An optimal volt/var control strategy for an islanded microgrid considering the volt/var control capability

摘要

As an effective way to solve the problem of renewable energy utilization and power supply in remote areas, islanded microgrid has attracted extensive attention in recent years. However, due to the lack of stable reactive sources to provide voltage support and large random fluctuation of renewable energy and load, the reactive power balance and voltage stability of islanded microgrid in remote areas have encountered great challenges. In order to solve the problem of short-term optimal volt/var control of islanded microgrid better, firstly, a new index--volt/var control capability, has been proposed to determine the dynamic reactive power reserve and the allowable upper and lower limits of bus voltage in the microgrid for time to come in this paper. Then, based on this index, an optimal volt/var control strategy based on model predictive control (MPC) has been proposed to make full use of the reactive power output capacity of renewable energy. This optimal volt/var control problem was solved on GAMS platform. Finally, an islanded multibus microgrid with renewable energy such as photovoltaic and micro gas turbine was used to demonstrate the effectiveness of the proposed index and strategy.