Ando Yuji, Oku Takeo, Yasuda Masashi, Ushijima Kazufumi, Matsuo Hiroshi, Murozono Mikio
Department of Materials Science, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga, 522-8533, Japan.
Collaborative Research Center, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga, 522-8533, Japan.
Heliyon. 2019 Dec 31;6(1):e03094. doi: 10.1016/j.heliyon.2019.e03094. eCollection 2020 Jan.
A photovoltaic power generation system suitable for mobile applications was developed. A SiC integrated converter with the maximum power point tracking circuit provided the smallest photovoltaic inverter in ~200 W level. The SiC-based inverter exhibited a peak direct current (DC)-alternating current (AC) conversion efficiency higher than that of conventional Si inverters. A Li-ion laminated battery was mounted in the same housing as the inverter. The weight of entire system containing spherical Si solar cell panels was well below 6 kg. Continuous operation measurements of this system were carried out using four solar cell modules connected in parallel under irradiation by natural sunlight. The total inverter efficiencies under realistic operation conditions were slightly decreased compared with the DC-AC converter values because of loss by the maximum power point tracking device. Even under unstable weather conditions, the system provided power stability without ripples. The behaviors of the output powers of the solar cell, storage battery, and inverter modules were analyzed as a function of the solar radiation power density. The substantial efficiencies of the solar cell modules were dependent on the weather conditions and were approximately 10% on cloudy days. The present compact photovoltaic power generation system with SiC device and spherical Si solar cells is viable for sub kW-class inverter.
开发了一种适用于移动应用的光伏发电系统。带有最大功率点跟踪电路的碳化硅集成转换器在约200瓦功率级别提供了最小的光伏逆变器。基于碳化硅的逆变器展现出高于传统硅逆变器的峰值直流-交流转换效率。一个锂离子层压电池与逆变器安装在同一外壳中。包含球形硅太阳能电池板的整个系统重量远低于6千克。使用四个并联连接的太阳能电池模块在自然阳光照射下对该系统进行了连续运行测量。由于最大功率点跟踪装置造成的损耗，实际运行条件下的总逆变器效率与直流-交流转换器的值相比略有下降。即使在不稳定的天气条件下，该系统也能提供无纹波的功率稳定性。分析了太阳能电池、蓄电池和逆变器模块的输出功率行为与太阳辐射功率密度的函数关系。太阳能电池模块的实际效率取决于天气条件，在阴天时约为10%。目前这种带有碳化硅器件和球形硅太阳能电池的紧凑型光伏发电系统对于亚千瓦级逆变器是可行的。
