CN114531100A - Single-axis angle tracking method and system of intelligent photovoltaic module - Google Patents
Single-axis angle tracking method and system of intelligent photovoltaic module Download PDFInfo
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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
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
- H02S20/32—Supporting structures being movable or adjustable, e.g. for angle adjustment specially adapted for solar tracking
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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
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a single-shaft angle tracking method and a system of an intelligent photovoltaic assembly, which relate to the field of automatic sun tracking of a support of photovoltaic power generation, and comprise a photovoltaic assembly with a plurality of battery units and a power optimizer, a single-shaft tracking support and a tracking control module, so that the back shadow and the front and back row shadow of a single battery unit are consistent, the mutual influence of the shadow sheltered among the battery units is avoided, a power optimizer enables the assembly to operate at the maximum power, the parameters of the assembly are shared in the tracking control module, the single-shaft tracking support is adjusted and controlled by the optimal tracking angle on the basis of an astronomical algorithm by utilizing the electrical parameter information of the power optimizer, the influence of the shadow sheltered on the power is reduced, the optimal irradiation amount of the sunlight incident angle is obtained, the optimal photovoltaic power generation power is obtained, and a single-shaft tracking system can be effectively equipped in a large photovoltaic power station, the purpose of greatly reducing the cost of the leveling degree is achieved.
Description
Technical Field
The invention relates to the field of automatic sun tracking of supports for photovoltaic power generation, in particular to a single-axis angle tracking method and a single-axis angle tracking system for an intelligent photovoltaic module, which have functions of a belt module and a substring-level power optimizer.
Background
The mounting bracket structure of the photovoltaic power station can be roughly divided into an optimal inclination angle fixed type, a sun tracking type and a fixed adjustable type. The automatic sun-tracking system for the solar photovoltaic array can adjust the orientation of the components and track the movement of the sun in real time, so that sunlight directly irradiates the photovoltaic array, the solar radiation quantity received by the photovoltaic array is increased, and the total power generation quantity of the solar photovoltaic power generation system is improved. Sun tracking is classified into flat single-axis tracking, oblique single-axis tracking, and dual-axis tracking. In particular, the horizontal single-shaft tracking support system rotates along the north-south axis in the east-west direction, and in other aspects, the inclined single-shaft tracking support system can be inclined at the horizontal installation latitude to further enable the assemblies to face the sun, but the inclined single shaft can also reduce the number of the assemblies of the unit support; the double-shaft tracking bracket system can track the sun in a longitude and latitude adjusting mode, but is high in installation and maintenance cost. Therefore, the single-shaft tracking support system is widely applied by the characteristics of simple and practical structure and obvious power generation gain.
However, the incident angle of the sun is narrow in the morning and evening, the problem of shielding of the photovoltaic module with the adjacent support is solved, the problem of shielding can be reduced by increasing the distance between the adjacent supports, and the occupied area of the photovoltaic power station can be increased. In addition, for a two-sided photovoltaic power generation system, the illumination non-uniformity of the back side is affected by the self-shadowing of the front and back rows of photovoltaic modules and the left and right adjacent modules. Thus, how to achieve the maximum irradiation tracking of the assembly by tracking the stent under the set spacing requirement becomes a problem to be solved. The prior art is widely applied to large photovoltaic power stations about flat single-axis photovoltaic systems, and has a lot of researches about tracking methods of flat single axes, and a lot of documents are about researches on the aspect of relation between component shielding and flat single-axis power generation.
The first document entitled "method for optimizing a flat uniaxial trajectory based on component shielding power loss", written in publication "power technology" 2016, 40 (7): 1446-. The literature discloses a method for calculating the movement track of the sun, when the solar altitude angle is small, if the component is kept perpendicular to the sun light, the cell is shielded, and the system needs to adjust the angle to make the component in the optimal shielding state. In the literature, it is found that when the single cell of the assembly is shaded by 0% -10%, the power loss of the assembly is very small. If shielded lO%, the assembly loses 1.2% of its power, and thus annual energy production can be improved by calculating the optimal shielding ratio.
Document two, entitled "study of the effect of local shadow masking on large grid-connected photovoltaic power stations", the authors chengyusau, li jiangquan, wu xiao cloud and zhu vingjie, published in publication "high power conversion technology" 2014 (5): 49-53, in which the influence of local shadow masking on the photovoltaic plant is introduced. The second document shows that when the illuminance of one of the series-connected photovoltaic cells is reduced due to shading or the like, the current of the whole series-connected photovoltaic cell is reduced, and the working voltage of the other series-connected photovoltaic cells is not at the working voltage of the maximum power, and the shaded photovoltaic cells consume the heat generated by the other cells in the string as a load, so that the hot spot phenomenon is generated. Moreover, the cell string under the local shadow condition has a multi-peak characteristic, and is difficult to work at the maximum power point even if a power optimizer is used, so that the loss of the generated energy is caused.
In summary, the tracking method adopted by the conventional flat single-axis system mainly utilizes an astronomical algorithm to track the sight day track and is matched with a tilt sensor tracking mode. The astronomical algorithm tracking method for the apparent day track has two tracking modes of completely tracking without considering shadow shielding and turning the shadow by a certain angle, wherein the former can cause the assembly to have shadow shielding with a larger proportion to cause power loss of the photovoltaic array, and the latter can cause the incidence angle of the system to be too large to cause the photovoltaic array not to be in the maximum power generation state.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a single-axis angle tracking method and a single-axis angle tracking system for an intelligent photovoltaic module, which can automatically determine a proper shadow shielding proportion and a proper sun incidence angle, improve the power generation gain of a flat single-axis photovoltaic power generation system and reduce the power consumption cost (LCOE) of the photovoltaic system.
In one aspect, the invention provides a single-axis angle tracking method for an intelligent photovoltaic module, which is applied to a photovoltaic power generation system capable of angle tracking, wherein the photovoltaic power generation system comprises at least one single-axis tracking support, a plurality of photovoltaic modules are mounted on the single-axis tracking support in the row direction, each photovoltaic module comprises at least two battery units which are formed by connecting battery pieces packaged in the photovoltaic modules in series/parallel and distributed in the column direction, the battery units are connected with power optimizers, and the power optimizers are connected in series and used as the output ends of the photovoltaic modules; the angle tracking method comprises the following steps:
calculating according to a preset astronomical algorithm to obtain a tracking angle reference value Ac;
collecting electrical parameter information of a power optimizer on the single-axis tracking support;
on the basis of the current tracking angle reference value Ac, the optimal angle is adjusted to the maximum extent according to the obtained electrical parameter information so as to meet the generated energy, and the single-shaft tracking support is controlled to operate at the optimal tracking angle A;
and when the change of the electrical parameter information exceeds the preset requirement, the current optimal tracking angle A is obtained again.
Preferably, in the single-axis angle tracking method for an intelligent photovoltaic module, the angle tracking method for the electrical parameter information of the power optimizer includes:
acquiring power information of power optimizers on the single-axis tracking support, and acquiring the total power of each power optimizer;
adjusting the tracking angle of the single-shaft tracking support at a preset small angle according to the initial value Ac of the tracking angle, comparing the total power difference of the power optimizer before and after the tracking angle is adjusted, judging whether the tracking angle is further adjusted until the small angle adjustment is accumulated to maximize the total power of the power optimizer, and controlling the single-shaft tracking support to operate at the current optimal tracking angle A;
and when the total power change of the collected power optimizer exceeds a preset condition, the current optimal tracking angle A is obtained again.
Preferably, in the single-axis angle tracking method of the intelligent photovoltaic module, the photovoltaic module is a double-sided power generation module; the method for angle tracking of electrical parameter information by a power optimizer includes:
collecting power information of a power optimizer on the single-axis tracking support;
adjusting the tracking angle of the single-shaft tracking support at a preset small angle according to the initial value Ac of the tracking angle;
comparing the power difference of the power optimizer in the column direction before and after the tracking angle is adjusted, and judging whether to adjust the tracking angle further until the power difference of the current tracking angle in the column direction meets the preset requirement, so that the tracking angle is optimized A;
and when the difference of the power in the row direction of the collected power optimizer exceeds a preset condition, the current optimal tracking angle A is obtained again.
Preferably, in the single-axis angle tracking method of the intelligent photovoltaic module, the photovoltaic module is a double-sided power generation module; the angle tracking method further includes:
collecting meteorological data information, and judging an operation mode for controlling the single-axis tracking support;
and if the weather mode is a sunny mode, judging the stage, controlling the single-axis tracking support to operate at an astronomical tracking angle Ac regulated by the optimized angle S, and determining the optimal tracking angle.
If the tracking angle is in the early and late stages, determining the optimal tracking angle according to the total power information change of the power optimizer on the astronomical tracking angle A;
and if the tracking angle is at the noon and the early and late stages and on the astronomical tracking angle A, determining the optimal tracking angle according to the change of the power information of the power optimizer in the column direction.
Preferably, in the above method for tracking an angle of a single axis of an intelligent photovoltaic module, the operation mode of the single axis tracking support further includes:
if the weather mode is the cloudy/rainy day mode, controlling the fixed angle of the single-axis tracking support at the horizontal position and the position near the horizontal position to be fixed;
and if the weather mode is a cloudy mode, controlling the single-shaft tracking support to operate at an astronomical tracking angle Ac.
In another aspect, the present invention provides a single-axis angle tracking system for an intelligent photovoltaic module, the angle tracking system comprising: the tracking control device comprises a photovoltaic assembly, a single-shaft tracking support and a tracking control module;
the photovoltaic module is formed by arranging and packaging battery pieces in a rectangular array, the battery pieces with equal areas are connected to form at least two battery units, each battery unit comprises a plurality of battery piece strings formed by mutually connecting the battery pieces which are arranged in rows in the direction of the short side of a rectangle in series, the rectangular long side directions of the battery piece strings are arranged and mutually connected in series and/or in parallel to form the output end of the battery unit, the output end of the battery unit is connected with the input end of a power optimizer, and the output ends of the power optimizers are connected in series and are used as the output end of the photovoltaic module;
the single-shaft tracking support is vertically provided with a plurality of photovoltaic modules along the long side of the rectangle in the row direction, and is connected with and controlled by the tracking control module;
the tracking control module calculates a tracking angle reference value Ac through a preset astronomical algorithm, collects electric parameter information of a power optimizer on the single-shaft tracking support, and controls the single-shaft tracking support to operate at an optimal tracking angle A according to the electric parameter information on the adjustment of the reference value Ac.
Preferably, in the above-mentioned single-axis angle tracking system of intelligent photovoltaic module, the tracking control module includes: the system comprises an astronomical processing unit, an optimizer acquisition unit, an optimization control unit and a tracking judgment unit;
the astronomical processing unit calculates an initial value Ac of the tracking angle according to a preset astronomical algorithm;
the optimizer acquisition unit acquires power information of the power optimizers on the single-axis tracking support and acquires the total power of each power optimizer;
the optimization control unit adjusts the tracking angle of the single-shaft tracking support at a preset small angle according to the initial value Ac of the tracking angle, compares the total power difference of the power optimizer before and after the tracking angle is adjusted, judges whether the tracking angle is further adjusted until the small angle adjustment is accumulated to maximize the total power of the power optimizer, and controls the single-shaft tracking support to operate at the current optimal tracking angle A;
and the tracking judgment unit judges whether the total power change of the power optimizer exceeds a preset condition or not so as to maintain the single-shaft tracking support to operate at the optimal tracking angle A.
Preferably, in the above-mentioned single-axis angle tracking system of intelligent photovoltaic module, the tracking control module includes: the system comprises an astronomical processing unit, an optimizer acquisition unit, an optimization control unit and a tracking judgment unit;
the astronomical processing unit calculates an initial value Ac of the tracking angle according to a preset astronomical algorithm;
the optimizer acquisition unit acquires power information of the power optimizer on the single-axis tracking support and obtains the power difference of the power optimizer in the column direction;
and the optimization control unit adjusts the tracking angle of the single-axis tracking support at a preset small angle according to the initial value Ac of the tracking angle, compares the power difference of the power optimizer in the column direction before and after the tracking angle is adjusted, and judges whether to further adjust the tracking angle until the power difference of the current tracking angle in the column direction meets the preset requirement, so that the tracking angle is optimized A.
And the tracking judgment unit compares and judges whether the difference change of the power information of each power optimizer in the column direction before and after adjustment exceeds a preset requirement or not so as to maintain the single-axis tracking support to operate at the optimal tracking angle A.
Preferably, in the above-mentioned single-axis angle tracking system of intelligent photovoltaic module, the tracking control module further includes: the weather monitoring system comprises a mode judging unit and a weather obtaining unit;
the weather obtaining unit is used for obtaining weather data information;
the mode judging unit operates in a corresponding weather mode according to the weather data information;
if the weather mode is a rainy day mode, controlling the single-shaft tracking support to be fixed at a fixed angle of zero degree or close to zero point;
if the weather mode is a cloudy mode, controlling the single-shaft tracking support to operate at an astronomical tracking angle Ac;
if the weather mode is a sunny day mode, judging the operation stage of the single-axis tracking support, and if the weather mode is a morning and evening stage, determining the optimal tracking angle according to the total power information of the power optimizer and the astronomical tracking angle Ac; and if the current tracking angle is at noon and before and after, determining the optimal tracking angle according to the power information difference of the power optimizer in the column direction and the astronomical tracking angle Ac.
Preferably, in the single-axis angle tracking system of the intelligent photovoltaic module, some of the battery cell strings are connected in parallel with each other in the same polarity orientation to form a first string group, another part of the battery cell strings in the same number are connected in parallel with each other in the opposite polarity orientation to form a second string group, the first string group and the second string group are connected in series with each other, and both ends of the series connection are connected to the power optimizer; the battery piece strings with the same polarity are adjacently arranged, or the battery piece strings with opposite polarities are adjacently arranged; the single-shaft tracking support is provided with at least two rows of photovoltaic modules; the power optimizer is a DC/DC conversion module for tracking the maximum photovoltaic power.
The working principle of the invention is as follows: on one hand, at least two battery units are arranged in the photovoltaic module, each battery unit outputs electric power by tracking the maximum photovoltaic power point through an independent power optimizer, each battery unit is distributed in the column direction, the sheltering shadow generated by the supports in the adjacent rows only shelters one battery unit, the other battery units in the column direction are not sheltered, and the degree of the sheltering shadow is related to the adjustment of the support angle; the back irradiation of the double-sided photovoltaic module is uneven and is distributed on different battery units in a more balanced manner, and the balance degree of the back irradiation is related to the adjustment of the angle of the bracket; on the other hand, the operation of the single-axis tracking support is controlled, on the basis of an astronomical algorithm angle which can enable the angle of the support to change along with the solar altitude angle, the power optimizer electrical parameter information of each photovoltaic module on the support is collected, whether the shadow shielding among support rows occurs or not is judged according to parameters, the power balance of the double-sided photovoltaic modules is balanced, and the support is controlled to operate in a corresponding mode after a proper weather environment is judged.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention installs the photovoltaic component of at least two battery units on a single-shaft tracking bracket, the rectangular array of the battery units is formed by arranging battery pieces in an equal way in the long side direction, each battery unit is formed by transversely connecting the short side direction of a rectangle in series into a battery piece string, each battery unit can track the maximum power point and is controlled by the output of a power optimizer, so that the shadow shading of the back surface in each battery unit is consistent, the shading of the front row and the back row only occurs in one battery unit, each battery unit operates with the optimal power and the stable output voltage under the power optimizer, a tracking control module controls the tracking angle of the single-shaft tracking bracket according to the operating state of the power optimizer, on the basis of an astronomical algorithm, the optimal tracking angle of the single-shaft tracking bracket is integrated, the influence of the shadow shading on the power can be reduced, and the optimal irradiation amount can be obtained by the sunlight incident angle, and then obtain the optimal photovoltaic power generation power, can be equipped with single-axis tracking system in the large-scale photovoltaic power plant effectively, reach the purpose that can reduce the standard degree cost by a wide margin.
(2) The photovoltaic module adopts a structure with multiple battery units, so that the photovoltaic module can be assembled in a longitudinal vertical mode on the long side, the number of purlines on the bracket can be reduced, the number of mounting hole sites can be reduced, and the mounting cost can be greatly reduced; the photovoltaic module also adopts a structure that the cells are arranged on the short side and are connected in series, so that the problem of power loss caused by shielding of the front row and the rear row can be effectively solved, and mismatch loss caused by shielding of local cells, uneven illumination on the back surface, shielding of a cross beam and the like can be effectively solved; the photovoltaic module also adopts double-sided battery pieces, so that the angle control of the tracking control module on the bracket not only considers the shielding of the front row and the rear row, but also considers the uneven irradiation of the back, and the back of the photovoltaic module can obtain more reflected sunlight energy. According to the invention, each photovoltaic module arranged on the single-shaft tracking support adopts a C-shaped series connection mode, so that adjacent photovoltaic modules can be directly connected in series, the length of an output wire is reduced, and the series-connected modules cannot be mismatched under the action of an optimizer to lose the generated energy.
(3) The method comprehensively increases the total irradiation amount of the photovoltaic module of the single-axis tracking support, can calculate the theoretical tracking optimal angle through a new astronomical tracking algorithm, determines the balance between the shielding of the front and back rows of shadows and the irradiation obtained amount of the photovoltaic power generation module, and improves the power generation amount of the photovoltaic power generation module of the flat single-axis tracking system. The problems of uneven shielding of the front row and the back row of a complex uneven terrain and uneven scattering irradiation and earth surface reflection irradiation obtained by power generation on the back surface of a double-sided photovoltaic module can be further solved, the rotation angle of the flat single-shaft support is adjusted and controlled through big data analysis and an intelligent algorithm on the basis of the astronomical algorithm, and the optimal tracking angle of each row of tracking supports in theory is calculated. The invention further judges whether the module is a clear-day module or not by acquiring meteorological data information, and solves the problems of uneven front and back rows of complex and uneven single terrains that the shielding is uneven and the scattering irradiation and the surface reflection irradiation obtained by the back power generation of the double-sided photovoltaic module are uneven in a clear-day mode.
The invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic flow chart of a single axis angle tracking method of the present invention;
FIG. 2 is a schematic diagram of a single axis angle tracking system of the present invention;
FIG. 3 is a schematic diagram of a circuit configuration of a photovoltaic module of the single axis angle tracking system of the present invention;
FIG. 4 is a schematic view of the external structure of a photovoltaic module of the single axis angular tracking system of the present invention;
FIG. 5 is a shadow effect display view of the front and back sides of a photovoltaic module of the single axis angle tracking system of the present invention;
FIG. 6 is a schematic diagram of a power optimizer circuit for a single-axis angle tracking system according to the present invention;
FIG. 7 is a schematic view of a photovoltaic module mounting structure of the single axis angle tracking system of the present invention;
FIG. 8 is a schematic diagram of the tracking control module of the single-axis angle tracking system of the present invention.
Reference numerals: 10. a photovoltaic module; 11. a battery cell; 20. a photovoltaic cell sheet; 21. a string of battery pieces; 221. a first string group; 222. a second string group; 30. a power optimizer; 31. a DC/DC conversion module; 32. a maximum power tracking unit; 33. a pulse width modulation unit; 34. a junction box; 40. a photovoltaic string; 50. a single axis tracking carriage; 60. a tracking control module; 61. a weather collection unit; 62. an optimizer acquisition unit; 63. a weather obtaining unit; 64. a mode judging unit; 65. a tracking judgment unit; 66. an optimization control unit; 70. a weather station.
Detailed Description
To better illustrate the objects, technical solutions and advantages of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in fig. 1 to 8, according to the method and system for tracking a single axis angle of an intelligent photovoltaic module of the embodiment of the present invention, by collecting electrical parameter information of the power optimizer 30, a problem that it is difficult to effectively determine an optimal tracking angle between a shadow shielding ratio influence and a solar altitude angle influence at a tracking angle of the single axis tracking support 50 is solved, and a photovoltaic power generation system obtains a larger generated energy and an electrical parameter in the photovoltaic string 40 is more stable.
It will be appreciated that the single-axis tracking mount 50 may be a flat single-axis or a diagonal single-axis mount with the axis of rotation oriented in the north-south direction, such that rotation of the axis of rotation causes the angle of the photovoltaic module 10 to change in the east-west direction while maintaining tracking of the sun's rays. Taking a flat single-shaft component tracking bracket as an example, the support structure comprises an upright post, a main beam, a purline and the like; including a motor, a rotation reduction gear, and the like.
It is to be understood that "row direction" and "column direction" are convenient descriptions for understanding the technical solution, and should not be construed as necessarily limiting the directions, "row direction" is a direction parallel to the axial direction of the reference uniaxial tracking support 50, and "column direction" is a direction perpendicular to the axial direction of the reference uniaxial tracking support 50. In the general arrangement of a photovoltaic power generation system, it is convenient to understand the principle of the present invention that the "row direction" is the north-south direction, and the "column direction" is the east-west direction.
Single-axis angle tracking method for intelligent photovoltaic module provided in this embodiment
Referring to fig. 1, the method for tracking the single axis angle of the intelligent photovoltaic module comprises the following steps:
s100, weather forecast information (rainy days, cloudy days and sunny days), solar irradiation information (total irradiation/direct irradiation/scattered irradiation), relative humidity, atmospheric environment temperature and the like are obtained through the weather station 70 and the weather acquisition unit 61. And further calculating and obtaining an altitude angle (an angle between the direction of light incidence at a certain point of the earth and the ground plane), an azimuth angle (an angle between a shadow cast by the light rays on the ground and the local meridian), and a vergence angle (a solar vergence angle, namely an angle between a sun-ground center connecting line and an equatorial plane) by obtaining time and longitude and latitude. The longitude, latitude, time zone and local time of a certain place of the earth are known, and the solar altitude and azimuth at the time of the place can be obtained. And combining the atmospheric information to obtain an initial value Ac of the tracking angle corrected by atmospheric refraction.
And S200, distinguishing different weather modes such as rainy days, cloudy days, sunny days and the like according to the current weather condition, and judging and determining the operation mode of the single-axis tracking support 50.
S201, if the tracking control module 60 enters the cloudy mode (or cloudy or rainy), the tracking control module 60 sends an instruction to drive the single-axis tracking bracket 50 to rotate and fix the tracking angle a of the photovoltaic module 10 to zero or a fixed angle close to zero, that is, the photovoltaic module 10 receives light horizontally, and at this time, the tracking control module 60 stops the angle tracking operation.
And S202, if the photovoltaic module enters a multi-cloud mode, the tracking control module 60 sends an instruction to drive the single-shaft tracking support 50 to rotate and enable the tracking angle A of the photovoltaic module 10 to follow the traditional astronomical tracking angle Ac along with time, wherein the astronomical tracking angle Ac is calculated and tracked only from the sun angle without considering inverse tracking.
S203, if the sunny mode is entered, entering stage judgment:
s203a, if the current is at noon and around, the lower area of the back of the photovoltaic module 10 can avoid the self-shadow area, and directly receive the stronger reflected sunlight from the ground, and the obtained illumination is higher; the influence of self-shadow on the middle area of the back is large, the self-shadow mainly depends on the scattering of the sun light by the atmosphere, and the obtained illumination is low; the illumination obtained at the top is between the two, which can obtain strong atmospheric scattering and cloud reflection, and then drive the single-axis tracking bracket 50 to rotate and make the tracking angle a of the photovoltaic module 10.
Tracking algorithm of tracking angle A at current stage: collecting power information of the power optimizer 30 on the single-axis tracking support 50; adjusting the tracking angle of the single-shaft tracking bracket 50 at a preset small angle according to the initial value Ac of the tracking angle; comparing the power difference of the power optimizer 30 in the column direction before and after the tracking angle adjustment, and judging whether to further adjust the tracking angle until the power difference of the current tracking angle in the column direction meets the preset requirement, so that the tracking angle is optimized A; and when the difference of the power in the column direction of the collected power optimizer 30 exceeds a preset condition, the current optimal tracking angle A is obtained again.
More specifically, two rows of photovoltaic modules 10 are disposed in the column direction of the angle tracking bracket (two rows of photovoltaic modules 10 in the column direction), each photovoltaic module 10 is provided with two battery units 11 independently connected to the power optimizer 30, and the battery units 11 are made up of double-sided photovoltaic cells 20, which are divided into first, second, third and fourth rows of battery units 11 in the column direction for easy understanding. In the row direction, the difference between the total power of each first battery cell 11, each second battery cell 11, each third battery cell 11, and each fourth battery cell 11 is within the preset requirement, and then the back irradiation distribution of each battery cell 11 is balanced by adjusting the astronomical tracking angle Ac, so as to stabilize the stability of the output of the bifacial photovoltaic module 10.
It will be appreciated that the algorithm of the difference is various and in one implementation the difference algorithm may be: (Pmax-Pmin)/(Pmax + Pmin), if the result of the algorithm satisfies (Pmax-Pmin)/(Pmax + Pmin) < 1%, it is within the preset requirement. The value of 1% is set according to the specific parameters of the photovoltaic system, weather and other factors. Since the first and second battery units 11 belong to one photovoltaic module 10, the third and fourth battery units 11 belong to another photovoltaic module 10, the photovoltaic modules 10 are connected in series in the row direction, and the two photovoltaic modules 10 in the column direction are not directly connected in series, a method of encoding the address of the power optimizer 30 may be used to acquire the information of the power optimizer 30 and the relationship of the corresponding row, or a method of acquiring the power information of the optimizer according to the row sequence may be used.
S203b, if it is the morning and evening time period when it is about to occur that the photovoltaic module 10 is operating at the astronomical tracking angle Ac, the front photovoltaic module 10 will have a shadow from the other row of modules, and the single-axis tracking bracket 50 is driven to rotate and make the tracking angle a of the photovoltaic module 10.
Tracking algorithm of tracking angle A at current stage: the tracking angle A is obtained by the following method: collecting power information of the power optimizers 30 on the single-axis tracking support 50, and obtaining the total power of each power optimizer 30; adjusting the tracking angle of the single-shaft tracking support 50 at a preset small angle according to the initial value Ac of the tracking angle, comparing the total power difference of the power optimizer 30 before and after the tracking angle is adjusted, judging whether the tracking angle is further adjusted until the small angle adjustment is accumulated to maximize the total power of the power optimizer 30, and controlling the single-shaft tracking support 50 to operate at the current optimal tracking angle A; and when the total power change of the collected power optimizer 30 exceeds a preset condition, the current optimal tracking angle A is obtained again.
It will be appreciated that the algorithm of the difference is varied and can be the total power Pt at the present time and the total power Po at the last time the optimum angle was determined, | (Pt-Po)/(Pt + Po) | < 0.5%. The value of 0.5% is set according to the specific parameters of the photovoltaic system, weather and other factors. The total power may be determined by the sum of the powers of all the power optimizers 30, or may be the total power sampled by the same number of the power optimizers 30 in each row.
More specifically, the total power of each power optimizer 30 before adjustment is obtained, the total power is adjusted in the direction of the rotating shaft of the support by a small angle S on the initial value Ac, if the continuous total power decreases, the small angle S is adjusted on the initial value Ac in another direction, and after the continuous total power increases, the last time is determined to be the optimal tracking angle a under the condition that the total power decreases for the first time. The adjustment of the small angle S may also be performed in a preset total power increase direction to obtain the optimal tracking angle a.
It can be understood that in the angle tracking of the photovoltaic power generation system, the angle tracking method which can only be operated and can solve the shielding problem of the brackets in the adjacent rows in the morning and evening determines the tracking angle A of the maximum power generation amount between the shielding of the adjacent rows and the solar altitude based on the optimization of the total power of the power optimizer 30; the angle tracking method for all-weather operation back surface optimization in a double-sided photovoltaic power generation system can also determine a more stable tracking angle A between back surface irradiation unevenness and front surface solar altitude based on the power difference of a row of optimizers.
It will be appreciated that the electrical quantities of the power optimizers 30 on which the particular tracking is based are varied, and that in a series of power optimizers 30, the optimum tracking angle a can be obtained in a similar manner from the output voltage of the power optimizers 30. The invention is characterized in that the initial value Ac calculated by the astronomical algorithm is used for cooperatively determining the angle tracking of the bracket according to the setting position of the battery unit 11 in the photovoltaic module 10 and the electric parameter of the power optimizer 30.
Referring to fig. 2 to 8, the present invention provides a single-axis angle tracking system of an intelligent photovoltaic module, the angle tracking system includes a photovoltaic module 10, a single-axis tracking support 50 and a tracking control module 60, and at least two battery units 11 are arranged in a column direction of the photovoltaic module 10, each photovoltaic module 10 is rectangular, a long side direction of the rectangle is perpendicular to an axial direction of the support, each battery unit 11 is formed by connecting a plurality of battery strings 21 in a short side direction of the rectangle, the battery units 11 are independently and optimally controlled by a power optimizer 30 to operate in a maximum power tracking manner, and the operation of the single-axis tracking support 50 is controlled by the tracking control module 60 according to electrical parameter information of the power optimizer 30 so as to solve the problems of uneven shading of front and rear rows and uneven back irradiation.
Referring to fig. 2, in the present embodiment, specifically, the photovoltaic module 10 includes two battery units 11, each battery unit 11 is independently connected with a power optimizer 30, and a plurality of photovoltaic modules 10 are connected in series by the power optimizer 30 and form a photovoltaic string 40; the photovoltaic string 40 is vertically mounted on the single-axis tracking bracket 50 with each photovoltaic module 10; a number of single axis tracking carriages 50 are connected and controlled by a tracking control module 60. The tracking control module 60 includes an optimizer collecting unit 62, and acquires data information corresponding to the single-axis tracking bracket 50, the photovoltaic module 10, and the power optimizer 30 via the power collecting unit. The tracking control module 60 also includes a weather acquisition unit 63 and is operable to acquire information from the weather station 70, integrate the weather data information with the power optimizer 30 data information to determine an optimal tracking angle, and send an angle control signal to control the operation of each single-axis tracking bracket 50.
Referring to fig. 3, the present embodiment specifically includes a mode determination unit 64, a weather acquisition unit 63, an astronomical processing unit, an optimizer acquisition unit 62, an optimization control unit 66, and a tracking determination unit 65. The tracking control module 60 further includes: a mode determination unit 64 and a weather pattern acquisition unit 63; a weather obtaining unit 63 for obtaining weather data information; a mode judging unit 64 operating in a corresponding weather mode according to the weather data information; if the weather mode is a rainy day mode, controlling the single-axis tracking bracket 50 to be fixed at a fixed angle of zero degree or close to zero point; if the weather mode is a cloudy mode, controlling the single-axis tracking bracket 50 to operate at an astronomical tracking angle Ac; if the weather mode is a sunny day mode, judging the operation stage of the single-axis tracking support 50, and if the weather mode is a morning and evening stage, determining an optimal tracking angle according to the total power information of the power optimizer 30 and the astronomical tracking angle Ac; and if the current tracking angle is at noon and before and after, determining the optimal tracking angle according to the power information difference of the power optimizer 30 in the column direction and the astronomical tracking angle Ac.
Specifically, referring to fig. 4, the present invention is a circuit structure of a photovoltaic module 10, the photovoltaic module 10 is formed by arranging and packaging battery pieces in a rectangular array, the battery pieces with equal division in area are connected to form two battery units 11, each of the two battery units 11 includes six battery piece strings 21 formed by connecting battery pieces arranged in a row in a rectangular short side direction in an upper area and a lower area in series, each of the six battery piece strings is arranged in a rectangular long side direction and connected in series and/or in parallel to form an output end of the battery unit 11, the output end of the battery unit 11 is connected to an input end of a power optimizer 30, and output ends of the power optimizers 30 are connected in series and used as the output end of the photovoltaic module 10.
More specifically, the battery units 11 in the upper and lower regions have three strings of battery sheet strings 21 connected in parallel with the polarity facing to the left, that is, the positive electrodes of the first string groups 221 connected in parallel with each other in the left direction; the other three battery cell strings 21 are connected in parallel with the polarity facing to the right side, namely, the positive electrode right-direction second string group 222 is connected in parallel with each other; the positive left-direction first string 221 and the positive right-direction second string 222 are connected in series, and two ends of the series are correspondingly connected to the input end of each power optimizer 30. The power optimizers 30 corresponding to the battery units 11 in the upper and lower regions are connected in series with each other as the output end of the photovoltaic module 10. In the present embodiment, for convenience of serial connection, the positive left-direction first string 221 and the positive right-direction second string 222 are respectively three adjacent strings of battery strings 21; in other embodiments, in order to make the string group of two kinds of electrodes oriented to be uniformly distributed, the battery piece string 21 in the left direction of the positive electrode is adjacent to the battery piece string 21 in the right direction of the positive electrode.
Referring to fig. 5, the cell sheet may be single-sided or double-sided photovoltaic power generation. In one aspect, the conversion to electrical energy under the radiation of light can be achieved to increase the reflection efficiency according to the terrain, increasing the power generation by 5% to 20%. Particularly, for double-sided photovoltaic power generation, the angle tracking system optimizes the receiving performance of back irradiation. Any cell string 2121 comprising 12 half cells 20a connected in series by conductive bonding strips reduces the current through each main grid to 1/2, reduces the power dissipation within the half cell assembly to 1/4 of a full cell assembly, and increases the current and reduces the voltage, but reduces the heat dissipation of the cells, relative to a cell string 2121 comprising 6 full cells.
Referring to fig. 6, the photovoltaic module 10 of the above embodiment is exemplary in view of various shading situations, and can be similarly applied to other embodiments.
On the front side of the photovoltaic module 10. The lower rectangular shadow schematically shows the case where the front row blocks the rear row due to a low solar incident angle in the morning and evening. In particular, this shadow is moving over time. In this embodiment, only the lowermost string of battery pieces of the lower area component unit is shielded at the beginning, which is equivalent to one of the six strings of component units being shielded; because the photovoltaic modules are connected in series after being connected in parallel, other five strings are less affected, and the upper area module unit is not affected, the power of the photovoltaic module 10 loses the power of the short-edge string battery piece string 21. If the three lowermost strings are eventually blocked, the module power is lost to about three strings of cell strings 21.
On the back side of the photovoltaic module 10. The progressively increasing shading of the top and bottom schematically represents the difference in the illuminance of the sunlight received at the back of the bifacial photovoltaic module 10. In this embodiment, taking the single-row photovoltaic module 10 as an example, the upper region module unit receives the top strong irradiation and a part of the middle weak irradiation, the lower region module unit receives the other part of the middle weak irradiation and the bottom strong irradiation, and the illuminance received by each cell string 21 is close to each other; in the tracking of the power optimizer 303 to the maximum power point, the photovoltaic modules 10 in the upper and lower regions can operate at voltage positions close to the maximum power point, and the interior of the photovoltaic modules has a parallel structure, so that each string of cell strings 21 can fully convert irradiation into electric energy. The rectangular shadows about the middle part schematically represent the shading of two back supporting purlins in the double-sided photovoltaic module 10. In the present embodiment, only two string short-side cell strings 21 in two assembly units are affected.
Referring to fig. 7, in the embodiments of the present invention, each power optimizer 30 is a Buck-type Buck DC/DC conversion module 31 provided with a maximum power tracking unit 32. In other embodiments, the power optimizer 30 may also be a Boost type, or a Boost-Buck type. The output ends of the power optimizers 30 are connected in series to form the output end of the photovoltaic module 10. The DC/DC conversion module 31 is provided with a master control module which optimizes the electrical parameters of the input and output terminals. Maximum power tracking unit 32, MPPT in the figure. It can track the maximum power point of the battery unit 11 according to the output electrical parameter of the detection power optimizer 30 and control the duty ratio of the power tube in the DC/DC conversion module 31 through the pulse width modulation unit 33, i.e. PWM in the figure.
Referring to fig. 8, the photovoltaic modules 10 of the present embodiment are mounted on a single-axis tracking support 50, and each photovoltaic module 10 is mounted in a vertical manner. Four purlins at the back of the single-axis tracking support 50 can realize the installation of supporting 4 photovoltaic modules 10, and the installation positions of screw holes are less. In the circuit structure of the photovoltaic power generation system of the present embodiment, the power optimizer 30 of each battery unit 11 has its output connected in series as the output of the photovoltaic module 10. The output ends of the photovoltaic modules 10 are sequentially connected in series to form a photovoltaic module string 40, the output end of the photovoltaic module string 40 is connected to the photovoltaic inverter photovoltaic module string 40 directly or through a direct current combiner box and comprises a plurality of photovoltaic modules 10 which are horizontally arranged on the upper rectangular short side and the lower rectangular short side, wherein one end of the upper row structure and the lower row structure is provided with an upper port and a lower port of the photovoltaic module 10 at the end, and the upper port and the lower port of the photovoltaic module 10 at the end are connected in series; the other end of the upper and lower row structures has the upper and lower ports of the photovoltaic module 10 at the end as the output end of the photovoltaic string 40. According to the scheme, only the photovoltaic modules 10 adjacent to each other on the left and right sides are connected, and the photovoltaic modules above and below one end are connected, so that a large number of connected wires can be saved. According to the traditional connection scheme, due to the fact that the front row and the rear row are shielded, current mismatch can occur between the upper row and the lower row, but under the action of the power optimizer 30, the battery units 11 in the lower row can track and operate at the maximum power point, the output voltage of the power optimizer 30 is adjusted to match the change of the string current, the upper row and the lower row can operate at the maximum power point, and the influence of mismatch is avoided.
In summary, and with reference to FIG. 8, the actual operating principles of the method and system of the present invention are as follows: and under the condition that the mode is judged to be a sunny mode, sunlight can directly irradiate the photovoltaic power generation system. In the early and late stages, in two photovoltaic modules 10 in a row, the battery unit 11 at the bottom or the top of the two photovoltaic modules in the row can be shaded by front and back rows of shadows, and the optimal tracking angle can be determined by rotation between the solar altitude angle and the front shadow shading by acquiring the total power information of each power optimizer 30 and adjusting the set angle along with the astronomical tracking angle Ac through the tracking control module 60; at noon and before and after, the back irradiation may be uneven, the set angle may be adjusted by the tracking control module 60 along with the astronomical tracking angle Ac, the optimum tracking angle is determined by increasing the rotation angle or the revolution, the back irradiation of different intensities is more evenly irradiated in each battery cell 11, and the maximum power point is tracked under the action of the power optimizer 30. Meanwhile, each battery piece string 21 is formed by connecting rectangular short sides in series, the installation cost is lower, the vertical installation is suitable, and the wiring cost is further reduced by adopting a C-shaped series connection mode among the photovoltaic modules 10 on the support. The generated energy is improved by reducing the cost, and the single-shaft tracking support 50 can be applied to a large photovoltaic power station with practicability under the comprehensive effect of resisting voltage imbalance.
The foregoing embodiments have been described primarily for the purposes of illustrating the general principles, and features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
The foregoing description is only exemplary of the invention. From the above, those skilled in the art can make various changes and modifications without departing from the technical idea of the present invention. The protection scope of the present invention is not limited to the above-mentioned embodiments, but is subject to the scope defined by the claims.
Claims (10)
1. The single-shaft angle tracking method of the intelligent photovoltaic module is characterized by being applied to a photovoltaic power generation system capable of tracking angles, wherein the photovoltaic power generation system comprises at least one single-shaft tracking support (50), a plurality of photovoltaic modules (10) are installed on the single-shaft tracking support (50) in the row direction, each photovoltaic module (10) comprises at least two battery units (11) which are packaged in the photovoltaic modules (10) and are formed by connecting a same number of battery pieces in series/parallel and distributed in the column direction, each battery unit (11) is connected with a power optimizer (30), and each power optimizer (30) is connected in series and serves as an output end of each photovoltaic module (10); the angle tracking method comprises the following steps:
calculating according to a preset astronomical algorithm to obtain a tracking angle reference value Ac;
collecting electrical parameter information of a power optimizer (30) on a single-axis tracking support (50);
on the basis of the current tracking angle reference value Ac, the optimal angle is adjusted to the maximum extent according to the obtained electrical parameter information so as to meet the generated energy, and the single-shaft tracking support (50) is controlled to operate at the optimal tracking angle A;
and when the change of the electrical parameter information exceeds the preset requirement, the current optimal tracking angle A is obtained again.
2. The single-axis angle tracking method of an intelligent photovoltaic module according to claim 1, wherein the angle tracking method of the electrical parameter information by the power optimizer (30) comprises:
acquiring power information of power optimizers (30) on a single-axis tracking support (50), and acquiring the total power of each power optimizer (30);
adjusting the tracking angle of the single-axis tracking support (50) at a preset small angle according to the initial value Ac of the tracking angle, comparing the total power difference of the power optimizer (30) before and after the tracking angle is adjusted, judging whether the tracking angle is further adjusted until the small angle adjustment is accumulated to maximize the total power of the power optimizer (30), and controlling the single-axis tracking support (50) to operate at the current optimal tracking angle A;
and when the total power change of the collected power optimizer (30) exceeds a preset condition, the current optimal tracking angle A is obtained again.
3. The single-axis angle tracking method of the intelligent photovoltaic module according to claim 1, characterized in that the photovoltaic module (10) is a double-sided power generation module;
a method of angular tracking of electrical parameter information by a power optimizer (30) includes:
collecting power information of a power optimizer (30) on a single-axis tracking support (50);
adjusting the tracking angle of the single-shaft tracking support (50) at a preset small angle according to the initial value Ac of the tracking angle;
comparing the power difference of the power optimizer (30) in the column direction before and after the tracking angle adjustment, and judging whether to further adjust the tracking angle until the power difference of the current tracking angle in the column direction meets the preset requirement, so that the tracking angle is optimized A;
and when the difference of the power in the column direction of the collected power optimizer (30) exceeds a preset condition, the current optimal tracking angle A is obtained again.
4. The single-axis angle tracking method of the intelligent photovoltaic module according to claim 1, characterized in that the photovoltaic module (10) is a double-sided power generation module; the angle tracking method further includes:
collecting meteorological data information and judging the operation mode for controlling the single-axis tracking support (50);
and if the weather mode is a sunny mode, judging the stage, controlling the single-axis tracking support (50) to operate at an astronomical tracking angle Ac regulated by the optimized angle S, and determining the optimal tracking angle.
If the tracking angle is in the early and late stages, determining the optimal tracking angle according to the total power information change of the power optimizer (30) on the astronomical tracking angle A;
if the tracking angle is at the astronomical tracking angle A in the noon and early and late stages, the optimal tracking angle is determined according to the change of the power information of the power optimizer (30) in the column direction.
5. The single-axis angle tracking method of the intelligent photovoltaic module according to claim 4, wherein the operation mode of the single-axis tracking bracket (50) further comprises:
if the weather mode is a cloudy/rainy day mode, controlling the fixed angle of the single-axis tracking bracket (50) at the horizontal position and the position near the horizontal position to be fixed;
and if the weather mode is a cloudy mode, controlling the single-shaft tracking support (50) to operate at an astronomical tracking angle Ac.
6. The utility model provides an intelligence photovoltaic module's unipolar angle tracking system which characterized in that, this angle tracking system includes: the device comprises a photovoltaic assembly (10), a single-shaft tracking support (50) and a tracking control module (60);
the photovoltaic module (10) is formed by arranging and packaging cell pieces in a rectangular array, the cell pieces with equal areas are connected to form at least two cell units (11), each cell unit (11) comprises a plurality of cell piece strings (21) formed by mutually connecting cell pieces which are arranged in rows in the direction of the short side of a rectangle in series, the rectangular long side directions of the cell piece strings (21) are arranged and mutually connected in series and/or in parallel to form the output end of the cell unit (11), the output end of the cell unit (11) is connected with the input end of a power optimizer (30), and the output ends of the power optimizers (30) are connected in series and used as the output end of the photovoltaic module (10);
the single-shaft tracking support (50) is vertically provided with a plurality of photovoltaic modules (10) along the long side of the rectangle in the row direction, and the single-shaft tracking support (50) is connected with and controlled by the tracking control module (60);
the tracking control module (60) calculates a tracking angle reference value Ac through a preset astronomical algorithm, acquires electrical parameter information of a power optimizer (30) on the single-shaft tracking support (50), and controls the single-shaft tracking support (50) to operate at an optimal tracking angle A on the basis of the adjustment of the reference value Ac according to the electrical parameter information.
7. The single-axis angular tracking system of intelligent photovoltaic modules of claim 6, wherein the tracking control module (60) comprises: the system comprises an astronomical processing unit, an optimizer acquisition unit (62), an optimization control unit (66) and a tracking judgment unit (65);
the astronomical processing unit calculates an initial value Ac of the tracking angle according to a preset astronomical algorithm;
the optimizer acquisition unit (62) acquires power information of the power optimizers (30) on the single-axis tracking support (50) and acquires the total power of each power optimizer (30);
the optimization control unit (66) adjusts the tracking angle of the single-shaft tracking support (50) at a preset small angle according to the initial value Ac of the tracking angle, compares the total power difference of the power optimizer (30) before and after the tracking angle is adjusted, judges whether the tracking angle is further adjusted until the small angle adjustment is accumulated to maximize the total power of the power optimizer (30), and controls the single-shaft tracking support (50) to operate at the current optimal tracking angle A;
and the tracking judgment unit (65) judges whether the total power change of the power optimizer (30) exceeds a preset condition or not so as to maintain the single-shaft tracking support (50) to operate at the optimal tracking angle A.
8. The single-axis angular tracking system of intelligent photovoltaic modules of claim 6, wherein the tracking control module (60) comprises: the device comprises an astronomical processing unit, an optimizer acquisition unit (62), an optimization control unit (66) and a tracking judgment unit (65);
the astronomical processing unit calculates an initial value Ac of the tracking angle according to a preset astronomical algorithm;
the optimizer acquisition unit (62) acquires power information of the power optimizer (30) on the single-axis tracking support (50) and obtains the power difference of the power optimizer (30) in the column direction;
and the optimization control unit (66) adjusts the tracking angle of the single-axis tracking support (50) at a preset small angle according to the initial value Ac of the tracking angle, compares the power difference of the power optimizer (30) in the column direction before and after the tracking angle is adjusted, and judges whether to further adjust the tracking angle until the power difference of the current tracking angle in the column direction meets the preset requirement, so that the tracking angle is optimized A.
And the tracking judgment unit (65) compares and judges whether the difference change of the power information of each power optimizer (30) in the column direction before and after adjustment exceeds a preset requirement or not so as to maintain the single-axis tracking support (50) to operate at the optimal tracking angle A.
9. The single-axis angular tracking system of intelligent photovoltaic modules of claim 6, wherein the tracking control module (60) further comprises: a mode judgment unit (64) and an air image acquisition unit (63);
the weather obtaining unit (63) obtains weather data information;
the mode judging unit (64) operates in a corresponding weather mode according to the meteorological data information;
if the weather mode is a rainy day mode, controlling the single-axis tracking support (50) to be fixed at a fixed angle of zero degree or close to zero point;
if the weather mode is a cloudy mode, controlling the single-shaft tracking support (50) to operate at an astronomical tracking angle Ac;
if the weather mode is a sunny day mode, judging the running stage of the single-axis tracking support (50), and if the weather mode is a morning and evening stage, determining the optimal tracking angle according to the total power information of the power optimizer (30) and the astronomical tracking angle Ac; and if the current tracking angle is at noon and before and after, determining the optimal tracking angle according to the power information difference of the power optimizer (30) in the column direction and the astronomical tracking angle Ac.
10. The single-axis angle tracking system of the intelligent photovoltaic module according to claim 6, wherein, in the battery unit (11), part of the battery piece strings (21) are connected in parallel with each other with the same polarity orientation to form a first string group (221), the other part of the battery piece strings (21) with the same number are connected in parallel with each other with the opposite polarity orientation to form a second string group (222), the first string group (221) and the second string group (222) are connected in series with each other, and both ends of the series are connected to the power optimizer (30); the battery piece strings (21) with the same polarity are adjacently arranged, or the battery piece strings (21) with the opposite polarity are adjacently arranged; the single-shaft tracking support (50) is provided with at least two rows of photovoltaic modules (10); the power optimizer (30) is a photovoltaic maximum power tracking DC/DC conversion module (31).
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| US10797636B2 (en) * | 2017-01-26 | 2020-10-06 | Evermore United S.A. | Waterless cleaning system and method for solar trackers using an autonomous robot |
| CN108347221B (en) * | 2018-05-18 | 2019-09-10 | 江苏中信博新能源科技股份有限公司 | A kind of tracking and controlling method and system of double side photovoltaic battery plate |
| CN110568865A (en) * | 2019-04-30 | 2019-12-13 | 天合光能股份有限公司 | Intelligent optimization method and intelligent tracking system for tracking angle of double-sided assembly |
| CN110658858B (en) * | 2019-10-19 | 2023-06-27 | 天合光能股份有限公司 | Uneven topography inverse tracking method based on intelligent photovoltaic module |
| CN213717907U (en) * | 2020-11-23 | 2021-07-16 | 广州中旭新能源有限公司 | Single-shaft angle tracking system of intelligent photovoltaic module |
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| CN115833242A (en) * | 2022-12-13 | 2023-03-21 | 深圳市粤能电气有限公司 | Self-adaptive switching control method and system for mobile array optical storage system |
| CN115833242B (en) * | 2022-12-13 | 2023-09-05 | 深圳市粤能电气有限公司 | Self-adaptive switching control method and system for mobile array optical storage system |
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