CN102709936A - Multi-level photovoltaic grid-connected inverter with isolation transformer - Google Patents
Multi-level photovoltaic grid-connected inverter with isolation transformer Download PDFInfo
- Publication number
- CN102709936A CN102709936A CN2012101485320A CN201210148532A CN102709936A CN 102709936 A CN102709936 A CN 102709936A CN 2012101485320 A CN2012101485320 A CN 2012101485320A CN 201210148532 A CN201210148532 A CN 201210148532A CN 102709936 A CN102709936 A CN 102709936A
- Authority
- CN
- China
- Prior art keywords
- photovoltaic grid
- unit
- isolation transformer
- connected inverter
- filtering
- 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
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses a multi-level photovoltaic grid-connected inverter with an isolation transformer. The multi-level photovoltaic grid-connected inverter comprises a power source, a preposed DC/DC converter, a high-frequency SPWM (sinusoidal pulse width modulation) modulation circuit, a high-frequency isolation transformer, a rectification unit, a filtering and inverting unit, a first capacitor and a second capacitor, wherein the power source is connected with the first capacitor in parallel; the preposed DC/DC converter is connected with the first capacitor in parallel and is connected with the second capacitor in parallel; the high-frequency SPWM modulation circuit is connected with the second capacitor in parallel, and is connected with the rectification unit through the high-frequency isolation transformer; the rectification unit is connected with the filtering and inverting unit; and the high-frequency isolation transformer is formed by a first inductor and a second inductor in coupling. With the adoption of the multi-level photovoltaic grid-connected inverter with the isolation transformer, the loss of switch devices is reduced as far as possible; and high conversion efficiency is achieved.
Description
Technical field
The present invention relates to the power converter technical field, be specifically related to a kind of multilevel photovoltaic grid-connected inverter with isolating transformer.
Background technology
The voltage on the former limit of high frequency transformer of traditional high-frequency isolation photovoltaic combining inverter all be within a certain period of time one constant, the pulse of transformer secondary output fixed amplitude transfers the energy to electrical network through filtering device then after ovennodulation.Because line voltage is sinusoidal variations, for satisfy whole electrical network in the cycle inverter energy can both be sent to electrical network, the potential pulse amplitude that need satisfy the output of transformer secondary is greater than the civil power peak value.And in fact owing to the voltage constant of transformer former limit input, the pulse amplitude of secondary output all is to remain on the civil power peak value in the cycle at whole civil power.Therefore in the most of the time in civil power cycle, high pulse meeting causes filtering device loss, rectifying device loss, also can cause the meaningless loss of the former limit of transformer modulation device simultaneously.
Summary of the invention
The objective of the invention is to overcome the above problem that prior art exists; A kind of multilevel photovoltaic grid-connected inverter with isolating transformer is provided; The present invention is through adding one-level DC/DC converter between solar panel and high frequency transformer; And the output voltage of control DC/DC converter is an on-fixed value of following the civil power variation with fixed proportion; To reach the purpose that reduces the former limit of transformer modulation device, secondary rectifying device and filtering device loss, promote the reliability and the conversion efficiency of combining inverter.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention realizes through following technical scheme:
The multilevel photovoltaic grid-connected inverter of band isolating transformer; Form by power supply, preposition DC/DC converter, high frequency SPWM modulation circuit, high-frequency isolation transformer, rectification unit, filtering and reversing unit, first electric capacity and second electric capacity; Said power supply is parallelly connected with first electric capacity; Said preposition DC/DC converter and said first electric capacity, and parallelly connected with second electric capacity, said high frequency SPWM modulation circuit is parallelly connected with second electric capacity; Said high frequency SPWM modulation circuit is connected with said rectification unit through high-frequency isolation transformer, and said rectification unit is connected with said filtering and reversing unit.
Further, said high-frequency isolation transformer is made up of first inductance and second inductance coupling high.
Further, BUCK, BOOST and BUCK-BOOST circuit are selected according to the physical relationship of input and output voltage in said preposition DC/DC unit, and adapt to line voltage through the turn ratio of adjustment transformer.
Further, said high frequency SPWM modulation circuit is by full-bridge or half-bridge or push away and exempt from circuit and form.
Further, said rectification unit is made up of all-wave or bridge rectifier.
Further, said filtering and reversing unit include the inductance capacitor filtering unit, and reversing unit.
Advantage of the present invention is:
Reduce the loss of switching device as much as possible, reached very high conversion efficiency.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention, understands technological means of the present invention in order can more to know, and can implement according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. specify as after.Embodiment of the present invention is provided by following examples and accompanying drawing thereof in detail.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is a main circuit structure sketch map of the present invention;
Fig. 2 is a circuit working waveform sketch map of the present invention.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
Shown in seeing figures.1.and.2; The multilevel photovoltaic grid-connected inverter of band isolating transformer; Be made up of power supply A, preposition DC/DC converter B, high frequency SPWM modulation circuit C, high-frequency isolation transformer D, rectification unit E, filtering and reversing unit F, first capacitor C 1 and second capacitor C 2, said power supply A is parallelly connected with first capacitor C 1, said preposition DC/DC converter B and said first capacitor C 1; And it is parallelly connected with second capacitor C 2; Said high frequency SPWM modulation circuit C is parallelly connected with second capacitor C 2, and said high frequency SPWM modulation circuit C is connected with said rectification unit E through high-frequency isolation transformer D, and said rectification unit E is connected with said filtering and reversing unit F.
Further, said high-frequency isolation transformer D is made up of first inductance L 1 and second inductance 2L coupling.
Further, said preposition DC/DC unit B is selected BUCK, BOOST and BUCK-BOOST circuit according to the physical relationship of input and output voltage, and adapts to line voltage through the turn ratio of adjustment transformer.
Further, said high frequency SPWM modulation circuit C is by full-bridge or half-bridge or push away and exempt from circuit and form.
Further, said rectification unit E is made up of all-wave or bridge rectifier.
Further, said filtering and reversing unit F include the inductance capacitor filtering unit, and reversing unit.
The operation principle of present embodiment is following:
When Vset was following, DC/DC convertor controls output voltage V bus was a fixed value at the civil power instantaneous value, and when the civil power instantaneous value reaches certain Vset when above, DC/DC controller control output voltage is one and follows the on-fixed value that civil power changes with fixed proportion.Again through after the SPWM modulation, make the amplitude of the voltage waveform after the rectification just can reach the level value of nearly half high frequency modulated frequency number.These pulse voltages that are close to the civil power instantaneous value as far as possible just can obtain sinusoidal output current through filtering switching-over back.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. be with the multilevel photovoltaic grid-connected inverter of isolating transformer; It is characterized in that: form with second electric capacity (C2) by power supply (A), preposition DC/DC converter (B), high frequency SPWM modulation circuit (C), high-frequency isolation transformer (D), rectification unit (E), filtering and reversing unit (F), first electric capacity (C1); Said power supply (A) is parallelly connected with first electric capacity (C1); Said preposition DC/DC converter (B) and said first electric capacity (C1); And (C2) is parallelly connected with second electric capacity; Said high frequency SPWM modulation circuit (C) is parallelly connected with second electric capacity (C2), and said high frequency SPWM modulation circuit (C) is connected with said rectification unit (E) through high-frequency isolation transformer (D), and said rectification unit (E) is connected with said filtering and reversing unit (F).
2. the multilevel photovoltaic grid-connected inverter of band isolating transformer according to claim 1 is characterized in that: said high-frequency isolation transformer (D) is made up of first inductance (L1) and second inductance (L2) coupling.
3. the multilevel photovoltaic grid-connected inverter of band isolating transformer according to claim 1; It is characterized in that: BUCK, BOOST and BUCK-BOOST circuit are selected according to the physical relationship of input and output voltage in said preposition DC/DC unit (B), and adapt to line voltage through the turn ratio of adjustment transformer.
4. the multilevel photovoltaic grid-connected inverter of band isolating transformer according to claim 1 is characterized in that: said high frequency SPWM modulation circuit (C) is by full-bridge or half-bridge or push away and exempt from circuit and form.
5. the multilevel photovoltaic grid-connected inverter of band isolating transformer according to claim 1 is characterized in that: said rectification unit (E) is made up of all-wave or bridge rectifier.
6. the multilevel photovoltaic grid-connected inverter of band isolating transformer according to claim 1 is characterized in that: said filtering and reversing unit (F) include the inductance capacitor filtering unit, and reversing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101485320A CN102709936A (en) | 2012-05-15 | 2012-05-15 | Multi-level photovoltaic grid-connected inverter with isolation transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101485320A CN102709936A (en) | 2012-05-15 | 2012-05-15 | Multi-level photovoltaic grid-connected inverter with isolation transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102709936A true CN102709936A (en) | 2012-10-03 |
Family
ID=46902552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101485320A Pending CN102709936A (en) | 2012-05-15 | 2012-05-15 | Multi-level photovoltaic grid-connected inverter with isolation transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102709936A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607032A (en) * | 2013-11-20 | 2014-02-26 | 梁一桥 | Renewable energy generating, power transmission and transformation and electrical network access integrated system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6330170B1 (en) * | 1999-08-27 | 2001-12-11 | Virginia Tech Intellectual Properties, Inc. | Soft-switched quasi-single-stage (QSS) bi-directional inverter/charger |
| CN1988310A (en) * | 2006-11-09 | 2007-06-27 | 上海大学 | Current source type photovoltiac parallel-in system and its control device and method |
| CN202076953U (en) * | 2011-05-23 | 2011-12-14 | 盈威力新能源科技(上海)有限公司 | H bridge photovoltaic grid connection inverter |
| CN202617030U (en) * | 2012-05-15 | 2012-12-19 | 江苏固德威电源科技有限公司 | Multi-level photovoltaic grid connected inverter with isolation transformer |
-
2012
- 2012-05-15 CN CN2012101485320A patent/CN102709936A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6330170B1 (en) * | 1999-08-27 | 2001-12-11 | Virginia Tech Intellectual Properties, Inc. | Soft-switched quasi-single-stage (QSS) bi-directional inverter/charger |
| CN1988310A (en) * | 2006-11-09 | 2007-06-27 | 上海大学 | Current source type photovoltiac parallel-in system and its control device and method |
| CN202076953U (en) * | 2011-05-23 | 2011-12-14 | 盈威力新能源科技(上海)有限公司 | H bridge photovoltaic grid connection inverter |
| CN202617030U (en) * | 2012-05-15 | 2012-12-19 | 江苏固德威电源科技有限公司 | Multi-level photovoltaic grid connected inverter with isolation transformer |
Non-Patent Citations (1)
| Title |
|---|
| 王翀: "两级式光伏并网逆变器及其功率解耦研究", 《中国优秀硕士学位论文全文数据库(工程科技Ⅱ辑)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607032A (en) * | 2013-11-20 | 2014-02-26 | 梁一桥 | Renewable energy generating, power transmission and transformation and electrical network access integrated system |
| CN103607032B (en) * | 2013-11-20 | 2016-08-17 | 梁一桥 | Renewable energy power generation, power transmission and transformation and electrical network access integral system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bac et al. | A SiC-based matrix converter topology for inductive power transfer system | |
| CN202444440U (en) | Bridgeless inverter circuit and solar bridgeless inverter | |
| CN103269537B (en) | Multi-circuit current-limiting power supplying circuit, controlling method thereof and current-limiting power supplying method thereof | |
| Dusmez et al. | A fully integrated three-level isolated single-stage PFC converter | |
| CN103023362A (en) | Bridgeless inverter circuit and solar bridgeless inverter | |
| US11569746B2 (en) | DC coupled electrical converter | |
| US8537585B2 (en) | DC-AC converter | |
| CN103269164B (en) | The quasi-single-stage high power factor circuit of former limit current constant control and device | |
| CN103326606A (en) | One-phase five-level inverter | |
| CN203327305U (en) | Bridge-free PFC plus T type three-level inversion frequency-conversion light modulator | |
| CN102447396A (en) | Transformer with high set-up ratio, solar inverter and solar battery system | |
| CN103647448B (en) | Integrated step-down-flyback type high power factor constant current circuit and device | |
| CN102088252B (en) | Inverter without transformer realized by switched capacitor and applications of inverter | |
| CN102437759A (en) | High-efficiency grid inverter circuit | |
| US10079557B2 (en) | Efficient resonant topology for DC-AC inversion with minimal use of high frequency switches | |
| KR20190115364A (en) | Single and three phase combined charger | |
| CN103888010A (en) | High-frequency isolated type three-level inverter based on push-pull converter | |
| CN105792438A (en) | Buck type single-stage LED drive circuit of unity power factor | |
| CN203617902U (en) | Integrated buck-flyback type high power factor constant current circuit and device | |
| CN102255356A (en) | Efficient uninterruptible power supply | |
| CN109905035B (en) | Ultralow ripple electric automobile charging power supply with bidirectional energy flow | |
| CN202617030U (en) | Multi-level photovoltaic grid connected inverter with isolation transformer | |
| CN102545670A (en) | Novel power-level topological structure of micro inverter | |
| CN202334349U (en) | Direct current isolated grid-connected inversion circuit and photovoltaic inversion system | |
| CN102222966A (en) | Uninterrupted power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121003 |