Voltage control optimization to improve transmission efficiency under near real-time conditions

This paper presents a case study on improving transmission system efficiency under near real-time conditions using voltage control optimization. In general, generator voltage schedules are developed using off-line planning models with expected system conditions, e.g., expected loads and generation. Optimal voltage schedules can be determined with Optimal Power Flow (OPF) programs to achieve certain pre-determined objectives, such as reducing active and/or reactive power losses. In addition, these optimal voltage schedules can result in a higher reactive power reserve and a more reliable power system. This case study uses Energy Management System models as proxies of near real-time operational conditions and an OPF to improve transmission efficiency while controlling the generator voltage schedule and switching on/off shunt reactive devices.