Fixed-Switching-Frequency Modulated Model Predictive Control for Islanded AC Microgrid Applications

In this paper, a fixed-switching-frequency modulated model predictive control (M2PC) is established for two-level three-phase voltage source inverter (VSI) working in an islanded AC microgrid. These small-scale power systems are composed by two or more VSIs which interface DGs, controlling the amplitude and frequency system, simultaneously sharing load active reactive power. Generally, these operational characteristics achieved using hierarchical linear loops, but with challenging limitations such as slow transient reaction to disturbances high proneness be affected parameter modifications. Model may solve issues. Nevertheless, most used developed scheme, finite-set (FS-MPC), presents drawback of having harmonic spectrum spread over all frequencies. This brings issues coupling between different levels whole microgrid eventually, when designing filters main-grid connection. paper aims developing M2PC higher-level loops operation advantages proved configuration where methodology paralleling multiple M2PC-regulated described, rapid response, inherent stability, fully decentralised individual VSIs, achieving proper sharing, eliminating circular currents, waveforms output currents capacitor voltages. All achievements have been confirmed via simulation experimental verification.