CN110011317A - A kind of dynamic electric voltage recovery device based on soft switch circuit - Google Patents
A kind of dynamic electric voltage recovery device based on soft switch circuit Download PDFInfo
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- CN110011317A CN110011317A CN201910214709.4A CN201910214709A CN110011317A CN 110011317 A CN110011317 A CN 110011317A CN 201910214709 A CN201910214709 A CN 201910214709A CN 110011317 A CN110011317 A CN 110011317A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The present invention discloses a kind of dynamic electric voltage recovery device based on soft switch circuit, respectively constitutes A, B, C three-phase system including three groups of single-phase full bridge inverter bridge legs in parallel.The resonant branch of auxiliary switch of the access comprising anti-paralleled diode, clamping capacitance and resonant inductance composition between the DC bus and DC voltage source of three groups of full-bridge inverting bridge arms, the output of three groups of full-bridge inverting bridge arms pass through transformer series in three-phase distribution net after LC filter respectively.It is open-minded that the present invention by the movement of auxiliary circuit may be implemented all main switch no-voltages, realizes circuit gamut Sofe Switch in power frequency period.The invention effectively reduces switching loss caused by hard switching process and EMI interference, conducive to the power density for improving dynamic electric voltage recovery device.
Description
Technical field
The present invention relates to dynamic electric voltage recovery device field of circuit technology, and in particular to a kind of dynamic based on soft switch circuit
Voltage restorer topology and its modulator approach.
Background technique
Currently, partial dynamic voltage restorer topology is as shown in Figure 1 comprising by anti-paralleled diode (Da1、Da2) it is complete
Control type main switch (Sa1、Sa2) the first bridge arm is constituted, by anti-paralleled diode (Da3、Da4) full-control type main switch (Sa3、Sa4) structure
At the second bridge arm, by anti-paralleled diode (Db1、Db2) full-control type main switch (Sb1、Sb2) third bridge arm is constituted, by inverse parallel two
Pole pipe (Db3、Db4) full-control type main switch (Sb3、Sb4) four bridge legs are constituted, by anti-paralleled diode (Dc1、Dc2) full-control type
Main switch (Sc1、Sc2) third bridge arm is constituted, by anti-paralleled diode (Dc3、Dc4) full-control type main switch (Sc3、Sc4) constitute the
Four bridge legs, DC source (Udc) be connected in parallel on same DC bus with above-mentioned all bridge arms, the bridge of the first bridge arm and the second bridge arm
Filter inductance L is passed through at arm midpoint1, filter capacitor C1The LC filter of composition is connected with the low-pressure side of transformer A phase winding, third
Filter inductance L is passed through at the bridge arm midpoint of bridge arm and four bridge legs2, filter capacitor C2The LC filter and transformer B phase winding of composition
Low-pressure side be connected, filter inductance L is passed through at the bridge arm midpoint of the 5th bridge arm and the 6th bridge arm3, filter capacitor C3The LC of composition is filtered
Device is connected with the low-pressure side of transformer C phase winding.The high-pressure side of three-phase transformer is connected on three-phase distribution net and load respectively
Between.Since above-mentioned full-controlled switch all works in hard switching state, all there is reverse recovery phenomena in anti-paralleled diode, make
It is big at the switching loss of full-controlled switch, voltage and current stress is big, dynamic electric voltage recovery device working frequency is low, EMI interference is big, function
The problems such as rate density is low.
Summary of the invention
The object of the present invention is to provide a kind of reduction switching losses, improve the dynamic based on soft switch circuit of circuit efficiency
Voltage restorer topology and its modulator approach.
The one aspect of the content of present invention provides a kind of dynamic electric voltage recovery device based on soft switch circuit, including by two
A band parallel resonance capacitor (Ca1、Ca2) and anti-paralleled diode (Da1、Da2) full-control type main switch (Sa1、Sa2) constitute the first bridge
Arm, by two band parallel resonance capacitor (Ca3、Ca4) and anti-paralleled diode (Da3、Da4) full-control type main switch (Sa3、 Sa4) structure
At the second bridge arm, by two band parallel resonance capacitor (Cb1、Cb2) and anti-paralleled diode (Db1、Db2) full-control type main switch
(Sb1、Sb2) third bridge arm is constituted, by two band parallel resonance capacitor (Cb3、Cb4) and anti-paralleled diode (Db3、Db4) full control
Type main switch (Sb3、Sb4) four bridge legs are constituted, by two band parallel resonance capacitor (Cc1、Cc2) and anti-paralleled diode (Dc1、
Dc2) full-control type main switch (Sb1、Sb2) the 5th bridge arm is constituted, by two band parallel resonance capacitor (Cc3、Cc4) and inverse parallel two
Pole pipe (Dc3、Dc4) full-control type main switch (Sc3、Sc4) the 6th bridge arm is constituted, by resonant inductance (Lr) one in parallel by parallel humorous
Shake capacitor (Ca) and anti-paralleled diode (Da) full-control type auxiliary switch (Sa) cascoded clamp capacitor (Cc) circuit constitute
Auxiliary circuit；DC source (Udc) be connected in parallel on same DC bus by auxiliary circuit and above-mentioned all bridge arms, the first bridge
Filter inductance L is passed through at the bridge arm midpoint of arm and the second bridge arm1, filter capacitor C1The LC filter of composition and transformer A phase winding
Low-pressure side is connected, and filter inductance L is passed through at the bridge arm midpoint of third bridge arm and four bridge legs2, filter capacitor C2The LC filter of composition
It is connected with the low-pressure side of transformer B phase winding, filter inductance L is passed through at the bridge arm midpoint of the 5th bridge arm and the 6th bridge arm3, filtered electrical
Hold C3The LC filter of composition is connected with the low-pressure side of transformer C phase winding；The high-pressure side of three-phase transformer is connected on three respectively
Between phase power distribution network and load.
The other side of the content of present invention provides a kind of tune of dynamic electric voltage recovery device circuit based on soft switch circuit
Method processed, the first bridge arm full-control type main switch (Sa1、Sa2), the second bridge arm full-control type main switch (Sa3、Sa4), third bridge arm
Full-control type main switch (Sb1、Sb2), four bridge legs full-control type main switch (Sb3、Sb4), the 5th bridge arm full-control type main switch (Sc1、
Sc2), the 6th bridge arm full-control type main switch (Sc3、Sc4) controlled using no-voltage sinusoidal pulse width modulation method；In each switch
In period, to present in above-mentioned six bridge arms from anti-paralleled diode to the switch motion moment of the full-control type main switch change of current into
Row synchronizes, while the full-control type auxiliary switch (S of auxiliary brancha) control signal and above-mentioned switch motion timing synchronization, i.e., in electricity
Full-control type auxiliary switch is turned off before flowing from the anti-paralleled diode of full-control type main switch to the full-control type main switch change of current moment
(Sa), to zero, the full-control type main switch for that will open provides no-voltage and opens condition resonance the voltage on DC bus immediately,
At the time of all bridge arms complete the change of current, according to DC source (Udc) flow of power situation decide whether be added bridge arm direct pass mistake
Journey；When power flow direction is to flow into DC source (Udc) when, it does not need that bridge arm direct pass process is added, above-mentioned all diodes are to full-control type
After main switch commutation course terminates, resonant capacitance CaOn voltage by resonance be zero, full-control type auxiliary switch SaCarry out no-voltage
It is open-minded；When power flows out DC source (Udc) when need to be added bridge arm direct pass process, at this time by above-mentioned full-control type main switch (Sa1
~Sa4、Sb1~Sb4、Sc1~Sc4) all turn on, it realizes to resonant inductance (Lr) fill can, completion is filled full-control type auxiliary after energy and is opened
Close (Sa) on voltage resonance is to zero immediately, for the full-control type auxiliary switch (S that will be openeda) provide no-voltage open condition.
Compared with prior art, the present invention have it is following the utility model has the advantages that
It is open-minded that the present invention by the shutdown of the auxiliary switch of auxiliary circuit may be implemented all main switch no-voltages, and
By the resonant inductance that bridgc arm short pulse is auxiliary circuit fill can, realize that gamut is soft in power frequency period in three-phase system
Switch.The invention effectively reduces switching loss caused by hard switching process, biggish voltage, current stress and EMI interference, benefit
In the power density for improving dynamic electric voltage recovery device.
Detailed description of the invention
Fig. 1 is conventional dynamic voltage restorer topology.
Fig. 2 is the dynamic electric voltage recovery device topology based on soft switch circuit.
Fig. 3 be the dynamic electric voltage recovery device based on soft switch circuit under three-phase ground failure in power frequency period according to filtering
Inductive current iLa、iLb、iLcSix regions divided with zero balancing.
Fig. 4~21 are respectively the work equivalent circuit in each stage of a switch periods of the invention in region 2.
Figure 22 is the groundwork voltage and current waveform of present invention switch periods in region 2.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.The present invention is described in detail with reference to the accompanying drawing.
Referring to Fig. 2, the dynamic electric voltage recovery device topology based on soft switch circuit includes by two band parallel resonance capacitors
(Ca1、Ca2) and anti-paralleled diode (Da1、Da2) full-control type main switch (Sa1、Sa2) the first bridge arm is constituted, it is in parallel by two bands
Resonant capacitance (Ca3、Ca4) and anti-paralleled diode (Da3、Da4) full-control type main switch (Sa3、Sa4) the second bridge arm is constituted, by two
A band parallel resonance capacitor (Cb1、Cb2) and anti-paralleled diode (Db1、Db2) full-control type main switch (Sb1、Sb2) constitute third
Bridge arm, by two band parallel resonance capacitor (Cb3、Cb4) and anti-paralleled diode (Db3、Db4) full-control type main switch (Sb3、Sb4)
Four bridge legs are constituted, by two band parallel resonance capacitor (Cc1、Cc2) and anti-paralleled diode (Dc1、Dc2) full-control type main switch
(Sb1、Sb2) the 5th bridge arm is constituted, by two band parallel resonance capacitor (Cc3、Cc4) and anti-paralleled diode (Dc3、Dc4) full control
Type main switch (Sc3、Sc4) the 6th bridge arm is constituted, by resonant inductance (Lr) one in parallel by parallel resonance capacitor (Ca) and inverse parallel
Diode (Da) full-control type auxiliary switch (Sa) cascoded clamp capacitor (Cc) circuit constitute auxiliary circuit；DC source (Udc)
It is connected in parallel on same DC bus by auxiliary circuit and above-mentioned all bridge arms, in the bridge arm of the first bridge arm and the second bridge arm
Point passes through filter inductance L1, filter capacitor C1The LC filter of composition is connected with the low-pressure side of transformer A phase winding, third bridge arm
Pass through filter inductance L with the bridge arm midpoint of four bridge legs2, filter capacitor C2The LC filter of composition is low with transformer B phase winding
Side is pressed to be connected, filter inductance L is passed through at the bridge arm midpoint of the 5th bridge arm and the 6th bridge arm3, filter capacitor C3The LC filter of composition with
The low-pressure side of transformer C phase winding is connected；The high-pressure side of three-phase transformer is connected on respectively between three-phase distribution net and load.
The modulator approach of dynamic electric voltage recovery device based on soft switch circuit, the first bridge arm full-control type main switch (Sa1、
Sa2), the second bridge arm full-control type main switch (Sa3、Sa4), third bridge arm full-control type main switch (Sb1、Sb2), four bridge legs full-control type
Main switch (Sb3、Sb4), the 5th bridge arm full-control type main switch (Sc1、Sc2), the 6th bridge arm full-control type main switch (Sc3、Sc4) use
No-voltage sinusoidal pulse width modulation method is controlled；In each switch periods, to present in above-mentioned six bridge arms by instead simultaneously
Union II pole pipe was synchronized to the switch motion moment of the full-control type main switch change of current, while the full-control type auxiliary switch of auxiliary branch
(Sa) control signal and above-mentioned switch motion timing synchronization, i.e., it is controlled from the anti-paralleled diode of full-control type main switch to complete in electric current
Full-control type auxiliary switch (S is turned off before the type main switch change of current momenta), resonance is to zero immediately for the voltage on DC bus, for i.e.
It provides the full-control type main switch opened to no-voltage and opens condition, at the time of all bridge arms complete the change of current, according to DC source
(Udc) flow of power situation decide whether be added bridge arm direct pass process；When power flow direction is to flow into DC source (Udc) when, it is not required to
Bridge arm direct pass process is added, after above-mentioned all diodes terminate to full-control type main switch commutation course, resonant capacitance CaOn
Voltage by resonance be zero, full-control type auxiliary switch SaIt is open-minded to carry out no-voltage；When power flows out DC source (Udc) when need plus
Enter bridge arm direct pass process, at this time by above-mentioned full-control type main switch (Sa1~Sa4、Sb1~Sb4、Sc1~Sc4) all turn on, it realizes
To resonant inductance (Lr) fill can, completion fill full-control type auxiliary switch (S after energya) on voltage resonance is to zero immediately, for that will open
Logical full-control type auxiliary switch (Sa) provide no-voltage open condition.
It can be according to its filter inductance L for the dynamic electric voltage recovery device based on soft switch circuit referring to Fig. 31、L2、L3
Electric current iLa、iLb、iLcWith zero size comparable situation, working region is divided into six regions.For filter inductance electric current iLa、
iLb、iLcIt is in for region 2, the course of work of the circuit work in a switch periods is analyzed.
Due in region 2, iLa、iLbGreater than zero, iLcLess than zero, there are six diodes to the mistake of the main switch change of current
Journey, respectively Da2To Sa1The change of current, Da3To Sa4The change of current, Db2To Sb1The change of current, Db3To Sb4The change of current, Dc1To Sc2The change of current, Dc4To Sc3It changes
Stream.
Fig. 4~21 are 18 work equivalent circuits of a switch periods in the region 2, the mains voltage and electricity of work
Stream waveform is as shown in figure 22, and the voltage and current reference direction of circuit is as shown in Figure 2.Circuit works in the course of work in other regions
It is similar.
Specific phase analysis is as follows:
One (t of stage0~t1):
As shown in figure 4, the main switch S of six groups of bridge armsa2、Sa3、Sb2、Sb3、Sc1、Sc4With auxiliary switch SaConducting, pincers
Position capacitor CcElectric discharge fills energy for resonant inductance.
Two (t of stage1~t2):
As shown in figure 5, the main switch S of six groups of bridge armsa2、Sa3、Sb2、Sb3、Sc1、Sc4Simultaneously turn off, six groups of bridge arms it is anti-
Parallel diode Da2、Da3、Db2、Db3、Dc1、Dc4Conducting, auxiliary switch SaContinue to be connected, clamping capacitance CcElectric discharge is resonance electricity
Energy is filled in sense.
Three (t of stage2~t3):
As shown in fig. 6, in t2Moment auxiliary switch SaShutdown, resonant inductance LrMake the main switch S of six groups of bridge armsa1、
Sa4、Sb1、Sb4、Sc2、Sc3Shunt capacitance Ca1、Ca4、Cb1、Cb4、Cc2、Cc3Electric discharge, while making auxiliary switch SaShunt capacitance
CaCharging, in t2Moment, the main switch S of six groups of bridge armsa1、Sa4、Sb1、Sb4、Sc2、Sc3Shunt capacitance Ca1、Ca4、Cb1、Cb4、
Cc2、Cc3Voltage resonance to zero, which terminates.
Four (t of stage3~t4):
As shown in fig. 7, in t3After moment, the anti-paralleled diode D of six groups of bridge armsa1、Da4、 Db1、Db4、Dc2、Dc3It leads
It is logical, by main switch Sa1、Sa4、Sb1、Sb4、Sc2、Sc3Voltage clamp zero.By main switch Sa1、Sa4、Sb1、Sb4、Sc2、Sc3
It is open-minded, realize main main switch Sa1、Sa4、Sb1、Sb4、Sc2、Sc3No-voltage it is open-minded, which terminates.
Five (t of stage4~t5):
As shown in figure 8, in main switch Sa1、Sa4、Sb1、Sb4、Sc2、Sc3After opening, bridge arm current starts the change of current, filtered electrical
Feel L1Electric current iLaBy diode Da2、Da3To main switch Sa1、Sa4The change of current, filter inductance L2Electric current iLbBy diode Db2、
Db3To main switch Sb1、Sb4The change of current, filter inductance L3Electric current iLcBy diode Dc1、Dc4To main switch Sc2、Sc3The change of current.?
t5Moment, above-mentioned commutation course are completed, which terminates.
Six (t of stage5~t6):
As shown in figure 9, in t5Moment opens all switching tube S of six groups of bridge armsa1~Sa4、Sb1~Sb4、 Sc1~Sc4.Electricity
Road bridgc arm short, DC voltage source UdcFor resonant inductance LrSupplement resonant energy.
Seven (t of stage6~t7):
As shown in Figure 10, in t6Moment, by the main switch S of six groups of bridge armsa2、Sa3、Sb2、 Sb3、Sc1、Sc4Shutdown, resonance
Inductance LrMake auxiliary switch SaShunt capacitance CaElectric discharge, while making main switch Sa2、Sa3、Sb2、Sb3、Sc1、Sc4Parallel connection electricity
Hold main switch Ca2、 Ca3、Cb2、Cb3、Cc1、Cc4Charging, in t7Moment, auxiliary switch SaShunt capacitance CaOn voltage
To zero, which terminates resonance.
Eight (t of stage7~t8):
As shown in figure 11, in t7After moment, auxiliary switch SaAnti-paralleled diode DaIt can be connected, by auxiliary switch
Pipe SaOn voltage clamp zero.By auxiliary switch SaIt is open-minded, realize auxiliary switch SaNo-voltage it is open-minded, the stage knot
Beam.
Nine (t of stage8~t9):
As shown in figure 12, auxiliary switch SaConducting, clamping capacitance CcBy resonant inductance LrVoltage clamp, resonant inductance electricity
Flow iLrWith UCc/LrRate linear rises.
Ten (t of stage9~t10):
As shown in figure 13, in t9Moment, the main switch S of the first bridge arm, the second bridge arma1、 Sa4Shutdown, shunt capacitance
Ca1、Ca4Charging, the S of the first bridge arm, the second bridge arma2、Sa3Shunt capacitance Ca2、Ca3Electric discharge, in t10Moment, shunt capacitance Ca1、
Ca4On voltage rise to UCc+Udc, and shunt capacitance Ca2、Ca3On voltage drop to zero, which terminates.
11 (t of stage10~t11):
As shown in figure 14, in t10Moment, the anti-paralleled diode D of the first bridge arm, the second bridge arma2、Da3Conducting, filtered electrical
Feel L1Electric current iLaIt completes by main switch Sa1、Sa4To diode Da2、Da3The change of current.
12 (t of stage11~t12):
As shown in figure 15, in t11Moment, by the first bridge arm, the main switch S of the second bridge arma2、 Sa3It is open-minded, inverse parallel
Diode Da2、Da3Electric current be transferred to main switch Sa2、Sa3。
13 (t of stage12~t13):
As shown in figure 16, in t12Moment, the main switch S of third bridge arm, four bridge legsb1、 Sb4Shutdown, shunt capacitance
Cb1、Cb4Charging, the S of the second bridge arm, third bridge armb2、Sb3Shunt capacitance Cb2、Cb3Electric discharge, in t13Moment, shunt capacitance Cb1、
Cb4On voltage rise to UCc+Udc, and shunt capacitance Cb2、Cb3On voltage drop to zero, which terminates.
14 (t of stage13~t14):
As shown in figure 17, in t13Moment, the anti-paralleled diode D of third bridge arm, four bridge legsb2、Db3Conducting, filtered electrical
Feel L2Electric current iLbIt completes by main switch Sb1、Sb4To diode Db2、Db3The change of current.
15 (t of stage14~t15):
As shown in figure 18, in t14Moment, by third bridge arm, the main switch S of four bridge legsb2、 Sb3It is open-minded, inverse parallel
Diode Db2、Db3Electric current be transferred to main switch Sb2、Sb3。
16 (t of stage15~t16):
As shown in figure 19, in t15Moment, the main switch S of the 5th bridge arm, the 6th bridge armc2、 Sc3Shutdown, shunt capacitance
Cc2、Cc3Charging, the S of the 5th bridge arm, the 6th bridge armc1、Sc4Shunt capacitance Cc1、Cc4Electric discharge, in t16Moment, shunt capacitance Cc2、
Cc3On voltage rise to UCc+Udc, and shunt capacitance Cc1、Cc4On voltage drop to zero, which terminates.
17 (t of stage16~t17):
As shown in figure 20, in t16Moment, the anti-paralleled diode D of the 5th bridge arm, the 6th bridge armc1、Dc4Conducting, filtered electrical
Feel L3Electric current iLcIt completes by main switch Sc2、Sc3To diode Dc1、Dc4The change of current.
18 (t of stage17~t0'):
As shown in figure 21, in t17Moment, by the 5th bridge arm, the main switch S of the 6th bridge armc1、 Sc4It is open-minded, inverse parallel
Diode Dc1、Dc4Electric current be transferred to main switch Sc1、Sc4。
Claims (2)
1. a kind of dynamic electric voltage recovery device based on soft switch circuit, it is characterised in that: the dynamic based on soft switch circuit
Voltage restorer circuit includes by two band parallel resonance capacitor (Ca1、Ca2) and anti-paralleled diode (Da1、Da2) full-control type master
Switch (Sa1、Sa2) the first bridge arm is constituted, by two band parallel resonance capacitor (Ca3、Ca4) and anti-paralleled diode (Da3、Da4)
Full-control type main switch (Sa3、Sa4) the second bridge arm is constituted, by two band parallel resonance capacitor (Cb1、Cb2) and anti-paralleled diode
(Db1、Db2) full-control type main switch (Sb1、Sb2) third bridge arm is constituted, by two band parallel resonance capacitor (Cb3、Cb4) and it is anti-simultaneously
Union II pole pipe (Db3、Db4) full-control type main switch (Sb3、Sb4) four bridge legs are constituted, by two band parallel resonance capacitor (Cc1、
Cc2) and anti-paralleled diode (Dc1、Dc2) full-control type main switch (Sb1、Sb2) the 5th bridge arm is constituted, by two band parallel resonances
Capacitor (Cc3、Cc4) and anti-paralleled diode (Dc3、Dc4) full-control type main switch (Sc3、Sc4) the 6th bridge arm is constituted, by resonance electricity
Feel (Lr) one in parallel by parallel resonance capacitor (Ca) and anti-paralleled diode (Da) full-control type auxiliary switch (Sa) cascoded clamp
Capacitor (Cc) circuit constitute auxiliary circuit；DC source (Udc) be connected in parallel on by auxiliary circuit and above-mentioned all bridge arms it is same
On DC bus, filter inductance L is passed through at the bridge arm midpoint of the first bridge arm and the second bridge arm1, filter capacitor C1The LC of composition is filtered
Device is connected with the low-pressure side of transformer A phase winding, and filter inductance L is passed through at the bridge arm midpoint of third bridge arm and four bridge legs2, filtering
Capacitor C2The LC filter of composition is connected with the low-pressure side of transformer B phase winding, the bridge arm midpoint of the 5th bridge arm and the 6th bridge arm
By filter inductance L3, filter capacitor C3The LC filter of composition is connected with the low-pressure side of transformer C phase winding；Three-phase transformer
High-pressure side be connected on respectively three-phase distribution net and load between.
2. a kind of modulator approach of the dynamic electric voltage recovery device based on soft switch circuit, it is characterised in that: first bridge arm is complete
Control type main switch (Sa1、Sa2), the second bridge arm full-control type main switch (Sa3、Sa4), third bridge arm full-control type main switch (Sb1、Sb2)、
Four bridge legs full-control type main switch (Sb3、Sb4), the 5th bridge arm full-control type main switch (Sc1、Sc2), the 6th bridge arm full-control type main switch
(Sc3、Sc4) controlled using no-voltage sinusoidal pulse width modulation method；In each switch periods, in above-mentioned six bridge arms
It is existing to be synchronized from anti-paralleled diode to the switch motion moment of the full-control type main switch change of current, while auxiliary branch is complete
Control type auxiliary switch (Sa) control signal and above-mentioned switch motion timing synchronization, i.e., in electric current from the inverse parallel of full-control type main switch
Diode is to turning off full-control type auxiliary switch (S before the full-control type main switch change of current momenta), the voltage on DC bus is humorous immediately
It shaking to zero, the full-control type main switch for that will open provides no-voltage and opens condition, at the time of all bridge arms complete the change of current, root
According to DC source (Udc) flow of power situation decide whether be added bridge arm direct pass process；When power flow direction is to flow into DC source
(Udc) when, it does not need that bridge arm direct pass process is added, it is humorous after above-mentioned all diodes terminate to full-control type main switch commutation course
Shake capacitor CaOn voltage by resonance be zero, full-control type auxiliary switch SaIt is open-minded to carry out no-voltage；When power flows out DC source
(Udc) when need to be added bridge arm direct pass process, at this time by above-mentioned full-control type main switch (Sa1~Sa4、Sb1~Sb4、Sc1~Sc4) complete
Portion's conducting, is realized to resonant inductance (Lr) fill can, completion fill full-control type auxiliary switch (S after energya) on voltage resonance arrives immediately
Zero, for the full-control type auxiliary switch (S that will be openeda) provide no-voltage open condition.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111245276A (en) * | 2020-03-27 | 2020-06-05 | 深圳市好盈科技有限公司 | Three-phase soft switching inverter and operation control strategy thereof |
| CN111416362A (en) * | 2020-03-26 | 2020-07-14 | 广东电网有限责任公司 | Dynamic voltage restorer of winding structure and control method thereof |
| CN111865067A (en) * | 2020-07-17 | 2020-10-30 | 浙江大学 | Control method for power factor correction circuit |
| CN113206599A (en) * | 2021-04-12 | 2021-08-03 | 三峡大学 | Diode bridge arm parallel type three-level rectification charger |
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| RUI LI等: ""A Zero-Voltage Switching Three-Phase Inverter"", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
| 李睿等: ""一种新型有源箝位软开关三相并网逆变器"", 《中国电机工程学报》 * |
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| CN111416362A (en) * | 2020-03-26 | 2020-07-14 | 广东电网有限责任公司 | Dynamic voltage restorer of winding structure and control method thereof |
| CN111416362B (en) * | 2020-03-26 | 2022-01-21 | 广东电网有限责任公司 | Dynamic voltage restorer of winding structure and control method thereof |
| CN111245276A (en) * | 2020-03-27 | 2020-06-05 | 深圳市好盈科技有限公司 | Three-phase soft switching inverter and operation control strategy thereof |
| CN111865067A (en) * | 2020-07-17 | 2020-10-30 | 浙江大学 | Control method for power factor correction circuit |
| CN111865067B (en) * | 2020-07-17 | 2021-06-11 | 浙江大学 | Control method for power factor correction circuit |
| CN113206599A (en) * | 2021-04-12 | 2021-08-03 | 三峡大学 | Diode bridge arm parallel type three-level rectification charger |
| CN113206599B (en) * | 2021-04-12 | 2023-12-19 | 三峡大学 | Diode bridge arm parallel three-level rectifying charger |
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Application publication date: 20190712 |