A Synchronous Distributed Control and Communication Network for High-Frequency SiC-Based Modular Power Converters

Files
TR Number
Date
2019-12-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Virginia Tech
Abstract

Numerous power electronics building blocks (PEBB) based power conversion systems have been developed to explore modular design, scalable voltage and current ratings, low-cost operations, etc. This paper further extends the modular concept from the power stage to the control system. The communication network in SiC-based modular power converters is becoming significant for distributed control architecture, with the requirements of tight synchronization and low latency. The influence of the synchronization accuracy on harmonics under the phase-shifted carrier pulse width modulation (PSC-PWM) is evaluated. When the synchronization is accurate, the influence of an increase in harmonics can be ignored. Thus, a synchronous distributed control and communication protocol with well-performed synchronization of 25 ns accuracy is proposed and verified for a 120 kHz SiC-based impedance measurement unit (IMU) with cascaded H-bridge PEBBs. An improved synchronization method with additional analog circuits is further implemented and verified with sub-ns synchronization accuracy.

Description
Keywords
communication network, distributed control, synchronization, low latency, modular power converters, SiC MOSFET
Citation
Collections