Multi-Time-Scale Volt/var Control in Distribution networks with the Coordination of PV Inverters and Capacitor Banks

Abstract With the increasing penetration of photovoltaics (PVs) in distribution networks, PV inverters and capacitor banks (CBs) should be well utilized for volt/var control tackle fluctuations uncertainty introduced by PVs. This paper proposes a multi-time-scale method to coordinate CBs, where complementarity between minute second-level promotes economic secure operations networks. Firstly, model optimization (VVO) is constructed minimize network losses CB operations, are set reserve some reactive regulation capacity used real-time control. According VVO, predictive carried out consider future fluctuations, which decides current 5-minute all devices achieve operations. To avoid uncertainties resulting possible voltage violations, further adaptively adjusts MPC values, rapidly drives power abilities ensure security maintains that results almost do not deviate from economy. Case studies based on modified 17-node verify effectiveness proposed method.