CN202488153U - Grid-connected device for solar power generation - Google Patents
Grid-connected device for solar power generation Download PDFInfo
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- CN202488153U CN202488153U CN2012200374222U CN201220037422U CN202488153U CN 202488153 U CN202488153 U CN 202488153U CN 2012200374222 U CN2012200374222 U CN 2012200374222U CN 201220037422 U CN201220037422 U CN 201220037422U CN 202488153 U CN202488153 U CN 202488153U
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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 discloses a grid-connected device for solar power generation, which is arranged on the output end of a solar photovoltaic array and comprises a direct-current bus capacitor, a three-phase inverting-bridge circuit, an alternating-current filtering circuit, a power-frequency isolating transformer and a controller. After the voltage of the direct current generated by the solar photovoltaic array is stabilized through a direct current bus capacitor and the harmonic components in the direct current are removed by filtering, the direct current is converted into the alternating current which has the same frequency and phase as a power grid by the three-phase inverting-bridge circuit, then the higher-order harmonics in the three-phase alternating current are removed by filtering by the alternating-current filtering circuit, and the alternating current is connected into the power grid. In the grid-connection process, the damage caused by heat dissipation can be reduced to the minimum extent so that the maximum power output is guaranteed and the electric energy input into the power grid contains the lowest harmonics. The grid-connected device for solar power generation is in a single-stage system structure, thus the cost of hardware is reduced greatly. The controller adopts the maximum power tracking algorithm, thus the maximum power is output by the solar photovoltaic array all the way.
Description
Technical field
The utility model relates to the interconnection technology of solar power generation, more particularly relates to a kind of grid-connecting apparatus of solar power generation.
Background technology
Solar energy is compared with other energy as a kind of regenerative resource of green non-pollution, has special advantages.Solar energy has the huge advantage of " inexhaustible ", more and more receives people's favor.Utilization solar energy carries out mainly containing independent operating and generating electricity by way of merging two or more grid systems two kinds before the type order of photovoltaic generation; Wherein independent operation mode needs jumbo storage battery as energy-storage system; And stability is not high; The pattern of generating electricity by way of merging two or more grid systems then is the main flow direction of photovoltaic generation, but the device that generates electricity by way of merging two or more grid systems at present exists the cost cost high, problems such as poor stability.
The utility model content
High to the photovoltaic power generation grid-connecting apparatus cost cost that exists in the prior art, the problem of poor stability, the purpose of the utility model provides a kind of grid-connecting apparatus of solar power generation.
For achieving the above object, the utility model adopts following technical scheme:
A kind of grid-connecting apparatus of solar power generation; Be located at the output end of solar energy photovoltaic array; Comprise dc-link capacitance, three-phase inversion bridge circuit, ac filter circuit, power frequency isolating transformer and controller, said dc-link capacitance is parallelly connected with the solar energy photovoltaic array; The input of said three-phase inversion bridge circuit links to each other with the two ends of dc-link capacitance; The input of said ac filter circuit links to each other with the output of three-phase inversion bridge circuit; The input of said power frequency isolating transformer links to each other with the output of ac filter circuit; The output of said power frequency isolating transformer links to each other with electrical network; The input of said controller all links to each other with the output of input, solar energy photovoltaic array and the dc-link capacitance of the input of ac filter circuit, power frequency isolating transformer, and the output of said controller links to each other with the three-phase inversion bridge circuit.
Said controller comprises arithmetic unit, comparator, pi regulator and three-phase pulse modulator, and the input of said arithmetic unit receives the output current and the output voltage of solar energy photovoltaic array, and the input of said comparator links to each other with the output of arithmetic unit; The input of said pi regulator links to each other with the output of comparator; The input of said three-phase pulse modulator links to each other with the output of pi regulator, and the output of three-phase pulse modulator links to each other with the three-phase inversion bridge circuit.
Said three-phase pulse modulator adopts the space vector pulse width modulation module.
Compared with prior art; Adopt the grid-connecting apparatus of a kind of solar power generation of the utility model; Be located at the output end of solar energy photovoltaic array; Comprise dc-link capacitance, three-phase inversion bridge circuit, ac filter circuit, power frequency isolating transformer and controller, said dc-link capacitance is parallelly connected with the solar energy photovoltaic array; The input of said three-phase inversion bridge circuit links to each other with the two ends of dc-link capacitance; The input of said ac filter circuit links to each other with the output of three-phase inversion bridge circuit; The input of said power frequency isolating transformer links to each other with the output of ac filter circuit; The output of said power frequency isolating transformer links to each other with electrical network; The input of said controller all links to each other with the output of input, solar energy photovoltaic array and the dc-link capacitance of the input of ac filter circuit, power frequency isolating transformer, and the output of said controller links to each other with the three-phase inversion bridge circuit.The direct current that the solar energy photovoltaic array produces is through the voltage stabilizing of dc-link capacitance; And behind the harmonic components in the filtering direct current; The three-phase inversion bridge circuit converts direct current with the alternating current of electrical network with the frequency homophase into;, be connected to the grid at last the high order harmonic component filtering in the three-phase alternating current through ac filter circuit.Like this and network process in, can heat radiation be damaged and reduce to minimum guaranteeing maximum electric energy output, and guarantee that the electric energy that is input in the electrical network has minimum harmonic content.The grid-connecting apparatus of the utility model adopts single-stage property system configuration, and hardware cost will reduce greatly like this.And controller adopts the maximal power tracing algorithm to be called for short MPPT, so just can guarantee that the power of solar energy photovoltaic array output always reaches maximum.Simultaneously,, in algorithm, added the safeguard procedures of island effect, system safety is moved reliably from security consideration.
Description of drawings
Fig. 1 is the principle schematic of grid-connecting apparatus of a kind of solar power generation of the utility model;
Fig. 2 is the circuit diagram that dc-link capacitance, three-phase inversion bridge circuit, ac filter circuit and the power frequency of the utility model isolated;
Fig. 3 is the control structure sketch map of the controller of the utility model.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with accompanying drawing and embodiment.
See also the grid-connecting apparatus of Fig. 1, a kind of solar power generation shown in Figure 2; Be located at the output end of solar energy photovoltaic array 20; The ac filter circuit 13, power frequency isolating transformer 14 and the controller 15 that comprise dc-link capacitance 11, three-phase inversion bridge circuit 12, employing LCL type; Dc-link capacitance 11 is parallelly connected with solar energy photovoltaic array 20; The input of three-phase inversion bridge circuit 12 links to each other with the two ends of dc-link capacitance 11; The input of ac filter circuit 13 links to each other with the output of three-phase inversion bridge circuit 12; The input of power frequency isolating transformer 14 links to each other with the output of ac filter circuit 13, and the output of power frequency isolating transformer 14 links to each other with electrical network 21, and the input of controller 15 links to each other with the output of input, solar energy photovoltaic array 20 and the dc-link capacitance 11 of the input of ac filter circuit 13, power frequency isolating transformer 14 respectively; The output of controller 15 links to each other with three-phase inversion bridge circuit 12, and three-phase inversion bridge circuit 12 mainly is made up of six road insulated gate bipolar transistor T1, T2, T3, T4, T5, T6.Six road insulated gate bipolar transistors that controller 15 control outputs drive three-phase inversion bridge circuit 12 turn-off.This topological structure is simple, just can realize MPPT maximum power point tracking control and parallel network reverse with a Power Conversion link, thereby have high conversion rate.And after ac filter circuit 13, having added power frequency isolating transformer 14, power frequency isolating transformer 14 not only can reduce DC bus-bar voltage, can also realize electrical isolation.
See also shown in Figure 3 again; Its middle controller 15 comprises arithmetic unit 151, comparator 152, pi regulator 153 and adopts the space vector pulse width modulation module to be called for short the three-phase pulse modulator 154 of SVPWM modulation module; The input of arithmetic unit 151 receives the output current and the output voltage of solar energy photovoltaic array 20; The input of comparator 152 links to each other with the output of arithmetic unit 151; The input of pi regulator 153 links to each other with the output of comparator 152, and the input of three-phase pulse modulator 154 links to each other with the output of pi regulator 153, and the output of three-phase pulse modulator 154 links to each other with three-phase inversion bridge circuit 12.U among the figure
Pv, I
PvBe respectively the output voltage and the output current of photovoltaic array, U
a, U
b, U
cBe three phase network voltage, I
a, I
b, I
cBe the output current of three-phase inversion bridge circuit 12, U
DcBe DC bus-bar voltage.Through detecting the output voltage U of photovoltaic array
PvWith output current I
Pv, calculate through arithmetic unit 151, confirm the voltage of peak power output, this voltage is through comparator 152 and DC bus-bar voltage U
DcCarry out arithmetical operation, the value of output is as the command value of the meritorious axle of current inner loop.The output current I of three-phase inversion bridge circuit 12
a, I
b, I
cThrough coordinate transform, be converted into meritorious axle component I
qWith idle axle component I
dThe θ angle that carrying out coordinate transform needs is confirmed through the output of line voltage lock phase phase angle.The meritorious axle of electric current component I
qCarry out computing with the current inner loop command value through comparator, then through the meritorious axis controller of electric current, the meritorious axle of output controlled target vector U
Cqref, in like manner, obtain idle shaft current controlled target vector U
Cdref, two target vectors become the target vector U under three phase coordinate systems through coordinate transform
Caref, U
Cbref, U
CcrefThree target vectors go to control the break-make of insulated gate bipolar transistor through three-phase pulse adjuster 154 outputs six tunnel pulses.
For the power that satisfies 20 outputs of solar energy photovoltaic array reaches maximum constantly, adopted maximal power tracing algorithm MPPT, simultaneously,, in algorithm, added the safeguard procedures of island effect from security consideration, system safety is moved reliably.
Advantages such as arithmetic unit 151 adopts digital chip TMS 320 F 2812 control, and this chip has the processing speed height, and is reliable and stable.And adopt emulation tool to verify the feasibility of device.
The grid-connecting apparatus of the utility model was not at first controlled rectifier bridge through one electrical network is rectified to the direct current about 450V before being incorporated into the power networks, and gave dc-link capacitance 11 chargings.After charging is accomplished, solar energy photovoltaic array 20 is linked in the main circuit.Through the maximal power tracing control algolithm, confirm the set-point of DC bus-bar voltage then.Through digit chip control, realize parallel network reverse at last, so just can the electric energy that solar energy sends be fed back in the electrical network.
Those of ordinary skill in the art will be appreciated that; Above embodiment only is the purpose that is used for explaining the utility model; And be not with the qualification of doing the utility model; As long as in the essential scope of the utility model, in the scope to the variation of the above embodiment, claim that modification all will drop on the utility model.
Claims (3)
1. the grid-connecting apparatus of a solar power generation is located at the output end of solar energy photovoltaic array, it is characterized in that:
Comprise dc-link capacitance, three-phase inversion bridge circuit, ac filter circuit, power frequency isolating transformer and controller, said dc-link capacitance is parallelly connected with the solar energy photovoltaic array; The input of said three-phase inversion bridge circuit links to each other with the two ends of dc-link capacitance; The input of said ac filter circuit links to each other with the output of three-phase inversion bridge circuit; The input of said power frequency isolating transformer links to each other with the output of ac filter circuit; The output of said power frequency isolating transformer links to each other with electrical network; The input of said controller all links to each other with the output of input, solar energy photovoltaic array and the dc-link capacitance of the input of ac filter circuit, power frequency isolating transformer, and the output of said controller links to each other with the three-phase inversion bridge circuit.
2. grid-connecting apparatus according to claim 1 is characterized in that:
Said controller comprises arithmetic unit, comparator, pi regulator and three-phase pulse modulator, and the input of said arithmetic unit receives the output current and the output voltage of solar energy photovoltaic array, and the input of said comparator links to each other with the output of arithmetic unit; The input of said pi regulator links to each other with the output of comparator; The input of said three-phase pulse modulator links to each other with the output of pi regulator, and the output of three-phase pulse modulator links to each other with the three-phase inversion bridge circuit.
3. grid-connecting apparatus according to claim 2 is characterized in that:
Said three-phase pulse modulator adopts the space vector pulse width modulation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200374222U CN202488153U (en) | 2012-02-06 | 2012-02-06 | Grid-connected device for solar power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200374222U CN202488153U (en) | 2012-02-06 | 2012-02-06 | Grid-connected device for solar power generation |
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| Publication Number | Publication Date |
|---|---|
| CN202488153U true CN202488153U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200374222U Expired - Fee Related CN202488153U (en) | 2012-02-06 | 2012-02-06 | Grid-connected device for solar power generation |
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|---|---|
| CN (1) | CN202488153U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217914A (en) * | 2013-03-19 | 2013-07-24 | 刘君 | Low-carbon credit acquisition device, exercise and fitness power generation system and implementation method thereof |
| CN104660088A (en) * | 2015-03-04 | 2015-05-27 | 王曙光 | Variable-frequency inverter system for photovoltaic power generation |
-
2012
- 2012-02-06 CN CN2012200374222U patent/CN202488153U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217914A (en) * | 2013-03-19 | 2013-07-24 | 刘君 | Low-carbon credit acquisition device, exercise and fitness power generation system and implementation method thereof |
| CN104660088A (en) * | 2015-03-04 | 2015-05-27 | 王曙光 | Variable-frequency inverter system for photovoltaic power generation |
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| Date | Code | Title | Description |
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| 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: 20121010 Termination date: 20130206 |
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| CF01 | Termination of patent right due to non-payment of annual fee |