Current-Controlled Interlinking Converter with Grid-Supporting Functionalities

A digital control system is proposed for grid-tied current-controlled interlinking converters that guarantees i) grid- supporting functionalities during grid connected operation and ii) automatic, prompt, and balanced power sharing among converters during islanded operation, without requiring mutual communication or supervising control. Thanks to the imple- mentation of an underlying large-bandwidth inverter controller, several favorable features are conjointly achieved, including effective rejection of circulating harmonic currents, resiliency to grid parameters variations (e.g., frequency and magnitude), smooth transitions between grid-connected and islanded modes. All together, the obtained valuable features make the proposed controller a promising solution for the forthcoming microgrid and smart building scenarios.