Modelling and Control Development for a Hybrid Microgrid System

The paper presents the modelling and control development for a hybrid microgrid system involving both DC and AC sub-grids. First, by using manufacturing data, a hybrid microgrid model including a PV system, a battery energy storage system (ESS), and a biogas generator sharing a DC bus and connecting to AC sub-grid via a grid tied inverter could be obtained. Then, control development for each individual microgrid component is implemented. Finally, a high-level controller for maintaining the DC and AC sub-grid operations of the hybrid microgrid could be achieved. In the DC sub-grid side, DC voltage level is maintained by the battery ESS and the bio-gas generator whereas the PV power generation is maximized via maximum power point track (MPPT) control. In the AC sub-grid side, the AC bus is defined by the main grid under the grid supporting/following operation or by controlling the grid tied inverter under the grid forming operation. The hybrid microgrid is developed and validated by Simscap-based Matlab/Simulink.