CN104601023A - Three phase SEPIC buck-boost type three level inverter - Google Patents

Three phase SEPIC buck-boost type three level inverter Download PDF

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Publication number
CN104601023A
CN104601023A CN201510020445.0A CN201510020445A CN104601023A CN 104601023 A CN104601023 A CN 104601023A CN 201510020445 A CN201510020445 A CN 201510020445A CN 104601023 A CN104601023 A CN 104601023A
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China
Prior art keywords
electric capacity
switching tube
inductance
bus
phase
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CN201510020445.0A
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Chinese (zh)
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CN104601023B (en
Inventor
郭小强
李建
贾晓瑜
王小宇
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HEBEI SHENKE ELECTRIC POWER CO.,LTD.
HEBEI SHENKE ELECTRONICS Co.,Ltd.
Hebei Shenke Intelligent Manufacturing Co.,Ltd.
Hebei Shenke magnetic materials Co.,Ltd.
Hebei Shenke mould Co.,Ltd.
Shenke Technology Group Co.,Ltd.
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Yanshan University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/1557—Single ended primary inductor converters [SEPIC]

Abstract

The invention discloses a three phase SEPIC buck-boost type three level inverter. The three phase SEPIC buck-boost type three level inverter is characterized in that a circuit type of the three phase SEPIC buck-boost type three level inverter comprises a direct current bus, a switch tube, an electric inductor and a capacitor. The three phase SEPIC buck-boost type three level inverter has the advantages of being used in a buck-boost type occasion under the circumstance that a transformer or a forestage direct current convertor is not needed, small in size, high in efficiency, low in cost, capable of achieving the purpose that amplitude of output voltage is larger than or less than amplitude of input voltage, large in output voltage range, and high in maximum direct current voltage utilization ratio, needing low direct current bus voltage under the circumstance of meeting the same three phase load or the same three phase grid demands as a traditional buck-boost type inverter, having common mode rejection ability, and being suitable for a middle and high voltage occasion due to the fact that voltage stress of the switch tube is one half of a traditional buck-boost type inverter such as a three phase SEPIC inverter.

Description

A kind of three-phase Sepic buck-boost type three-level inverter
Technical field
The present invention relates to the inverter of converters technical field, particularly relate to a kind of three-phase Sepic buck-boost type three-level inverter.
Background technology
Inverter is as a kind of power electronic equipment, and its basic role converts direct-current input power supplying to AC power, meets the burden requirement of load or electrical network.Wherein single-phase inverter is mainly used in middle low power occasion, and structure is simple, cost is lower; And three-phase inverter is due to its design feature, be applicable to more large-power occasions, be widely used in the various industrial occasions such as grid-connected, motor driving, airplane power source.
Tradition three-phase inverter mainly comprise the topologys such as three-phase semi-bridge type two-level inverter topology, three-phase neutral-point-clamped type three-level inverter, its common feature be output voltage amplitude lower than input voltage, belong to voltage-dropping type inverter.And above-mentioned voltage-dropping type inverter generally needs DC bus-bar voltage to be more than or equal to output AC voltage amplitude doubly, is only applicable to being applied in ac output voltage amplitude and is less than or equal to the voltage-dropping type occasion of times DC input voitage amplitude; In practical application, in the occasion complicated at loading condition, output voltage amplitude claimed range is large, especially in buck occasion, inverter needs connection transformer or prime DC converter, carrys out regulation output voltage magnitude, meets the different voltage requirements of threephase load or electrical network.But the access of transformer or prime DC converter also can cause the problems such as the increase of inverter volume, cost increase, energy conversion efficiency reduction.Simultaneously, inverter without transformer is in application process, switching tube high frequency break-make also causes powder inverter common-mode voltage high frequency to change, in the multiple commercial Application such as grid-connected, motor driving, cause common mode problem, influential system safe and reliable operation, even threatens personal safety.Thus, need Three phase voltage boosting/reducing inverter badly to solve the problem.
Chinese Patent Application No. 201410020413.6, name is called the non-isolated grid-connected electricity generation system of single-stage boost inverter and control method thereof, this patent application proposes a kind of photovoltaic DC-to-AC converter, coupling inductance passive network is introduced on the basis of traditional three-phase semi-bridge type two-level inverter the power supply of inverter and main circuit are coupled, in conjunction with the control program that it is announced, while realizing boost function, suppress common mode current.But the inverter scheme that this application case proposes belongs to two-level inverter, limit its application in high voltage appearance occasion.In the article Afour-switch three-phase SEPIC-based inverter that people such as Diab M.S 2014 deliver at IEEE Transactions on Power Electronics, a kind of two-level inverter based on Sepic DC converter is proposed, namely four switching tubes only applied by this inverter can realize three-phase alternating current output, and possesses common mode inhibition capacity.But this inverter output voltage amplitude is limited in below DC input voitage amplitude, still belongs to voltage-dropping type inverter; And this inverter belongs to two-level inverter, limit its application in high voltage appearance occasion.
Summary of the invention
In order to solve above-mentioned Problems existing, the object of the present invention is to provide a kind of output voltage range large, buck applied field can be applicable to merge the three-phase buck-boost type three-level inverter possessing common mode inhibition capacity.
In order to realize foregoing invention object, the present invention adopts following technical scheme: a kind of three-phase Sepic buck-boost type three-level inverter, and it comprises DC bus, 12 switching tubes, six inductance and nine electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected; First electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected; Second inductance L 2the other end hold with the N of DC bus and be connected; Second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected; 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected; 4th switching tube S 4the other end hold with the N of DC bus and be connected; First switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected; 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected; 4th inductance L 4the other end hold with the N of DC bus and be connected; 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected; 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected; 8th switching tube S 8the other end hold with the N of DC bus and be connected; 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected; 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected; 6th inductance L 6the other end hold with the N of DC bus and be connected; Tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected; 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected; Twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected; 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
Further, on the basis of a kind of three-phase Sepic buck-boost type three-level inverter of the present invention's proposition, take the improvement of one of following two measures, to strengthen common mode inhibition capacity:
(1) by the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9tie point M hold with the N of DC bus and be connected;
(2) access between the P end of DC bus is held with N connect first suppress electric capacity C t1electric capacity C is suppressed with second t2, first suppresses electric capacity C t1electric capacity C is suppressed with second t2be connected to a H, suppress electric capacity C by first t1, second suppress electric capacity C t2tie point H and the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9tie point M be connected.
On the basis of a kind of three-phase Sepic buck-boost type three-level inverter of the present invention's proposition, or a kind of three-phase Sepic buck-boost type three-level inverter proposed in the present invention and take to strengthen on the basis of common mode inhibition capacity measure (1), take one of following two measures to reduce contactor pipe quantity:
(3) between the P end of DC bus is held with N, the first derided capacitors C connected is accessed n1with the second derided capacitors C n2, the first derided capacitors C n1with the second derided capacitors C n2be connected to J point, substitute wherein any corresponding inductance, electric capacity and switching tube, and the first derided capacitors C is received in this corresponding load or electrical network n1with the second derided capacitors C n2tie point J; A phase comprises: the first inductance L 1with the second inductance L 2, the first electric capacity C 1with the second electric capacity C 2, the first switching tube S 1, second switch pipe S 2, the 3rd switching tube S 3with the 4th switching tube S 4; B phase comprises: the 3rd inductance L 3with the 4th inductance L 4, the 3rd electric capacity C 3with the 4th electric capacity C 4, the 5th switching tube S 5, the 6th switching tube S 6, the 7th switching tube S 7with the 8th switching tube S 8; C phase comprises: the 5th inductance L 5with the 6th inductance L 6, the 5th electric capacity C 5with the 6th electric capacity C 6, the 9th switching tube S 9, the tenth switching tube S 10, the 11 switching tube S 11pipe S is closed with twelvemo 12.
(4) any corresponding inductance, electric capacity and switching tube is removed, and DC bus P is received in this corresponding load or electrical network hold; A phase comprises: the first inductance L 1with the second inductance L 2, the first electric capacity C 1with the second electric capacity C 2, the first switching tube S 1, second switch pipe S 2, the 3rd switching tube S 3with the 4th switching tube S 4; B phase comprises: the 3rd inductance L 3with the 4th inductance L 4, the 3rd electric capacity C 3with the 4th electric capacity C 4, the 5th switching tube S 5, the 6th switching tube S 6, the 7th switching tube S 7with the 8th switching tube S 8; C phase comprises: the 5th inductance L 5with the 6th inductance L 6, the 5th electric capacity C 5with the 6th electric capacity C 6, the 9th switching tube S 9, the tenth switching tube S 10, the 11 switching tube S 11pipe S is closed with twelvemo 12.
Owing to adopting technique scheme, compared with prior art, the invention has the beneficial effects as follows:
1, compared with traditional three-phase inverter, the inverter that the present invention proposes can when being applied to buck-boost type occasion without the need to when transformer or prime DC converter, and volume is little, efficiency is high, cost is low;
2, compared with traditional three-phase inverter, the inverter that the present invention proposes belongs to voltage boosting/reducing inverter, and can realize output voltage amplitude and be greater than or less than input voltage amplitude, output voltage range is large.Maximum direct voltage utilance is high, and meet same threephase load or three phase network requirement, required DC bus-bar voltage is low;
3, compared with traditional three-phase inverter, the inverter that the present invention proposes possesses common mode inhibition capacity;
4, compared with three-phase Sepic type two-level inverter, the inverter that the present invention proposes is three-level inverter, and switch tube voltage stress is the half of traditional buck-boost inverter such as three-phase Sepic type two-level inverter, is more suitable for being applied to high voltage appearance occasion.
Accompanying drawing explanation
The circuit theory diagrams that Fig. 1 is a kind of three-phase Sepic buck-boost type three-level inverter of proposing of the present invention under the N of a M and DC bus holds non-connection;
The circuit theory diagrams that Fig. 2 is a kind of three-phase Sepic buck-boost type three-level inverter of proposing of the present invention under the N of a M and DC bus holds connection;
Fig. 3 be access between the P end of a kind of three-phase Sepic buck-boost type three-level inverter of proposing of the present invention at DC bus is held with N connect first suppress electric capacity C t1electric capacity C is suppressed with second t2, first suppresses electric capacity C t1electric capacity C is suppressed with second t2be connected to H point, suppress electric capacity C by first t1, second suppress electric capacity C t2tie point H and the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9the circuit theory diagrams that are connected in situation of tie point M;
Fig. 4 accesses the first derided capacitors C connected between the P end of a kind of three-phase Sepic buck-boost type three-level inverter of proposing of the present invention at DC bus is held with N n1with the second derided capacitors C n2, the first derided capacitors C n1with the second derided capacitors C n2be connected to a J, substitute inductance, electric capacity and switching tube that wherein A is corresponding, and the first derided capacitors C is received in this corresponding load or electrical network n1with the second derided capacitors C n2tie point J, and the N of electric capacity mid point M and DC bus holds the circuit theory diagrams under non-connection;
Fig. 5 accesses the first derided capacitors C connected between the P end of a kind of three-phase Sepic buck-boost type three-level inverter of proposing of the present invention at DC bus is held with N n1with the second derided capacitors C n2, the first derided capacitors C n1with the second derided capacitors C n2be connected to a J, substitute inductance, electric capacity and switching tube that wherein A is corresponding, and the first derided capacitors C is received in this corresponding load or electrical network n1with the second derided capacitors C n2tie point J, and the N of electric capacity mid point M and DC bus holds the circuit theory diagrams under connection;
Fig. 6 is that inductance corresponding for wherein A, electric capacity and switching tube remove by a kind of three-phase Sepic buck-boost type three-level inverter that the present invention proposes, and this corresponding load or electrical network are received DC bus P end and the N of electric capacity mid point M and DC bus holds the circuit theory diagrams under non-connection;
Fig. 7 is that inductance corresponding for wherein A, electric capacity and switching tube remove by a kind of three-phase Sepic buck-boost type three-level inverter that the present invention proposes, and this corresponding load or electrical network is received the P end of DC bus and the N of electric capacity mid point M and DC bus holds the circuit theory diagrams under connection.
Embodiment
Below in conjunction with accompanying drawing, specific description is in detail done further to the specific embodiment of the present invention.
In a kind of three-phase Sepic buck-boost type three-level inverter that the present invention shown in Fig. 1 proposes, this inverter comprises DC bus, 12 switching tubes, six inductance and nine electric capacity as we can see from the figure;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end, the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
In fact, a kind of three-phase Sepic buck-boost type three-level inverter that the present invention proposes is on three-phase Sepic type two-level inverter basis, the tri-level circuit form utilizing striding capacitance to construct.The inverter that the present invention proposes is large at the traditional three-phase Sepic type two-level inverter output AC voltage amplitude range of maintenance, while DC input voitage amplitude feature can be greater than or less than, the voltage stress that switching tube bears is only the half of traditional three-phase Sepic type two-level inverter, is more applicable for high voltage appearance occasion.
On the basis of a kind of three-phase Sepic buck-boost type three-level inverter of the present invention's proposition, as required, the improvement of one of following two measures can also be taked, to strengthen common mode inhibition capacity:
(1) by the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9tie point M hold with the N of DC bus and be connected, as shown in Figure 2;
(2) access between the P end of DC bus is held with N connect first suppress electric capacity C t1electric capacity C is suppressed with second t2, first suppresses electric capacity C t1electric capacity C is suppressed with second t2be connected to a H, suppress electric capacity C by first t1, second suppress electric capacity C t2tie point H and the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9tie point M be connected, as shown in Figure 3.
On the basis of a kind of three-phase Sepic buck-boost type three-level inverter of the present invention's proposition, or the present invention propose a kind of three-phase Sepic buck-boost type three-level inverter and take strengthen common mode inhibition capacity measure (1) basis on, as required, one of following two measures can also be taked to reduce contactor pipe quantity:
(3) between DC bus P end is held with N, the first derided capacitors C connected is accessed n1with the second derided capacitors C n2, the first derided capacitors C n1with the second derided capacitors C n2be connected to a J, substitute wherein any corresponding inductance, electric capacity and switching tube, and the first derided capacitors C is received in this corresponding load or electrical network n1with the second derided capacitors C n2tie point J; A phase comprises: the first inductance L 1with the second inductance L 2, the first electric capacity C 1with the second electric capacity C 2, the first switching tube S 1, second switch pipe S 2, the 3rd switching tube S 3with the 4th switching tube S 4; B phase comprises: the 3rd inductance L 3with the 4th inductance L 4, the 3rd electric capacity C 3with the 4th electric capacity C 4, the 5th switching tube S 5, the 6th switching tube S 6, the 7th switching tube S 7with the 8th switching tube S 8; C phase comprises: the 5th inductance L 5with the 6th inductance L 6, the 5th electric capacity C 5with the 6th electric capacity C 6, the 9th switching tube S 9, the tenth switching tube S 10, the 11 switching tube S 11pipe S is closed with twelvemo 12.
Below in conjunction with Fig. 4, (3) are taken measures on the basis of a kind of three-phase Sepic buck-boost type three-level inverter of the present invention's proposition, to remove A phase, the technical scheme after its improvement are described:
1), in a kind of three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and nine electric capacity;
The first derided capacitors C of P end by connecting of DC bus n1with the second derided capacitors C n2connect the N end of DC bus, the first derided capacitors C n1with the second derided capacitors C n2tie point J and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
In like manner, (3) are taken measures on the basis of a kind of three-phase Sepic buck-boost type three-level inverter proposed in the present invention, and it is 2 that alternative B phase improves rear technical scheme), substituting C phase, to improve rear technical scheme be 3):
2) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and nine electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The first derided capacitors C of P end by connecting of DC bus n1with the second derided capacitors C n2connect the N end of DC bus, the first derided capacitors C n1with the second derided capacitors C n2tie point J and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
3) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and nine electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The first derided capacitors C of P end by connecting of DC bus n1with the second derided capacitors C n2connect the N end of DC bus, the first derided capacitors C n1with the second derided capacitors C n2tie point J and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
Below in conjunction with Fig. 5, the present invention propose a kind of three-phase Sepic buck-boost type three-level inverter basis on and take strengthen common mode inhibition capacity measure (1) basis on, take measures (3) substitute A phase illustrate its improve after technical scheme:
4) a three-phase Sepic buck-boost type three-level inverter, as shown in Figure 5, it comprises DC bus, eight switching tubes, four inductance and nine electric capacity;
The first derided capacitors C of P end by connecting of DC bus n1with the second derided capacitors C n2connect the N end of DC bus, the first derided capacitors C n1with the second derided capacitors C n2tie point J and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, and electric capacity mid point M holds with DC bus N and is connected, and threephase load or three phase network are connected to an O.
In like manner, the present invention propose a kind of three-phase Sepic buck-boost type three-level inverter basis on and take strengthen common mode inhibition capacity measure (1) basis on take measures (3) substitute B phase improve after technical scheme be respectively 5), alternative C phase improve after technical scheme 6):
5) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and nine electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The first derided capacitors C of P end by connecting of DC bus n1with the second derided capacitors C n2connect the N end of DC bus, the first derided capacitors C n1with the second derided capacitors C n2tie point J and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, and electric capacity mid point M holds with DC bus N and is connected, and threephase load or three phase network are connected to an O.
6) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and nine electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The first derided capacitors C of P end by connecting of DC bus n1with the second derided capacitors C n2connect the N end of DC bus, the first derided capacitors C n1with the second derided capacitors C n2tie point J and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, and electric capacity mid point M holds with DC bus N and is connected, and threephase load or three phase network are connected to an O.
(4) any corresponding inductance, electric capacity and switching tube is removed, and DC bus P is received in this corresponding load or electrical network hold; A phase comprises: the first inductance L 1with the second inductance L 2, the first electric capacity C 1with the second electric capacity C 2, the first switching tube S 1, second switch pipe S 2, the 3rd switching tube S 3with the 4th switching tube S 4; B phase comprises: the 3rd inductance L 3with the 4th inductance L 4, the 3rd electric capacity C 3with the 4th electric capacity C 4, the 5th switching tube S 5, the 6th switching tube S 6, the 7th switching tube S 7with the 8th switching tube S 8; C phase comprises: the 5th inductance L 5with the 6th inductance L 6, the 5th electric capacity C 5with the 6th electric capacity C 6, the 9th switching tube S 9, the tenth switching tube S 10, the 11 switching tube S 11pipe S is closed with twelvemo 12.
Below in conjunction with Fig. 6, the present invention propose a kind of three-phase Sepic buck-boost type three-level inverter basis on take measures (4), with remove A phase illustrate its improve after technical scheme:
7) a three-phase Sepic buck-boost type three-level inverter, as shown in Figure 6, it comprises DC bus, eight switching tubes, four inductance and seven electric capacity;
P end and the 7th electric capacity C of DC bus 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
In like manner, (4) are taken measures on the basis of a kind of three-phase Sepic buck-boost type three-level inverter proposed in the present invention, and removing B phase, to improve rear technical scheme be 8), removing C phase, to improve rear technical scheme be 9):
8) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and seven electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
P end and the 8th electric capacity C of DC bus 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
9) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and seven electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
P end and the 9th electric capacity C of DC bus 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
Below in conjunction with Fig. 7, the present invention propose a kind of three-phase Sepic buck-boost type three-level inverter and take strengthen common mode inhibition capacity measure (1) basis on take measures (4), with remove A phase illustrate its improve after technical scheme:
10) a three-phase Sepic buck-boost type three-level inverter, as shown in Figure 7, it comprises DC bus, eight switching tubes, four inductance and seven electric capacity;
P end and the 7th electric capacity C of DC bus 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, and electric capacity mid point M holds with DC bus N and is connected, and threephase load or three phase network are connected to an O.
In like manner, 11 are respectively with technical scheme after the improvement removing B phase and C phase) and 12):
11) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and seven electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
P end and the 8th electric capacity C of DC bus 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected, the 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected, the 6th inductance L 6the other end hold with the N of DC bus and be connected, the tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected, the 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected, twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected, the 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, and electric capacity mid point M holds with DC bus N and is connected, and threephase load or three phase network are connected to an O.
12) a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, eight switching tubes, four inductance and seven electric capacity;
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected, the first electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected, the second inductance L 2the other end hold with the N of DC bus and be connected, second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected, the 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected, the 4th switching tube S 4the other end hold with the N of DC bus and be connected, the first switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected, the 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected, the 4th inductance L 4the other end hold with the N of DC bus and be connected, the 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected, the 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected, the 8th switching tube S 8the other end hold with the N of DC bus and be connected, the 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
P end and the 9th electric capacity C of DC bus 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, and electric capacity mid point M holds with DC bus N and is connected, and threephase load or three phase network are connected to an O.

Claims (5)

1. a three-phase Sepic buck-boost type three-level inverter, it comprises DC bus, 12 switching tubes, six inductance and nine electric capacity; It is characterized in that:
The P end of DC bus is by the first inductance L 1with the first electric capacity C 1one end, the 3rd switching tube S 3one end be connected; First electric capacity C 1the other end and the second inductance L 2one end, second switch pipe S 2one end be connected; Second inductance L 2the other end hold with the N of DC bus and be connected; Second switch pipe S 2the other end and the first switching tube S 1one end, the second electric capacity C 2one end be connected; 3rd switching tube S 3the other end and the 4th switching tube S 4one end, the second electric capacity C 2the other end be connected; 4th switching tube S 4the other end hold with the N of DC bus and be connected; First switching tube S 1the other end and the 7th electric capacity C 7one end, threephase load or three phase network A be connected to an A;
The P end of DC bus is by the 3rd inductance L 3with the 3rd electric capacity C 3one end, the 7th switching tube S 7one end be connected; 3rd electric capacity C 3the other end and the 4th inductance L 4one end, the 6th switching tube S 6one end be connected; 4th inductance L 4the other end hold with the N of DC bus and be connected; 6th switching tube S 6the other end and the 5th switching tube S 5one end, the 4th electric capacity C 4one end be connected; 7th switching tube S 7the other end and the 8th switching tube S 8one end, the 4th electric capacity C 4the other end be connected; 8th switching tube S 8the other end hold with the N of DC bus and be connected; 5th switching tube S 5the other end and the 8th electric capacity C 8one end, threephase load or three phase network B be connected to a B;
The P end of DC bus is by the 5th inductance L 5with the 5th electric capacity C 5one end, the 11 switching tube S 11one end be connected; 5th electric capacity C 5the other end and the 6th inductance L 6one end, the tenth switching tube S 10one end be connected; 6th inductance L 6the other end hold with the N of DC bus and be connected; Tenth switching tube S 10the other end and the 9th switching tube S 9one end, the 6th electric capacity C 6one end be connected; 11 switching tube S 11the other end and twelvemo close pipe S 12one end, the 6th electric capacity C 6the other end be connected; Twelvemo closes pipe S 12the other end hold with the N of DC bus and be connected; 9th switching tube S 9the other end and the 9th electric capacity C 9one end, threephase load or three phase network C be connected to a C;
7th electric capacity C 7the other end, the 8th electric capacity C 8the other end and the 9th electric capacity C 9the other end be connected to a M, threephase load or three phase network are connected to an O.
2. a kind of three-phase Sepic buck-boost type three-level inverter according to claim 1, is characterized in that: the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9tie point M hold with the N of DC bus and be connected.
3. a kind of three-phase Sepic buck-boost type three-level inverter according to claim 1, is characterized in that: access between the P end of DC bus is held with N connect first suppress electric capacity C t1electric capacity C is suppressed with second t2, first suppresses electric capacity C t1electric capacity C is suppressed with second t2be connected to a H, suppress electric capacity C by first t1, second suppress electric capacity C t2tie point H and the 7th electric capacity C 7, the 8th electric capacity C 8with the 9th electric capacity C 9tie point M be connected.
4. a kind of three-phase Sepic buck-boost type three-level inverter according to claim 1 and 2, is characterized in that: between DC bus P end is held with N, access the first derided capacitors C connected n1with the second derided capacitors C n2, the first derided capacitors C n1with the second derided capacitors C n2be connected to J point, substitute wherein any corresponding inductance, electric capacity and switching tube, and the first derided capacitors C is received in this corresponding load or electrical network n1with the second derided capacitors C n2tie point J; A phase comprises: the first inductance L 1with the second inductance L 2, the first electric capacity C 1with the second electric capacity C 2, the first switching tube S 1, second switch pipe S 2, the 3rd switching tube S 3with the 4th switching tube S 4; B phase comprises: the 3rd inductance L 3with the 4th inductance L 4, the 3rd electric capacity C 3with the 4th electric capacity C 4, the 5th switching tube S 5, the 6th switching tube S 6, the 7th switching tube S 7with the 8th switching tube S 8; C phase comprises: the 5th inductance L 5with the 6th inductance L 6, the 5th electric capacity C 5with the 6th electric capacity C 6, the 9th switching tube S 9, the tenth switching tube S 10, the 11 switching tube S 11pipe S is closed with twelvemo 12.
5. a kind of three-phase Sepic buck-boost type three-level inverter according to claim 1 and 2, is characterized in that: removed by any corresponding inductance, electric capacity and switching tube, and DC bus P is received in this corresponding load or electrical network holds; A phase comprises: the first inductance L 1with the second inductance L 2, the first electric capacity C 1with the second electric capacity C 2, the first switching tube S 1, second switch pipe S 2, the 3rd switching tube S 3with the 4th switching tube S 4; B phase comprises: the 3rd inductance L 3with the 4th inductance L 4, the 3rd electric capacity C 3with the 4th electric capacity C 4, the 5th switching tube S 5, the 6th switching tube S 6, the 7th switching tube S 7with the 8th switching tube S 8; C phase comprises: the 5th inductance L 5with the 6th inductance L 6, the 5th electric capacity C 5with the 6th electric capacity C 6, the 9th switching tube S 9, the tenth switching tube S 10, the 11 switching tube S 11pipe S is closed with twelvemo 12.
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