CN105162345B - A kind of four electrical level DC-AC converters of direct-current micro-grid - Google Patents
A kind of four electrical level DC-AC converters of direct-current micro-grid Download PDFInfo
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- CN105162345B CN105162345B CN201510590812.0A CN201510590812A CN105162345B CN 105162345 B CN105162345 B CN 105162345B CN 201510590812 A CN201510590812 A CN 201510590812A CN 105162345 B CN105162345 B CN 105162345B
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Abstract
The invention discloses a kind of four electrical level DC-AC converters of direct-current micro-grid comprising: one or more bridge arm units, each bridge arm unit include three level bridge arm of a T-type and two power tubes；Wherein: the both ends of three level bridge arm of T-type are separately connected a power tube；When the quantity of bridge arm unit is multiple, bridge arm unit is connected in parallel.Direct-current micro-grid of the invention simplifies the structure of converter with four level DC-ACA converters, reduces conduction loss.
Description
Technical field
The present invention relates to electric electronic current change technology field, in particular to a kind of direct-current micro-grid is converted with four level DC-AC
Device.
Background technique
Micro-capacitance sensor refers to by distributed generation resource, energy storage device, energy conversion device, associated loadings and monitoring, protective device
Small-sized electric system made of collecting, being one can be realized self-contr ol, protection and the autonomous system of management, both can be with
External electrical network is incorporated into the power networks, can also be with isolated operation.What is transmitted in a manner of direct current is just direct-current grid.
For direct-current micro-grid higher for busbar voltage, three-level inverter can not be met the requirements well,
Because if the stress levels of device are very high at this time using three-level topology, therefore the power tube type selecting under three-level topology
It has difficulties.
Chinese Patent Application No. is CN201310177370.8, which proposes a kind of micro- suitable for high voltage direct current
Four switch three lever DC converters of net, output electric current still contain biggish harmonic content.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, proposes that a kind of direct-current micro-grid is converted with four level DC-AC
Device, can effectively reduce the conduction loss of traditional four level converters, while simplify transformer configuration.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
The present invention provides a kind of direct-current micro-grid four electrical level DC-AC converters comprising: one or more bridge arm units,
Each bridge arm unit includes three level bridge arm of a T-type and two power tubes；Wherein:
The both ends of the three level bridge arm of T-type are separately connected a power tube；
When the quantity of the bridge arm unit is multiple, the bridge arm unit is connected in parallel.
Preferably, the quantity of the bridge arm unit is three.
Preferably, the converter is connected with a CPU.
It is connected preferably, the CPU is controlled by PWM with the converter.
Compared with prior art, the invention has the following advantages:
(1) four electrical level DC-AC converters of direct-current micro-grid provided by the invention, it is two extraneous by T-type three-level topology
Power tube constitutes new bridge arm, forms four level topology, expands the scope of application of circuit pressure resistance, increase output-voltage levels
Number, it is easier to realize mutually compensating for harmonic wave, output waveform is made to be greatly improved；
(2) for the present invention in output+Vdc/6 and-Vdc/6, electric current need to only flow through 2 power tubes, and conduction loss subtracts significantly
It is small, improve the efficiency of transmission of system；
(3) compared with traditional converter, converter of the invention only needs 6 IGBT, and number of devices tails off, not only
Structure is simplified, also converter is easier to control, to increase the stability of system.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of the bridge arm unit of existing DC-AC converter；
Fig. 2 is the structural schematic diagram of existing four electrical level DC-AC converter；
Fig. 3 a is the state diagram when switch of existing four electrical level DC-AC converter is in 111000；
Fig. 3 b is the state diagram when switch of existing four electrical level DC-AC converter is in 011001；
Fig. 3 c is the state diagram when switch of existing four electrical level DC-AC converter is in 101100；
Fig. 3 d is the state diagram when switch of existing four electrical level DC-AC converter is in 001101；
Fig. 3 e is the state diagram when switch of existing four electrical level DC-AC converter is in 100110；
Fig. 3 f is the state diagram when switch of existing four electrical level DC-AC converter is in 000111；
Fig. 4 is the structural schematic diagram of the bridge arm unit of four electrical level DC-AC converters of the invention；
Fig. 5 is the structural schematic diagram of four electrical level DC-AC converters of the invention；
Fig. 6 a is the state diagram when switch of four electrical level DC-AC converters of the invention is in 110001；
Fig. 6 b is the state diagram when switch of four electrical level DC-AC converters of the invention is in 100011；
Fig. 6 c is the state diagram when switch of four electrical level DC-AC converters of the invention is in 010100；
Fig. 6 d is the state diagram when switch of four electrical level DC-AC converters of the invention is in 000111；
Fig. 6 e is the state diagram when switch of four electrical level DC-AC converters of the invention is in 101000；
Fig. 6 f is the state diagram when switch of four electrical level DC-AC converters of the invention is in 001101；
Fig. 7 is the structural schematic diagram of four electrical level DC-AC converters of presently preferred embodiments of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
It is as shown in Figure 1 four traditional level DC-AC inverters, the three-phase inverter formed using existing bridge arm unit
Structural schematic diagram it is as shown in Figure 2；Table 1 show its switch combination and output voltage, the corresponding state of each switch combination
Figure is respectively Fig. 3 a, 3b, 3c, 3d, 3e, 3f.
Table 1
It can be seen that 4 traditional electrical level DC-AC converters electric current in output+- Vdc/2 from Fig. 2 and Fig. 3 a- Fig. 3 f to want
3 power tubes are flowed through, will cause very big conduction loss.Four traditional simultaneously electrical level DC-AC converter devices are more, Mei Geqiao
Arm shares 6 IGBT and 2 diodes.
The bridge arm unit of four electrical level DC-AC converters of the invention is to be separately connected one at the both ends of three level bridge arm of T-type
Power tube, structural schematic diagram as shown in figure 4, the three-phase inverter that is made of the bridge arm unit as shown in figure 5, bridge arm unit it
Between it is parallel with one another.
As shown in figure 4, the topology of one embodiment of the invention by four capacitors C1, C2, C3, C4 and six switching tube S1, S2,
S3, S4, S5, S6 are constituted.
As shown in figure 4, node 1 connects the drain electrode of the anode and S1 of C1；Node 2 connects the cathode of C2 and the source electrode of S4；Section
Point 3 connects the anode of the drain electrode of the source electrode, S2 of S1, C3；Node 4 connects the source electrode of the cathode of C3, the anode of C4, S5；Node 5 connects
Connect the drain electrode of the source electrode of S2, the source electrode of S6, S3；Node 6 connects the cathode of the drain electrode of the source electrode, S4 of S3, C4.
As shown in figure 5, being the implementation for the DC-AC converter that above topology is applied to output three-phase alternating current.This becomes
Parallel operation is made of three four level bridge arms and two capacitors C1, C2 as shown in Figure 4.
As shown in figure 5, node 1 connects the drain electrode of tri- switching tubes of S1a, S1b, S1c and the anode of C1；Node 2 connects
The source electrode of tri- switching tubes of S4a, S4b, S4c and the cathode of C2.
Table 2 is its switch combination and output voltage, the corresponding state diagram of each switch combination be respectively Fig. 6 a, 6b, 6c,
6d、6e、6f。
Table 2
As shown in table 2, when converter output level is Vdc/2, (as shown in Figure 6 a) is connected in switching tube S1, S2, S6, special
Not, when current direction is reversed (Fig. 4 interior joint 5 flows to node 1), electric current circulates from the body diode of S1, S2；Work as transformation
When device output level is Vdc/6, (as shown in Figure 6 b) is connected in switching tube S1, S5, S6, particularly, when current direction is reversed, electricity
Stream circulates from the body diode of the body diode of S6, S5, capacitor and S1；When converter output level is Vdc/6, in addition one
It kind is achieved in that, S2, S4 circulate (as fig. 6 c), and particularly, when current direction is reversed, electric current is from two pole of body of S2
Pipe, capacitor circulate in S4；When converter output level is-Vdc/6, (as shown in fig 6d) is connected in switching tube S4, S5, S6, special
Not, when current direction is reversed, electric current circulates from the body diode of S6, S5, capacitor and S4；When converter output level
When for-Vdc/6, another is achieved in that, S1, S3 circulate (as shown in fig 6e), particularly, when current direction is reversed,
Electric current from S6, capacitor, S1 body diode in circulate；When converter output level is-Vdc/2, switching tube S3, S4, S6 are led
Logical (as shown in Figure 6 f), particularly, when current direction is reversed, electric current circulates from S3, S4；
From Table 2, it can be seen that the converter of the present embodiment is in output+Vdc/6 and when-Vdc/6, i.e. Fig. 6 c and Fig. 6 e institute
Show, electric current need to only flow through 2 power tubes；When output+Vdc level, two power tubes of S2 and S4 need to be only opened；When defeated
Out when-Vdc level, two power tubes of S1 and S3 need to be only opened.From the above analysis, with four traditional level converters
It compares, the conduction loss of the converter of the present embodiment greatly reduces.
Meanwhile compared with traditional converter, the converter number of devices of the present embodiment reduces, it is only necessary to 6 IGBT
, this is easier to control the topology, increases the stability of system；Conduction loss is decreased simultaneously, so that system
Efficiency of transmission get higher.
In preferred embodiment, converter is connected with a CPU, and CPU controls the worked of parallel operation by PWM control technology
Journey is illustrated in figure 7 its schematic diagram, in this way, convertor controls more automatic intelligent.
Disclosed herein is merely a preferred embodiment of the present invention, these embodiments are chosen and specifically described to this specification, is
Principle and practical application in order to better explain the present invention is not limitation of the invention.Anyone skilled in the art
The modifications and variations done within the scope of specification should all be fallen in the range of of the invention protect.
Claims (5)
1. a kind of four electrical level DC-AC converters of direct-current micro-grid characterized by comprising one or more bridge arm units, each
The bridge arm unit is made of three level bridge arm of a T-type, two power tube S1, S4 and two capacitor C3, C4；Wherein: three electricity of T-type
The both ends of level bridge arm are separately connected the first power tube S1, the second power tube S4；
When four electrical level DC-AC converter includes a bridge arm unit, wherein four switching tubes S2, S3, S5, S6 constitute T
Three level bridge arm of type, node 1 connect the drain electrode of the anode and S1 of capacitor C1；Node 2 connects the cathode of capacitor C2 and the source electrode of S4；
Node 3 connects the anode of the drain electrode of the source electrode, S2 of S1, capacitor C3；Node 4 connects the cathode of capacitor C3, the anode of capacitor C4, S5
Source electrode；The drain electrode of node 5 the connection source electrode of S2, the source electrode of S6, S3；Node 6 connects the drain electrode of the source electrode, S4 of S3, capacitor C4
Cathode；The drain electrode of the drain electrode connection S6 of S5, the plus earth of the cathode, capacitor C2 of capacitor C1；
When the quantity of the bridge arm unit is multiple, the bridge arm unit is connected in parallel, and node 1 connects more the first power tubes
Drain electrode and capacitor C1 anode；Node 2 connects the source electrode of more the second power tubes and the cathode of capacitor C2.
2. four electrical level DC-AC converters of direct-current micro-grid according to claim 1, which is characterized in that the bridge arm unit
Quantity be three.
3. four electrical level DC-AC converters of direct-current micro-grid according to claim 1, which is characterized in that the converter with
One CPU is connected.
4. four electrical level DC-AC converters of direct-current micro-grid according to claim 3, which is characterized in that the CPU passes through
PWM control is connected with the converter.
5. four electrical level DC-AC converters of direct-current micro-grid according to claim 1-4, which is characterized in that
When converter output level is Vdc/2, switching tube S1, S2, S6 conducting, when current direction is reversed, that is, flow direction of node 5
Node 1, electric current circulate from the body diode of S1, S2；
When converter output level is Vdc/6, switching tube S1, S5, S6 conducting, when current direction is reversed, electric current is from S6's
Body diode, S5, capacitor C3 and S1 body diode in circulate；When converter output level is Vdc/6, another realization
Mode is that S2, S4 circulation, when current direction is reversed, electric current circulates from the body diode, capacitor C3, capacitor C4, S4 of S2；
When converter output level is-Vdc/6, switching tube S4, S5, S6 conducting, when current direction is reversed, electric current is from S6's
Body diode, S5, it circulates in capacitor C4 and S4；When converter output level is-Vdc/6, another is achieved in that,
S1, S3 circulation, when current direction is reversed, electric current from S3, capacitor C4, capacitor C3, S1 body diode in circulate；
When converter output level be-Vdc/2 when, switching tube S3, S4, S6 conducting, when current direction is reversed, electric current from S3,
It circulates in S4；
For the converter in output+Vdc/6 and-Vdc/6, electric current need to only flow through 2 power tubes；When output+Vdc level
It waits, need to only open two power tubes of S2 and S4；When output-Vdc level, two power tubes of S1 and S3 need to be only opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510590812.0A CN105162345B (en) | 2015-09-16 | 2015-09-16 | A kind of four electrical level DC-AC converters of direct-current micro-grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510590812.0A CN105162345B (en) | 2015-09-16 | 2015-09-16 | A kind of four electrical level DC-AC converters of direct-current micro-grid |
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| CN105162345B true CN105162345B (en) | 2019-01-25 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107634672B (en) * | 2017-09-30 | 2019-09-06 | 中国矿业大学 | Four level converters of one kind and its control method |
| CN115313890A (en) * | 2022-07-14 | 2022-11-08 | 江苏科曜能源科技有限公司 | Single-phase active clamping T-type 17-level inverter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937493U (en) * | 2011-01-14 | 2011-08-17 | 南京师范大学 | Four-level inverter |
| CN102570881A (en) * | 2012-02-20 | 2012-07-11 | 阳光电源股份有限公司 | Four-level topology unit and application circuit thereof |
| CN102594185A (en) * | 2012-02-20 | 2012-07-18 | 阳光电源股份有限公司 | Four-level topology unit and application circuit thereof |
| CN104079196A (en) * | 2013-03-29 | 2014-10-01 | 通用电气能源能量变换技术有限公司 | Voltage balancing system and method for multilevel converters |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10131961A1 (en) * | 2001-07-02 | 2003-01-23 | Siemens Ag | N-point converter circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937493U (en) * | 2011-01-14 | 2011-08-17 | 南京师范大学 | Four-level inverter |
| CN102570881A (en) * | 2012-02-20 | 2012-07-11 | 阳光电源股份有限公司 | Four-level topology unit and application circuit thereof |
| CN102594185A (en) * | 2012-02-20 | 2012-07-18 | 阳光电源股份有限公司 | Four-level topology unit and application circuit thereof |
| CN104079196A (en) * | 2013-03-29 | 2014-10-01 | 通用电气能源能量变换技术有限公司 | Voltage balancing system and method for multilevel converters |
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