The Study On High Efficiency Membrane Concentration Photovoltaic In Space

With the increasing human demands for energy sources and exhaust of fossilfuels, the exploitation of solar energy in space is becoming the priority research areasin the earth and space science. Concentration photovoltaic (CPV) technique isintegrated with a large aperture concentrator in place of plane solar cells, whichdevelops toward high efficiency as the key technique of solar energy in spacecollection and transformation. As lightweight, inexpensive, high-performancestructures, membrane concentrators are excellent candidates for space-deployablecollection device. However, current membrane CPV system results in low stabilityand efficiency-mass ratio and shadow of solar cells and thus degrades the system’sperformance, which makes space-based applications of the membrane CPV systemlimited. Thus, according the above problems this thesis researches high efficiencyspace-based membrane CPV system, which offers a series of solutions and a novelview for application of membrane CPV system.Firstly, coupling with a membrane reflective error probability model, wecomprehensively consider the influences of parameter of space-based membrane CPVsystem on the flux radiation distributions at the received plane. The influences ofreflective error of membrane concentrator、focal-diameter ratio、the shadow ofreceivers and the receiver location on radiation flux density distributions is analyzed by using monte-carlo ray-tracing method. The simulation results present a referencefor space-based application of membrane CPV system. Then based on theoreticalmodel, to validate the rationality of the membrane reflective error probability model,we built an experiment platform with membrane concentrator with aperture of180mmand conduct a concentrating experiment, and the measurement results demonstrate therationality of the membrane reflective error probability model.Secondly, to improve the stability of the membrane CPV system, the design of asolar dish concentrator is proposed based on triangular membrane facets for spacepower applications. With the goals of30kW of received power and300ofconcentration ratio, considering the system root-mean-square (RMS) deviation in thisdesign procedure, we achieve the minimal number of facets rows of membraneconcentrator, which degrades the complexity of membrane concentrator structure. Theproposed novel concentrator is supported by a deployable perimeter truss structureand offers the advantages of high stability and extensibility, which become thepotential alternate for the new general of space-based membrane concentrator.And then to enhance the uniformity of radiation flux distribution at the receivedplane of membrane CPV system, we proposed the arrangement and shapeoptimization model of solar concentrating cell. This optimization model aims at thehighest uniformity of radiation flux distribution, and makes the solar cell location andshape varied to realize the optimization process. The result indicates this optimizationmodel enhances the efficiency-mass ratio of membrane CPV system, and effectivelydecreases system launch cost, which provided an effective solution for practicalapplication of space-based membrane CPV system.At last, the shadow of the solar cell of membrane CPV system to the incidentsunlight results in the decrease of optical received efficiency, a novel hybrid receivercombined solar cell with a super-thin spectral-splitting CPV is proposed. Thesuper-thin spectral-splitting concentrator utilizes injected facets in light guide layersconcurrently redirect the focused beam, while acting as spectral splitting facets. Thespectral-splitting concentrator has the advantages of compact structure and low tracking requirement, and is conveniently integrated with membrane CPV system toenhance optical received efficiency.