CN204928737U - Photovoltaic power generation device based on two buck dc -to -ac converters - Google Patents

Photovoltaic power generation device based on two buck dc -to -ac converters Download PDF

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Publication number
CN204928737U
CN204928737U CN201520556360.XU CN201520556360U CN204928737U CN 204928737 U CN204928737 U CN 204928737U CN 201520556360 U CN201520556360 U CN 201520556360U CN 204928737 U CN204928737 U CN 204928737U
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China
Prior art keywords
diode
switching device
inductance
boost
boost circuit
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Expired - Fee Related
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CN201520556360.XU
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Chinese (zh)
Inventor
张庆海
李洪博
刘安华
蔡军
刘英倩
孔鹏
鲍景宽
郭维明
顾卫山
董海涛
张蕊
孙新生
张涛
张斌
郭亚峰
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Liaocheng Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Liaocheng Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The utility model discloses a photovoltaic power generation device based on two buck dc -to -ac converters, including photovoltaic array, boost boost circuit, the two buck dc -to -ac converters of three inductance. Boost boost circuit realizes that photovoltaic array output maximum power trails, two buck dc -to -ac converters adopt the two buck dc -to -ac converters of three inductance, exchange the utilization ratio that the alternative operation of positive and negative half -period of filter inductor has improved the filter inductor magnetic core, have reduced the volume weight of whole photovoltaic power generation device effectively, two direct current filter inductor further improve magnetic element's utilization ratio, still reduce the supplementary load loss of dc -to -ac converter simultaneously to photovoltaic power generation's efficiency and reliability have been improved.

Description

A kind of photovoltaic power generation apparatus based on dual Buck inverter
Technical field
The utility model relates to a kind of photovoltaic power generation apparatus based on dual Buck inverter, belongs to generation of electricity by new energy and intelligent grid field.
Background technology
In recent years, along with the aggravation of energy crisis and environmental pollution, the regenerative resources such as the solar energy as an alternative energy are used widely.Solar energy is converted into electric energy via Blast Furnace Top Gas Recovery Turbine Unit (TRT), then carries out transformation of electrical energy by power electronic equipment and make it to meet relevant criterion; Electric energy after conversion directly can be supplied to load, also can be incorporated to mains network.Inverter has been exactly the most frequently used power electronic equipment needed for energy conversion.But the reverse recovery current of the parasitic diode of bridge-type inverter switching tube is large, causes very large switching loss, limits the raising of switching frequency.In addition, also there is the problem of bridge arm direct pass in bridge-type inverter, greatly reduces the reliability of inverter.
In order to improve the reliability of inverter, mainly contain following two class methods: (1) adopts the little switching device of QRR to reduce the reverse recovery loss of bridge-type inverter fly-wheel diode; (2) inverter of not straight-through problem is adopted, as Z-source inverter and dual Buck inverter.Because Z-source inverter inductance is large, it is low to control complexity and power density and conversion efficiency, requires high airborne application scenario in power density and conversion efficiency, have not yet to see application.The brachium pontis of dual Buck inverter is the structure of switching tube and Diode series, and reversely restoring process is short, and electromagnetic interference is little; And have larger inductance between two switching tubes, therefore there is not the problem of bridge arm direct pass, reliability is high.
Summary of the invention
The technical problems to be solved in the utility model is: for the deficiencies in the prior art, has invented a kind of photovoltaic power generation apparatus based on dual Buck inverter, and Boost circuit realizes photovoltaic array Maximum Power Output and follows the tracks of; Dual Buck inverter adopts three inductance dual Buck inverters, and ac filter inductance positive and negative half period alternate run improves the utilance of filter inductance magnetic core, efficiently reduces the volume weight of whole photovoltaic power generation apparatus; Two DC filtering inductance improve the utilance of magnetic element further, also reduce the supplementary load loss of inverter simultaneously, thus improve efficiency and the reliability of photovoltaic generation.
The technical solution of the utility model is: a kind of photovoltaic power generation apparatus based on dual Buck inverter, comprises photovoltaic array, Boost circuit, three inductance dual Buck inverters, and the direct current energy that photovoltaic array exports is for conversion into AC energy, is load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching device S 0, Boost circuit diode D 0, DC side storage capacitor C 1and C 2; Three inductance dual Buck inverters comprise switching device S 1and anti-paralleled diode D s1, switching device S 1junction capacitance C s1, switching device S 2and anti-paralleled diode D s2, switching device S 2junction capacitance C s2, diode D 1and junction capacitance C d1, diode D 2and junction capacitance C d2, DC filtering inductance L dc1and L dc2, ac filter inductance L ac, filter capacitor C f, load; Photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching device S 0collector electrode, Boost circuit diode D 0anode be connected, Boost circuit diode D 0negative electrode and DC side storage capacitor C 1one end, switching device S 1collector electrode, anti-paralleled diode D s1negative electrode, diode D 2negative electrode be connected, DC side storage capacitor C 1the other end and DC side storage capacitor C 2one end be connected and ground connection, DC side storage capacitor C 2the other end and Boost circuit switching device S 0emitter, diode D 1anode, filter capacitor C fone end, switching device S 2emitter, anti-paralleled diode D s2anode, photovoltaic array output negative pole be connected, switching device S 1emitter and anti-paralleled diode D s1anode, diode D 1negative electrode, DC filtering inductance L dc1one end be connected, DC filtering inductance L dc1the other end and DC filtering inductance L dc2one end, ac filter inductance L acone end be connected, DC filtering inductance L dc2the other end and diode D 2anode, switching device S 2collector electrode, anti-paralleled diode D s2negative electrode be connected, ac filter inductance L acthe other end and filter capacitor C fthe other end be connected, load and filter capacitor C fbe connected in parallel, switching device S 1junction capacitance C s1be connected to switching device S 1collector and emitter between, switching device S 2junction capacitance C s2be connected to switching device S 2collector and emitter between, diode D 1junction capacitance C d1with diode D 1be connected in parallel, diode D 2junction capacitance C d2with diode D 2be connected in parallel.
The beneficial effects of the utility model: 1, Boost circuit realizes the tracking of photovoltaic array Maximum Power Output; Three inductance dual Buck inverter ac filter inductance positive and negative half period alternate runs improve the utilance of filter inductance magnetic core, efficiently reduce the volume weight of whole photovoltaic power generation apparatus; 2, two DC filtering inductance improve the utilance of magnetic element further, also reduce the supplementary load loss of inverter simultaneously, thus improve efficiency and the reliability of photovoltaic generation; If by two DC filtering inductance coupling high, not only improve the utilance of magnetic core further, and decrease two DC inductances and the parasitic supplementary load loss holding resonance and bring of power device, and during steady operation, do not have circulation to produce.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is the waveform schematic diagram of each inductive current of the utility model and output voltage.
Fig. 3 is switching device S 1conduction period DC filtering inductance L dc2current i ldc2crucial oscillogram in interrupted situation.
Fig. 4 is switching device S 1conduction period DC filtering inductance L dc2current i ldc2crucial oscillogram in continuous situation.
Embodiment
Below in conjunction with Figure of description, the technical solution of the utility model is further elaborated, but is not limited thereto.
Figure 1 shows that the photovoltaic power generation apparatus structural representation based on dual Buck inverter, comprise photovoltaic array, Boost circuit, three inductance dual Buck inverters, the direct current energy that photovoltaic array exports is for conversion into AC energy, is load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching device S 0, Boost circuit diode D 0, DC side storage capacitor C 1and C 2; Three inductance dual Buck inverters comprise switching device S 1and anti-paralleled diode D s1, switching device S 1junction capacitance C s1, switching device S 2and anti-paralleled diode D s2, switching device S 2junction capacitance C s2, diode D 1and junction capacitance C d1, diode D 2and junction capacitance C d2, DC filtering inductance L dc1and L dc2, ac filter inductance L ac, filter capacitor C f, load; Photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching device S 0collector electrode, Boost circuit diode D 0anode be connected, Boost circuit diode D 0negative electrode and DC side storage capacitor C 1one end, switching device S 1collector electrode, anti-paralleled diode D s1negative electrode, diode D 2negative electrode be connected, DC side storage capacitor C 1the other end and DC side storage capacitor C 2one end be connected and ground connection, DC side storage capacitor C 2the other end and Boost circuit switching device S 0emitter, diode D 1anode, filter capacitor C fone end, switching device S 2emitter, anti-paralleled diode D s2anode, photovoltaic array output negative pole be connected, switching device S 1emitter and anti-paralleled diode D s1anode, diode D 1negative electrode, DC filtering inductance L dc1one end be connected, DC filtering inductance L dc1the other end and DC filtering inductance L dc2one end, ac filter inductance L acone end be connected, DC filtering inductance L dc2the other end and diode D 2anode, switching device S 2collector electrode, anti-paralleled diode D s2negative electrode be connected, ac filter inductance L acthe other end and filter capacitor C fthe other end be connected, load and filter capacitor C fbe connected in parallel, switching device S 1junction capacitance C s1be connected to switching device S 1collector and emitter between, switching device S 2junction capacitance C s2be connected to switching device S 2collector and emitter between, diode D 1junction capacitance C d1with diode D 1be connected in parallel, diode D 2junction capacitance C d2with diode D 2be connected in parallel.
Boost circuit realizes photovoltaic array Maximum Power Output and follows the tracks of.To simplify the analysis, do following hypothesis: 1, because the switching frequency of inverter is far away higher than output voltage frequency, assuming that inverter output voltage U oinvariable in a switch periods; 2, DC side storage capacitor C 1and C 2voltage be impartial, be all U in; 3, DC filtering inductance L dc1=L dc2; 4, switching device S in a switch periods 1conduction period, owing to flowing through DC filtering inductance L dc2current i ldc2much smaller than flowing through DC filtering inductance L dc1current i ldc1, therefore can think L dc1and L acseries connection dividing potential drop, three inductance intersection point voltage U dfor definite value: U o+ (U in-U o) L ac/ (L dc1+ L ac); In like manner at S 1blocking interval, U dvalue be: U o-(U in+ U o) L ac/ (L dc1+ L ac).
Figure 2 shows that the waveform schematic diagram of each inductive current and output voltage.Because inductive current is different with output voltage phase place, within an inverter output cycle, comprise negative sense energy feedback stage, forward energy transfer stages, forward energy feedback stage and 4 stages of negative sense energy transfer stages, each stage comprises again some mode of operations; Wherein the ac filter inductive current of negative sense energy feedback stage and forward energy transfer stages is just, switching device S 1work, S 2do not work.With ac filter inductive current i lacfor timing inverter operating state is analyzed, i lacfor time negative, the operating state of inverter is similar.Due to the change of duty ratio and load, switching device S 1conduction period DC filtering inductance L dc2current i ldc2there will be interrupted and continuous two kinds of situations.I ldc2in interrupted situation shown in crucial oscillogram 3; i ldc2as shown in Figure 4, its operational modal analysis is shown in i to the key waveforms of consecutive hours ldc2the model analysis of interrupted situation, no longer describes.
I ldc26 operation intervals can be divided into, below in conjunction with each operation mode of the labor of key waveforms shown in Fig. 3 in interrupted situation.
1, operation mode 1 [t 0-t 1]: at t 0moment switching device S 1conducting, S 2, D 1and D 2all turn off, input power 2U in, L dc1, L dc2with junction capacitance C s2the loop formed is to C s2charging, C d2through L dc1, L dc2discharge, inductive current i ldc1, i ldc2resonance rises, C s2both end voltage rises, C d2both end voltage declines.Until C d2voltage drop is zero, C s2voltage rise is 2U intime this operation mode terminate.
2, operation mode 2 [t 1-t 2]: at t 1moment C d2after both end voltage drops to zero, D 2nature conducting afterflow, now, S 1still conducting, S 2and D 1all turn off, current i ldc1linear rising, current i ldc2linear decline; Current i ldc2drop to zero this operation mode to terminate.
3, operation mode 3 [t 2-t 3]: at t 2moment current i ldc2drop to zero, now D 2turn off, electric capacity C d2, C s2and inductance L dc2resonance, due to L dc1<L ac, therefore i ldc2can be approximated to be zero.As switching device S 1turn off, this operation mode terminates.
4, operation mode 4 [t 3-t 4]: at t 3moment switching device S 1turn off, D 1conducting afterflow, S 2, S 1and D 2all turn off, C d2through input power 2U in, L dc1, L dc2and D 1charge in loop, C s2through L dc1, L dc2and D 1discharge in loop, L dc2the reverse resonance of electric current rises, C d2both end voltage rises, C s2both end voltage declines; Until C s2voltage drop is zero, C d2voltage rise is 2U intime this operation mode terminate.
5, operation mode 5 [t 4-t 5]: at t 4moment C s2both end voltage drops to zero, switching device S 2body diode D s2conducting afterflow, now, D 1still conducting, S 1, S 2and D 2all turn off; Current i ldc1linear decline, i ldc2reverse linear declines; i ldc2when being zero, this operation mode terminates.
6, operation mode 6 [t 5-t 6]: at t 5moment i ldc2be zero, electric capacity C d2, C s2and inductance L dc2resonance, switching device S 1during conducting, this mode terminates.

Claims (1)

1. based on a photovoltaic power generation apparatus for dual Buck inverter, it is characterized in that, comprise photovoltaic array, Boost circuit, three inductance dual Buck inverters, the direct current energy that photovoltaic array exports is for conversion into AC energy, is load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching device S 0, Boost circuit diode D 0, DC side storage capacitor C 1and C 2; Three inductance dual Buck inverters comprise switching device S 1and anti-paralleled diode D s1, switching device S 1junction capacitance C s1, switching device S 2and anti-paralleled diode D s2, switching device S 2junction capacitance C s2, diode D 1and junction capacitance C d1, diode D 2and junction capacitance C d2, DC filtering inductance L dc1and L dc2, ac filter inductance L ac, filter capacitor C f, load; Photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching device S 0collector electrode, Boost circuit diode D 0anode be connected, Boost circuit diode D 0negative electrode and DC side storage capacitor C 1one end, switching device S 1collector electrode, anti-paralleled diode D s1negative electrode, diode D 2negative electrode be connected, DC side storage capacitor C 1the other end and DC side storage capacitor C 2one end be connected and ground connection, DC side storage capacitor C 2the other end and Boost circuit switching device S 0emitter, diode D 1anode, filter capacitor C fone end, switching device S 2emitter, anti-paralleled diode D s2anode, photovoltaic array output negative pole be connected, switching device S 1emitter and anti-paralleled diode D s1anode, diode D 1negative electrode, DC filtering inductance L dc1one end be connected, DC filtering inductance L dc1the other end and DC filtering inductance L dc2one end, ac filter inductance L acone end be connected, DC filtering inductance L dc2the other end and diode D 2anode, switching device S 2collector electrode, anti-paralleled diode D s2negative electrode be connected, ac filter inductance L acthe other end and filter capacitor C fthe other end be connected, load and filter capacitor C fbe connected in parallel, switching device S 1junction capacitance C s1be connected to switching device S 1collector and emitter between, switching device S 2junction capacitance C s2be connected to switching device S 2collector and emitter between, diode D 1junction capacitance C d1with diode D 1be connected in parallel, diode D 2junction capacitance C d2with diode D 2be connected in parallel.
CN201520556360.XU 2015-07-29 2015-07-29 Photovoltaic power generation device based on two buck dc -to -ac converters Expired - Fee Related CN204928737U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109586603A (en) * 2018-09-03 2019-04-05 中国石油大学(华东) The double SEPIC bucks of modularization export the combined inverter of inverse parallel
CN110149068A (en) * 2019-04-24 2019-08-20 南京航空航天大学 A kind of double Buck full-bridge inverters of aspergillus ficuum three-phase and its control strategy
CN111404405A (en) * 2020-04-28 2020-07-10 上海纵青新能源科技有限公司 Step-down rectification circuit and wireless charging vehicle end control unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109586603A (en) * 2018-09-03 2019-04-05 中国石油大学(华东) The double SEPIC bucks of modularization export the combined inverter of inverse parallel
CN110149068A (en) * 2019-04-24 2019-08-20 南京航空航天大学 A kind of double Buck full-bridge inverters of aspergillus ficuum three-phase and its control strategy
CN111404405A (en) * 2020-04-28 2020-07-10 上海纵青新能源科技有限公司 Step-down rectification circuit and wireless charging vehicle end control unit
CN111404405B (en) * 2020-04-28 2020-11-17 上海纵青新能源科技有限公司 Step-down rectification circuit and wireless charging vehicle end control unit

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