Stable Operation of Grid-Interfacing Converter during the Operation of Active Power Filters in Power Grids

This paper introduces a control strategy for assessing the role of shunt active power filters (SAPF) in electrical power networks. The proposed control scheme is based on the Lyapunov control theory and defines a stable operating region for the interfaced converter during the integration with utility grid. The compensation of instantaneous variations of reference current components in the control loop of SAPF in ac-side, and dc-link voltage oscillations in dc-side of the proposed model, is considered accurately, which is the main contribution of this work in comparison with the other potential control approaches. The proposed control scheme can confirm the injection of all the harmonic current components and reactive power of grid-connected loads with a fast dynamic response, and a unity power factor between the grid currents and voltages. An extensive simulation study is performed, assessing the effectiveness of the proposed control plan in the utilization of SAPF in power networks.