Simulation of a 4-Machine AC Microgrid System

AC microgrid multi-machine system simulation serves as a vital methodology for investigating microgrid operational characteristics, with the 4-machine system representing a typical configuration that effectively simulates distributed generation coordination scenarios.

When constructing this system in MATLAB/Simulink environment, focus on three key modeling layers: Power Source Layer - Typically includes heterogeneous units like PV systems, wind turbines, energy storage, and diesel generators, requiring configuration of corresponding power electronic interfaces and controllers Network Layer - Utilizes low-voltage AC bus structure, requiring setup of line impedance parameters and PCC (Point of Common Coupling) switch Control Layer - Implements droop control, power distribution, and mode switching logic, where both master-slave control and peer-to-peer control strategies can be validated

During simulation, phased testing is recommended: Frequency regulation during load switching in islanded mode Seamless transition during grid-connected to islanded mode changeover Circulating current suppression effects among multiple generation units

This model can be extended to study advanced issues like harmonic propagation and fault ride-through capabilities, providing data support for practical microgrid capacity configuration.