A Statcom based PMSG wind energy system

Abstract

With ever increasing growth of the wind power, the large penetration of wind energy has brought opportunities along with challenges integrating it in the existing power system grid. A power system network is complex and the contingencies are inevitable. The energy generated from the wind is intermittent and need proper Maximum Power Point Tracking (MPPT) Algorithm with appropriate power electronics device. The situation is more difficult for variable speed PMSG system connected to weak grid. The grid codes are necessary to strictly comply with a set of rules that address reactive power control, power quality, voltage ride through to minimize the grid instability and power quality issues. STATCOM is one of the promising FACTS devices extensively used in solving power quality issues. This project studies the role of permanent magnet synchronous generator (PMSG) wind turbine system with STATCOM controller for reactive power compensation. A detailed model of the PMSG along with the dynamics of the converters have been included. DC link capacitor voltage of the back-to-back converter needs to be maintained within strict limits for smooth power transfer in the system. The STATCOM is placed at the terminal of the grid side converter. An independent P-Q controller is designed for STATCOM to provide the necessary reactive power to regulate DC link capacitor voltage and maintain stability. The simulation studies have shown that the proposed controller provides good damping and settles the transients satisfactorily following the disturbances.