Primary, Secondary and Tertiary Controls of a Mesh Multi-PCC Microgrid

The most commonly used approach for controlling microgrids generally follows a hierarchical control structure to maximize control flexibility and reduce control complexity. Using this approach, the control of distributed generators follows a hierarchy of conventional power system architectures consisting of three main levels: primary (distributed generators level), secondary (microgrid level) and tertiary (grid level). This hierarchy can ensure overall stability of microgrids by allowing decoupling of power flows, frequency and voltage restoration, and reactive power compensation. In this paper, a three-level decentralized Droop-based control is proposed to provide primary, secondary and tertiary control of a multi-source mesh microgrid. The effectiveness of the control is proven by simulations using Simscape tool in MATLAB.