Islanding Detection Active AFD Algorithm Model and Its MATLAB Implementation

In this article, we will explore the detailed aspects of the islanding detection active AFD algorithm model and its MATLAB implementation. We will first introduce the concept and importance of islanding detection, then delve into the principles and applications of the active AFD algorithm model. The algorithm typically involves injecting specific disturbance signals and monitoring system responses using functions like voltage/frequency measurement blocks and phase-locked loops (PLL). Next, we will discuss in detail how to implement this algorithm in MATLAB, including code examples with explanations covering key functions such as signal generation modules, threshold comparators, and timer-based detection logic. Finally, we will examine the algorithm's limitations and potential improvement directions, along with possible application scenarios and future research avenues involving grid-tied inverter systems and microgrid protection schemes.