|Design and construction of a double-axis sun-tracking system
|Lai, Yuk-ming (EIE)
Photovoltaic power systems.
Hong Kong Polytechnic University -- Dissertations
|Faculty of Engineering
|89 leaves : color illustrations ; 30 cm
|The solar panel tracking system is an important part of photovoltaic generation system and its good tracking control performance is the key factor to ensure the efficiency of the solar power. With the solar panel light-tracking system as research subject and the best use of solar power as main goal, this thesis has carried out the maximum power point tracking control theory and simulation studies, and developed a sun-tracking system. The output characteristic of photovoltaic array is the most fundamental problem in the study of photovoltaic power generation system. Based on the output characteristics of photovoltaic array equation, the thesis applies Matlab/Simulink and builds the simulation model of photovoltaic array. The model parameters are set with reference to specific photovoltaic panels' product parameter. It emulates the photovoltaic battery output characteristic under different temperature. The result shows that the model can quickly respond to light intensity change. When the rapid change of light intensity happens, it is able to achieve maximum power tracking quickly. Consequently it provides the basic guarantee for the realization of the system simulation, the guiding theory research and system design. Photovoltaic maximum power point tracking (MPPT) method is the important means to enhance the efficiency of the system in the power system. On the basis of the characteristics of photovoltaic array output and its simulation model, the thesis proposes the method and the principle of maximum power point tracking and introduces common MPPT method. On this basis, aiming at the existing problem of fixed step size perturbation and observation (P&O) method, an improved variable step size perturbation and observation (P&O) MPPT method is put forward and uses Matlab/Simulink for the simulation of the algorithm. The simulation results show that the improved P&O MPPT method is stable and efficiently track the maximum power point of photovoltaic array. At the same time, under the condition of parameter perturbation such as the intensity of sunlight, environmental temperature etc, a global scan MPPT tracking algorithm was studied, with higher probability tracking to the global MPPT, and can quickly find a new working point, keep the system stable and show a good dynamic characteristic. In the design of photovoltaic power generation systems, it has important theoretical significance and practical value.
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