16 results about "Potential induced degradation" patented technology

The invention relates to the field of photovoltaic cell packaging adhesive films, and provides an anti-PID type EVA adhesive film which comprises EVA resin, a cross-linking agent, a first assistant cross-linking agent, a second assistant cross-linking agent and a functional aid, and is characterized in that the second assistant cross-linking agent is composed of high-functional-group acrylate and monofunctional-group acrylate, the unsaturated double-bond functional group of the high-functional-group acrylate is greater than or equal to 3, and the unsaturated double-bond functional group of the monofunctional-group acrylate is greater than or equal to 3; monofunctional acrylate comprises isobornyl acrylate, high-functional-group acrylate and monofunctional-group acrylate which are compounded, and the monofunctional-group acrylate not only can reduce the viscosity of the high-functional-group acrylate, but also has certain swelling property on matrix resin, so that the compatibility of the high-functional-group acrylate and the matrix resin can be enhanced; and absorption and uniform dispersion of the high-functional-group acrylate in the matrix resin are facilitated, so that the compactness of the EVA adhesive film after crosslinking is improved, and the anti-PID effect of the EVA adhesive film is improved.

The present disclosure relates to novel encapsulant film compositions that provide anti-PID properties while maintaining good cure, adhesion, volume resistivity properties. The composition comprises: a) a polyolefin polymer; b) an organic peroxide; c) a silane adhesion promoter; and d) a crosslinking aid; and e) an anti-PID agent.

The utility model provides an anti-potential-induced-degradation circuit and a photovoltaic power generation system, and relates to the technical field of photovoltaic power generation. The anti-potential-induced-degradation circuit comprises a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises a first switching element and a primary side winding of a transformer; the secondary circuit comprises a secondary winding of the transformer; the first end of the second switch piece is connected with the first end of the secondary winding; the first end of the first energy storage element is connected with the second end of the second switch piece, and the first end of the first energy storage element is connected with the negative electrode of the photovoltaic module; the first end of the second energy storage element is connected with the second end of the first energy storage element, and the second end of the second energy storage element is connected with the grounding end of the photovoltaic module; the first end of the third switch piece is connected with the second end of the second energy storage element, and the second end of the third switch piece is connected with the first end of the secondary winding. According to the invention, the size and the cost of the anti-potential-induced-attenuation circuit are reduced, and the anti-electromagnetic interference capability of the transformer is also improved.

The invention relates to a photovoltaic module, in particular to a photovoltaic module with an anti-PID (Potential Induced Degradation) sealing film with a good oxygen and Na < + > ion blocking effect. The anti-PID packaging adhesive film at least comprises a layer of matrix resin and a PVA (Polyvinyl Alcohol) layer. Polyvinyl alcohol (PVA; according to the present invention, the combination of the Poly (vinyl alcohol) and the matrix resin can provide excellent oxygen resistance and PID resistance, such that the time limit of the assembly using the packaging adhesive film can be prolonged.

The invention discloses a photovoltaic glass coating and a preparation method thereof, photovoltaic glass and a photovoltaic module, and relates to the field of photovoltaic glass, the photovoltaic glass coating comprises a silicon dioxide cross-linked network, and hydrolytic polymaleic anhydride and modified graphene bonded on the silicon dioxide cross-linked network; the modified graphene is a chitosan-single-layer graphene oxide compound formed by single-layer graphene oxide and chitosan with the deacetylation degree of 65 to 75 percent. According to the preparation method, hydrolytic polymaleic anhydride and specific modified graphene are introduced into a silicon dioxide cross-linked network, so that the high light transmittance of the photovoltaic glass is ensured, the potential induced degradation resistance and the aging resistance of the photovoltaic glass are remarkably improved, the strict requirements of the photovoltaic field on the photovoltaic glass can be met, and the application prospect is wide. And a key material support is provided for research and development of a new-generation efficient photovoltaic module.

The utility model provides a potential induced degradation repairing device and a photovoltaic power generation system. The device is connected with the alternating current end of an inverter in the photovoltaic power generation system. The device comprises a rectification unit, a positive DC bus, a negative DC bus, a virtual neutral point, a first capacitor, a second capacitor, a third capacitor, a bus selection unit, a voltage regulation unit and a control unit. The control unit is connected with the rectification unit, the bus selection unit and the voltage regulation unit. The potential between the bus and the functional ground is increased through the voltage regulating unit and the bus selection unit, so that the potential to ground of the middle point BUSN or the alternating current end of the inverter is changed, and the potential to ground of the negative electrode or the positive electrode of the photovoltaic module is indirectly increased; the compatibility and reliability of the system are improved, the cost of the system is not increased, and centralized management and maintenance are facilitated.

The present disclosure provides a PID (Potential Induced Degradation) effect suppression system. The PID effect suppression system includes a photovoltaic system, at least one voltage source topology module and a balanced circuit. The photovoltaic system is connected with a power grid. An output end of the voltage source topology module is connected with busbar neutral points of the photovoltaic system. A common earth end of the voltage source topology module is earthed, and then the potential to earth of a photovoltaic panel group in the photovoltaic system is improved through the suppression voltage output by the voltage source topology module, and the suppression voltage is greater than ½ of the output voltage of the photovoltaic panel group. Therefore, a PID effect of the photovoltaic system in operation can be effectively suppressed. When the voltage source topology module gets power from busbars, the balanced circuit can be connected between the output end of the voltage source topology module and the common earth end. If deviation occurs on the busbar voltage of the photovoltaic system, the balanced circuit is connected with the voltage source topology module, so that the deviation voltage generated by the busbars can be effectively balanced to ensure normal operation of the photovoltaic system under the suppression of the PID effect.

Provided are a potential induced degradation (PID) repair circuit and PID repair method for a photovoltaic (PV) system. The PV system includes a solar cell module, an energy storage module, a direct current direct current (DCDC) boost circuit, and an inverter circuit; the PID repair circuit includes a DC power supply and an isolation circuit; after the DC power supply is processed by the isolation circuit, one end of the isolation circuit is connected to a positive terminal PV+ or a negative terminal PV- of the solar cell module, and another end of the isolation circuit is connected to a ground terminal PE; and a first switch is disposed on a connection path between the solar cell module and the energy storage module; PID repair is performed on the solar cell module by applying a negative voltage to the positive terminal PV+ of the solar cell module or a positive voltage to the negative terminal PV- of the solar cell module via the DC power supply; and a connection path between the solar cell module and the inverter circuit is disconnected during the PID repair. This application can prevent an internal short circuit caused by the inverter circuit during the PID repair, thereby effectively guaranteeing the operational safety of the PV system.

The invention relates to an adhesive film, a preparation method thereof and a photovoltaic module. The adhesive film is prepared from the following raw materials in parts by mass: 20 to 55 parts of base material monomer, 1 to 10 parts of curing agent, 12 to 40 parts of oligomeric resin, 5 to 10 parts of refraction particles, 0.1 to 5 parts of grafting auxiliary agent, 0.1 to 5 parts of hydrolysis-resistant auxiliary agent and 0.1 to 5 parts of PID (Potential Induced Degradation)-resistant auxiliary agent. The adhesive film provided by the invention can improve the water resistance and PID resistance of the photovoltaic module while having relatively high optical transmittance, so that the service life of the photovoltaic module is prolonged.

The invention discloses a battery piece test method, which comprises the following steps of: performing electrical performance test on a battery piece to obtain a first test result; a photovoltaic sample piece is prepared based on the battery piece, and the photovoltaic sample piece comprises a first protection piece, a first adhesive film, the battery piece, a second adhesive film and a second protection piece which are sequentially stacked; performing a potential-induced degradation test on the photovoltaic sample piece; after the potential induced degradation test is completed, taking out the battery piece in the photovoltaic sample piece, and carrying out the electrical performance test on the battery piece again to obtain a second test result; and according to the first test result and the second test result, determining the anti-potential-induced-degradation performance of the battery piece. In the embodiment of the invention, the components in the photovoltaic sample piece are not connected, so that after the PID test of the photovoltaic sample piece is completed, the components in the photovoltaic sample piece can be completely separated, and the battery piece in the photovoltaic sample piece can be rapidly and completely taken out to test the PID resistance of the battery piece.

The invention relates to the technical field of attenuation detection of photovoltaic modules, and discloses a potential-induced attenuation detection method of a photovoltaic module, which comprises the following steps: by taking a module packaging layer of the photovoltaic module as a working electrode, measuring the ion mobility of the module packaging layer of the photovoltaic module with different potential-induced attenuation rates through a preset standard electrochemical measurement process; constructing a migration rate-attenuation rate correlation model of the photovoltaic module; measuring the ion mobility of the to-be-measured photovoltaic module through a preset standard electrochemical measurement process by taking the module packaging layer of the to-be-measured photovoltaic module as a working electrode; substituting the ion mobility of the to-be-detected photovoltaic module into the mobility-attenuation rate correlation model, and calculating a potential-induced attenuation rate quantized value of the to-be-detected photovoltaic module; and judging the attenuation grade of the to-be-detected photovoltaic module according to the grade judgment threshold range in which the quantized value of the potential-induced attenuation rate of the to-be-detected photovoltaic module falls. According to the method, quantitative rating of the PID fault degree of the photovoltaic module can be realized with relatively low cost and relatively high efficiency.

Embodiments of the present application provide a power supply system. By means of cascade of output ends of power supplies or DC-DC units, the output voltage is increased, the current between the power supplies or DC-DC units and DC-AC units is decreased, and the problems of costs and losses of cables from the power supplies or DC-DC units to the DC-AC units are solved. Moreover, the power supply system provided by the embodiments of the present application can also reduce the number of the cables from the power supplies or DC-DC units to the DC-AC units by means of cascade of the output ends of the power supplies or DC-DC units and input cascade of the DC-AC units, thereby reducing system costs. Moreover, in the power supply system provided by the embodiments of the present application, the input cascade and output isolation of the DC-AC units can reduce the specifications of a power conversion device. The problems of inadequate specifications and high cost of power conversion devices in existing industry are solved. In addition, the power supply system provided in some embodiments can also solve the problem of Potential Induced Degradation (PID) caused by a negative voltage of a battery plate to the ground when the system is running.

The application provides a power equipment defect identification method and system based on machine vision, relates to the technical field of equipment defect identification, and comprises the following steps: through an imaging device carried by a drone, standard electroluminescence images, standard infrared thermal images and standard visible light images of a target photovoltaic module string are collected and preprocessed under different time windows, and environmental parameters of each collection are recorded; visual defect features and attenuation gradient features in the standard electroluminescence images are analyzed, the standard infrared thermal images, the standard visible light images and electrical performance data are combined and verified, and a final diagnosis of potential induced degradation is obtained; for the photovoltaic module string diagnosed as having potential induced degradation, the evolution rate of the potential induced degradation is evaluated by using a time series analysis method based on the environmental parameters, and a risk level of the potential induced degradation is mapped and generated; and a structured defect identification report is generated. The accuracy of power equipment defect identification is improved.

The application provides a photovoltaic module front plate and a preparation method and application thereof, and the photovoltaic module front plate comprises a fluoroplastic film, a glass fiber adhesive film composite layer and a barrier layer which are sequentially stacked; the glass fiber adhesive film composite layer comprises a first cutting adhesive film, a glass fiber layer and a second cutting adhesive film which are sequentially stacked; and the fluoroplastic film is attached to the surface of the first cutting adhesive film away from the glass fiber layer. Through the design of the structure of the photovoltaic module front plate and the materials of each layer, the hardness of the photovoltaic module front plate is improved, the water vapor transmission rate and the potential induced degradation in the photovoltaic module are effectively reduced, the internal structure of the photovoltaic module is protected, and the service life is prolonged; in addition, the photovoltaic module front plate provided by the application has the characteristics of light weight, the weight of the photovoltaic module can be reduced, and the photovoltaic module is convenient to install and transport.

The present disclosure provides a PID (Potential Induced Degradation) effect suppression system. The PID effect suppression system includes a photovoltaic system, at least one voltage source topology module and a balanced circuit. The photovoltaic system is connected with a power grid. An output end of the voltage source topology module is connected with busbar neutral points of the photovoltaic system. A common earth end of the voltage source topology module is earthed, and then the potential to earth of a photovoltaic panel group in the photovoltaic system is improved through the suppression voltage output by the voltage source topology module, and the suppression voltage is greater than ½ of the output voltage of the photovoltaic panel group. Therefore, a PID effect of the photovoltaic system in operation can be effectively suppressed. When the voltage source topology module gets power from busbars, the balanced circuit can be connected between the output end of the voltage source topology module and the common earth end. If deviation occurs on the busbar voltage of the photovoltaic system, the balanced circuit is connected with the voltage source topology module, so that the deviation voltage generated by the busbars can be effectively balanced to ensure normal operation of the photovoltaic system under the suppression of the PID effect.

The invention discloses a photovoltaic coating, a photovoltaic cell, a photovoltaic module and a preparation method of the photovoltaic cell. The photovoltaic coating is formed by curing a composition comprising the following components in parts by weight: 45-55 parts of a prepolymer; 25 to 35 parts of a reactive diluent; 3 to 5 parts of a photoinitiator; and 2-4 parts of an ultraviolet light absorber. According to the invention, by directly forming the coating with ultraviolet ray isolation and high light transmittance on the surface of the battery piece, excellent ultraviolet ray protection is provided for the battery piece while the performance of the packaging adhesive film is not influenced, and a potential induced degradation (PID) effect induced by ultraviolet ray radiation is synergistically inhibited. The coating composition for forming the photovoltaic coating is optimized and can be quickly cured in an air atmosphere, so that the production efficiency is greatly improved, and the dependence on inert gas is reduced; meanwhile, precise coating processes such as ink-jet printing and the like are adopted, so that the high utilization rate of the material is realized, and the manufacturing cost is remarkably reduced.