الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
 |  | from | 158 |  |  |
| | | from | 158 | | |
Abstract
With the enormous stress of energy lack and air pollution, renewable energy sources such as photovoltaic sources become an effective solution to solve these problems. The penetration of
inertia-less photovoltaic sources into power system has adverse effects on the overall system inertia which threatens system stability. As a solution for this problem, virtual inertia technique
can be used as a system controller in order to enhance the system performance and maintain its stability. In this thesis, an introduction and a literature overview of virtual inertia is introduced.
After that, an overview of photovoltaic sources and its construction are presented. Furthermore, the global status of photovoltaic energy and Egypt status in this field are introduced. The contributions in modeling photovoltaic cells throughout the history and to date are discussed. Also, Photovoltaic systems such as stand-alone systems and grid-connected systems are introduced. Simulation study using MATLAB software is done to investigate the system
performance under different operating scenarios. After that, the concept and the classification of virtual inertia topologies such as synchronous generator model based, swing equation based,
frequency-power response based, droop control based, and other various topologies are introduced. Moreover, a comparative assessment of VSG control method using simulation study
with MATLAB software is presented. The system response is investigated under different operating scenarios such as starting, load increase, load decrease, islanding with heavy load, islanding with medium load, islanding with light load, and irradiance change. Although the
merits of these techniques, traditional VSG control methods have some of shortcomings such as the long transient time and the high overshoot magnitude in system response. In order to enhance the system performance, an adaptive virtual synchronous generator controller based on the oscillation motion of the synchronous machine is presented. Then, the fuzzy logic controller is introduced with the adaptive VSG. Simulation study using MATLAB software is presented to evaluate the validity of the adaptive VSG with fuzzy logic controller and to compare between the system response with the adaptive VSG with fuzzy logic controller,
conventional VSG, droop control and without virtual inertia. The system response is investigated under different operating scenarios. Upon the results, there is an enhancement in the syste response by using the adaptive VSG with fuzzy logic controller and this emphasizes the effectiveness of using such controller with PV systems over the above mentioned techniques. For more enhancing in the system performance, a proposed VSG with ANFIS is presented as an inverter controller. The implementation of the proposed VSG with ANFIS controller with
MATLAB software for PV system is presented and compared with the adaptive VSG with fuzzy logic controller, the conventional VSG and without virtual inertia controller. The system response is investigated under different operating scenarios such as starting, load increase, load decrease, islanding with heavy load, islanding with medium load, islanding with light load, and irradiance change. By studying the system performance, there is a superiority of the proposed control over the above mentioned techniques.
To verify the effectiveness of the proposed adaptive VSG, an experimental setup is presented with real-time implementation for the system using dSPACE DS1104 interfacing with MATLAB software and the system response is investigated under different operating scenarios.
Upon the presented results, there is an enhancement in the system response when the proposed adaptive VSG with ANFIS controller is used and this emphasizes the superiority of using such controller in PV systems over other techniques.