CN202713179U - Double-transformer series resonance type miniature photovoltaic inverter - Google Patents

Double-transformer series resonance type miniature photovoltaic inverter Download PDF

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Publication number
CN202713179U
CN202713179U CN 201220127727 CN201220127727U CN202713179U CN 202713179 U CN202713179 U CN 202713179U CN 201220127727 CN201220127727 CN 201220127727 CN 201220127727 U CN201220127727 U CN 201220127727U CN 202713179 U CN202713179 U CN 202713179U
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CN
China
Prior art keywords
circuit
photovoltaic
assembly
double
power
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Expired - Fee Related
Application number
CN 201220127727
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Chinese (zh)
Inventor
王善亮
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DEXIN TAIHE (BEIJING) TECHNOLOGY Co Ltd
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DEXIN TAIHE (BEIJING) TECHNOLOGY Co Ltd
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Priority to CN 201220127727 priority Critical patent/CN202713179U/en
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Publication of CN202713179U publication Critical patent/CN202713179U/en
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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
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The utility model relates to a solar energy grid-connected inverter, in particular to a double-transformer series resonance type miniature photovoltaic inverter, which optimizes the output of a single photovoltaic assembly at a maximum power point and realizes photovoltaic grid connection and power generation with a maximum power, based on an independent solar energy battery assembly. The double-transformer series resonance type miniature photovoltaic inverter can resolve the problems that the traditional photovoltaic power generation system connected in series or in parallel based on a photovoltaic assembly is under the conditions of being nonuniform in sun light irradiation or battery assembly characteristic, and the output power of a whole assembly string is greatly reduced due to the decrease of the output power of a single assembly. The miniature photovoltaic inverter comprises a solar energy battery interface (1), a DC side voltage current detection circuit (2), a double transformer push-pull circuit (3), a PWM generation circuit (4), a single-chip microcomputer (5), a full bridge inverter circuit (6), a digital signal processor (9), a driving circuit (8), and a filtering and AC side voltage current detection circuit (7), wherein the single-chip microcomputer (5) is used for realizing the tracking control of a maximum power point, and the digital signal processor (9) is used for realizing the frequency synchronism and phase synchronism tracking with the power grid.

Description

The miniature photovoltaic DC-to-AC converter of dual transformer serial-resonant
Technical field
The utility model relates to electronic power inversion technology, solar grid-connected generation technology, is a kind of combining inverter based on the independent photovoltaic assembly, belongs to the parallel network power generation technical field.
Background technology
Traditional photovoltaic generating system based on the photovoltaic module series and parallel, be widely used in the large-sized photovoltaic power station, but in building integrated photovoltaic system, because the restriction of usable floor area, traditional photovoltaic generating system structure lacks flexibility and the extendibility of system, and if the module that descends because of the unequal power output that causes of sunshine inequality and characteristic arranged, whole power output will significantly reduce, if arbitrary assembly damages, also can affect the normal operation of whole system, even paralysis.In addition, also there is the problem of fail safe and insulating properties in this system that higher DC power supply arranged.For the problem of conventional photovoltaic electricity generation system, research is found each solar module is equipped with a kind of miniature photovoltaic DC-to-AC converter, can with the output optimization of each photovoltaic module at maximum power point, improve the entire system power output.Whole assembly array is also connected by the 220V AC line, without DC link, has increased Security of the system.
Summary of the invention
Main purpose of the present utility model is to provide a kind of simple installation, the miniature photovoltaic DC-to-AC converter of small-power that conversion efficiency is high.The miniature photovoltaic DC-to-AC converter of dual transformer serial-resonant described in the utility model comprises solar cell interface (1), dc voltage current detection circuit (2), dual transformer push-pull circuit (3), PWM generative circuit (4), single-chip microcomputer (5), full bridge inverter (6), digital signal processor (9), drive circuit (8), filtering and ac-side current voltage detecting circuit (7).
The technical scheme that its technical problem that solves the utility model adopts is: the miniature photovoltaic DC-to-AC converter of dual transformer serial-resonant adopts two transformer secondary output series connection, to realize the series resonance soft switch technique.Detect solar panel side direct voltage by two optocouplers, the resistance detection method detects electric current, use the Sine Wave Pulse Width Modulation inversion transformation technique to realize inversion, by Hall element detection of grid side current/voltage, realize solar grid-connected generating, consist of the miniature photovoltaic DC-to-AC converter of dual transformer serial-resonant.Dual transformer series resonance booster circuit comprises that 4 switch mosfet pipes (15,16,17,18), two transformers (19,20), output rectifier (21,22,23,24), series resonant circuit (25,26) consist of, the secondary coil of two transformers is serially connected, four switching tubes are worked under high-frequency switching signal, and two is one group of alternate conduction.Than under the condition, reduce half than the turn ratio of the push-pull circuit transformer of single transformer in identical input and output, better solved the primary and secondary coupled problem, reduced loss, Effective Raise efficient.Solar module accesses miniature photovoltaic DC-to-AC converter by solar cell interface (1), single-chip microcomputer (5) gathers two optocoupler testing circuits (12) by AD and detects solar module output voltage and divider resistance (10,11) current detecting unit (13) detects the solar energy output current, switch mosfet pipe (15 in applied solar energy MPPT maximum power point tracking algorithm control PWM generative circuit (4) the output pwm signal control dual transformer push-pull circuit (3), 16,17,18) conducting and shutoff, output voltage is through over commutation, send into rear class full bridge inverter (6) after the filtering.Digital signal processor (9) detects the voltage of be incorporated into the power networks terminal voltage testing circuit (36) and current detection circuit (35), use sinusoidal pulse width modulation technology output SPWM modulating wave, and control MOSFET (28,29,30,31) by drive circuit (8) and open and turn-off, output waveform is carried out High frequency filter through filter inductance (33) and filter capacitor (34), obtain and the sine wave of line voltage with the frequency homophase, thereby realize solar grid-connected generating.
The beneficial effects of the utility model be in: realize MPPT maximum power point tracking based on the independent solar battery component, solved in the parallel connection of conventional solar cell component string because of the descend decline of the whole power output that causes of single component power; The structure of boosting that adopts the dual transformer series connection to recommend reduces the single transformer turn ratio, has better solved the primary and secondary coupled problem, has reduced loss, Effective Raise efficient so that miniature photovoltaic DC-to-AC converter conversion efficiency improves.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified
Fig. 1 is miniature photovoltaic DC-to-AC converter composition diagram.
Fig. 2 is miniature photovoltaic inverter technology scheme schematic diagram.
Accompanying drawing 1: solar cell interface (1), dc voltage current detection circuit (2), dual transformer push-pull circuit (3), PWM generative circuit (4), single-chip microcomputer (5), full bridge inverter (6), filtering and ac-side current voltage detecting circuit (7), drive circuit (8), digital signal processor (9).
Accompanying drawing 2: solar module output current voltage detecting circuit (14) comprises two optocoupler testing circuits (12), divider resistance (10,11), current detecting unit (13), the dual transformer series connection is recommended booster circuit (27) and is comprised switch mosfet pipe (15,16,17,18), transformer (19,20), output rectifier (21,22,23,24), series resonant circuit (25,26), full bridge inversion circuit (32) comprises MOSFET (28,29,30,31), output filtering and ac-side current voltage detecting circuit (37) thereof comprise filter inductance (33), filter capacitor (34), the terminal voltage that is incorporated into the power networks testing circuit (36), current transformer detecting unit (35), single-chip microcomputer (5), PWM generative circuit (4), drive circuit (8), digital signal processor (9).
Embodiment
In accompanying drawing 2, the solar cell both positive and negative polarity is connected to solar energy output current voltage detecting circuit (14) by binding post respectively, power circuit portion is connected to the dual transformer series connection and recommends booster circuit (27), solar energy output current voltage adopts circuit (10,11,13) to be connected to single-chip microcomputer (5) through two optocoupler testing circuits (12) and electric current, and single-chip microcomputer (5) is realized boosting by the grid that control PWM generative circuit (4) generates PWM control switch mosfet pipe (15,16,17,18).Output current detects by current transformer (35) after the inversion filtering, output voltage is connected to digital signal processor (9) by the terminal voltage testing circuit (36) that is incorporated into the power networks, digital signal processor (9) sine wave output pulse-width modulation waveform SPWM realizes exchanging output by the grid of MOSFET (28,29,30,31) in drive circuit (8) the control full bridge inversion circuit (32), realizes generating electricity by way of merging two or more grid systems by inductance in the filter circuit (33), electric capacity (34) output industrial frequency AC.

Claims (1)

1. miniature photovoltaic DC-to-AC converter of dual transformer serial-resonant, comprise solar cell interface (1), dc voltage current detection circuit (2), dual transformer push-pull circuit (3), PWM generative circuit (4), single-chip microcomputer (5), full bridge inverter (6), digital signal processor (9), drive circuit (8), filtering and ac-side current voltage detecting circuit (7), it is characterized in that the series resonance booster circuit comprises 4 switch mosfet pipes (15,16,17,18), two transformers (19,20), output rectifier (21,22,23,24), series resonant circuit (25,26), the secondary coil of two transformers is serially connected, four switching tubes are worked under high-frequency switching signal, and two is one group of alternate conduction.
CN 201220127727 2012-03-30 2012-03-30 Double-transformer series resonance type miniature photovoltaic inverter Expired - Fee Related CN202713179U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220127727 CN202713179U (en) 2012-03-30 2012-03-30 Double-transformer series resonance type miniature photovoltaic inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220127727 CN202713179U (en) 2012-03-30 2012-03-30 Double-transformer series resonance type miniature photovoltaic inverter

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CN202713179U true CN202713179U (en) 2013-01-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103208937A (en) * 2013-03-19 2013-07-17 广东工业大学 Single-phase photovoltaic grid-connected inverter
CN103822965A (en) * 2013-12-09 2014-05-28 济宁鲁科检测器材有限公司 Crossed rotating magnetic field flaw detector
CN109768726A (en) * 2017-11-06 2019-05-17 哈尔滨工业大学(威海) It is a kind of can under illumination bad condition efficiency operation solar inverter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103208937A (en) * 2013-03-19 2013-07-17 广东工业大学 Single-phase photovoltaic grid-connected inverter
CN103822965A (en) * 2013-12-09 2014-05-28 济宁鲁科检测器材有限公司 Crossed rotating magnetic field flaw detector
CN109768726A (en) * 2017-11-06 2019-05-17 哈尔滨工业大学(威海) It is a kind of can under illumination bad condition efficiency operation solar inverter

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Granted publication date: 20130130

Termination date: 20180330