CN103633865A - Large-power photovoltaic gird-connected inverter - Google Patents

Large-power photovoltaic gird-connected inverter Download PDF

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Publication number
CN103633865A
CN103633865A CN201310608479.2A CN201310608479A CN103633865A CN 103633865 A CN103633865 A CN 103633865A CN 201310608479 A CN201310608479 A CN 201310608479A CN 103633865 A CN103633865 A CN 103633865A
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China
Prior art keywords
described
effect transistor
field effect
connected
inverter
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CN201310608479.2A
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Chinese (zh)
Inventor
汤翁义
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苏州高创特新能源工程有限公司
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Priority to CN201310608479.2A priority Critical patent/CN103633865A/en
Publication of CN103633865A publication Critical patent/CN103633865A/en

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Abstract

The invention discloses a large-power photovoltaic gird-connected inverter. The inverter comprises a direct current filter circuit, a boosting circuit and a full-bridge inversion circuit which are electrically connected in sequence; direct current is input to the input end of the direct current filter circuit; a second capacitor is connected between the boosting circuit and the full-bridge inversion circuit in parallel; the inverter further comprises a breaker and a protective function circuit; the output end of the breaker is connected with an alternating current power grid. By the mode, the inverter enables the solar radiation energy received by a photovoltaic assembly to become high-voltage direct current after high-frequency direct current conversion, sine alternating current with the frequency and phase same as those of the power grid voltage is outputted after the inverting conversion of the inverter and the work efficiency is higher.

Description

A kind of high-power photovoltaic synchronization inverter

Technical field

The present invention relates to a kind of high-power photovoltaic synchronization inverter.

Background technology

Along with the development of Application of Solar Energy technology, the mainstream development trend of photovoltaic generating system will be grid-connected photovoltaic power generation undoubtedly.And as the combining inverter of one of grid-connected photovoltaic system key device, its runnability directly affects safe, the reliable and high-efficiency operation of grid-connected photovoltaic system.

Since last year, China domestic market progressively starts, and government strengthens support on policy dynamics, and domestic photovoltaic combining inverter demand is soaring in a large number.There is Hefei sunlight, megavolt Chinese mugwort rope in the manufacturer that current domestic inverter has large scale of production, without Xishan hundred million, the auspicious watt of lattice, positive safe power supply, hat Asia power supply, Anhui Yi He, section promise great achievement etc.

From technical elements, China's photovoltaic DC-to-AC converter terminal market is more late start-up time, domestic enterprise still has gap at the aspects such as conversion efficiency, structural manufacturing process, stability and Foreign Advanced Lerel, at present China's small-power inverter technology with abroad substantially in same level, but on high-power combining inverter, still need further to improve and development.

Domestic high-power combining inverter is in efficiency, stability, and integrated level aspect also has gap compared with world level, for these reasons, is necessary oneself research and development high-power photovoltaic synchronization inverter.On the one hand can improve enterprise competitiveness at cost efficiency in own project of building from now on, also can, by the sale of inverter, increase enterprise's main business income in addition on the other hand.

According to national policy planning, photovoltaic plant installation will have 10GW left and right every year from now on, and therefore, the high-power photovoltaic synchronization inverter with competitive advantage will have very wide prospect.

Summary of the invention

The technical problem that the present invention mainly solves is to provide a kind of high-power photovoltaic synchronization inverter, by photovoltaic module, by receiving the solar radiation energy coming, after high-frequency direct-current conversion, become high voltage direct current, through inverter, backward electrical network output and the simple sinusoidal alternating current of line voltage with frequency, homophase are changed in inversion, and operating efficiency is higher.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of high-power photovoltaic synchronization inverter is provided, comprise the DC filtering circuit, booster circuit and the full bridge inverter that are electrically connected successively, the input input dc power of described DC filtering circuit, between described DC filtering circuit and described booster circuit, be connected in parallel to the first electric capacity, between described booster circuit and described full bridge inverter, be connected in parallel to the second electric capacity, described inverter further comprises circuit breaker, and the output of described circuit breaker is connected with AC network.

In a preferred embodiment of the present invention, described booster circuit comprises the 3rd inductance, triode and the first diode, between the second end of described the 3rd inductance, the collector electrode of described triode T and the anode of described the first diode, is electrically connected.

In a preferred embodiment of the present invention, described DC filtering circuit comprises the first filter inductance, the second filter inductance and the first electric capacity, described the first filter inductance is connected between direct current cathode output end and the first end of described the 3rd inductance, described the second filter inductance is connected between direct current cathode output end and the emitter of described triode T, and described the first electric capacity is connected between the first end of described the 3rd inductance and the emitter of described triode T

In a preferred embodiment of the present invention, described full bridge inverter comprises first to fourth VMOS field effect transistor, the drain electrode of the source electrode of a described VMOS field effect transistor and the 2nd VMOS field effect transistor is electrically connected, and the drain electrode of the source electrode of described the 3rd VMOS field effect transistor and the 4th VMOS field effect transistor is electrically connected.

In a preferred embodiment of the present invention, the drain electrode of the drain electrode of a described VMOS field effect transistor and described the 3rd VMOS field effect transistor is electrically connected, and the source electrode of the source electrode of described the 2nd VMOS field effect transistor and described the 4th VMOS field effect transistor is electrically connected.

In a preferred embodiment of the present invention, between a described source electrode for VMOS field effect transistor and the first input end of described circuit breaker, be connected with the 4th inductance, between the second input of the source electrode of described the 3rd VMOS field effect transistor and described circuit breaker, be connected with the 5th inductance.

In a preferred embodiment of the present invention, described inverter further comprises communication interface and human-computer interaction device.

In a preferred embodiment of the present invention, described human-computer interaction device comprises LCD display floater.

The invention has the beneficial effects as follows: the present invention becomes receive the solar radiation energy coming into high voltage direct current by photovoltaic module after high-frequency direct-current conversion, through inverter, backward electrical network output and the simple sinusoidal alternating current of line voltage with frequency, homophase are changed in inversion, and operating efficiency is higher.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also according to these accompanying drawings, obtain other accompanying drawing, wherein:

Fig. 1 is the structural representation of a preferred embodiment of the present invention.

In accompanying drawing, the mark of each parts is as follows: 1, DC filtering circuit; 2, booster circuit; 3, full bridge inverter; 4, circuit breaker; G1, a VMOS field effect transistor; G2, the 2nd VMOS field effect transistor; G3, the 3rd VMOS field effect transistor; G4, the 4th VMOS field effect transistor; C1, the first electric capacity; C2, the second electric capacity; L1, the first filter inductance; L2, the second filter inductance; L3, the 3rd inductance; L4, the 4th inductance; L5, the 5th inductance; D, the first diode; T, triode.

Embodiment

Below the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making all other embodiment that obtain under creative work prerequisite, belong to the scope of protection of the invention.

Refer to Fig. 1, the embodiment of the present invention comprises:

A kind of high-power photovoltaic synchronization inverter, comprise the DC filtering circuit 1, booster circuit 2 and the full bridge inverter 3 that are electrically connected successively, the input input dc power of described DC filtering circuit 1, between described DC filtering circuit 1 and described booster circuit 2, be connected in parallel to the first capacitor C 1, between described booster circuit 2 and described full bridge inverter 3, be connected in parallel to the second capacitor C 2, described inverter further comprises circuit breaker 4, and the output of described circuit breaker 4 is connected with AC network.

Wherein, described booster circuit 2 comprises the 3rd inductance L 3, triode T and the first diode D, between the second end of described the 3rd inductance L 3, the collector electrode of described triode T and the anode of described the first diode D, is electrically connected.

Described DC filtering circuit 1 comprises the first filter inductance L1, the second filter inductance L2 and the first capacitor C 1, described the first filter inductance L1 is connected between direct current cathode output end and the first end of described the 3rd inductance L 3, described the second filter inductance L2 is connected between direct current cathode output end and the emitter of described triode T, and described the first capacitor C 1 is connected between the first end of described the 3rd inductance L 3 and the emitter of described triode T.

In the present invention, described full bridge inverter 3 comprises first to fourth VMOS field effect transistor G4, the drain electrode of the source electrode of a described VMOS field effect transistor G1 and the 2nd VMOS field effect transistor G2 is electrically connected, and the drain electrode of the source electrode of described the 3rd VMOS field effect transistor G3 and the 4th VMOS field effect transistor G4 is electrically connected.The drain electrode of the drain electrode of a described VMOS field effect transistor G1 and described the 3rd VMOS field effect transistor G3 is electrically connected, and the source electrode of the source electrode of described the 2nd VMOS field effect transistor G2 and described the 4th VMOS field effect transistor G4 is electrically connected.Between a described source electrode of VMOS field effect transistor G1 and the first input end of described circuit breaker 4, be connected with the 4th inductance L 4, between described the 3rd source electrode of VMOS field effect transistor G3 and the second input of described circuit breaker 4, be connected with the 5th inductance L 5.

Described inverter further comprises communication interface and human-computer interaction device.Described human-computer interaction device comprises LCD display floater.

The present invention becomes receive the solar radiation energy coming into high voltage direct current by photovoltaic module after high-frequency direct-current is changed, and through inverter, backward electrical network output and the simple sinusoidal alternating current of line voltage with frequency, homophase are changed in inversion, and operating efficiency is higher.

The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.

Claims (8)

1. a high-power photovoltaic synchronization inverter, it is characterized in that, comprise the DC filtering circuit (1), booster circuit (2) and the full bridge inverter (3) that are electrically connected successively, the input input dc power of described DC filtering circuit, between described booster circuit and described full bridge inverter, be connected in parallel to the second electric capacity (C2), described inverter further comprises circuit breaker (4), and the output of described circuit breaker is connected with AC network.
2. high-power photovoltaic synchronization inverter according to claim 1, it is characterized in that, described booster circuit comprises the 3rd inductance (L3), triode (T) and the first diode (D), between the second end of described the 3rd inductance, the collector electrode of described triode T and the anode of described the first diode, is electrically connected.
3. high-power photovoltaic synchronization inverter according to claim 2, it is characterized in that, described DC filtering circuit comprises the first filter inductance (L1), the second filter inductance (L2) and the first electric capacity (C1), described the first filter inductance is connected between direct current cathode output end and the first end of described the 3rd inductance, described the second filter inductance is connected between direct current cathode output end and the emitter of described triode T, and described the first electric capacity is connected between the first end of described the 3rd inductance and the emitter of described triode T.
4. high-power photovoltaic synchronization inverter according to claim 1, it is characterized in that, described full bridge inverter comprises first to fourth VMOS field effect transistor, the drain electrode of the source electrode of a described VMOS field effect transistor (G1) and the 2nd VMOS field effect transistor (G2) is electrically connected, and the drain electrode of the source electrode of described the 3rd VMOS field effect transistor (G3) and the 4th VMOS field effect transistor (G4) is electrically connected.
5. high-power photovoltaic synchronization inverter according to claim 4, it is characterized in that, the drain electrode of the drain electrode of a described VMOS field effect transistor and described the 3rd VMOS field effect transistor is electrically connected, and the source electrode of the source electrode of described the 2nd VMOS field effect transistor and described the 4th VMOS field effect transistor is electrically connected.
6. high-power photovoltaic synchronization inverter according to claim 4, it is characterized in that, between a described source electrode for VMOS field effect transistor and the first input end of described circuit breaker, be connected with the 4th inductance (L4), between the second input of the source electrode of described the 3rd VMOS field effect transistor and described circuit breaker, be connected with the 5th inductance (L5).
7. high-power photovoltaic synchronization inverter according to claim 1, is characterized in that, described inverter further comprises communication interface and human-computer interaction device.
8. high-power photovoltaic synchronization inverter according to claim 7, is characterized in that, described human-computer interaction device comprises LCD display floater.
CN201310608479.2A 2013-11-27 2013-11-27 Large-power photovoltaic gird-connected inverter CN103633865A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108134523A (en) * 2016-11-30 2018-06-08 镇江常畅光伏电子有限公司 A kind of photovoltaic combining inverter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1395348A (en) * 2001-06-29 2003-02-05 三洋电机株式会社 System connection power generator and control method thereof
CN102214929A (en) * 2010-04-12 2011-10-12 富士电机株式会社 Grid-connected inverter
CN202564966U (en) * 2012-03-31 2012-11-28 上海市电力公司 Photovoltaic system
CN202841003U (en) * 2012-08-31 2013-03-27 广东明阳龙源电力电子有限公司 Novel three-phase photovoltaic grid-connected inverter system structure
JP2013150431A (en) * 2012-01-18 2013-08-01 Mitsubishi Electric Corp Power conversion device
CN203645569U (en) * 2013-11-27 2014-06-11 苏州高创特新能源工程有限公司 Large-power photovoltaic grid connected inverter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1395348A (en) * 2001-06-29 2003-02-05 三洋电机株式会社 System connection power generator and control method thereof
CN102214929A (en) * 2010-04-12 2011-10-12 富士电机株式会社 Grid-connected inverter
JP2013150431A (en) * 2012-01-18 2013-08-01 Mitsubishi Electric Corp Power conversion device
CN202564966U (en) * 2012-03-31 2012-11-28 上海市电力公司 Photovoltaic system
CN202841003U (en) * 2012-08-31 2013-03-27 广东明阳龙源电力电子有限公司 Novel three-phase photovoltaic grid-connected inverter system structure
CN203645569U (en) * 2013-11-27 2014-06-11 苏州高创特新能源工程有限公司 Large-power photovoltaic grid connected inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108134523A (en) * 2016-11-30 2018-06-08 镇江常畅光伏电子有限公司 A kind of photovoltaic combining inverter

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