CN105337520A - Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance - Google Patents
Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance Download PDFInfo
- Publication number
- CN105337520A CN105337520A CN201510925904.XA CN201510925904A CN105337520A CN 105337520 A CN105337520 A CN 105337520A CN 201510925904 A CN201510925904 A CN 201510925904A CN 105337520 A CN105337520 A CN 105337520A
- Authority
- CN
- China
- Prior art keywords
- switching tube
- photovoltaic
- boost chopper
- photovoltaic grid
- connected converter
- 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
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 238000013519 translation Methods 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000004378 air conditioning Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
-
- H02J3/385—
-
- 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 photovoltaic grid-connected converter, a photovoltaic power supply system and an electric appliance. The photovoltaic grid-connected converter comprises a boosting chopper, a by-pass switch and a conversion circuit, wherein the boosting chopper is connected with a photovoltaic array and used for performing boosting conversion on output voltage of the photovoltaic array, the by-pass switch is connected with the boosting chopper in parallel and used for bypassing the boosting chopper when the output voltage of the photovoltaic array exceeds a preset voltage threshold value, and the conversion circuit is connected with the output end of the boosting chopper and used for performing direct-current and alternating-current conversion on output currents of the boosting chopper. Through the photovoltaic grid-connected converter, the problem that in related technologies, the conversion efficiency of a photovoltaic grid-connected converter is low is solved.
Description
Technical field
The present invention relates to appliance field, in particular to a kind of photovoltaic grid-connected converter, photovoltaic power supply system and electrical equipment.
Background technology
In the developmental research of new forms of energy, alternating current-direct current mixing micro-capacitance sensor is the important step of application new forms of energy, and the alternating current-direct current mixing micro-capacitance sensor of research as He Jianshe more efficient stable is the inexorable trend that new energy development application technology develops.Wherein, bidirectional, dc exchanges (AC/DC) converter and is connected DC bus and ac bus, mutual conversion between can carrying out direct current and exchange, also carry the multi-tasks such as function switching, power delivery, the Effec-tive Function of research AC/DC converter has very important meaning for the reliability and efficiency improving alternating current-direct current mixing micro-grid system.In Photovoltaic new energy generating occasion, the voltage range exported due to photovoltaic array is narrower, completes conversion again after needing photovoltaic grid-connected converter to boost to photovoltaic array output voltage, and the operating efficiency of photovoltaic grid-connected converter conversion is lower.
For the problem that photovoltaic grid-connected converter conversion efficiency in correlation technique is lower, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is to provide a kind of photovoltaic grid-connected converter, photovoltaic power supply system and electrical equipment, to solve the problem that in correlation technique, photovoltaic grid-connected converter conversion efficiency is lower.
To achieve these goals, according to an aspect of the present invention, a kind of photovoltaic grid-connected converter is provided.This photovoltaic grid-connected converter comprises: boost chopper, is connected with photovoltaic array, for carrying out boosting inverter to the output voltage of photovoltaic array; By-pass switch, in parallel with boost chopper, for the bypass Boost chopper when the output voltage of photovoltaic array exceeds predetermined voltage threshold; And translation circuit, be connected with the output of boost chopper, carry out DC-AC conversion for the electric current exported boost chopper.
Further, this photovoltaic grid-connected converter also comprises: voltage hysteresis compares tracker, is arranged between boost chopper and photovoltaic array, for the input voltage of stable boost chopper.
Further, the input of boost chopper and the input of by-pass switch are connected to the first circuit node, and voltage hysteresis compares tracker and is arranged between the first circuit node and photovoltaic array.
Further, photovoltaic grid-connected converter adopts the double-closed-loop control structure of outer voltage, current inner loop, and this photovoltaic grid-connected converter also comprises: track with zero error device, is arranged in current inner loop.
Further, boost chopper comprises: inductance, and the first end of inductance is as the first input end of boost chopper; Diode, the first end of diode is connected with the second end of inductance, and the second end of diode is the first output of boost chopper; First switching tube, the first end of the first switching tube is connected with the first end of diode; First electric capacity, the first end of the first electric capacity is connected with the second end of diode, as the second input of boost chopper; And second electric capacity, the first end ground connection of the second electric capacity, and be connected with the second end of the first electric capacity, the second end of the second electric capacity is connected with the second end of the first switching tube, as the second output of boost chopper.
Further, by-pass switch is connected in parallel on the first end of inductance and the second end of diode;
Further, translation circuit comprises: second switch pipe, and the first end of second switch pipe is connected with the first end of the first electric capacity, as the first end of translation circuit; 3rd switching tube, the 3rd closes the first end of pipe is connected with the second end of second switch pipe, and the second end of the 3rd switching tube is connected with the second end of the second electric capacity, and as the second end of translation circuit, second switch Guan Yu tri-switching tube is in the same way; 4th switching tube, the first end of the 4th switching tube is connected with the second end of the first electric capacity; And the 5th switching tube, the first end of the 5th switching tube is connected with the second end of the 4th switching tube, and the second end of the 5th switching tube is connected with the second end of second switch pipe, as the 3rd end of translation circuit, the 4th switching tube and the 5th switching tube reverse.
Further, this photovoltaic grid-connected converter also comprises: MPPT maximum power point tracking device, is arranged between boost chopper and photovoltaic array, for the peak power output of tracking photovoltaic array.
To achieve these goals, according to an aspect of the present invention, a kind of photovoltaic power supply system is provided.This photovoltaic power supply system comprises: the photovoltaic grid-connected converter of the embodiment of the present invention; And Intelligent Power Module, be arranged between photovoltaic grid-connected converter and electrical equipment, be connected in parallel on the first output of boost chopper and the second output of boost chopper, for the direct current of drawing from photovoltaic grid-connected converter is converted to three-phase alternating current.
Further, Intelligent Power Module comprises: the first switching tube group, comprises the 6th switching tube and the 7th switching tube of series connection, draws the first-phase node of output current between the 6th switching tube and the 7th switching tube; Second switch pipe group, in parallel with the first switching tube group, comprise the 8th switching tube and the 9th switching tube of series connection, between the 8th switching tube and the 9th switching tube, draw the second-phase node of output current; And the 3rd switching tube group, in parallel with the first switching tube group, comprise the tenth switching tube and the 11 switching tube of series connection, between the tenth switching tube and the 11 switching tube, draw the third phase node of output current.
Further, this photovoltaic power supply system also comprises: filter capacitor, filter capacitor is in parallel with Intelligent Power Module.
To achieve these goals, according to an aspect of the present invention, provide a kind of electrical equipment, comprise photovoltaic power supply system provided by the invention.
Further, this electrical equipment is air-conditioning.
The present invention carries out boosting inverter by arranging the boost chopper be connected with photovoltaic array to the output voltage of photovoltaic array; The by-pass switch in parallel with boost chopper is set, the bypass Boost chopper when the output voltage of photovoltaic array exceeds predetermined voltage threshold, and the translation circuit be connected with boost chopper output is set, DC-AC conversion is carried out to the electric current that boost chopper exports, solves the problem that in correlation technique, photovoltaic grid-connected converter conversion efficiency is lower.Photovoltaic grid-connected converter can be selected to be in band boost chopper and two kinds of mode of operations not with boost chopper by by-pass switch, and then improve the conversion efficiency of photovoltaic grid-connected converter.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of photovoltaic grid-connected converter according to a first embodiment of the present invention;
Fig. 2 is the schematic diagram of the track with zero error block diagram of photovoltaic grid-connected converter according to the embodiment of the present invention;
Fig. 3 is the schematic diagram of the double-direction control structured flowchart of photovoltaic grid-connected converter according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of photovoltaic grid-connected converter according to a second embodiment of the present invention;
Fig. 5 is the schematic diagram of photovoltaic power supply system according to a first embodiment of the present invention; And
Fig. 6 is the schematic diagram of photovoltaic power supply system according to a second embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The application's scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the embodiment of the application's part, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
It should be noted that, term " first ", " second " etc. in the specification of the application and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that the embodiment of the application described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
The embodiment provides a kind of photovoltaic grid-connected converter.
Fig. 1 is the schematic diagram of photovoltaic grid-connected converter according to a first embodiment of the present invention.As shown in Figure 1, this photovoltaic grid-connected converter comprises: boost chopper 10, by-pass switch 20 and translation circuit 30.
Boost chopper 10, is connected with photovoltaic array, for carrying out boosting inverter to the output voltage of photovoltaic array; By-pass switch 20, in parallel with boost chopper 10, for the bypass Boost chopper 10 when the output voltage of photovoltaic array exceeds predetermined voltage threshold; And translation circuit 30, be connected with the output of boost chopper 10, carry out DC-AC conversion for the electric current exported boost chopper 10.The boost chopper 10 of the present embodiment adopts timesharing to start and controls, when the output voltage of photovoltaic array is lower, by-pass switch 20 is opened, boost chopper 10 works, the output voltage of boost chopper 10 pairs of photovoltaic arrays carries out boosting inverter, make the voltage stabilization of DC bus on the minimum DC voltage value that the translation circuit 30 of rear class is required by direct current and in ac grid system, now, the mode of operation of photovoltaic grid-connected converter is Bi-level mode; After the output voltage of photovoltaic array exceedes the grid-connected required minimum DC voltage value certain value of translation circuit 30, by-pass switch 20 closes, and by boost chopper 10 bypass, boost chopper 10 is quit work, now, photovoltaic grid-connected converter works in single mode.Switch is carried out according to the comparative result of the output voltage of photovoltaic array and predetermined voltage threshold by by-pass switch 20, the switching of photovoltaic grid-connected converter different working modes can be realized, when Bi-level mode, improve to greatest extent photovoltaic array output voltage can working range, realize wide-voltage range input, extend the power grade of converter, when single mode, do not carry out boosting inverter, improve the operating efficiency of photovoltaic grid-connected converter.
Preferably, this photovoltaic grid-connected converter can also comprise voltage hysteresis and compare tracker, and voltage hysteresis compares tracker and can be arranged between boost chopper 10 and photovoltaic array, for the input voltage of stable boost chopper 10.When fluctuating near the minimum DC voltage value needed for translation circuit 30 for avoiding the output voltage of photovoltaic array, the frequent switch of by-pass switch 20 may be caused, cause boost chopper 10 to start frequently, stop.So not only affect the stability that photovoltaic grid-connected converter exports, also can cause the loss of photovoltaic array power output.A voltage hysteresis can be introduced compare tracker in photovoltaic grid-connected converter, be arranged between boost chopper 10 and photovoltaic array.Voltage hysteresis compares tracker can the output voltage of light stable photovoltaic array, also, can stablize the input voltage of boost chopper 10, prevent the output voltage of photovoltaic array high-frequency fluctuation near the minimum DC voltage value needed for translation circuit 30.Compare tracker by voltage hysteresis, taking over seamlessly between the single mode of photovoltaic grid-connected converter and Bi-level mode can be realized, effectively expand the operating voltage range of photovoltaic grid-connected converter, improve conversion efficiency.Preferably, the input of boost chopper 10 and the input of by-pass switch 20 are connected to the first circuit node, and voltage hysteresis compares tracker and is arranged between the first circuit node and photovoltaic array.
Preferably, photovoltaic grid-connected converter adopts the double-closed-loop control structure of outer voltage, current inner loop, and this photovoltaic grid-connected converter also comprises track with zero error device, is arranged in current inner loop.Outer voltage is used for when photovoltaic grid-connected converter is operated in rectification state, plays the effect of stable DC busbar voltage; Current inner loop is used for when photovoltaic grid-connected converter is operated in rectification state or inverter mode, and the alternating current controlling power transmission network side follows the tracks of alternating voltage.In traditional double-closed-loop control structure, what current inner loop adopted is proportional integral (PI) controller, the Selecting parameter relative complex of PI controller, easily cause current resonance or after causing current hysteresis, the current inner loop of the present embodiment adopts dead beat (Dead-beat) controller, the algorithm of track with zero error device is the control algolithm based on controlled device mathematical models, there is rapid dynamic response speed, suppress the advantages such as vibration ability is strong, can according to inverter, the state equation of filter and the feedback signal of output, calculate the switching time of next sampling period power device.
Preferably, boost chopper 10 comprises: inductance, and the first end of inductance is as the first input end of boost chopper; Diode, the first end of diode is connected with the second end of inductance, and the second end of diode is the first output of boost chopper; First switching tube, the first end of the first switching tube is connected with the first end of diode; First electric capacity, the first end of the first electric capacity is connected with the second end of diode, as the second input of boost chopper; And second electric capacity, the first end ground connection of the second electric capacity, and be connected with the second end of the first electric capacity, the second end of the second electric capacity is connected with the second end of the first switching tube, as the second output of boost chopper.Preferably, by-pass switch 20 is connected in parallel on the first end of inductance and the second end of diode;
Preferably, translation circuit 30 comprises: second switch pipe, and the first end of second switch pipe is connected with the first end of the first electric capacity, as the first end of translation circuit; 3rd switching tube, the 3rd closes the first end of pipe is connected with the second end of second switch pipe, and the second end of the 3rd switching tube is connected with the second end of the second electric capacity, and as the second end of translation circuit, second switch Guan Yu tri-switching tube is in the same way; 4th switching tube, the first end of the 4th switching tube is connected with the second end of the first electric capacity; And the 5th switching tube, the first end of the 5th switching tube is connected with the second end of the 4th switching tube, and the second end of the 5th switching tube is connected with the second end of second switch pipe, as the 3rd end of translation circuit, the 4th switching tube and the 5th switching tube reverse.
Preferably, this photovoltaic grid-connected converter can also comprise MPPT maximum power point tracking device, is arranged between boost chopper 10 and photovoltaic array, for the peak power output of tracking photovoltaic array.The power output of photovoltaic array is relevant with the operating voltage of MPPT maximum power point tracking device, MPPT maximum power point tracking device can make the peak power output of the power output tracking photovoltaic array of photovoltaic array, the output voltage of photovoltaic array can change, and boost chopper 10 receives the output voltage of the photovoltaic array after MPPT maximum power point tracking device regulates.Alternatively, can compare by voltage hysteresis the output voltage that the photovoltaic array after MPPT maximum power point tracking device regulates stablized by tracker, stablize the input voltage of boost chopper 10.
The photovoltaic grid-connected converter that this embodiment provides, by boost chopper 10, is connected with photovoltaic array, for carrying out boosting inverter to the output voltage of photovoltaic array; By-pass switch 20, in parallel with boost chopper 10, for the bypass Boost chopper 10 when the output voltage of photovoltaic array exceeds predetermined voltage threshold; And translation circuit 30, be connected with the output of boost chopper 10, carry out DC-AC conversion for the electric current exported boost chopper 10, solve the problem that in correlation technique, photovoltaic grid-connected converter conversion efficiency is lower.Photovoltaic grid-connected converter can be selected to be in band boost chopper and two kinds of mode of operations not with boost chopper by by-pass switch, and then improve the conversion efficiency of photovoltaic grid-connected converter.
Fig. 2 is the schematic diagram of the track with zero error block diagram of photovoltaic grid-connected converter according to the embodiment of the present invention.The output voltage u of photovoltaic array (PVArray)
pvwith output current i
pvoutput to MPPT maximum power point tracking device (MPPT), control (MPPT) through maximal power tracing and pulse-width modulation (PWM) is carried out to boost chopper (BOOST) 10, the output voltage of boost chopper 10, after three-level converter (CCT) carries out inversion, outputs to power transmission network Grid.V
g(n), V
g(n-1) be current period and the power transmission network voltage in a upper cycle, I
gn () is photovoltaic grid-connected converter current period output current, V
dcfor DC bus-bar voltage, V
reffor DC reference voltage, V
refwith V
dcafter be input to PI controller, obtain next sampling instant inverter export reference current I*, sinusoidal signal sin (t) obtains the current forecasting value I in next cycle after being multiplied with the reference current I* of next sampling instant
ref(n+1).V
g(n), V
g(n-1), I
g(n), I
refand V (n+1)
dcthrough track with zero error, draw the control signal in next cycle, and then sinusoidal pulse width modulation (SPWM) is carried out to three-level converter.。
Fig. 3 is the schematic diagram of the double-direction control structured flowchart of photovoltaic grid-connected converter according to the embodiment of the present invention.Photovoltaic grid-connected converter adopts the double-closed-loop control structure of outer voltage, current inner loop, V
dc_reffor direct voltage is given, V
pvfor direct voltage, K
sfor DC bus-bar voltage downsampling factor, V
c_limitfor adjuster output violent change, limit the maximum power of photovoltaic grid-connected converter, I
o_reffor inverter side given value of current, i
ofor inverter side electric current, G
us () is voltage regulator, output just can be or be negative, G
cs () is current regulator, G
1(s) and G
2s () is respectively duty ratio d to direct voltage V
pvwith alternating current i
otransfer function.When photovoltaic grid-connected converter is operated in rectification state, outer voltage plays the effect of stable DC busbar voltage; When photovoltaic grid-connected converter is operated in rectification or inverter mode, the alternating current that current inner loop controls power transmission network side follows the tracks of alternating voltage.Based in the micro-capacitance sensor of DC bus, when DC side energy raises, direct voltage V
pvrise, outer voltage adjuster G
us () exports increases, inverter side given value of current I
o_refincrease, the energy on DC bus is incorporated to power transmission network, and converter is operated in inverter mode; When DC side energy shortage, direct voltage V
pvdecline, outer voltage adjuster G
us () exports as negative value, inverter side given value of current I
o_refalso be negative value, power transmission network is by Power supply DC bus, and photovoltaic grid-connected converter is operated in rectification state.Double-direction control structure achieves the way traffic of photovoltaic grid-connected converter, and energy can two-way circulate.
Fig. 4 is the schematic diagram of photovoltaic grid-connected converter according to a second embodiment of the present invention.This embodiment can as the preferred implementation of above-mentioned first embodiment, and as shown in Figure 4, this photovoltaic grid-connected converter comprises: the boost chopper 40 of translation circuit 30 and band bypass.
Boost chopper 40 with bypass is for judging whether the output voltage of photovoltaic array (PV) is greater than predetermined voltage threshold, when the output voltage of photovoltaic array is greater than predetermined voltage threshold, closes bypass switch K1, boost chopper 40 with bypass quits work, when the output voltage of photovoltaic array is not more than predetermined voltage threshold, open by-pass switch K1, the boost chopper 40 of band bypass is started working, and carries out boosting inverter to the output voltage of photovoltaic array.Boost chopper 40 with bypass also comprises inductance L 1, diode D1, switching tube S1, electric capacity C1 and electric capacity C2.Wherein, the first end of inductance L 1 is connected with photovoltaic array output voltage first end, diode D1 anode is connected with the second end of inductance L 1, first end and the diode D1 negative electrode of by-pass switch K1 and inductance L 1 are in parallel, the collector electrode of switching tube S1 is connected to the second end of inductance L 1, the emitter of switching tube S1 is connected to photovoltaic array output voltage second end, electric capacity C1 positive pole is connected with diode D1 negative electrode, electric capacity C2 positive pole is connected with electric capacity C1 negative pole and ground connection, and electric capacity C2 negative pole is connected with the emitter of switching tube S1.Translation circuit 30 is for mutually changing DC-AC electricity.Switching tube Sa collector electrode is connected with electric capacity C1 positive pole, switching tube Sb collector electrode is connected with switching tube Sa emitter, switching tube Sb emitter is connected with electric capacity C2 negative pole, switching tube Sd emitter is connected with electric capacity C1 negative pole, switching tube Sc collector electrode is connected with switching tube Sd collector electrode, and switching tube Sc emitter is connected with inductance L 2 first end, and inductance L 2 second end is connected with electric capacity C3 positive pole, electric capacity C3 negative pole is connected with electric capacity C1 negative pole, power transmission network V
gridin parallel with electric capacity C3.
The photovoltaic grid-connected converter that this embodiment proposes adopts T-shaped three-level topology structure, has simplified isolating transformer, has realized non-isolated.Non-isolation type photovoltaic grid-connected converter structure not containing isolating transformer, the advantage such as have that efficiency is high, volume is little, lightweight and cost is low.Meanwhile, utilize one group of switching tube Sc, Sd to form bidirectional switch, achieve the clamper function to main switch Sa, Sb, compared with traditional two level topological structures, the photovoltaic grid-connected converter that this embodiment proposes has the advantages such as output voltage is many level, and harmonic wave is little, and required filtering inductance is little, be conducive to reducing system cost and loss, switching loss is little, and conversion efficiency is high, compared with traditional three-level topology structure, there is number of devices few, the features such as device loss is even.
Embodiments of the invention additionally provide a kind of photovoltaic power supply system.
Fig. 5 is the schematic diagram of photovoltaic power supply system according to a first embodiment of the present invention.As shown in Figure 5, this photovoltaic power supply system comprises: photovoltaic grid-connected converter 50 and Intelligent Power Module 60.
Photovoltaic grid-connected converter 50 is the photovoltaic grid-connected converter of the embodiment of the present invention.Intelligent Power Module 60, is arranged between photovoltaic grid-connected converter 50 and electrical equipment, is connected in parallel on the first output of boost chopper and the second output of boost chopper, for the direct current of drawing from photovoltaic grid-connected converter 50 is converted to three-phase alternating current.
Preferably, Intelligent Power Module 60 comprises: the first switching tube group, comprises the 6th switching tube and the 7th switching tube of series connection, draws the first-phase node of output current between the 6th switching tube and the 7th switching tube; Second switch pipe group, in parallel with the first switching tube group, comprise the 8th switching tube and the 9th switching tube of series connection, between the 8th switching tube and the 9th switching tube, draw the second-phase node of output current; And the 3rd switching tube group, in parallel with the first switching tube group, comprise the tenth switching tube and the 11 switching tube of series connection, between the tenth switching tube and the 11 switching tube, draw the third phase node of output current.
Preferably, this photovoltaic power supply system also comprises: filter capacitor, and filter capacitor is in parallel with Intelligent Power Module 60.Filter capacitor is used for the supply power voltage of stable power-supplying system.
The photovoltaic power supply system that this embodiment provides is the photovoltaic grid-connected converter 50 of the embodiment of the present invention by photovoltaic grid-connected converter 50.Intelligent Power Module 60, be arranged between photovoltaic grid-connected converter 50 and electrical equipment, be connected in parallel on the first output of boost chopper and the second output of boost chopper, for the direct current of drawing from photovoltaic grid-connected converter 50 is converted to three-phase alternating current, solve the problem that in the photovoltaic power supply system of correlation technique, photovoltaic grid-connected converter 50 conversion efficiency is lower.The conversion efficiency of photovoltaic power supply system is improve by the photovoltaic grid-connected converter 50 of the embodiment of the present invention.
Fig. 6 is the schematic diagram of photovoltaic power supply system according to a second embodiment of the present invention.As shown in Figure 6, this photovoltaic power supply system comprises: the boost chopper 40 of translation circuit 30, band bypass and Intelligent Power Module (IPM) 60.
Translation circuit 30 is identical with the connected mode in the photovoltaic grid-connected converter of second embodiment of the invention with the boost chopper 40 of band bypass, does not repeat them here.Filter capacitor C4 positive pole is connected with electric capacity C1 positive pole, and filter capacitor C4 negative pole is connected with electric capacity C2 negative pole.The circuit connecting mode of Intelligent Power Module 60 is as follows:
Switching tube Sa1 collector electrode is connected with filter capacitor C4 emitter, and switching tube Sa2 collector electrode is connected with switching tube Sa1 emitter, and draws first-phase node.Switching tube Sb1 collector electrode is connected with filter capacitor C4 emitter, and switching tube Sb2 collector electrode is connected with switching tube Sb1 emitter, and draws second-phase node.Switching tube Sc1 collector electrode is connected with filter capacitor C4 emitter, and switching tube Sc2 collector electrode is connected with switching tube Sc1 emitter, and draws third phase node.Power consumption equipment, such as, permagnetic synchronous motor (PMSM), compressor (Compressor), can receive photovoltaic power supply system power supply by connecting first, second and third phase node.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a photovoltaic grid-connected converter, is characterized in that, comprising:
Boost chopper, is connected with photovoltaic array, for carrying out boosting inverter to the output voltage of described photovoltaic array;
By-pass switch, in parallel with described boost chopper, for the boost chopper described in bypass when the output voltage of described photovoltaic array exceeds predetermined voltage threshold; And
Translation circuit, is connected with the output of described boost chopper, carries out DC-AC conversion for the electric current exported described boost chopper.
2. photovoltaic grid-connected converter according to claim 1, is characterized in that, described photovoltaic grid-connected converter also comprises:
Voltage hysteresis compares tracker, is arranged between described boost chopper and described photovoltaic array, for stablizing the input voltage of described boost chopper.
3. photovoltaic grid-connected converter according to claim 2, it is characterized in that, the input of described boost chopper and the input of described by-pass switch are connected to the first circuit node, and described voltage hysteresis compares tracker and is arranged between described first circuit node and described photovoltaic array.
4. photovoltaic grid-connected converter according to claim 1, is characterized in that, described photovoltaic grid-connected converter adopts the double-closed-loop control structure of outer voltage, current inner loop, and described photovoltaic grid-connected converter also comprises:
Track with zero error device, is arranged in described current inner loop.
5. photovoltaic grid-connected converter according to claim 1, is characterized in that, described boost chopper comprises:
Inductance, the first end of described inductance is as the first input end of described boost chopper;
Diode, the first end of described diode is connected with the second end of described inductance, and the second end of described diode is the first output of described boost chopper;
First switching tube, the first end of described first switching tube is connected with the first end of described diode;
First electric capacity, the first end of described first electric capacity is connected with the second end of described diode, as the second input of described boost chopper; And
Second electric capacity, the first end ground connection of described second electric capacity, and be connected with the second end of described first electric capacity, the second end of described second electric capacity is connected with the second end of described first switching tube, as the second output of described boost chopper.
6. photovoltaic grid-connected converter according to claim 5, is characterized in that, described by-pass switch is connected in parallel on the first end of described inductance and the second end of described diode.
7. photovoltaic grid-connected converter according to claim 5, is characterized in that, described translation circuit comprises:
Second switch pipe, the first end of described second switch pipe is connected with the first end of described first electric capacity, as the first end of described translation circuit;
3rd switching tube, the first end of described 3rd switching tube is connected with the second end of described second switch pipe, second end of described 3rd switching tube is connected with the second end of described second electric capacity, and as the second end of described translation circuit, described second switch pipe and described 3rd switching tube are in the same way;
4th switching tube, the first end of described 4th switching tube is connected with the second end of described first electric capacity; And
5th switching tube, the first end of described 5th switching tube is connected with the second end of described 4th switching tube, second end of described 5th switching tube is connected with the second end of described second switch pipe, as the 3rd end of described translation circuit, described 4th switching tube and described 5th switching tube reverse.
8. photovoltaic grid-connected converter according to claim 1, is characterized in that, described photovoltaic grid-connected converter also comprises:
MPPT maximum power point tracking device, is arranged between described boost chopper and described photovoltaic array, for following the tracks of the peak power output of described photovoltaic array.
9. a photovoltaic power supply system, is characterized in that, comprising:
Photovoltaic grid-connected converter according to any one of claim 1 to 8; And
Intelligent Power Module, be arranged between described photovoltaic grid-connected converter and electrical equipment, be connected in parallel on the first output of described boost chopper and the second output of described boost chopper, for the direct current of drawing from described photovoltaic grid-connected converter is converted to three-phase alternating current.
10. photovoltaic power supply system according to claim 9, is characterized in that, described Intelligent Power Module comprises:
First switching tube group, comprises the 6th switching tube and the 7th switching tube of series connection, draws the first-phase node of output current between described 6th switching tube and described 7th switching tube;
Second switch pipe group, in parallel with described first switching tube group, comprise the 8th switching tube and the 9th switching tube of series connection, between described 8th switching tube and described 9th switching tube, draw the second-phase node of output current; And
3rd switching tube group, in parallel with described first switching tube group, comprise the tenth switching tube and the 11 switching tube of series connection, between described tenth switching tube and described 11 switching tube, draw the third phase node of output current.
11. photovoltaic power supply systems according to claim 9, is characterized in that, described photovoltaic power supply system also comprises:
Filter capacitor, described filter capacitor is in parallel with described Intelligent Power Module.
12. 1 kinds of electrical equipment, is characterized in that, comprise the photovoltaic power supply system according to any one of claim 9 to 11.
13. electrical equipment according to claim 12, is characterized in that, described electrical equipment is air-conditioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510925904.XA CN105337520A (en) | 2015-12-11 | 2015-12-11 | Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510925904.XA CN105337520A (en) | 2015-12-11 | 2015-12-11 | Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105337520A true CN105337520A (en) | 2016-02-17 |
Family
ID=55287866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510925904.XA Pending CN105337520A (en) | 2015-12-11 | 2015-12-11 | Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105337520A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208885A (en) * | 2016-06-30 | 2016-12-07 | 广东美芝制冷设备有限公司 | Air-conditioner and the control system of micro-compressor and the control method of pfc circuit |
| CN106953538A (en) * | 2016-11-29 | 2017-07-14 | 湘潭大学 | It is a kind of that the method for improving photovoltaic combining inverter conversion efficiency is bypassed based on relay |
| CN107196506A (en) * | 2017-07-07 | 2017-09-22 | 华南理工大学 | A kind of three-level Boost converter repeats dead beat Compound Control Strategy |
| CN107560039A (en) * | 2017-08-31 | 2018-01-09 | 珠海格力电器股份有限公司 | PV air-conditioner adapter and PV air-conditioner system |
| CN111082686A (en) * | 2020-01-13 | 2020-04-28 | 阳光电源股份有限公司 | Multi-path MPPT inverter and control method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128974A (en) * | 2005-02-25 | 2008-02-20 | 三菱电机株式会社 | Power conversion apparatus |
| CN102522911A (en) * | 2011-11-25 | 2012-06-27 | 华为技术有限公司 | Inverting device and solar PV (Photovoltaic) grid-connected system applying same |
| CN102856916A (en) * | 2012-04-10 | 2013-01-02 | 北京昆兰新能源技术有限公司 | Reactive power control method and circuit of single-phase photovoltaic inverter |
| CN103001511A (en) * | 2011-09-13 | 2013-03-27 | 阳光电源股份有限公司 | Voltage converter and operating method thereof |
| CN203193537U (en) * | 2013-03-17 | 2013-09-11 | 江苏宝丰新能源科技有限公司 | Two-stage three-level three-phase photovoltaic grid-connected inverter |
| CN104158208A (en) * | 2014-07-15 | 2014-11-19 | 阳光电源股份有限公司 | Single-stage photovoltaic grid-connected inverter, as well as control method and application thereof |
| JP5645565B2 (en) * | 2010-09-15 | 2014-12-24 | 三菱電機株式会社 | Power converter and solar power generation system |
| CN104270022A (en) * | 2014-09-30 | 2015-01-07 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN104821601A (en) * | 2015-05-27 | 2015-08-05 | 周皓 | Three-phase photovoltaic grid-connected inverter control device |
| CN205195587U (en) * | 2015-12-11 | 2016-04-27 | 珠海格力电器股份有限公司 | Grid -connected PV converter, photovoltaic power supply system and electrical apparatus |
-
2015
- 2015-12-11 CN CN201510925904.XA patent/CN105337520A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128974A (en) * | 2005-02-25 | 2008-02-20 | 三菱电机株式会社 | Power conversion apparatus |
| JP5645565B2 (en) * | 2010-09-15 | 2014-12-24 | 三菱電機株式会社 | Power converter and solar power generation system |
| CN103001511A (en) * | 2011-09-13 | 2013-03-27 | 阳光电源股份有限公司 | Voltage converter and operating method thereof |
| CN102522911A (en) * | 2011-11-25 | 2012-06-27 | 华为技术有限公司 | Inverting device and solar PV (Photovoltaic) grid-connected system applying same |
| CN102856916A (en) * | 2012-04-10 | 2013-01-02 | 北京昆兰新能源技术有限公司 | Reactive power control method and circuit of single-phase photovoltaic inverter |
| CN203193537U (en) * | 2013-03-17 | 2013-09-11 | 江苏宝丰新能源科技有限公司 | Two-stage three-level three-phase photovoltaic grid-connected inverter |
| CN104158208A (en) * | 2014-07-15 | 2014-11-19 | 阳光电源股份有限公司 | Single-stage photovoltaic grid-connected inverter, as well as control method and application thereof |
| CN104270022A (en) * | 2014-09-30 | 2015-01-07 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN104821601A (en) * | 2015-05-27 | 2015-08-05 | 周皓 | Three-phase photovoltaic grid-connected inverter control device |
| CN205195587U (en) * | 2015-12-11 | 2016-04-27 | 珠海格力电器股份有限公司 | Grid -connected PV converter, photovoltaic power supply system and electrical apparatus |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208885A (en) * | 2016-06-30 | 2016-12-07 | 广东美芝制冷设备有限公司 | Air-conditioner and the control system of micro-compressor and the control method of pfc circuit |
| CN106208885B (en) * | 2016-06-30 | 2019-04-05 | 广东美芝制冷设备有限公司 | The control method of the control system and pfc circuit of air conditioner and micro-compressor |
| CN106953538A (en) * | 2016-11-29 | 2017-07-14 | 湘潭大学 | It is a kind of that the method for improving photovoltaic combining inverter conversion efficiency is bypassed based on relay |
| CN107196506A (en) * | 2017-07-07 | 2017-09-22 | 华南理工大学 | A kind of three-level Boost converter repeats dead beat Compound Control Strategy |
| CN107560039A (en) * | 2017-08-31 | 2018-01-09 | 珠海格力电器股份有限公司 | PV air-conditioner adapter and PV air-conditioner system |
| CN107560039B (en) * | 2017-08-31 | 2023-11-14 | 珠海格力电器股份有限公司 | Photovoltaic air conditioner adapter and photovoltaic air conditioning system |
| CN111082686A (en) * | 2020-01-13 | 2020-04-28 | 阳光电源股份有限公司 | Multi-path MPPT inverter and control method thereof |
| CN111082686B (en) * | 2020-01-13 | 2022-04-08 | 阳光电源股份有限公司 | Multi-path MPPT inverter and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106787707B (en) | Embedded energy storage type multi-module tandem photovoltaic direct current boost converter and application method | |
| CN111064359A (en) | Wide-range bidirectional conversion circuit and control method | |
| CN102856916B (en) | Reactive power control method and circuit of single-phase photovoltaic inverter | |
| CN101345423B (en) | 5-power level H-bridge cascade connection back-to-back current transformer used for wind power generation system | |
| CN205195587U (en) | Grid -connected PV converter, photovoltaic power supply system and electrical apparatus | |
| CN204103797U (en) | The T-shaped inverter of a kind of accurate Z source three level | |
| CN106208737B (en) | Model prediction current control method based on third-harmonic zero-sequence voltage matrix converter | |
| WO2017197629A1 (en) | Current source inverter system and inverter device | |
| CN104467005A (en) | T-type three-level three-phase four-bridge-arm grid-connected photovoltaic power generation system and control method thereof | |
| CN105337520A (en) | Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance | |
| CN103023362A (en) | Bridgeless inverter circuit and solar bridgeless inverter | |
| CN204103796U (en) | Photovoltaic DC-to-AC converter and PV air-conditioner system | |
| CN104638971A (en) | Photovoltaic grid-connected inverter and control method thereof | |
| Palanisamy et al. | Maximum Boost Control for 7-level z-source cascaded h-bridge inverter | |
| Sen et al. | Development, implementation and performance analysis of decoupler based control of dual source DC-DC converter | |
| Kroics et al. | Analysis of advanced inverter topology for renewable energy generation and energy storage integration into AC grid | |
| CN104124884A (en) | Photovoltaic inverter and photovoltaic air conditioner system | |
| CN117353379A (en) | Control method and system for high-order grid-connected converter based on virtual double-machine parallel technology | |
| CN110071652B (en) | Low-leakage-current five-switch non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system | |
| CN104796019A (en) | Z-source three-level PWM (pulse width modulation) rectifier and method for controlling same | |
| Hao et al. | A new interleaved three-level boost converter and neutral-point potential balancing | |
| CN102118035B (en) | Grid-connected inverter | |
| CN111327222A (en) | Current transformation circuit | |
| CN115207937A (en) | Household electric energy router and control method and soft start method thereof | |
| Wu et al. | Aalborg inverter—A new type of “Buck in Buck, Boost in Boost” grid-tied inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160217 |
|
| RJ01 | Rejection of invention patent application after publication |