摘要
电导增量法是确保光伏发电系统能够以最佳效率将太阳能转化为电能的一种控制技术。为提升传统变步长电导增量法的环境适应性,改善光伏电池的最大功率点跟踪性能,本文提出一种改进的变步长电导增量法。先对电压、电流差值进行实时修正避免误判,再引入与电流相关的系数和与功率相关的系数分别对最大功率点两侧的步长变化量进行修正,优化电导增量法步长变化量,进而达到快速并准确地进行最大功率点跟踪的作用。利用上述方法进行仿真实验发现,在外界环境变化时,与传统的自适应变步长电导增量法相比,本文方法的稳态振荡范围只有传统方法的一半左右,达到稳态需要的时间也只有传统方法的60%,改进后的电导增量法有效地降低了重新跟踪最大功率点过程中由步长变化带来的功率损耗。
The incremental conductance method is a control technology designed to ensure that photovoltaic power generation systems can efficiently convert solar energy into electricity.In order to enhance the environmental adaptability of the traditional variable step conductance increment method and improve the maximum power point tracking performance of photovoltaic cells,this paper proposes an improved variable step conductance increment method.Firstly,real-time correction of the voltage and current difference is implemented to prevent misjudgment.Then,coefficients related to current and power are introduced to respectively correct the step size variation on both sides of the maximum power point,enabling fast and accurate tracking.Simulation experiments demonstrate that compared with the traditional adaptive variable step conductance incremental method,our proposed approach reduces steady-state oscillation range by approximately half and achieves the steady-state in only 60%of the time required by traditional methods when external environmental changes occur.The improved conductance increment method effectively minimizes power loss caused by changes in step size during maximum power point re-tracking.
作者
李涛
张春
罗苏明
郑涛
LI Tao;ZHANG Chun;LUO Suming;ZHENG Tao(School of Electrical Engineering,Anhui Engineering University,Wuhu 241000,China;Key Laboratory of Advanced Sensing and Intelligent Control for High-end Equipment,Ministry of Education,Wuhu 241000,China)
出处
《四川轻化工大学学报（自然科学版）》
CAS
2024年第5期15-21,共7页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
国家自然科学基金项目(U21A20146)
安徽省大学生创新创业训练计划项目(S202210363200)
安徽高校协同创新项目(GXXT-2020-070)。
关键词
光伏发电
最大功率点跟踪
电导增量法
变步长
photovoltaic power generation
maximum power point tracking
incremental conductance method
variable step size
