The static converters used in third generation (DFIG) and fourth generation (permanent magnet synchronous generator (PMSG)) wind turbines are the most important factors of harmonic generation and propagation, and power quality reduction in distribution networks. The harmonics, inter-harmonics, and supra-harmonics would cause the voltage fluctuations, depression, disruption and imbalance in power, fluctuations in network frequency, low frequency induction in voltage, develop DC voltage in AC network, induce the continuous electromagnetic waves in the current and voltage waveforms, and cause the transient instability, oscillatory instability and visual flicker in the monitors (CRT). DC currents in AC networks can cause damage such as transformer saturation, and stress in insulation parts of equipment. The noises in AC networks have adverse effects in the intensification of the Earth system. In this article, the evaluation of the effects of harmonics, inter-harmonics, and supra-harmonics caused by switching the back to back converter of double fed induction generator of a wind unit connected to the distribution network in causing the fluctuations in network frequency, developing DC voltage in AC network, and voltage noise emission in Matlab software is simulated in real-time manner, and analyzed based on the criteria and requirements of IEC61000-4-30 standard.