A Study on Volt-Watt Mode of Smart Inverter to Prevent Voltage Rise with High Penetration of PV System

The penetration of renewable energy sources (RESs) into power systems is increasing, causing problems with power systems. In particular, increases in the output power of RESs cause reverse power flow and voltage rise, which may exceed the upper limit of the grid voltage. To solve these problems, research on control methods for RESs is being conducted to minimize their influence on the grid. This paper proposes a smart inverter control strategy to prevent voltage rise caused by RESs. Specifically, using a method to set parameters for Volt-Watt (VW) mode, the voltage profile of each bus is checked and voltage rise resulting from the injection of active power is prevented. To identify voltage rise problems caused by high penetration of photovoltaic (PV) systems and to confirm the effect of the method proposed in this paper, a simulation test is carried out using the IEEE 30 bus-test system.