Nonlinear Model Predictive Control of Permanent Magnet Synchronous Generators in DC Microgrids

Abstract

A new strategy is proposed to control interior permanent magnet generators in dc microgrids interfaced through an active rectifier. The controller design is based on the decomposition of the system dynamics into slow and fast modes using singular perturbation theory. An inner current controller is developed based on output regulation techniques and an outer voltage controller is proposed using Nonlinear Model Predictive Control (NMPC). The NMPC regulates the dc bus voltage and minimizes the ac side losses. Simulation results are then presented based on realistic conditions for aircraft power systems.

Approximate Sensitivity Conditioning and Singular Perturbation Analysis for Power Converters

“…In this case, the approximate sensitivity strategy is implemented on a PMSM with an active rectifier, as shown in Fig. 5 [43], [44]. The system in this case is described by nonlinear differential equations.…”

“…T . The inputs d d and d q are obtained from standard inner current loop PIs with decoupling [43], [44]:…”