Computational approach to assess the impact of two-dimensional concentrators on the electrical performance of concentrated photovoltaic systems

Abstract

The invention provides a calculation method for evaluating influences on electrical performances of a concentrating photovoltaic system by a two-dimensional light condenser. The calculation method comprises: aiming at a solar concentrating photovoltaic system adopting the two-dimensional light condenser, dispersing in a direction where concentrating solar energy flows are not uniformly distributed on a crystal silicon photovoltaic battery, so as to form a plurality of dispersing units; according to an equivalent circuit of a polycrystalline silicon photovoltaic battery, forming a two-dimensional multi-diode calculation model with the plurality of parallel dispersing units; converting dispersed two-dimensional concentrating solar energy flows into short-circuit current and correspondingly setting the short-circuit current into a dispersed unit constant-current source of the two-dimensional multi-diode calculation model; then establishing an imaging procedure by adopting an iteration method or Multisim software and calculating output electric energy of a two-dimensional concentrating photovoltaic-thermal system, so that the influences on the concentrating photovoltaic system, caused by the two-dimensional light condenser, are evaluated.

Description

technical field [0001] The invention belongs to the field of solar concentrating photovoltaic research, and relates to a calculation method for evaluating the influence of a two-dimensional concentrator on the electrical performance of a concentrating photovoltaic system. Background technique [0002] In the solar concentrating photovoltaic system, the optical performance of the concentrator has a great influence on the electrical performance of the system. The optical performance of the concentrator includes two aspects: the optical efficiency of the concentrator and the uniformity of the concentrated solar energy flow of the concentrator. The optical efficiency characterization The "quantity" of the light collected by the concentrator, and the uniformity of the light concentrating characterizes the "quality" of the light collected by the concentrator. Usually, the concentrators with the same optical efficiency have different light concentrating uniformity, which makes the o...

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Problems solved by technology

[0002] In the solar concentrating photovoltaic system, the optical performance of the concentrator has a great influence on the electrical performance of the system. The optical performance of the concentrator includes two aspects: the optical efficiency of the concentrator and the uniformity of the concentrated solar energy flow of the concentrator. The optical efficiency characterization The "quantity" of the light collected by the concentrator, and the uniformity of the light concentrating characterizes the "quality" of the light collected by the concentrator. Usually, the concentrators with the same optical efficiency have different light concentrating uniformity, which makes the output power of the system The performance is different; due to the existence of uniformity of light concentration, too high local solar energy irradiates onto the photovoltaic cell, which makes the local current of the photovoltaic cell too high, resulting in the partial I of the photovoltaic cell 2 The increase in R loss makes the electric energy generated by the photovoltaic cell excessively consumed locally, thereby reducing the electrical performance of the entire concentrated photovoltaic system. In addition, due to the high local solar current irradiation, the resistance value of the photovoltaic cell in this area is relatively high. High, unable to meet the task of transporting electric energy under the corresponding high current density, which leads to local I of photovoltaic cells 2 R losses increase, thereby reducing the electrical performance of the entire CPV system

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