CN202535091U - Photovoltaic micro grid-connected inverter - Google Patents
Photovoltaic micro grid-connected inverter Download PDFInfo
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- CN202535091U CN202535091U CN2012202311800U CN201220231180U CN202535091U CN 202535091 U CN202535091 U CN 202535091U CN 2012202311800 U CN2012202311800 U CN 2012202311800U CN 201220231180 U CN201220231180 U CN 201220231180U CN 202535091 U CN202535091 U CN 202535091U
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- inverter
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- photovoltaic
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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
- 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 utility model relates to a photovoltaic micro grid-connected inverter which comprises a boosted circuit, a direct current filter connected between the direct current input end and the booster circuit and an inversion circuit connected at the output end of the booster circuit. The inverter is characterized in that the output end of the inversion circuit is connected with an alternating current electro magnetic compatibility (EMC) filter through a relay circuit. The inversion circuit is a full bridge inversion circuit, and the control end of a power switch device adopted by the inversion circuit is connected with a control unit and receives low frequency sine pulse width modulation signals from the control unit. The photovoltaic micro grid-connected inverter utilizes the program control pulse width modulation technology, enables the output voltage waveform of the inverter to be pure sine wave, enables output voltage, frequency and phase to be matched with an electric supply power grid all the time, and can generate electricity parallel grid mode. In addition, a traditional power frequency transformation inversion method is removed, a transformer is not required, and the inverter is small in size, light in weight and high in energy conversion efficiency.
Description
Technical field
The utility model relates to inverter, the little combining inverter of especially a kind of photovoltaic.
Background technology
Inverter is the photovoltaic system most important equipment, and the demand that the development in photovoltaic generation market drives inverter rises significantly.Photovoltaic generation application from now on will be main with the form of generating electricity by way of merging two or more grid systems, and the market demand of photovoltaic combining inverter gross power then will equal even greater than the total installed capacity power of photovoltaic system, market prospects are very wide.The driving of policy is accelerated the cost decrease speed of photovoltaic system greatly; According to the prediction of many mechanisms, photovoltaic generation probably before and after the year two thousand twenty, just can realize " par online " become mid-21st Century alternative energy source the most likely and the end of this century main force the most likely energy.
The low frequency configuration that roughly is divided into interconnection technology is incorporated into the power networks and high-frequency structure is incorporated into the power networks, and the low frequency interconnection technology is ripe, and at present domestic have large quantities of companies being engaged in the research and development production of this product, and the research and development of high-frequency structure combining inverter are produced also seldom.At present, the overwhelming majority of grid-connected employing is the low frequency isolation design of transformer, and efficient is lower, and the intrinsic cost of equipment is high, and installation cost is high, and inconvenience is installed, and a machine breakdown will cause the inefficacy of solar energy in large area plate not worked.And adopt the little combining inverter of high frequency, and will effectively improve above-mentioned shortcoming, along with greatly developing of photovoltaic market, the future market prospect space is wide.
Summary of the invention
The purpose of the utility model is to provide a kind of efficient and little combining inverter of lower-cost low frequency photovoltaic.
The little combining inverter of a kind of photovoltaic; The inverter circuit that it comprises booster circuit, is connected the DC filter between direct-flow input end and the booster circuit and is connected the booster circuit output; It is characterized in that, the output of said inverter circuit through relay circuit with to exchange the EMC filter continuous; Said inverter circuit is a full bridge inverter, and the control end of the device for power switching that it adopts links to each other with control unit, receives low frequency sinusoidal pulse width modulation signal from control unit.
In a preferred embodiment, also be connected with filter inductance between the output of said inverter circuit and the relay circuit.
The little combining inverter of the photovoltaic of the utility model utilizes program control pulse modulation technology, makes that the output voltage waveforms of device is a pure sine wave, and output voltage, frequency and phase place are complementary with utility grid all the time, can generate electricity by way of merging two or more grid systems.In addition, eliminated traditional power frequency transformation inverse method, do not needed transformer, so volume is little, in light weight, energy conversion efficiency is high.The more important thing is; Such inversion form is fit to the very wide situation of input voltage range; Help being complementary with the solar cell of various capacity; Also being applicable to simultaneously same other big emerging energy power supplys of input voltage range such as hydrogen fuel cell, is an inexorable trend of inverter development from now on.
Description of drawings
Fig. 1 is the circuit structure block diagram of the little combining inverter of photovoltaic of an embodiment.
Embodiment
To combine specific embodiment and accompanying drawing that the little combining inverter of the utility model photovoltaic is described in further detail below.Each frame of broken lines among Fig. 1 is represented a circuit elements device or the circuit module that can realize specific function.
As shown in Figure 1, in the preferred embodiment, the little combining inverter of photovoltaic mainly comprises DC filter L1, booster circuit, inverter circuit, the relay circuit that is linked in sequence and exchanges the EMC filter.The little combining inverter of photovoltaic also comprises the control unit (figure does not show) that links to each other with inverter circuit with booster circuit.
Wherein, DC filter L1 adopts the common mode DC filter, and its output is parallel with dc filter capacitor C1.
Booster circuit adopts Boost structure booster circuit, comprises inductance L 2, diode D1 and triode Q1.Inductance L 2 one ends link to each other with the high-voltage output terminal of DC filter L1, and the other end links to each other with the anode of diode D1 and the emitter of triode Q1.The emitter of triode Q1 links to each other with the low-voltage output of DC filter L1 and as the low-voltage output of booster circuit, its base stage links to each other with control unit, the controlled unit controls of its on off state.The negative electrode of diode D1 is as the high-voltage output terminal of booster circuit.The output of booster circuit is parallel with dc filter capacitor C2.
The full bridge inverter that inverter circuit is made up of switching tube Q2, Q3, Q4 and Q5.In the present embodiment; All adopt IGBT (Insulated Gate Bipolar Transistor; Insulated gate bipolar transistor) as its device for power switching; And on each switching tube all inverse parallel diode is arranged, grid links to each other with control unit, receives low frequency sinusoidal pulse width modulation signal (SPWM) from control unit.The control unit of the utility model adopts program control pulse modulation technology, makes that the output voltage waveforms of inverter circuit is a pure sine wave, and its output voltage, frequency and phase place are complementary with utility grid all the time, can generate electricity by way of merging two or more grid systems.Simultaneously; Control unit has used at system programmable and has used Programmable Technology; The staff can at any time make amendment to the chip program of control unit; Need not remove chip, make production, debugging, the maintenance of the little combining inverter of whole photovoltaic oversimplify, greatly reduce development cost and maintenance cost.For making the exportable SPWM signal of control unit, prestore the form of the value of the each point that comprises SIN function in the memory of control unit (EEPROM).In the work, control unit ceaselessly takes out SIN function from form data are controlled the duty ratio of pwm signal, make the variation of duty ratio of pwm signal become with the variation of sine function.Then, after the low pass filter in usefulness interchange EMC (Electro Magnetic Compatibility) filter is filtered away the PWM ripple filtering of high frequency, the sine wave of just remaining low frequency.
Control unit has also been used instead " islet operation " resist technology.When generating electricity by way of merging two or more grid systems operation; When electrical network occur to have a power failure because of fortuitous event, control unit can in time detect the grid power blackout situation, and control relay circuit breaks off and being connected of electrical network; Stop its output L and N to grid transmission, to protect the safety of the person and the little combining inverter of photovoltaic.For guaranteeing inverter stable operation, two outputs of inverter circuit are in series with filter inductance L3 and L4 respectively.
Because the little combining inverter of the utility model photovoltaic has been eliminated traditional power frequency transformation inverse method; Do not use advanced relatively high frequency transformation inverse method yet; But adopted more advanced nothing to isolate inversion transformation technique; Do not need transformer, no matter be that aspects such as volume, weight, efficient all are superior to preceding two kinds of methods.The more important thing is that such inversion form is fit to the very wide situation of input voltage range.Help coupling, also be applicable to same other big emerging energy power supplys of input voltage range such as hydrogen fuel cell simultaneously with the solar cell of various capacity.It is an inexorable trend of inverter development from now on.In addition, remove Industrial Frequency Transformer in the inverter from, reduced device volume, alleviated installation weight, reduced installation cost.Traditional inverter uses power frequency rate transformer, it accounted for whole installation weight 80%, cost 50%, volume 50%.Very uneconomical, and consumable is very big.Though high frequency transformer has reduced volume greatly, also make the efficient of inverter itself improve simultaneously.
Though the description to the utility model combines above specific embodiment to carry out,, those skilled in the art that can carry out many replacements, modification and variation according to above-mentioned content, be conspicuous.Therefore, all are such substitute, improve and change all is included in the spirit and scope of attached claim.
Claims (2)
1. little combining inverter of photovoltaic; The inverter circuit that comprises booster circuit, is connected the DC filter between direct-flow input end and the booster circuit and is connected the booster circuit output; It is characterized in that, the output of said inverter circuit through relay circuit with to exchange the EMC filter continuous; Said inverter circuit is a full bridge inverter, and the control end of the device for power switching that it adopts links to each other with control unit, receives low frequency sinusoidal pulse width modulation signal from control unit.
2. the little combining inverter of photovoltaic according to claim 1 is characterized in that, also is connected with filter inductance between the output of said inverter circuit and the relay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202311800U CN202535091U (en) | 2012-05-22 | 2012-05-22 | Photovoltaic micro grid-connected inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202311800U CN202535091U (en) | 2012-05-22 | 2012-05-22 | Photovoltaic micro grid-connected inverter |
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| Publication Number | Publication Date |
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| CN202535091U true CN202535091U (en) | 2012-11-14 |
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| CN2012202311800U Expired - Fee Related CN202535091U (en) | 2012-05-22 | 2012-05-22 | Photovoltaic micro grid-connected inverter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935195A (en) * | 2014-03-11 | 2015-09-23 | 三洋电机株式会社 | Inverter device |
| CN106230297A (en) * | 2016-08-30 | 2016-12-14 | 江苏耐思特新能源科技有限公司 | A kind of multifunctional intellectual bi-directional inverter |
| CN108233404A (en) * | 2016-12-21 | 2018-06-29 | 南京工程学院 | Actively anti-reverse flow pattern single-phase grid-connected inverter |
| CN109494782A (en) * | 2017-09-11 | 2019-03-19 | 沈阳兴东控制技术有限公司 | A kind of control method of family photovoltaic heating contravariant equipment |
-
2012
- 2012-05-22 CN CN2012202311800U patent/CN202535091U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935195A (en) * | 2014-03-11 | 2015-09-23 | 三洋电机株式会社 | Inverter device |
| CN106230297A (en) * | 2016-08-30 | 2016-12-14 | 江苏耐思特新能源科技有限公司 | A kind of multifunctional intellectual bi-directional inverter |
| CN106230297B (en) * | 2016-08-30 | 2018-09-11 | 深圳耐斯特思新能源科技有限公司 | A kind of multifunctional intellectual bi-directional inverter |
| CN108233404A (en) * | 2016-12-21 | 2018-06-29 | 南京工程学院 | Actively anti-reverse flow pattern single-phase grid-connected inverter |
| CN109494782A (en) * | 2017-09-11 | 2019-03-19 | 沈阳兴东控制技术有限公司 | A kind of control method of family photovoltaic heating contravariant equipment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20130522 |