Implementation of a distributed Stand Alone Merging Unit

Abstract

Smart substations for smart grids must be safe and reliable. In order to enable the development of smart substations, according to IEC61850 standards, a new stand alone merging unit based on STM32F7 arm microcontroller is proposed in this paper. The time synchronization is obtained by means of an Oscillator Disciplined by Global Positioning System (GPSDO); a high-precision Analog-to-Digital Converter (ADC) samples and converts voltage and current signals. The microcontroller coordinates the various parts of the system, implements the synchronization of merging unit and ethernet communication.