9Esram T, Chapman P L. Comparison of photovoltaic array maximum power point tracking techniques[J]. IEEE Transactions on Energy Conversion, 2007,22(2):439-449.
10Nicola Femia, Giovanni Petrone, Giovanni Spagnuolo, et al. Optimization of perturb and observe maximum power point tracking method[J]. IEEE Trans. on Power Electronics, 2005, 20(4): 963-973.