Direct Power Control of Grid Connected Voltage Source Inverters using Port-Controlled Hamiltonian System

Abstract

This paper presents a new direct active and reactive power control (DPC) controller scheme for a three-phase grid connected voltage source inverter (VSI) based on the passivity viewpoint using port-controlled Hamiltonian (PCH) system. The controller consists of a feedforward part and a feedback one. The feedforward part is calculated from the dynamics model of the VSI using the property of the PCH system. The feedback part is designed to enhance its settling performance using Lyapunov theorem. The proposed control method guarantees the finite time reaching condition similar to sliding mode control (SMC). The proposed method is verified based on a simulation and an experiment. The simulation uses MATLAB/Simulink and PLECS, and the experiment uses hardware-in-the-loop with a digital signal processor. The simulation and experimental results for the proposed scheme are compared with those for a scheme using DPC-SMC for the grid-connected VSI. The proposed method provides less total harmonic distortions and a faster transient response.