Conventional Symmetrical components are divided into three categories such as Positive, negative and Zero Sequence Components. Now I proposed the different analysis of the symmetrical components using polar coordinate theory which we used in Vector fields namely Cylindrical coordinate system and Spherical Coordinate system. First we represent the three sequence voltages in three coordinate (Cartesian) system. I just name the space for representation of the magnitudes of symmetrical components as "Symmetical Component Space(SCS)". Alternatively, we may call the Space as "ZPN Space". The main purpose of this analysis is to simplify the voltage unbalance analysis, and factor estimation. Cartesian coordinate system of ZPN components are converted into two polar coordinate system. A. Cylindrical Angular Symmetrical Components (CASC) ...
ARIIDTM - A Research on Innovative Islanding Detection Technique for Microgrid - Research Thesis by Dr.V.Arivumani
Abstract: Islanding detection is a way of protecting the renewable energy integrated Microgrid from the power grid network during abnormal conditions like hazards, faults, etc. Various islanding detection methods (Passive, Active, Hybrid and Remote methods) are implemented with new technologies to protect renewable energy-powered Microgrids integrated with the power grid network. However, among these methods, Passive methods are preferred and reported in most of the literature due to their known feasibility. These methods are straightforward to model with few processing elements, fewer computational requirements, and faster detection of islanding events without affecting the power quality. Yet, these methods have larger NonDetection Zone (NDZ) in which the islanding is not performed for minor power mismatches. Other than a voltage-frequency relay, most practices have less NDZ but more interrupted tripping, affecting the Microgrid's equipment. In this research, islanding detection i...