Multi-Frequency Power Conditioning

The global transition towards sustainable energy systems is driving a fundamental transformation of electrical power grids. Future power systems may become fully power-electronics-based, enabling new approaches to energy transmission and control.

This thesis investigates multi-frequency operation in low-voltage power systems, where additional frequency components are intentionally utilized alongside the fundamental grid frequency. Two key concepts are explored: multi-frequency power transfer, which enables independent power transmission channels at harmonic frequencies, and waveform shaping, which modifies voltage and current waveforms to improve efficiency and overall system performance.

A comprehensive analysis of single-phase and three-phase multi-frequency systems is conducted, covering their impacts on components such as converters, cables, transformers, and protection devices. The research identifies both the opportunities and the practical limitations of multi-frequency operation.

The proposed methods are validated through application-oriented case studies, demonstrating how multi-frequency power conditioning can enhance system performance and facilitate the integration of renewable energy sources. The thesis establishes a foundation for future multi-frequency power systems and contributes to the development of next-generation electrical grids.