CN204696955U - A kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance - Google Patents

A kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance Download PDF

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Publication number
CN204696955U
CN204696955U CN201520385923.3U CN201520385923U CN204696955U CN 204696955 U CN204696955 U CN 204696955U CN 201520385923 U CN201520385923 U CN 201520385923U CN 204696955 U CN204696955 U CN 204696955U
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China
Prior art keywords
switching
paralleled diode
collector electrode
emitter
boost
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Expired - Fee Related
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CN201520385923.3U
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Chinese (zh)
Inventor
张庆海
王李*
李洪博
刘安华
王新涛
蔡军
孔鹏
鲍景宽
石星昊
张蕊
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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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The utility model relates to a kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance, comprise Boost circuit, auxiliary resonance circuit, PWM inverter bridge, photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects in turn, and the direct current energy that photovoltaic array exports being for conversion into AC energy is also three-phase resistance sense load supplying.Boost circuit realizes photovoltaic array Maximum Power Output and follows the tracks of, and auxiliary resonance circuit provides zero voltage switch condition for PWM converter bridge switching parts device; PWM inverter bridge does not need short circuit in the course of work, and the no-voltage duration can be selected arbitrarily as required, does not rely on load current and resonant parameter; Main switch and auxiliary switch can realize Sofe Switch, do not need to set the inductive current threshold value relevant with load to the control of the resonant circuit course of work.The utility model improves the efficiency of photovoltaic generation, is applicable to high-performance, powerful photovoltaic generating system.

Description

A kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance
Technical field
The utility model relates to a kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance, belongs to Technics of Power Electronic Conversion and intelligent grid field.
Background technology
The global energy important channel with problem of environmental pollution in short supply is alleviated in the utilization of solar energy, and photovoltaic generation is exactly one of focus of Recent study.Adopt at present ripe electric electronic current change technology to convert solar energy to electric energy, and then realize voltage transformation and power controls.
On the other hand, along with the development of power electronic technology and the popularization and application of power electronic equipment, high-performance, high efficiency and high power density become the major demands of power electronic equipment.In order to realize this target, power inverter has to operate at higher switching frequency, but high frequency will worsen the electromagnetic compatibility level of converter and reduce system effectiveness.In addition, the increase of switching loss certainly will cause the increase of radiator volume and weight, the further raising of restriction inverter power density.
Summary of the invention
On the basis of existing technology, the utility model discloses a kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance, Boost circuit realizes photovoltaic array Maximum Power Output and follows the tracks of, and auxiliary resonance circuit provides zero voltage switch condition for PWM converter bridge switching parts device.The switching device of PWM inverter bridge turns off or open-minded during the input voltage of PWM inverter bridge is no-voltage, the overlap of no-voltage and electric current during power device switch, thus reduces switching loss.Utilize the resonance between the equivalent inductance of high frequency transformer and resonant capacitance, the input voltage of PWM inverter bridge is made periodically to drop to zero, realize converter bridge switching parts device and complete switching under zero voltage condition, auxiliary switch device also can realize zero voltage switching or zero current switching, and the reverse recovery loss of diode is also effectively reduced.In addition, the main switch of inverter and auxiliary switch can realize Sofe Switch, the voltage that all switching devices bear all is no more than DC side storage capacitor voltage, and auxiliary resonance circuit only works once in each switch periods, reduce the loss of auxiliary resonance circuit, improve the efficiency of photovoltaic generation, be applicable to high-performance, powerful photovoltaic generating system.
The technical solution of the utility model is: a kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance, comprise Boost circuit, auxiliary resonance circuit, PWM inverter bridge, photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects in turn, and the direct current energy that photovoltaic array exports being for conversion into AC energy is also three-phase resistance sense 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 1, auxiliary resonance circuit comprises transformer, auxiliary switch device S a1, S a2, S a3and respective anti-paralleled diode D a1, D a2, D a3, the former vice-side winding turn ratio of transformer is 1:n; PWM inverter bridge adopts three phase full bridge inverter structure, by six switching device S 1~ S 6and their respective anti-paralleled diode D 1~ D 6composition, and six switching device S 1~ S 6collector electrode and emitter between all and be connected with buffer capacitor C s; 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, auxiliary switch device S a1collector electrode, anti-paralleled diode D a1negative electrode, auxiliary switch device S a2collector electrode, anti-paralleled diode D a2negative electrode be connected, DC side storage capacitor C 1the other end and photovoltaic array output negative pole, Boost circuit switching device S 0emitter, transformer secondary winding output, transformer primary side winding output, switching device S 2emitter, anti-paralleled diode D 2anode, switching device S 4emitter, anti-paralleled diode D 4anode, switching device S 6emitter, anti-paralleled diode D 6anode be connected, auxiliary switch device S a2emitter and anti-paralleled diode D a2anode, transformer secondary winding input be connected, auxiliary switch device S a1emitter and anti-paralleled diode D a1anode, auxiliary switch device S a3collector electrode, anti-paralleled diode D a3negative electrode, switching device S 1collector electrode, anti-paralleled diode D 1negative electrode, switching device S 3collector electrode, anti-paralleled diode D 3negative electrode, switching device S 5collector electrode, anti-paralleled diode D 5negative electrode be connected, auxiliary switch device S a3emitter and anti-paralleled diode D a3anode, transformer primary side winding input be connected, switching device S 1emitter and anti-paralleled diode D 1anode, switching device S 2collector electrode, anti-paralleled diode D 2negative electrode be connected, switching device S 3emitter and anti-paralleled diode D 3anode, switching device S 4collector electrode, anti-paralleled diode D 4negative electrode be connected, switching device S 5emitter and anti-paralleled diode D 5anode, switching device S 6collector electrode, anti-paralleled diode D 6negative electrode be connected; By switching device S 2collector electrode, switching device S 4collector electrode, switching device S 6collector electrode draw a, b, c tri-outputs of PWM inverter bridge respectively, and be connected to three-phase resistance inductive load.
The beneficial effects of the utility model are: 1, utilize the leakage inductance of transformer and the resonance of resonant capacitance in auxiliary resonance circuit, and the input voltage realizing PWM inverter bridge periodically drops to zero; 2, without series connection derided capacitors, without the variation issue of neutral point potential; 3, the main switch of inverter and auxiliary switch can realize Sofe Switch, and the voltage born is no more than DC side storage capacitor voltage; 4, PWM inverter bridge does not need short circuit in the course of work, and the no-voltage duration does not rely on load current and resonant parameter, and its no-voltage duration can be selected arbitrarily as required; 5, do not need to set the inductive current threshold value relevant with load to the control of the resonant circuit course of work; 6, improve the efficiency of photovoltaic generation, be applicable to high-performance, powerful photovoltaic generating system.
Accompanying drawing explanation
Fig. 1 is the utility model topological structure schematic diagram.
Fig. 2 is the utility model equivalent circuit diagram.
Fig. 3 is utility model works mode 1 schematic diagram.
Fig. 4 is utility model works mode 2 schematic diagram.
Fig. 5 is utility model works mode 3 schematic diagram.
Fig. 6 is utility model works mode 4 schematic diagram.
Fig. 7 is utility model works mode 5 schematic diagram.
Fig. 8 is utility model works mode 6 schematic diagram.
Fig. 9 is utility model works mode 7 schematic diagram.
Figure 10 is utility model works mode 8 schematic diagram.
Embodiment
Figure 1 shows that the photovoltaic DC-to-AC converter topological structure schematic diagram adopting transformer auxiliary resonance, comprise Boost circuit, auxiliary resonance circuit, PWM inverter bridge, photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects in turn, and the direct current energy that photovoltaic array exports being for conversion into AC energy is also three-phase resistance sense 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 1, auxiliary resonance circuit comprises transformer, auxiliary switch device S a1, S a2, S a3and respective anti-paralleled diode D a1, D a2, D a3, the former vice-side winding turn ratio of transformer is 1:n; PWM inverter bridge adopts three phase full bridge inverter structure, by six switching device S 1~ S 6and their respective anti-paralleled diode D 1~ D 6composition, and six switching device S 1~ S 6collector electrode and emitter between all and be connected with buffer capacitor C s; 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, auxiliary switch device S a1collector electrode, anti-paralleled diode D a1negative electrode, auxiliary switch device S a2collector electrode, anti-paralleled diode D a2negative electrode be connected, DC side storage capacitor C 1the other end and photovoltaic array output negative pole, Boost circuit switching device S 0emitter, transformer secondary winding output, transformer primary side winding output, switching device S 2emitter, anti-paralleled diode D 2anode, switching device S 4emitter, anti-paralleled diode D 4anode, switching device S 6emitter, anti-paralleled diode D 6anode be connected, auxiliary switch device S a2emitter and anti-paralleled diode D a2anode, transformer secondary winding input be connected, auxiliary switch device S a1emitter and anti-paralleled diode D a1anode, auxiliary switch device S a3collector electrode, anti-paralleled diode D a3negative electrode, switching device S 1collector electrode, anti-paralleled diode D 1negative electrode, switching device S 3collector electrode, anti-paralleled diode D 3negative electrode, switching device S 5collector electrode, anti-paralleled diode D 5negative electrode be connected, auxiliary switch device S a3emitter and anti-paralleled diode D a3anode, transformer primary side winding input be connected, switching device S 1emitter and anti-paralleled diode D 1anode, switching device S 2collector electrode, anti-paralleled diode D 2negative electrode be connected, switching device S 3emitter and anti-paralleled diode D 3anode, switching device S 4collector electrode, anti-paralleled diode D 4negative electrode be connected, switching device S 5emitter and anti-paralleled diode D 5anode, switching device S 6collector electrode, anti-paralleled diode D 6negative electrode be connected; By switching device S 2collector electrode, switching device S 4collector electrode, switching device S 6collector electrode draw a, b, c tri-outputs of PWM inverter bridge respectively, and be connected to three-phase resistance inductive load.
Boost circuit realizes photovoltaic array Maximum Power Output and follows the tracks of, and auxiliary resonance circuit provides zero voltage switch condition for PWM converter bridge switching parts device.The switching device of PWM inverter bridge turns off or open-minded during the input voltage of PWM inverter bridge is no-voltage, the overlap of no-voltage and electric current during power device switch, thus reduces switching loss.
To simplify the analysis, following hypothesis is done: 1, device is ideal operation state; 2, photovoltaic array and Boost circuit are equivalent to a DC power supply E; 2, load inductance is much larger than resonant inductance, and the load current of PWM converter bridge switching parts status transition moment can think constant-current source I 0, load current direction remains unchanged, and its numerical value depends on the instantaneous value of each phase current and the on off state of PWM inverter bridge 6 switching devices; 3,6 switching devices of PWM inverter bridge are equivalent to S inv, the antiparallel fly-wheel diode of switching device is equivalent to D inv; 4,6 buffer capacitor C of PWM inverter bridge sbe equivalent to C r, get C r=3C s, when this is the switching device connection due to the upper and lower any one party of each brachium pontis of PWM inverter bridge, all make the electric capacity C in parallel with it sshort circuit, electric capacity during normal work on 3 brachium pontis is equivalent to 3 Capacitance parallel connections.
On above four assumption basis, the photovoltaic DC-to-AC converter equivalent circuit diagram adopting transformer auxiliary resonance shown in Fig. 2 can be obtained.In Fig. 2, i sa1represent and flow through auxiliary switch device S a1electric current, u crrepresent electric capacity C rthe voltage at two ends; The equivalent inductance of transformer is L r, L l1and L l2be respectively the leakage inductance of transformer primary vice-side winding, L m1and L m2be respectively the magnetizing inductance of transformer primary vice-side winding, the equivalent inductance of transformer is L r=L l1+ L l2/ n 2, the current value of transformer primary vice-side winding meets i lrs=i lr/ n.Load current I 0flow through with direction shown in Fig. 2, the current/voltage of each several part is just all with the direction shown in Fig. 2.
The utility model can be divided into 8 operation modes in a switch periods, and the schematic diagram of 8 operation modes respectively as shown in Figures 3 to 10.Respectively each operation mode is introduced below.
Operation mode 1(t ~ t 0): initial condition, DC power supply E is by auxiliary switch device S a1to Load transportation electric energy, circuit working is in stable state.
Operation mode 2(t 0~ t 1): at t 0in the moment, turn off auxiliary switch device S a1, open auxiliary switch device S simultaneously a3.At electric capacity C reffect under, reduce S a1the climbing of shutdown moment terminal voltage, so S a1achieve zero voltage turn-off; Under the effect of transformer inductance, reduce and flow through auxiliary switch device S a3the climbing of electric current, so S a3achieve zero current turning-on.From t 0moment, electric capacity C rwith the equivalent inductance L of transformer rstart resonance, C rto L relectric discharge, C rboth end voltage u crreduce gradually, the current i of transformer primary vice-side winding lrand i lrsall start to increase, D a2conducting.In resonant process, work as u crwhen being reduced to E/n gradually, i lrbe increased to maximum, then i lrstart to reduce, at t 1moment i lrwhen being reduced to zero, mode of operation 2 terminates.In resonant process, C rexcept to L rbeyond the branch road electric discharge of place, also simultaneously to load discharge, constant to maintain load current.
Operation mode 3(t 1~ t 2): at t 1in the moment, resonant process terminates, and turns off auxiliary switch device S a3, because now i lrbe reduced to zero, so S a3achieve zero-current switching.From t 1moment, C ronly to load discharge, flow through C relectric current equal I 0, u crlinear reduction.At t 2in the moment, work as u crwhen being reduced to zero, mode of operation 3 terminates.
Operation mode 4(t 2~ t 3): PWM inverter bridge fly-wheel diode and load current form loop, sustained diode invconducting, PWM converter bridge switching parts device can complete a zero voltage switch process, and the duration of this pattern can set arbitrarily as required.
Operation mode 5(t 3~ t 4): at t 3in the moment, open auxiliary switch device S a2, under the effect of transformer inductance, reduce and flow through auxiliary switch device S a2the climbing of electric current, so S a2achieve zero current turning-on.From t 3moment, the current i of transformer primary vice-side winding lrand i lrsall start linear increase, D a3conducting.Along with i lrreverse linear increase, flow through D invelectric current reduce gradually.At t 4in the moment, work as i lrreverse linear increases and load current I 0time equal, D invnaturally end, reduce D invreverse recovery loss, mode of operation 5 terminates.
Operation mode 6(t 4~ t 5): from t 4moment, electric capacity C rwith the equivalent inductance L of transformer rstart resonance, i lrcontinue oppositely to increase, u crstart to increase gradually from zero, work as u crwhen increasing to E/n, i lroppositely increase to maximum, then i lrstart oppositely to reduce, u crcontinue to increase.At t 5in the moment, work as u crwhen increasing to E, resonant process terminates, and mode of operation 6 terminates.
Operation mode 7(t 5~ t 6): at t 5in the moment, open auxiliary switch device S a1, because u cr=E, so at electric capacity C reffect under, S a1achieve no-voltage open-minded.Because i lrat t 5moment value i lr(t 5) absolute value be greater than I 0, so from t 5moment, D a1conducting, i lrfrom i lr(t 5) start reverse linear reduction.At t 6in the moment, work as i lroppositely be reduced to I 0time, D a1naturally end, reduce reverse recovery loss, mode of operation 7 terminates.
Operation mode 8(t 6~ t 7): from t 6moment, i lrcontinue reverse linear to reduce, flow through S a1current i sa1linear increase.Work as i lrbe reduced to zero, i sa1increase to I 0time, turn off auxiliary switch device S a2, because now i lrsalso zero is reduced to, so S a2achieve zero-current switching, mode of operation 8 terminates.

Claims (1)

1. one kind adopts the photovoltaic DC-to-AC converter of transformer auxiliary resonance, it is characterized in that, comprise Boost circuit, auxiliary resonance circuit, PWM inverter bridge, photovoltaic array, Boost circuit, auxiliary resonance circuit, PWM inverter bridge, three-phase resistance inductive load connects in turn, and the direct current energy that photovoltaic array exports being for conversion into AC energy is also three-phase resistance sense 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 1, auxiliary resonance circuit comprises transformer, auxiliary switch device S a1, S a2, S a3and respective anti-paralleled diode D a1, D a2, D a3, the former vice-side winding turn ratio of transformer is 1:n; PWM inverter bridge adopts three phase full bridge inverter structure, by six switching device S 1~ S 6and their respective anti-paralleled diode D 1~ D 6composition, and six switching device S 1~ S 6collector electrode and emitter between all and be connected with buffer capacitor C s; 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, auxiliary switch device S a1collector electrode, anti-paralleled diode D a1negative electrode, auxiliary switch device S a2collector electrode, anti-paralleled diode D a2negative electrode be connected, DC side storage capacitor C 1the other end and photovoltaic array output negative pole, Boost circuit switching device S 0emitter, transformer secondary winding output, transformer primary side winding output, switching device S 2emitter, anti-paralleled diode D 2anode, switching device S 4emitter, anti-paralleled diode D 4anode, switching device S 6emitter, anti-paralleled diode D 6anode be connected, auxiliary switch device S a2emitter and anti-paralleled diode D a2anode, transformer secondary winding input be connected, auxiliary switch device S a1emitter and anti-paralleled diode D a1anode, auxiliary switch device S a3collector electrode, anti-paralleled diode D a3negative electrode, switching device S 1collector electrode, anti-paralleled diode D 1negative electrode, switching device S 3collector electrode, anti-paralleled diode D 3negative electrode, switching device S 5collector electrode, anti-paralleled diode D 5negative electrode be connected, auxiliary switch device S a3emitter and anti-paralleled diode D a3anode, transformer primary side winding input be connected, switching device S 1emitter and anti-paralleled diode D 1anode, switching device S 2collector electrode, anti-paralleled diode D 2negative electrode be connected, switching device S 3emitter and anti-paralleled diode D 3anode, switching device S 4collector electrode, anti-paralleled diode D 4negative electrode be connected, switching device S 5emitter and anti-paralleled diode D 5anode, switching device S 6collector electrode, anti-paralleled diode D 6negative electrode be connected; By switching device S 2collector electrode, switching device S 4collector electrode, switching device S 6collector electrode draw a, b, c tri-outputs of PWM inverter bridge respectively, and be connected to three-phase resistance inductive load.
CN201520385923.3U 2015-06-07 2015-06-07 A kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance Expired - Fee Related CN204696955U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105576984A (en) * 2016-02-26 2016-05-11 北京交通大学 Soft switching isolation DC-DC converter for train auxiliary power supply
CN106130348A (en) * 2016-06-29 2016-11-16 上海交通大学 Realize the auxiliary circuit of Sofe Switch and the buck translation circuit with this auxiliary circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105576984A (en) * 2016-02-26 2016-05-11 北京交通大学 Soft switching isolation DC-DC converter for train auxiliary power supply
CN106130348A (en) * 2016-06-29 2016-11-16 上海交通大学 Realize the auxiliary circuit of Sofe Switch and the buck translation circuit with this auxiliary circuit
CN106130348B (en) * 2016-06-29 2019-09-27 上海交通大学 Realize the auxiliary circuit of Sofe Switch and the buck translation circuit with the auxiliary circuit

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