CN202617030U - Multi-level photovoltaic grid connected inverter with isolation transformer - Google Patents
Multi-level photovoltaic grid connected inverter with isolation transformer Download PDFInfo
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- CN202617030U CN202617030U CN 201220215710 CN201220215710U CN202617030U CN 202617030 U CN202617030 U CN 202617030U CN 201220215710 CN201220215710 CN 201220215710 CN 201220215710 U CN201220215710 U CN 201220215710U CN 202617030 U CN202617030 U CN 202617030U
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- photovoltaic grid
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- isolation transformer
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Abstract
The utility model discloses a multi-level photovoltaic grid connected inverter with an isolation transformer. The inverter consists of a power supply, a front DC/DC converter, a high-frequency sinusoidal pulse width modulation (SPWM) circuit, a high-frequency isolation transformer, a rectifying unit, a filtering and reversing unit, a first capacitor and a second capacitor; the power supply is connected in parallel with the first capacitor; the front DC/DC converter is connected in parallel with the first capacitor and the second capacitor; the high-frequency SPWM circuit is connected in parallel with the second capacitor and connected with the rectifying unit through the high-frequency isolation transformer; the rectifying unit is connected with the filtering and reversing unit; and the high-frequency isolation transformer is formed by coupling a first inductor and a second inductor. The inverter reduces the loss of switching devices as much as possible, and achieves high conversion efficiency.
Description
Technical field
The utility model relates to the power converter technical field, is 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.
The utility model content
The purpose of the utility model is to overcome the above problem that prior art exists; A kind of multilevel photovoltaic grid-connected inverter with isolating transformer is provided; The utility model 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 utility model is realized 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.
The advantage of the utility model 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 the utility model technical scheme, in order more to know the technological means of understanding the utility model, and can implement according to the content of specification, below with the preferred embodiment of the utility model and conjunction with figs. specify as after.The embodiment of the utility model is provided by following examples and accompanying drawing thereof in detail.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the main circuit structure sketch map of the utility model;
Fig. 2 is the circuit working waveform sketch map of the utility model.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the utility model.
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 preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
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 |
|---|---|---|---|
| CN 201220215710 CN202617030U (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 |
|---|---|---|---|
| CN 201220215710 CN202617030U (en) | 2012-05-15 | 2012-05-15 | Multi-level photovoltaic grid connected inverter with isolation transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202617030U true CN202617030U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220215710 Expired - Lifetime CN202617030U (en) | 2012-05-15 | 2012-05-15 | Multi-level photovoltaic grid connected inverter with isolation transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202617030U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709936A (en) * | 2012-05-15 | 2012-10-03 | 江苏固德威电源科技有限公司 | Multi-level photovoltaic grid-connected inverter with isolation transformer |
| EP3093973A4 (en) * | 2014-01-10 | 2017-07-12 | Sumitomo Electric Industries, Ltd. | Power conversion device and three-phase alternating current power supply device |
-
2012
- 2012-05-15 CN CN 201220215710 patent/CN202617030U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709936A (en) * | 2012-05-15 | 2012-10-03 | 江苏固德威电源科技有限公司 | Multi-level photovoltaic grid-connected inverter with isolation transformer |
| EP3093973A4 (en) * | 2014-01-10 | 2017-07-12 | Sumitomo Electric Industries, Ltd. | Power conversion device and three-phase alternating current power supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215000 No. 189, Kunlun mountain road, hi tech Industrial Development Zone, Jiangsu, Suzhou Patentee after: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO., LTD. Address before: 215000 No. 189, Kunlun mountain road, hi tech Industrial Development Zone, Jiangsu, Suzhou Patentee before: Jiangsu Goodwe Power Supply Technology Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Patentee after: Goodway Technology Co.,Ltd. Address before: 215000 No. 189, Kunlunshan Road, high tech Industrial Development Zone, Suzhou, Jiangsu Patentee before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121219 |