KR101727010B1 - Single-phase seven-level grid-connected inverter - Google Patents

Single-phase seven-level grid-connected inverter Download PDF

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Publication number
KR101727010B1
KR101727010B1 KR1020150136588A KR20150136588A KR101727010B1 KR 101727010 B1 KR101727010 B1 KR 101727010B1 KR 1020150136588 A KR1020150136588 A KR 1020150136588A KR 20150136588 A KR20150136588 A KR 20150136588A KR 101727010 B1 KR101727010 B1 KR 101727010B1
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South Korea
Prior art keywords
switch
level
power
forming
load
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KR1020150136588A
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Korean (ko)
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KR20170037747A (en
Inventor
박성준
레동부
최우석
박진욱
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전남대학교산학협력단
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output

Abstract

The present invention relates to an inverter, and more particularly, to a single-phase seventh-level interconnection inverter capable of converting a power source of a DC link to a seventh level and supplying the same to a load to increase the number of output levels, thereby reducing harmonic distortion. .

Description

Single-phase seven-level grid-connected inverters

The present invention relates to an inverter, and more particularly, to a single-phase seventh-level interconnection inverter capable of converting a power source of a DC link to a seventh level and supplying the same to a load to increase the number of output levels, thereby reducing harmonic distortion. .

Recently, efforts have been made to link renewable energy to the system due to depletion of fossil fuels and increase in carbon dioxide.

Solar energy and wind energy account for most of renewable energy generation. Inverter is necessary to convert this energy to electric energy, which is a necessary form, and to link it to the system.

Meanwhile, in the case of the conventional three-level PWM inverter, since the output level is low, harmonic distortion caused by the switching operation is large and the filter size is increased. To solve these problems, various types of multi-level inverters are required have.

Typically, diodes-clamped, capacitor clamped, and cascaded full-bridge inverters have been proposed.

The present inventors have devised to meet the above-mentioned needs, and an object of the present invention is to provide a novel single-phase 7-level coupled inverter capable of outputting a 7-level power source to a DC link power source and thereby reducing harmonic distortion There is.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a single-phase 7-level interconnection inverter comprising: a DC link having four direct-connected DC power sources and a load connected to each other; A level power supply for supplying a '1/4' level power, a '2/4' level power or a '3/4' level power of the power of the DC link to the load; A polarity converting unit which connects the negative terminal of the load and the positive terminal or the negative terminal of the DC link and changes the polarity of the level power supplies; And a '0' level power source forming part connected in parallel at both ends of the load to form a '0' level power source to the load, wherein '0' level, '1/4' Level 7-level linkage capable of outputting '7' level power of level '3/4', '-1/4', '-2/4', and '-3/4' Inverter.

In a preferred embodiment, the DC link is formed by sequentially connecting the first DC power source, the second DC power source, the third DC power source, and the fourth DC power source sequentially from the positive terminal to the negative terminal, A first switch whose one end is connected between the first DC power supply and the second DC power supply; A second switch having one end connected to the other end of the first switch and the other end connected to a terminal between the third DC power supply and the fourth DC power supply; A third switch having one end connected between the second DC power supply and the third DC power supply; And a fourth switch having one end connected to the other end of the third switch and the other end connected to the end between the first switch and the second switch, Is connected to the positive terminal of the load.

In a preferred embodiment, the polarity converting unit includes: a negative polarity forming switch having one end connected to the positive end of the DC link and the other end connected to the negative end of the load; And a positive polarity forming switch having one end connected to the other end of the negative polarity forming switch and the other end connected to the negative end of the DC link.

In a preferred embodiment, the '0' level power source forming unit includes: a first '0' level forming switch having one end connected to the positive end of the load; And a second '0' level formation switch having one end connected to the other end of the switch for forming the '0' level and the other end connected to the negative end of the load.

In a preferred embodiment, the apparatus further includes an input power distributing unit for distributing one input power to the DC power supplies.

In a preferred embodiment, the input power distributor comprises: a first inductor, one end of which is connected to the positive terminal of the input power source; A first charging switch having one end connected to the other end of the first inductor and the other end connected to a negative end of the input power source to charge the first inductor; A first diode having an anode connected to the other end of the first inductor and a cathode connected to a positive end of the DC link; A second inductor whose one end is connected to the negative terminal of the input power supply; A second charging switch having one end connected to the positive terminal of the input power source and the other end connected to the other end of the second inductor to charge the second inductor; And a second diode having an anode connected to the negative terminal of the DC link and a cathode connected to the other end of the second inductor.

In a preferred embodiment, when outputting the '0' level power supply, the first '0' level forming switch and the second '0' level forming switch are turned on, Level forming switch, the second '0' level forming switch and the load form a closed loop.

In a preferred embodiment, when the '1/4' level power is output, the second switch and the positive polarity forming switch are turned on and the fourth DC power source, the second switch, And the switch for forming the positive polarity form a closed loop.

In a preferred embodiment, when the '2/4' level power is output, the third switch, the fourth switch, and the switch for forming the positive polarity are turned on and the fourth DC power supply, The DC power source, the third switch, the fourth switch, the load, and the switch for forming the positive polarity form a closed loop.

In a preferred embodiment, when the '3/4' level power source is output, the first switch and the positive polarity forming switch are turned on, and the fourth DC power source, the third DC power source, 2 DC power supply, the first switch, the load, and the switch for forming the positive polarity form a closed loop.

In a preferred embodiment, when the '-1/4' level power is output, the first switch and the negative polarity forming switch are turned on, and the first DC power supply, the first switch, And the switch for forming the negative polarity form a closed loop.

In a preferred embodiment, when the '-2/4' level power is output, the third switch, the fourth switch, and the negative polarity forming switch are turned on, and the first DC power supply, 2 DC power supply, the third switch, the fourth switch, the load, and the switch for forming the negative polarity form a closed loop.

In a preferred embodiment, when the '-3/4' level power is output, the second switch and the negative polarity forming switch are turned on, and the first DC power source, the second DC power source, The third DC power supply, the second switch, the load, and the switch for forming the negative polarity form a closed loop.

The present invention has the following excellent effects.

According to the single-phase 7-level coupled inverter of the present invention, it is possible to output 7-level power with a small number of switches and to reduce harmonic distortion as the number of output levels increases.

1 is a diagram illustrating a single-phase 7-level coupled inverter according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a switching pattern of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
FIG. 3 is a diagram for explaining '0' level power output of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
4 is a view for explaining '1/4' level power output of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
5 is a view for explaining '2/4' level power output of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
6 is a view for explaining '3/4' level power output of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
7 is a view for explaining '-1/4' level power output of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
FIG. 8 is a view for explaining '-2/4' level power output of a single-phase 7-level coupled inverter according to an embodiment of the present invention;
9 is a view for explaining the '-3/4' level power output of the single-phase 7-level coupled inverter according to the embodiment of the present invention.

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

Referring to FIG. 1, a single-phase 7-level coupled inverter 100 according to an embodiment of the present invention converts power from a DC link 10 to a 7-level output power and supplies the load to a load, Level inverter.

In addition, the DC link 10 includes four direct-connected DC power sources 11, 12, 13, and 14.

The DC power sources 11, 12, 13 and 14 are connected to the first DC power supply 11, the second DC power supply 12, the third DC power supply 13 and a fourth DC power supply 14 are connected in series.

The single-phase 7-level interconnection inverter 100 of the present invention has a "0" level and a "1/4" level, a "2/4" level, a "3/4" level, And outputs a total of 7 levels of power, including '-1/4' level, '-2/4' level, and '-3/4' level power.

The single-phase 7-level coupled inverter 100 of the present invention includes a level power supply 110, a polarity conversion unit 120 and a '0' level power supply forming unit 130, An input power distributor 200 for dividing and dividing the input power supply 20 with the four direct current power supplies 11, 12, 13, and 14 may be further included.

The level power supply unit 110 connects the DC link 10 and the positive terminal of the load and is connected to a '1/4' level power supply, a '2/4' 4 " level power supply to the load.

Further, when each of said V c of the magnitude of the direct current power source (11,12,13,14), the "1/4" level, and the power is V c, the "2/4" level supply is 2V c , And the '3/4' level power source becomes 3V c .

More specifically, the level power supply unit 110 includes a first switch 111, S1, one end of which is connected to a terminal between the first DC power supply 11 and the second DC power supply 12, A second switch 112 and S2 connected to the other end of the switch 111 and having the other end connected to a terminal between the third DC power supply 13 and the fourth DC power supply 14, A third switch 113 and SA1 connected between the power source 12 and the third DC power source 13 and one end connected to the other end of the third switch 113 and the other end connected to the first switch And a fourth switch 114, SA2 connected between the first switch 111 and the second switch 112. [

Further, an end between the first switch 111 and the second switch 112 is connected to the positive terminal of the load.

That is, the level power supply unit 110 may supply a '1/4' level power, a '2/4' level power or a '3/4' level power depending on whether the switches 111, 112, 113, And selectively supplying the load to the load.

The polarity converting unit 120 selectively connects the minus terminal of the load and the positive terminal or the negative terminal of the DC link 10 to determine the polarity of the power supplied from the level power supply unit 110 to the load.

The polarity converting unit 120 includes switches 121 and S3 for negative polarity formation, one end of which is connected to the positive terminal of the DC link 10 and the other terminal of which is connected to the negative terminal of the load, And a positive polarity forming switch (122, S4) connected to the other end of the polarity forming switch and the other end connected to the negative end of the DC link (10).

That is, the negative polarity forming switch 121 connects the minus terminal of the load with the positive terminal of the DC link 10 so that the power supplied from the level power supply unit 110 has a negative polarity, The forming switch 122 connects the minus terminal of the load with the negative terminal of the DC link 10 so that the power supplied from the level power supply unit 110 has a positive polarity.

The '0' level power source forming unit 130 is connected in parallel to both ends of the load, shorting both ends of the load so that a '0' level, that is, a '0' voltage is formed in the load.

The '0' level power supply forming unit 130 includes a first '0' level forming switch 131 and a third level setting switch SB3, one end of which is connected to the positive terminal of the load, 0 'level forming switch 132, SB4 connected to the other end of the switch 131 and the other end connected to the negative terminal of the load.

That is, when the first '0' level forming switch 131 and the second '0' level forming switch 132 are turned on at the same time, a '0' level power source is formed in the load.

The input power distributor 200 distributes one input power source 20 to the DC power sources 11, 12, 13, and 14 of the DC link 10 and balances them.

Further, the input power distributor 200 has one end coupled to a positive terminal of said input power source 20, the first inductor to the input power source 20 is charged or discharged to a charging power source (210, L u) A first charging switch 220 Su connected to the other end of the first inductor 210 at one end and connected to a negative terminal of the input power source 20 to charge the first inductor 210, and its anode is connected to the other terminal of the first inductor 210, and the cathode is the negative terminal of the first diode (230, D u), one end of the input power source 20 is connected to the positive terminal of said DC link (10) A second inductor 240 L d for discharging the charged or charged power of the input power source 20, one end connected to the positive terminal of the input power source 20, and the other end connected to the second inductor 240) for charging the second inductor (240) and a second charging switch (250, Sd) connected to the other end of the DC link Connection to the negative terminal of the 10 and the cathode includes a second diode (260, D d) is connected to the other terminal of the second inductor (240).

Also, the first charging switch 220 and the second charging switch 250 are controlled by a PWM (pulse width modulation) method, and the PWM signal has a phase difference of 180 degrees to reduce the ripple of the input current.

2 shows a switching pattern of a single-phase 7-level linked inverter 100 according to an embodiment of the present invention. FIG. 2 (a) shows a carrier signal for a PWM signal, (c) is a switching waveform of the first switch 111, (d) is a switching waveform of the second switch 112, (e) is a switching waveform of the negative polarity forming switch 121, (G) is a switching waveform of the third switch 113 and the fourth switch 114, and (h) is a switching waveform of the first '0' level forming switch Level forming switch 131 and the second'0'-level forming switch 132, respectively.

2, it can be seen that the voltage of the DC link 10 is outputted to the load by the combination of 'on' and 'off' of the switches. As the output level increases, the harmonic distortion is lowered .

In order to output a '0' level power supply, the first '0' level forming switch 131 and the second '0' Level formation switch 132 is turned on and the first '0' level formation switch 131, the second '0' level formation switch 132, and the load (Load) It accomplishes.

4 is a view for explaining a current flow in the '1/4' level power output. In order to output a '1/4' level power, the second switch 112 and the positive polarity forming switch 122 The fourth DC power supply 14, the second switch 112, the load, and the switch 122 for forming the positive polarity form a closed loop.

5 is a view for explaining a current flow in the '2/4' level power output. In order to output a '2/4' level power, the third switch 113, the fourth switch 114, The positive polarity forming switch 122 is turned on and the fourth DC power supply 14, the third DC power supply 130, the third switch 113, the fourth switch 114, The load and the switch 122 for forming the positive polarity form a closed loop.

6 is a view for explaining a current flow in the '3/4' level power output. In order to output a '3/4' level power, the first switch 111 and the positive polarity forming switch 122 The third DC power supply 13, the second DC power supply 12, the first switch 111, the load, and the plus The polarity forming switch 122 forms a closed loop.

7 is a view for explaining a current flow in the `-1/4` level power output. In order to output` -1/4` level power, the first switch 111 and the negative polarity- The first DC power supply 11, the first switch 111, the load and the negative polarity forming switch 121 form a closed loop.

8 is a view for explaining a current flow in the '-2/4' level power output. In order to output a '-2/4' level power, the third switch 113, the fourth switch 114 And the negative polarity forming switch 121 are turned on and the first direct current power source 11, the second direct current power source 12, the third switch 113, the fourth switch 114, , The load (Load) and the negative polarity forming switch 121 form a closed loop.

9 is a view for explaining the flow of current during the '-3/4' level power output. In order to output the '-3/4' level power, the second switch 112 and the negative polarity- The first DC power supply 11, the second DC power supply 12, the third DC power supply 13, the second switch 112, the load, The negative polarity forming switch 121 forms a closed loop.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the present invention. Various changes and modifications will be possible.

10: DC link 11: first DC power source
12: second DC power source 13: third DC power source
14: fourth direct current power supply 100: single phase 7-level connection type inverter
110: level power supply unit 111: first switch
112: second switch 113: third switch
114: fourth switch 120: polarity converting section
121: Negative polarity forming switch 122: Positive polarity forming switch
130: '0' level power supply forming part 131: 1st '0' level forming switch
132: second '0' level formation switch 200: input power distributor
210: first inductor 220: first charging switch
230: first diode 240: second inductor
250: second charging switch 260: second diode

Claims (13)

A single-phase 7-level linkage inverter connects a DC link having four direct-
A '1/4' level power supply, a '2/4' level power supply or a '3/4' level power supply of the power source of the DC link is connected to the load Level power supply;
A polarity converting unit which connects the negative terminal of the load and the positive terminal or the negative terminal of the DC link and changes the polarity of the level power supplies; And
And a '0' level power source forming part connected in parallel at both ends of the load to form a '0' level power source to the load,
Level, the '-2/4' level, and the '-3/4' level, the '0' level, the '1/4' level, the '2/4' level, the ' Level 7-level linkage inverter capable of outputting '7' level power.
The method according to claim 1,
The DC link is formed by sequentially connecting the first DC power source, the second DC power source, the third DC power source, and the fourth DC power source sequentially from the positive terminal to the negative terminal,
The level power supply unit:
A first switch whose one end is connected between the first DC power supply and the second DC power supply;
A second switch having one end connected to the other end of the first switch and the other end connected to a terminal between the third DC power supply and the fourth DC power supply;
A third switch having one end connected between the second DC power supply and the third DC power supply; And
And a fourth switch having one end connected to the other end of the third switch and the other end connected to the end between the first switch and the second switch,
And the end of the first switch and the second switch is connected to the positive terminal of the load.
3. The method of claim 2,
Wherein the polarity conversion unit:
A negative polarity forming switch having one end connected to the positive end of the DC link and the other end connected to the negative end of the load; And
And a positive polarity forming switch having one end connected to the other end of the negative polarity forming switch and the other end connected to a negative end of the DC link.
The method of claim 3,
The '0' level power source forming unit:
A first '0' level formation switch whose one end is connected to the positive terminal of the load; And
And a second '0' level forming switch having one end connected to the other end of the first '0' level forming switch and the other end connected to a negative end of the load. inverter.
5. The method according to any one of claims 1 to 4,
Further comprising an input power distributing unit for distributing one input power to the DC power supplies.
6. The method of claim 5,
Wherein the input power distributing unit comprises:
A first inductor whose one end is connected to the positive end of the input power source;
A first charging switch having one end connected to the other end of the first inductor and the other end connected to a negative end of the input power source to charge the first inductor;
A first diode having an anode connected to the other end of the first inductor and a cathode connected to a positive end of the DC link;
A second inductor whose one end is connected to the negative terminal of the input power supply;
A second charging switch having one end connected to the positive terminal of the input power source and the other end connected to the other end of the second inductor to charge the second inductor; And
And a second diode having an anode connected to the negative terminal of the DC link and a cathode connected to the other terminal of the second inductor.
5. The method of claim 4,
Level configuration power supply, the first '0' level formation switch and the second '0' level formation switch are turned on to output the '0' level power, And the second " 0 " level formation switch and the load form a closed loop.
8. The method of claim 7,
When the '1/4' level power is output, the second switch and the positive polarity forming switch are turned on and the fourth DC power source, the second switch, the load, and the positive polarity forming And the switch forms a closed loop.
9. The method of claim 8,
Level power supply, the third switch, the fourth switch, and the switch for forming the positive polarity are turned on, and the fourth DC power supply, the third DC power supply, the third Wherein the switch, the fourth switch, the load, and the switch for forming the positive polarity form a closed loop.
10. The method of claim 9,
When the '3/4' level power is output, the first switch and the positive polarity forming switch are turned on, and the fourth DC power, the third DC power, the second DC power, 1 < / RTI > switch, the load and the switch for forming the positive polarity form a closed loop.
11. The method of claim 10,
When the `-1/4` level power is output, the first switch and the negative polarity forming switch are turned on, and the first DC power, the first switch, the load, and the negative polarity forming And the switch forms a closed loop.
12. The method of claim 11,
When the '-2/4' level power is output, the third switch, the fourth switch, and the negative polarity forming switch are turned on, and the first DC power source, the second DC power source, 3-switch, the fourth switch, the load and the switch for forming the negative polarity form a closed loop.
13. The method of claim 12,
When the '-3/4' level power is output, the second switch and the negative polarity forming switch are turned on, and the first DC power, the second DC power, the third DC power, Wherein the first switch, the second switch, the load, and the switch for forming the negative polarity form a closed loop.



KR1020150136588A 2015-09-25 2015-09-25 Single-phase seven-level grid-connected inverter KR101727010B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190109313A (en) 2018-03-17 2019-09-25 이재권 Multilevel Inverters and Driving Methods Thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849719B (en) * 2017-04-13 2019-06-07 北京交通大学 Seven electrical level inverters and seven level inverse conversion topological structures
CN108599604B (en) * 2018-04-19 2020-08-18 西安理工大学 Single-phase seven-level inverter and PWM signal modulation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011004464A (en) 2009-06-16 2011-01-06 Toshiba Corp Power conversion equipment
CN102882410A (en) 2012-10-29 2013-01-16 阳光电源股份有限公司 Single-phase seven-level inverter
US20140376287A1 (en) 2013-06-20 2014-12-25 Rockwell Automation Technologies, Inc. Multilevel voltage source converters and systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011004464A (en) 2009-06-16 2011-01-06 Toshiba Corp Power conversion equipment
CN102882410A (en) 2012-10-29 2013-01-16 阳光电源股份有限公司 Single-phase seven-level inverter
US20140376287A1 (en) 2013-06-20 2014-12-25 Rockwell Automation Technologies, Inc. Multilevel voltage source converters and systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190109313A (en) 2018-03-17 2019-09-25 이재권 Multilevel Inverters and Driving Methods Thereof

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