Characterization Procedure for Stand-Alone Merging Units Based on Hardware-in-the-Loop Technology

Abstract

The digitalization of a medium voltage network requires huge efforts from distributed system operators and electric utilities. The main reason is attributed to the costs associated with the replacement or introduction of new intelligent electronic devices capable of collecting and digitalizing current and voltage measurements. To this purpose, this paper introduces a new idea of a stand-alone merging unit (SAMU), which features real-time and hardware-in-the-loop technology, completed with accurate voltage and current sensors. Furthermore, the characterization procedure that allows an evaluation of the metrological performance of a complex device, such as a SAMU, is fully described. From the results, it is highlighted that (i) the developed SAMU is capable of performing highly accurate voltage, current, and power measurements; (ii) the characterization procedure is simple and exploitable for all kinds of SAMUs and other synchronized measurement devices.

Monitoring and Automation of Complex Power Systems

“…The works presented in [1,2] deal with the measurement layer of the automation chain. In [1], a low-cost measurement instrumentation setup is proposed for the characterization of the metrological performance of voltage instrument transformers (VTs) up to the first resonance frequency.…”

“…This contribution is particularly relevant since, above all, at the distribution level, sensors are potentially required to work in an increasingly polluted (from a power quality perspective) environment. The characterization of metrological performance is also the focus of [2]. Here, a stand-alone merging unit is presented together with the procedure for its accuracy characterization in a hardware-in-the-loop setup that includes both sensors and measurement units.…”