T-S Fuzzy Model based Large-Signal Stability Analysis of DC Microgrid with Various Loads

DC microgrid offers high efficiency, simple control, and reduced conversion stages advantages, but suffers from induced instability caused by its low inertia. Due to the strong nonlinearity of microgrid, analysis large-signal stability (LSS) is a very challenging task. This paper uses T-S fuzzy model (TSFM) method investigate LSS with various loads, which connected AC grid. The TSFM grid-connected voltage source converter (VSC) as main power supply established. carried out using an estimate domain attraction (DOA) working point. On basis DOA, effects different types loads system parameters on are researched. research results can serve guideline for adjusting physical control solve problem. Finally, (LSSA) performed MATLAB/Simulink simulation platform. confirm rightness proposed LSSA approach. They indicate that constant load (CPL) has greatest effect compared impedance (CIL) current (CCL). In addition, time-domain also validate effectiveness this method, way enhance through adjustment parameters.