CN203691279U - Topologically structured circuit of mini photovoltaic inverter - Google Patents
Topologically structured circuit of mini photovoltaic inverter Download PDFInfo
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- CN203691279U CN203691279U CN201320830399.7U CN201320830399U CN203691279U CN 203691279 U CN203691279 U CN 203691279U CN 201320830399 U CN201320830399 U CN 201320830399U CN 203691279 U CN203691279 U CN 203691279U
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- 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
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides a topologically structured circuit of a mini photovoltaic inverter. The topologically structured circuit comprises six NPN power switches, four power diodes, a transformer inductor, an excitation inductor, an intermediate capacitor, a DC bus support capacitor and an output filtering capacitor. The topologically structured circuit is simple and compact in structure, low in switching frequency, suitable for a single-phase inverter, wide in input voltage scope of a battery plate, and low in inversion output harmonic wave.
Description
Technical field
The utility model is specifically related to a kind of miniature photovoltaic inverter topology circuit.
Background technology
After striding into 21 century, the whole world is facing energy crisis, and new forms of energy have become in development of world economy tool and determined one of five large technical fields of power.Solar photovoltaic technology has obtained lasting development as important a member of new forms of energy.Solar photovoltaic generation system can be divided into two large classes: the one, and autonomous system, the 2nd, grid-connected system.Autonomous system is directly to provide power to load by solar cell, is used for, to remote areas without electricity power supply, being vulnerable to the impact such as time and season.
Photovoltaic DC-to-AC converter is as parts important in photovoltaic system, and its research is also more and more subject to people's attention.Study hotspot mainly concentrates on the research of research, control method and the research of new inversion transformation technique of new topological structure.In the research of topological structure, a lot of inverter topologies are suggested, and various topological structure is applied to respectively in different inverter technologies.In recent years, AC module inverter is developed rapidly, has the features such as flexibility is high, adaptation production in enormous quantities because of it, has occurred that a large amount of inverter topologies is applied in AC module.
Parallel network power generation has become the principal mode that solar energy utilizes.The feature of grid-connected system is to pass through control inverter, the direct current directly solar battery array being sent is converted to alternating current, as the inverter that carries out energy conversion between photovoltaic array and network system, the factors such as its fail safe, reliability, inversion efficiency, manufacturing cost have very important status to entirety investment and the income of electricity generation system.
At present, the research of photovoltaic DC-to-AC converter topology is all towards compacter design, wider input and output voltage scope, more high efficiency future development.Traditional voltage source inverter is mostly based on Buck type circuit topology, can only produce the output AC voltage that amplitude is forced down than input dc power.And often with the heavy Industrial Frequency Transformer of bulky, therefore there is the shortcomings such as volume is large, noise is large, and inversion efficiency is not high.It is foundation structure that the utility model utilizes high power decoupling zero isolated form inverse-excitation type inverter topology, has proposed a kind of topological structure of novel photovoltaic DC-to-AC converter.This inverter structure compactness, is applicable to AC module, and is operated under the discontinuous mode of resonant inductance electric current, therefore can realize the zero current turning-on of all switches and the zero-current switching of auxiliary switch, greatly reduces switching loss, has improved system effectiveness.
Summary of the invention
For making up the weak point of above technology, the utility model discloses a kind of miniature photovoltaic inverter topology circuit taking Buck-Boost and half-bridge inversion circuit as basis.
The utility model is achieved in that
A kind of miniature photovoltaic inverter topology circuit, comprise six NPN type power switchs, four power diodes, transformer inductance, magnetizing inductance, intermediate capacitance, DC bus Support Capacitor and output filter capacitor, one end of PV array connects respectively the emitter of the first power switch and the negative pole of DC bus Support Capacitor, the other end of PV array connects respectively the collector electrode of the 4th power switch and the positive pole of DC bus Support Capacitor, the collector electrode of the first power switch connects respectively the emitter of the second power switch, the negative pole of the second power diode and one end of transformer primary, the emitter of the 4th power switch connects respectively the positive pole of the first power diode, the 3rd collector electrode of power switch and the other end of transformer primary, the negative pole of the first power diode connects respectively the collector electrode of the second power switch and the positive pole of intermediate capacitance, the negative pole of intermediate capacitance connects respectively the positive pole of the second power diode and the emitter of the 3rd power switch, the one end on transformer secondary top connects the positive pole of the 3rd power diode, the other end on transformer secondary top connects respectively one end of electrical network and one end of transformer secondary bottom, the other end of the bottom of transformer secondary connects the negative pole of the 4th power diode, the negative pole of the 3rd power diode connects the collector electrode of the 5th power switch, the emitter of the 5th power switch connects respectively the collector electrode of the 6th power switch, one end of output filter capacitor and one end of magnetizing inductance, the other end of magnetizing inductance connects the other end of electrical network, the other end of output filter capacitor connects one end of electrical network, the emitter of the 6th power switch connects the positive pole of the 4th power diode.
The beneficial effects of the utility model:
The utlity model has simple and compact for structurely, switching frequency is low, is applicable to single-phase inverter, battery pole plates wide input voltage range, the feature such as inversion output harmonic wave is little.
Brief description of the drawings
Fig. 1 is single-stage series resonance Buck-Boost inverter circuit topological structure circuit.
Embodiment
embodiment 1
A kind of miniature photovoltaic inverter topology circuit, comprise six NPN type power switch V1, V2, V3, V4, V5, V6, four power diode D1, D2, D3, D4, transformer inductance L1, L2, magnetizing inductance Ls, intermediate capacitance Cd, DC bus Support Capacitor Cpv and output filter capacitor Cs, one end of PV array connects respectively the emitter of the first power switch V1 and the negative pole of DC bus Support Capacitor Cpv, the other end of PV array connects respectively the collector electrode of the 4th power switch V4 and the positive pole of DC bus Support Capacitor Cpv, the collector electrode of the first power switch V1 connects respectively the emitter of the second power switch V2, the second negative pole of power diode D2 and one end of transformer primary, the emitter of the 4th power switch V4 connects respectively the positive pole of the first power diode D1, the 3rd collector electrode of power switch V3 and the other end of transformer primary, the negative pole of the first power diode D1 connects respectively the collector electrode of the second power switch V2 and the positive pole of intermediate capacitance Cd, the negative pole of intermediate capacitance Cd connects respectively the positive pole of the second power diode D2 and the emitter of the 3rd power switch V3, one end of transformer secondary top L1 connects the positive pole of the 3rd power diode D3, the other end of transformer secondary top L1 connects respectively one end of electrical network and one end of transformer secondary bottom L2, the other end of transformer secondary bottom L2 connects the negative pole of the 4th power diode D4, the negative pole of the 3rd power diode D3 connects the collector electrode of the 5th power switch V5, the emitter of the 5th power switch V5 connects respectively the collector electrode of the 6th power switch V6, one end of one end of output filter capacitor Cs and magnetizing inductance Ls, the other end of magnetizing inductance Ls connects the other end of electrical network, the other end of output filter capacitor Cs connects one end of electrical network, the emitter of the 6th power switch V6 connects the positive pole of the 4th power diode D4.
embodiment 2
This topology rises chopper circuit by prime Buck-Boost and rear class half-bridge inversion circuit forms.Front stage converter realizes the voltage transformation to photovoltaic array, and realizes MPPT function: in the time of V1 and V4 conducting, PV array passes through V1, V4, D1 and D2 to capacitor C d transferring energy; When V1, V4 turn-off, when V2 and V3 conducting, the energy in Cd passes to flyback transformer and is stored in magnetizing inductance; In the time of V2 and V3 shutoff, the energy in magnetizing inductance is passed to the secondary of transformer.When electrical network is during at positive half cycle, switching tube V5 normal open, winding L 1 by V5, D3 and Ls to electrical network feedback energy; When electrical network is during at negative half period, switching tube V6 normal open, winding L 2 by V6, D4 and Ls to electrical network feedback energy.Intermediate capacitance Cd is used as the buffer of energy, and its both end voltage is made up of the alternating voltage of DC component and twice load frequency.This topological structure is to have replaced electrochemical capacitor by intermediate capacitance, and the bulk life time of inverter is extended greatly.
Claims (1)
1. a miniature photovoltaic inverter topology circuit, comprise six NPN type power switchs, four power diodes, transformer inductance, magnetizing inductance, intermediate capacitance, DC bus Support Capacitor and output filter capacitor, it is characterized in that: one end of PV array connects respectively the emitter of the first power switch and the negative pole of DC bus Support Capacitor, the other end of PV array connects respectively the collector electrode of the 4th power switch and the positive pole of DC bus Support Capacitor, the collector electrode of the first power switch connects respectively the emitter of the second power switch, the negative pole of the second power diode and one end of transformer primary, the emitter of the 4th power switch connects respectively the positive pole of the first power diode, the 3rd collector electrode of power switch and the other end of transformer primary, the negative pole of the first power diode connects respectively the collector electrode of the second power switch and the positive pole of intermediate capacitance, the negative pole of intermediate capacitance connects respectively the positive pole of the second power diode and the emitter of the 3rd power switch, the one end on transformer secondary top connects the positive pole of the 3rd power diode, the other end on transformer secondary top connects respectively one end of electrical network and one end of transformer secondary bottom, the other end of the bottom of transformer secondary connects the negative pole of the 4th power diode, the negative pole of the 3rd power diode connects the collector electrode of the 5th power switch, the emitter of the 5th power switch connects respectively the collector electrode of the 6th power switch, one end of output filter capacitor and one end of magnetizing inductance, the other end of magnetizing inductance connects the other end of electrical network, the other end of output filter capacitor connects one end of electrical network, the emitter of the 6th power switch connects the positive pole of the 4th power diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320830399.7U CN203691279U (en) | 2013-12-17 | 2013-12-17 | Topologically structured circuit of mini photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320830399.7U CN203691279U (en) | 2013-12-17 | 2013-12-17 | Topologically structured circuit of mini photovoltaic inverter |
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| CN203691279U true CN203691279U (en) | 2014-07-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350816A (en) * | 2019-07-16 | 2019-10-18 | 福州大学 | A kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit |
| CN112019080A (en) * | 2020-08-25 | 2020-12-01 | 福州大学 | A single-phase current-mode inverter with LC active boost buffer network |
| CN112398360A (en) * | 2020-11-10 | 2021-02-23 | 国网上海市电力公司 | A single-phase three-level micro photovoltaic inverter and its open-loop control method and system |
-
2013
- 2013-12-17 CN CN201320830399.7U patent/CN203691279U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350816A (en) * | 2019-07-16 | 2019-10-18 | 福州大学 | A kind of single-stage and-phase current source inverter of energy storage inductor parallel connection Active Snubber Circuit |
| CN110350816B (en) * | 2019-07-16 | 2020-10-09 | 福州大学 | A single-stage single-phase current-mode inverter with an energy storage inductor paralleled with an active snubber circuit |
| CN112019080A (en) * | 2020-08-25 | 2020-12-01 | 福州大学 | A single-phase current-mode inverter with LC active boost buffer network |
| CN112019080B (en) * | 2020-08-25 | 2021-12-28 | 福州大学 | A single-phase current-mode inverter with LC active boost buffer network |
| CN112398360A (en) * | 2020-11-10 | 2021-02-23 | 国网上海市电力公司 | A single-phase three-level micro photovoltaic inverter and its open-loop control method and system |
| CN112398360B (en) * | 2020-11-10 | 2023-04-11 | 国网上海市电力公司 | Single-phase three-level micro photovoltaic inverter and open-loop control method and system thereof |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20191217 |