Application of the Barrier Voltage Diode Model to Simulating Random Shading of Photovoltaic Modules

• Main Authors: Wen-Chin Tseng, 曾文欽
• Other Authors: Yaw-Juen Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/43333066671563220988

碩士 === 國立雲林科技大學 === 電機工程系 === 102 === Partial shading often happens to a photovoltaic (PV) power generation system and may greatly reduce its energy conversion efficiency. In this thesis, we build up the Barrier Voltage Equivalent Model (BVEM) according to the temperature characteristics of the Shockley diode model. In this thesis, the BVEM can simulate the instant variation of the solar irradiance and temperature of a PV module when the module is partially shaded. The measured solar irradiance and temperature data are used as the inputs of the BVEM for simulation and the results are compared with the measured power output data from the inverter to see the difference. The BVEM is tested for probabilistic simulation first for a single module, and then for two modules in series, without and with bypass diodes. Then we record the probability distribution of the maximum power output, and compare it with the result of simulation using Mathcad. Also, we use EMTP software to simulate three BVEM modules in series with and without bypass diodes with random solar irradiance. PV arrays of six connection configurations, including simple-series, parallel-linked, series-parallel, total-cross-tied, bridged-linked, and honeycomb, have been compared when exposed to random shading. The probability distribution of the array maximum power output have been observed.