A Study on Compensating Voltage Drop in Distribution Systems due to Nighttime Simultaneous Charging of Electric Vehicles Utilizing Charging Power Adjustment and Reactive Power Injection

概要

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To realize reduction in environment load, electric vehicles (EV) have been attracting great attentions and expectations since they can run at good fuel efficiency without exhaust gases. It is expected that the EVs will become more and more popular. Generally, EVs would be used for driving during daytime and be charged during nighttime considering our lifestyle and time-of-use program. If most of EV owner adopt the use pattern, feeder voltage profiles could be greatly affected. It would cause severe voltage drop.In this paper, battery charger for EV consists of self-commutated inverter, which can control not only active power but also reactive power in principle. We propose a basic feeder voltage regulation algorithm, "PQ control", using EVs by means of adjustment of EV charging schedule and reactive power injection. In addition, we propose "prediction control" which is based on "PQ control" and is considering prediction of receiving voltage. And advanced regulation algorithms, "communication control", utilizing communication among EVs and the distribution system operator are proposed. The purpose of this paper is to confirm the effectiveness of the three proposed algorithms by simulations.