Abstract
The penetration of Renewable Energy Source (RES) has been increasing because RES is drawing attention by the environmental problem in the worldwide. The power flow can be changed from unidirectional to bidirectional because of increasing the penetration of RES. In bidirectional system, the efficient operation of conventional Voltage Regulators (VRs) is difficult. As one of the various methods to reinforce the conventional VR, the Volt-Var control of the Smart Inverter (SI) is used for supporting the voltage by using the reactive power of RES. This paper verifies the operating principle of the Volt-Var control function of the inverter and the oscillation phenomenon according to the slope of the Volt-Var curve was confirmed through theory, simulation, and demonstration site.
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