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Novel Spline-MPPT Technique for Photovoltaic Systems Under Uniform Irradiance and Partial Shading Conditions
IEEE Transactions on Sustainable Energy ( IF 8.8 ) Pub Date : 2020-07-14 , DOI: 10.1109/tste.2020.3009054
Amir Ostadrahimi , Yousef Mahmoud

Different maximum power point tracking (MPPT) techniques used in photovoltaic (PV) systems are evaluated based on several criteria such as simplicity, speed, and accuracy. There are tradeoffs among these criteria, and generally higher accuracy is achieved at the expense of speed and simplicity. This article aims to introduce Spline-MPPT technique as a fast, accurate, and uncomplicated method to find the maximum power point of PV systems under uniform irradiance and partial shading condition (PSC) in which characteristics of the PV string are distorted. The proposed method is based on cubic spline interpolation that defines an approximate function for a few sample points. Several interpolation-based methods have been proposed in the literature to find MPP under uniform irradiance. They, however, are incapable of finding the global maximum power point (GMPP) under partial shading conditions. The Spline-MPPT technique only uses a small number of current and voltage samples to estimate the MPP of the system and maintain on this point as long as environmental conditions remain unchanged. Simulation results attest to the superiority of the proposed method.

中文翻译:

均匀辐照和部分遮光条件下的光伏系统样条-MPPT新技术

光伏(PV)系统中使用的不同最大功率点跟踪(MPPT)技术是根据几种标准(如简单性,速度和准确性)进行评估的。这些标准之间存在折衷,并且通常以速度和简便性为代价获得更高的精度。本文旨在介绍样条-MPPT技术,该方法是一种快速,准确且简单的方法,可在均匀辐照度和部分遮蔽条件(PSC)下发现光伏灯串特性失真的情况下,找到光伏系统的最大功率点。所提出的方法基于三次样条插值,该三次样条插值定义了一些采样点的近似函数。文献中已经提出了几种基于插值的方法来在均匀辐照度下找到MPP。但是,他们 在部分阴影条件下无法找到全局最大功率点(GMPP)。Spline-MPPT技术仅使用少量电流和电压样本来估计系统的MPP,并在环境条件保持不变的情况下维持这一点。仿真结果证明了该方法的优越性。
更新日期:2020-07-14
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