CN105656082A - Voltage stabilization control structure for photovoltaic cell panel set - Google Patents
Voltage stabilization control structure for photovoltaic cell panel set Download PDFInfo
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- CN105656082A CN105656082A CN201610129150.1A CN201610129150A CN105656082A CN 105656082 A CN105656082 A CN 105656082A CN 201610129150 A CN201610129150 A CN 201610129150A CN 105656082 A CN105656082 A CN 105656082A
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- 238000004891 communication Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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- H02J3/385—
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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 invention relates to a voltage stabilization control structure for a photovoltaic cell panel set. The voltage stabilization control structure comprises a first photovoltaic cell panel, a second photovoltaic cell panel and an Nth photovoltaic cell panel. The output ends of the first photovoltaic cell panel, the second photovoltaic cell panel and the Nth photovoltaic cell panel are sequentially and electrically connected with a first direct-current/direct-current converter, a second direct-current/direct-current converter and an Nth direct-current/direct-current converter. The positive electrodes and the negative electrodes of the first direct-current/direct-current converter, the second direct-current/direct-current converter and the Nth direct-current/direct-current converter are sequentially and electrically connected in series. A first photovoltaic cell array is composed of the first photovoltaic cell panel, the second photovoltaic cell panel, the Nth photovoltaic cell panel, the first direct-current/direct-current converter, the second direct-current/direct-current converter and the Nth direct-current/direct-current converter. The voltage output ends of the voltage output ends of the first photovoltaic cell array, the second photovoltaic cell array and the Nth photovoltaic cell array are connected in parallel and electrically connected with the input end of an inverter. The output end of the inverter is electrically connected with a power grid.
Description
Technical field
The present invention relates to a kind of photovoltaic generating system, particularly a kind of photovoltaic battery panel group string Voltage Stability Control structure.
Technical background
In numerous green energy resources, solar energy is widely distributed with it, acquisition is convenient and becomes one of currently the most important ones regenerative resource. After entering 21st century, due to spreading of energy crisis and being rooted in the hearts of the people of environmental protection concept, solar electrical energy generation industry obtains vigorous growth, occupies more and more important position in energy resource supply ratio.
The national conditions of China have very big advantage for development photovoltaic industry, owing to floor space is big, north and south latitude width, sunshine sufficient, illumination condition is very abundant, and the prospect of development photovoltaic generation is boundless.
The photovoltaic generating system of current China is substantially " serial-parallel " formula framework, as shown in Figure 1: namely first several photovoltaic battery panels (being later referred to as cell panel) are together in series, then again cell plate group string is carried out parallel connection, access inverter again and carry out DC/AC conversion, be finally incorporated to utility network.
Owing to inverter is to work under certain voltage range, in a certain voltage range, inverter has higher power conversion efficiency. In order to ensure that inverter has higher conversion efficiency, actual carry out photovoltaic plant planning time, it is followed by a DC to DC converter at each cell plate group string, maintenance group string terminal voltage is a fixed value, each cell plate group one DC to DC converter of concatenation, all of DC to DC converter is finally all connected in parallel on inverter.
Under this framework mode, the voltage of each cell plate group string, after DC to DC converter, maintains in a fixed value. The advantage of this framework is to control simply, it is only necessary to control a DC to DC converter, it is possible to by the voltage stabilization of a group string in a fixed value.
The shortcoming of this framework is single battery plate to be carried out power optimization. When percentage of batteries plate is blocked, the cell panel output current reduction blocked, thus the electric current by whole cell plate group string all drags down, all cell panels all deviate maximum power point, and output loss is serious.
Summary of the invention
It is an object of the invention to provide a kind of photovoltaic battery panel group string Voltage Stability Control structure, in order under maintaining the premise that cell plate group string terminal voltage is constant, make each cell panel operating characteristic consistent, when not being blocked, all with maximum power output.
The object of the present invention is achieved like this, a kind of photovoltaic battery panel group string Voltage Stability Control structure, it is characterized in that: at least include: the first photovoltaic battery panel, the second photovoltaic battery panel, N photovoltaic battery panel; Respectively the first photovoltaic battery panel, the second photovoltaic battery panel, N photovoltaic battery panel outfan be sequentially connected electrically the first DC to DC converter, the second DC to DC converter, N DC to DC converter; First DC to DC converter, the second DC to DC converter, N DC to DC converter positive and negative electrode adopt and be sequentially connected in series electrical connection and carry out voltage output; The first photovoltaic battery array is constituted by the first photovoltaic battery panel, the second photovoltaic battery panel, N photovoltaic battery panel, the first DC to DC converter, the second DC to DC converter, N DC to DC converter, respectively by the first photovoltaic battery array, the second photovoltaic battery array, N photovoltaic battery array voltage output end parallel connection electrically connect with the input of inverter, the outfan of inverter electrically connects with electrical network.
Described the first photovoltaic battery array, the second photovoltaic battery array, N photovoltaic battery array have identical circuit structure.
Described the first photovoltaic battery array, the second photovoltaic battery array, N photovoltaic battery array include a control circuit, telecommunication circuit and outfan control circuit respectively, control circuit obtains the voltage signal of the first DC to DC converter, the second DC to DC converter, N DC to DC converter in self photovoltaic battery array by telecommunication circuit, when the 30% of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array exports, the short circuit of control circuit control output end control circuit.
Described the first photovoltaic battery array, the second photovoltaic battery array, N photovoltaic battery array include a control circuit, telecommunication circuit and outfan control circuit respectively, control circuit obtains the voltage signal of the first DC to DC converter, the second DC to DC converter, N DC to DC converter in self photovoltaic battery array by telecommunication circuit, when the 70% of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array on average exports, the short circuit of control circuit control output end control circuit.
Described control circuit is the single-chip microcomputer with A/D input.
Described outfan control circuit at least includes two switches, and first switch series is connected on positive pole output loop or the negative pole output loop of DC to DC converter; Second switch is attempted by the outfan of DC to DC converter, and when first switch is in off-state, second switch is in short-circuit condition, when after first switch response, after a delay time, and second switch response.
First described switch and second switch are relays.
First described switch and second switch are MOS switch pipes.
Present invention have the advantage that
Owing to each cell panel outfan is connected to a DC to DC converter, when percentage of batteries plate blocked cause that output voltage declines time, its voltage drop-out value meeting real-time report is to central control unit, this voltage drop-out value can be averagely allocated in group string all the other cell panels not being blocked by central control unit, all the other cell panels carry out voltage lifting according to the Voltage Cortrol amount being assigned to, thus the output voltage maintaining whole group of string is fixed.
The magnitude of voltage so distributing to each cell panel lifting is smaller, and near the maximum power point of cell panel, electric current approximately constant.Therefore when cell panel output voltage is finely tuned, electric current is similar to constant, and the output of cell panel is also similar to constant, or near maximum power point. In this case, except the cell panel blocked, all the other cell panels all approximate duty in group string are at maximum power point, and power loss is very little. Plate level optimization can be realized, make control more flexible, optimize more accurate.
Accompanying drawing explanation
Below in conjunction with embodiment accompanying drawing, the invention will be further described:
Fig. 1 is conventional photovoltaic power station photovoltaic battery panel group string Control of Voltage schematic diagram;
Fig. 2 is embodiment of the present invention photovoltaic plant group string Control of Voltage schematic diagram.
In figure, the 1, first photovoltaic battery panel; 2, the second photovoltaic battery panel; 3, N photovoltaic battery panel; 4, the first DC to DC converter; 5, the second DC to DC converter; 6, N DC to DC converter; 7, inverter; 8, electrical network; 9, the first photovoltaic battery array; 10, the second photovoltaic battery array; 11, N photovoltaic battery array.
Detailed description of the invention
Embodiment 1
As in figure 2 it is shown, a kind of photovoltaic battery panel group string Voltage Stability Control structure, at least include: first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel 3; It is sequentially connected electrically first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 respectively at the outfan of first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel 3; First DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 positive and negative electrode adopt and be sequentially connected in series electrical connection and carry out voltage output; The first photovoltaic battery array 9 is constituted by first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel the 3, first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6, being electrically connected with the input of inverter 7 by the voltage output end parallel connection of first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 respectively, the outfan of inverter 7 electrically connects with electrical network 8. Described first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 include a control circuit, telecommunication circuit and outfan control circuit respectively, control circuit obtains the voltage signal of first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 in self photovoltaic battery array by telecommunication circuit, when the threshold value of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array exports, the short circuit of control circuit control output end control circuit. Described control circuit is the single-chip microcomputer with A/D input. Described outfan control circuit at least includes two switches, and first switch series is connected on positive pole output loop or the negative pole output loop of DC to DC converter; Second switch is attempted by the outfan of DC to DC converter, and when first switch is in off-state, second switch is in short-circuit condition, when after first switch response, after a delay time, and second switch response. First described switch and second switch are relays.
Embodiment 2
As in figure 2 it is shown, a kind of photovoltaic battery panel group string Voltage Stability Control structure, at least include: first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel 3;It is sequentially connected electrically first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 respectively at the outfan of first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel 3; First DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 positive and negative electrode adopt and be sequentially connected in series electrical connection and carry out voltage output; The first photovoltaic battery array 9 is constituted by first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel the 3, first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6, being electrically connected with the input of inverter 7 by the voltage output end parallel connection of first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 respectively, the outfan of inverter 7 electrically connects with electrical network 8. Described first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 include a control circuit, telecommunication circuit and outfan control circuit respectively, control circuit obtains the voltage signal of first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 in self photovoltaic battery array by telecommunication circuit, when the threshold value of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array exports, the short circuit of control circuit control output end control circuit. Described control circuit is the single-chip microcomputer with A/D input. Described outfan control circuit at least includes two switches, and first switch series is connected on positive pole output loop or the negative pole output loop of DC to DC converter; Second switch is attempted by the outfan of DC to DC converter, and when first switch is in off-state, second switch is in short-circuit condition, when after first switch response, after a delay time, and second switch response. First described switch and second switch are MOS switch pipes.
Embodiment 3
As in figure 2 it is shown, a kind of photovoltaic battery panel group string Voltage Stability Control structure, at least include: first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel 3; It is sequentially connected electrically first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 respectively at the outfan of first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel 3; First DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 positive and negative electrode adopt and be sequentially connected in series electrical connection and carry out voltage output; The first photovoltaic battery array 9 is constituted by first photovoltaic battery panel the 1, second photovoltaic battery panel 2, N photovoltaic battery panel the 3, first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6, being electrically connected with the input of inverter 7 by the voltage output end parallel connection of first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 respectively, the outfan of inverter 7 electrically connects with electrical network 8. Described first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 include a control circuit, telecommunication circuit and outfan control circuit respectively, control circuit obtains the voltage signal of first DC to DC converter the 4, second DC to DC converter 5, N DC to DC converter 6 in self photovoltaic battery array by telecommunication circuit, when the threshold value of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array on average exports, the short circuit of control circuit control output end control circuit.
Described control circuit is the single-chip microcomputer with A/D input. Described outfan control circuit at least includes two switches, and first switch series is connected on positive pole output loop or the negative pole output loop of DC to DC converter; Second switch is attempted by the outfan of DC to DC converter, and when first switch is in off-state, second switch is in short-circuit condition, when after first switch response, after a delay time, and second switch response. First described switch and second switch are MOS switch pipes.
Embodiment 4
On the basis of embodiment 1, the first described photovoltaic battery array 9, second photovoltaic battery array 10, N photovoltaic battery array 11 includes a control circuit respectively, telecommunication circuit and outfan control circuit, control circuit obtains the first DC to DC converter 4 in self photovoltaic battery array by telecommunication circuit, second DC to DC converter 5, the voltage signal of N DC to DC converter 6, when the 30% of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array exports, the control circuit short circuit of control circuit control output end.
Embodiment 5
On the basis of embodiment 1, the first described photovoltaic battery array 9, second photovoltaic battery array 10, N photovoltaic battery array 11 includes a control circuit respectively, telecommunication circuit and outfan control circuit, control circuit obtains the first DC to DC converter 4 in self photovoltaic battery array by telecommunication circuit, second DC to DC converter 5, the voltage signal of N DC to DC converter 6, when the 70% of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array on average exports, the control circuit short circuit of control circuit control output end.
Heretofore described first photovoltaic battery array the 9, second photovoltaic battery array 10, N photovoltaic battery array 11 have identical circuit structure.
Owing to each cell panel outfan is connected to a DC to DC converter in the present invention, the positive and negative electrode employing of DC to DC converter is sequentially connected in series electrical connection and carries out voltage output, when wherein percentage of batteries plate blocked cause that output voltage declines time, its output electric current declines, when its output electric current reaches threshold value, the output electric current of overall series loop can be affected, by increasing control circuit at each DC to DC converter, telecommunication circuit and outfan control circuit, control circuit obtains the first DC to DC converter 4 in self photovoltaic battery array by telecommunication circuit, second DC to DC converter 5, the voltage of N DC to DC converter 6 or current signal, when the threshold value of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array on average exports, the control circuit short circuit of control circuit control output end, thus the output voltage maintaining whole group of string is fixed.
The magnitude of voltage so distributing to each cell panel lifting is smaller, and near the maximum power point of cell panel, electric current approximately constant. Therefore when cell panel output voltage is finely tuned, electric current is similar to constant, and the output of cell panel is also similar to constant, or near maximum power point. In this case, except the cell panel blocked, all the other cell panels all approximate duty in group string are at maximum power point, and power loss is very little. Plate level optimization can be realized, make control more flexible, optimize more accurate.
Telecommunication circuit in the present invention adopts existing communication IC, belongs to public technology, and the present invention does not do too much explanation.
Claims (8)
1. a photovoltaic battery panel group string Voltage Stability Control structure, is characterized in that: at least include: the first photovoltaic battery panel (1), the second photovoltaic battery panel (2), N photovoltaic battery panel (3); Respectively the first photovoltaic battery panel (1), the second photovoltaic battery panel (2), N photovoltaic battery panel (3) outfan be sequentially connected electrically the first DC to DC converter (4), the second DC to DC converter (5), N DC to DC converter (6); First DC to DC converter (4), the second DC to DC converter (5), N DC to DC converter (6) positive and negative electrode adopt and be sequentially connected in series electrical connection and carry out voltage output; The first photovoltaic battery array (9) is constituted by the first photovoltaic battery panel (1), the second photovoltaic battery panel (2), N photovoltaic battery panel (3), the first DC to DC converter (4), the second DC to DC converter (5), N DC to DC converter (6), respectively by the first photovoltaic battery array (9), the second photovoltaic battery array (10), N photovoltaic battery array (11) voltage output end parallel connection electrically connect with the input of inverter (7), the outfan of inverter (7) electrically connects with electrical network (8).
2. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 1, is characterized in that: described the first photovoltaic battery array (9), the second photovoltaic battery array (10), N photovoltaic battery array (11) have identical circuit structure.
3. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 2, it is characterized in that: described the first photovoltaic battery array (9), second photovoltaic battery array (10), N photovoltaic battery array (11) includes a control circuit respectively, telecommunication circuit and outfan control circuit, control circuit obtains the first DC to DC converter (4) in self photovoltaic battery array by telecommunication circuit, second DC to DC converter (5), the voltage signal of N DC to DC converter (6), when the 30% of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array exports, the control circuit short circuit of control circuit control output end.
4. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 2, it is characterized in that: described the first photovoltaic battery array (9), second photovoltaic battery array (10), N photovoltaic battery array (11) includes a control circuit respectively, telecommunication circuit and outfan control circuit, control circuit obtains the first DC to DC converter (4) in self photovoltaic battery array by telecommunication circuit, second DC to DC converter (5), the voltage signal of N DC to DC converter (6), when the 70% of the minimum amount of voltage that other DC to DC converter during self output voltage is lower than self photovoltaic battery array on average exports, the control circuit short circuit of control circuit control output end.
5. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 3 or 4, is characterized in that: described control circuit is the single-chip microcomputer with A/D input.
6. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 3 or 4, it is characterized in that: described outfan control circuit at least includes two switches, first switch series is connected on positive pole output loop or the negative pole output loop of DC to DC converter;Second switch is attempted by the outfan of DC to DC converter, and when first switch is in off-state, second switch is in short-circuit condition, when after first switch response, after a delay time, and second switch response.
7. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 6, is characterized in that: first described switch and second switch are relays.
8. a kind of photovoltaic battery panel group string Voltage Stability Control structure according to claim 6, is characterized in that: first described switch and second switch are MOS switch pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610129150.1A CN105656082A (en) | 2016-03-08 | 2016-03-08 | Voltage stabilization control structure for photovoltaic cell panel set |
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| CN201610129150.1A CN105656082A (en) | 2016-03-08 | 2016-03-08 | Voltage stabilization control structure for photovoltaic cell panel set |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107707039A (en) * | 2017-11-06 | 2018-02-16 | 浙江工业大学 | Photovoltaic team control array receiver for laser far-distance wireless charging |
| CN108767842A (en) * | 2018-07-02 | 2018-11-06 | 台州航宁制冷设备有限公司 | A kind of direct-flow air conditioner power supply system of photovoltaic and electrical network complementation |
| CN117239742A (en) * | 2023-11-14 | 2023-12-15 | 成都量芯集成科技有限公司 | Photovoltaic array global reconstruction device and method based on improved ant colony algorithm |
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Effective date of registration: 20180419 Address after: 710071 A2103 room, Xinhui building, 33 Gaoxin Road, Xi'an hi tech Zone, Shaanxi Applicant after: Xi'an Mingdu High Energy Technology Co. Ltd. Address before: Taibai Road Shaanxi Yanta District 710071 city of Xi'an province No. 2 Applicant before: Bai Chong |
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Application publication date: 20160608 |