Z- SVPWM Based Source Transformer Less Five Level Cascaded Inverter with Grid Connected Photovoltaic System

Authors

  • P. Marish Kumar , R Palanisamy

Abstract

Multilevel inverters are presently a very desirable option for high-power medium-voltage switching applications;
they transform DC power to AC power at the appropriate output voltage and frequency stage. Specific topologies
were developed in the design of multilevel inverters. For the single-phase five-level inverter, a new solar input
dependent space vectoriPWM (SVPWM) algorithm is introduced, and the source of the DC-side condenser voltage
imbalance is examined. In order to reduce the switching failure and prevent the sudden transition in the output
voltage vectors, an efficient SVPWM algorithm is suggested, It allows use of six-vector modulation in which the first
output vector is the positive (or negative) small vectors. The technique of adjusting the voltage change coefficient is
suggested to modify the effective time of the positive and negative small vectors to regulate the possible neutral point
equilibrium, which is focused on detecting the position of the load current and the capacitor voltage. The validity of
the latest SVPWM approach is checked by simulation using a MOSFET inverter of five stages. Comparison of
various PWMS & various stage inverters with all parameters such as voltages, currents, & THD is checked. The
proposed topology required less switches and carrier signals, and less THD of the proposed topology than
traditional topologies.

Published

2020-03-31

Issue

Section

Articles