High-Efficiency Dual-Cascade DC–DC Wide Bandgap Converters Architecture for Tsunami Monitoring
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Abstract
Subsea tsunami-meter networks require reliable long-distance power delivery, yet current systems rely on grid-supplied AC feeders that are costly, difficult to deploy in remote regions, and vulnerable during extreme events. AC transmission further introduces reactive losses and reduced efficiency over long subsea cables, motivating a compact, renewable-powered HVDC alternative. This work presents a renewable-driven HVDC architecture combining solar–wind generation, lithium-based battery storage, a dual-cascade high-gain boost converter for long-distance delivery, and a controlled buck stage for regulated sensor-node supply. High-frequency wide-bandgap converters with PI regulation achieve low ripple, stable current control and high efficiency. Hardware results confirm minimal steady-state error and performance comparable to commercial subsea power units. Cable modelling shows that long HVDC links naturally filter ripple while slowing dynamic response. The prototype demonstrates that a high power density, renewable, fully DC system can replace grid-dependent AC infrastructure, reducing cost and enabling scalable, autonomous tsunami-monitoring large networks in remote regions.
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