2020/04/24 by Rahul Ranjan Jha, Jha, Rahul Ranjan, Anamika Dubey +3
Engineering · #Microgrid Control and Optimization #Optimal Power Flow Distribution #Smart Grid Energy Management
paper · pdf · doi:10.48550/arxiv.2004.11879
Voltage control devices are employed in power distribution systems to reduce\nthe power consumption by operating the system closer to the lower acceptable\nvoltage limits; this technique is called conservation voltage reduction (CVR).\nThe different modes of operation for system's legacy devices (with binary\ncontrol) and new devices (e.g. smart inverters with continuous control) coupled\nwith variable photovoltaic (PV) generation results in voltage fluctuations\nwhich makes it challenging to achieve CVR objective. This paper presents a\ntwo-timescale control of feeder's voltage control devices to achieve CVR that\nincludes (1) a centralized controller operating in a slower time-scale to\ncoordinate voltage control devices across the feeder and (2) local controllers\noperating in a faster timescale to mitigate voltage fluctuations due to PV\nvariability. The centralized controller utilizes a three-phase optimal power\nflow model to obtain the decision variables for both legacy devices and smart\ninverters. The local controllers operate smart inverters to minimize voltage\nfluctuations and restore nodal voltages to their reference values by adjusting\nthe reactive power support. The proposed approach is validated using the\nIEEE-123 bus (medium-size) and R3-12.47-2 (large-size) feeders. It is\ndemonstrated that the proposed approach is effective in achieving the CVR\nobjective for unbalanced distribution systems.\n