الفهرس 
OPERATION and MODELING of WIND TURBINE
Available Regions of a WT Generator SystemOnly 14 pages are availabe for public view
 |  | from | 127 |  |  |
| | | from | 127 | | |
Abstract
Recently, air pollutions are progressing in correlation with the increasing consumption of energy. The ever-increasing demand for conventional energy sources like coal, natural gas, and crude oil is driving society towards the research and development of alternative environmentally friendly energy sources. Thus the renewable energy sources (RES) should play a significant role. Among these RES available the wind and solar photovoltaic (PV) generation systems are the most widely used, since their technological progress has made them promising, mature, cost-effective, and reliable. However, the rapid increase of wind and PV powers penetration into the grid, influences system dynamics performance. Therefore, the control and stability of the wind and PV are discussed in detail to guarantee stable operation.
The Doubly-fed induction generator wind turbine (DFIG-WT) is a widely used option of the variable speed concept. Therefore, this thesis focuses on the different control schemes that can be implemented on the DFIG-WT such as a modified and adaptive nonlinear control scheme for maximum power tracking, a pitch angle control of the WT and a supplementary damping control (SDC) based on a crowbar connected to the rotor. Moreover, a precise analytical stability argument using a proposed integrated nonlinear dynamical model is presented. A comparison of crow bar protection of rotor is developed between three different types. Conditions for global asymptotic stability of the DFIG generator in the sense of Lyapunov are given in terms of the generator parameters and operating slip.
Moreover, a modified control methodology of three phase grid connected PV system at different solar radiation and temperature is introduced. This include the design of a modified incremental conductance algorithm to achieve the maximum power point (MPP) and a full decoupled current control strategy in rotating d-q synchronous reference frame for converting the maximum power to AC power. The study of effect of output capacitor of PV system is developed to show his effect on the system. Then, the stability of the photovoltaic system under different operating conditions is analyzed using the Lyapunov function. In addition, a modified dynamic stability based on zero dynamic design approach of feedback linearization is proposed.
The dynamic behavior of the DFIG-WT and PV systems is simulated in MATLAB/ Simulink interface programming to demonstrate the effectiveness of the proposed control strategies.