• Vijay kumar Guntamukkala
• Mr. P. Sai Srinivas

Microgrid is a small-scale power supply network that can effectively integrate various sources of distributed generation such as renewable energy and other sources. Microgrid operates in grid connected and islanded mode. In this paper, microgrid configuration considered has a solar PV system along with normal AC source and utility grid. The generated power from renewable energy source like solar is always varying as it depends on the environmental factors such as temperature and sunlight (irradiance). Here, boost converter serves the purpose of stepping-up the voltage level and maintaining constant output D.C voltage. Solar PV is intermittent in nature so there is a need to interface DC-DC converter along with MPPT algorithm to extract maximum power point. The output of boost converter is given as input to the inverter. Here, three phase VSI model connected to the output of DC-DC converter and gate pulses to the VSI are provided from the output of PLL such that the microgrid should always be in synchronism with the utility grid. When microgrid operates without using filter at inverter output terminals, it contains harmonics and THD in isolated system is very high. So, filters are compulsory to reduce the harmonics and to required sine wave. This paper mainly presents a methodology of passive filters (LC, LCL) that are designed to mitigate the harmonics in the VSI output. The pulses for inverter in grid connected mode are generated by using parameters such as voltage, current and frequency as reference. Total harmonic distortion is one of the power quality issues which is considered and measured at various locations. Results for improvement in power quality are verified by using MATLAB/Simulink.

Microgrid (MG), Photovoltaic (PV) panels, MPPT, Perturb & Observe(P&O), Boost converter, VSI inverter, Power quality, LC filter, LCL filter grid connected system

"COMPARATIVE ANALYSIS AMONG LC AND LCL FILTERS IN A SOLAR BASED MICROGRID", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.49-61, September-2018, Available :http://www.jetir.org/papers/JETIR1809658.pdf

"COMPARATIVE ANALYSIS AMONG LC AND LCL FILTERS IN A SOLAR BASED MICROGRID", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp49-61, September-2018, Available at : http://www.jetir.org/papers/JETIR1809658.pdf