Standards-Based Design Of 50/60 Hz Shore Power Converter Standards-Based Design Of 50/60 Hz Shore Power Converter

Abstract

This study proposes a standards-based design for integrating a 50/60 Hz shore power frequency converter to supply international vessels that operate at 60 Hz from a 50 Hz shore grid, while preserving electrical safety through adequate protection and conductor ampacity in a low-voltage shore connection (LVSC) system. A case study was conducted at The anonymized Surabaya terminal, which provides a 400 V, 50 Hz shore power service through five berth panels. The analysis adopts a conservative full-load basis of 250 A per berth panel and estimates converter capacity using three-phase power relations. The integration architecture is selected to reduce operational coupling between berths, while protection and cable adequacy are verified using a 125% margin rule (PUIL-based) and the LVSC interoperability framework of IEC/IEEE 80005-3 to justify frequency conversion for international-vessel service.

Results show a required active power of 147.05 kW per berth panel, corresponding to 735.25 kW total for five panels. A distributed one-converter-per-panel scheme using 200 kW modules yields approximately 73.5% nominal utilization per unit and supports practical deployment as three units for the domestic terminal and two units for the international terminal. In addition, the standards-based verification identifies targeted infrastructure upgrades required for robust operation under peak loading: MCCB GU III is under-rated for the aggregated domestic load (750 A) and should be uprated to 1250 A, while the ACB–Transformer feeder is the dominant thermal bottleneck and requires an ampacity upgrade to satisfy the minimum margin. Overall, the findings indicate that reliable 50/60 Hz interoperability depends on coordinated converter sizing and distributed integration, together with focused uprating of upstream protection and conductor capacity.