الفهرس | Only 14 pages are availabe for public view |
Abstract The aim of the thesies is to investigate the impact of gust as case of wind speed variation on the stability of wind farms composed of fixed speed wind trubines based on SCIG and on the stability of wind farms composed of variable speed wind trubines based on DFIG.The continuous increasing in the pollution level and in the same time increasing in fuel price are factors lead to the increase in using renewable energy sources specially wind energy. Wind power production faces many challenges, one of the important challenges is that of the rapidly change in wind speed which depends on the weather condition. A change in wind speed affects on the generated power from wind turbine. SCIG and DFIG are famous kinds of wind turbine, each of them has advantages and disadvantages, SCIG is cheap but its operation has a harmful effect on system stability. DFIG keeps the system stable but it is very expensive technology for many countries. The thesis proposes a gust as a case of wind speed variation. The thesis uses Matlab/Simulink program to simulate the wind speed variation according to International Electrotechnical Commission 61400-1 (IEC 61400-1). The thesis focuses on the impact of gust which represents the wind speed variation according to reference IEC 61400-1 on stability ofwind farm connected to grid when the wind farm is composed of Squirrel Cage Induction Generator (SCIG) and when it composed of Double Fed Induction Generator (DFIG). The thesis investigates the stability of wind farm by studying the voltage stability as one of power system studies. In this thesis the voltage stability analysis is achieved by using two different kinds of Voltage Stability Indices (VSI) indicated by VSI_1 and VSI_2 which are used to indicate the voltage stability condition.The thesis designs a hybrid wind farm consists of an equal number of SCIGs-based wind turbine and DFIGs-based wind turbine without STATCOM connected to wind farm. The thesis designs this kind of wind farm to overcome the instability of SCIG and expensive price of DFIG. Key words: IEC 61400-1, Gust, Squirrel Cage Induction Generator (SCIG), Double Fed Induction Generator (DFIG), Hybrid wind farm and Voltage Stability Index (VSI).THESIS ORGANIZATION Thesis is organized in 7 chapters. Notation, list of table, list of figures and abbreviations are shown after the list of contents. Literature references are mentioned in square brackets by numbers. Equations are numbered in format (x.y) and figures are numbered in format Figure x.y where x is the chapter number and y is the number of the item. |