A simplified method for fault detection and identification of mismatch modules and strings in a grid-tied solar photovoltaic system

Abstract

The foremost problem facing by the photovoltaic (PV) system is to identify the faults and partial shade conditions. Further, the power loss can be avoided by knowing the number of faulty modules and strings. Hence, to attend these problems, a new method is proposed to differentiate the faults and partially shaded conditions along with the number of mismatch modules and strings for a dynamic change in irradiation. The proposed method has developed in two main steps based on a simple observation from the Current versus Voltage (I-V) characteristic curve of PV array at Line-Line (LL) fault. First, the type of fault is detected using defined variables, which are continuously updated from PV array voltage, current, and irradiation. Second, it gives the number of mismatch modules (or short-circuited bypass diodes) and mismatch strings (or open-circuited blocking diodes) by comparing with the theoretical predictions from the I-V characteristic curve of PV array. The proposed algorithm has been validated both on experimentation using small scale grid-connected PV array developed in the laboratory as well as MATLAB/Simulink simulations. Further, the comparative assessment with existing methods is presented with various performance indices to show the effectiveness of the proposed algorithm.

Electrical Line Fault Detection and Line Cut-Off Equipment and Control

“…However, it is necessary to set a uniform line in the analysis, and the use of impedance method can effectively reduce the cost. is fault detection method is more applicable to simple circuits, but not too complex circuits [4]. Kim et al pointed out that the problem of cable fault location can be realized by a wavelet algorithm.…”

Research on autonomous intelligent inspection technology of substation based on image recognition and computer vision

“…Different equipment shows obvious differences in appearance and state 3 . In the inspection of these electrical equipment, in addition to the traditional manual inspection methods, we can also rely on artificial intelligence technology and big data technology to build intelligent inspection robots, and realize the recognition of image information through image recognition technology 4 . With the development and progress of substation inspection robot technology, substation operation and maintenance business has gradually changed from traditional manual to intelligent and autonomous inspection robot 5 .…”

An Online Novel Two-Layered Photovoltaic Fault Monitoring Technique Based Upon the Thermal Signatures

“…The PV generators are prone to faults on the generation side, so-called direct current (DC), and on-grid integration side, so-called alternating current (AC), connected through an inverter. The nature of faults frequently reported on the DC side include mismatch [4], interconnection and connection [5], earth [6], arc [7], line to line [8], bypass diode [9], short circuit (SC) and open circuit (OC) [10], maximum power point tracking (MPPT) [11], and degradation [12]. The rate of fault occurrences increases as the panels degrade over time, reaching up to 0.8% per year in the worst case [13].…”

“…Sustainability 2020, 12, x FOR PEER REVIEW 2 of 13 include mismatch [4], interconnection and connection [5], earth [6], arc [7], line to line [8], bypass diode [9], short circuit (SC) and open circuit (OC) [10], maximum power point tracking (MPPT) [11], and degradation [12]. The rate of fault occurrences increases as the panels degrade over time, reaching up to 0.8% per year in the worst case [13].…”