World energy consumption is increasing substantially. Continuously increasing energy consumption will overloads the distribution grids as well as the power stations, therefore having a negative impact on power availability, security and quality. One of the solutions for overcoming this is use of renewable energy resources. The energy generation from PV (Photovoltaic) based DG is highly intermittent in nature because of continuous fluctuations in solar radiation intensity. When analyzing the factors affecting the performance of power generation from PV system the presence of harmonics in the inverter output posses a greater challenge in the grid integration. In this thesis basic theory of grid connected photovoltaic system and proposes a new scheme for Total Harmonic Distortion (THD) improvement in grid connected PV systems. A fuzzy logic control can be used to improve the THD in grid connected PV systems. A comparison of PI, hysteresis control and fuzzy logiccontrol gives the feasibility of the method. Thus the proposed scheme ensures that the THD in the injected grid current remains within the specified limits. MATLAB/Simulink model is developed for the proposed work. Simulation results are given to show the overall system performance.Experimental investigation is carried out on a 100kWp solar power plant at 9.36N, 76.36E in AJCE(Amal Jyothi College of Engg) to study the harmonics generation under varying climatic conditions.

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This The performance analysis of a solar power plant is very important from the point of view of technology and economy. The PV systems incorporate power conditioning units, which are harmonic generating devices. Thus have an influence on the quality of supply, reliable operation of system equipments and life of the system components. The harmonics generated at the output of the solar power plant depends on the input to the power conditioning unit, which further depends upon the PV system operating conditions like module operating temperature, solar insolation, shading and dusting on the module. This paper presents the performance of a 100KW solar system over a period of time. The performance ratio of the system is evaluated and analyzed.

Solar energy technologies have gained much importance in the recent scenario due to their ability to produce clean, reliable, useful power. Grid connected Photovoltaic system requires conversion from DC to AC to harness the useful energy produced. A Photovoltaic inverter directly connected to the grid can cause, besides the generation of several current harmonics, a DC current component injection. Excessive DC current injection into the AC network can result in problems such as increased corrosion in underground equipment and transformer saturation. The paper aims at evaluating the output DC-current injection in grid connected inverter used for a 100kW solar power plant installed at Amal Jyothi College of Engineering, Koovapally, through experimental analysis. A simulation based study on output DC current injections in inverters with two different multilevel topologies is also conducted.