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AN ECONOMICAL APPROACH OF DESIGNING A THREE PHASE GRID TIED INVERTER FOR SOLAR APPLICATIONS

G Suresh Babu1, U K Choudhury2, G TulasiramDas3, A Mahesh Kumar1
1.Department of EEE, CBIT, Hyderabad, India 500075.
2.GM (PEC&HR) BHEL Corporate (R&D).
3.VC-JNTU, Kakinada, AP.

Abstract—Solar power is undoubtedly substitute for conventional energy as the fossil fuels are getting depleted. As the magnitude of solar power extraction is meager, paves the way to get connected to common grid. In order to bridge the gap between the nature of output of solar power (DC) and common grid (AC) the necessity of three phase inverter arises. The solar grid tied system comprises of a Photo Voltaic (PV) array, DC to DC boost converter, three phase inverter, low pass filter and isolation transformer. The three phase inverter acts as a backbone of the system. An attempt is made in this paper to demonstrate the economization of designing a SPWM by replacing a analog transformer by digital counters. The internal architecture of three phase inverter includes Gate driver, Sinusoidal Pulse Width Modulation (SPWM), Phase locked loop( PLL) ,low pass filter, snubber circuit. As the PLL topology is matched, the synchronization of inverter with grid is virtually realized. The three phase inverter output is observed by CRO and also validated by simulation using MATLAB simulink.

Index Terms—Inverter, SPWM, PLL, Low pass filter

Cite: G Suresh Babu, U K Choudhury, G TulasiramDas and A Mahesh Kumar, "AN ECONOMICAL APPROACH OF DESIGNING A THREE PHASE GRID TIED INVERTER FOR SOLAR APPLICATIONS," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 1, No. 1, pp. 30-42, October 2012.