電気二重層キャパシタを用いた直流電気鉄道用電力貯蔵による電圧降下補償に関する検証

摘要

Interest has been shown in the concept of an energy storage system aimed at leveling load and improving energy efficiency by charging during vehicle regeneration and discharging during running. Such a system represents an efficient countermeasure against pantograph point voltage drop, power load fluctuation and regenerative power loss. We selected an EDLC model as an energy storage medium and a step-up/step-down chopper as a power converter to exchange power between the storage medium and overhead lines. Basic verification was conducted using a mini-model for DC 400 V, demonstrating characteristics suitable for its use as an energy storage system. Based on these results, an energy storage system was built for DC 600 V and a verification test conducted in conjunction with the Enoshima Electric Railway Co. Ltd. This paper gives its experimental analysis of voltage drop compensation in a DC electrified railway and some discussions based on the test.%直流電気鉄道では，電鉄用変電所からき電線などの送電rn線やレールを介して電車に電力が供給される。従って，変rn電所から電車までの距離が長く電車負荷が大きい場合，変rn電所から電車へ大電流が流れるため，送電線の抵抗分によrnる電車パンタ点の電圧降下も大きくなる。電圧降下が大きrnくなると，電車の機能を維持し列車の運転時分を確保するrnための十分な電圧を確保できなくなる恐れがある。