Modeling and simulation of a DFIG RES generation system for small and growing grids

Abstract

The increasing population and hence increase in the demand for electric power calls for ways for increasing power generation most especially from the Renewable Energy Sources (RES) like wind and solar PV. That is why the integration of these RESs of power to the grid is on the increase. This is as a result of favorable government policies, effort of minimization of greenhouse gases production and the natural abundance of RES. This is also in line with the grid’s evolution to smart grid requirements. Among the many RESs the Doubly Fed Induction Generators is the most used wind energy conversion system because of high efficiency, environmentally clean and ease of being integrated to the grid. In addition to this, the DFIG is gaining popularity in applications because its speed can be varied hence cops up very well with the wind speed variation for different places and times. However, these RESs have different characteristics and thus poses different operating challenges. This calls for proper prior investigations and analysis of these challenges for particular grids in mind before actual integration to the system. In line with this smart grid concept, in this paper we have designed, modelled and simulated the various aspects, different load condition of DFIG wind system integration to small and growing grids for countries like Kenya in MATLAB/Simulink platform. Keywords-DGs, RESs, Rotor Side Control, Grid Side Control, PWM, DFIG