High Efficiency Multiple Maximum Power Point Trackers for PV Panels

• Main Authors: Liao, Wei-Liang, 廖尉良
• Other Authors: Wu, Tsai-Fu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/38796021245768607250

碩士 === 國立中正大學 === 電機工程研究所 === 101 === This thesis presents development of high efficiency multiple maximum power point trackers (MPPTs) for PV panels in DC micro-grid and charge/discharge system. To deal with wide output voltage range of the PV panels, the proposed MPPT topology consists of buck and boost converters. When input voltage changes between high voltage and low voltage, the mechanism of changing reference input voltage is adopted to switch the operation mode. For increasing the efficiency of PV panels, a perturbation and observation algorithm is employed to track the maximum output power of the panels. Moreover, the multiple maximum power point trackers can be operated in independent mode or in parallel mode. In the parallel mode, a current balancing control is adopted for the multiple MPPT modules. In addition, the multiple MPPT modules are designed with a hot-swap feature to increase the application feasibility of the multiple MPPT modules in the DC micro-grid or charge/discharge systems. Finally experimental results have shown that the conversion efficiency can reach 98 % and the maximum power tracking accuracy can reach 99 %.