Setup for the Calibration of Current Measuring Systems Under DC Signals Affected by Ripple

In recent years, the adoption of DC technology in power systems is attracting renewed interest from the technical-scientific side not only in traditional high voltage applications (HVDC) which allow more efficient transmission of large quantities of energy over large distances but also in low voltage DC networks (LVDC), which allow for more efficient and sustainable integration of renewable energy sources and battery storage systems. An obstacle to its widespread diffusion is the lack of traceable reference systems able to evaluate the performance of energy meters for billing purposes in operating conditions characterized by DC with AC components (up to hundreds of kHz). The present work proposes a methodology to calibrate current measuring systems experiencing DC with AC ripple providing the metrological traceability for this combined signal. The developed and tested archetype, here presented, proves the feasibility of the methodology.