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The variability and uncertainty associated with renewable generation deployed in large shares in the distribution system, makes the continuous balancing of supply and demand an intricate process. Mitigating supply intermittency due to renewable generation requires energy storage systems as a countermeasure. Plug-in-hybrid electric vehicle (PHEV), also known as vehicle-to-grid (V2G), is used in this paper to alleviate the voltage profile fluctuations due to power variations of wind generation. A model of for the charging and discharging the PHEV is devised. PHEVs are then coordinated with reactive power control equipment, including on-load tap changer (OLTC), static voltage regulators (SVRs), and shunt capacitors (SCs). The proposed method is applied on the IEEE 34 test feeder system that has a wind power penetration level of 30%, using quasi-static time sequence analysis on diurnal basis. Results show that the coordinated charging operation among the PHEVs and dispatch of voltage control equipment is effective in constraining voltage excursions, resulting from the variability of wind generation; thus enhancing the overall system voltage profile.
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