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Sequential Volt/Var Controller for PV Smart Inverters in Distribution Systems

2022    Aboshady, F. M.; Pisica, Ioana; Ceylan, Oguzhan; Taylor, Gareth A.; Zobaa, Ahmed F.; Ozdemir, Aydogan

Increased photovoltaic (PV) penetration in distribution systems helps improve the system's performance by reducing the active power loss, in addition to the environmental benefits. However, high PV generation during light loading periods results in reverse power flows in the system. In turn, the voltage increases at the nodes located further from the main substation. This paper proposes a reactive power control method to coordinate the participation of different PV smart inverters in solving the overvoltage problem. The proposed control method operates at the lateral level based on the measured voltage at the lateral's end-node (or most downstream PV system). The lateral controller sequentially dispatches power factor commands to the smart inverters. This method maintains the coordination between the PV systems at different operating conditions keeping the reactive power requirement as low as possible. The proposed control method is compared to the volt/var control method from the IEEE standard 1547 and shows an improved performance in terms of reactive power requirement and active power loss.