ABSTRACT

Being the most abundant renewable source of energy, photovoltaic arrays (PVA) are extensively used for power generation. A number of factors influence performance of the PVAs, among which complete or partial shading of PVAs is perceived as a major concern for the researchers. Complete or partial shading reasonably reduces the output power of PVAs which subsequently leads to multiple maximum power points (MPPs) in the P-V curves. One of its major consequences is reverse power flow, conventionally blocking diodes (BD) based on different configuration are utilized to limit the adverse effects of reverse power flow. This paper proposes a novel scheme to improvise performance of the photovoltaic array configuration (PVAC) under-shaded condition, in which conventionally used BDs are replaced by blocking P-MOSFET (BP-MOS). A comparison study is carried out to determine performance of four different PVAC’s such as series-parallel (SP), total-cross-tied (TCT), bridge-link (BL), and honey-comb (HC) employing BDs as well as BP-MOS. Simulations are accomplished on MATLAB/SIMULINK, in order to analyze practical implications of preferred the PVAC under various illumination conditions (such as horizontal, vertical, and diagonal). Obtained results reveal efficacy of the proposed configuration in terms of least power loss, increased fill factor, and thus maximum efficiency.

摘要

作为最丰富的可再生能源，光伏阵列（PVA）被广泛用于发电。许多因素影响 PVA 的性能，其中 PVA 的完全或部分阴影被认为是研究人员的主要关注点。完全或部分遮蔽会合理降低 PVA 的输出功率，从而导致PV曲线中出现多个最大功率点 (MPP) 。其主要后果之一是反向功率流，基于不同配置的常规阻塞二极管 (BD) 用于限制反向功率流的不利影响。本文提出了一种改进光伏阵列配置 (PVAC) 阴影条件下性能的新方案，其中传统使用的 BD 被阻挡P -MOSFET (BP-MOS)。进行了一项比较研究以确定四种不同 PVAC 的性能，例如串并联 (SP)、全交叉连接 (TCT)、桥接 (BL) 和采用 BD 的蜂窝 (HC) 以及BP-MOS。仿真是在 MATLAB/SIMULINK 上完成的，以便分析在各种照明条件（如水平、垂直和对角线）下首选 PVAC 的实际含义。获得的结果揭示了所提出的配置在最小功率损耗、增加填充因子以及因此最大效率方面的功效。