CN110086365A - A kind of three level grid-connected converter topology of midpoint self-balancing - Google Patents
A kind of three level grid-connected converter topology of midpoint self-balancing Download PDFInfo
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- CN110086365A CN110086365A CN201910367974.6A CN201910367974A CN110086365A CN 110086365 A CN110086365 A CN 110086365A CN 201910367974 A CN201910367974 A CN 201910367974A CN 110086365 A CN110086365 A CN 110086365A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- Power Engineering (AREA)
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- Inverter Devices (AREA)
Abstract
The invention belongs to power electronics fields, are used for distributed generation system, and in particular to three level grid-connected converter midpoint self-balancing topology of one kind.It include: three-level current transformer, inductance La、Lb、Lc、Lga、Lgb、Lgc, capacitor Ca, capacitor Cb, capacitor Cc, capacitor CrAnd it is set to the capacitor C of DC side1And capacitor C2.The mentioned topology of the present invention can be in DC bus capacitor C1、C2When partial pressure is unequal, realize that DC voltage is quickly divided equally, and maintenance voltage is divided equally；Under the premise of not increasing switching device and DC voltage sensor, the mentioned topology of the present invention can be realized self-balancing DC side midpoint potential, and switch tube voltage stress is avoided to differ, and improve the service life of grid-connected current quality and current transformer.
Description
Technical field
The invention belongs to power electronics fields, and in particular to a kind of three level grid-connected converter of midpoint self-balancing is opened up
It flutters, is used for Grid-connected Distributed Generation Power System.
Background technique
With the rapid development of distributed generation resource, interactive interface of the grid-connected converter as distributed generation resource and power grid, hair
Very important effect is waved.Three level neutral point clamped multi NPC and T-NPC structure current transformers due to its output harmonic wave content compared with
It is low, it is widely used in high-power hierarchical system.In the ideal case, the DC side of three-level current transformer is identical by two parameters
Derided capacitors are connected in series, and the voltage of capacitor is the half of DC bus-bar voltage, but since capacitor's capacity is inclined in real system
Difference, modulating wave are there are factors such as even-order harmonic, threephase load off-center operations, and there are midpoint potential drifting problems.And midpoint is electric
Position drift will deteriorate power quality, increase grid-connected current low-order harmonic content.
In the prior art, the method for controlling midpoint potential, which mainly has, to be improved modulation strategy with control algolithm and increases hardware
Circuit two ways.When circuit uses SVPWM modulation system, by measuring capacitor potential difference, change redundant vectors are utilized
Action time adjusts midpoint potential, however this mode is but to increase harmonic distortion, use complex control strategy and more
Voltage sensor be cost；By introducing the coefficient of midpoint electric current and capacitor midpoint potential relationship, according to mid-point voltage difference
Injection current in middle wire value is calculated, but this method does not consider the deviation of DC bus capacitor value, when DC bus capacitor capacity
When there is deviation, which cannot be applicable in well；Self-balancing concept, can by neutral point natural stability in DC side midpoint,
Due to by traditional circuit itself adjust, midpoint potential restore transient state time it is longer, to make circuit be rapidly achieved balance, pass through by
RLC adjusting circuit is in parallel with load, can shorten the circuit transient recovery time.But the circuit is mainly used for being connected with load
Current transformer, load influence each other for self-balancing effect, and RLC branch increase circuit loss, at grid-connected converter midpoint
Self-balancing mechanism is unclear.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of three level grid-connected converter topology of midpoint self-balancing, being capable of structure
The zero-sequence current access for building filter capacitor neutral point Yu DC bus capacitor midpoint, the impedance of the access is reduced by series resonance
Value realizes circuit self-balancing.
The present invention is achieved by the following technical solutions:
A kind of three level grid-connected converter topology of midpoint self-balancing, comprising: capacitor Ca, capacitor Cb, capacitor Cc, capacitor CrAnd
It is set to the capacitor C of DC side1And capacitor C2, three-level current transformer, inductance La, inductance Lb, inductance Lc, inductance Lga, inductance Lgb、
Inductance Lgc6 inductance；
The capacitor C1One end be connected with DC power anode, the capacitor C2One end be connected with DC power cathode,
The capacitor C1The other end and the capacitor C2The other end be connected constitute capacitor midpoint O point；
The DC power anode, the DC power cathode and equal and described three level of the capacitor midpoint O point become
Flow device one end connection, the other end of the three-level current transformer respectively with the inductance La, the inductance LbAnd the inductance Lc
One end connection；
The inductance LaThe other end and the capacitor CaOne end and the inductance LgaOne end be connected；The inductance
LbThe other end and the capacitor CbOne end and the inductance LgbOne end be connected；The inductance LcThe other end and described
Capacitor CcOne end and the inductance LgcOne end be connected；
The capacitor Ca, the capacitor CbAnd the capacitor CcThe other end be interconnected to constitute capacitor neutral point；The electricity
Hold CrOne end be connected with the capacitor neutral point, the capacitor CrThe other end and the capacitor midpoint O point, the direct current
Source anode or the DC power cathode are connected；
The inductance Lga, the inductance LgbAnd the inductance LgcThe other end be connected respectively with a, b, c three-phase of power grid.
Further, when the three-level current transformer uses NPC structure, including switching tube S1, switching tube S2, switching tube S3、
Switching tube S4, switching tube S5, switching tube S6, switching tube S7, switching tube S8, switching tube S9, switching tube S10, switching tube S11, switching tube
S1212 switching tubes and diode D1, diode D2, diode D3, diode D4, diode D5, diode D66 two poles
Pipe；
The switching tube S1, the switching tube S5And the switching tube S9The end D connected with DC power anode；It is described
Switching tube S2, the switching tube S6And the switching tube S10The end D respectively with the switching tube S1, the switching tube S5And it is described
Switching tube S9The connection of the end S, and the diode D1, the diode D2, the diode D3The pole N respectively with the switch
Pipe S1, the switching tube S5And the switching tube S9The end S connection；The diode D1, the diode D2, the diode D3
P be extremely connected with the capacitor midpoint O point；
The switching tube S4, the switching tube S8And the switching tube S12The end S connected with DC power cathode；It is described
Switching tube S3, the switching tube S7And the switching tube S11The end S respectively with the switching tube S4, the switching tube S8And it is described
Switching tube S12The connection of the end D, and the diode D4, the diode D5And the diode D6The pole P opened respectively with described
Close pipe S4, the switching tube S8And the switching tube S12The end D connection；The diode D4, the diode D5And two pole
Pipe D6N be extremely connected with the capacitor midpoint O point；
The switching tube S2The end S and the switching tube S3The end D and the inductance LaOne end be connected；The switch
Pipe S6The end S and the switching tube S7The end D and the inductance LbOne end be connected；The switching tube S10The end S and described open
Close pipe S11The end D and the inductance LcOne end be connected.
Further, when the three-level current transformer uses TNPC structure, including switching tube S1, switching tube S2, switching tube
S3, switching tube S4, switching tube S5, switching tube S6, switching tube S7, switching tube S8, switching tube S9, switching tube S10, switching tube S11, switch
Pipe S1212 switching tubes；
The switching tube S1, the switching tube S5And the switching tube S9The end D connected with DC power anode；It is described
Switching tube S4, the switching tube S8And the switching tube S12The end S connected with DC power cathode；The switching tube S3, it is described
Switching tube S7And the switching tube S11The end S connected with the capacitor midpoint O point；The switching tube S2, the switching tube S6And
The switching tube S10The end D respectively with the switching tube S3, the switching tube S7And the switching tube S11The end D connection；
The switching tube S1The end S, the switching tube S2The end S and the switching tube S4The end D and the inductance
LaOne end be connected；
The switching tube S5The end S, the switching tube S6The end S and the switching tube S8The end D and the inductance
LbOne end be connected；
The switching tube S9The end S, the switching tube S10The end S and the switching tube S12The end D and the inductance
LcOne end be connected.
Further, the inductance La, the inductance Lb, the inductance Lc, the inductance Lga, the inductance Lgb, it is described
Inductance LgcWith the capacitor Ca, the capacitor Cb, the capacitor CcConstitute LCL filter.
Further, the capacitor CrParameter selection meets:
X=a, b, c
Wherein, ωcFor carrier frequency.
Further, when the switching tube used is the insulated gate bipolar transistor with anti-paralleled diode, switching tube
The end D be collector, switching tube the end S be emitter, switching tube the end G be gate pole；
When the switching tube used is metal oxide layer semiconductor field effect transistor, the end D of switching tube is drain electrode, switch
The end S of pipe be source electrode, switching tube the end G be grid；
Beneficial effects of the present invention:
(1) three level grid-connected converter topology of a kind of midpoint self-balancing provided by the invention: when DC capacitor voltage point
When pressing unbalanced, by using capacitor CrWith DC bus capacitor midpoint, the DC power anode or the DC power cathode
It is connected, provides the access of reflux for zero-sequence current；Pass through capacitor CrThe reasonable selection of capacitance is reduced using series resonance
Zero sequence path resistance so that there are the increases of carrier frequency primary current in current in middle wire, and then realizes DC side partial pressure balance.
(2) self-balancing three level grid-connected converter topology in midpoint provided by the invention can not increase switching device and straight
In the case where flowing side voltage sensor, DC voltage equipartition time is set to get a promotion, to avoid switch tube voltage stress not
Deng improving the service life of grid-connected current quality and current transformer.
Detailed description of the invention
Fig. 1 is a kind of three level grid-connected converter topology diagram (capacitor C of midpoint self-balancing in the embodiment of the present inventionr's
The other end is connected with capacitor midpoint O point).
Fig. 2 is a kind of three level grid-connected converter topology diagram (capacitor C of midpoint self-balancing in the embodiment of the present inventionr's
The other end is connected with DC power anode).
Fig. 3 is a kind of three level grid-connected converter topology diagram (capacitor C of midpoint self-balancing in the embodiment of the present inventionr's
The other end is connected with DC power cathode).
Fig. 4 is a kind of three level grid-connected converter topology diagram of midpoint self-balancing in another embodiment of the present invention；
Fig. 5 is a kind of three level grid-connected converter topology diagram of midpoint self-balancing in another embodiment of the present invention；
Fig. 6 is traditional three-level current transformer DC voltage neutral balance time and experimental waveform；
Fig. 7 is topological structure DC voltage neutral balance time of the present invention and experimental waveform.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
For in the prior art, three-level current transformer there is technical issues that midpoint potential, and midpoint potential drifts about
Power quality will be deteriorated, increase grid-connected current low-order harmonic content.
The present invention provides a kind of three level grid-connected converter topology embodiment of midpoint self-balancing, as shown in Figs. 1-3, comprising:
Capacitor Ca, capacitor Cb, capacitor Cc, capacitor CrAnd it is set to the capacitor C of DC side1And capacitor C2, three-level current transformer, inductance La、
Inductance Lb, inductance Lc, inductance Lga, inductance Lgb, inductance Lgc6 inductance；
The capacitor C1One end be connected with DC power anode, the capacitor C2One end be connected with DC power cathode,
The capacitor C1The other end and the capacitor C2The other end be connected constitute capacitor midpoint O point；
The DC power anode, the DC power cathode and equal and described three level of the capacitor midpoint O point become
Flow device one end connection, the other end of the three-level current transformer respectively with the inductance La, the inductance LbAnd the inductance Lc
One end connection；
The inductance LaThe other end and the capacitor CaOne end and the inductance LgaOne end be connected；The inductance
LbThe other end and the capacitor CbOne end and the inductance LgbOne end be connected；The inductance LcThe other end and described
Capacitor CcOne end and the inductance LgcOne end be connected；
The capacitor Ca, the capacitor CbAnd the capacitor CcThe other end be interconnected to constitute capacitor neutral point；The electricity
Hold CrOne end be connected with the capacitor neutral point, the capacitor CrThe other end and capacitor midpoint O point (Fig. 1), described straight
It flows positive pole (Fig. 2) or the DC power cathode (Fig. 3) is connected；
The inductance Lga, the inductance LgbAnd the inductance LgcThe other end be connected respectively with a, b, c three-phase of power grid.
The present invention also provides a kind of three level grid-connected converter topology embodiments of midpoint self-balancing, as shown in Figure 4, comprising:
Switching tube S1, switching tube S2, switching tube S3, switching tube S4, switching tube S5, switching tube S6, switching tube S7, switching tube S8, switching tube
S9, switching tube S10, switching tube S11, switching tube S1212 switching tubes, diode D1, diode D2, diode D3, diode D4, two
Pole pipe D5, diode D66 diodes, inductance La, inductance Lb, inductance Lc, inductance Lga, inductance Lgb, inductance Lgc6 inductance, capacitor
Ca, capacitor Cb, capacitor Cc, capacitor C1, capacitor C2, capacitor Cr6 capacitors；
The capacitor C1One end be connected with DC power anode, the capacitor C2One end be connected with DC power cathode,
The capacitor C1The other end and the capacitor C2The other end be connected constitute capacitor midpoint O point；
The switching tube S1, the switching tube S5And the switching tube S9The end D connected with DC power anode；It is described
Switching tube S2, the switching tube S6And the switching tube S10The end D respectively with the switching tube S1, the switching tube S5And it is described
Switching tube S9The connection of the end S, and the diode D1, the diode D2, the diode D3The pole N respectively with the switch
Pipe S1, the switching tube S5And the switching tube S9The end S connection；The diode D1, the diode D2, the diode D3
P be extremely connected with the capacitor midpoint O point；
The switching tube S4, the switching tube S8And the switching tube S12The end S connected with DC power cathode；It is described
Switching tube S3, the switching tube S7And the switching tube S11The end S respectively with the switching tube S4, the switching tube S8And it is described
Switching tube S12The connection of the end D, and the diode D4, the diode D5And the diode D6The pole P opened respectively with described
Close pipe S4, the switching tube S8And the switching tube S12The end D connection；The diode D4, the diode D5And two pole
Pipe D6N be extremely connected with the capacitor midpoint O point；
The switching tube S2The end S and the switching tube S3The end D and the inductance LaOne end be connected；The switch
Pipe S6The end S and the switching tube S7The end D and the inductance LbOne end be connected；The switching tube S10The end S and described open
Close pipe S11The end D and the inductance LcOne end be connected；
The inductance LaThe other end and the capacitor CaOne end and the inductance LgaOne end be connected；The inductance
LbThe other end and the capacitor CbOne end and the inductance LgbOne end be connected；The inductance LcThe other end and described
Capacitor CcOne end and the inductance LgcOne end be connected；
The capacitor Ca, the capacitor CbAnd the capacitor CcThe other end and the capacitor CrOne end be connected, it is described
Capacitor CrThe other end be connected with the capacitor midpoint O point (in other embodiments, the capacitor CrThe other end can and institute
It states DC power anode or the DC power cathode is connected)；
The inductance Lga, the inductance LgbAnd the inductance LgcThe other end be connected respectively with a, b, c three-phase of power grid.
The present invention also provides a kind of three level grid-connected converter topology embodiments of midpoint self-balancing, as shown in Figure 5, comprising:
Capacitor Ca, capacitor Cb, capacitor Cc, capacitor CrAnd it is set to the capacitor C of DC side1And capacitor C2, three-level current transformer, inductance La、
Inductance Lb, inductance Lc, inductance Lga, inductance Lgb, inductance Lgc6 inductance；The three-level current transformer includes switching tube S1, switching tube
S2, switching tube S3, switching tube S4, switching tube S5, switching tube S6, switching tube S7, switching tube S8, switching tube S9, switching tube S10, switch
Pipe S11, switching tube S1212 switching tubes；
The capacitor C1One end be connected with DC power anode, the capacitor C2One end be connected with DC power cathode,
The capacitor C1The other end and the capacitor C2The other end be connected constitute capacitor midpoint O point；
The switching tube S1, the switching tube S5And the switching tube S9The end D connected with DC power anode；It is described
Switching tube S4, the switching tube S8And the switching tube S12The end S connected with DC power cathode；The switching tube S3, it is described
Switching tube S7And the switching tube S11The end S connected with the capacitor midpoint O point；The switching tube S2, the switching tube S6And
The switching tube S10The end D respectively with the switching tube S3, the switching tube S7And the switching tube S11The end D connection；
The switching tube S1The end S, the switching tube S2The end S and the switching tube S4The end D and the inductance
LaOne end be connected；
The switching tube S5The end S, the switching tube S6The end S and the switching tube S8The end D and the inductance
LbOne end be connected；
The switching tube S9The end S, the switching tube S10The end S and the switching tube S12The end D and the inductance
LcOne end be connected；
The inductance LaThe other end and the capacitor CaOne end and the inductance LgaOne end be connected；The inductance
LbThe other end and the capacitor CbOne end and the inductance LgbOne end be connected；The inductance LcThe other end and described
Capacitor CcOne end and the inductance LgcOne end be connected；
The capacitor Ca, the capacitor CbAnd the capacitor CcThe other end and the capacitor CrOne end be connected, it is described
Capacitor CrThe other end be connected with the capacitor midpoint O point (in other embodiments, the capacitor CrThe other end can and institute
It states DC power anode or the DC power cathode is connected)；
The inductance Lga, the inductance LgbAnd the inductance LgcThe other end be connected respectively with a, b, c three-phase of power grid.
In the above-described embodiments, the inductance La, the inductance Lb, the inductance Lc, the inductance Lga, the inductance
Lgb, the inductance LgcWith the capacitor Ca, the capacitor Cb, the capacitor CcLCL filter is constituted, it is high in electric current for filtering out
Frequency harmonic current.
In the above-described embodiments, the capacitor CrParameter selection meets:
X=a, b, c
Wherein, ωcFor carrier angular frequencies.
According to three-level current transformer SPWM modulation and the double Fourier of switch function it is found that when there are deviations for DC voltage
When, output phase voltage is distorted, and distortion harmonic content is broadly divided into even low-frequency harmonics, carrier frequency time and its sideband is humorous
Wave.Topology provided by the above embodiment of the present invention passes through capacitor CrA new zero sequence access is constituted, wherein CrValue is according to upper
Formula is stated to be calculated.The zero sequence paths connected in series resonance frequency is chosen to be carrier frequency time, since series resonant impedance is low, direct current
Carrier wave frequency zero-sequence current caused by side is uneven is able to more lead back DC bus capacitor midpoint, so that DC capacitor voltage is real
Now quickly divide equally.
It is illustrated in figure 6 traditional three-level current transformer neutral-point potential balance time and experimental waveform, Fig. 7 is present invention topology
Structure DC side neutral-point potential balance time and experimental waveform, comparison show that when deviation occurs in DC voltage, the present invention is topological
It is 3% even higher can be foreshortened to primary circuit by structure for equilibration time, hence it is evident that improve current transformer performance, significant effect.
In the above-described embodiments, when the switching tube used is the insulated gate bipolar transistor with anti-paralleled diode,
The end D of switching tube be collector, switching tube the end S be emitter, switching tube the end G be gate pole；When the switching tube used is gold
Belong to oxide layer semiconductor field effect transistor when, the end D of switching tube be drain electrode, switching tube the end S be the end G of source electrode, switching tube
For grid.
Claims (6)
1. a kind of three level grid-connected converter topology of midpoint self-balancing characterized by comprising capacitor Ca, capacitor Cb, capacitor Cc、
Capacitor CrAnd it is set to the capacitor C of DC side1And capacitor C2, three-level current transformer, inductance La, inductance Lb, inductance Lc, inductance Lga、
Inductance Lgb, inductance Lgc6 inductance；
The capacitor C1One end be connected with DC power anode, the capacitor C2One end be connected with DC power cathode, it is described
Capacitor C1The other end and the capacitor C2The other end be connected constitute capacitor midpoint O point；
The DC power anode, the DC power cathode and the equal and described three-level current transformer of capacitor midpoint O point
One end connection, the other end of the three-level current transformer respectively with the inductance La, the inductance LbAnd the inductance LcOne
End connection；
The inductance LaThe other end and the capacitor CaOne end and the inductance LgaOne end be connected；The inductance Lb's
The other end and the capacitor CbOne end and the inductance LgbOne end be connected；The inductance LcThe other end and the capacitor
CcOne end and the inductance LgcOne end be connected；
The capacitor Ca, the capacitor CbAnd the capacitor CcThe other end be interconnected to constitute capacitor neutral point；The capacitor Cr
One end be connected with the capacitor neutral point, the capacitor CrThe other end and the capacitor midpoint O point, the DC power supply just
Pole or the DC power cathode are connected；
The inductance Lga, the inductance LgbAnd the inductance LgcThe other end be connected respectively with a, b, c three-phase of power grid.
2. a kind of three level grid-connected converter topology of midpoint self-balancing according to claim 1, which is characterized in that three electricity
Flat current transformer uses NPC topological structure, including switching tube S1, switching tube S2, switching tube S3, switching tube S4, switching tube S5, switching tube
S6, switching tube S7, switching tube S8, switching tube S9, switching tube S10, switching tube S11, switching tube S1212 switching tubes and diode
D1, diode D2, diode D3, diode D4, diode D5, diode D66 diodes；
The switching tube S1, the switching tube S5And the switching tube S9The end D connected with DC power anode；The switch
Pipe S2, the switching tube S6And the switching tube S10The end D respectively with the switching tube S1, the switching tube S5And the switch
Pipe S9The connection of the end S, and the diode D1, the diode D2, the diode D3The pole N respectively with the switching tube S1、
The switching tube S5And the switching tube S9The end S connection；The diode D1, the diode D2, the diode D3The pole P
It is connected with the capacitor midpoint O point；
The switching tube S4, the switching tube S8And the switching tube S12The end S connected with DC power cathode；The switch
Pipe S3, the switching tube S7And the switching tube S11The end S respectively with the switching tube S4, the switching tube S8And the switch
Pipe S12The connection of the end D, and the diode D4, the diode D5And the diode D6The pole P respectively with the switching tube
S4, the switching tube S8And the switching tube S12The end D connection；The diode D4, the diode D5And the diode D6
N be extremely connected with the capacitor midpoint O point；
The switching tube S2The end S and the switching tube S3The end D and the inductance LaOne end be connected；The switching tube S6's
The end S and the switching tube S7The end D and the inductance LbOne end be connected；The switching tube S10The end S and the switching tube
S11The end D and the inductance LcOne end be connected.
3. a kind of three level grid-connected converter topology of midpoint self-balancing according to claim 1, which is characterized in that three electricity
Flat current transformer uses TNPC topological structure, including switching tube S1, switching tube S2, switching tube S3, switching tube S4, switching tube S5, switch
Pipe S6, switching tube S7, switching tube S8, switching tube S9, switching tube S10, switching tube S11, switching tube S1212 switching tubes；
The switching tube S1, the switching tube S5And the switching tube S9The end D connected with DC power anode；The switch
Pipe S4, the switching tube S8And the switching tube S12The end S connected with DC power cathode；The switching tube S3, the switch
Pipe S7And the switching tube S11The end S connected with the capacitor midpoint O point；The switching tube S2, the switching tube S6And it is described
Switching tube S10The end D respectively with the switching tube S3, the switching tube S7And the switching tube S11The end D connection；
The switching tube S1The end S, the switching tube S2The end S and the switching tube S4The end D and the inductance LaOne
End is connected；
The switching tube S5The end S, the switching tube S6The end S and the switching tube S8The end D and the inductance LbOne
End is connected；
The switching tube S9The end S, the switching tube S10The end S and the switching tube S12The end D and the inductance Lc's
One end is connected.
4. any one of -3 a kind of three level grid-connected converter topology of midpoint self-balancing according to claim 1, which is characterized in that
The inductance La, the inductance Lb, the inductance Lc, the inductance Lga, the inductance Lgb, the inductance LgcWith the capacitor
Ca, the capacitor Cb, the capacitor CcConstitute LCL filter.
5. any one of -3 a kind of three level grid-connected converter topology of midpoint self-balancing according to claim 1, which is characterized in that
The capacitor CrParameter selection meets:
X=a, b, c
Wherein, ωcFor carrier angular frequencies.
6. any one of -3 a kind of three level grid-connected converter topology of midpoint self-balancing according to claim 1, which is characterized in that
When the switching tube used is the insulated gate bipolar transistor with anti-paralleled diode, the end D of switching tube is collector, switch
The end S of pipe is emitter；
When the switching tube used is metal oxide layer semiconductor field effect transistor, the end D of switching tube is drain electrode, switching tube
The end S is source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910367974.6A CN110086365B (en) | 2019-05-05 | 2019-05-05 | Neutral point self-balancing three-level grid-connected converter topology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910367974.6A CN110086365B (en) | 2019-05-05 | 2019-05-05 | Neutral point self-balancing three-level grid-connected converter topology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110086365A true CN110086365A (en) | 2019-08-02 |
| CN110086365B CN110086365B (en) | 2020-07-28 |
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| CN201910367974.6A Active CN110086365B (en) | 2019-05-05 | 2019-05-05 | Neutral point self-balancing three-level grid-connected converter topology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262462A (en) * | 2020-03-04 | 2020-06-09 | 科华恒盛股份有限公司 | Filter capacitor failure detection method of inverter |
| WO2024040355A1 (en) * | 2022-08-25 | 2024-02-29 | Eleappower Ltd. | Grid connected converter device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738826A (en) * | 2012-06-11 | 2012-10-17 | 合肥工业大学 | Leakage current restraining method for improved LCL (Lower Control Limit) filter and even balance control method |
| US20130044526A1 (en) * | 2011-05-17 | 2013-02-21 | Samir Soua | 2n+1 level voltage inverter |
| CN103825474A (en) * | 2012-11-16 | 2014-05-28 | 台达电子工业股份有限公司 | Power conversion device with low common-mode noise and application system thereof |
| CN104065291A (en) * | 2014-05-23 | 2014-09-24 | 南京理工大学 | System and method for controlling neutral point voltage balance with low frequency oscillation suppression function |
| JP2016530858A (en) * | 2013-06-28 | 2016-09-29 | ビーワイディー カンパニー リミテッド | Electric vehicle charging control system and electric vehicle |
-
2019
- 2019-05-05 CN CN201910367974.6A patent/CN110086365B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130044526A1 (en) * | 2011-05-17 | 2013-02-21 | Samir Soua | 2n+1 level voltage inverter |
| CN102738826A (en) * | 2012-06-11 | 2012-10-17 | 合肥工业大学 | Leakage current restraining method for improved LCL (Lower Control Limit) filter and even balance control method |
| CN103825474A (en) * | 2012-11-16 | 2014-05-28 | 台达电子工业股份有限公司 | Power conversion device with low common-mode noise and application system thereof |
| JP2016530858A (en) * | 2013-06-28 | 2016-09-29 | ビーワイディー カンパニー リミテッド | Electric vehicle charging control system and electric vehicle |
| CN104065291A (en) * | 2014-05-23 | 2014-09-24 | 南京理工大学 | System and method for controlling neutral point voltage balance with low frequency oscillation suppression function |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262462A (en) * | 2020-03-04 | 2020-06-09 | 科华恒盛股份有限公司 | Filter capacitor failure detection method of inverter |
| WO2024040355A1 (en) * | 2022-08-25 | 2024-02-29 | Eleappower Ltd. | Grid connected converter device |
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