Generalized Predictive Control for Voltage Source Inverter in Islanded Microgrid

Abstract

In this work, the generalized predictive control (GPC) is applied to the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$LC$</tex> -filtered voltage source inverter (VSI), which performs as the voltage-controlled type in Microgrid application. As a popular kind of model predictive control (MPC), the GPC features a fast dynamic response and intuitive modeling process. However, rare research has focused on the parameters design, analysis, as well as benefits of GPC applied to the multiple-input multiple-output (MIMO) system. Motivated by this, the GPC is implemented to improve the voltage dynamic performance, where the robustness is also investigated. Moreover, this work reveals that the GPC becomes more robust against the control and model parameters with the increased prediction horizon. The closed-loop eigenvalue analysis is adopted to check the system's stability. Experimental results are provided to verify the proposed theoretical contribution. The conventional control loop, i.e. the outer proportional-resonant (PR)+virtual impedance is selected as the benchmark to show the benefits of the proposed GPC.