Review of Protection Coordination Challenges with PV Distributed Generation Using ETAP Analysis
DOI:
https://doi.org/10.65204/djes.v3i2.709Keywords:
Power Flow, pv, coordination, protectionAbstract
The integration of photovoltaic distributed generation (PV-DG) into radial distribution networks constitutes a qualitative leap toward sustainable power systems, yet it causes fundamental disruptions to traditional protection coordination designed for unidirectional power flows. This systematic review focuses on analyzing these challenges through numerical studies using ETAP software on standard IEEE test systems (13-node, 33-bus, 69-bus), demonstrating that PV penetration exceeding 20-30% of peak load reduces coordination time intervals (CTI) from 0.35s to 0.12s, generates bidirectional fault currents (1.0-2.0 pu), and causes protection blinding, sympathetic tripping, and fuse-recloser coordination violations due to short-circuit level variations (15-40%).ETAP simulations confirm overlapping TCC curves and reversed fault directions, necessitating advanced strategies including directional overcurrent relays (ANSI 67), genetic algorithm-optimized relay settings, current-limiting reactors (0.1-0.3 pu), and SCADA-supported adaptive protection that restores selectivity margins to ≥0.3s CTI in most scenarios, while identifying location-specific sensitivities validated across diverse faults (LL, LLG, 3LG) per IEC 60909 standards.Distribution networks are advised to conduct mandatory pre-integration ETAP studies compliant with IEEE 1547-2020, prioritize hybrid intelligent solutions (e.g., machine learning), and pursue future research on 100% inverter-dominated networks to ensure reliable protection in high-renewable grids.
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