5555 results about "Photovoltaics" patented technology

Disclosed is a microgrid optimal scheduling method taking into consideration a system operation risk and user satisfaction, comprising: generating a power prediction curve of wind power and photovoltaic new energy output in a microgrid, using a Monte Carlo simulation method to obtain a prediction error range to generate a typical scene set, and by means of a data fitting method, acquiring a wind-photovoltaic prediction error probability density distribution function; using value-at-risk and conditional value-at-risk theories to quantify a microgrid operation risk which is increased by slightly high or low output caused by wind power and photovoltaics; obtaining the scheduling cost of an adjustable load in a microgrid system; taking the minimum sum of conditional value-at-risk cost and microgrid system operation cost as an objective function and a user satisfaction level under a demand-side response as a constraint, establishing a microgrid optimal scheduling model taking into consideration the operation risk and the user satisfaction; and using a genetic algorithm to solve the model, and obtaining an optimal result of grid-connected microgrid system optimal scheduling. The safety, economic efficiency, stability and reliability of the microgrid are enhanced.

The invention discloses an optical storage and charging integrated micro-grid energy management system, which relates to the related technical field of micro-grids and comprises an electric energy collection layer, a digital twinborn layer, a collaborative optimization layer, an application execution layer, a photovoltaic power generation unit, an energy storage unit, a charging load unit and a distributed measurement and control terminal. The invention further discloses an energy management method of the photovoltaic, storage and charging integrated micro-grid. The energy management method comprises the steps of data acquisition, digital twin modeling, multi-target strategy generation and optimization, strategy evaluation and screening, strategy issuing and execution and closed-loop feedback and dynamic correction. According to the invention, through short-term prediction of a digital twinborn layer and real-time generation of a charging and discharging strategy by a collaborative optimization layer, fluctuating renewable energy sources are preferentially consumed, the light abandoning rate is reduced, energy storage charging is automatically triggered in an illumination peak period, and power overflow is avoided; based on the simulation result of the digital twinborn model, the power distribution of energy storage and load is dynamically adjusted, so that the photovoltaic utilization rate is improved, and the dependence on a traditional power grid is reduced.

The invention discloses a photovoltaic panel automatic cleaning system based on an unmanned aerial vehicle and a method thereof, and relates to the technical field of solar photovoltaic. The system comprises an unmanned aerial vehicle, a pollutant cleaning device, a pollutant detection device and a remote control center, comprising the steps of planning a flight path of an unmanned aerial vehicle and obtaining a photovoltaic panel image to determine the type, position and cleaning time of pollutants; a cleaning mode is selected to carry out cleaning operation, and secondary detection is carried out on the cleaned photovoltaic panel; and recording each cleaning task and process and establishing a self-adaptive model. The unmanned aerial vehicle is used for monitoring the photovoltaic panel in real time, image analysis and pollutant identification are carried out through the remote control center, the cleaning device is used for cleaning the photovoltaic panel, and the pollutant detection device is used for carrying out secondary detection after cleaning; according to the cleaning device, multiple cleaning modes are combined, flexible selection is achieved according to the types of pollutants, the cleaning effect of the photovoltaic panel is guaranteed, the cleaning efficiency is improved, and meanwhile the energy-saving effect is achieved.

The invention provides a photovoltaic module and a photovoltaic system, and relates to the technical field of photovoltaics. The photovoltaic module comprises an insulating part, a conductive back plate and a back contact battery piece. The back contact battery piece comprises a collector grid line; the combined parts and the non-combined parts extend in the second direction and are alternately distributed in the first direction, and each of the combined parts and the non-combined parts comprises a part of the collector grid line; the conductive back plate comprises a conductive layer and an insulating layer located between the conductive layer and the back contact battery piece; a through hole is formed in a position, corresponding to at least one combination part, in the insulating layer; the through hole is filled with a bonding material; the current collection grid line of one polarity in the combination part is electrically connected with the conductive layer through a combination material, and the current collection grid line of the other polarity is provided with an insulating part and is insulated from the conductive layer through the insulating part; for one through hole, the ratio of the width of the insulator to the width of the through hole is greater than 1 and less than or equal to 50. The photovoltaic module has the advantages of small hidden crack risk, easy mass production, long service life and good current collection effect.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact battery and a photovoltaic module, the back contact battery comprises first and second main grids which are alternately arranged along a first direction, the first main grid comprises a plurality of first parts which are arranged at intervals along a second direction, and the second main grid comprises a plurality of second parts which are arranged at intervals along the second direction; the first penetrating line extends along the first direction and is in contact connection with the plurality of first parts in the same row along the first direction; the second penetrating lines extend in the first direction and are in contact connection with the multiple second parts located in the same row in the first direction; the adjacent first and second through lines form a through line group, the number of the through line groups is reduced along with the increase of the number of the main grids, in the second direction, the width of at least one of the first and second through lines is reduced along with the increase of the number of the main grids, and the number of the main grids is the sum of the number of the first and second main grids, so that the electrical performance of the back contact battery is improved at least; and the preparation cost of the back contact battery is reduced.

The embodiment of the invention relates to the photovoltaic field, and provides a main-grid-free back contact battery and a photovoltaic module, and the main-grid-free back contact battery comprises a battery substrate which is provided with a first welding region and a second welding region which are alternately arranged along a first direction, two edge regions which are opposite along a second direction, and a central region located between the two edge regions; the first fine grid and the second fine grid are positioned on the battery substrate and are alternately arranged along a second direction; the bonding pads are located in the edge area, and each bonding pad is at least in contact connection with two adjacent homopolar fine grids; the welding spots are located in the central area, each welding spot is in contact connection with each same-polarity fine grid, and M same-polarity fine grids are arranged between the bonding pads and the welding spots which are adjacent in the second direction; the connecting line is in contact connection with the bonding pad and is also in contact connection with at least one welding spot close to the bonding pad along the second direction; the welding area is a first welding area and the same-polarity fine grid is a first fine grid, and / or the welding area is a second welding area and the same-polarity fine grid is a second fine grid, so that the photoelectric conversion efficiency of the main-grid-free back contact battery is at least improved.

The invention discloses a building carbon emission analysis method based on an STIRPAT algorithm and a building information model technology, and the method comprises the steps: collecting the whole life cycle information of a building through the BIM technology in a data collection and integration stage, covering the data of all links of design, construction and operation, widely collecting the external environment data of a project location, such as social economy, energy technology, etc. Multi-source data such as geographic space and weather are introduced and fused, and real-time monitoring is performed by means of an intelligent sensing technology. Secondly, an extended STIRPAT model is constructed, core independent variables such as population, economy and technology and control variables such as building scale are comprehensively considered, and the influence of factors is accurately quantified through dynamic parameter adjustment and scene simulation prediction; according to the method, carbon emission attributes are given to components and equipment based on a BIM model, full-life-cycle carbon emission is simulated and calculated, integrated optimization is carried out with solar photovoltaic, intelligent control, waste management and other technologies, finally, results are comprehensively analyzed, carbon emission distribution and trend are displayed by utilizing a BIM visualization function, and a building low-carbon decision is provided.

Disclosed in the present invention are a voltage control method and system for clusters of a power distribution network having a high proportion of photovoltaics. The method comprises: acquiring parameters of a power distribution network, and constructing a comprehensive electrical distance by means of adjustable active power and reactive power reserves of each node in the parameters of the power distribution network; forming an improved weight matrix by means of distributed photovoltaic reactive power and active power supporting capacities, a reactive power sensitivity matrix and an active power sensitivity matrix, and obtaining an optimal reactive power cluster and active power cluster division result by a community algorithm by means of a node coupling degree index in each cluster and the comprehensive electrical distance; and selecting, by means of a clustering algorithm on the basis of the division result, a key node in each cluster to act, to improve the cluster voltage regulation and control capability. Starting from the relationship between active power sensitivity and reactive power sensitivity, and considering the impact of different changes on other nodes, efficient utilization of the reactive power regulation capability of a grid-connected PV inverter can be achieved, the complexity of control strategy computation is greatly reduced, and the situation where there are too many adjustable distributed photovoltaics in clusters is avoided.

The invention provides a photovoltaic module and a photovoltaic system, and relates to the technical field of photovoltaics. The photovoltaic module comprises a conductive backboard and a back contact battery piece arranged on the conductive backboard. The back contact battery piece comprises a plurality of current collection grid lines and a plurality of current collection grid lines. The conductive back plate comprises a conductive layer and an insulating layer located between the conductive layer and the back contact battery piece; a through hole is formed in the position, corresponding to the bus grid line, in the insulating layer, the through hole is filled with a bonding material, and the bus grid line is electrically connected with the conducting layer through the bonding material in the through hole; in a back contact battery piece area, the ratio of the total number of the through holes in the area, corresponding to one column of bus grid lines, in the insulating layer to the total column number of the bus grid lines in one back contact battery piece is 0.17-3. The photovoltaic module is low in hidden crack risk, high in current transmission efficiency, good in insulating performance of the insulating layer, good in reliability and simple in technological process.

The invention discloses a solar photovoltaic panel cleaning method and device based on a multi-mode cleaning technology, which can plan a traversal path according to parameters of a photovoltaic panel, primarily remove dust by using a wind blowing and ultrasonic vibration form, plan an energy-saving cleaning path for still existing cleaning points, and improve the cleaning efficiency of the photovoltaic panel. And secondary cleaning is conducted along the cleaning path, dust is adsorbed and cleaned through an electric field generated by the electrode plate, meanwhile, the output parameter set is trained and optimized through a trained deep learning model through input parameters extracted in real time, optimal cleaning parameters are obtained, and intelligent cleaning is achieved.

The invention discloses a power distribution network intelligent scheduling method and system based on data enhancement and topology awareness dynamic partitioning. The method comprises the steps of performing data enhancement by using an improved Wasserstein generative adversarial network model based on photovoltaic historical feature data; constructing a dynamic partition evaluation index system, and realizing self-adaptive partition of the power distribution network topology based on an improved genetic algorithm; and constructing a mixed attention mechanism and fusing the mixed attention mechanism into a graph convolutional network for solving optimal scheduling of the power distribution network, realizing partition autonomous optimization through local attention, coordinating power interaction among regions through global attention, and outputting an optimal scheduling scheme meeting network constraints. According to the method, dynamic partitioning and optimal scheduling are combined, historical data limitation is broken through by improving the generative adversarial network, an intelligent model with topology perception capability is constructed, the problem of model adaptation in scale difference and meteorological diversity scenes is solved, and the consumption capability of a power distribution network on high-permeability distributed photovoltaic power is remarkably improved.

The invention provides a device and a method for extracting water from air operated under all working conditions. The device comprises a solar power supply unit, a salt-carrying hydrogel adsorption-desorption unit, an electric heating desorption unit, a water vapor condensation and collection unit and a PID control unit. The solar power supply system comprises a solar photovoltaic panel, an MPPT (maximum power point tracking) type photovoltaic inverter and a storage battery, the salt-carrying hydrogel adsorption-desorption unit comprises hydrophilic porous hydrogel and a LiCl / CaCl2 composite adsorption material, and the electric heating desorption unit comprises a copper heat-conducting plate loaded with the adsorption material and an electric heating sheet. The water vapor condensation and collection unit is composed of four finned radiators and two semiconductor chilling plates. The PID control unit is composed of a temperature and humidity sensor and a control circuit, wherein the temperature and humidity sensor is connected to the radiators and the front side of the adsorption bed. Water vapor in the environment is enriched through an efficient salt-loaded adsorbent packed bed, desorption is driven in two modes of solar photo-thermal and electric heating, desorbed high-humidity airflow passes through a fin type cooling fin connected with a semiconductor and then is condensed into liquid water, and the process of taking water from air is completed through a collector below. According to the device, low-energy-consumption air water taking under the humidity of 15%-100% can be achieved by controlling the operation time of all the units, the device is portable and compact, the automation degree is high, and high-water-yield air water taking is achieved by using solar photo-thermal and power generation as energy input.

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic cell and a manufacturing method thereof, and a photovoltaic module, the photovoltaic cell comprises a substrate, the substrate is provided with a first surface and a second surface which are opposite, and the first surface is provided with first areas and second areas which are alternately arranged along a first direction; the substrate located in the second area comprises a bottom surface sunken towards the interior of the substrate, at least two inclined surfaces connected with the bottom surface and the first area and a step surface connected with the adjacent inclined surfaces, the bottom surface, the inclined surfaces and the step surface jointly define a groove, and the inclined surfaces incline towards the direction, close to the first area, of the second area; the bottom surface is a first suede comprising a plurality of first pyramids, the step surface is a second suede comprising a plurality of second pyramids, the tower footing size of the first pyramids is larger than that of the second pyramids, and the tower height of the first pyramids is larger than that of the second pyramids. According to the embodiment of the invention, the overall flatness of the second area is improved while the light trapping effect of the second area is improved at least.

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic cell and a manufacturing method thereof, and a photovoltaic module, the photovoltaic cell comprises a substrate, the substrate is provided with a first surface and a second surface which are opposite, and the first surface is provided with first areas and second areas which are alternately arranged along a first direction; the substrate in the second area comprises a bottom surface which is recessed towards the interior of the substrate and a slope which is connected with the bottom surface and the first area, the slope inclines towards the first area, and the bottom surface and the slope define a groove; the bottom surface is a first suede comprising a plurality of first pyramids, the slope is a second suede comprising a plurality of second pyramids, an included angle formed by spire of the first pyramids is smaller than an included angle formed by spire of the second pyramids, and the height of the first pyramids is smaller than that of the second pyramids. The embodiment of the invention is at least beneficial to improving the absorption and utilization rate of the second region on light, so as to improve the photoelectric conversion efficiency of the photovoltaic cell.

The invention discloses a solar cell and a manufacturing method thereof, and a photovoltaic module, and relates to the field of photovoltaic technology. The solar cell includes: a semiconductor substrate having a first surface including a first region and a second region adjacent to a first cut side; the second region comprises a step structure, an included angle is formed between the side wall of the step structure and the thickness direction of the semiconductor substrate, the first region is provided with a first pyramid structure, and the bottom wall of the step structure is provided with a first texture structure or a second pyramid structure; the first doping layer is arranged on the first region, and the height of the bottom wall of the step structure is lower than that of the first doping layer; the first passivation layer is arranged on one side, deviating from the semiconductor substrate, of the first doping layer and is arranged on the second region; the second passivation layer is arranged on the edge, close to the second area, of the first area, part of the second area and the first cutting side face. The passivation effect near the cutting side face is improved, carrier recombination is reduced, and the photoelectric conversion efficiency is improved.

The invention discloses a near-zero energy consumption building energy supply method and system based on multi-objective optimization, and relates to the technical field of building energy efficiency and renewable energy application, and the method comprises the steps: collecting energy consumption data in a building, and constructing a multi-objective evaluation system according to the energy consumption data; performing weight optimization on the multi-target evaluation system to obtain an optimal weight coefficient; combining the optimal weight coefficient with a solar photovoltaic system and a ground source heat pump system, and establishing a renewable energy supply strategy model; and outputting an energy supply scheduling instruction of the building in each time period based on the renewable energy energy supply strategy model, and adjusting operation parameters of a solar photovoltaic system and a ground source heat pump system. According to the invention, by adjusting the operation mode of the equipment in real time, the balance between the energy efficiency and the comfort level is ensured, the common problem of energy efficiency waste or insufficient comfort level in the traditional method is avoided, and by means of intelligent scheduling and optimization, the energy consumption of the building can be effectively reduced, and the sustainability of energy utilization of the building is improved.

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic cell and a manufacturing method thereof, and a photovoltaic module, the photovoltaic cell comprises a substrate, the substrate comprises a first surface and a second surface which are oppositely arranged, the first surface comprises non-metal regions and metal regions which are alternately arranged along a first direction, the non-metal regions are first suede surfaces, and the metal regions are second suede surfaces; the first suede comprises a plurality of first pyramids with rough surfaces; the first pyramid comprises a main body part and at least two wrapping parts which are located on the side face of the main body part and connected in the direction perpendicular to the side face. Wherein the main body part is a pyramid-like pyramid with a plurality of side edges, the side surfaces are connected with the adjacent side edges, and the main body part further comprises a bottom surface connected with the plurality of side surfaces; the wrapping part extends towards the direction close to the bottom face in the second direction, one end, away from the bottom face, of the wrapping part comprises a protruding block, the protruding block is in a protruding shape relative to the bottom face, and the second direction is the extending direction of the side edges, so that the reflectivity of the non-metal area to light is at least reduced, and the photoelectric conversion efficiency of the photovoltaic cell is improved.

Disclosed are a back contact solar cell, a preparation method therefor, and a photovoltaic module, related to the technical field of photovoltaics. The back contact solar cell comprises a silicon substrate having a first surface, wherein the first surface comprises: a first conductive area, a second conductive area, and an insulating area located between the first conductive area and the second conductive area; a first transmission layer, located on the first conductive area and the insulating area; a barrier layer, located in the insulating area on the first transmission layer; a second transmission layer, located on the barrier layer and the second conductive area; and a transparent conductive layer, located on the second transmission layer and the exposed first transmission layer, wherein a part of the transparent conductive layer located in the insulating area is provided with an insulating opening, and the insulating opening electrically isolates the first transmission layer from the second transmission layer. Through the arrangement of the insulation opening, insulation reliability is better.

Provided are a solar cell, a method for preparing a solar cell, and a photovoltaic module, relating to the field of photovoltaics. The solar cell includes a substrate, a dielectric layer and a doped semiconductor layer which are stacked, a passivation layer, and electrodes. The substrate has a first surface. The first surface includes an edge region and a center region. The edge region surrounds the center region. The edge region is substantially flush with or closer to the second surface than the center region. The dielectric layer is formed over the center region. The passivation layer covers the edge region and a surface of the doped semiconductor layer facing away the dielectric layer. The electrodes are located in the center region, and penetrate the passivation layer in a thickness direction to be in electrical contact with the doped semiconductor layer.

A back-contact cell and a manufacturing method therefor, and a photovoltaic module, which belong to the technical field of photovoltaics. The back-contact cell comprises: a semiconductor substrate, which has a first surface and a second surface, which are arranged opposite each other, wherein the first surface is of a textured structure; and a tunneling passivation layer and an N-type doped polycrystalline silicon layer, which are sequentially stacked in a local region of the second surface in the thickness direction of the semiconductor substrate, wherein the ratio of the thickness of the part of the N-type doped polycrystalline silicon layer that is located in an edge region of the second surface to the thickness of the part of the N-type doped polycrystalline silicon layer that is located in the central region of the second surface is greater than or equal to 1 and is less than or equal to 1.2.

The invention relates to the technical field of energy scheduling, in particular to an intelligent power utilization system based on an optical storage direct flexible technology. The photovoltaic power generation unit is used for collecting solar energy by installing a solar photovoltaic panel and converting the solar energy into electric energy; the energy storage unit is used for storing excess electric energy, and when the electric energy generated by the photovoltaic power generation unit is insufficient or has no energy, the electric energy of the storage unit is used for supplying power; the power utilization management unit is used for monitoring and managing distribution of direct current in the photovoltaic power generation unit and then dynamically adjusting the direct current according to actual requirements; according to the system, factors such as temperature, seasons and system loss are comprehensively considered, so that the actual power generation capacity of the photovoltaic system can be more comprehensively reflected, and the prediction precision and reliability of the system are improved; through real-time data acquisition and processing, the system can predict future electric energy supply and demand conditions in advance, so that the overall operation efficiency and stability of the system are improved.

A cable winding and unwinding device for solar photovoltaic power generation, the device comprising a first rotating rod (1), wherein a tightening mechanism (2) is fixedly connected to one end of the first rotating rod (1), the tightening mechanism (2) comprises a winding column (201), one end of the winding column (201) is rotatably connected to a first upright plate (202) by means of a rotating bolt, a drive shaft of an electric motor (203) penetrates through and is rotatably connected to the side of the first upright plate (202) that is away from the winding column (201), a second upright plate (204) is rotatably connected to the side of the winding column (201) that is away from the first vertical plate (202) by means of a rotating bolt, an arc-shaped long plate (205) is fixedly connected to the top of the second upright plate (204), a snap-fit hole (206) is formed on one side of the arc-shaped long plate (205), and a compression spring (207) is fixedly connected at the top of the inner wall of the snap-fit hole (206). According to the cable winding and unwinding device for solar photovoltaic power generation, by means of a rounded-corner sliding shell (210) abutting against a photovoltaic cable (6), outward loosening and falling-off of the photovoltaic cable (6) is prevented during winding; and by means of a stop block (208) abutting against a small sliding rod (209), incomplete abutment of the rounded-corner sliding shell (210) due to shaking and shifting of the small sliding rod (209) driven by the winding column (201) during cable winding is prevented.

The invention relates to the photovoltaic field, and provides a back contact photovoltaic module, which comprises a plurality of battery strings, each battery string comprises a head end and a tail end which are oppositely arranged, and each battery string comprises a first battery piece arranged at the tail end and a second battery piece connected with the first battery piece; the first welding strip extends along the first direction and is electrically connected with the first battery piece and the second battery piece; the first isolating membrane is located on the second battery piece and located on the surface, deviating from the second battery piece, of the first welding strip; the first bus bar is located on the surface, deviating from the second battery piece, of the first isolating membrane; the second welding strip comprises a first part and a second part, the first part is located on the first battery piece and electrically connected with the first battery piece, and the second part is located on the surface, away from the second battery piece, of the first isolating membrane and electrically connected with the first bus bar. The power of the back contact photovoltaic module can be improved at least, and the reliability of the back contact photovoltaic module is improved.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact cell and a manufacturing method thereof, a back contact laminated cell and a photovoltaic module, and the manufacturing method comprises the steps: providing a substrate with a first surface and a second surface which are opposite to each other, and the second surface comprises a first region and a second region which are alternately arranged along a second direction; forming a laminated structure comprising a tunneling layer, a doped polycrystalline silicon layer and a first protection layer which are stacked on the first region; forming an initial second passivation lamination layer which covers the second surface and comprises an intrinsic amorphous silicon film and a doped amorphous silicon film which are stacked; forming a second protection layer on one side, far away from the substrate, of the doped amorphous silicon film; etching the first region by adopting a first laser etching process; and taking the second protection layer on the second region as an etching barrier layer, taking the first protection layer as an etching stop layer, and removing the initial second passivation lamination layer or the second protection layer and the initial second passivation lamination layer remaining on the first region by adopting a first etching solution, thereby at least facilitating the improvement of the photoelectric conversion efficiency of the back contact battery.

The invention relates to the field of solar photovoltaic power generation, in particular to a multi-mode ultra-short-term solar irradiation prediction method and system based on a sky image, and the method comprises the steps: collecting a sky image and meteorological data shot by an all-sky imager; preprocessing the collected image, extracting cloud layer information through graying and a normalized red-blue ratio, and extracting dynamic characteristics by using a dense optical flow method; a 3D-ResNet model is adopted to extract spatial features of the image, and an Informer model is utilized to perform time sequence coding on historical irradiation data; and through a multi-modal interaction fusion matrix based on an attention mechanism, carrying out alignment fusion on the spatial features of the sky image and the time sequence features of the irradiation, and generating a predicted value of the solar irradiation. According to the invention, the precision of ultra-short-term solar irradiation prediction can be improved, and especially in a time range of 5-10 minutes, the method has relatively strong real-time performance and accuracy.

The invention provides a back contact solar photovoltaic module and a preparation method thereof, and belongs to the technical field of solar photovoltaic module manufacturing. The back contact solar photovoltaic module comprises a plurality of battery strings which are distributed side by side, each battery string comprises a plurality of battery pieces which are distributed at intervals, the back faces of the battery pieces are sequentially connected through a welding strip, in the extending direction of the battery strings, the welding strip comprises a non-confluence connecting area and a confluence connecting area located in the middle, the confluence connecting area is welded with a confluence strip, and the non-confluence connecting area is connected with the confluence strip. The bus bars are positioned on the back surfaces of the battery pieces, are in insulated connection with the back surfaces and are used for leading out current; in the extension direction of the battery string, the distance between any two adjacent battery pieces is 0.5-4 mm, and the tolerance is less than 0.2 mm. The back contact solar photovoltaic module has high product power.

The invention discloses a back contact battery, a manufacturing method thereof and a photovoltaic module, relates to the technical field of photovoltaics, and aims to reduce the hot spot risk of the back contact battery. A back contact cell includes a semiconductor substrate, a first doped semiconductor layer, a second doped semiconductor layer, and a transparent conductive layer. The thickness of the first doped semiconductor layer is greater than that of the second doped semiconductor layer. The transparent conductive layer is internally provided with an insulating groove, so that the part, electrically connected with the first doped semiconductor layer, of the transparent conductive layer is physically insulated from the part, corresponding to the second area, of the transparent conductive layer. A reverse electric leakage part included in the second doped semiconductor layer is electrically connected with the first doped semiconductor layer, and the reverse electric leakage part is covered with a transparent conductive layer extending from the second area. The first doped semiconductor layer includes a corner region. The corner region is from a sidewall root of the first doped semiconductor layer to an edge of the first doped semiconductor layer near the sidewall. The reverse electric leakage part is located in the corresponding range of the corner area of the first doped semiconductor layer.

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic cell and a preparation method thereof, and a laminated cell, and the preparation method comprises the steps: providing an initial photovoltaic cell, the first surface of which comprises a first laser region and a first non-laser region, and the second surface of which comprises a second laser region and a second non-laser region; the first doped film, the first functional film, the second doped film and the second functional film sequentially cover the first surface, and the tunneling film, the passivation film and the third functional film sequentially cover the second surface. Meanwhile, a laser treatment process is adopted on the first surface and the second surface, at least the part, located in the first laser area, of the second functional film is converted into a first laser part, and the part, located in the second laser area, of the third functional film is converted into a second laser part; and removing the second functional film, the second doped film, the first functional film, the third functional film, the first doped film located in the first laser region and the passive film and the tunneling film located in the second laser region by adopting an etching process, thereby at least facilitating simplification of the process steps of preparing the photovoltaic cell.

The invention discloses a method for setting the availability rate of photovoltaic participation in power balance, comprising the following steps: S1, collecting photovoltaic output history data and photovoltaic installed capacity data of a required calculation time; S2, performing data processing on the collected photovoltaic output history data, taking out and sorting holiday data separately, and dividing them into ordinary data and holiday data; S3, performing per-unit processing on the data obtained in S2; S4, classifying them according to months (holidays), and splicing them to obtain a data set with months (holidays) as categories; S5, using the 3-sigma rule to perform correction calculation on the data in the data set that does not meet the requirements; S6, calculating the availability rate of photovoltaic participation in power balance in each month (holiday); the method can effectively calculate the availability of photovoltaics in a medium- and long-term power balance plan, which is beneficial to assisting a scheduling planning organization in arranging a balance plan for conventional power sources and ensuring the safety and stability of the power system.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact battery and a photovoltaic module, and the back contact battery comprises a substrate with a first edge; the first doped conductive layers and the second doped conductive layers are alternately distributed on the second surface of the substrate; the first grid lines and the second grid lines are alternately arranged in the first direction; the first connecting lines and the second connecting lines are alternately arranged in the second direction, the first connecting lines are electrically connected with the first grid lines, the first connecting lines comprise edge connecting lines and middle connecting lines, welding parts are not arranged on the edge connecting lines, the second connecting lines adjacent to the edge connecting lines comprise function parts and interval parts, and the function parts are connected with the second grid lines; one end of the connecting structure is electrically connected with the edge connecting line, and the other end passes through the spacing part and is electrically connected with the middle connecting line adjacent to the edge connecting line. According to the embodiment of the invention, the performance of the back contact battery and the yield of the photovoltaic module can be improved at least.