PQ Theory Controlled Statcom for Grid Connected Wind Driven Induction Generator for Power Quality Improvement

Abstract

Now a days Power electronic converters, ever more widely used in industrial, commercial, and domestic applications, suffer from the problem of drawing non-sinusoidal current and reactive power from the source. Like conventional power plants, wind power plants must provide the power quality required to ensure the stability & reliability of the power system. While connecting wind turbine to grid it is important to understand source of disturbance that affect the power quality. In general voltage & frequency must be kept as stable as possible. This stability can be obtained by using FACTS devices. Recently voltage-source or current-source inverter based various FACTS devices have been used for flexible power flow control, secure loading and damping of power system oscillation. Some of those are used also to improve transient & dynamic stability of wind power generation system (WPGS). The power arising out of the wind turbine when connected to a grid system concerning the power quality measurements, are: active power, reactive power, voltage sag, voltage swell, flicker, harmonics, and electrical behavior of switching operation. This paper proposes a control scheme based on pq theory for compensating the reactive power requirement of a three phase grid connected wind driven induction generator as well as the harmonics produced by the non linear load connected to the PCC using STATCOM. Finally PQ theory is proposed and applied to statcom for power quality improvement. Proposed concept simulated and verified by using Matlab/simulink software.