Abstract
Power quality in distribution system has been the major issue now-a-days. Utility distribution networks, sensitive industrial loads and critical commercial operations suffer from various types of power quality problems like voltage sag, service interruptions total harmonic distortion (THD) etc. A voltage dip is a short time (10 ms to 1 minute) event during which a reduction in r.m.s voltage magnitude occurs.. Multi-level inverters are the best form to solve these problems. The general structure of multilevel inverter is to synthesize sinusoidal voltage waveform from several levels of voltages typically obtained from capacitor voltage source. In this paper both the Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) techniques are employed for the 3-level multi inverter and both these techniques are compared along with the application of STATCOM. All the results are studied through MATLAB Simulink by designing a 10KV, 400V, 50Hz system by applying 3-Ф to ground fault using RL load. Keywords: Multi-level inverter, SPWM technique, SVPWM technique, STATCOM, Total Harmonic Distortion (THD).
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