Abstract

this paper presents a multi-scale model of cascaded H-bridge (CHB) converter that is able to simulate slow changing dynamics up to high-frequency switching transients within a same study. By modulating square waveform propagation on transmission line, a semi-analytical switching function model (SFM) is developed, and allows for accelerated simulation of switch-type electromagnetic transients (EMT). Using Fourier series expansion, such SFM is converted to a shifted-frequency dynamic phasor model (DPM) for simulating slow root mean square (RMS) waveforms. Due to the consistent modulation and complex analytical signal processes for different running stages, transitions between the SFM and DPM are smooth within the same run. Case studies involving the CHB energization, cell internal fault, and power oscillation are performed, and the validity of the proposed multi-scale transient model is verified through comparisons of the results with those from the full EMT-type programs.

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