Analysis of the Dynamic Interface among Doubly Fed Induction Generator Wind Farms and the Egyptian Transmission Network

Abstract

For the last two decades, there has been a tremendous increase towards the penetration of wind power as a source of electricity production all over the world. With the existing wind power plants and the more that are to be planned, there has been a great importance to analyze wind farm(s) interaction with the power system. As it is now obvious, many large wind farms utilize the variable speed doubly fed induction generator wind turbine concept. In this context, it has become necessary to be able to model the DFIG, the wind turbine together with their control and protection circuits adequately. In this paper, the main contribution is to analyze the interaction between a wind farm utilizing such a wind turbine concept and the Egyptian transmission grid using the DIgSILENT simulation software. The wind turbine power curve, the principle operation of the DFIG, its components and the control systems were thoroughly investigated. By applying the concept of aggregation techniques, a simulation study was performed by connecting a wind farm to the Egyptian power grid. The main concern of the study was to investigate the impact of a grid fault on both the electrical and mechanical systems of the turbine. The study results indicate that the wind farm response is shown to be promising.