Abstract：Based on the stability analysis methodology for cascade converters,the photovoltaic (PV) interface stability of current-fed (CF) maximum power point tracking (MPPT) converter adding input capacitor is studied,and the interface voltage control loop design guideline is given in this paper. The interface stability criterion of cascade system composed of PV cells and the MPPT converter is deduced at first,and then the output impedance of photovoltaic cells and the closed-loop input impedance of the Boost converter adding input capacitor are analyzed. According to the stability criterion proposed here,the stability conditions and the design guideline are derived. The design guideline shows that the controller parameter of the CF MPPT converter should be design under the minimum interface voltage. If the design guideline is followed,the converter will maintain the PV interface stability in the entire input voltage range for the MPPT converter. The validity of the theoretical analysis is verified by the experiments on a 150W prototype.
[1] 耿攀, 吴卫民, 叶银忠, 等. 两级式三相自然软开关DC/AC逆变器[J]. 中国电机工程学报, 2011, 31(30): 39-44. Geng Pan, Wu Weimin, Ye Yinzhong, et al. A two- stage three-phase natural-soft-switching DC/AC inverter [J]. Proceedings of the CSEE, 2011, 31(30): 39-44. [2] M G Villalva, T G de Siqueira, E Ruppert. Voltage regulation of photovoltaic arrays: small-signal analysis and control design [J]. IET Power Electronics, 2010, 3(6): 869-880. [3] J H Yang, H S Bae, J H Lee, et al. A simpli#x0fb01;ed series-parallel structure for maximum power point tracking (MPPT) system[C]. In Proceedings of IEEE APEC, 2008, 160-166. [4] S J Chiang, Hsin-Jang Shieh. Modeling and control of PV charger system with SEPIC converter [J]. IEEE Transactions on Industrial Electronics, 2009, 56(11): 4344-4353. [5] 郑必伟, 蔡逢煌, 王武. 一种单级光伏并网系统MPPT算法的分析[J]. 电工技术学报, 2011, 26(7): 90-96. Zheng Biwei, Cai Fenghuang, Wang Wu. Analysis and research of MPPT algorithm for a single-stage PV grid-connected power generation system[J]. Transac- tions of China Electrotechnical Society, 2011, 26(7): 90-96. [6] J M Enrique, E Duran, M Sidrach-de-Cardona, et al. Theoretical assessment of the maximum power point tracking ef#x0fb01;ciency of photovoltaic facilities with different converter topologies[J]. Solar Energy, 2007, 81(1): 31-38. [7] G Petrone, G Spagnuolo, R Teodorescu, et al. Reliability issues in photovoltaic power processing systems[J]. IEEE Transactions on Industrial Electronics, 2008, 55(7): 2569-2580. [8] J Lepp#x000e4;aho, T Suntio. Solar generator interfacing with a Current-Fed Superbuck converter implemented by duality-transformation methods[C]. The 2010 International Power Electronics Conference, 2010: 680-687. [9] T Suntio, J Lepp#x000e4;aho,Juha Huusari , et al. Issues on solar-generator interfacing with current-fed MPP- tracking converters [J]. IEEE Transactions on Power Electronics, 2010, 25(9): 2409-2418. [10] N Femia, G Lisi, G Petrone, et al. Distributed maximum power point tracking of photovoltaic arrays: novel approach and system analysis[J]. IEEE Transac- tions on Industrial Electronics, 2008, 55(7): 2610-2621. [11] J H Lee, H S Bae, B H Cho. Resistive control for a photovoltaic battery charging system using a microcontroller[J]. IEEE Transactions on Industrial Electronics, 2008, 55(7): 2767-2775. [12] 傅望, 周林, 郭珂, 等. 太阳能电池工程用数学模型研究[J]. 电工技术学报, 2011, 26(10): 211-216. Fu Wang, Zhou Lin, Guo Ke, et al. Research on engineering analytical model of solar cells [J]. Transactions of China Electrotechnical Society, 2011, 26(10): 211-216.
2013, Vol. 28 
