Energy Management in Microgrids Considering Uncertainties

Abstract

The EM problem in isolated MGs requires reliable operation strategy to make robust operation decisions in the existence of intermittent and uncertain RESs with no support from the external grid. In this chapter, the adaptive robust optimization as a competitor to the stochastic optimization is utilized in the EM of isolated MGs to minimize the worst-case operation costs to give more reliable solutions while considering the RESs uncertainties. Furthermore, the reactive power capabilities from inverter interfaced DERs are utilized to reduce the stress on diesel generators in supplying reactive power with no additional costs. Moreover, the reactive power related fuel costs of diesel generators are considered which are usually neglected for simplifications which results in errors in the calculated operational costs. Additionally, active and reactive power dispatches are optimized simultaneously in the proposed EM formulation which gives a more accurate results compared to active or reactive power dispatch when executed alone as in the previous literature. Accurate representation of the diesel generators as well as the inverter interfaced DERs is given through their capability curves to better model their behaviours instead of the widely used box constraints. In addition, realistic values of the costs for fuel, load shedding and all other parameters of the MG components were used to provide meaningful economic insights.