40results about How to "Inhibition of PID effect" patented technology

The invention discloses a PID-resistant encapsulation adhesive film used for a photovoltaic cell. The PID-resistant encapsulation adhesive film comprises, by mass, polyolefin resin 80%-95%, polyhedral oligomeric silsesquioxane 1%-20%, a peroxide crosslinking agent 0.1-2%, an auxiliary crosslinking agent 0.01-1%, a light stabilizing agent and an ultraviolet absorber, wherein the polyolefin resin is an ethylene/alpha-olefin copolymer or a composition of the ethylene/alpha olefin copolymer; the polyhedral oligomeric silsesquioxane contains a hydrolysable radical which is selected from one or more of a methoxy group, an ethoxy group, a methoxyethoxy group and an acetoxyl group. The PID-resistant encapsulation adhesive film has good adhesive performance and ageing-resistant performance while having excellent PID-resistant performance, thereby having positive practical significance.

The invention discloses a method and circuit for detecting insulation resistance. A controller controls turn-on and turn-off of a PID suppression circuit and then controls turn-on and turn-off of the circuit for detecting insulation resistance, and then insulation resistance against the ground of a cell panel can be detected; whether the insulation resistance against the ground of the cell panel is larger than a preset value or not is judged; when it is judged that the insulation resistance against the ground of the cell panel is smaller than or equal to the preset value, insulation resistance faults are reported; when it is judged that the insulation resistance against the ground of the cell panel is larger than the preset value, an inverter is controlled to be started, then the PID suppression circuit is controlled to be turned on, and then suppression of the PID effect is achieved. Detection on the insulation resistance against the ground of the cell panel is achieved before grid connection of the inverter, the function of suppressing PID is achieved, and the problems in the prior art are solved.

The invention discloses a PID (potential induced degradation) resistible solar cell passivated antireflective film. The PID resistible solar cell passivated antireflective film can be of two structures. One structure includes that the bottom layer of the passivated antireflective film is a passivated antireflective layer SiNx with refraction rate 2.0-2.1 and the thickness ranging from 70nm to 80nm; and the top layer of the passivated antireflective film is a conductive amorphous silicon layer with the thickness ranging from 3nm to 10nm. The other structure includes that the bottom layer of the passivated antireflective film is a passivated layer SiNx with the refraction rate 2.2-2.3 and the thickness ranging from 9nm to 11nm; an intermediate layer of the passivated antireflective film is a conductive amorphous silicon layer with the thickness ranging from 3nm to 10nm; and the top layer of the passivated antireflective film is an antireflective layer SiNx with refraction rate 2.0-2.1 and the thickness ranging from 60nm to 70nm. A battery end of a solar battery with the passivated antireflective film can effectively prevent PID effect. Further, based on existing conventional battery process, combination of ingredients and thickness of the antireflective film can be changed only, the antireflective film can be compatible with existing battery process and easy to realize. The PID resistible solar cell passivated antireflective film is applicable to conventional P-type batteries and also applicable to efficient back-passivation batteries, EWT (emitter wrap through) batteries, MWT (metal wrap through) batteries, and N-type IBC (interdigitated back contact) batteries and the like.

The invention provides an achieving method for preventing photovoltaic cell panel PID effect. The method comprises the steps that first, a PID effect energy recovering unit is established; second, when voltages of N photovoltaic cell pack strings sampled by the PID effect energy recovering unit are lower than a set threshold value, the PID effect energy recovering unit is cut into a photovoltaic generating system; and any photovoltaic cell pack string voltage of the N photovoltaic cell pack string voltages sample by the PID effect energy recovering unit is larger than the set threshold value, the PID effect energy recovering unit is cut out of the photovoltaic generating system. Under the premise that working of a photovoltaic inverter is not affected, the problem of photovoltaic cell panel output power attenuation caused by a photovoltaic cell component PID phenomenon is solved.

The invention provides a novel non-metallic photovoltaic module and an assembling process thereof. The novel non-metallic photovoltaic module comprises a photovoltaic module and a solar module insulated frame for fixing the photovoltaic module, wherein a composite material is adopted to be subjected to pultrusion to form the solar module insulated frame; and the photovoltaic module and the solar module insulated frame are bonded into an integrated structure by adopting an adhesive layer at the joint place. The structure is delicate; the process is concise; the photovoltaic module and the insulated frame formed by adopted the composite material through pultrusion are combined to form the photovoltaic module, no stop bar exists on the front face of the module frame, no accumulated dust exists in the bottom of the front face of the module, no hot spot effects are generated, and the service life of the module is prolonged, and the power generation amount of the module is ensured; and, as the insulated frame of the module adopts the composite material, no PID phenomenon is generated, the module efficiency and the service life are not reduced in the case of long-time power generation work of the module, and the cost of the whole system is reduced.

The invention discloses a novel anti-PID device. The novel anti-PID device adopts a three-phase power grid for power supply, and is characterized by being connected with an AC output end of a power supply of an inverter; a virtual midpoint is constructed through inductance and resistance; output of an anti-PID controller is connected between the virtual midpoint and the ground to provide isolationvoltage output, sampling power supply and logic comparison level; the anti-PID controller increases voltage to ground of the virtual midpoint; when the inverter is connected to the grid, the voltageto ground of a PV battery panel is increased, so as to inhibit the generation of a PID effect. The device has the advantages of inhibiting the PID effect and being low in power consumption and good instability, accords with safety standard requirements, and is capable of greatly enhancing the power generation efficiency of photovoltaic grid-connected systems and prolonging the service life of thesystems.

The invention discloses an anti-PID device, an anti-PID photovoltaic grid-connected power generation system and an anti-PID method. The anti-PID device is applied to a direct current-side ungrounded photovoltaic grid-connected power generation system. The anti-PID device includes a data acquisition device, an adjustable voltage source and an equivalent circuit, wherein the data acquisition device is used for acquiring negative busbar voltage to earth of each photovoltaic inverter in a grid-connected operation state, the equivalent circuit is used for constructing an equivalent neutral point of the photovoltaic grid-connected power generation system, the adjustable voltage source is used for selecting out the minimum value of the negative busbar voltage to earth which is transmitted by the data acquisition device in real time; the electric energy output end of the adjustable voltage source is connected with the equivalent neutral point constructed by the equivalent circuit; when the minimum value of the negative busbar voltage to earth is a negative value, the adjustable voltage source boosts the output voltage to earth of the adjustable voltage source itself until the minimum value of the negative busbar voltage to earth becomes a non-negative value. With the anti-PID device, the anti-PID photovoltaic grid-connected power generation system and the anti-PID method adopted, a photovoltaic panel will not generate a PID effect.

The invention relates to the field of photovoltaic packaging materials and particularly relates to an illite/smectite clay containing anti-PID functional master batch for a photovoltaic packaging filmand a preparation method for the illite/smectite clay containing anti-PID functional master batch. The master batch is prepared from the following ingredients in percentage by weight: 50% to 88% of EVA resin, 4% to 20% of modified zirconium phosphate crystal, 0.5% to 10% of cross-linker, 0.5% to 2.5% of silane coupler, 5% to 15% of nano illite/smectite clay and the balance of auxiliaries. According to the illite/smectite clay containing anti-PID functional master batch for the photovoltaic packaging film and the preparation method for the illite/smectite clay containing anti-PID functional master batch, the defect in the prior art that master batches for photovoltaic packaging films do not have an anti-PID function and thus performance of batteries is low is overcome; the illite/smectiteclay containing anti-PID functional master batch for the photovoltaic packaging film, prepared by the method, has a good anti-PID function; meanwhile, a top-class flame-retardant effect is achieved under the condition of not additionally adding flame retardants; and furthermore, the illite/smectite clay containing anti-PID functional master batch further has the advantages that the antibacterial and mildewproof effect is good, meanwhile, toxic and harmful substances in the functional master batch can be remarkably reduced, and the like.

The invention discloses a photovoltaic module based on a slide-in track. The photovoltaic module comprises a support frame and a photovoltaic power generation panel, wherein the support frame comprises a base, a support column and a mounting plate; two first hydraulic oil cylinders in conjunction are arranged on the left side of the support column; two second hydraulic oil cylinders in conjunctionare arranged on the right side of the support column; a slide rail is arranged on the mounting plate; the photovoltaic power generation panel includes a frame and a photovoltaic module body; the outer side of the vertical plate of the frame is provided with a slide block structure having a T-shaped cross section; The photovoltaic module body comprises a tempered glass layer, a quartz glass layercontaining a rare earth europium ion complex, a high-volume-resistivity EVA film, a solar panel, an EVA film, a heat dissipation sheet and a high-strength steel wire mesh. The support frame can be adjusted timely to make the photovoltaic module body face the sun, thereby achieving high power generation efficiency, simple structure and low cost. The photovoltaic module suppresses a PID effect, hasa good heat dissipation effect, high photoelectric conversion efficiency, a thin thickness, high strength, and a long service life.

The invention relates to an anti-PID (Potential Induced Degradation) assembly and a manufacturing method thereof. The anti-PID assembly comprises front panel glass, a first packaging layer, at least one photovoltaic solar cell, a second packaging layer, a backplane and an assembly frame, wherein ultrathin two-dimensional electrical nano material layers are arranged between the front panel glass and the first packaging layer and between the second packaging layer and the backplane; and the side edges of the ultrathin two-dimensional electrical nano material layers are connected with the assembly frame. The ultrathin two-dimensional electrical nano material layer is adopted as an insertion layer of a solar module, the layer has strong absorbability, good conductivity and high transmittance and can thus play a good role of adsorbing ions, the ions are transferred to the assembly frame, and thus, accumulation of charges on the surface of the cell caused by ion migration to generate PID effects can be avoided; and due to the high transmittance, application of the two-dimensional nano material can be ensured not to affect the performance of the solar module.

The invention relates to a double-glass double-faced photovoltaic car shed power generation system with a rainproof function. The system comprises a bracket, a purlin, a double-glass double-faced photovoltaic module and a charging box, wherein the purlin is arranged on the bracket; the double-glass double-faced photovoltaic module is arranged on the purlin; and the charging box is connected with the double-glass double-faced photovoltaic module and is used for charging the vehicles. The double-glass double-faced photovoltaic car shed power generation system has the rainproof and power generation functions at the same time, so that the efficient utilization of space is realized and the power generation cost is reduced; due to the rainproof protection, the service life of the charging box can be effectively prolonged.

The invention discloses a high-frequency isolation inverter and a solar power generating system. The high-frequency isolation inverter comprises a booster circuit connected with a solar power generating device and conducting filtering and pumping on direct voltage output by the solar power generating device, a high-frequency isolation circuit connected with the booster circuit and conducting direct-current isolation conversion on the voltage output by the booster circuit, and an inversion circuit connected with the high-frequency isolation circuit and conducting inverting transformation and filtering on the output voltage of the high-frequency isolation circuit and then outputting alternating current. The high-frequency isolation inverter can effectively inhibit common-mode leakage currentof a thin film module power generating system and prevent the PID effect of a glass-based thin film module and is small in occupied area, low in cost and convenient to install.

The invention relates to a potential induced degradation prevention circuit and a photovoltaic system using the same. The potential-induced degradation prevention circuit comprises a rectifier and a DC/DC converter. The input end of the rectifier is connected with the output end of the inverter, and the rectifier is provided with a positive output port, a negative output port and a voltage midpoint port. And the input end of the DC/DC converter is connected with the positive output port and the negative output port of the rectifier, and the output end of the DC/DC converter is connected to the voltage midpoint port of the rectifier and the ground respectively, and is used for raising the PV-to-ground voltage of the photovoltaic module when the inverter works so as to enable the PV-to-ground voltage to be greater than or equal to 0V. The photovoltaic system comprises a photovoltaic module, an inverter, an isolation transformer and the potential induced degradation prevention circuit. The circuit is simple in structure and reliable in performance, the PID effect of the photovoltaic module can be effectively prevented, meanwhile, the site construction complexity of a power station is reduced, the manual input of the system is reduced, and the operation and maintenance cost is reduced.

The invention relates to a photovoltaic module, which comprises a photovoltaic back plate, a first packaging adhesive layer, a solar cell, a second packaging adhesive layer and a transparent cover plate which are stacked in sequence, wherein the volume resistivity of the first packaging adhesive layer and the volume resistivity of the second packaging adhesive layer are not less than 1.2*1014omega.cm. According to the photovoltaic module, by arranging the first packaging adhesive layer and the second packaging adhesive layer, which are high in volume resistivity, at two sides of the solar cell, the PID (potential induced degradation) effect can be effectively avoided, and therefore power attenuation cannot be caused even if the reverse bias phenomenon occurs in a photovoltaic module system during the operation of a photovoltaic power station, and the output power and the generating effect of the photovoltaic module are further ensured.

Disclosed is a method for preparing a crystalline silicon solar cell. The method comprises the following steps: (1) cleaning the surface of a silicon slice, and performing texturing, diffusion, junction making and edge etching on the surface of the silicon slice; (2) forming a layer of silicon dioxide dielectric film on a light-receiving surface or a double surfaces of the silicon slice, the thickness of the layer of silicon dioxide dielectric film is 1.0 to 10 nm; and (3) performing antireflective film coating, silk-screen printing and sintering to obtain the crystalline silicon solar cell. In this way, a method for preparing a crystalline silicon solar cell resisting potential induced degradation is developed. The formed silicon dioxide dielectric film well blocks ion migration, prevents the ion migration from damaging a PN junction and effectively restrains a PID effect and can meet requirements on a PID Free cell plate.