Fault Identification and Islanding in DC Grid Connected PV System

Abstract

Nowadays, the DC distribution system has been suggested, as a replacement for the AC power distribution system with electric propulsion. This idea signifies a fresh approach of issuing energy for low-voltage installations. It can be used for any electrical application up to 20 MW and works at a nominal voltage of 1000 V DC. The DC distribution system is just an extension of the multiple DC links that previously available in all propulsion and thruster drives, which typically comprise more than 80% of the electrical power consumption on electric propulsion vessels. A fault detection and islanding scheme for DC grid connected PV system is presented in this paper. Unlike traditional ac distribution systems, protection has been challenging for dc systems. The goals of this paper are to classify and detect the fault in the PV system as well as DC grid and to isolate the faulted section so that the system keeps operating without disabling the entire system. The results show the measured values of power at PV panel and DC grid side under different fault condition, which indicates the type of fault that occurs in the system.

IoT-based monitoring and shading faults detection for a PV water pumping system using deep learning approach

“…When any failure occurs in the MPPT module, the output voltage and output power will decrease. While, most of the faults that may occur in the cable system and power transmission lines will lead to an obvious drop in the output voltage and output power [4], [5]. Common faults in PV panels can be categorized into three main types; physical faults, electrical faults, and environmental faults, as given in Figure 1.…”

“…With this concern, a range of faults have emerged in PV systems resulting in a partial or total loss of energy productivity [3], [4]. There are common faults in PV systems including ground fault, line-to-line fault, hot spots, bypass mismatch, and electric arc faults [5]. The fault detection procedure is mainly based on modeling and simulation of the entire PV system and real-time measurements of variables.…”

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“…If there were some problems in the PV system structure or wiring, the resistance between two points might be low, and it leads to short circuit and harms the PV system [115]. This fault is usually detected by analyzing power voltage characteristic curves [116].…”

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“…• Short circuit of two output lines; • Short circuit between input and output lines of different strings; • Hard-wired logic [42][43][44].…”