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This paper investigates control and operation strategy of grid connected permanent magnet synchronous generator (PMSG) based direct drive variable speed wind turbine with a static synchronous compensator (STATCOM). The application of STATCOM enhances the system performance by improving the fault ride through capability of the wind turbine. Control strategies for generator side converter with maximum power extraction, grid side inverter and STATCOM controller are implemented in Matlab/Simpower. Moreover, a rapid synchronization by controlling the phase angle of wind energy system output is presented in this paper. Extensive simulations have been conducted and results show that STATCOM can enhance the steady state and dynamic performances of the wind energy system. The proposed synchronizer can synchronize the wind turbine with the grid rapidly during normal operation or after fault recovery. [ABSTRACT FROM PUBLISHER]

The variability and intermittency associated with the production of electricity by photovoltaic (PV) systems pose unique challenges to power systems engineers. Overcoming these challenges requires the use of computer models that accurately simulate the behavior of such systems. There is a dearth of such reliable and accurate models for PV systems study. This paper develops models for an integrated PV system which comprises the PV array, the SEPIC (single ended primary inductance converter) converter, bidirectional dc-dc converter, the inverter, and battery energy storage system using Matlab/Simulink. Control systems for maximum power point tracking and battery charge/discharge are implemented and used for simulations to study: 1) the response of the system to the ever-changing environmental variables, 2) the ability to track the maximum power point, and 3) the role of the battery energy storage in the mitigation of voltage and power oscillations. The simulation results are presented and discussed. [ABSTRACT FROM PUBLISHER]