基于模糊控制的光伏发电双FLC控制器设计

Dual FLC controller design for photovoltaic power generation based on fuzzy control

随着一次能源的日益短缺和环境问题的不断恶化,光伏发电技术作为新能源发电技术的重要领域而得到了广泛关注。但光伏发电对于光照强度的依赖性使其输出具有不确定性,这给并网运行带来了隐患。此外,为了实现清洁能源的最大可能出力,光伏的最大功率点追踪控制也得到了深入研究,这从某种程度上增加了其出力的不确定性,对光伏并网控制提出了新的要求。传统的PI控制器存在参数固定和局部收敛性,对光伏发电的建模精度要求较高,因此在光伏并网控制中存在缺陷。根据模糊控制原理设计了FLC控制器,并将该控制器应用于并网逆变器控制和DC/DC电路控制中,该控制器因具有灵活的参数调整主动权,对被控对象的建模精度要求不高而表现出更为优越的控制性能。该控制器的设计将为光伏并网提供更为有利的控制手段。

Due to the shortage of primary energy and accounting for the problem of environmental deterioration,the photovoltaic（ PV） technology has become widely concerned as a major area of new energy generation technologies. The dependence of PV generation on light intensity, however,determines the uncertainty of its output,which also brings risks to grid-connected operation. In addition,PV maximum power point tracking（ MPPT） control has been studied deeply to achieve the maximum output of clean energy. And it somehow increases the uncertainty of its output,thus resulting in new requirements for PV grid connection control. Traditional PI controller has defects in PV grid connection control,for its fixed parameters and local convergence have high requirements for PV generation modeling. In this paper,we designed an FLC controller according to fuzzy control theory and applied it into the control of grid-connected inverter and DC/DC circuit. The flexible parameter adjustment initiative and proper requirements for modeling accuracy make this controller have better performance. So this controller can provide a more favorable control method for PV grid-connection.