Abstract
A multi-time scale coordinated voltage control strategy in an islanded microgrid (MG) is proposed in this paper. The strategy is comprised of local voltage control of distributed generators (DGs), secondary voltage control (SVC) based on PI regulators and a proposed tertiary voltage control (TVC) strategy. A multi-objective function of the TVC is designed to achieve a compromise among three objectives: 1) minimized multi-bus voltage deviations, 2) accurate reactive power distribution among droop-controlled DGs after taking full advantage of surplus capacity of renewable energy DGs, and 3) minimized line losses. Power flow equations with SFC and SVC which are regulated by multi-inverters at different buses are proposed as the equality constraints of the TVC. Limitation constraints including bus voltage limitations, frequency limitation, and capacity limitations of DGs and lines are addressed as inequality constraints of the TVC. Simulation results verify the effectiveness of the proposed method.
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