CN106208131B - Multilevel Inverters topological structure for new energy access and active distribution network - Google Patents
Multilevel Inverters topological structure for new energy access and active distribution network Download PDFInfo
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- CN106208131B CN106208131B CN201610584241.4A CN201610584241A CN106208131B CN 106208131 B CN106208131 B CN 106208131B CN 201610584241 A CN201610584241 A CN 201610584241A CN 106208131 B CN106208131 B CN 106208131B
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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
-
- 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 Multilevel Inverters topological structures for new energy access and active distribution network, specifically include 12 groups of electronic power switches, 2 dc-link capacitances, 6 feedback diodes and 3 clamp capacitors.Multilevel Inverters topological structure of the invention reduces the difficulty of striding capacitance voltage balance control, improves control flexibility by increasing the switching mode quantity of power switch；Inverter function can be realized using sinusoidal wave PWM modulation, be conducive to the balance control of striding capacitance voltage, have broad application prospects in occasions such as photovoltaic generating system, micro-capacitance sensor, wind-power electricity generation, fuel cell grid-connected system, active distribution networks.
Description
Technical field
The invention belongs to New-energy power systems and active distribution network system based on power electronic equipment, and in particular to one
Kind can be used for more level topological structures of new energy access and active distribution network.
Background technique
Power electronic technique is since the last century 50's is born, by the rapid development of over half a century, so far
It is widely used in needing the every field of transformation of electrical energy.Low pressure it is low power use electrical domain, power electronic technique it is each
Oneself is gradually mature for aspect, and the goal in research in future is high power density, high efficiency, high-performance；And in the transmission & distribution of high-power
Electrical domain, the technology of various aspects are just becoming the research emphasis of current power electronic technique.Survey of Flexible AC Transmission System, high-voltage dc transmission
Electricity, frequency control of the big motor of high pressure etc. all be unable to do without powerful power electronic equipment.
In several solutions for realizing high-power transformation, multi-level converter is always abnormal with small output waveform because of it
The advantages that variability (THD), low device voltage stress and low system electromagnetic interference (EMI) and the favor by industry.It is more
The concept of level converter is proposed in IEEE Industry Applications Society annual meeting in 1980 by A.Nabea et al. earliest, the electricity
DC bus-bar voltage is divided into three level with two concatenated capacitors by road, and each bridge arm is connected with four switching tubes, with a pair
Series connection clamp diode and inner switch pipe are in parallel, wherein heart tap is connected with third level, realizes neutral-point-clamped, forms institute
Call neutral-point-clamped (NPC-Neural Point Clamped) converter.In this circuit, it is only held when main power tube turns off
By the half of DC bus-bar voltage, so being particularly suitable for high-power application.Nineteen eighty-three, Bhagwat et al. is in this base
On plinth, tri-level circuit is generalized to any n level, further research has been made to NPC circuit and its unified structure, these works
Research as high-voltage high-power converter provides new thinking.So far from the proposition of multi-level converter concept, short
In more than 20 years time, application of the electronic power convertor in New-energy power system and active distribution network is obtained further
Development, but the technical need of the access of adaptation new energy and active distribution network is also fewer.
Summary of the invention
The purpose of the invention is to adapt to the technical need of new energy access and active distribution network, propose a kind of for new
The Multilevel Inverters topological structure of the energy access and active distribution network is subtracted by increasing the switching mode quantity of power switch
The small difficulty of striding capacitance voltage balance control, improves control flexibility.
The technical solution of the present invention is as follows: a kind of Multilevel Inverters topology knot for new energy access and active distribution network
Structure specifically includes 12 groups of electronic power switches, 2 dc-link capacitances, 6 feedback diodes and 3 clamp capacitors,
In, the electronic power switch include a triode and a clamp diode, the collector of the triode with it is described
The connected first terminal as the electronic power switch of the cathode of clamp diode, the emitter of the triode and the pincers
The Second terminal that the anode of position diode is connected as the electronic power switch, the base stage of the triode meet external PWM
Control signal；The first terminal of first group of electronic power switch, the first terminal of second group of electronic power switch, third group
The first terminal of electronic power switch is connected with the first end of the first dc-link capacitance, first as the topological structure
Input terminal；
It is the Second terminal of first group of electronic power switch, the first terminal of the 4th group of electronic power switch, first anti-
The cathode of feedback diode is connected with the first end of the first clamp capacitor；The Second terminal of second group of electronic power switch,
The first terminal of five groups of electronic power switches, the second feedback diode cathode be connected with the first end of the second clamp capacitor；Institute
State the Second terminal of third group electronic power switch, the first terminal of the 6th group of electronic power switch, third feedback diode
Cathode is connected with the first end of third clamp capacitor；The anode of first feedback diode, the second feedback diode anode,
The anode of third feedback diode, the cathode of the 4th feedback diode, the 5th feedback diode cathode, the 6th feedback diode
Cathode be connected with the second end of the first dc-link capacitance；
The Second terminal of the 4th group of electronic power switch is connected with the first terminal of the 7th group of electronic power switch,
The first output end as the topological structure；The Second terminal and the 8th group of power electronics of the 5th group of electronic power switch
The first terminal of switch is connected, the second output terminal as the topological structure；The of the 6th group of electronic power switch
Two-terminal is connected with the first terminal of the 9th group of electronic power switch, the third output end as the topological structure；
The second end of first clamp capacitor, the anode of the 4th feedback diode, the 7th group of electronic power switch
Two-terminal is connected with the first terminal of the tenth group of electronic power switch；The second end of second clamp capacitor, the 5th feedback two
The anode of pole pipe, the 8th group of electronic power switch Second terminal be connected with the first terminal of the 11st group of electronic power switch；
The second end of the third clamp capacitor, the anode of the 6th feedback diode, the 9th group of electronic power switch Second terminal with
The first terminal of 12nd group of electronic power switch is connected；
The anode of first feedback diode, the anode of the second feedback diode, the anode of third feedback diode,
The second end of one dc-link capacitance is connected with the first end of the second dc-link capacitance；The second of second dc-link capacitance
End and the Second terminal of the tenth group of electronic power switch, the Second terminal and the 12nd group of electric power of the 11st group of electronic power switch
The Second terminal of electronic switch is connected, the second input terminal as the topological structure.
Beneficial effects of the present invention: Multilevel Inverters topological structure of the invention, by the switch for increasing power switch
Mode quantity reduces the difficulty of striding capacitance voltage balance control, improves control flexibility；Sinusoidal wave PWM can be used
Inverter function is realized in modulation, is conducive to the balance control of striding capacitance voltage, in photovoltaic generating system, micro-capacitance sensor, wind-force hair
The occasions such as electricity, fuel cell grid-connected system, active distribution network have broad application prospects.
Detailed description of the invention
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
Respectively Da2、Db2、Dc2、Da3、Db3、Dc3, 3 clamp capacitor Cxa、Cxb、Cxc。
1 schematic diagram of clamp capacitor charge circuit of the Multilevel Inverters topological structure of Fig. 2 embodiment of the present invention.
2 schematic diagram of clamp capacitor charge circuit of the Multilevel Inverters topological structure of Fig. 3 embodiment of the present invention.
1 schematic diagram of clamp capacitor discharge loop of the Multilevel Inverters topological structure of Fig. 4 embodiment of the present invention.
2 schematic diagram of clamp capacitor discharge loop of the Multilevel Inverters topological structure of Fig. 5 embodiment of the present invention.
3 schematic diagram of clamp capacitor discharge loop of the Multilevel Inverters topological structure of Fig. 6 embodiment of the present invention.
4 schematic diagram of clamp capacitor discharge loop of the Multilevel Inverters topological structure of Fig. 7 embodiment of the present invention.
5 schematic diagram of clamp capacitor discharge loop 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 bridge arm exports mid-point voltage simulation waveform schematic diagram under the SPWM control mode of Figure 10 embodiment of the present invention.
Line voltage U under the SPWM control mode of Figure 11 embodiment of the present inventionabSimulation waveform schematic diagram.
The dc-link capacitance C of Figure 12 Multilevel Inverters topological structured1And Cd2V diagram.
Specific embodiment
With reference to the accompanying drawing, elaborate to the embodiment of the present invention: the present embodiment is being with technical solution of the present invention
Under the premise of implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
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、Dc3And 3 clamp capacitor Cxa、Cxb、Cxc, wherein electronic power switch includes a triode
With a clamp diode, the collector of the triode is connected as the power electronics with the cathode of the clamp diode
The first terminal of switch, the emitter of the triode is connected with the anode of the clamp diode to be opened as the power electronics
The Second terminal of pass, the base stage of the triode connect external pwm control signal.
First group of electronic power switch Qa1First terminal, second group of electronic power switch Qb1First terminal,
Three groups of electronic power switch Qc1First terminal and the first dc-link capacitance Cd1First end be connected, as the topology
The first input end of structure.
First group of electronic power switch Qa1Second terminal, the 4th group of electronic power switch Qa2First terminal,
One feedback diode Da2Cathode and the first clamp capacitor CxaFirst end be connected；Second group of electronic power switch Qb1's
Second terminal, the 5th group of electronic power switch Qb2First terminal, the second feedback diode Db2Cathode and the second clamp capacitor
CxbFirst end be connected；The third group electronic power switch Qc1Second terminal, the 6th group of electronic power switch Qc2First
Terminal, third feedback diode Dc2Cathode and third clamp capacitor CxcFirst end be connected；The first feedback diode Da2
Anode, the second feedback diode Db2Anode, third feedback diode Dc2Anode, the 4th feedback diode Da3Cathode,
5th feedback diode Db3Cathode, the 6th feedback diode Qc3Cathode and the first dc-link capacitance Cd1Second end phase
Connection.
The 4th group of electronic power switch Qa2Second terminal and the 7th group of electronic power switch Qa3First terminal phase
Connection, the first output end as the topological structure；The 5th group of electronic power switch Qb2Second terminal with the 8th group
Electronic power switch Qb3First terminal be connected, the second output terminal as the topological structure；The 6th group of electric power electricity
Sub switch Qc2Second terminal and the 9th group of electronic power switch Qc3First terminal be connected, as the topological structure
Third output end.
The first clamp capacitor CxaSecond end, the 4th feedback diode Da3Anode, the 7th group of electronic power switch
Qa3Second terminal and the tenth group of electronic power switch Qa4First terminal be connected；The second clamp capacitor CxbSecond end,
5th feedback diode Db3Anode, the 8th group of electronic power switch Qb3Second terminal and the 11st group of electronic power switch
Qb4First terminal be connected；The third clamp capacitor CxcSecond end, the 6th feedback diode Dc3Anode, the 9th group electricity
Power electronic switch Qc3Second terminal and the 12nd group of electronic power switch Qc4First terminal be connected.
Da2、Db2、Dc2Anode, Cd1Second end and Cd2First end be connected；Cd2Second end and the tenth group of electric power
Electronic switch Qa4Second terminal, the 11st group of electronic power switch Qb4Second terminal and the 12nd group of electronic power switch
Qc4Second terminal be connected, the second input terminal as the topological structure.
It should be understood that the base stage of each triode is the different control signals connect in electronic power switch, by PWM
Modulated process determines, is it will be apparent that being no longer described in detail to those skilled in the art.
Different from traditional diode-clamped three-level inverter, in order to enable midpoint potential be easier to realize it is flat
Weighing apparatus, introduces clamp capacitor, C as shown in figure 1xa、Cxb、CxcIt is shown, the introducing of clamp capacitor so that second of each bridge arm and
Third power tube cannot simultaneously turn on, and otherwise will appear the situation of clamp capacitor circuit short circuit.Therefore, three level P, O, N
In O level can be obtained by two kinds of on-off modes, the switch state of each bridge arm increases to four by original three,
Which increase the control flexibilities of system.
Modulation system uses space vector pulse width modulation technology (SVPWM), and vector state is by 27 original increasings
Present 64 are added to, along with factors such as the smooth electric discharges for needing to consider to guarantee clamp capacitor, increase the tired of its realization
It is difficult.Therefore, it is necessary to design one kind not only to have the advantages of SVPWM, but also simple and reliable control mode to the inverse of this topological structure
It is most important to become device.
By taking A phase as an example, 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 Qa3It simultaneously turns 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 switch state of switching device IGBT and the pass of output level
System is shown in Table 1.
The switch state of each IGBT of table 1 and the relationship of output level
According to mixed multi-level converter switches mode table shown in table 1, by taking A Xiang Qiaobi as an example, to each switching mode
Vector is described in detail as follows:
Vector P: at this point, Qa1、Qa2Conducting, Qa3、Qa4Shutdown, if CxaVoltage be lower than E/2, then Cd1It will add according to Fig. 2
Thick circuit loop is to CxaIt charges.
Zero vector OA: at this point, Qa2、Qa4Conducting, Qa1、Qa3Shutdown, if CxaVoltage be lower than E/2, then Cd2It will be according to Fig. 3
The circuit loop of overstriking is to CxaIt charges.
Zero vector OB: at this point, Qa1、Qa3Conducting, Qa2、Qa4Shutdown, if CxaVoltage be lower than E/2, then Cd1It will be according to Fig. 2
The circuit loop of overstriking is to CxaIt charges.
Vector N: at this point, Qa3、Qa4Conducting, Qa1、Qa2Shutdown, if CxaVoltage be lower than E/2, then Cd2It will add according to Fig. 3
Thick circuit loop is to CxaIt charges.
When systems are functioning properly, the clamp capacitor of phase is specified to would be possible to realize when this is mutually in OA OB state
Electric discharge；It cannot discharge at P or N-state.
The discharge loop of three-phase hybrid clamp three-level inverter clamp capacitor is set forth in Fig. 4, Fig. 5, Fig. 6, specifically
Job analysis is as follows:
For Fig. 4, if A phase is in OA (0,1,0,1) state, as clamp capacitor CxaVoltage be higher than E/2 when, can edge
Overstriking show circuit discharge；If A phase is in P (1,1,0,0) state, the discharge loop of clamp capacitor is by direct current mother at this time
Line voltage E is vised and be cannot achieve it and smoothly discharge, only when DC bus-bar voltage appearance reduces suddenly and at a time small
Electric discharge is just able to achieve when clamp capacitor voltage.
For Fig. 5, it can be seen from the figure that clamp capacitor C under normal circumstancesxaDischarge loop by DC bus-bar voltage E
It vises, is only just able to achieve and puts when reduction suddenly occurs in DC bus-bar voltage and is 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 be higher than E/2 when, can
To discharge along overstriking show circuit；If A phase is in N (0,0,1,1) state, the discharge loop of clamp capacitor is straight at this time
Stream busbar voltage E is vised and be cannot achieve its smooth electric discharge, only when reducing suddenly and in certain a period of time occurs in DC bus-bar voltage
It carves and is just able to achieve electric discharge when being less than clamp capacitor voltage.
For Fig. 7, if A phase is OA state, C phase is OB state, at this time clamp capacitor CxaLine voltage in discharge loop is
Zero, work as CxaVoltage is higher than DC bus capacitor Cd2When voltage, CxaC can be discharged intod2And by the extra electric quantity consumption in part in power grid
On, another part charge and discharge to Cd2On extra electricity can be discharged by the circuit of main circuit.C phase cannot be N-state at this time,
Otherwise since the presence of discharge loop 1 makes this discharge loop invalid.
For Fig. 8, if A phase is OB state, C phase is OA state, at this time clamp capacitor CxaLine voltage in discharge loop is
Zero, work as CxaVoltage is higher than DC bus capacitor C1When voltage, CxaC can be discharged into1And by the extra electric quantity consumption in part on power grid,
Another part charge and discharge is to C1On extra electricity can be discharged by the circuit of main circuit.C phase cannot be P-state at this time, no
Then since the presence of discharge loop 3 makes this discharge loop invalid.
By analyzing above it is found that during invertor operation, by the charge or discharge of different circuit, it can make to clamp
Position capacitor CxaOn voltage maintain near E/2.
For diode clamp type three-level inverter, there are also mitigate device for power switching overvoltage for the addition of clamp capacitor
Effect.By taking A phase as an example, it is assumed that there is no clamp capacitor CxaPresence, as switching tube Qa1When shutdown, due in route we three electricity
The presence of sense, in Qa1Both ends will generate induced electromotive force.But due to clamp diode VD1In the presence of so that switching tube Qa1Two
The voltage at end is finally clamped at capacitor Cd1Voltage on, overvoltage will not maintain；For switching tube Qa4, the principle of clamper and
Switching tube Qa1It is identical.But for switching tube Qa2And Qa3For, situation is different, diode Da2And Da3Pincers can not be provided for it
Position access (if overvoltage is more than direct current power source voltage E, can pass through derided capacitors Cd1And Cd2Electric discharge, but this is more than out
Close pipe Qa2And Qa3Normal resistance to voltage levels), overvoltage can not just be eliminated.
Clamp capacitor C is addedxaAfterwards, due to CxaRespectively with feedback diode Da2Or Da3Clamp circuit is constituted, so that switch
Pipe Qa2Or Qa3The overvoltage generated when shutdown is clamped (CxaVoltage and Cd1Cd2It is identical).
As the above analysis, under system normal operating condition, there are following several for hybrid clamp formula Multilevel Inverters
A feature:
(1) when A phase is in switch state OA, C can be realized simply by the presence of switch state N or OB in B, C two-phasexa's
Electric discharge.
(2) when A phase is in switch state OB, C can be realized simply by the presence of switch state P or OA in B, C two-phasexa's
Electric discharge.
(3) it when A phase is in state P or N, only is possible to realize when substantially bust occurs in DC bus-bar voltage
CxaElectric discharge.
The control method for meeting three conditions above can make CxaQuick charge and discharge are able to, so as to keep midpoint
The balance of current potential and clamp capacitor voltage.
In conjunction with the analysis to A phase, for hybrid clamp formula Multilevel Inverters proposed by the present invention, it can be deduced that three ratios
More general conclusion is as follows:
It (1), in addition can be real simply by the presence of switch state N or OB in two-phase when wherein a phase is in switch state OA
The now electric discharge of the phase clamp capacitor.
It (2), in addition can be real simply by the presence of switch state P or OA in two-phase when wherein a phase is in switch state OB
The now electric discharge of the phase clamp capacitor.
(3) when wherein a phase is in state P or N, only just having when substantially bust occurs in DC bus-bar voltage can
It is able to achieve the electric discharge of the phase clamp capacitor.
By above-mentioned three conclusions it is found that when designing modulator approach, if make switch state as much as possible meet this three
Item rule ensures that clamp capacitor successfully charge and discharge, so as to by the balance for guaranteeing midpoint potential.
Fig. 9 is the Multilevel Inverters modulation module using SPWM mode, first by modulating wave uraWith two phase phase differences
180 ° of triangular carrier CA1, CA2Compare: if ura>CA1, then logic 1 is exported；If ura≤CA1, then logical zero is exported.uraWith CA2's
Compare similarly.
If two logic outputs add up to 2, switching vector selector (Q is exporteda1, Qa3, Qa2, Qa4)=(1,1,0,0), it is corresponding
Vector P；
If two logic outputs add up to 0, switching vector selector (Q is exporteda1, Qa3, Qa2, Qa4)=1 (0,0,1), it is corresponding
Vector N；
If two logic outputs add up to 1, modulating wave u is being judgedraWhether 0:u is greater thanraWhen > 0, output switch
Vector (Qa1, Qa3, Qa2, Qa4)=(1,0,1,0), corresponding vector OB；uraWhen≤0, switching vector selector (Q is exporteda1, Qa3, Qa2, Qa4)
=(0,1,0,1), corresponding vector OA.
It is as shown in Figure 10 hybrid clamp formula Multilevel Inverters A phase bridge arm midpoint output voltage under SPWM modulation system
Waveform, bridge arm output+325V, 0V and three level voltages of -325V.Line voltage U of the Figure 11 between A, B phaseab, it can be seen that
Line voltage output has ± 650V, ± 325V and five level voltages of 0V.Figure 12 shows dc-link capacitance Cd1And Cd2Electricity
Pressure, it can be seen from the figure that when stable operation, Cd1、Cd2Voltage remain at 325V, up and down fluctuation be no more than 1V, be straight
Flow the half of busbar voltage.
Above-mentioned analysis the result shows that, the embodiment of the present invention propose hybrid clamp formula Multilevel Inverters topological structure, lead to
The switching mode quantity for increasing power switch is crossed, the difficulty of striding capacitance voltage balance control is reduced, it is flexible to improve control
Property.Topological structure proposed by the present invention is in photovoltaic generating system, micro-capacitance sensor, wind-power electricity generation, fuel cell grid-connected system, master
The occasions such as dynamic power distribution network have broad application prospects.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill can according to the present invention disclosed the technical disclosures make it is various do not depart from essence of the invention other are each
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (1)
1. a kind of Multilevel Inverters topological structure for new energy access and active distribution network specifically includes 12 groups of electric power electricity
Sub switch Qa1、Qb1、Qc1、Qa2、Qb2、Qc2、Qa3、Qb3、Qc3、Qa4、Qb4、Qc4, 2 dc-link capacitance Cd1、Cd2, 6 feedbacks two
Pole pipe Da2、Db2、Dc2、Da3、Db3、Dc3And 3 clamp capacitor Cxa、Cxb、Cxc, wherein the electronic power switch includes
One triode and a clamp diode, the collector of the triode are connected as institute with the cathode of the clamp diode
The first terminal of electronic power switch is stated, the emitter of the triode is connected described in conduct with the anode of the clamp diode
The Second terminal of electronic power switch, the base stage of the triode connect external pwm control signal；First group of electronic power switch
Qa1First terminal, second group of electronic power switch Qb1First terminal, third group electronic power switch Qc1First terminal with
First dc-link capacitance Cd1First end be connected, the first input end as the topological structure；
First group of electronic power switch Qa1Second terminal, the 4th group of electronic power switch Qa2First terminal, first anti-
Present diode Da2Cathode and the first clamp capacitor CxaFirst end be connected；Second group of electronic power switch Qb1Second
Terminal, the 5th group of electronic power switch Qb2First terminal, the second feedback diode Db2Cathode and the second clamp capacitor Cxb's
First end is connected；The third group electronic power switch Qc1Second terminal, the 6th group of electronic power switch Qc2First end
Son, third feedback diode Qc2Cathode and third clamp capacitor CxcFirst end be connected；The first feedback diode Da2's
Anode, the second feedback diode Db2Anode, third feedback diode Dc2Anode, the 4th feedback diode Da3Cathode,
Five feedback diode Db3Cathode, the 6th feedback diode Qc3Cathode and the first dc-link capacitance Cd1Second end be connected
It connects；
The 4th group of electronic power switch Qa2Second terminal and the 7th group of electronic power switch Qa3First terminal be connected,
The first output end as the topological structure；The 5th group of electronic power switch Qb2Second terminal and the 8th group of electric power electricity
Sub switch Qb3First terminal be connected, the second output terminal as the topological structure；The 6th group of electronic power switch
Qc2Second terminal and the 9th group of electronic power switch Qc3First terminal be connected, the third as the topological structure is defeated
Outlet；
The first clamp capacitor CxaSecond end, the 4th feedback diode Da3Anode, the 7th group of electronic power switch Da3's
Second terminal and the tenth group of electronic power switch Qa4First terminal be connected；The second clamp capacitor CxbSecond end, the 5th
Feedback diode Db3Anode, the 8th group of electronic power switch Qb3Second terminal and the 11st group of electronic power switch Qb4's
First terminal is connected；The third clamp capacitor CxcSecond end, the 6th feedback diode Dc3Anode, the 9th group of electric power electricity
Sub switch Qc3Second terminal and the 12nd group of electronic power switch Qc4First terminal be connected；
The first feedback diode Da2Anode, the second feedback diode Db2Anode, third feedback diode Dc2Sun
Pole, the first dc-link capacitance Cd1Second end and the second dc-link capacitance Cd2First end be connected；Second DC bus
Capacitor Cd2Second end and the tenth group of electronic power switch Qa4Second terminal, the 11st group of electronic power switch Qb4Second
Terminal and the 12nd group of electronic power switch Qc4Second terminal be connected, the second input terminal as the topological structure；
The relationship and A phase of the switch state of B phase and C phase and output level similarly, in A phase, when for vector P, Qa1、Qa2It leads
It is logical, Qa3、Qa4Shutdown, if CxaVoltage be lower than E/2, then Cd1To CxaIt charges；Wherein, E indicates direct current power source voltage；
When for zero vector OA, Qa2、Qa4Conducting, Qa1、Qa3Shutdown, if CxaVoltage be lower than E/2, then Cd2To CxaIt charges；
When for zero vector OB, Qa1、Qa3Conducting, Qa2、Qa4Shutdown, if CxaVoltage be lower than E/2, then Cd1To CxaIt charges；
When for vector N, Qa3、Qa4Conducting, Qa1、Qa2Shutdown, if CxaVoltage be lower than E/2, then Cd2To CxaIt charges；
CxaRespectively with feedback diode Da2Or Da3Clamp circuit is constituted, switching tube Q is madea2Or Qa3The overvoltage generated when shutdown
It is clamped, CxaVoltage and Cd1Cd2It is identical；
It is modulated using SPWM mode, by modulating wave uraWith two 180 ° of phase phase difference of triangular carrier CA1, CA2Compare: if
ura>CA1, then logic 1 is exported；If ura≤CA1, then logical zero is exported；uraWith CA2Comparison similarly；
If two logic outputs add up to 2, switching vector selector (Qa1, Qa3, Qa2, Qa4)=(1,1,0,0), corresponding vector are exported
P；
If two logic outputs add up to 0, switching vector selector (Q is exporteda1, Qa3, Qa2, Qa4)=1 (0,0,1,1), corresponding vector N；
If two logic outputs add up to 1, modulating wave u is judgedraWhether 0:u is greater thanraWhen > 0, switching vector selector (Q is exporteda1, Qa3,
Qa2, Qa4)=(1,0,1,0), corresponding vector OB；uraWhen≤0, switching vector selector (Q is exporteda1, Qa3, Qa2, Qa4)=(0,1,0,1),
Corresponding vector OA.
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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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| CN101860319A (en) * | 2010-06-01 | 2010-10-13 | 华东交通大学 | Multi-target large powder inverter common-mode voltage suppressing method |
| CN103560674A (en) * | 2013-10-15 | 2014-02-05 | 南京航空航天大学 | Three-phase three-level LLC resonance direct current converter and control method of three-phase three-level LLC resonance direct current converter |
| CN104883084A (en) * | 2015-05-26 | 2015-09-02 | 清华大学 | Neutral-point clamped cascade H-bridge hybrid multilevel converter |
| CN205945092U (en) * | 2016-07-22 | 2017-02-08 | 国网河南省电力公司平顶山供电公司 | Distributed generator circuit that is incorporated into power networks based on mix many level converter |
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| CN101860319A (en) * | 2010-06-01 | 2010-10-13 | 华东交通大学 | Multi-target large powder inverter common-mode voltage suppressing method |
| CN103560674A (en) * | 2013-10-15 | 2014-02-05 | 南京航空航天大学 | Three-phase three-level LLC resonance direct current converter and control method of three-phase three-level LLC resonance direct current converter |
| CN104883084A (en) * | 2015-05-26 | 2015-09-02 | 清华大学 | Neutral-point clamped cascade H-bridge hybrid multilevel converter |
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