Open AccessGrid Interconnecting Solar Generation System Using Transformer Less Cascaded Seven Level Inverter
Author(s) -
Naveen Kokku
Publication year - 2019
Publication title -
international journal of scientific research in science and technology
Language(s) - English
Resource type - Journals
eISSN - 2395-602X
pISSN - 2395-6011
DOI - 10.32628/ijsrst196132
Subject(s) - total harmonic distortion , inverter , transformer , electronic engineering , grid tie inverter , pulse width modulation , computer science , voltage , network topology , topology (electrical circuits) , matlab , electrical engineering , control theory (sociology) , engineering , maximum power point tracking , control (management) , artificial intelligence , operating system
Multilevel inverter is a power electronic device that is used for high voltage and high power applications and has many advantages like, low switching stress, low total harmonic distortion (THD). Hence, the size and bulkiness of passive filters can be reduced. This paper proposes three topologies of a 7- level cascaded multilevel inverter with reduced number of switches with the 5-level cascaded multilevel inverter and 3-level inverter. The topologies consist of circuits with 9 switches for 7-level CMLI, 8 switches for the 5-level CMLI and 6 switches for the 3-level inverter. Apart from the reduction in switch count this paper also includes minimization of leakage currents and comparative analysis of levels of CMLI’s in every inverter connected to PV source. The control scheme based on Sinusoidal Pulse Width Modulation (SPWM) is adopted due to its ease of implementation. More number of levels results in reduced THD and nearly sinusoidal output. Simulation is performed using Matlab/Simulink.