Abstract: The output characteristics of solar photovoltaic arrays are strongly nonlinear due to the influence of the external environment. In order to improve the overall efficiency of the system, an important way is to adjust the working point of the photovoltaic cells in real time and perform maximum power point tracking (MPPT). Always work near the maximum power point. Based on the analysis of volt-ampere characteristics of solar cells, an adaptive perturbation observation algorithm is used to design an MPPT control system based on TMS320F2812. Experimental results show that under the control of this algorithm, the system can accurately track the maximum power point. O Introduction With the accelerating process of economic globalization and the rapid development of the industrial economy, the energy issue has become an urgent problem for mankind. It is imperative to vigorously develop new alternative energy sources. Solar energy is an inexhaustible source of green energy. Solar power generation has sufficient cleanliness, absolute safety, relatively extensive resources and sufficient sufficiency, longevity and maintenance. The advantages. Although photovoltaic power generation has the above advantages, there are still many problems in practical applications. One of the main drawbacks of photovoltaic power generation is that the photoelectric conversion efficiency of solar arrays is too low. In order to solve this problem, an important way is to adjust the working point of the photovoltaic cell in real time and perform maximum power point tracking (MPPT) so that it always works near the maximum power point. At present, the maximum power point tracking problem of photovoltaic systems has become a hot topic in academic research. 1 Characteristics of photovoltaic cells The output characteristics of solar cells are non-linear, and they are affected by factors such as light intensity and ambient temperature. The equivalent circuit of the solar cell is shown in Figure 1. Figure 2 shows the IV and PV characteristics of the photovoltaic cell at different temperatures. Figure 3 shows the IV and PV characteristics of the photovoltaic cell under different sunlight intensity.
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Key words: photovoltaic cell; maximum power tracking; maximum power point tracking; TMS320F2812
The emergence of high-performance digital signal processing chips (DSPs) has made it possible to apply some advanced control strategies to photovoltaic power generation control systems. In this context, this paper uses TMS320F2812 produced by TI to control and carry out theoretical and experimental research on solar power generation system, which has important practical significance. [3]