Research Site for Low-Voltage Direct Current Distribution in a Utility Network - Structure, Functions, and Operation. - Pasi Nuutinen; Tero Kaipia; Pasi Peltoniemi; Andrey Lana; Antti Pinomaa; Aleksi Mattsson; Pertti Silventoinen; Jarmo Partanen; Juha Lohjala; Mika Matikainen (IEEE Trans. Smart Grid, 2014)