Development of a Transfer Standard for DC Power Quality Reference Systems

Most renewable energy sources are operated in direct current (DC) and require dedicated inverter to be integrated in the power system. This results in loss of rotational inertia as well as degradation of the power quality (PQ) indices. A promising alternative is represented by low-voltage DC grids, whose standardization though is still incomplete. Reference systems are being developed for DC metering and DCPQ, but their validation requires inter-laboratory comparison. To this end, we propose the design and preliminary characterization of a transfer standard for DCPQ measurements. The obtained results confirm the reliability of the proposed architecture, that guarantees a worst-case power uncertainty of 1 % over the frequency range from DC to few tens of kHz.