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  • 权利要求
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    • 专利摘要:
    The present invention relates to a photovoltaic panel structure capable of reducing influence 5 of dust accumulation and a method for designing a photovoltaic panel structure. The method comprises: obtaining a dust accumulation sample, and measuring a particle size distribution function f(R) and a relative dielectric constant thereof; calculating a near field of particles subjected to electromagnetic waves by a Mie scattering theory, and the formula is as follows: obtaining scattered field data of particles with different particle sizes (R) under solar radiation with 10 a wavelength of A by simulation calculation, finding a corresponding distance r when field intensity is greater than a fixed value b, establishing a corresponding fitting function, and thereby calculating an average distance; and selecting ; as the thickness of photovoltaic glass, and assembling the photovoltaic panel structure accordingly. The present invention designs a photovoltaic glass structure by obtaining the physical property of local dust accumulation and the 15 power spectrum of solar radiation in advance, so as to realize high-efficiency power generation of photovoltaic cells.
    公开号:NL2027172A
    申请号:NL2027172
    申请日:2020-12-18
    公开日:2021-08-30
    发明作者:Qu Gaoqiang；Jiang Wenjing；Xue Yufeng；Ye Qing；Feng Pu；Su Chuan；Li Xingcai；Yao Qi；Wang Shaojie；Jin Panlong；Wang Lu
    申请人:State Grid Ningxia Electric Power Co Ltd Eco Tech Res Institute；Univ Ningxia；State Grid Ningxia Electric Power Co；
    IPC主号:
    专利说明:

    PHOTOVOLTAIC PANEL STRUCTURE CAPABLE OF REDUCING INFLUENCE OF DUST
    ACCUMULATION AND METHOD FOR DESIGNING PHOTOVOLTAIC PANEL STRUCTURE Technical Field The present invention relates to a photovoltaic panel structure capable of reducing influence of dust accumulation and a method for designing a photovoltaic panel structure. Background Clean, cheap and reliable energy has always been the cornerstone of social prosperity and economic growth, and the development of new energy is an irreversible trend in the world today. As the most mature clean energy technology, solar photovoltaic power generation plays a vital role in solving the problem of power shortage in any country. Effective prediction of photovoltaic panel generation efficiency plays an important role in grid-connected consumption of new energy; whereas under the influence of meteorological environment, accurate prediction of the temperature and effective solar radiation intensity of a photovoltaic panel directly affects the accuracy of relevant results. A desertification region is an advantageous region for developing large-scale photovoltaic power stations, but the atmospheric environment with wind, sand, strong radiation and large temperature difference brings a series of new problems to the normal operation of a photovoltaic system. Therefore, the research on the influence of desert environment on solar power generation devices has attracted wide attention.
    Aerosol particles may deposit on the surface of a photovoltaic solar panel and change the light transmittance of a protective layer of a photovoltaic cell, thus affecting the effective incident solar radiation intensity of the photovoltaic cell. Experimental study shows that: for a glass panel with an inclination angle of 45°, the light transmittance is decreased by 30% after 30 days of exposure in a rainless season, and is decreased with the increase of a cleaning cycle (as more sand and dust will deposit). It can be seen that sand and dust deposition has become a main factor affecting the economical and high-efficiency operation of a photovoltaic power station in the desertification region. Therefore, it is a research hotspot in the current field to explore a scientific dust removal method, design a better photovoltaic panel structure and effectively reduce the influence of dust accumulation.
    Summary The present invention discloses a new photovoltaic panel structure which can effectively reduce the negative influence of dust accumulation on a photovoltaic panel and can realize high- efficiency power generation by utilizing the special optical phenomenon of dust accumulation. The present invention is mainly to design a photovoltaic glass structure by obtaining the physical property of local dust accumulation and the power spectrum of solar radiation in advance, so as to realize efficient power generation of photovoltaic cells.
    The present invention provides a method for designing a photovoltaic panel structure, comprising: 1) Obtaining a dust accumulation sample, and measuring a particle size distribution function f(R) and a relative dielectric constant thereof, wherein R is a particle size, and the relative dielectric constant is obtained by an open cavity method and denoted as €; 2) Calculating a near field of particles subjected to electromagnetic waves by a Mie scattering theory, and the formula in a spherical coordinate system (r, 8%) is as follows: i 2 | er | : ES x E Ve Ey ah {15 PL kr kr | Ey 1 u ixexplik(r - 2] S00 I Li | Fe | ë ke 0 SLE, | ${2,6}= srl Abr JS LG} lg T+, } n=1, 2 3... TT and Th i sv, - nin +1 WR who FY 3 ggd 1) EE Ta 3 ; ; een can be solved iteratively by the following formula: x, = nl cösd.
    Ka” i” Tes) T= 20 aH em” etl} Ser gl | Hel TTo=0; TT1=1; TT2=3co88; T9=0; T:=cos8; and T:=3cos(28) x=KR, k is the number of the electromagnetic waves, k=2TT/ÀA, A is the wavelength of the electromagnetic waves, m = Jer , r is the distance from an investigation point to the center of the particles; and Ees and Ee are respectively a component of an incident wave in the spherical coordinate system. ow DL Lg Cin (nl) Tm malady COP 0 re} IES BAG nt ARE LAL LN] In the above formula, jn(x) and h(x) are respectively a spherical Bessel function of the first kind and a spherical Bessel function of the third kind, and [xjn(x;] means taking the derivative of the function in brackets with respect to x. 3) Obtaining scattered field data of particles with different particle sizes (R) under solar radiation with a wavelength of A by simulation calculation using formula (1), finding a corresponding distance r when field intensity is greater than a fixed value b, establishing a corresponding fitting function r=g(R), and thereby calculating an average distance; and the calculation formula is as follows: es SE (2)
    Wherein b is any constant greater than 1, and represents an enhancement multiple of the scattered field of particles in a direct radiation condition that can be guaranteed by the distance + obtained in formula (2), i.e., the multiple of the field intensity perceived by a photovoltaic cell and incident solar radiation; and 3 (4) Selecting ; as the thickness of photovoltaic glass, and assembling the photovoltaic panel structure accordingly.
    The method further comprises: (5) Determining the time for manual intervention in dust removal by measuring the geographic latitude and longitude of an installation region, and the specific steps are as follows: assuming that the geographic latitude of the region is §, a solar declination is 0, and a solar hour angle is t, then a solar elevation angle H is calculated by the following formula: sinH=singsind+cos@cosdcost Assuming that the median of particle sizes in this region is Ru, wherein Ru is output by a laser granularity meter in step 1, and the influence distance of the shadow of a single particle is L, then Li=2Rwmctg{Hs), L2=2Rwmctg{H+s), and the average of the two is used as an index, i.e., Lo=(L++L2)/2; Wherein Hs and H+s represent the time points of grid connection.
    The present invention further provides a photovoltaic panel structure obtained by the method.
    The present invention designs a photovoltaic glass structure by obtaining the physical property of local dust accumulation and the power spectrum of solar radiation in advance, so as to realize high-efficiency power generation of photovoltaic cells. Description of Drawings Fig. 1 shows a comparison of incident radiation intensities when the thickness of a photovoltaic panel is respectively 3 millimeter and 1.5 millimeter with respect to common dust particles having an average size of 20 microns. Detailed Description The following embodiments may enable those skilled in the art to fully understand the present invention, but do not limit the present invention in any way.
    The present invention is mainly to design a photovoltaic glass structure by obtaining the physical property of local dust accumulation and the power spectrum of solar radiation in advance, so as to realize efficient power generation of photovoltaic cells. A main method is: 4) Obtaining a dust accumulation sample, and measuring a particle size distribution function and a relative dielectric constant (or refractive index) thereof. The particle size distribution function can be obtained by measuring the collected dust accumulation sample by a laser granularity meter; and this function is denoted as f(R), wherein R is a particle size. The relative dielectric constant thereof can be measured by relevant instruments, such as an AS2855 high-frequency dielectric constant and dielectric loss measuring system, and is denoted as ¢..
    5) Calculating a near field of particles subjected to electromagnetic waves by a Mie scattering theory, and the formula is as follows: | i E J, : ES 3 Ei ~ HAY «|E ~ (1) PT kr kro Ey, 1 _ixexp Lkir-][s, 0] ] Ey 1 - Lv | . kr ” 2 0 Sy i | E, | Ca Zal ‚ n+l ; 5 x, 6 ar N mf ST + b 7 4 Ss xl Y= x ee XT / +h Eu 3 = Wherein 8 {x.8} dij GPP 3S {8 ) Lina ij GD} andn=1, 2,3. Ta and Tn can be solved iteratively by the following formula: da] 3 " a x, wl tn, - ez tn cosh Mint gl nl . me=0; TT:=1; TTe=3cos8; To=0; T:=co0588; and T2=3cos(28) x=kR, k is the number of the electromagnetic waves, k=21/A, A is the wavelength of the electromagnetic waves, m = Jz , r is the distance from an investigation point to the center of the particles.
    win on mrad loeit) ang fait
    EE Com mn ads ol oe {md} PIES Lat AE ASU LO A GSU Aen OPE Om (ee) In the above formula, jn{x) and BY {x} are respectively a spherical Bessel function of the first kind and a spherical Bessel function of the third kind, and [xjh{x)]' means taking the derivative of the function in brackets with respect to x. Other theories, such as discrete dipole approximation (DDA), T-matrix and finite difference method, can also be used here to calculate the near field of particles, and the fundamental purposes are the same: to calculate the near field distribution of particles under electromagnetic radiation.
    6) Obtaining scattered field data of particles with different particle sizes (R) under solar radiation with a wavelength of A by plenty of simulation calculation using formula (1), finding a corresponding distance r when field intensity is greater than a fixed value b (b> 1), establishing a corresponding fitting function r=g(R), and thereby calculating an average distance; and the calculation formula is as follows: ref" (R)g(RYAR (2) Wherein b is any constant greater than 1, and represents an enhancement multiple of the scattered field of particles in a direct radiation condition that can be guaranteed by the distance
    + Obtained in formula (2), i.e., the multiple of the field intensity perceived by a photovoltaic cell and incident solar radiation. (4) Selecting , as the thickness of photovoltaic glass, and assembling a photovoltaic panel accordingly.
    5 (5) Determining the time for manual intervention in dust removal by measuring the geographic latitude and longitude of an installation region. The specific method is as follows: assuming that the geographic latitude of the region is 4, a solar declination is ò, and a solar hour angle is t, then a solar elevation angle H is calculated by the following formula: sinH=singsind+cos@cosdcost Assuming that grid connection is required during the time period between 9:00 and 17:00 every day, then solar elevation angles are obtained, which are Hg and His. Assuming that the median of particle sizes in this region is Ru (which is automatically output by a laser granularity meter in step 1), and the influence distance of the shadow of a single particle is L, then Li=2Rwmctg(Hs), L2=2Rwmctg(H:s), and the average of the two is used as an index, i.e., Lo=(L:+L2)/2. Assuming that the area of the photovoltaic panel is A, then the number of dust particles deposited thereon shall not exceed 0.25A/L2, and the corresponding average distance between particles shall be n=2/R times a particle size, which can be automatically judged by a computer image processing method after a photograph is taken. Experiments show that with respect to common dust particles having an average size of 20 microns, when the thickness of the photovoltaic panel is decreased from 3 millimeter to 1.5 millimeter, the incident radiation intensity is increased by at least 10 times. The results are shown in Fig. 1, and the vertical axis is the amplification factor. Based on the above ideas, it is also possible to artificially design transparent microspheres and install the microspheres on the photovoltaic panel to achieve the same purpose. The radius ofthe microspheres is R as described above. Those skilled in the art should understand that the above embodiments are only exemplary embodiments and may be changed, replaced and amended in a variety of ways without departing from the spirit and scope of the present application.
    权利要求:
    Claims (3)
    [1]
    A method for designing a photovoltaic panel structure, the method comprising: 1) obtaining a dust accumulation sample and measuring a particle size distribution function f(R) and a relative dielectric constant thereof, where R is a particle size and the relative dielectric constant is obtained using an open-cavity method and is denoted as &; 2) calculating a scattered field of particles subjected to electromagnetic waves by a Mie scattering theory, where the formula is as follows: ov ES (no) ES (x6) gf = elnf) Fein) (1) u kr ke LE, ke 0 5{n0)] Ey re ‚ Za+l , xn dal Sx @)=Y fg x Ab TAS, je Vel zb TY, n=1, 2, 3. oe ) gint} "7 ob to ) Lol oe be where TT and Ta can be solved iteratively by the following formula: ES Fr ston, cme og awl YT Teen gosh © ng intl) sy To=0; T1=1; Me=3c0s8; T=0; T=co88; and 12=3c0s(20)x=kR, k stands for the number of the electromagnetic waves, k=2TT/A, A stands for the wavelength of the electromagnetic waves, m= Je , I stands for the distance from a research point to the center of the particles; and Eis and Ee are respectively a component of an incident wave in a spherical coordinate system; A NO (aed Bp BE a Bb and Bde Te meal OPH eg Dns]
    Aoba leg te] 3) obtaining scattered field data of particles of different particle size (R) under solar radiation with a wavelength of by simulation calculation using formula (1), finding a corresponding distance r when the field strength is greater than a fixed value b, determining a corresponding matching function r = g(R), and thereby calculating an average distance; where the calculation formula is as follows: ref {R)g(R}dR (2) where b is an arbitrary constant greater than 1, and represents a gain multiple of the scattered field of particles in a direct radiative state that can be guaranteed by the distance ; which is obtained in formula (2), ie the multiple of the field strength observed by a photovoltaic cell and the incident solar radiation; and 4) selecting + as the thickness of the photovoltaic glass, and assembling the photovoltaic glass accordingly photovoltaic panel structure.
    [2]
    The method of claim 1, further comprising: 5) determining the time for manual intervention in the dust removal by measuring the latitude and longitude of an installation area, wherein the specific steps are as follows: assuming the latitude and longitude of the area is ¢, a zone declination is ò, and a solar hour angle is t, then a solar elevation angle H is calculated by the following formula sinH = singsinò+cosqcosòcost, assuming that the median of the particle size in this area RM, where RM is given in step 1. by a laser granulate meter, and the influence distance of the shadow of a single particle is L, then Li = 2Rmctg(Hs), L2= 2Ructg(H+s}, using the average of the two as an index, ie Lo = ( Li+L2) / 2, where Hs and H:s represent the times of the grid connection.
    [3]
    A photovoltaic panel structure obtained by the method according to claim 1 or 2.
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010023178.3A|CN111222084B|2020-01-09|2020-01-09|Photovoltaic panel structure capable of reducing dust accumulation influence and method for designing photovoltaic panel structure|
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