Optimal Operation Methods of Protection Devices in Distribution Systems with PV Systems

This paper deals with the technical problems of protection devices in distribution systems with connected photovoltaic systems by developing a test device of protection coordination for photovoltaic systems. In order to analyze the operational characteristics of the protection devices in a distribution system connected with photovoltaic systems, in which bi-directional power flow could be supplied, this paper develops a test device that is composed of a model distribution system, protection device, and model PV system. By performing a simulation for operational characteristics of the protection devices based on the test device, this paper proposes a malfunction mechanism for the protection devices. The simulation results show that this paper is practical and effective for the technical guideline for the PV systems.