Day-ahead Reactive Power Optimization for Active Distribution Network Considering Flexible Loads

As a response to environmental issues related to climate change, renewable distributed generations (DGs) are getting more and more integrated into active distribution network (ADN) in recent decade, which can result in certain difficulty in voltage control. This difficulty can usually be tackled by reactive power optimization (RPO) considering DGs and traditional voltage control measures, but sometimes needs more efforts to overcome. In this paper, flexible loads (FLs) are utilized in ADN voltage control. A day-ahead RPO model considering FLs is proposed to relief voltage over-limit caused by massive DG integration, which considers the constraints from FLs besides DGs and ADN, and is solved by General Algebraic Modeling System (GAMS). The effectiveness of the proposed method is verified by the case studies of the modified IEEE 33-bus system.