光伏发电并网效率提升的关键技术研究现状

在人们对能源需求急剧增加,而化石能源日益匮乏的背景下,开发和利用太阳能等可再生资源越来越受重视。以太阳能电池为特征的光伏产业,普遍被世界各国看好。首先,太阳能因其储量的无限性、存在的普遍性、利用的清洁性以及实用的经济性,已经被公认是世界未来发展的主要可再生能源之一。但效率问题仍然困扰着光伏发电的最大问题。文章介绍了国内外相继出现了3种方法来提高太阳能光伏发电效率:首先提出的是太阳能跟踪算法,有效地提高了光伏阵列的受光量,进而提高其发电效率;其次针对光伏列阵单峰值与多峰值MPPT控制,介绍了几种常用的方法,并对其特点进行了对比;最后介绍了并网逆变器侧有两类检查孤岛的方法:有源法和无源法。

Key Technologies Research to Improve the Efficiency of Grid-connected Photovoltaic Power Generation

The fossil energy is scarce while demand for energy is increasing sharply. So development and utilization of solar and other renewable resources are paid more and more attention. The PV industry is generally optimistic world- wide. First of all,the solar energy because of its unlimited reserves, universality, the clean use and practical economy,has been recognized as the world＇s future development of renewable energy sources. Efficiency issues continue to plague the biggest problem of the photovohaic power generation. The article describes three methods to improve the efficiency of solar photovoltaic power generation： the amount of light of PV array is effectively improved by solar tracking algorithm. Secondly,the paper describes several commonly used methods for single and multi-peak MPPT control. Finally, active and passive methods are introduced for checking the island operation.