Mitigation of total harmonic distortion using cascaded MLI-DSTATCOM in distribution network

摘要

In this modern generation almost every power supplies are non-linear loads which contains electronic devices that do not conduct current over the full cycle of the applied voltage, and thus they introduce harmonics into the power network. Electronic front end of non linear load makes them more efficient than linear loads and these non-linear front ends are one of the source of harmonic. Harmonic is nothing but a signal or a wave having frequency is an integral (whole-number) multiple of the frequency of some reference signal or wave or fundamental frequency. Harmonic causes losses in the power distribution network and can lead to increased cost due to maintenance, failures or device de-rating and thus decreases the power quality of the power distribution network. Power quality may be defined as a set of electrical characteristics that allows a piece of equipment to function in its desired manner without any interruption and significant loss of performance or life expectancy. Total harmonic distortion (THD) is an important figure of merit used to quantify the level of harmonics in voltage or current waveforms. In this paper Distribution Static Compensator (DSTATCOM) with Synchronous Reference Frame based control which taking into account Three-Level Cascaded multi level Inverter for minimization of harmonics in Power System. This Three level Cascaded multilevel inverter supply low harmonics distortion, reduced number of switches, suppression of switching losses and take out the Total Harmonics Distortion (THD).