Model Predictive Virtual Oscillator Controlled Inverters in Islanded Mode of Operation

Virtual Oscillator Control (VOC) represents a decentralized control technique in the time domain, offering promising prospects such as fast dynamic response, accurate power sharing, and synchronization among paralleled inverters in islanded mode. However, it requires inner voltage-current loops for voltage regulation at the inverter output. These inner loops have conventionally relied on linear controllers such as Proportional–integral(PI) or Proportional-Resonant (PR), contributing to complexity and limiting dynamic response. This paper introduces an alternative to conventional linear loops by employing Finite-set Model Predictive Control (FS-MPC). By integrating the VOC and FS-MPC, the voltage at the output of the inverter can be predicted, and the error of tracking reference be minimized. Also, within the proposed method, a multi-objective optimization problem can be formulated enabling over-current limiting capabilities. It also facilitates a simplified control structure, broad bandwidth, and faster dynamic response by removing the need for PWM and inner linear controllers. Simulation results validate the efficacy of the proposed approach for single and multiple paralleled inverters.