Global MPPT of photovoltaic system based on scanning method under partial shading condition

Abstract

The partial shading (PS) of the photovoltaic (PV) array is a major problem for the PV systems. Therefore, it is necessary to extract the global maximum power point (GMPP) under partial shading. In this paper, we propose a simple method to find the GMPP. This method scans the P-V curve and memorizes all the peaks in order to get the global peak. Next, we control a boost DC-DC converter to extract the GMPP from the PV system. In addition, this Method allows following the dynamic GP under variant SPs with less oscillations around the stable state compared to the existing works.

Development of an Improved GMPPT Based on Scanning Method for PV System Operating under a Dynamic Partial Shading Conditions

“…With a maximum efficiency up to 99.50%. from this comparison, can be deduced in all test cases that the efficiency and the response time of the PV system are improved by 0.4% and 0.55 s respectively compared to the Scanning method [37].…”

“…Then, with the analysis based on PV characteristics, we could estimate the scan interval by limiting the search interval of the duty cycle, and thus improve the tracking speed. The obtained results showed that the proposed method efficiently tracks the GMPPT under different CSPs and has a good response time (1.4 s), which improves the response time of the PV system by 0.55 s compared to the conventional scanning method [37]. Thus, the simple structure used in this proposed method will significantly reduce the implementation complexity, which will lead to a reduction in the cost of the PV system.…”

“…Next, the second step consists of the determination of the GP using Eq. ( 4) [37]. It is noted that GP of the P-V Characteristics is the maximum value between all the values of P (i) recorded.…”

“…However, the implementation of these methods is more complex [26]. To overcome these complexity found in the EC and SI methods, the scanning algorithm is introduced in [37] where all the MPP's values are stored in a microcontroller. Yet, this method is simple and easy to implement in low-cost microcontrollers.…”