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Implementation of PI Active Power Control in a DFIG Based Wind Power System

A doubly-fed induction generator involves many mechanical, electrical, and power electronic sub-systems working in coordination with each other with the help of various control systems to produce a stable voltage and frequency profile at generator outputs inspite of varying wind speeds. PI control is the oldest, simplest and most reliable control scheme up-to-date and is being used in industries all over the world. This paper reviews various published works highlighting improvements in PI control of doubly-fed induction generators during last two years. The goals of this paper are to study the modifications made to the PI control of this machine and the extent to which these modifications were able to improve power control of this machine. The paper is concluded with implementation of 2 MW doubly-fed induction machine employing PI control in SIMULINK followed by a discussion on results of this simulated system and future improvements which will be made in this implemented system.