Development of 1-MW Inductive Power Transfer System for a High-Speed Train

TLDR

The study proposes designing and fabricating a 1‑MW inductive power transfer system to supply real‑time power to a high‑speed train without battery charge. The IPT system comprises a 1‑MW resonant inverter, a 128‑m transmitter, four pickups with rectifiers, and a wireless feedback network operating at 60 kHz to maintain constant pickup voltage across a 5‑cm air gap, while measuring the rail’s induced voltage and electromagnetic field for safety. Measured efficiency reached 82.7 % at 818 kW output with a 5‑cm air gap, and the fabricated system enabled the train to accelerate to 10 km/h during startup.

Abstract

Design and fabrication of a 1-MW inductive power transfer (IPT) system that supplies power to the vehicle in real time without any battery charge is proposed for a high-speed train. The IPT system consists of a 1-MW resonant inverter, a 128-m transmitter, four pickups, including rectifiers, and a wireless feedback network to maintain a constant output voltage of the pickups. The operating frequency of the system is 60 kHz to achieve efficient power transfer with a large air gap. The measured efficiency of the IPT system at the 818-kW output power of the pickups for the 5-cm air gap is 82.7%. The electromagnetic field and the induced voltage at the rail are also measured for safety evaluation. The fabricated IPT system was adapted to the high-speed train, and the train successfully accelerates to a speed of 10 km/h according to startup procedures.