CN106953591B - Photovoltaic power station power generation increasing structure and power generation increasing method thereof - Google Patents
Photovoltaic power station power generation increasing structure and power generation increasing method thereof Download PDFInfo
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- CN106953591B CN106953591B CN201710168505.2A CN201710168505A CN106953591B CN 106953591 B CN106953591 B CN 106953591B CN 201710168505 A CN201710168505 A CN 201710168505A CN 106953591 B CN106953591 B CN 106953591B
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- 238000010248 power generation Methods 0.000 title claims abstract description 35
- 230000001965 increasing effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002910 structure generation Methods 0.000 title description 2
- 238000003491 array Methods 0.000 claims abstract description 21
- 230000005611 electricity Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
-
- 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
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- Photovoltaic Devices (AREA)
Abstract
The invention provides a photovoltaic power station power generation increasing structure and a power generation increasing method thereof, which can obviously reduce the power consumption of a photovoltaic power station, improve the integral power generation amount of the photovoltaic power station and increase the income of photovoltaic thermoelectric enterprises. Dividing the east-west photovoltaic array into three areas according to the normal direction angle of the plane in which the photovoltaic array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area; dividing the north-south photovoltaic array into three areas according to the normal direction angle of the plane in which the array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area; the photovoltaic arrays with the same normal direction angle of the plane are electrically connected with the same junction box after being connected in parallel, and the air switch is arranged between the junction box and the inverter; the photovoltaic arrays with different normal orientation angles of the planes are not electrically connected with the same junction box.
Description
Technical Field
The invention relates to a photovoltaic power station power generation increasing structure and a power generation increasing method thereof, and belongs to the field of photovoltaic power generator sets.
Background
At present, a large number of photovoltaic power stations are built at geographical conditions of uneven terrain such as mountain land, hills and plateaus, and the plane angles of the photovoltaic arrays are changeable, so that sunlight irradiates all the photovoltaic arrays step by step. The photovoltaic array structure in the prior art is shown in fig. 1, the photovoltaic group strings are connected according to the distance according to the geographic position, the photovoltaic array irradiated by sunlight at a certain moment generates electricity, the photovoltaic array not irradiated by sunlight not only does not generate electricity but also consumes the electricity generated by the photovoltaic array generating electricity (the electricity is consumed by resistors connected in a circuit in series or is reversely supplied to the electricity which is consumed by the photovoltaic array not generating electricity), so that the electricity generation capacity of the whole photovoltaic power station is greatly reduced, and geographic conditions of uneven land such as mountain land, hilly land and highland are required to consume a large amount of initial investment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a photovoltaic power station electricity generation increasing structure with reasonable structural design and an electricity generation increasing method thereof, which can obviously reduce the power consumption of the photovoltaic power station, improve the integral power generation of the photovoltaic power station and increase the income of photovoltaic thermoelectric enterprises.
The invention solves the problems by adopting the following technical scheme: the utility model provides a photovoltaic power plant increases power generation amount structure, includes photovoltaic array, connecting wire, collection flow box and dc-to-ac converter; the photovoltaic array comprises a plurality of photovoltaic group strings which are sequentially connected in series; the photovoltaic array is electrically connected with the junction box; the junction box is electrically connected with the inverter;
the method is characterized in that: the air switch is also included; the angles of the photovoltaic group strings in the same photovoltaic array are the same;
(1) According to the normal direction of the plane of the photovoltaic array, the superposition of the normal and the east horizontal is 0 degrees, the superposition of the normal and the west horizontal is 180 degrees, and the angle of the normal direction of the plane of the east-west photovoltaic array is 0-180 degrees; dividing the east-west photovoltaic array into three areas according to the normal direction angle of the plane in which the photovoltaic array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area;
(2) According to the normal direction of the plane of the photovoltaic array, the superposition of the normal and the north direction is 0 degree, the superposition of the normal and the north direction is 180 degrees, and the angle of the normal direction of the plane of the photovoltaic array in the south-north direction is 0 degree to 180 degrees; dividing the north-south photovoltaic array into three areas according to the normal direction angle of the plane in which the array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area;
the photovoltaic arrays with the same normal direction angle of the plane are electrically connected with the same junction box after being connected in parallel, and the air switch is arranged between the junction box and the inverter; the photovoltaic arrays with different normal orientation angles of the planes are not electrically connected with the same junction box.
The angle of the normal direction of the plane of the east-west photovoltaic array is one of the following angles: 0 °,60 °,120 °, 180 °.
The angle of the normal direction of the plane of the north-south photovoltaic array is one of the following angles: 0 °,60 °,120 °, 180 °.
The utility model provides a photovoltaic power plant increases power generation structure's increase power generation method which characterized in that:
(1) The time is between the point A and the point B, and the photovoltaic array air switch in the area of 0 DEG to 120 DEG in east-west direction is automatically switched on; the time is between C point and D point, and the photovoltaic array air switch in the region of 0 DEG to 180 DEG in east-west direction is automatically switched on; the time is between E and F, the photovoltaic array air switch in the region of 60 to 180 degrees in east-west direction is automatically switched on, and the photovoltaic array air switch in the region of 0 to 60 degrees in east-west direction is automatically switched off; judging the power generation and reverse charging conditions between photovoltaic arrays in three areas divided into 0-180 degrees in the north and south directions through an ammeter and a voltmeter in a combiner box or an inverter, and feeding back corresponding air switches for switching on and off according to the current direction;
(2) The time is between the A 'point and the B' point, and the photovoltaic array air switch in the region of 0 DEG to 120 DEG in the north-south direction is automatically switched on; the time is between C 'and D' and the photovoltaic array air switch in the region of 0 DEG to 180 DEG in the north-south direction is automatically switched on; the time is between E 'and F', the photovoltaic array air switch in the region of 60 DEG to 180 DEG in the north-south direction is automatically switched on, and the photovoltaic array air switch in the region of 0 DEG to 60 DEG in the south-north direction is automatically switched off; and judging the power generation and reverse charging conditions between photovoltaic arrays divided into three areas of 0-180 degrees in east-west direction through an ammeter and a voltmeter in a combiner box or an inverter, and feeding back corresponding air switches for switching on and off according to the current direction.
Compared with the prior art, the invention has the following advantages and effects:
1. the original photovoltaic arrays which are connected in a far-near mode according to the geographic position are changed into the photovoltaic arrays which are classified according to the normal direction angles of the planes, the wiring mode is changed, the power generation quantity is increased, and the initial investment is greatly reduced.
2. The photovoltaic arrays with the same angle irradiated by sunlight at a certain moment can be connected into the junction box together to generate power by closing the air switch, and the photovoltaic arrays which cannot be irradiated by sunlight at the moment are temporarily isolated from the photovoltaic power generation system by switching off the air switch, so that invalid power transmission consumption on a wire mesh at the junction box and the inverter of the photovoltaic power generation is eliminated, and the generated power is prevented from being consumed by the photovoltaic power station, so that the power generation increasing effect of the method is very obvious.
3. On the basis of the structure, the photovoltaic power generation system can automatically control along a time axis according to daily sunlight changes, corrects the daily automatic control time point according to the change of different insolation in seasons, and draws an annual time point control curve chart on the basis of annual data.
4. The service life of the photovoltaic module can be prolonged.
Drawings
Fig. 1 is a schematic diagram of a prior art structure.
Fig. 2 is a schematic structural view of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a solar power generation curve of a photovoltaic power station.
Detailed Description
The invention is described in further detail below by way of examples with reference to the accompanying drawings.
Referring to fig. 1 to 3, an embodiment of the present invention includes a photovoltaic array, connection lines 2, a junction box 3, an air switch 4, and an inverter.
The photovoltaic array comprises a plurality of photovoltaic group strings 1, the photovoltaic group strings 1 are sequentially connected in series through connecting wires 2, and the angles of the photovoltaic group strings 1 in the same photovoltaic array are the same.
(1) According to the normal direction of the plane of the photovoltaic array, the superposition of the normal and the east horizontal is 0 degrees, the superposition of the normal and the west horizontal is 180 degrees, and the angle of the normal direction of the plane of the east-west photovoltaic array is 0-180 degrees; dividing the east-west photovoltaic array into three areas according to the normal direction angle of the plane in which the photovoltaic array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area;
in this embodiment, the angle of the normal direction of the plane in which the photovoltaic array in the east-west direction is located is one of the following angles: 0 °,60 °,120 °, 180 °;
(2) According to the normal direction of the plane of the photovoltaic array, the superposition of the normal and the north direction is 0 degree, the superposition of the normal and the north direction is 180 degrees, and the angle of the normal direction of the plane of the photovoltaic array in the south-north direction is 0 degree to 180 degrees; dividing the north-south photovoltaic array into three areas according to the normal direction angle of the plane in which the array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area;
in this embodiment, the angle of the normal direction of the plane where the north-south photovoltaic array is located is one of the following angles: 0 °,60 °,120 °, 180 °.
In the solar photovoltaic power generation system, in order to reduce the use of the wiring between the photovoltaic string 1 and the inverter to the junction box 3.
The photovoltaic arrays with the same normal direction angle of the plane are connected in parallel and then are electrically connected with the same combiner box 3, the combiner box 3 is electrically connected with the inverter, and the air switch 4 is arranged between the combiner box 3 and the inverter. The photovoltaic arrays having different normal orientation angles of the planes are not electrically connected to the same junction box 3.
The photovoltaic string 1 (either a crystalline silicon photovoltaic module for ground or a thin film photovoltaic module for ground) performs both photoelectric conversion and power transmission functions.
The current direction is distinguished by taking the ammeter and voltmeter in the combiner box 3 or the inverter as the adjustment feedback, and judging whether the photovoltaic array connected with the photovoltaic array generates electricity or consumes electricity.
In the embodiment, a test photovoltaic power station system comprises 18 photovoltaic array areas, 256 photovoltaic strings 1 in one area, 173 photovoltaic strings 1 in two areas, 267 photovoltaic strings 1 in three areas, 180 photovoltaic strings 1 in four areas, 180 photovoltaic strings 1 in five areas, 180 photovoltaic strings 1 in six areas, 181 photovoltaic strings 1 in seven areas, 185 photovoltaic strings 1 in eight areas, 180 photovoltaic strings 1 in nine areas, 180 photovoltaic strings 1 in ten areas, 156 photovoltaic strings 1 in eleven areas, 176 photovoltaic strings 1 in twelve areas, 188 photovoltaic strings 1 in thirteen areas, 192 photovoltaic strings 1 in fourteen areas, 238 photovoltaic strings 1 in fifteen areas, 188 photovoltaic strings 1 in sixteen areas, 180 photovoltaic strings 1 in seventeen areas, 165 photovoltaic strings 1 in eighteen areas, 3445 photovoltaic strings 1 in total, and capacity 20.84225MW. Many photovoltaic strings 1 of the original photovoltaic array are connected in parallel to a combiner box 3 or an inverter, wherein the normal direction of many strings is oriented in the forward southeast direction and the normal direction of some strings is oriented in the forward southwest (or other directions) due to the topography condition. In the case of the photovoltaic string 1 oriented in the southwest (or other direction) during normal power generation, the string oriented in the southwest is actually charged in reverse for the generated string. The eight-area photovoltaic array area of the test photovoltaic power station system counts 180 photovoltaic group strings 1, wherein 60 group string normals face forward southeast, a large amount of electric energy is consumed during reverse charging, each group string has 22 components, each component has a resistance of 0.8Ω, and the maximum charging current of the group string is 8.79A.
The internal consumption power calculation formula:
P=I×R 2
wherein:
p- - - -internal power consumption
I- -maximum power current of string
R-internal resistance of component
Testing the internal power consumption of eight photovoltaic array areas of the photovoltaic power station system:
P=8.79×(0.8×22) 2 =2722.790w
P total (S) =P×60=2722.790×60=163.367kw
Photovoltaic power station internal power consumption = P Total (S) ×20=163.367×20=3267.34kw
The modified system eliminates the internal power consumption of the photovoltaic array.
The solar power generation curve shape of the photovoltaic power station can be changed, and tide impact on a power grid is reduced. The solar power generation curve of the photovoltaic power station is shown in figure 3. The solar inclination angle of the photovoltaic power station is large at 6 to 10 and 16 to 20, and the internal consumption proportion of the power station is larger, so that the slopes at the two ends of the curve are larger; the invention increases the electric quantity at the two ends of the curve, so that the curve becomes gentle and the tide impact on the power grid is reduced.
A power generation increasing method of a power generation increasing structure of a photovoltaic power station comprises the following steps:
(1) The time is between the point A and the point B, and the photovoltaic array air switch 4 in the area of 0-120 degrees in east-west direction is automatically switched on; the time is between C point and D point, and the photovoltaic array air switch 4 in the region of 0-180 degrees in east-west direction is automatically switched on; the time is between E and F, the photovoltaic array air switch 4 in the region of 60 to 180 degrees in east-west direction is automatically switched on, and the photovoltaic array air switch 4 in the region of 0 to 60 degrees in east-west direction is automatically switched off; judging the power generation and reverse charging conditions between photovoltaic arrays in three areas divided into 0-180 degrees in the north-south direction through an ammeter and a voltmeter in the combiner box 3 or an inverter, and feeding back corresponding air switches 4 for switching on and off according to the current direction;
(2) The time is between the A 'point and the B' point, and the photovoltaic array air switch 4 in the area of 0-120 DEG in the north-south direction is automatically switched on; the time is between the C 'point and the D' point, and the photovoltaic array air switch 4 in the region of 0 DEG to 180 DEG in the north-south direction is automatically switched on; the time is between E 'and F', the photovoltaic array air switch 4 in the region of 60 DEG to 180 DEG in the north-south direction is automatically switched on, and the photovoltaic array air switch 4 in the region of 0 DEG to 60 DEG in the north-south direction is automatically switched off; and the electricity generation and reverse charging conditions between the photovoltaic arrays in three areas divided into 0-180 degrees in east-west direction are judged through an ammeter and a voltmeter in the combiner box 3 or the inverter, and corresponding air switches 4 are switched on and off according to current direction feedback.
The time point in the method can be set according to specific places, such as:
the air switch 4 of the photovoltaic array in the area of 0-120 degrees in east-west direction is automatically switched on at the time of 5-10 o' clock; the time is between 10 and 16 o' clock, and the photovoltaic array air 4 switch in the area of 0 to 180 degrees in east-west direction is automatically switched on; the time is between 16 and 21 o' clock, the photovoltaic array air switch 4 in the region of 60 to 180 degrees in the east-west direction is automatically switched on, and the photovoltaic array air switch in the region of 0 to 60 degrees in the east-west direction is automatically switched off; the power generation and reverse charging conditions between the photovoltaic arrays divided into three areas of 0 DEG to 180 DEG in the north and south directions are judged through an ammeter and a voltmeter in the combiner box 3 or the inverter, and the automatic opening and closing air switch 4 is fed back according to the current direction.
The automatic opening and closing of the air switch 4 can be partly switched to manual control.
The foregoing in the description is only illustrative of the structure of the invention; moreover, the names of the parts of the present invention may be different, and all equivalent or simple changes of the structure, features and principles described in the conception of the present invention are included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a photovoltaic power plant increases power generation structure's increase power generation method which characterized in that: the photovoltaic power station power generation increasing structure comprises a photovoltaic array, connecting wires, a combiner box, an inverter and an air switch; the photovoltaic array comprises a plurality of photovoltaic group strings which are sequentially connected in series; the photovoltaic array is electrically connected with the junction box; the junction box is electrically connected with the inverter;
the angles of the photovoltaic group strings in the same photovoltaic array are the same;
(1) According to the normal direction of the plane of the photovoltaic array, the superposition of the normal and the east horizontal is 0 degrees, the superposition of the normal and the west horizontal is 180 degrees, and the angle of the normal direction of the plane of the east-west photovoltaic array is 0-180 degrees; dividing the east-west photovoltaic array into three areas according to the normal direction angle of the plane in which the photovoltaic array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area;
(2) According to the normal direction of the plane of the photovoltaic array, the superposition of the normal and the north direction is 0 degree, the superposition of the normal and the north direction is 180 degrees, and the angle of the normal direction of the plane of the photovoltaic array in the south-north direction is 0 degree to 180 degrees; dividing the north-south photovoltaic array into three areas according to the normal direction angle of the plane in which the array is positioned: 0-60 degrees is an area, 60-120 degrees is an area, and 120-180 degrees is an area;
the photovoltaic arrays with the same normal direction angle of the plane are electrically connected with the same junction box after being connected in parallel, and the air switch is arranged between the junction box and the inverter; the photovoltaic arrays with different normal direction angles of the planes are not electrically connected with the same junction box;
the method for increasing the power generation amount comprises the following steps:
(1) The time is between the point A and the point B, and the photovoltaic array air switch in the area of 0 DEG to 120 DEG in east-west direction is automatically switched on; the time is between C point and D point, and the photovoltaic array air switch in the region of 0 DEG to 180 DEG in east-west direction is automatically switched on; the time is between E and F, the photovoltaic array air switch in the region of 60 to 180 degrees in east-west direction is automatically switched on, and the photovoltaic array air switch in the region of 0 to 60 degrees in east-west direction is automatically switched off; judging the power generation and reverse charging conditions between photovoltaic arrays in three areas divided into 0-180 degrees in the north and south directions through an ammeter and a voltmeter in a combiner box or an inverter, and feeding back corresponding air switches for switching on and off according to the current direction;
(2) The time is between the A 'point and the B' point, and the photovoltaic array air switch in the region of 0 DEG to 120 DEG in the north-south direction is automatically switched on; the time is between C 'and D' and the photovoltaic array air switch in the region of 0 DEG to 180 DEG in the north-south direction is automatically switched on; the time is between E 'and F', the photovoltaic array air switch in the region of 60 DEG to 180 DEG in the north-south direction is automatically switched on, and the photovoltaic array air switch in the region of 0 DEG to 60 DEG in the south-north direction is automatically switched off; and judging the power generation and reverse charging conditions between photovoltaic arrays divided into three areas of 0-180 degrees in east-west direction through an ammeter and a voltmeter in a combiner box or an inverter, and feeding back corresponding air switches for switching on and off according to the current direction.
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| CN111404198B (en) * | 2020-04-17 | 2023-04-28 | 中广核乌海新能源有限公司 | Method for improving generating capacity of multi-path photovoltaic MPPT inverter in mountain area |
| CN116742716A (en) * | 2023-06-13 | 2023-09-12 | 安徽华晟新能源科技有限公司 | Photovoltaic power station output power adjusting method and device and computer equipment |
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| Title |
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| "山地光伏电站阴坡利用方式研究";王庆伟 等;《太阳能》;第第9卷卷;第25-27页 * |
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| CN106953591A (en) | 2017-07-14 |
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