A Novel, PWM-Inverter Scheme for Grid Connected WEGS for Power Quality Measure

Injection of the wind power into an electric grid affects the power quality. The performance of the wind turbine and their power quality are determined on the basis of measurements, and according to the guideline specified in International Electro-technical Commission, IEC 61400-21.The influence of the wind turbine in the grid system concerning the power quality measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operation and these are measured according to national / international guidelines. The paper study demonstrates the power quality problem due to installation of wind turbine with the grid. The pulse width modulation (PWM) inverter scheme for the grid connected wind energy generation system for power quality improvement is simulated using MATLAB/SIMULINK in power system block set. Due to improvement in technologies, the wind turbine is expected to support the grid and therefore the wind turbine has to control the reactive power over a wide range, and also to deliver the reactive power, in case of voltage drop and can remain connected during short-term voltage drop. Hence to ensure its fulfillments, the power quality measure is specified in IEC 6140021.The development in the grid co-ordination rule and the scheme for improvement in power quality has been presented in the paper.