Fast and Accurate Multi-Physics Model for Optimization-based Design of VSBBC

The development and validation of an advanced two-level Voltage Source Back-to-Back Converter model, considering its multi-physics operation, is presented in this paper. Based on a set of input parameters, the proposed model evaluates the converter in terms of input current ripples, transient performance, losses, and total volume. The model is discussed separately in three parts: modulation and control analysis, semiconductor loss estimations and heatsink sizing, and passive components sizing, i.e. for the boost inductors and DC-link capacitor. The performance analysis and loss calculations are verified to be accurate using time-domain simulations and experimental loss measurements. Due to its computational efficiency and accuracy, the proposed model is suitable for use within an optimization design environment.

I. Introduction

To maximize a specific feature or performance, modern system design typically involves an optimization process [1]. In power converter design, the performance indices are often identified as volume, weight, cost, and power loss [2].