Reactive power control of power conditioning systems to avoid voltage deviation in high-voltage distribution systems caused by both of photovoltaic generation and electric vehicle charging

The introduction of electric vehicles has been increasing as well as photovoltaic generation systems. These introductions cause the voltage drop and rise on high-voltage distribution lines, so that voltage deviation will be out of the specified voltage range. As a countermeasure against this problem, the voltage control method with static Var compensators (SVCs) is implemented. However, SVCs are expensive and power losses on the distribution line increase. This paper proposes a novel voltage control method in which power conditioning systems output leading and lagging reactive power aiming to solve the above-mentioned problems. It is clarified that the proposed method is more effective in solution of these problems than compared with the voltage control method using SVCs.