CN106208131A - Access for new forms of energy and the Multilevel Inverters topological structure of active distribution network - Google Patents
Access for new forms of energy and the Multilevel Inverters topological structure of active distribution network Download PDFInfo
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- CN106208131A CN106208131A CN201610584241.4A CN201610584241A CN106208131A CN 106208131 A CN106208131 A CN 106208131A CN 201610584241 A CN201610584241 A CN 201610584241A CN 106208131 A CN106208131 A CN 106208131A
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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
-
- 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
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/40—Fuel cell technologies in production processes
Abstract
The invention discloses a kind of access for new forms of energy and the Multilevel Inverters topological structure of active distribution network, specifically include 12 groups of electronic power switches, 2 dc-link capacitances, 6 feedback diodes and 3 clamp capacitors.The Multilevel Inverters topological structure of the present invention, by increasing the switching mode quantity of power switch, reduces the difficulty of striding capacitance voltage balance control, improves control motility；The balance that sinusoidal wave PWM modulation can be used to realize inverter function, beneficially striding capacitance voltage controls, and all has broad application prospects in occasions such as photovoltaic generating system, micro-capacitance sensor, wind-power electricity generation, fuel cell grid-connected system, active distribution network.
Description
Technical field
The invention belongs to New-energy power system and the active distribution network system of electrically-based electronic installation, be specifically related to one
Plant and can be used for new forms of energy access and many level topological structure of active distribution network.
Background technology
Power Electronic Technique is since the eighties of last century birth fifties, through developing rapidly of over half a century, the most
It is widely used in needing the every field of transformation of electrical energy.At the low power electrical domain of low pressure, each of Power Electronic Technique
Oneself is the most ripe for aspect, and goal in research in the future is high power density, high efficiency, high-performance；And in the transmission & distribution of high-power
Electrical domain, the technology of various aspects is just becoming the research emphasis of current Power Electronic Technique.Survey of Flexible AC Transmission System, high-voltage dc transmission
Electricity, the frequency control etc. of the big motor of high pressure all be unable to do without powerful power electronic equipment.
In several solutions realizing high-power conversion, to have little output waveform the most abnormal because of it for multi-level converter
The advantages such as variability (THD), low device voltage stress and low system electromagnetic interference (EMI) and favored by industrial quarters.Many
The concept of level converter is proposed in IEEE Industry Applications Society in 1980 annual meeting by A.Nabea et al. the earliest, this electricity
DC bus-bar voltage is divided into three level by the road electric capacity of two series connection, and each brachium pontis is connected with four switching tubes, with a pair
Series connection clamp diode and inner switch pipe are in parallel, and wherein, heart tap and the 3rd level connect, it is achieved neutral-point-clamped, form institute
Meaning neutral-point-clamped (NPC Neural Point Clamped) changer.In this circuit, main power tube only holds when turning off
By the half of DC bus-bar voltage, so being particularly suitable for high-power application scenario.Nineteen eighty-three, Bhagwat et al. is at this base
On plinth, tri-level circuit is generalized to any n level, NPC circuit and unified structure thereof have been made further research, these works
Research as high-voltage high-power converter provides new thinking.From the proposition of multi-level converter concept so far, short
In the time of more than 20 year, electronic power convertor application in New-energy power system and active distribution network obtains further
Development, but adapt to the most fewer of the technical need of new forms of energy access and active distribution network.
Summary of the invention
The invention aims to adapt to new forms of energy access and the technical need of active distribution network, propose one for new
The energy accesses and the Multilevel Inverters topological structure of active distribution network, by increasing the switching mode quantity of power switch, subtracts
The little difficulty of striding capacitance voltage balance control, improves control motility.
The technical scheme is that a kind of access and the Multilevel Inverters topology knot of active distribution network for new forms of energy
Structure, specifically includes 12 groups of electronic power switches, 2 dc-link capacitances, 6 feedback diodes and 3 clamp capacitors, its
In, described electronic power switch includes an audion and a clamp diode, and the colelctor electrode of described audion is with described
The connected the first terminal as described electronic power switch of the negative electrode of clamp diode, the emitter stage of described audion and described pincers
Connected second terminal as described electronic power switch of anode of position diode, the base stage of described audion meets the PWM of outside
Control signal；The first terminal of described first group of electronic power switch, the first terminal of second group of electronic power switch, the 3rd group
The first terminal of electronic power switch and the first end of the first dc-link capacitance are connected, as the first of described topological structure
Input；
Second terminal of described first group of electronic power switch, the 4th group of the first terminal of electronic power switch, first anti-
The negative electrode of feedback diode and the first end of the first clamp capacitor are connected；Second terminal of described second group of electronic power switch,
First end of the first terminal of five groups of electronic power switches, the negative electrode of the second feedback diode and the second clamp capacitor is connected；Institute
State the second terminal of the 3rd group of electronic power switch, the 6th group of the first terminal of electronic power switch, the 3rd feedback diode
First end of negative electrode and the 3rd clamp capacitor is connected；The anode of described first feedback diode, the anode of the second feedback diode,
The anode of the 3rd feedback diode, the negative electrode of the 4th feedback diode, the negative electrode of the 5th feedback diode, the 6th feedback diode
Negative electrode and the second end of the first dc-link capacitance be connected；
Second terminal of described 4th group of electronic power switch and the first terminal of the 7th group of electronic power switch are connected,
The first outfan as described topological structure；Second terminal of described 5th group of electronic power switch and the 8th group of power electronics
The first terminal of switch is connected, as the second outfan of described topological structure；The of described 6th group of electronic power switch
The first terminal of two-terminal and the 9th group of electronic power switch is connected, as the 3rd outfan of described topological structure；
Second end of described first clamp capacitor, the anode of the 4th feedback diode, the of the 7th group of electronic power switch
The first terminal of two-terminal and the tenth group of electronic power switch is connected；Second end of described second clamp capacitor, the 5th feedback two
The first terminal of the anode of pole pipe, the second terminal of the 8th group of electronic power switch and the 11st group of electronic power switch is connected；
Second end of described 3rd clamp capacitor, the anode of the 6th feedback diode, the 9th group of electronic power switch the second terminal with
The first terminal of the 12nd group of electronic power switch is connected；
The anode of described first feedback diode, the anode of the second feedback diode, the anode of the 3rd feedback diode,
Second end of one dc-link capacitance and the first end of the second dc-link capacitance are connected；The second of second dc-link capacitance
End and the second terminal of the tenth group of electronic power switch, the second terminal of the 11st group of electronic power switch and the 12nd group of electric power
Second terminal of electrical switch is connected, as the second input of described topological structure.
Beneficial effects of the present invention: the Multilevel Inverters topological structure of the present invention, by increasing the switch of power switch
Pattern quantity, reduces the difficulty of striding capacitance voltage balance control, improves control motility；Sinusoidal wave PWM can be used
Modulation realizes the balance of inverter function, beneficially striding capacitance voltage and controls, and sends out at photovoltaic generating system, micro-capacitance sensor, wind-force
The occasion such as electricity, fuel cell grid-connected system, active distribution network all has broad application prospects.
Accompanying drawing explanation
The Multilevel Inverters topological structure of Fig. 1 embodiment of the present invention, wherein, 12 groups of electronic power switches are respectively Qa1、
Qb1、Qc1、Qa2、Qb2、Qc2、Qa3、Qb3、Qc3、Qa4、Qb4、Qc4, 2 dc-link capacitances are respectively Cd1、Cd2, 6 feedback diodes
It is respectively Da2、Db2、Dc2、Da3、Db3、Dc3, 3 clamp capacitor Cxa、Cxb、Cxc。
Clamp capacitor charge circuit 1 schematic diagram of the Multilevel Inverters topological structure of Fig. 2 embodiment of the present invention.
Clamp capacitor charge circuit 2 schematic diagram of the Multilevel Inverters topological structure of Fig. 3 embodiment of the present invention.
Clamp capacitor discharge loop 1 schematic diagram of the Multilevel Inverters topological structure of Fig. 4 embodiment of the present invention.
Clamp capacitor discharge loop 2 schematic diagram of the Multilevel Inverters topological structure of Fig. 5 embodiment of the present invention.
Clamp capacitor discharge loop 3 schematic diagram of the Multilevel Inverters topological structure of Fig. 6 embodiment of the present invention.
Clamp capacitor discharge loop 4 schematic diagram of the Multilevel Inverters topological structure of Fig. 7 embodiment of the present invention.
Clamp capacitor discharge loop 5 schematic diagram of the Multilevel Inverters topological structure of Fig. 8 embodiment of the present invention.
Fig. 9 uses the modulation module schematic diagram of the Multilevel Inverters topological structure of SPWM mode.
A phase brachium pontis output mid-point voltage simulation waveform schematic diagram under the SPWM control mode of Figure 10 embodiment of the present invention.
The SPWM control mode of Figure 11 embodiment of the present invention rolls off the production line voltage UabSimulation waveform schematic diagram.
The dc-link capacitance C of Figure 12 Multilevel Inverters topological structured1And Cd2V diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings, embodiments of the invention are elaborated: the present embodiment with technical solution of the present invention is being
Implement under premise, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to
Following embodiment.
Fig. 1 gives the Multilevel Inverters topological structure of the embodiment of the present invention, specifically includes 12 groups of electronic power switches
Qa1、Qb1、Qc1、Qa2、Qb2、Qc2、Qa3、Qb3、Qc3、Qa4、Qb4、Qc4, 2 dc-link capacitance Cd1、Cd2, 6 feedback diodes
Da2、Db2、Dc2、Da3、Db3、Dc3, and 3 clamp capacitor Cxa、Cxb、Cxc, wherein, electronic power switch includes an audion
With a clamp diode, the colelctor electrode of described audion is connected as described power electronics with the negative electrode of described clamp diode
The first terminal of switch, the emitter stage of described audion is connected with the anode of described clamp diode and opens as described power electronics
The second terminal closed, the base stage of described audion connects the pwm control signal of outside.
Described first group of electronic power switch Qa1The first terminal, second group of electronic power switch Qb1The first terminal,
Three groups of electronic power switch Qc1The first terminal and the first dc-link capacitance Cd1The first end be connected, as described topology
The first input end of structure.
Described first group of electronic power switch Qa1The second terminal, the 4th group of electronic power switch Qa2The first terminal,
One feedback diode Da2Negative electrode and the first clamp capacitor CxaThe first end be connected；Described second group of electronic power switch Qb1's
Second terminal, the 5th group of electronic power switch Qb2The first terminal, the second feedback diode Db2Negative electrode and the second clamp capacitor
CxbThe first end be connected；Described 3rd group of electronic power switch Qc1The second terminal, the 6th group of electronic power switch Qc2First
Terminal, the 3rd feedback diode Dc2Negative electrode and the 3rd clamp capacitor CxcThe first end be connected；Described first feedback diode Da2
Anode, the second feedback diode Db2Anode, the 3rd feedback diode Dc2Anode, the 4th feedback diode Da3Negative electrode,
5th feedback diode Db3Negative electrode, the 6th feedback diode Qc3Negative electrode and the first dc-link capacitance Cd1The second end phase
Connect.
Described 4th group of electronic power switch Qa2The second terminal and the 7th group of electronic power switch Qa3The first terminal phase
Connect, as the first outfan of described topological structure；Described 5th group of electronic power switch Qb2The second terminal and the 8th group
Electronic power switch Qb3The first terminal be connected, as the second outfan of described topological structure；Described 6th group of electric power electricity
Son switch Qc2The second terminal and the 9th group of electronic power switch Qc3The first terminal be connected, as described topological structure
3rd outfan.
Described first clamp capacitor CxaThe second end, the 4th feedback diode Da3Anode, the 7th group of electronic power switch
Qa3The second terminal and the tenth group of electronic power switch Qa4The first terminal be connected；Described second clamp capacitor CxbThe second end,
5th feedback diode Db3Anode, the 8th group of electronic power switch Qb3The second terminal and the 11st group of electronic power switch
Qb4The first terminal be connected；Described 3rd clamp capacitor CxcThe second end, the 6th feedback diode Dc3Anode, the 9th group electricity
Power electrical switch Qc3The second terminal and the 12nd group of electronic power switch Qc4The first terminal be connected.
Da2、Db2、Dc2Anode, Cd1The second end and Cd2The first end be connected；Cd2The second end and the tenth group of electric power
Electrical switch Qa4The second terminal, the 11st group of electronic power switch Qb4The second terminal and the 12nd group of electronic power switch
Qc4The second terminal be connected, as the second input of described topological structure.
It should be understood that in electronic power switch, the base stage of each audion is the different control signals connect, by PWM
Modulated process determines, to those skilled in the art, is apparent from, no longer describes in detail.
It is different from traditional diode-clamped three-level inverter, so that midpoint potential is more prone to realize putting down
Weighing apparatus, introduces clamp capacitor, such as the C in Fig. 1xa、Cxb、CxcShown in, the introducing of clamp capacitor make second of each brachium pontis and
3rd power tube can not simultaneously turn on, and otherwise there will be the situation of clamp capacitor loop short circuit.Therefore, three level P, O, N
In O level can be obtained by two kinds of on-off modes, the on off state of each brachium pontis is increased to four by original three,
Which increase the control motility of system.
Modulation system uses space vector pulse width modulation technology (SVPWM), and its vector state is by 27 original increasings
Being added to present 64, add the factor such as smooth electric discharge needing to consider to ensure clamp capacitor, add that it realizes is tired
Difficult.Accordingly, it would be desirable to design a kind of advantage both having possessed SVPWM, inverse to this topological structure of the most simple and reliable control mode
Become device most important.
As a example by A phase, the O level in three level P, O, N can be obtained by two kinds of on-off modes: a kind of mode is to work as
Switching tube Qa1And Qa3Simultaneously turn on, switching tube Qa2And Qa4When simultaneously turning off；Another kind is as switching tube Qa2And Qa4Simultaneously turn on,
Switching tube Qa1And Qa3When simultaneously turning off.In the structure of the present embodiment, the on off state of switching device IGBT and the pass of output level
System is shown in Table 1.
The on off state of each IGBT of table 1 and the relation of output level
According to the mixed multi-level converter switches pattern table shown in table 1, as a example by A phase bridge wall, to each switching mode
Vector is described in detail as follows:
Vector P: now, Qa1、Qa2Conducting, Qa3、Qa4Turn off, if CxaVoltage less than E/2, then Cd1To add according to Fig. 2
Thick circuit loop is to CxaIt is charged.
Zero vector OA: now, Qa2、Qa4Conducting, Qa1、Qa3Turn off, if CxaVoltage less than E/2, then Cd2Will be according to Fig. 3
The circuit loop of overstriking is to CxaIt is charged.
Zero vector OB: now, Qa1、Qa3Conducting, Qa2、Qa4Turn off, if CxaVoltage less than E/2, then Cd1Will be according to Fig. 2
The circuit loop of overstriking is to CxaIt is charged.
Vector N: now, Qa3、Qa4Conducting, Qa1、Qa2Turn off, if CxaVoltage less than E/2, then Cd2To add according to Fig. 3
Thick circuit loop is to CxaIt is charged.
When systems are functioning properly, it is intended that the clamp capacitor of phase when this phase is in OA or OB state it would be possible to realize
Electric discharge；Can not discharge under P or N-state.
Fig. 4, Fig. 5, Fig. 6 sets forth the discharge loop of three-phase hybrid clamp three-level inverter clamp capacitor, specifically
Job analysis is as follows:
For Fig. 4, if A phase is in OA (0,1,0,1) state, as clamp capacitor CxaVoltage higher than E/2 time, it can edge
Overstriking show circuit to discharge；If A phase is in P (1,1,0,0) state, now the discharge loop of clamp capacitor is female by direct current
Line voltage E vises and cannot realize it and discharge smoothly, only occurs reducing suddenly and the least when DC bus-bar voltage
Electric discharge could be realized when clamp capacitor voltage.
For Fig. 5, it can be seen that clamp capacitor C under normal circumstancesxaDischarge loop by DC bus-bar voltage E
Vise, only could realize putting when DC bus-bar voltage occurs and reduces suddenly and be at a time less than clamp capacitor voltage
Electricity.
For Fig. 6, if A phase is in OB state (1,0,1,0) state, as clamp capacitor CxaVoltage higher than E/2 time, it can
To discharge along overstriking show circuit；If A phase is in N (0,0,1,1) state, now the discharge loop of clamp capacitor is by directly
Stream busbar voltage E is vised and cannot be realized it and discharge smoothly, only occurs reducing suddenly and in certain a period of time when DC bus-bar voltage
Electric discharge could be realized when carving less than clamp capacitor voltage.
For Fig. 7, if A phase is for OA state, C phase is OB state, now clamp capacitor CxaLine voltage in discharge loop is
Zero, work as CxaVoltage is higher than DC bus capacitor Cd2During voltage, CxaC can be discharged intod2And by unnecessary for part electric quantity consumption at electrical network
On, another part charge and discharge to Cd2On unnecessary electricity can be discharged by the loop of main circuit.Now C phase can not be N-state,
Otherwise make this discharge loop invalid due to the existence of discharge loop 1.
For Fig. 8, if A phase is for OB state, C phase is OA state, now clamp capacitor CxaLine voltage in discharge loop is
Zero, work as CxaVoltage is higher than DC bus capacitor C1During voltage, CxaC can be discharged into1And by unnecessary for part electric quantity consumption on electrical network,
Another part charge and discharge is to C1On unnecessary electricity can be discharged by the loop of main circuit.Now C phase can not be P-state, no
Then make this discharge loop invalid due to the existence of discharge loop 3.
Analyzed from above, during invertor operation, by the charge or discharge of different circuit, pincers can be made
Position electric capacity CxaOn voltage maintain near E/2.
For diode clamp type three-level inverter, the addition of clamp capacitor also alleviates device for power switching overvoltage
Effect.As a example by A phase, it is assumed that there is no clamp capacitor CxaExistence, as switching tube Qa1During shutoff, due in circuit we three electricity
The existence of sense, at Qa1Two ends will produce induction electromotive force.But due to clamp diode VD1Exist so that switching tube Qa1Two
The voltage of end is finally clamped at electric capacity Cd1Voltage on, overvoltage will not maintain；For switching tube Qa4, the principle of clamper and
Switching tube Qa1Identical.But for switching tube Qa2And Qa3For, situation is different, diode Da2And Da3Pincers cannot be provided for it
Position path (if overvoltage exceedes direct current power source voltage E, then can pass through derided capacitors Cd1And Cd2Electric discharge, but this exceedes out
Close pipe Qa2And Qa3Normal resistance to voltage levels), overvoltage just cannot eliminate.
Add clamp capacitor CxaAfter, due to CxaRespectively with feedback diode Da2Or Da3Constitute clamp circuit so that switch
Pipe Qa2Or Qa3The overvoltage produced during shutoff is clamped (CxaVoltage and Cd1Cd2Identical).
As the above analysis, under system normal operating condition, hybrid clamp formula Multilevel Inverters exists following several
Individual feature:
(1) when A phase is on off state OA, during B, C are biphase, C can be realized simply by the presence of on off state N or OBxa's
Electric discharge.
(2) when A phase is on off state OB, during B, C are biphase, C can be realized simply by the presence of on off state P or OAxa's
Electric discharge.
(3) when A phase is in state P or N, only it is possible to when significantly bust occurs in DC bus-bar voltage realize
CxaElectric discharge.
Meet the control method of three conditions above so that CxaIt is able to quick discharge and recharge, such that it is able to keep midpoint
Current potential and the balance of clamp capacitor voltage.
In conjunction with the analysis to A phase, the hybrid clamp formula Multilevel Inverters proposed for the present invention, it can be deduced that three ratios
More general conclusion is as follows:
(1) when wherein a phase is on off state OA, the most biphase in can be real simply by the presence of on off state N or OB
The now electric discharge of this phase clamp capacitor.
(2) when wherein a phase is on off state OB, the most biphase in can be real simply by the presence of on off state P or OA
The now electric discharge of this phase clamp capacitor.
(3) when wherein a phase is in state P or N, only just having when significantly bust occurs in DC bus-bar voltage can
The electric discharge of this phase clamp capacitor can be realized.
From above-mentioned three conclusions, when designing modulator approach, if make on off state as much as possible meet this three
Bar rule ensures that clamp capacitor successfully discharge and recharge, thus the balance of Reliable guarantee midpoint potential.
Fig. 9 is the Multilevel Inverters modulation module using SPWM mode, first by modulating wave uraWith two phase
The triangular carrier CA of 180 °1, CA2Relatively: if ura>CA1, then output logic 1；If ura≤CA1, then logical zero is exported.uraWith CA2's
The most in like manner.
If two logic outputs add up to 2, then output switch vector (Qa1, Qa3, Qa2, Qa4)=(1,1,0,0), corresponding
Vector P；
If two logic outputs add up to 0, then output switch vector (Qa1, Qa3, Qa2, Qa4)=1 (0,0,1), corresponding
Vector N；
If two logic outputs add up to 1, then judging modulating wave uraWhether more than 0:ura> 0 time, output switch
Vector (Qa1, Qa3, Qa2, Qa4)=(1,0,1,0), corresponding vector OB；uraWhen≤0, output switch vector (Qa1, Qa3, Qa2, Qa4)
=(0,1,0,1), corresponding vector OA.
It is under SPWM modulation system as shown in Figure 10, hybrid clamp formula Multilevel Inverters A phase brachium pontis midpoint output voltage
Waveform, brachium pontis output+325V, three level voltages of 0V and-325V.Figure 11 is the line voltage U between A, B phaseab, it can be seen that
The output of line voltage has ± 650V, five level voltages of ± 325V and 0V.Figure 12 shows dc-link capacitance Cd1And Cd2Electricity
Pressure, it can be seen that during stable operation, Cd1、Cd2Voltage remain at 325V, fluctuation is less than 1V up and down, for directly
The half of stream busbar voltage.
Above-mentioned analysis result shows, the hybrid clamp formula Multilevel Inverters topological structure that the embodiment of the present invention proposes, logical
Cross the switching mode quantity increasing power switch, reduce the difficulty of striding capacitance voltage balance control, improve control flexibly
Property.The topological structure that the present invention proposes is photovoltaic generating system, micro-capacitance sensor, wind-power electricity generation, fuel cell grid-connected system, master
The occasions such as dynamic power distribution network all have broad application prospects.
Those of ordinary skill in the art it will be appreciated that embodiment described here be to aid in reader understanding this
Bright principle, it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This area
It is each that those of ordinary skill can make various other without departing from essence of the present invention according to these technology disclosed by the invention enlightenment
Planting concrete deformation and combination, these deform and combine the most within the scope of the present invention.
Claims (1)
1. access for new forms of energy and a Multilevel Inverters topological structure for active distribution network, specifically include 12 groups of electric power electricity
Son switch, 2 dc-link capacitances, 6 feedback diodes and 3 clamp capacitors, wherein, described electronic power switch
Including an audion and a clamp diode, the negative electrode phase continuous cropping of the colelctor electrode of described audion and described clamp diode
For the first terminal of described electronic power switch, the emitter stage of described audion is connected with the anode of described clamp diode conduct
Second terminal of described electronic power switch, the base stage of described audion connects the pwm control signal of outside；Described first group of electric power
The first terminal of electrical switch, the first terminal of second group of electronic power switch, the first terminal of the 3rd group of electronic power switch
It is connected with the first end of the first dc-link capacitance, as the first input end of described topological structure；
Second terminal of described first group of electronic power switch, the 4th group of the first terminal of electronic power switch, the first feedback two
The negative electrode of pole pipe and the first end of the first clamp capacitor are connected；Second terminal of described second group of electronic power switch, the 5th group
First end of the first terminal of electronic power switch, the negative electrode of the second feedback diode and the second clamp capacitor is connected；Described
Second terminal of three groups of electronic power switches, the 6th group of the first terminal of electronic power switch, the negative electrode of the 3rd feedback diode
It is connected with the first end of the 3rd clamp capacitor；The anode of described first feedback diode, the anode of the second feedback diode, the 3rd
The anode of feedback diode, the negative electrode of the 4th feedback diode, the negative electrode of the 5th feedback diode, the moon of the 6th feedback diode
Pole is connected with the second end of the first dc-link capacitance.
Second terminal of described 4th group of electronic power switch and the first terminal of the 7th group of electronic power switch are connected, as
First outfan of described topological structure；Second terminal of described 5th group of electronic power switch and the 8th group of electronic power switch
The first terminal be connected, as the second outfan of described topological structure；Second end of described 6th group of electronic power switch
Son is connected with the first terminal of the 9th group of electronic power switch, as the 3rd outfan of described topological structure；
Second end of described first clamp capacitor, the anode of the 4th feedback diode, the second end of the 7th group of electronic power switch
Son is connected with the first terminal of the tenth group of electronic power switch；Second end of described second clamp capacitor, the 5th feedback diode
Anode, the second terminal of the 8th group of electronic power switch and the 11st group of electronic power switch the first terminal be connected；Described
Second end of the 3rd clamp capacitor, the anode of the 6th feedback diode, second terminal and the tenth of the 9th group of electronic power switch
The first terminal of two groups of electronic power switches is connected；
The anode of described first feedback diode, the anode of the second feedback diode, the anode of the 3rd feedback diode, first straight
Second end of stream bus capacitor and the first end of the second dc-link capacitance are connected；Second end of the second dc-link capacitance with
Second terminal of the tenth group of electronic power switch, the second terminal of the 11st group of electronic power switch and the 12nd group of power electronics
Second terminal of switch is connected, as the second input of described topological structure.
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| CN109372698A (en) * | 2018-10-18 | 2019-02-22 | 明阳智慧能源集团股份公司 | A kind of wind generator system |
| CN109742965A (en) * | 2019-01-11 | 2019-05-10 | 浙江大学 | A kind of high-frequency isolation type AC-DC converter of single-phase crisscross parallel three level resonance formula |
| CN113517817A (en) * | 2021-06-07 | 2021-10-19 | 燕山大学 | Three-level bidirectional full-bridge LLCLC multi-resonant converter topology |
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