Abstract
This paper emphasizes the design and investigation of a new optimization scheme for a grid-connected photovoltaic system (PVS) under unbalance faults. The proposed scheme includes fuzzy logic controller (FLC) based on the Levenberg–Marquardt (LM) optimization technique in coordination with bridge-type-fault-current limiter (BFCL) as the fault ride through (FRT) Strategy. The LM optimization-based control is an iterative process with a fast and robust response and is always convergent. The BFCL reduces the fault currents to rated values without compromising at ripples. A keen and critical comparison of the designed strategy is carried out with a conventionally tuned proportional-integral (PI) controller in coordination with the crowbar FRT strategy. A 100kW MATLAB/Simulink model of a photovoltaic system is used for simulation and analysis of unbalance faults at the point of common-coupling (PCC) and at 5 km away from PCC. It is found that grid-connected PVS is highly influenced by the fault type and less effected by the distribution line length. The simulation results authenticated smooth, stable, ripples with free, robust, and fault-tolerant behavior of the proposed scheme.
Highlights
The abrupt advancement in the concept of renewable energy resources (RERs) is due to its technical, economical, reliable, and environmental benefits, which gives way to low scale energy-sources and electrical potential storage devices for low and medium voltages [1]
The platform used for implementation of the 100-kW 3-phase grid connected to the photovoltaic system is Matlab/Simulink
fuzzy logic controller (FLC) based on the LM and bridge-type-fault-current limiter (BFCL)-based fault ride through (FRT) strategy
Summary
The abrupt advancement in the concept of renewable energy resources (RERs) is due to its technical, economical, reliable, and environmental benefits, which gives way to low scale energy-sources and electrical potential storage devices for low and medium voltages [1]. The RERs offer sustainability in all angles of the energy development sector [2]. The photovoltaic system (PVS) is contributing a main role to meet global electric power demand among various RERs [3,4,5]. The world is compelled to adopt RERs like PVS due to the reduction in greenhouse gas emissions and depletion of fossil fuels for conventional electric power generation [7,8,9]. To achieve the ripple-free and stable output from PVS to be injected toward utility grid, power electronics-based devices like DC
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