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The study of total harmonic distortion is the important factor in power electronic devices for predominately calculations and it is effects the technical issues and cost functions. The 13 level Cascaded H bridge with 1-Phase half Bridge LDN networks improving for effectiveness of analysis in THD. This paper main objective is finding the harmonic analysis with different frequencies by using data sheets and MATLAB circuits learning process. The simulation results obtained using Cascaded H bridge with LDN method for producing the 13 level output related to different THD values with different frequencies changing the load parameter values. This system explains about differences between two methods and reducing the no of switches for developing same output values, but THD values are important for design of filter combinations in power electronic devices and it is changes at different frequencies with amplitude values.THDanalysed with SPWM method in multilevel inverter.

The challenges faced in an isolated wind energy conversion system (WECS) are larger transient times, high steady-state error, and larger harmonic content. To overcome these issues, an adaptive voltage controller (AVC) along with the load current observer (LCO) could be the better proposition. However, the AVC and LCO, in conjunction with the conventional space vector pulse width modulation (SVPWM) technique to operate the three-phase inverter of WECS, would not be able to further improve these parameters. This paper proposes the use of the unified voltage SVPWM (UVSVPWM) technique along with the AVC and LCO, which could improve the transient behavior by about 30% as well as reduce the harmonic content of the load voltage and current by about 70% and 2%, respectively. This paper considers an isolated WECS connected to the linear load, which is operated under balanced as well as unbalanced load conditions. The proposed control technique is verified for both the balanced and unbalanced cases using MATLAB/Simulink.