3747 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 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 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 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 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.

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.

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 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 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.

The invention relates to an optimization method based on a distributed solar photovoltaic power generation control system. The method comprises the following steps: collecting generating capacity data, voltage data, current data and solar radiation data; inputting a photovoltaic multi-mode deep learning prediction model for processing, and generating an active power adjustment strategy and a reactive power adjustment strategy; generating a control instruction, performing hierarchical security constraint check on the control instruction, and generating a remote control instruction and a local control instruction; performing hierarchical reinforcement learning control and power optimization adjustment on the inverters in the plurality of control groups to obtain a group total output value; performing real-time monitoring to generate operation parameter data; and calculating the active power qualified rate, the control response time, the control precision and the system volatility, and carrying out multi-target optimization on the adjustment dead zone range, the control gain and the response time constant to obtain a target power distribution scheme. According to the invention, reasonable load distribution of each inverter is ensured, and the operation stability and reliability of the system are improved.

The invention discloses an optimal scheduling method for grid connection of a power distribution network and a distributed power supply, and particularly relates to the technical field of optimal scheduling, which comprises the following steps of: determining employment performance information during grid connection of the distributed photovoltaic power supply according to the difference between real-time and historical solar photovoltaic output models; based on charge state data of an energy storage system connected with the distributed photovoltaic power supply, determining energy storage performance information during grid connection of the distributed photovoltaic power supply, determining a grid connection strategy of the distributed photovoltaic power supply, and determining a grid connection strategy of the distributed photovoltaic power supply based on consideration of a node system topology connection relation of the power distribution network and related data of nodes and branches; possible risks existing in distributed photovoltaic power grid-connected nodes in the power distribution network are simulated, grid-connected risk information of the power distribution network is determined, the matching degree of output power and required power of the distributed photovoltaic power is considered, grid-connected load matching information of the power distribution network is determined, and the overall grid-connected performance of the power distribution network is quantified. According to the invention, stable operation of the power distribution network can be ensured.

The invention discloses a distributed robust optimization scheduling method and system for a solar photovoltaic photo-thermal comprehensive utilization system, and belongs to the field of comprehensive utilization of renewable energy sources. The method comprises the steps of obtaining an electrical load and a thermal load based on an integrated load prediction model; obtaining typical sunlight photovoltaic and photo-thermal based on scene clustering analysis; based on photovoltaic, photo-thermal, electrical load and thermal load, an objective function and a constraint condition for optimal scheduling are set for the solar photovoltaic photo-thermal comprehensive utilization system, and based on the objective function and the constraint condition, a two-stage distribution robust optimal scheduling model is obtained by combining a comprehensive demand response mechanism; and solving the two-stage distribution robust optimization scheduling model by adopting a column and constraint generation algorithm to obtain a two-stage distribution robust optimization scheduling result. The method obviously improves the utilization rate of renewable energy sources, reduces the operation cost and carbon emission of the system, and is suitable for building energy systems in solar energy-enriched areas.

The invention discloses a distribution network source-load collaborative micro-grid autonomous system and method, relates to the technical field of micro-grids, and realizes interconnection and intercommunication between an intelligent fusion terminal and equipment such as a charging pile, a photovoltaic device, an energy storage device, a low-voltage intelligent switch and the like by utilizing wireless communication technologies such as HPLC (High Performance Liquid Chromatography), 5G (5th Generation) and the like compared with the previous micro-grid autonomous system. By applying intelligent algorithms such as linear regression and machine learning, the platform automatically generates various optimization adjustment strategies, and after the strategies are audited by management personnel, a control command is issued to the terminal equipment through the intelligent fusion terminal; and remote intelligent operations such as energy storage charging and discharging mode adjustment, charging pile output power limit, photovoltaic output flexible regulation and control and automatic switching on and switching off of a low-voltage intelligent switch are realized. And performing whole-process monitoring on strategy execution, determining whether the strategy execution reaches a preset target, outputting a result analysis report, continuously optimizing an intelligent algorithm in combination with field equipment operation parameters, and continuously improving a source-network-load-storage collaborative interaction level.

The embodiment of the invention relates to the photovoltaic field, and provides a back contact battery, a back contact laminated battery and a photovoltaic module, and the back contact battery comprises a battery substrate which is provided with two opposite edge regions along a first direction, two opposite edge regions 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 pad is positioned in the edge region; at least the edge connecting line located in the edge area and the bonding pad closest to the edge connecting line are electrically connected with the same-polarity grid line; the first connecting part is electrically connected with the edge connecting line and the bonding pad closest to the edge connecting line; the second connecting part is electrically connected with the opposite grid lines disconnected by the bonding pad; the edge connecting line comprises two thickened parts and a main body part positioned between the two thickened parts; the thickened parts are electrically connected with the same-polarity grid lines positioned in the edge area and the same-polarity grid lines which are positioned in the central area and are disconnected by the second connecting part; and one of the first fine grid and the second fine grid is the same-polarity grid line, and the other one is the opposite-polarity grid line, so that the electrical performance of the back contact battery is improved at least.

The utility model discloses a photovoltaic energy storage fishing boat which comprises a fishing boat body, a storage battery box body is installed inside the fishing boat body, and a rotating disc is installed at the top end of the storage battery box body in a rotating mode. A solar photovoltaic panel is arranged at the top of the rotating disc, hydraulic cylinders are fixedly mounted on the two sides of the top end of the rotating disc, first auxiliary shafts are fixedly mounted on the top ends of the two hydraulic cylinders and the two sides of the middle of the bottom end of the solar photovoltaic panel, and a light sensor senses the illumination angle and transmits a signal to a controller; and then the solar energy is transmitted to the corresponding hydraulic cylinder and the motor through the controller, the motor and the hydraulic cylinder can be driven to operate, so that the effect of changing the deviation angle and the rotation angle of the solar photovoltaic panel is achieved, the solar photovoltaic panel can always face a solar light source by adjusting the angle of the solar photovoltaic panel, and the energy of sunlight is absorbed to the maximum extent. The photovoltaic power generation efficiency can be improved, and a photovoltaic system can generate more electric energy under different weather conditions.

The utility model relates to a mounting frame for solar photovoltaic components, which includes: a base support component, the bottom end of which is fixedly arranged on the upper surface of an object for receiving solar energy for photovoltaic power generation; a platform, which is in a horizontal position; two support frames, which are arranged on the opposite side edges of the platform; a brake and a support, which are arranged in the longitudinal direction and are located on the opposite side edges of the platform that are different from the support frames; the brake can be extended up and down, and the support can be extended up and down in a driven state; a fixing mechanism, which is used to fix the photovoltaic panel, and the fixing mechanism can rotate along the axis formed by the upper ends of the two support frames, and the upper ends of the brake and the support are connected to the bottom surface of the fixing mechanism, and the moving member is extended up and down, driving the fixing mechanism, the photovoltaic panel and the horizontal plane to adjust the angle to the required angle. According to the flexible connection of the mounting frame for solar photovoltaic components of the utility model, only one brake is needed to achieve the angle adjustment of the photovoltaic panel.

The invention discloses a building group optimization scheduling method and system based on carbon emission responsibility of a high new energy permeability region, and the method comprises the steps: motivating a user side to carry out self-discipline adjustment through a dynamic carbon emission responsibility factor (Cr), constructing a multi-objective optimization model covering daily economy, carbon emission and user comfort, and solving through employing an improved particle swarm algorithm. The method specifically comprises the following steps: establishing an optical storage direct-flexible system topology model containing photovoltaic, energy storage and flexible loads; the dynamic Cr is calculated based on the responsibility allocation concept, and the principles of consistency, balance and the like are followed; a multi-time-scale optimization strategy is designed, and a scheduling instruction is adjusted in real time in combination with day-ahead prediction and intra-day rolling optimization; and the electric vehicle is used as energy storage equipment to participate in energy bidirectional interaction, so that the new energy consumption capability is improved. According to the invention, the daily carbon emission of the building group is reduced by more than 10%, the power grid voltage fluctuation is less than or equal to 5%, the user comfort is guaranteed, the power supply reliability and the energy utilization efficiency are improved, and technical support is provided for the low-carbon intelligent building group.

The invention discloses a back contact battery and a photovoltaic module, relates to the technical field of photovoltaic, and aims to improve the double-sided rate and the working performance 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 passivation layer. The first doped semiconductor layer is disposed on the first region. The first doped semiconductor layer is an emitter doped layer. The second doped semiconductor layer is disposed on the second region. The conductive types of the second doped semiconductor layer and the first doped semiconductor layer are opposite. A passivation layer is disposed on the first doped semiconductor layer, the second doped semiconductor layer, and the spacer region. Wherein the spacer region includes a first sub-region adjacent to the first doped semiconductor layer, and a second sub-region adjacent to the second doped semiconductor layer. In a side of the passivation layer facing away from the semiconductor substrate, a surface reflectance of a portion corresponding to the first sub-region is less than a surface reflectance of a portion corresponding to the second sub-region.

A back-contact battery and a manufacturing method therefor, which relate to the technical field of photovoltaics, and are used for reducing the number of defects on a second surface side and improving the photoelectric conversion efficiency of the back-contact battery. The back-contact battery comprises: a semiconductor substrate, a first doped semiconductor layer, an intrinsic semiconductor layer and a second doped semiconductor layer. The first doped semiconductor layer comprises a first doped part and a second doped part, wherein the first doped part is located on a first region, and the second doped part is located on an isolation region; and the doping concentration of impurities in the second doped part is lower than that of impurities in the first doped part. The intrinsic semiconductor layer is formed on the part of the isolation region outside the second doped part in a direction parallel to a second surface. The second doped semiconductor layer covers a second region, the electrical conduction type of the second doped semiconductor layer is opposite to the electrical conduction type of the first doped semiconductor layer, and the intrinsic semiconductor layer is used for electrically isolating the first doped semiconductor layer from the second doped semiconductor layer.

The invention discloses a distributed photovoltaic and energy storage cooperative power distribution network voltage fluctuation suppression method and system, and relates to the technical field of voltage fluctuation suppression, and the method comprises the following steps: building an inter-node disturbance propagation accessibility matrix based on the real-time operation data of a power distribution network, and recognizing a voltage disturbance path set; constructing a disturbance irreversible structure chart based on the voltage disturbance path set, and identifying a one-way amplification chain; according to historical disturbance data of a unidirectional amplification chain source node, calculating a disturbance excitation probability and generating a disturbance active propagation domain; constructing an energy storage intervention buffer area in the disturbance active propagation domain; in the energy storage intervention buffer area, the reverse blocking capability of energy storage is evaluated by simulating disturbance propagation, and a collaborative strategy activation condition is generated. Through disturbance path simulation evaluation, energy storage redundancy configuration and power consumption are reduced, and the suppression efficiency and adaptability of the system are improved.

The present application discloses a back contact battery and a manufacturing method therefor, relates to the technical field of photovoltaics, and reduces the carrier recombination rate on one side of a first surface in a back contact battery. The back contact battery comprises: a semiconductor substrate, a first doped semiconductor layer, and a second doped semiconductor layer. In a direction from a second surface to a first surface, a surface of a second region is lower than a surface of a first region, forming a recess structure. Along the arrangement direction of the first region and the second region, a side face of the recess structure is provided with a first sub-region and a second sub-region which are continuously distributed, and the second sub-region is close to the first region. The surface of the first sub-region is inclined relative to the surface of the first region, and the cross-sectional area of a part of the first sub-region of the recess structure gradually increases in the direction away from the first surface. The surface of the second sub-region is a plane. The first doped semiconductor layer is located on at least part of the first region. The second doped semiconductor layer is located on the second region, and extends to above a part of the first region.

The embodiment of the invention discloses a power distribution network operation optimization method and device, equipment and a storage medium, and the method comprises the steps: constructing a multi-period second-order cone optimal power flow model of a power distribution network, and solving to obtain a multi-period operation optimal solution of the power distribution network; converting the optimization problem of the second-order cone optimal power flow model into a Markov decision process to obtain a Markov decision model; determining a target state corresponding to the optimal solution of multi-period operation of the power distribution network, and constructing a pre-training data set based on the optimal solution and the corresponding target state; and pre-training the decision-making agent by using the pre-training data set, training the pre-trained decision-making agent by using an algorithm in reinforcement learning based on the Markov decision-making model, and outputting an optimal power distribution network multi-period operation strategy. The distributed photovoltaic bearing capacity can be effectively improved, the overall optimization efficiency is improved, and the problem of poor dynamic scene adaptation is effectively solved.