会社 | Power conversion device |
| TWI852574B (en) * | 2023-05-22 | 2024-08-11 | 亞源科技股份有限公司 | Common-mode noise cancellation circuit and switching power converter with passive common-mode noise cancellation function |
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| TWI500246B (en) | 2015-09-11 |
| CN104795986A (en) | 2015-07-22 |
| TW201530992A (en) | 2015-08-01 |
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