Volume : 9, Issue : 6, JUN 2023

NATIONAL CONFERENCE ON INNOVATIONS IN COMPUTING TECHNOLOGIES (NCICT'23)

A MODULATION TECHNIQUE TO IMPROVE GRID VOLTAGE BY USING STATCOM UNDER CASCADED H-BRIDGE MULTILEVEL INVERTER

DR.R. SHIVA KUMAR, S. YOGAPRIYA

Abstract

The modulated technique created for the balanced system allows Cascaded H-bridge Multilevel Inverter (MLI) to produce balanced voltage even when the grid voltage is unbalanced. The device over current in this scenario may be caused by the grid voltage's negative sequence component. Here, the grid voltage is split into its positive and negative phases first, and the STATCOM output voltage is likewise managed separately. However, there has not been a thorough investigation into how to calculate and synchronise the positive and negative sequence voltage. This work establishes a quantitative correlation between the positive and negative sequence voltages from the standpoint of power balancing. Additionally, it obtains the quantitative link between the positive modulation ratios. In this paper a cascaded multilevel inverter creates high voltage using several power electronic switches. Each h-bridge inverter produces different section of output waveforms. In order to produce a high voltage waveform, the output of the h-bridge is combined. The harmonic distortion of the waveform can be reduced by using several voltage levels, which also minimises the amount of electrical interference that is introduced in power system. Overall combining a STATCOM with a cascaded inverter offers a very effective and efficient method of compensating reactive power in systems. More flexibility in adjusting the output waveform to satisfy the unique needs of the power system is also made possible using different voltage levels. Simulation results show that proposed method is correct and effective.

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