局部陰影下的光伏陣列MPPT算法研究
[Abstract]:On the one hand, the rapid development of the world economy and the sustained growth of the world population make the total demand for energy increasing at an alarming rate; on the other hand, the global fossil fuel reserves are decreasing day by day, and there is a crisis of exhaustion. It has become a serious environmental problem. So the development and utilization of green renewable energy is imminent. Photovoltaic power generation is a new renewable energy technology, which has attracted people's attention for its own characteristics. Specific aspects have been studied.
1) The simulation models of photovoltaic cells and Boost circuits are built based on MATLAB simulink. The output characteristic curves of photovoltaic cells and shaded photovoltaic arrays are analyzed to prepare for the design of maximum power point tracking (MPPT) algorithm for shaded photovoltaic arrays. According to the laws and the results of simulation analysis, the results are in good agreement.
2) Four traditional MPPT algorithms are compared and analyzed, including constant voltage method, disturbance observation method, incremental conductance method and fuzzy logic control method. In the process of algorithm analysis, different variable step size control strategies are designed for the latter three algorithms, and their respective control effects are simulated and analyzed. The method of generating fuzzy logic control rules from measured data by network provides conditions for on-line generation of fuzzy control rules.
3) The power-voltage characteristic (P-V) curves of photovoltaic arrays with local shadows have multiple extremum points, and the current-voltage (I-V) characteristic curves are ladder-shaped, which makes the traditional MPPT algorithm based on single-peak optimization invalid. MPPT algorithm of force. The algorithm adjusts the input position near the global optimum by particle swarm optimization (PSO) algorithm, and then obtains the global optimum by variable step conductance increment method. The problem of system oscillation caused by large-scale random initialization of particle position is solved, and the advantages of traditional single-peak optimization algorithm are effectively utilized to enhance the rapidity and stability of system search, and good control effect is achieved.
4) At last, the hardware circuit of the small-scale photovoltaic power generation system is designed. The Boost circuit realized by soft-switching technology improves the conversion efficiency of the power circuit.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM615;TP18
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