CN108183609A - A kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system - Google Patents

A kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system Download PDF

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Publication number
CN108183609A
CN108183609A CN201810006659.6A CN201810006659A CN108183609A CN 108183609 A CN108183609 A CN 108183609A CN 201810006659 A CN201810006659 A CN 201810006659A CN 108183609 A CN108183609 A CN 108183609A
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CN
China
Prior art keywords
capacitance
cathode
anode
diode
sustained diode
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Pending
Application number
CN201810006659.6A
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Chinese (zh)
Inventor
林明耀
艾建
刘同民
贾伦
伍锡坤
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Southeast University
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Southeast University
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Priority to CN201810006659.6A priority Critical patent/CN108183609A/en
Publication of CN108183609A publication Critical patent/CN108183609A/en
Pending legal-status Critical Current

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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
    • 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
    • H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M3/1552—Boost converters exploiting the leakage inductance of a transformer or of an alternator as boost inductor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a kind of photovoltaic system cascade connection type DC/DC converters of asymmetric boosting unit, including input power Vin, input power VinAnode connection inductance L1One end, inductance L1The other end connect sustained diode respectively1Anode and sustained diode2Anode, sustained diode1Cathode connect inductance L respectively2One end, capacitance C1One end and capacitance C2One end, inductance L2The other end difference sustained diode4Anode, capacitance C3One end, sustained diode2Cathode and switching tube S drain electrode, capacitance C2The other end connect sustained diode respectively4Cathode and sustained diode3Anode, capacitance C3The other end connect sustained diode respectively3Cathode and output rectifier diode DoAnode, output rectifier diode DoCathode connect output capacitance C respectivelyoOne end and load resistance R one end, output capacitance CoThe other end, the other end of load resistance R, the source electrode of switching tube S and capacitance C1The other end connect input power V respectivelyinCathode.The present invention can improve efficiency and the ratio of gains.

Description

A kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system
Technical field
The present invention relates to booster converter, more particularly to a kind of photovoltaic system cascade connection type of asymmetric boosting unit DC/DC converters.
Background technology
With increasingly exhausted and environment for human survival the worsening of traditional fossil energy, the regenerative resource of clean type Development arrived extremely urgent stage, countries in the world are all in the application for being dedicated to researching and developing new energy, wherein too It is positive to have been obtained for relatively broad application with wind energy.But for these systems, how to be incorporated into the power networks, meet in power grid High voltage needs to be still sixty-four dollar question.At present, a large amount of boost converter, which is developed, meets these applications, not In same converter, traditional BOOST converter theoretically can improve voltage gain by improving duty ratio.It is but practical In, due to the limitation of parasitic parameter, very high voltage gain can not be realized.According to the topological structure of cascade connection type, device The problem of inefficient caused by number of packages amount increase, can highlight again.
Invention content
Goal of the invention：The object of the present invention is to provide a kind of photovoltaic system that can improve efficiency and the ratio of gains is asymmetric The cascade connection type DC/DC converters of boosting unit.
Technical solution：To reach this purpose, the present invention uses following technical scheme：
The cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system of the present invention, including input power Vin, input power VinAnode connection inductance L1One end, inductance L1The other end connect sustained diode respectively1Anode And sustained diode2Anode, sustained diode1Cathode connect inductance L respectively2One end, capacitance C1One end and capacitance C2One end, inductance L2The other end difference sustained diode4Anode, capacitance C3One end, sustained diode2Cathode and The drain electrode of switching tube S, capacitance C2The other end connect sustained diode respectively4Cathode and sustained diode3Anode, electricity Hold C3The other end connect sustained diode respectively3Cathode and output rectifier diode DoAnode, export rectifier diode DoCathode connect output capacitance C respectivelyoOne end and load resistance R one end, output capacitance CoThe other end, load resistance R The other end, the source electrode of switching tube S and capacitance C1The other end connect input power V respectivelyinCathode.
Advantageous effect：The invention discloses a kind of photovoltaic system cascade connection type DC/DC converters of asymmetric boosting unit, Compared with prior art, there is following advantageous effect：
1) present invention has merged asymmetric boosting unit structure, and compared with traditional booster converter, boost performance obtains To raising；Compared with the boosting unit of symmetrical structure, with the increase of duty ratio, which has superior boost voltage Performance；
2) present invention has merged asymmetric boosting unit and cascade boost structure, in the base for not increasing switching tube S quantity On plinth, it is effectively improved voltage gain, and switching tube S and output rectifier diode DoElectric stress be unaffected；
3) present invention employs non-isolated circuit structures, on the basis of boost capability is significantly improved, significantly improve The working efficiency of circuit, when duty is higher, the working efficiency of boost capability and circuit has more superior excellent converter Gesture is more suitable for applying in middle large-power occasions.
Description of the drawings
Fig. 1 is the circuit diagram of DC/DC converters in the specific embodiment of the invention；
Fig. 2 is the equivalent circuit diagram of DC/DC converters in the specific embodiment of the invention；
Fig. 3 is the modal graph of DC/DC converters in the specific embodiment of the invention；
Fig. 4 is the isoboles of the first switch mode of DC/DC converters in the specific embodiment of the invention；
Fig. 5 is the isoboles of second of switch mode of DC/DC converters in the specific embodiment of the invention；
Fig. 6 is the switching tube S both end voltages of DC/DC converters, output voltage V in the specific embodiment of the inventionoWith it is defeated Go out rectifier diode DoThe oscillogram of both end voltage；
Fig. 7 is the switching tube of DC/DC converters in the specific embodiment of the inventionSBoth end voltage, inductance L1Electric current and electricity Feel L1The oscillogram of both end voltage；
Fig. 8 is the switching tube S both end voltages of DC/DC converters, inductance L in the specific embodiment of the invention2Electric current and Inductance L2The oscillogram of both end voltage；
Fig. 9 is switching tube S both end voltages, the sustained diode of DC/DC converters in the specific embodiment of the invention3Two Terminal voltage and sustained diode4The oscillogram of both end voltage.
Specific embodiment
Technical scheme of the present invention is further introduced with attached drawing With reference to embodiment.
Present embodiment discloses a kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system, Such as Fig. 1, including input power Vin, input power VinAnode connection inductance L1One end, inductance L1The other end connect respectively Sustained diode1Anode and sustained diode2Anode, sustained diode1Cathode connect inductance L respectively2One end, Capacitance C1One end and capacitance C2One end, inductance L2The other end difference sustained diode4Anode, capacitance C3One end, continuous Flow diode D2Cathode and switching tube S drain electrode, capacitance C2The other end connect sustained diode respectively4Cathode and afterflow Diode D3Anode, capacitance C3The other end connect sustained diode respectively3Cathode and output rectifier diode DoSun Pole, output rectifier diode DoCathode connect output capacitance C respectivelyoOne end and load resistance R one end, output capacitance Co The other end, the other end of load resistance R, the source electrode of switching tube S and capacitance C1The other end connect input power V respectivelyin's Cathode.
Wherein, switching tube S is MOSFET or IGBT.
The equivalent circuit of switching tube S is parasitic capacitance Cp, as shown in Figure 2.The electric current of input power is iin, input power Voltage is Vin, inductance L1Electric current isInductance L1The voltage of both sides isInductance L2Electric current beInductance L2The voltage of both sides ForExport rectifier diode DoElectric current beExport rectifier diode DoThe voltage at both ends isFlow through switching tube S's Electric current is iS, the voltage at switching tube S both ends is VS, diode D1Electric current beDiode D1The voltage at both ends isTwo poles Pipe D2Electric current beDiode D2The voltage at both ends isDiode D3Electric current beDiode D3The voltage at both ends isDiode D4Electric current beDiode D4The voltage at both ends isCapacitance C1Electric current beCapacitance C1The electricity at both ends It presses and isCapacitance C2Electric current beCapacitance C2The voltage at both ends isCapacitance C3Electric current beCapacitance C3The electricity at both ends It presses and isOutput capacitance CoElectric current beOutput capacitance CoThe voltage at both ends isThe electric current of load resistance R is io。
Fig. 3 is the modal graph of DC/DC converters.The course of work of DC/DC converters is divided into 2 switch mode, respectively For the first switch mode to second of switch mode, resistance R is load, is described in detail below：
The first switch mode, [t in corresponding diagram 30,t1]：Shown in equivalent circuit Fig. 4, switching tube S and fly-wheel diode D2, sustained diode3Conducting, the circulating pathway of electric current is as shown in figure 4, power supply gives inductance L1Charging, inductance L1Continue to store energy Amount, meanwhile, capacitance C1Pass through diode D3, capacitance C2The circuit formed with switching tube S is simultaneously to inductance L2With capacitance C3Charging, electricity Feel L2With capacitance C3Energy is stored together, and voltage continues to increase, output capacitance CoGive load R power supplies.
Second of switch the mode, [t in corresponding diagram 31,t2]：Shown in equivalent circuit Fig. 5, switching tube S is in t2When turn off, together When, sustained diode1, sustained diode4With output rectifier diode DoIt is open-minded, sustained diode2And sustained diode3It closes Disconnected, the circulating pathway of electric current is as shown in figure 5, power supply, inductance L1, inductance L2With capacitance C3It releases energy simultaneously to load, and give Capacitance C1, capacitance C2With output capacitance CoCharging, capacitance C1, capacitance C2With output capacitance CoStore energy.
Gain expressions can be obtained from the above analysis is：
Wherein D is the duty ratio of switching tube S.
When converter is according to the first switch mode to second of switch Modality work, switching tube S, inductance L in circuit1、 Inductance L2, output rectifier diode DoBoth end voltage, sustained diode4Both end voltage, sustained diode3The wave of both end voltage Shape is described in detail below：
In figure 6, input voltage Vin=40V, output voltage VoThe drain-source both end voltage difference V of=380V, switching tube SDS's Ordinate be 100 volts/cell, output voltage VoOrdinate be 100 volts/cell, output diode DoBoth end voltageIt is vertical to sit It is designated as 50 volts/cell.
In the figure 7, input voltage Vin=40V, output voltage VoThe drain-source both end voltage difference V of=380V, switching tube SDS's Ordinate be 100 volts/cell, inductance L1VoltageOrdinate be 25 volts/cell, inductance L1Electric currentOrdinate is 5 Peace/cell.
In fig. 8, input voltage Vin=40V, output voltage VoThe drain-source both end voltage difference V of=380V, switching tube SDS's Ordinate be 100 volts/cell, inductance L2VoltageOrdinate be 100 volts/cell, inductance L2Electric currentOrdinate is 2.5 peaces/cell.
In fig.9, input voltage Vin=40V, output voltage VoThe drain-source both end voltage difference V of=380V, switching tube SDS's Ordinate be 100 volts/cell, diode D3Both end voltageOrdinate be 50 volts/cell, diode D4Both end voltage Ordinate is 50 volts/cell.

Claims (1)

1. a kind of photovoltaic system cascade connection type DC/DC converters of asymmetric boosting unit, including input power Vin, input power VinAnode connection inductance L1One end, inductance L1The other end connect sustained diode respectively1Anode and fly-wheel diode D2Anode, sustained diode1Cathode connect inductance L respectively2One end, capacitance C1One end and capacitance C2One end, inductance L2The other end difference sustained diode4Anode, capacitance C3One end, sustained diode2Cathode and switching tube S leakage Pole, capacitance C2The other end connect sustained diode respectively4Cathode and sustained diode3Anode, capacitance C3The other end Sustained diode is connected respectively3Cathode and output rectifier diode DoAnode, output rectifier diode DoCathode difference Connect output capacitance CoOne end and load resistance R one end, output capacitance CoThe other end, load resistance R the other end, open Close the source electrode and capacitance C of pipe S1The other end connect input power V respectivelyinCathode.
CN201810006659.6A 2018-01-04 2018-01-04 A kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system Pending CN108183609A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109391144A (en) * 2018-11-12 2019-02-26 浙江工业大学 A kind of cascade step-up dc-dc converter
CN109391141A (en) * 2018-11-12 2019-02-26 浙江工业大学 The continuous step-up dc-dc converter of input and output electric current
CN109474182A (en) * 2018-11-12 2019-03-15 浙江工业大学 A kind of cascade buck-boost type DC-DC converter
CN109510462A (en) * 2018-11-12 2019-03-22 浙江工业大学 Step-up dc-dc converter
CN111641335A (en) * 2020-05-18 2020-09-08 江苏方天电力技术有限公司 Household photovoltaic power generation power optimizer with high step-up ratio
CN112039181A (en) * 2020-07-15 2020-12-04 中国科学院空天信息创新研究院 Laser energy transmission power supply system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J. LEYVA-RAMOS,ET.AL.: "Switching regulator using a quadratic boost converter for wide DC conversion ratios", 《IET POWER ELECTRONICS》 *
JIAN AI.ET.AL.: "Ultralarge Gain Step-Up Coupled-Inductor DC–DC Converter With an Asymmetric Voltage Multiplier Network for a Sustainable Energy System", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109391144A (en) * 2018-11-12 2019-02-26 浙江工业大学 A kind of cascade step-up dc-dc converter
CN109391141A (en) * 2018-11-12 2019-02-26 浙江工业大学 The continuous step-up dc-dc converter of input and output electric current
CN109474182A (en) * 2018-11-12 2019-03-15 浙江工业大学 A kind of cascade buck-boost type DC-DC converter
CN109510462A (en) * 2018-11-12 2019-03-22 浙江工业大学 Step-up dc-dc converter
CN111641335A (en) * 2020-05-18 2020-09-08 江苏方天电力技术有限公司 Household photovoltaic power generation power optimizer with high step-up ratio
CN112039181A (en) * 2020-07-15 2020-12-04 中国科学院空天信息创新研究院 Laser energy transmission power supply system

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Application publication date: 20180619

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