Document Type

Article

Publication Date

4-1-2021

Publication Title

IEEE Journal of Emerging and Selected Topics in Power Electronics

Volume

9

Issue

2

First Page

1222

Keywords

Constant power load (CPL), dc microgrid (MG), extended Kalman filter (EKF), model-in-the-loop, nonlinear dynamic, stochastic model predictive control (MPC)

Last Page

1232

Abstract

In this work, a novel nonlinear approach is proposed for the stabilization of microgrids (MGs) with constant power loads (CPLs). The proposed method is constructed based on the incorporation of a pseudo-extended Kalman filter (EKF) into stochastic nonlinear model predictive control (MPC). In order to achieve high-performance and optimal control in dc MGs, estimating the instantaneous power flow of the uncertain CPLs and the available power units is essential. Thus, by utilizing the advantages of the stochastic MPC and the pseudo-EKF, an effective control solution for the stabilization of dc islanded MGs with CPLs is established. This technique develops a constrained controller for practical application to handle the states and control input constraints explicitly; furthermore, as it estimates the current by using the pseudo-EKF, it is a current-senseless approach. As noisy measurements are taken into account for the state estimation, it leads to a less conservative control action rather than the classical robust MPC, whereas it guarantees the global asymptotic stability in the presence of noisy measurements and parameter uncertainty. To validate the performance of the proposed controller, the attained results are compared with state-of-the-art controllers. Furthermore, the implementability of the proposed method is validated using real-time simulations on dSPACE hardware.

DOI

10.1109/JESTPE.2020.3008885

ISSN

21686777

E-ISSN

21686785

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