CN106877722A - A kind of highly reliable buck-boost grid-connected inverter - Google Patents

A kind of highly reliable buck-boost grid-connected inverter Download PDF

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Publication number
CN106877722A
CN106877722A CN201710239195.9A CN201710239195A CN106877722A CN 106877722 A CN106877722 A CN 106877722A CN 201710239195 A CN201710239195 A CN 201710239195A CN 106877722 A CN106877722 A CN 106877722A
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CN
China
Prior art keywords
switching tube
diode
switch pipe
filter inductance
highly reliable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710239195.9A
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Chinese (zh)
Inventor
姚志垒
徐静
徐进
彭思敏
李小凡
廖启蒙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yangcheng Institute of Technology
Yancheng Institute of Technology
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Yangcheng Institute of Technology
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Application filed by Yangcheng Institute of Technology filed Critical Yangcheng Institute of Technology
Priority to CN201710239195.9A priority Critical patent/CN106877722A/en
Publication of CN106877722A publication Critical patent/CN106877722A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators

Abstract

The invention discloses a kind of highly reliable buck-boost grid-connected inverter, belong to inverter.Highly reliable buck-boost grid-connected inverter of the invention includes input power, the first filter inductance, the second filter inductance, first switch pipe, second switch pipe, the 5th switching tube, the 6th switching tube, first switch unit, second switch unit, filter circuit and power network.The straight-through problem of power tube without conventional bridge inverter leg of the invention, substantially increases the reliability of system；Each switching tube need not set Dead Time, improve the waveform quality of power network current；It is capable of achieving the conversion of single-stage buck, it is not necessary to the Two Stages of conventional buck combining inverter；Only need to 2 diodes.

Description

A kind of highly reliable buck-boost grid-connected inverter
Technical field
The present invention relates to a kind of inverter, especially a kind of highly reliable buck-boost grid-connected inverter.
Background technology
As increasingly sharpening for environmental pollution is continuous in short supply with fossil energy, fuel cell, wind energy and solar energy etc. can The renewable sources of energy are due to having the advantages that clean and safe, pollution-free, renewable and increasingly paid close attention to by people.But solar-electricity Pond and fuel cell etc. are output as direct current, and line voltage is alternating current, therefore, combining inverter turns into distributed power generation The important component of system and micro-capacitance sensor.Again because the output voltage range of solar cell and fuel cell etc. is wide, sometimes Less than line voltage, some cases greater than line voltage, therefore, cannot be realized using traditional single-stage buck type inverter, generally need So as to improve the complexity of system, to reduce reliability again plus a preceding stage DC-DC converter, increased system into This.
Buck-boost grid-connected inverter and its control method disclosed in open source literature (B of CN 102005962), realize single-stage The function of buck conversion, with reliability high；It is a kind of disclosed in open source literature (B of CN 103219912) to be adapted to input wide Voltage up-down presses the control method of combining inverter, on the basis of open source literature (B of CN 102005962) main circuit topology, A kind of new control method is proposed, buck and step-down both of which can be operated in.But document disclosed above is present asks as follows Topic：4 diodes are needed, it is relatively costly；Switching loss and conduction loss are high, and efficiency is low, are unfavorable for popularization and application.
The content of the invention
Shortcoming it is an object of the invention to be directed to combining inverter in the prior art, proposes that a kind of power device is few and imitates Rate highly reliable buck-boost grid-connected inverter high.
Highly reliable buck-boost grid-connected inverter of the invention, including input power Uin, the first filter inductance L1, second filtering Inductance L2, first switch pipe S1, second switch pipe S2, the 5th switching tube S5, the 6th switching tube S6, first switch unit 1, second open Close unit 2, filter circuit 3 and power network ug, wherein first switch unit 1 include the 3rd switching tube S3With the first diode D1, second Switch element 2 includes the 4th switching tube S4With the second diode D2, filter circuit 3 include filter inductance Lg, damping resistance RdAnd filter Ripple electric capacity Cf.Specifically topological structure is：Input power UinPositive pole connect the first filter inductance L respectively1One end, second filtering Inductance L2One end, the 3rd switching tube S3One end and the 4th switching tube S4One end, input power UinNegative pole connection first open Close pipe S1One end and second switch pipe S2One end, first switch pipe S1The other end connect the 5th switching tube S5One end and First filter inductance L1The other end, the 5th switching tube S5The other end connect the first diode D respectively1Anode, filter inductance LgOne end and damping resistance RdOne end, the first diode D1Negative electrode connect the 3rd switching tube S3The other end, damping resistance RdOther end connection filter capacitor CfOne end, filter inductance LgOther end connection power network ugPositive pole, power network ugNegative pole Filter capacitor C is connected respectivelyfThe other end, the 6th switching tube S6One end and the second diode D2Negative electrode, the second diode D2 Negative electrode connect the 4th switching tube S4The other end, the 6th switching tube S6The other end connect second switch pipe S respectively2It is another End and the second filter inductance L2The other end.
First switch pipe S1With second switch pipe S2Drive signal altogether, the 3rd switching tube S3With the 4th switching tube S4Drive Signal is altogether.
First~the 6th switching tube is IGBT or MOSFET.First diode and the second diode be silicon carbide diode or Fast recovery diode.
Input power UinIt is the one kind in the novel energy-storing power supply such as battery, fuel cell or photovoltaic cell.
The control method of highly reliable buck-boost grid-connected inverter of the invention：As power network ugDuring more than or equal to zero, second opens Close pipe S2, the 3rd switching tube S3With the 6th switching tube S6Normal off, the 4th switching tube S4With the 5th switching tube S5Shut-off is opened simultaneously, the One switching tube S1With the 4th switching tube S4Complementary switch, by adjusting first switch pipe S1Dutycycle adjust power network current ig Size, it is ensured that power network current igWith power network ugWith the same phase of frequency；As power network ugDuring less than zero, first switch pipe S1, the 4th switching tube S4With the 5th switching tube S5Normal off, the 3rd switching tube S3With the 6th switching tube S6Open shut-off, second switch pipe S simultaneously2With the 3rd Switching tube S3Complementary switch, by adjusting second switch pipe S2Dutycycle adjust power network current igSize, it is ensured that power network electricity Stream igWith power network ugWith the same phase of frequency.
Highly reliable buck-boost grid-connected inverter of the invention does not have the straight-through problem of the power tube of conventional bridge inverter leg, Substantially increase the reliability of system；Each switching tube need not set Dead Time, improve the waveform quality of power network current；Can be real Existing single-stage buck conversion, it is not necessary to the Two Stages of conventional buck combining inverter；Only need to 2 diodes.
Brief description of the drawings
Fig. 1：The topology diagram of highly reliable buck-boost grid-connected inverter of the invention.
Primary symbols title in figure：Uin--- supply voltage, S1~S6--- switching tube, D1And D2--- diode, L1, L2--- filter inductance, Lg--- net side filter inductance, Cf--- filter capacitor, Rd--- damping resistance, ug--- power network electricity Pressure, ig--- power network current, iL1, iL2--- inductance L1And L2Electric current.
Specific embodiment
As shown in Figure 1, the highly reliable buck-boost grid-connected inverter of the application, including input power Uin, the first filter inductance L1, the second filter inductance L2, first switch pipe S1, second switch pipe S2, the 5th switching tube S5, the 6th switching tube S6, first switch Unit 1, second switch unit 2, filter circuit 3 and power network ug, wherein first switch unit 1 include the 3rd switching tube S3With first Diode D1, second switch unit 2 include the 4th switching tube S4With the second diode D2, filter circuit 3 include filter inductance Lg、 Damping resistance RdWith filter capacitor Cf.Specifically topological structure is：Input power UinPositive pole connect the first filter inductance L respectively1's One end, the second filter inductance L2One end, the 3rd switching tube S3One end and the 4th switching tube S4One end, input power Uin's Negative pole connection first switch pipe S1One end and second switch pipe S2One end, first switch pipe S1Other end connection the 5th open Close pipe S5One end and the first filter inductance L1The other end, the 5th switching tube S5The other end connect the first diode D respectively1 Anode, filter inductance LgOne end and damping resistance RdOne end, the first diode D1Negative electrode connect the 3rd switching tube S3's The other end, damping resistance RdOther end connection filter capacitor CfOne end, filter inductance LgOther end connection power network ugJust Pole, power network ugNegative pole connect filter capacitor C respectivelyfThe other end, the 6th switching tube S6One end and the second diode D2The moon Pole, the second diode D2Negative electrode connect the 4th switching tube S4The other end, the 6th switching tube S6The other end connect second respectively Switching tube S2The other end and the second filter inductance L2The other end.
First switch pipe S1With second switch pipe S2Drive signal altogether, the 3rd switching tube S3With the 4th switching tube S4Drive Signal is altogether.
First~the 6th switching tube is IGBT or MOSFET.First diode and the second diode be silicon carbide diode or Fast recovery diode.
Input power UinIt is the one kind in the novel energy-storing power supply such as battery, fuel cell or photovoltaic cell.
The control method of the highly reliable buck-boost grid-connected inverter of the application：As power network ugDuring more than or equal to zero, second opens Close pipe S2, the 3rd switching tube S3With the 6th switching tube S6Normal off, the 4th switching tube S4With the 5th switching tube S5Shut-off is opened simultaneously, the One switching tube S1With the 4th switching tube S4Complementary switch, by adjusting first switch pipe S1Dutycycle adjust power network current ig Size, it is ensured that power network current igWith power network ugWith the same phase of frequency；As power network ugDuring less than zero, first switch pipe S1, the 4th switching tube S4With the 5th switching tube S5Normal off, the 3rd switching tube S3With the 6th switching tube S6Open shut-off, second switch pipe S simultaneously2With the 3rd Switching tube S3Complementary switch, by adjusting second switch pipe S2Dutycycle adjust power network current igSize, it is ensured that power network electricity Stream igWith power network ugWith the same phase of frequency.
Power network current igSinusoidal Pulse Width Modulation or hysteretic loop current control can be used.
Before analysis, make the following assumptions：1. all switching tubes and diode are ideal component, when not considering switch Between, conduction voltage drop；2. all inductance, electric capacity are ideal element.
Line voltage ugDuring more than or equal to zero, there are 2 kinds of operation modes, it is specific as follows：
1) mode 1 is switched
First switch pipe S1Open-minded, other switching tubes are turned off, second switch pipe S2The voltage for bearing is Uin, the 3rd switch Pipe S3, the 4th switching tube S4With the 5th switching tube S5The voltage for bearing is 0, the 6th switching tube S6The voltage for bearing is Uin+ug, the One diode D1The voltage for bearing is Uin, the second diode D2The voltage for bearing is Uin+ug, the first filter inductance electric current iL1On Rise.
2) mode 2 is switched
4th switching tube S4With the 5th switching tube S5Open-minded, other switching tubes are turned off, first switch pipe S1The voltage for bearing It is Uin+ug, second switch pipe S2The voltage for bearing is Uin, the 3rd switching tube S3The voltage for bearing is ug, the 6th switching tube S6Bear Voltage be 0, the first diode D1Conducting, the first filter inductance electric current iL1Decline.
Line voltage ugDuring less than zero, there are 2 kinds of operation modes, it is specific as follows：
1) mode 1 is switched
Second switch pipe S2Open-minded, other switching tubes are turned off, first switch pipe S1The voltage for bearing is Uin, the 3rd switch Pipe S3, the 4th switching tube S4With the 6th switching tube S6The voltage for bearing is 0, the 5th switching tube S5The voltage for bearing is Uin-ug, the Two diode D2The voltage for bearing is Uin, the first diode D1The voltage for bearing is Uin-ug, the second filter inductance electric current iL2Negative sense Increase.
2) mode 2 is switched
3rd switching tube S3With the 6th switching tube S6Open-minded, other switching tubes are turned off, second switch pipe S2The voltage for bearing It is Uin-ug, first switch pipe S1The voltage for bearing is Uin, the 4th switching tube S4The voltage for bearing is-ug, the 5th switching tube S5Hold The voltage received is 0, the second diode D2Conducting, the second filter inductance electric current iL2Negative sense reduces.

Claims (5)

1. a kind of highly reliable buck-boost grid-connected inverter, it is characterised in that including input power Uin, the first filter inductance L1, second Filter inductance L2, first switch pipe S1, second switch pipe S2, the 5th switching tube S5, the 6th switching tube S6, first switch unit 1, Two switch elements 2, filter circuit 3 and power network ug, wherein first switch unit 1 include the 3rd switching tube S3With the first diode D1, Second switch unit 2 includes the 4th switching tube S4With the second diode D2, filter circuit 3 include filter inductance Lg, damping resistance Rd With filter capacitor Cf.Specifically topological structure is：Input power UinPositive pole connect the first filter inductance L respectively1One end, second Filter inductance L2One end, the 3rd switching tube S3One end and the 4th switching tube S4One end, input power UinNegative pole connection the One switching tube S1One end and second switch pipe S2One end, first switch pipe S1The other end connect the 5th switching tube S5One End and the first filter inductance L1The other end, the 5th switching tube S5The other end connect the first diode D respectively1Anode, filtering Inductance LgOne end and damping resistance RdOne end, the first diode D1Negative electrode connect the 3rd switching tube S3The other end, damping Resistance RdOther end connection filter capacitor CfOne end, filter inductance LgOther end connection power network ugPositive pole, power network ug's Negative pole connects filter capacitor C respectivelyfThe other end, the 6th switching tube S6One end and the second diode D2Negative electrode, the two or two pole Pipe D2Negative electrode connect the 4th switching tube S4The other end, the 6th switching tube S6The other end connect second switch pipe S respectively2's The other end and the second filter inductance L2The other end.
2. highly reliable buck-boost grid-connected inverter according to claim 1, the first switch pipe S1With second switch pipe S2 Drive signal altogether, the 3rd switching tube S3With the 4th switching tube S4Drive signal is altogether.
3. highly reliable buck-boost grid-connected inverter according to claim 1, the described first~the 6th switching tube be IGBT or MOSFET。
4. highly reliable buck-boost grid-connected inverter according to claim 1, first diode and the second diode are Silicon carbide diode or fast recovery diode.
5. highly reliable buck-boost grid-connected inverter according to claim 1, the input power UinIt is battery, fuel electricity One kind in the novel energy-storing power supply such as pond or photovoltaic cell.
CN201710239195.9A 2017-04-13 2017-04-13 A kind of highly reliable buck-boost grid-connected inverter Pending CN106877722A (en)

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Application Number Priority Date Filing Date Title
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1967999A (en) * 2006-10-23 2007-05-23 南京航空航天大学 Double step-down inverter
GB2451910A (en) * 2007-08-17 2009-02-18 Pwm Drives Ltd Bidirectional DC AC converter with multiple buck boost converters and magnetic energy storage device.
CN102005962A (en) * 2010-11-05 2011-04-06 盐城工学院 Buck-boost grid-connected inverter and control method thereof
CN103036431A (en) * 2012-11-28 2013-04-10 南京信息工程大学 Cascade type buck-boost converter input side current control method
CN103219912A (en) * 2013-04-28 2013-07-24 盐城工学院 Control method suitable for universal input voltage buck-boost grid-connected inverter
US20140217827A1 (en) * 2013-02-01 2014-08-07 3L Power Llc Apparatus for and method of operation of a power inverter system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1967999A (en) * 2006-10-23 2007-05-23 南京航空航天大学 Double step-down inverter
GB2451910A (en) * 2007-08-17 2009-02-18 Pwm Drives Ltd Bidirectional DC AC converter with multiple buck boost converters and magnetic energy storage device.
CN102005962A (en) * 2010-11-05 2011-04-06 盐城工学院 Buck-boost grid-connected inverter and control method thereof
CN103036431A (en) * 2012-11-28 2013-04-10 南京信息工程大学 Cascade type buck-boost converter input side current control method
US20140217827A1 (en) * 2013-02-01 2014-08-07 3L Power Llc Apparatus for and method of operation of a power inverter system
CN103219912A (en) * 2013-04-28 2013-07-24 盐城工学院 Control method suitable for universal input voltage buck-boost grid-connected inverter

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SACHIN JAIN,ET AL: "A Single-Stage Grid Connected Inverter Topology for Solar PV Systems With Maximum Power Point Tracking", 《TEEE TRANSANTIONS ON POWER ELECTRONICS》 *
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Application publication date: 20170620