CN203839977U - Photovoltaic inverting device - Google Patents
Photovoltaic inverting device Download PDFInfo
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- CN203839977U CN203839977U CN201420234166.5U CN201420234166U CN203839977U CN 203839977 U CN203839977 U CN 203839977U CN 201420234166 U CN201420234166 U CN 201420234166U CN 203839977 U CN203839977 U CN 203839977U
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- photovoltaic
- detection module
- photovoltaic array
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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
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Abstract
The utility model provides a photovoltaic inverting device which is characterized by comprising a photovoltaic array, a photovoltaic array filter capacitor, an inverting part, a filter and a control part, wherein the photovoltaic array filter capacitor is arranged in parallel with the photovoltaic array, the inverting part includes a high-gain DC/DC converter, a direct-current bus capacitor and an inverting unit and is arranged between the photovoltaic array filter capacitor and a power grid, the filter is arranged between the power grid and the inverting unit, and the control part includes a grid-connected current detection module, a power grid voltage detection module, a direct-current bus voltage detection module, a photovoltaic output voltage detection module, a photovoltaic output current detection module and a DSP control module. The photovoltaic inverting device provided by the utility model has a wide photovoltaic array output voltage range, the purposes of stabilizing the direct-current bus voltage across the two ends of the direct-current bus capacitor and effectively suppressing common-mode leakage current are achieved, and power-frequency alternating current grid-connected output is realized eventually. The whole device has the advantages of being safe and reliable, and higher in efficiency.
Description
Technical field
The utility model relates to photovoltaic inversion field, is specifically related to a kind of photovoltaic inverter.
Background technology
Solar energy is clean, environmental protection, inexhaustible, nexhaustible, is the important directions of future source of energy development.For the more convenient solar energy that effectively utilizes, the luminous energy that solar energy need to be produced is converted to by photovoltaic grid-connected device the electrical network electric energy that the power consumption equipment in power supply network uses.At present, photovoltaic array output voltage range is wide, and traditional single stage type photovoltaic parallel in system is had relatively high expectations to the output voltage of photovoltaic array, and in order to ensure the safe and reliable operation of system, conventionally add Industrial Frequency Transformer to realize the electrical isolation of photovoltaic array and electrical network in net side, tradition two-stage type photovoltaic parallel in system, adds high frequency transformer to realize electrical isolation in prime conventionally.Because net side frequency is low, Industrial Frequency Transformer is bulky and involve great expense; If add high frequency transformer can further reduce the efficiency of system in prime.Along with the development of photovoltaic technology, raise the efficiency, cost-saving and wide input has become research and one of core objective of design photovoltaic combining inverter.Transformerless non-isolated grid-connected inverter has the advantages that volume is little, efficiency is high, price is low.But in transformerless non-isolation type photovoltaic parallel in system, there is electrical connection in electrical network and photovoltaic array.
Utility model content
The utility model carries out in order to solve above-mentioned problem, and object is to provide a kind of photovoltaic inverter, the electrical network electric energy using for the power consumption equipment that is power supply network by transform light energy.
The photovoltaic inverter that the utility model provides, the electrical network electric energy using for the power consumption equipment that is power supply network by transform light energy, there is such feature, comprise: photovoltaic array, be used for changing luminous energy into galvanic original electric energy, photovoltaic array filter capacitor, for direct current is filtered to output filtering direct current, be in parallel with photovoltaic array, inversion portion, comprise high-gain DC/DC converter, dc-link capacitance and inversion unit, be arranged between photovoltaic array filter capacitor and electrical network, filter, be arranged between electrical network and inversion unit, control part, comprise grid-connected current detection module, network voltage detection module, DC bus-bar voltage detection module, photovoltaic output voltage detection module, photovoltaic output electric current measure module and DSP control module, filtering direct current is carried out boost conversion output voltage boosting dc electricity by high-gain DC/DC converter, be in parallel with photovoltaic array filter capacitor, dc-link capacitance carries out voltage stabilizing output direct current of voltage regulation to voltage boosting dc electricity, be in parallel with high-gain DC/DC converter and inversion unit, inversion unit is the full-bridge inverter with dc bypass, direct current of voltage regulation is converted to industrial-frequency alternating current, industrial-frequency alternating current is filtered into synchronization AC electricity by filter, grid-connected current detection module is for detection of the electric current of synchronization AC electricity, be arranged between filter and electrical network, network voltage detection module is for detection of the voltage of electrical network, be in parallel with electrical network, DC bus-bar voltage detection module is for detection of the voltage at dc-link capacitance two ends, be in parallel with dc-link capacitance, photovoltaic output voltage detection module is for detection of the voltage at photovoltaic array filter capacitor two ends, be in parallel with photovoltaic array filter capacitor, photovoltaic output electric current measure module is for detection of galvanic electric current, be arranged between photovoltaic array and high-gain DC/DC converter, DSP control module is connected with electrical network with network voltage detection module by grid-connected current detection module, be connected with dc-link capacitance by DC bus-bar voltage detection module, also be connected with photovoltaic array with photovoltaic output electric current measure module by photovoltaic output voltage detection module.
In photovoltaic inverter provided by the utility model, also there is such feature: also comprise major loop circuit breaker, be connected for the circuit disconnecting between filter and electrical network, be arranged between filter and electrical network.
In photovoltaic inverter provided by the utility model, can also there is such feature: high-gain DC/DC power converter cells is crisscross parallel Boost circuit converter.
The effect of utility model and effect
The photovoltaic inverter related according to the utility model, by crisscross parallel Boost circuit, the wide direct current of voltage range of photovoltaic array output is upgraded to the stable direct current that meets inversion demand, also by employing, direct current is converted to needed alternating current by the full-bridge inverter with dc bypass, realize the DC bus-bar voltage at stable DC bus capacitor two ends simultaneously and effectively suppress common mode leakage current, finally realizing the grid-connected output of industrial-frequency alternating current.Whole device has advantages of safe and reliable, and its output characteristic merchandiser polarity is identical, has higher efficiency.
Brief description of the drawings
Fig. 1 is the structural representation of the photovoltaic inverter in the utility model embodiment.
Concrete case study on implementation
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, following examples are specifically addressed the related photovoltaic inverter of the utility model by reference to the accompanying drawings.
< embodiment >
Fig. 1 is the structural representation of the photovoltaic inverter in the utility model embodiment.
As shown in Figure 1, photovoltaic inverter 100 in the present embodiment comprises: photovoltaic array 1, photovoltaic array filter capacitor 2, inversion portion 3, filter 4, control part 5 and major loop circuit breaker 6.Control part 5 is controlled the switch closure of inversion portion 3, the switch closure of major loop circuit breaker 6.
Photovoltaic array 1 is the input that is connected to inversion portion 3, has by day under the condition of solar light irradiation, and photovoltaic array 1 obtains the luminous energy of the sun, is then the original electric energy of direct current form by transform light energy.
Photovoltaic array filter capacitor 2 is in parallel with photovoltaic array 1, filters output filtering direct current for the direct current that photovoltaic array 1 is converted to.
Inversion portion 3 is arranged between photovoltaic array filter capacitor 2 and electrical network, comprises high-gain DC/DC converter 31, dc-link capacitance 32 and inversion unit 33.
In the present embodiment, high-gain DC/DC converter 31 adopts the input element of crisscross parallel Boost circuit as inversion unit 33, high-gain DC/DC converter 31 is in parallel with photovoltaic array filter capacitor 2, and high-gain DC/DC converter 31 boosts and obtains voltage boosting dc electricity having passed through filtration direct current that photovoltaic array 1 and photovoltaic array filter capacitor 2 obtain.
Dc-link capacitance 32 is in parallel with high-gain DC/DC converter 31 and inversion unit 33, and dc-link capacitance 32, for the stable voltage that is carried in inversion unit 33 two ends, stabilizes to the direct current that is input to inversion unit 33 direct current of voltage regulation that meets inversion demand.
Inversion unit 33 is the full-bridge inverters with dc bypass, with the full-bridge inverter of dc bypass, direct current of voltage regulation is converted to industrial-frequency alternating current, and the industrial-frequency alternating current after filtering backward electrical network of device 4 is carried electrical network electric energy.
Filter 4 is connected between electrical network and inversion unit 33, and filter 4 filters industrial-frequency alternating current and obtains synchronization AC electricity, exports this synchronization AC electricity by the output of inversion portion 3.
Control part 5 comprises grid-connected current detection module 51, network voltage detection module 52, DC bus-bar voltage detection module 53, photovoltaic output voltage detection module 54, photovoltaic output electric current measure module 55 and DSP control module 56.Grid-connected current detection module 51 is arranged between filter 4 and electrical network.Network voltage detection module 52 is in parallel with electrical network.DC bus-bar voltage detection module 53 is in parallel with dc-link capacitance 32.Photovoltaic output voltage detection module 54 is in parallel with photovoltaic array filter capacitor 2.Photovoltaic output electric current measure module 55 is arranged between photovoltaic array 1 and high-gain DC/DC converter 31.
DSP control module 56 is by connecting grid-connected current detection module 51 and network voltage detection module 52, realization is connected with electrical network, simultaneously, the line voltage that the grid-connected current detecting by collection grid-connected current detection module 51 and network voltage detection module 52 detect, thereby control photovoltaic inverter 100 outputs to the voltage of electrical network, realizes the control to electrical network electrical property.DSP control module 56 is connected with dc-link capacitance 32 by DC bus-bar voltage detection module 51, gathers the voltage at dc-link capacitance 32 two ends, makes direct current of voltage regulation meet inversion demand.DSP control module 56 is also connected with photovoltaic array 1 with photovoltaic output electric current measure module 55 by photovoltaic output voltage detection module 54, gather output voltage and the output current of photovoltaic array 1, carry out the output voltage of maximal power tracing algorithm control photovoltaic array 1, reach the maximum service efficiency of photovoltaic array 1.
Major loop circuit breaker 6 is arranged between filter 4 and electrical network, can realize disconnection photovoltaic inverter 100 be connected with the circuit of electrical network by major loop circuit breaker 6.
The effect of embodiment and effect
The photovoltaic inverter related according to the utility model, by crisscross parallel Boost circuit, the wide direct current of voltage range of photovoltaic array output is upgraded to the stable direct current that meets inversion demand, also by employing, direct current is converted to needed alternating current by the full-bridge inverter with dc bypass, realize the DC bus-bar voltage at stable DC bus capacitor two ends simultaneously and effectively suppress common mode leakage current, finally realizing the grid-connected output of industrial-frequency alternating current.Whole device has advantages of safe and reliable, and its output characteristic merchandiser polarity is identical, has higher efficiency.
Major loop circuit breaker in the present embodiment, is arranged between filter and electrical network, at dark, is connected with electrical network open circuit by major loop circuit breaker, thereby better protects whole photovoltaic inverter.
Above-mentioned execution mode is preferred case of the present utility model, is not used for limiting protection range of the present utility model.
High-gain DC/DC converter is also not only limited to the paralleling and interleaving Boost circuit in preferred case, also can adopt other booster circuits.
Claims (3)
1. a photovoltaic inverter, the electrical network electric energy using for the power consumption equipment that is power supply network by transform light energy, is characterized in that, comprising:
Photovoltaic array, for changing described luminous energy into galvanic original electric energy;
Photovoltaic array filter capacitor, for described direct current is filtered to output filtering direct current, is in parallel with described photovoltaic array;
Inversion portion, comprises high-gain DC/DC converter, dc-link capacitance and inversion unit, is arranged between described photovoltaic array filter capacitor and described electrical network;
Filter, is arranged on described with between electrical network and described inversion unit; And
Control part, comprises grid-connected current detection module, network voltage detection module, DC bus-bar voltage detection module, photovoltaic output voltage detection module, photovoltaic output electric current measure module and DSP control module;
Wherein, described high-gain DC/DC converter, for described filtering direct current being carried out to boost conversion output voltage boosting dc electricity, is in parallel with described photovoltaic array filter capacitor,
Described dc-link capacitance, for described voltage boosting dc electricity being carried out to voltage stabilizing output direct current of voltage regulation, is in parallel with described high-gain DC/DC converter and described inversion unit,
Described inversion unit is the full-bridge inverter with dc bypass, for described direct current of voltage regulation is converted to industrial-frequency alternating current,
Described filter is used for described industrial-frequency alternating current to be filtered into synchronization AC electricity,
Described grid-connected current detection module, for detection of the electric current of described synchronization AC electricity, is arranged between described filter and described electrical network,
Described network voltage detection module, for detection of the voltage of described electrical network, is in parallel with described electrical network,
Described DC bus-bar voltage detection module, for detection of the voltage at described dc-link capacitance two ends, is in parallel with described dc-link capacitance,
Described photovoltaic output voltage detection module, for detection of the voltage at described photovoltaic array filter capacitor two ends, is in parallel with described photovoltaic array filter capacitor,
Described photovoltaic output electric current measure module, for detection of described galvanic electric current, is arranged between described photovoltaic array and described high-gain DC/DC converter,
Described DSP control module is connected with described electrical network with described network voltage detection module by described grid-connected current detection module, be connected with described dc-link capacitance by described DC bus-bar voltage detection module, be also connected with described photovoltaic array with described photovoltaic output electric current measure module by described photovoltaic output voltage detection module.
2. photovoltaic inverter according to claim 1, is characterized in that, also comprises:
Major loop circuit breaker, is connected for the circuit disconnecting between described filter and described electrical network, is arranged between described filter and described electrical network.
3. photovoltaic inverter according to claim 1, is characterized in that:
Wherein, described high-gain DC/DC converter is crisscross parallel Boost circuit converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420234166.5U CN203839977U (en) | 2014-05-08 | 2014-05-08 | Photovoltaic inverting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420234166.5U CN203839977U (en) | 2014-05-08 | 2014-05-08 | Photovoltaic inverting device |
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| Publication Number | Publication Date |
|---|---|
| CN203839977U true CN203839977U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420234166.5U Expired - Fee Related CN203839977U (en) | 2014-05-08 | 2014-05-08 | Photovoltaic inverting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140955A (en) * | 2015-08-14 | 2015-12-09 | 国网天津市电力公司 | Double-full-bridge grid-connected photovoltaic inversion device |
| CN106026180A (en) * | 2016-07-18 | 2016-10-12 | 哈尔滨理工大学 | Solar photovoltaic grid-connected inverter |
| CN110880741A (en) * | 2019-12-02 | 2020-03-13 | 阳光电源股份有限公司 | Inversion system and input misconnection detection method of symmetrical three-level booster circuit of inversion system |
-
2014
- 2014-05-08 CN CN201420234166.5U patent/CN203839977U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140955A (en) * | 2015-08-14 | 2015-12-09 | 国网天津市电力公司 | Double-full-bridge grid-connected photovoltaic inversion device |
| CN106026180A (en) * | 2016-07-18 | 2016-10-12 | 哈尔滨理工大学 | Solar photovoltaic grid-connected inverter |
| CN110880741A (en) * | 2019-12-02 | 2020-03-13 | 阳光电源股份有限公司 | Inversion system and input misconnection detection method of symmetrical three-level booster circuit of inversion system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20150508 |
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| EXPY | Termination of patent right or utility model |