Harmonics is the most important issue among all issues related to the power quality. Harmonics comes from different non-linear loads like uninterruptible power supplies systems (UPS), variable speed motor drives, rectifiers, personal computers, adjustable speed drives, fluorescent lighting, rectifier banks, data processing loads, arc furnaces, and so on. Simulation of a real power supply system that consists of linear loads and nonlinear loads as variable speed drives has been carried out in the work. Variable speed drives generate harmonics into supply system that contains different values of compensated capacitors. Calculations of equivalent system reactance for generated harmonics, voltage harmonics, voltage harmonics in percentage, THD (Total Harmonic Distortion) of voltage, frequency characteristics, current flows in the system capacitor units have been worked out using Mathcad software. The obtained results have been compared with the European Standard (EN 50160) for supply quality requirements of the European Union.

Because of fossil fuels cost is high and environmental issues pushes to renewable energy sources to be used significantly. One of these wind energy got a lot of investments. It is difficult for good power quality due to the behavior of wind turbine speed. It effects on the power and voltage of the component that connect with the wind turbine. A new technique must be developed and new control must be used to control the fluctuations and improve wind power performance. Also using possible excitation induction generators for safety issues. More over the smoothening wind power variation done by using some energy storage technologies. Using a static compensator for the harmonic current injection and reactive power compensation. Besides of improving power quality of wind turbine also the fault tolerance. Dynamic voltage restorer used to treat the reactive power compensation connected to a wind turbine.

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