CN109713891A - A kind of non-isolated multilevel converter - Google Patents
A kind of non-isolated multilevel converter Download PDFInfo
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- CN109713891A CN109713891A CN201910116916.6A CN201910116916A CN109713891A CN 109713891 A CN109713891 A CN 109713891A CN 201910116916 A CN201910116916 A CN 201910116916A CN 109713891 A CN109713891 A CN 109713891A
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Abstract
The present invention provides a kind of non-isolated multilevel converter, at least one first non-isolated converter and at least one second non-isolated converter including series connection and the intermediate DC link circuit between first non-isolated converter and the second non-isolated converter further include positioned at least one common mode inductance on the intermediate DC link circuit.The present invention can greatly reduce the high frequency common mode voltage of AC or DC port, so as to effectively inhibit the size of leakage current, and be conducive to exchange and design with DC port EMC filter.The available thinner conducting wire coiling of common mode inductance used in the present invention, can bring volume, weight, loss or the reduction of cost of common mode inductance.This hair is suitable for direct current input/output wide-voltage range or low-voltage direct, phase three-wire three or three-phase four wire system.The present invention seals in common mode inductance between non-isolated converter and non-isolated inverter, and making non-isolated multilevel converter, impedance loop increases over the ground, can there is the high frequency common mode voltage over the ground for inhibiting exchange side and DC side to generate, and realizes leakage current and conducts the inhibition of EMC.
Description
Technical field
The invention belongs to electrical technical field more particularly to a kind of non-isolated multilevel converters.
Technical background
For current leakage existing for non-isolated multilevel converter (such as DC/DC+DC/AC), there are commonly following several
Solution: changing topological structure, changes modulation system, increases circuit in the input/output end port of exchange side or DC side and hinders
The methods of resist.
Change topological structure to be widely applied in non-isolated converter: leak electricity for single-phase DC/DC+DC/AC inverter
Flow problem increases switching device on the basis of H4 bridge, changes DC/AC topological structure (HERIC topology, H5 topology, H6 topology)
High frequency common mode voltage can well be inhibited, realize the inhibition to leakage current.In three-phase tri-level inverter, by by bus capacitor
Midpoint is connected with N line also can be good at realizing the inhibition of leakage current, but usually need corresponding balancing control algolithm or balancing
The complexity of circuit, system increases.
The inhibition for being also able to achieve high frequency common mode voltage and leakage current by changing modulation system, such as passes through SPWM modulation system
Than having smaller leakage current using the SVPWM modulation system of neighbouring vectors, but its voltage utilization is low, it usually needs higher
DC bus brings device voltage stress to increase with loss.To reach high voltage utilization rate and realizing that high frequency common mode voltage reduces
Or the purpose eliminated, associated specialist scholar propose the SVPWM modulation methods of various new by choosing different voltage vectors
Formula, new modulation system can effectively drop reduction or inhibit leakage current, but there is also corresponding disadvantages, such as realize that difficult, THD increases
Or because additional on-off times bring additional switching loss.
The input/output end port of exchange side or DC side increase common mode inductance increase impedance loop be it is a kind of it is the most frequently used with
Simple implementation.This mode for increasing common mode inductance in input/output end port is easier reality for low-power circuit
It is existing, and the circuit of relatively high power is implemented and is not easy to, it usually needs biggish common mode inductance, to bring system
Volume, weight, loss or the increase of cost.This is mainly due to exchange side voltage is usual lower (phase voltage 220V or so), electric current
It is larger, the conducting wire of big sectional area is needed, and for phase three-wire three or three-phase four wire system, then needs being total to for three line of coiling or four lines
Mould inductance, volume is bigger, is also more difficult to realize；Also have and increase the way of common mode inductance in direct current input/output terminal, although DC terminal
Common mode inductance only need two lines, but in wide-voltage range be meet full voltage range full power output, in low pressure
The case where there is also high currents, therefore it is also required to the coiling of thick diameter, it implements very difficult.It is defeated for the direct current of multiple branch circuit
Enter/export (such as multichannel photovoltaic inputs, the input/output of multichannel battery or cell photovoltaic combination input), the electric current phase of each branch
To the smaller common mode inductance that can select small cross sections coiling, but the quantity of one side common mode inductance increases, on the other hand because each
Branch is parallel relationship over the ground, and each branch of the inhibition to realize common-mode voltage over the ground and leakage current needs bigger sensibility reciprocal, real
Border, which implements, to be also not easy.
Summary of the invention
The purpose of the present invention is to provide one kind can the high frequency common mode voltage over the ground for inhibiting exchange side and DC side to generate,
It realizes leakage current and conducts the non-isolated multilevel converter of the inhibition of EMC.
A kind of non-isolated multilevel converter, at least one first non-isolated converter including series connection and at least one
Second non-isolated converter and the intermediate dc between first non-isolated converter and the second non-isolated converter
Link circuit further includes positioned at least one common mode inductance on the intermediate DC link circuit.
Preferably, it connects before the first of series connection the non-isolated converter and the second non-isolated inverter or arranged side by side one
A or multiple first non-isolated converters or the second non-isolated inverter, or the first non-isolated converter being connected in series and the
Series connection or one or more first non-isolated converters arranged side by side or the second non-isolated inverter behind two non-isolated inverters.
Preferably, first non-isolated converter be equipped with it is multiple, multiple first non-isolated converters connect side by side after and
Second non-isolated converter is connected in series.
Preferably, first non-isolated converter is equipped with multiple, multiple first non-isolated converters be connected in series after with
Second non-isolated converter is connected in series.
Preferably, second non-isolated converter be equipped with it is multiple, multiple second non-isolated converters connect side by side after and
First non-isolated converter is connected in series.
Preferably, second non-isolated converter is equipped with multiple, multiple second non-isolated converters be connected in series after with
First non-isolated converter is connected in series.
Preferably, first non-isolated converter is DC to DC converter, and second non-isolated converter is
Direct current delivers current converter.
Preferably, first non-isolated converter and the second non-isolated converter are DC to DC converter.
Preferably, first non-isolated converter and the second non-isolated converter are DC to DC converter.
Preferably, the common mode inductance is two-wire system or multiple-way system.
The present invention can greatly reduce the high frequency common mode voltage of AC or DC port, so as to effectively inhibit leakage current
Size, and be conducive to exchange with DC port EMC filter design.The available thinner conducting wire of common mode inductance used in the present invention around
System, can bring volume, weight, loss or the reduction of cost of common mode inductance.This hair is suitable for direct current input/output Width funtion
In range or low-voltage direct, phase three-wire three or three-phase four wire system.The present invention non-isolated converter and non-isolated inverter it
Between seal in common mode inductance, make non-isolated multilevel converter over the ground impedance loop increase, can have inhibition exchange side and DC side generate
High frequency common mode voltage over the ground, realize leakage current and conduct EMC inhibition.
Detailed description of the invention
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, the present invention is given furtherly
It is bright.
Fig. 1 is the structural schematic diagram of the non-isolated multilevel converter first embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the non-isolated multilevel converter second embodiment of the present invention.
Specific embodiment
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, Detailed description of the invention will be compareed below
A specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically shown in each figure, they are not represented
Its practical structures as product.In addition, there is identical structure or function in some figures so that simplified form is easy to understand
Component only symbolically depicts one of those, or has only marked one of those.Herein, "one" is not only indicated
" only this ", can also indicate the situation of " more than one ".
Technical solution of the present invention is discussed in detail with specific embodiment below.
The non-isolated multilevel converter of the present invention, as shown in Figure 1 comprising a first non-isolated converter of series connection
20 and the second non-isolated inverter 40, the DC bus ring between non-isolated converter 20 and non-isolated inverter 40
Economize on electricity road 21 and at least one common mode inductance L in DC bus link 21.
Wherein DC bus link circuit 21 is DC-link, and as an intermediate link circuit, intermediate link circuit 21 contains
There is bus capacitor, the present invention is by additionally joined common mode inductance L in direct current intermediate link circuit 21.
In other embodiments, the multiple first non-isolated connections side by side of converter 20 can be set, multiple first is non-isolated
Converter 20 is connected in series after connecting side by side with the second non-isolated converter 40, at least one common mode inductance L is located at connection side by side
The multiple first non-isolated converters 20 and the second non-isolated converter 40 between.
In other embodiments, the multiple first non-isolated converters 20 can be set to be connected in series, multiple first is non-isolated
Converter 20 is connected in series after being connected in series with the second non-isolated converter 40, at least one common mode inductance L, which is located at, to be connected in series
The multiple first non-isolated converters 20 and the second non-isolated converter 40 between.
In other embodiments, the multiple second non-isolated connections side by side of converter 40 can be set, multiple second is non-isolated
Converter 40 is connected in series after connecting side by side with the first non-isolated converter 20, at least one common mode inductance L is located at connection side by side
The multiple second non-isolated converters 40 and the first non-isolated converter 20 between.
In other embodiments, the multiple second non-isolated converters 40 can be set to be connected in series, multiple second is non-isolated
Converter 40 is connected in series after being connected in series with the first non-isolated converter 20, at least one common mode inductance L, which is located at, to be connected in series
The multiple second non-isolated converters 40 and the first non-isolated converter 20 between.
In other embodiments, a first non-isolated converter 20 and a second non-isolated inverter for series connection
It can also connect before 40 or one or more first non-isolated inverters 40 of non-isolated converter 20 or the second side by side, or
It can also connect or simultaneously behind the first non-isolated converter 20 and a second non-isolated inverter 40 being connected in series
Arrange one or more first non-isolated inverters 40 of non-isolated converter 20 or the second.
Wherein, the first non-isolated converter 20 is DC to DC converter (DC/DC), and the second non-isolated converter 40 is
Direct current delivers current converter (DC/AC) or the first non-isolated converter 20 and the second non-isolated converter 40 is that direct current turns
Direct current transducer (DC/DC) or the first non-isolated converter 20 and the second non-isolated converter 40 are that DC to DC turns
Parallel operation (DC/AC).
In the embodiment shown in fig. 1, first non-isolated converter 20 and a second non-isolated transformation are only set
Device 40, non-isolated multilevel converter further include DC bus 100, positioned at first input/output terminal 10 of 100 one end of bus and position
In the second input/output terminal 30 of 100 other end of DC bus；First non-isolated converter 20 and the first input/output terminal 10
Connection, the second non-isolated converter 40 and the second input/output terminal 30, direct current intermediate link circuit 21 be located at first input/it is defeated
Between outlet 10 and the second input/output terminal 30.
Common mode inductance can be two-wire system, be also possible to multiple-way system (for multilevel system), such as in 3 level systems
In, three line inductance (as shown in Figure 2) can be used, electric current still flows primarily through positive and negative busbar, and electric current is smaller between connecting bus midpoint, because
The coiling at this connection bus midpoint can select thinner coiling, equally bring clear superiority.
In the present embodiment, common mode inductance L is two-wire system, and two-wire system common mode inductance L is located at DC bus link circuit 21
On.
DC bus link circuit 21 has the first bus capacitor C1 and the second bus capacitor C2, there is the first bus capacitor C1
It is located at the two sides of common mode inductance L with the second bus capacitor C2
Seal in common mode inductance L on the DC bus 100 of the non-isolated multilevel converter of the present invention, by bus capacitor be divided into C1 with
C2 two parts, common mode inductance L's seals in, so that impedance loop increases over the ground, non-isolated converter 20 or non-isolated inverter 40
The common-mode voltage that operational process generates will be mainly distributed on common mode inductance L, make to exchange side and DC side high frequency common mode electricity over the ground
Pressure can be effectively suppressed, and the leakage current for flowing into Y capacitance or parasitic capacitance Cp effectively reduces, and DC side is total to side high frequency is exchanged
The reduction of mode voltage is also beneficial to the design of EMC filter at port.
For common voltage-type topology, usual DC bus is higher compared with the voltage of input terminal and output end.Therefore, in phase
With under load, increase common mode inductance herein, electric current is smaller, and electric current mainly passes through positive and negative busbar two with line.Obtaining phase in this way
Under the premise of sensibility reciprocal, thinner conducting wire coiling is can be selected in common mode inductance, accordingly can be very shorter using smaller magnet ring
Coiling can bring the reduction of volume, weight, loss or cost, implement and be more easier.In the wide electricity of direct current input/output
Press range or low-voltage direct, phase three-wire three or three-phase four wire system, this method advantage more obvious.
As shown in Fig. 2, common mode inductance L be three-wire system, bus capacitor have 4 bus capacitors, respectively C1, C2, C3 and
C4。
Bus capacitor divides C1 and C2 setting up and down and the side of common mode inductance L, bus capacitor C3 and C4 it is also setting up and down and
The other side of common mode inductance L.
Direct current in Fig. 1 and Fig. 2 is only made to illustrate with AC port with the mode of connection, is not limited to input/output type, such as:
Input/output can be multichannel or single channel photovoltaic, multichannel or single channel battery, cell photovoltaic combination, single-phase AC, three-phase AC.
The non-isolated multilevel converter of the present invention is not limited to Fig. 1 and two-stage shown in Fig. 2, can also be the series connection of more stages with
Parallel connection, as photovoltaic is in parallel in bus bar side through DC/DC with battery through DC/DC.
For direct current a 200~700V of input/output, busbar voltage 800V, four line 220VAC of AC three-phase, specified function
Rate is the DC/DC+DC/AC system of 100kVA.If inhibiting electric leakage by increasing the method that common mode inductance L improves impedance loop over the ground
The size of stream.
If adding in exchange side: needing 4 line common mode inductances, coiling overcurrent 100kVA/3/220V=151A.
If adding in DC side: needing 2 line common mode inductances, coiling overcurrent 100kVA/200V=500A.
Using the present invention program: needing 2 line common mode inductances, coiling overcurrent 100kVA/800V=125A.
Thinner conducting wire, less line number can wind more the number of turns under identical magnet ring, and big because of inductance
Small square for being proportional to the number of turns, therefore the identical sensibility reciprocal of acquisition can select smaller magnet ring, more short length and thinner coiling,
Bring the reduction of volume, weight, loss or cost.
The present invention can greatly reduce the high frequency common mode voltage of AC or DC port, so as to effectively inhibit leakage current
Size, and be conducive to exchange with DC port EMC filter design.The available thinner conducting wire of common mode inductance used in the present invention around
System, can bring volume, weight, loss or the reduction of cost of common mode inductance.This hair is suitable for direct current input/output Width funtion
In range or low-voltage direct, phase three-wire three or three-phase four wire system.
The present invention seals in common mode inductance between non-isolated converter and non-isolated inverter, makes non-isolated multilevel converter
Impedance loop increases over the ground, can there is the high frequency common mode voltage over the ground for inhibiting exchange side and DC side to generate, and realizes leakage current and passes
Lead the inhibition of EMC.
It should be noted that above-described embodiment can be freely combined as needed.The above is only of the invention preferred
Embodiment, but the present invention is not limited to the specific details in the above embodiment, it is noted that for the art
For those of ordinary skill, within the scope of the technical concept of the present invention, without departing from the principle of the present invention, it can also do
Several improvements and modifications out carry out a variety of equivalents to technical solution of the present invention, these improvement, retouching and equivalents
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of non-isolated multilevel converter, at least one first non-isolated converter including series connection and at least one the
Two non-isolated converters and the intermediate dc ring between first non-isolated converter and the second non-isolated converter
Economize on electricity road, which is characterized in that further include positioned at least one common mode inductance on the intermediate DC link circuit.
2. non-isolated multilevel converter according to claim 1, which is characterized in that the non-isolated conversion of the first of series connection
Series connection or one or more first non-isolated converters or second non-isolated inverse side by side before device and the second non-isolated inverter
Become device, or series connection or one or more arranged side by side behind the first non-isolated converter and the second non-isolated inverter being connected in series
A first non-isolated converter or the second non-isolated inverter.
3. non-isolated multilevel converter according to claim 1, which is characterized in that first non-isolated converter is equipped with
Multiple, multiple first non-isolated converters are connected in series after connecting side by side with second non-isolated converter.
4. non-isolated multilevel converter according to claim 1, which is characterized in that first non-isolated converter is equipped with
Multiple, multiple first non-isolated converters are connected in series after being connected in series with second non-isolated converter.
5. non-isolated multilevel converter according to claim 1, which is characterized in that second non-isolated converter is equipped with
Multiple, multiple second non-isolated converters are connected in series after connecting side by side with first non-isolated converter.
6. non-isolated multilevel converter according to claim 1, which is characterized in that second non-isolated converter is equipped with
Multiple, multiple second non-isolated converters are connected in series after being connected in series with first non-isolated converter.
7. -6 any non-isolated multilevel converter according to claim 1, which is characterized in that the first non-isolated transformation
Device is DC to DC converter, and second non-isolated converter is that direct current delivers current converter.
8. -6 any non-isolated multilevel converter according to claim 1, which is characterized in that the first non-isolated transformation
Device and the second non-isolated converter are DC to DC converter.
9. -6 any non-isolated multilevel converter according to claim 1, which is characterized in that the first non-isolated transformation
Device and the second non-isolated converter are DC to DC converter.
10. non-isolated multilevel converter according to claim 1, which is characterized in that the common mode inductance be two-wire system or
Multiple-way system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910116916.6A CN109713891A (en) | 2019-02-15 | 2019-02-15 | A kind of non-isolated multilevel converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910116916.6A CN109713891A (en) | 2019-02-15 | 2019-02-15 | A kind of non-isolated multilevel converter |
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| Publication Number | Publication Date |
|---|---|
| CN109713891A true CN109713891A (en) | 2019-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910116916.6A Withdrawn CN109713891A (en) | 2019-02-15 | 2019-02-15 | A kind of non-isolated multilevel converter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040095784A1 (en) * | 2002-11-19 | 2004-05-20 | Dongsheng Zhou | Reduced capacitance AC/DC/AC power converter |
| CN101777836A (en) * | 2009-12-31 | 2010-07-14 | 南京博兰得电子科技有限公司 | Electric energy isolation transmission method and isolation transmission device |
| CN102638172A (en) * | 2011-02-09 | 2012-08-15 | 洛克威尔自动控制技术股份有限公司 | Power converter with common mode voltage reduction |
| CN103178696A (en) * | 2011-12-21 | 2013-06-26 | 鸿富锦精密工业(武汉)有限公司 | Power source circuit |
| CN107925247A (en) * | 2015-08-12 | 2018-04-17 | 通用电气公司 | Method and system for the voltage source high voltage direct current transmission system switched based on flue |
-
2019
- 2019-02-15 CN CN201910116916.6A patent/CN109713891A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040095784A1 (en) * | 2002-11-19 | 2004-05-20 | Dongsheng Zhou | Reduced capacitance AC/DC/AC power converter |
| CN101777836A (en) * | 2009-12-31 | 2010-07-14 | 南京博兰得电子科技有限公司 | Electric energy isolation transmission method and isolation transmission device |
| CN102638172A (en) * | 2011-02-09 | 2012-08-15 | 洛克威尔自动控制技术股份有限公司 | Power converter with common mode voltage reduction |
| CN103178696A (en) * | 2011-12-21 | 2013-06-26 | 鸿富锦精密工业(武汉)有限公司 | Power source circuit |
| CN107925247A (en) * | 2015-08-12 | 2018-04-17 | 通用电气公司 | Method and system for the voltage source high voltage direct current transmission system switched based on flue |
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Application publication date: 20190503 |