CN107482943B - A kind of equalizer circuit of multi-level converter DC capacitor group - Google Patents
A kind of equalizer circuit of multi-level converter DC capacitor group Download PDFInfo
- Publication number
- CN107482943B CN107482943B CN201710532777.6A CN201710532777A CN107482943B CN 107482943 B CN107482943 B CN 107482943B CN 201710532777 A CN201710532777 A CN 201710532777A CN 107482943 B CN107482943 B CN 107482943B
- Authority
- CN
- China
- Prior art keywords
- current
- equalizer circuit
- voltage
- capacitor
- circuit unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
A kind of equalizer circuit of multi-level converter DC capacitor group, the exportable m level of multi-level converter, m >=3, DC capacitor group is by m-1 DC capacitor CiIn series, i=1,2 ..., m-1 configure m-2 equalizer circuit unit, realize the balance of voltage of the multiple DC capacitors of multi-level converter.Any two adjacent capacitor of DC capacitor group is connected with an equalizer circuit unit.According to the current direction of current-limiting inductance, when assisting equalizing capacitance voltage to be greater than its reference voltage, make that equalizing capacitance is assisted to discharge by current-limiting inductance to DC capacitor group；When assisting equalizing capacitance voltage to be less than its reference voltage, make DC capacitor group by current-limiting inductance to auxiliary equalizing capacitance charging, and then realize the voltage balancing control of DC capacitor group.Using the control algolithm for having overcurrent limitation capability proposed, which can guarantee the balance of voltage of multi-level converter DC capacitor group under any modulation ratio and power factor.
Description
Technical field
The present invention relates to a kind of voltage balancing device of multi-level converter DC capacitor group more particularly to a kind of diodes
The voltage balancing device of the DC capacitor group of clamper type multi-level converter.
Background technique
The DC capacitor group of multi-level NPC inverter is made of multiple concatenated DC capacitors, the direct current
The both ends of appearance group are connected with DC power supply, and the points of common connection between capacitor is suspension node, suspension node and multilevel
The clamp diode network of device is connected.The bridge arm of multi-level converter is by the device for power switching of multiple series connections and corresponding
Clamp diode network composition, the control terminal of device for power switching are connected with the control device of multi-level converter.Pass through control
Device changes the switch state of the device for power switching of bridge arm, can obtain dividing production through DC capacitor group in the output end of bridge arm
Raw multiple level values.
Due to the intrinsic asymmetry of the interior capacitance outside of multi-level NPC inverter DC capacitor group, so that
When transmitting active power between DC capacitor group and load, the voltage between DC capacitor can disequilibrium.This will lead to function
The voltage stress of rate switching device and clamp diode rises, output waveform quality declines, and threatens the more level of diode clamp bit-type
The safe operation of converter.Based on the method for equalizing voltage for improving modulation algorithm, multi-level NPC inverter tune can be reduced
The freedom degree of system and control, and cannot guarantee reliably to press under any modulation ratio and loading condition.It introduces and appropriate presses
Circuit can be diode clamp under the premise of keeping multi-level NPC inverter modulation and control freedom degree
Type multi-level converter provides safe and reliable balance of voltage ability.
Document [1] (Akagi H, Fujita H, Yonetani S, et al.A6.6-kV transformerless
STATCOM based on a five-level diode-clamped PWM converter:System design and
experimentation of a 200-V 10-kVA laboratory model[J].IEEE Transactions on
Industry applications, 2008,44 (2): 672-680.) propose that how electric one kind is for five level diode clamp bit-types
The equalizer circuit of flat converter realizes the balance of voltage of DC capacitor group.The equalizer circuit is completely identical in structure equal by two
Volt circuit unit composition.Each equalizer circuit unit is based on H half-bridge, realizes two adjacent DC capacitors by an energy storage inductor
Energy transmission between device, and then realize the balance of voltage of two adjacent direct current capacitors.The shortcomings that circuit are as follows: (1) press
Device for power switching needs in circuit unit are used in series, to bear high voltage；(2) voltage stress at energy storage inductor both ends
Greatly, it is therefore desirable to which biggish energy storage inductor is set, to limit the change rate of energy storage inductor electric current.
For the voltage stress of the equalizer circuit cell power switching device of the above-mentioned document [1] of reduction, document [2] (Shukla
A,Ghosh A,Joshi A.Flying-capacitor-based chopper circuit for DC capacitor
voltage balancing in diode-clamped multilevel inverter[J].IEEE transactions
On industrial electronics, 2010,57 (7): 2249-2261.) in each equalizer circuit unit introduce one
A flying capacitor.But similar with document [1] circuit, which is still to be realized between DC capacitor by energy storage inductor
Energy transmission, disadvantage are as follows: (1) introducing of flying capacitor is mainly used for the voltage stress of equal power switching device；(2) direct current
The balance of voltage of capacitor is still to transmit energy by the energy storage inductor in equalizer circuit unit to realize, the introducing of flying capacitor
Increase the volume and weight of system；(3) after flying capacitor introduces, the voltage stress of the inductance element in equalizer circuit unit is still
For a quarter of DC bus-bar voltage, therefore there is still a need for biggish energy storage inductor is arranged, to limit energy storage inductor electric current
Change rate.
Summary of the invention
The purpose of the present invention is overcoming the prior art, a kind of pressure of multi-level converter DC capacitor group is proposed
Circuit.
The technical solution adopted by the present invention is that:
A kind of equalizer circuit of multi-level converter DC capacitor group, the exportable m level of the multi-level converter,
m≥3.Its DC capacitor group is by m-1 DC capacitor CiIt is in series, i=1,2 ..., m-1.Configure m-2 equalizer circuit list
Member realizes the balance of voltage of the multiple DC capacitors of multi-level converter.Any two adjacent capacitor of DC capacitor group is with one
A equalizer circuit unit is connected.The control terminal of the device for power switching of all equalizer circuit units with the control of multi-level converter
Device processed is connected.Equalizer circuit proposed by the invention is particularly suitable for the straight of more level multi-level NPC inverters
The balance of voltage that galvanic electricity is held.
The concrete composition of the equalizer circuit unit is:
Two power switching device series constitute one group of switch pair, form an internal points of common connection；Two groups of switches pair
A power switch networks in series, form an intermediate node；
The internal points of common connection of two of two groups of switches pair is respectively connected to the auxiliary equalizing capacitance of equalizer circuit unit
Both ends；
The intermediate node of two groups of switches pair passes through the common node of current-limiting inductance and two adjacent DC capacitors being balanced
It is connected；
Two not common tie points of the end of two groups of switches pair, respectively with the end for two adjacent DC capacitors being balanced
Two tie points in portion are connected.
The working principle and control method of multi-level converter DC capacitor group equalizer circuit proposed by the present invention are as follows:
Voltage with the auxiliary equalizing capacitance of equalizer circuit unit is primary control target, according to the auxiliary of equalizer circuit unit
The voltage of equalizing capacitance and the electric current of current-limiting inductance are helped, by the control device of the multi-level converter, determines each equal piezoelectricity
The switch state of the device for power switching of road unit, so that auxiliary is equal when assisting equalizing capacitance voltage to be greater than its reference voltage
Voltage capacitance is discharged by current-limiting inductance to DC capacitor group；When assisting equalizing capacitance voltage to be less than its reference voltage, direct current
Appearance group is charged by current-limiting inductance to auxiliary equalizing capacitance, and then is realized DC capacitor group and assisted the balance of voltage of equalizing capacitance
Control.
Specifically, the DC capacitor for defining DC bus side of the positive electrode that equalizer circuit unit is connected, close is known as
Capacitor is known as lower capacitor close to the DC capacitor of DC bus negative side, and according to power switch in each equalizer circuit unit
From the near to the distant, by four device for power switching, successively referred to as first switch device, second are opened for device and DC bus anode distance
Close device, third switching device and the 4th switching device, then:
(1) when the electric current of current-limiting inductance flows into DC capacitor group: if the voltage of auxiliary equalizing capacitance is greater than it with reference to electricity
Pressure, then be arranged by the control device of multi-level converter the power switch networks of equalizer circuit unit first switch device and
The shutdown of third switching device, second switch device and the 4th switching device are open-minded, so that auxiliary equalizing capacitance passes through current-limiting inductance
Downward capacitor electric discharge；If the voltage of equalizing capacitance is assisted to be less than its reference voltage, pass through the control device of multi-level converter
The first switch device and third switching device that the power switch networks of equalizer circuit unit are arranged open, second switch device and
4th switching device shutdown, so that upper capacitor is charged by current-limiting inductance to auxiliary equalizing capacitance；
(2) when the electric current of current-limiting inductance flows out DC capacitor group: if the voltage of auxiliary equalizing capacitance is greater than it with reference to electricity
Pressure, then be arranged by the control device of multi-level converter the power switch networks of equalizer circuit unit first switch device and
Third switching device is opened, second switch device and the 4th switching device turn off, so that auxiliary equalizing capacitance passes through current-limiting inductance
Upward capacitor electric discharge；If the voltage of equalizing capacitance is assisted to be less than its reference voltage, pass through the control device of multi-level converter
Be arranged the power switch networks of equalizer circuit unit first switch device and third switching device shutdown, second switch device and
4th switching device is open-minded, so that lower capacitor is charged by current-limiting inductance to auxiliary equalizing capacitance.
When the electric current of the current-limiting inductance detected is more than safety value, by the control device of multi-level converter, close
All device for power switching of corresponding equalizer circuit unit, by the restriction of current of current-limiting inductance in safety value.
Compared with prior art, the beneficial effects of the present invention are:
One, the balance of voltage of the DC capacitor group of multi-level converter, maximum journey are realized by the equalizer circuit proposed
Degree remains the freedom degree of multi-level converter modulation and control；
Two, provided equalizer circuit can guarantee that how electric diode clamp bit-type is under any modulation ratio and loading condition
The balance of voltage of flat converter DC capacitor group extends the pressure operation area of multi-level NPC inverter；
Three, auxiliary equalizing capacitance substantially reduces the voltage stress of current-limiting inductance as main energy transmission device, because
This no setting is required big inductance limits the change rate of inductive current, is conducive to the power density of raising system.
Four, DC capacitor is limited using current-limiting inductance and assists the discharge current between equalizing capacitance, compared to use
Current-limiting resistance can reduce the power loss of equalizer circuit, improve the efficiency of system.
Detailed description of the invention
Fig. 1 is circuit diagram of the present invention for the multi-level NPC inverter of p phase m level；
Fig. 2 is the circuit diagram that the present invention is used for 3 phase, 4 level multi-level NPC inverter；
Fig. 3 is 6 kinds of typical mode of operation of third equalizer circuit unit 31；
Wherein: the operating mode 1 of Fig. 3 a third equalizer circuit unit, the operating mode 2 of Fig. 3 b third equalizer circuit unit,
The operating mode 3 of Fig. 3 c third equalizer circuit unit, the operating mode 4 of Fig. 3 d third equalizer circuit unit, Fig. 3 e third are pressed
The operating mode 5 of circuit unit, the operating mode 6 of Fig. 3 f third equalizer circuit unit.
Fig. 4 is the control method for having the equalizer circuit unit of current-limiting inductance overcurrent limitation capability；
In figure: 11 first equalizer circuit units, 12 second equalizer circuit units, 21 diode clamp bit-type m level converters
Bridge 1 arm, 22 diode clamp bit-type m level converter Bridge 2 arms, 2p diode clamp bit-type m level converter pth bridge arm, 31
Third equalizer circuit unit, 32 the 4th equalizer circuit units, 41 diode clamp bit-type, 4 level converter Bridge 1 arm, 42 diodes
4 level converter Bridge 2 arm of clamper type, the 3rd bridge arm of 43 diode clamp bit-type, 4 level converter.
Specific embodiment
The equalizer circuit of multi-level converter DC capacitor group proposed by the present invention is used for p phase m level diode clamp bit-type
The circuit diagram of multi-level converter is as shown in Figure 1.The direct current of the multi-level NPC inverter of p phase m level
Appearance group is by m-1 DC capacitor CiIt is composed in series, i=1,2 ..., m-1, configures m-2 group equalizer circuit unit, realize more level
The balance of voltage of the multiple DC capacitors of converter.The adjacent DC capacitor of any two of DC capacitor group with an equal piezoelectricity
Road unit is connected.The control terminal of each device for power switching of m-2 equalizer circuit unit with the control of multi-level converter
Device is connected.
As shown in Fig. 2, a kind of specific embodiment of the invention is: a kind of pressure of 4 level converter DC capacitor groups
Circuit, the balance control of the DC capacitor voltage for 3 phase, 4 level multi-level NPC inverter.4 level diodes
The DC capacitor group of clamper type multi-level converter is by three DC capacitor C1, C2And C3It is composed in series, configures two equalizer circuits
Unit.Two adjacent capacitor C1And C2It is connected to third equalizer circuit unit；Adjacent capacitor C2And C3It is connected to the 4th equal piezoelectricity
Road unit.The control terminal of each device for power switching of two equalizer circuit units with the control device phase of multi-level converter
Even.
The topological structure of third equalizer circuit unit and the 4th equalizer circuit unit is identical with working principle.Below with current limliting
Inductance LB1For the third equalizer circuit unit at place, the composition and working principle of equalizer circuit unit are illustrated.
Third equalizer circuit unit is by power switch networks, current-limiting inductance LB1With auxiliary equalizing capacitance CB1Composition.Wherein function
Rate switching device SB11And SB12One group of switch pair in series forms an internal points of common connection B1N2；Device for power switching
SB13And SB14One group of switch pair in series forms an internal points of common connection B1N3.Two groups of switches are to a function in series
Rate switching network forms an intermediate node B1M。
The internal points of common connection B of two of two groups of switches pair1N2And B1N3, it is respectively connected to the auxiliary of third equalizer circuit unit
Help equalizing capacitance CB1Both ends.
The intermediate node B of two groups of switches pair1M, pass through current-limiting inductance LB1With two adjacent DC capacitor C being balanced1And C2
Common node N2It is connected.
The not common tie point B of two of the end of two groups of switches pair1N1And B1N4, respectively with two adjacent direct currents being balanced
Capacitor C1And C2End two tie point N1And N3It is connected.
Using the above-mentioned equalizer circuit of the present embodiment, to the direct current of 3 phase, 4 level multi-level NPC inverter
Hold voltage and is balanced control.The principle of third equalizer circuit unit control method is, to assist equalizing capacitance CB1Voltage be
Primary control target, according to auxiliary equalizing capacitance CB1Voltage and current-limiting inductance LB1Electric current, pass through 3 phase, 4 level two
The control device of pole pipe clamper type multi-level converter, determines the switch shape of device for power switching in third equalizer circuit unit
State, so that as auxiliary equalizing capacitance CB1Voltage be greater than its reference voltage when, assist equalizing capacitance CB1Pass through current-limiting inductance LB1To
The electric discharge of DC capacitor group；As auxiliary equalizing capacitance CB1Voltage be less than its reference voltage when, DC capacitor group passes through current-limiting inductance
LB1To auxiliary equalizing capacitance CB1Charging, and then realize DC capacitor group and auxiliary equalizing capacitance CB1The balance of voltage.
A kind of specific control method of the present embodiment is:
Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d, Fig. 3 e and Fig. 3 f show current-limiting inductance LB1The third equalizer circuit unit at place
6 kinds of typical mode of operation, wherein device for power switching SB11And SB13Switch state it is identical, SB12And SB14Switch state phase
Together, adjacent device for power switching is not open-minded simultaneously.In operating mode 1 and operating mode 2, energy is in DC capacitor C1And auxiliary
Equalizing capacitance CB1Between flow；In operating mode 3 and operating mode 4, energy is in DC capacitor C2With auxiliary equalizing capacitance CB1It
Between flow；In operating mode 5, energy is in DC capacitor C2With current-limiting inductance LB1Between flow；In operating mode 6, energy is straight
Galvanic electricity holds C1With current-limiting inductance LB1Between flow.
In Fig. 3, for operating mode 1 to operating mode 4, current-limiting inductance LB1The voltage at both ends be corresponding DC capacitor with
Assist equalizing capacitance CB1Difference in voltage, current-limiting inductance LB1Current changing rate it is smaller；In operating mode 5 and operating mode 6,
Current-limiting inductance LB1The voltage at both ends is the voltage of corresponding DC capacitor, current-limiting inductance LB1Current changing rate it is big.For this purpose, according to
6 kinds of operating modes shown in Fig. 3, devise and have current-limiting inductance LB1The equalizer circuit control method of overcurrent limitation capability.
Fig. 4 show proposed by the invention having and limits current-limiting inductance overcurrent capability, current-limiting inductance LB1Place
The control method of third equalizer circuit unit, to assist equalizing capacitance CB1Voltage be primary control target, according to sampling
The auxiliary equalizing capacitance C arrivedB1Voltage and current-limiting inductance LB1Electric current, it is more by 3 phase, the 4 level diode clamp bit-type
The control device of level converter determines the device for power switching S of third equalizer circuit unitB11, SB12, SB13And SB14Switch
State so that third equalizer circuit unit switches in operating mode 1 between operating mode 6, and then finally realizes DC capacitor
C1, C2And C3And auxiliary equalizing capacitance CB1Voltage balancing control.
Specifically, defining the DC capacitor C of the close DC bus side of the positive electrode of third equalizer circuit unit connection1It is upper
Capacitor, close to the DC capacitor C of DC bus negative side2For lower capacitor, and according to power switch in third equalizer circuit unit
Four device for power switching from the near to the distant, are successively known as first switch device S by device and DC bus anode distanceB11, second
Switching device SB12, third switching device SB13With the 4th switching device SB14.The control method include two working condition ST1 and
ST2, respectively normal operating conditions ST1 and current limliting working condition ST2.As current-limiting inductance LB1Electric current iLB1Within safety value
When, third equalizer circuit cell operation is in normal operating conditions ST1.
The working principle of normal operating conditions ST1 is:
(1) as current-limiting inductance LB1Electric current flow into DC capacitor group when: if auxiliary equalizing capacitance CB1Voltage greater than its ginseng
Voltage is examined, then first that the power switch networks of third equalizer circuit unit are arranged by the control device of multi-level converter opens
Close device SB11With third switching device SB13Shutdown, second switch device SB12With the 4th switching device SB14It is open-minded, so that auxiliary
Equalizing capacitance CB1Pass through current-limiting inductance LB1Downward capacitor C2Electric discharge；If assisting equalizing capacitance CB1Voltage be less than its reference voltage,
The first switch device of the power switch networks of third equalizer circuit unit is then set by the control device of multi-level converter
SB11With third switching device SB13It opens, second switch device SB12With the 4th switching device SB14Shutdown, so that upper capacitor C1It is logical
Cross current-limiting inductance LB1To auxiliary equalizing capacitance CB1Charging；
(2) as current-limiting inductance LB1Electric current flow out DC capacitor group when: if auxiliary equalizing capacitance CB1Voltage greater than its ginseng
Voltage is examined, then first that the power switch networks of third equalizer circuit unit are arranged by the control device of multi-level converter opens
Close device SB11With third switching device SB13It opens, second switch device SB12With the 4th switching device SB14Shutdown, so that auxiliary
Equalizing capacitance CB1Pass through current-limiting inductance LB1Upward capacitor C1Electric discharge；If assisting equalizing capacitance CB1Voltage be less than its reference voltage,
The first switch device of the power switch networks of third equalizer circuit unit is then set by the control device of multi-level converter
SB11With third switching device SB13Shutdown, second switch device SB12With the 4th switching device SB14It is open-minded, so that lower capacitor C2It is logical
Cross current-limiting inductance LB1To auxiliary equalizing capacitance CB1Charging.
When detecting current-limiting inductance LB1Electric current iLB1More than safety value iLTHWhen, by closing third equalizer circuit unit
All device for power switching SB11, SB12, SB13And SB14, make third equalizer circuit cell operation in current limliting working condition ST2, in turn
By current-limiting inductance LB1Restriction of current in safety value.As current-limiting inductance LB1Electric current be reduced to 0 after, third equalizer circuit list
Member returns to normal operating conditions ST1 and works on.Equalizer circuit control method shown in Fig. 4, ensure that equalizer circuit of the present invention
Safe operation.
Claims (3)
1. a kind of equalizer circuit of multi-level converter DC capacitor group, the multi-level converter can export m level,
M >=3, DC capacitor group is by m-1 DC capacitor CiIt is in series, i=1,2 ..., m-1；The equalizer circuit configures m-2
A equalizer circuit unit realizes the balance of voltage of the multiple DC capacitors of multi-level converter；Any two phase of DC capacitor group
Adjacent capacitor is connected with an equalizer circuit unit；It is characterized by: the equalizer circuit unit is by auxiliary equalizing capacitance, current limliting
Inductance and four set of power switches are at auxiliary equalizing capacitance is not connected directly with current-limiting inductance；All equalizer circuit units
The control terminal of device for power switching be connected with the control device of multi-level converter；
The concrete composition of the equalizer circuit unit is:
Two power switching device series constitute one group of switch pair, form an internal points of common connection；Two groups of switches are to series connection
A power switch networks are constituted, an intermediate node is formed；
The internal points of common connection of two of two groups of switches pair is respectively connected to the two of the auxiliary equalizing capacitance of equalizer circuit unit
End；
The intermediate node of two groups of switches pair passes through the common node phase of current-limiting inductance and two adjacent DC capacitors being balanced
Even；
Two not common tie points of the end of two groups of switches pair, respectively with the end for two adjacent DC capacitors being balanced
Two tie points are connected；
When current-limiting inductance electric current is when within permissible value, auxiliary equalizing capacitance, current-limiting inductance and corresponding DC capacitor CiPass through two
Device for power switching forming circuit, the voltage at current-limiting inductance both ends are flying capacitor voltage and corresponding DC capacitor difference in voltage；
When current-limiting inductance electric current is more than permissible value, current-limiting inductance and corresponding DC capacitor CiIt is formed back by two device for power switching
Road, the voltage at current-limiting inductance both ends are the voltage of corresponding DC capacitor.
2. the equalizer circuit of multi-level converter DC capacitor group according to claim 1, it is characterised in that: with described
The voltage of the auxiliary equalizing capacitance of equalizer circuit unit is primary control target；According to the auxiliary equalizing capacitance of equalizer circuit unit
Voltage and the electric current of current-limiting inductance the function of each equalizer circuit unit is determined by the control device of the multi-level converter
The switch state of rate switching device, so that auxiliary equalizing capacitance passes through when assisting equalizing capacitance voltage to be greater than its reference voltage
Current-limiting inductance is discharged to DC capacitor group；When assisting equalizing capacitance voltage to be less than its reference voltage, DC capacitor group passes through limit
Galvanic electricity sense realizes DC capacitor group and assists the voltage balancing control of equalizing capacitance to auxiliary equalizing capacitance charging.
3. the equalizer circuit of multi-level converter DC capacitor group according to claim 1, it is characterised in that: when detecting
The electric current of current-limiting inductance when being more than safety value, by closing all device for power switching of corresponding equalizer circuit unit, will limit
The restriction of current of galvanic electricity sense is within safety value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532777.6A CN107482943B (en) | 2017-07-03 | 2017-07-03 | A kind of equalizer circuit of multi-level converter DC capacitor group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532777.6A CN107482943B (en) | 2017-07-03 | 2017-07-03 | A kind of equalizer circuit of multi-level converter DC capacitor group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107482943A CN107482943A (en) | 2017-12-15 |
| CN107482943B true CN107482943B (en) | 2019-07-30 |
Family
ID=60595319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710532777.6A Active CN107482943B (en) | 2017-07-03 | 2017-07-03 | A kind of equalizer circuit of multi-level converter DC capacitor group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107482943B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4071990A4 (en) * | 2019-12-24 | 2023-01-11 | Huawei Digital Power Technologies Co., Ltd. | Conversion circuit and related electronic device |
| CN114342236A (en) * | 2020-07-29 | 2022-04-12 | 华为数字能源技术有限公司 | Conversion circuit and related electronic device |
| CN115842537B (en) * | 2023-02-20 | 2023-06-13 | 杭州铂科电子有限公司 | Series voltage equalizing circuit of switching device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188385A (en) * | 2007-11-21 | 2008-05-28 | 山东新风光电子科技发展有限公司 | A five-level high-voltage frequency converter |
| CN201118461Y (en) * | 2007-10-10 | 2008-09-17 | 山东新风光电子科技发展有限公司 | A dynamic voltage balance circuit for five-level commutator |
| GB2451138A (en) * | 2007-07-20 | 2009-01-21 | Frazer Nash Technology Ltd | Battery cell charge balancing system |
| CN101764422A (en) * | 2010-01-15 | 2010-06-30 | 浙江大学 | Equalizer circuit for series-connection charge-discharge unit |
| CN102244477A (en) * | 2011-07-07 | 2011-11-16 | 西南交通大学 | Multi-level converter with DC (direct current) capacitor assisted voltage-sharing circuit |
| CN102255547A (en) * | 2011-07-17 | 2011-11-23 | 西南交通大学 | Voltage-sharing control circuit of diode-clamped multilevel converter DC (direct current) capacitor and voltage-sharing control method thereof |
| CN102291007A (en) * | 2011-06-17 | 2011-12-21 | 西南交通大学 | Cophase power supply system for cascade output-free transformer |
| CN103236786A (en) * | 2013-04-17 | 2013-08-07 | 华为技术有限公司 | Voltage-sharing circuit and inverter |
-
2017
- 2017-07-03 CN CN201710532777.6A patent/CN107482943B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2451138A (en) * | 2007-07-20 | 2009-01-21 | Frazer Nash Technology Ltd | Battery cell charge balancing system |
| CN201118461Y (en) * | 2007-10-10 | 2008-09-17 | 山东新风光电子科技发展有限公司 | A dynamic voltage balance circuit for five-level commutator |
| CN101188385A (en) * | 2007-11-21 | 2008-05-28 | 山东新风光电子科技发展有限公司 | A five-level high-voltage frequency converter |
| CN101764422A (en) * | 2010-01-15 | 2010-06-30 | 浙江大学 | Equalizer circuit for series-connection charge-discharge unit |
| CN102291007A (en) * | 2011-06-17 | 2011-12-21 | 西南交通大学 | Cophase power supply system for cascade output-free transformer |
| CN102244477A (en) * | 2011-07-07 | 2011-11-16 | 西南交通大学 | Multi-level converter with DC (direct current) capacitor assisted voltage-sharing circuit |
| CN102255547A (en) * | 2011-07-17 | 2011-11-23 | 西南交通大学 | Voltage-sharing control circuit of diode-clamped multilevel converter DC (direct current) capacitor and voltage-sharing control method thereof |
| CN103236786A (en) * | 2013-04-17 | 2013-08-07 | 华为技术有限公司 | Voltage-sharing circuit and inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107482943A (en) | 2017-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104578865B (en) | A kind of T-shaped fault-tolerant current transformer of three level four bridge legs and its control method | |
| CN108475999B (en) | Single-phase five-level active clamping converter unit and converter | |
| CN207234419U (en) | Looped network of DC power framework based on multiport residents energy source router | |
| CN102714471B (en) | For to the current transformer of charging accumulator and electric discharge and the submodule of current transformer | |
| CN107482943B (en) | A kind of equalizer circuit of multi-level converter DC capacitor group | |
| CN105305855B (en) | Three-phase isolation type bidirectional AC-DC converter and its control method | |
| CN103956802A (en) | Switch matrix and LC resonant transformation based cells to cells equalization circuit and method | |
| CN104821736A (en) | Modularized multi-level converter with function of DC side short circuit protection | |
| CN203840033U (en) | Cells to cells equalization circuit based on switch matrix and LC resonant conversion | |
| CN106452147B (en) | A kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical | |
| CN102075107B (en) | Main circuit of three-phase four-wire DC/AC convertor and control method thereof | |
| CN102185487A (en) | Mixed cascading type multilevel stored energy charging-discharging and voltage-equalizing circuit | |
| CN107959433A (en) | A kind of inverter and inversion system for suppressing leakage current | |
| CN103236710A (en) | Unified power flow controller in modular structure | |
| CN103066587A (en) | Optimal configuration method of modular multi-level flexible direct current system | |
| CN103701345A (en) | Five-level inverter | |
| CN103201926A (en) | Electrical power supply device for a nonlinear, temporally varying load | |
| CN101764422A (en) | Equalizer circuit for series-connection charge-discharge unit | |
| CN106230079B (en) | Split-phase type low-power consumption energy accumulation current converter and its control method and control system | |
| CN104410136A (en) | Interlaced modular Pack to Cell equalizer circuit and control method | |
| EP3157120B1 (en) | Modular multi-level flexible direct-current topology circuit suitable for fault ride-through | |
| CN103259436B (en) | Combination clamping type Five-level converter and control method thereof | |
| CN106100397B (en) | A kind of Modular multilevel converter | |
| CN205160403U (en) | Energy storage power converting system based on many level of modularization converter | |
| CN101577428B (en) | Single-phase module combined active power filter for tractive power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230619 Address after: 100190 No. 6 North of Zhongguancun, Haidian District, Haidian District, Beijing Patentee after: INSTITUTE OF ELECTRICAL ENGINEERING, CHINESE ACADEMY OF SCIENCES Patentee after: CRRC QINGDAO SIFANG Co.,Ltd. Address before: 100190 No. 6 North of Zhongguancun, Haidian District, Haidian District, Beijing Patentee before: INSTITUTE OF ELECTRICAL ENGINEERING, CHINESE ACADEMY OF SCIENCES |
|
| TR01 | Transfer of patent right |