光伏发电系统最大功率追踪控制研究
毕业论文关键词 光伏阵列 最大功率点 扰动观察法 定步长 变步长
Title Maximum Power Point Tracking Control of PV Systems
Abstract
Energy utilization ways reflect the degree of civilization of a society,
therefore, the energy problem has always been the focus of the social
development. However, with the development of economic, the demand for
energy is growing, the traditional energy sources dried up and the
increasingly serious environmental problems, make the world turned to the
new energy sector. The solar energy with its clean, widely distributed,
and huge reserves, recognized as an ideal alternative energy sources.
Photovoltaic solar energy, as a kind of effective way of solar energy
utilization, has been rapid development. But the conversion efficiency of
PV arrays is low, the cost is relatively high, the output characteristics
easily affected by environmental factors, all these problems restrict the
further promotion and development of photovoltaic power generation, as a
result, studied PV system maximum power point tracking control for
improving efficiency of PV systems has important theoretical and practical
significance.
This paper deeply studies and analyzes the physical principle and output
characteristics of photovoltaic cells. Because the operating point of the
photovoltaic cell susceptible to external environmental conditions, which
will result in a loss of the photovoltaic power system, therefore the PV
array must be controlled by the maximum power point tracking system, to
ensure that it is always in the optimum operating point. At present, the
commonly used method of PV array maximum power point tracking control hasa lot of, mainly has Perturbation and Observation method, incremental
conductance method, the parasitic capacitance method and fuzzy control
method, etc. This paper describes in detail the Perturbation and
Observation method and study its principles and working process, but also
its oscillation problems and false problems were analyzed, then paper
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