Voltage improvement in distribution networks with high penetration of electric vehicles and renewable energy sources

Abstract

This paper presents an automatic real-time procedure for continuous voltage improvement in the distribution network (DN) with high penetration of electric vehicles (EV) and renewable energy sources (RES). It is based on adapted Volt-Var-Optimization (VVO), which takes into account the capabilities of both traditional resources (load-tap-changers (LTCs), voltage regulators (VRs), capacitor banks (CBs)) and increasingly presented new resources (distributed generators (DGs) and energy storages (ESs)). In addition, VVO is integrated into the Distributed Energy Resources Management System (DERMS) for practical application. Its application has enabled the voltage values to be close to the nominal values and reduced the voltage imbalance. It is shown that by applying the same resources, without affecting EV charging and/or RES production, completely different problems can be solved: light DN with high PV injection and high load DN with additional EV load.