Abstract
In this paper, a combined voltage control scheme is presented for improving the voltage profile, fluctuations, and imbalance of balanced and unbalanced residential distribution networks with a high penetration level (100% penetration level) of rooftop photovoltaic-wind turbine hybrid generation systems (PVWHSs) and electric vehicles (EVs). The combined control scheme includes both local and central control methods. Local controls in the inverter of EVs and PVWHSs of homes try to maintain their point of connection (POC) voltage within the acceptable range. Then the central controller does a complementary action for voltage improvement, by remotely controlling a battery energy storage (BES) and the network on-load tap changer (OLTC).The proposed control scheme is tested in DIgSILENT PowerFactory15.1.7 environment based on the weather and daily load data (wind speed, solar radiation, temperature, active and reactive power consumption of residential homes) during a year with a 1-min resolution in a three-phase four-wire network. The obtained results demonstrate the desired performance of the proposed scheme on voltage profile improvement, reducing voltage fluctuations, decreasing voltage imbalances of the phases and reduced number of tap operations, in the face of fast growth of distributed energy resources (DERs) penetration in the residential networks.
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