Abstract
An AC microgrid system model is created to assess transient and steady state stability during periods of separation from the grid. A secondary control is constructed to dispatch energy sources according to user selected setpoints and participation factors. Two sources — an energy storage device and synchronous generator — are controlled to share active and reactive load burdens. A system load models the difference between solar and wind powered generation and load. First order differential equations are written to describe the system, and implemented in Simulink. The model components carry a high level of detail to capture all relevant modes. Systems include an eight (8) state salient pole synchronous machine, AC8B regulator, prime mover, equivalent π cable, RL microgrid load, ideal battery and basic inverter model, and a detailed LCL filter at the inverter output. A detailed model of the inverter primary control is included, and a secondary level control which distributes the power error according to user defined participation factors is proposed.
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