This paper presents the high gain step-up BOOST converter which is essential to step up the low output voltage from PV panel to the high voltage according to the requirement of the application. In this paper a high gain BOOST converter with coupled inductor technique is proposed with the MPPT control. Without extreme duty ratios and the numerous turns-ratios of a coupled inductor this converter achieves a high step-up voltage-conversion ratio and the leakage energy of the coupled inductor is efficiently recycled to the load. MPPT control used to extract the maximum power from PV panel by controlling the Duty ratio of the converter. The PV panel, BOOST converter and the MPPT are modeled using Sim Power System blocks in MATLAB/SIMULINK environment. The prototype model of the proposed converter has been implemented with the maximum measured efficiency is up to 95.4 % and full-load efficiency is 93.1 % .

This paper presents a novel grid-connected boost-full-bridge photovoltaic (PV) micro-inverter system and its control implementations. The concept of micro-inverter is a future trend for grid connected Photovoltaic micro-inverter. Increasing demand on the renewable energy sources has made the grid connected inverter systems to be more important than ever before. Maximum Power Point Tracking (MPPT) technique is implemented which is used by the grid connected inverters to get the maximum possible power from one or more photovoltaic devices, typically solar panels. Z source network is used to get the steady state. Interleaving of the Boost DC-DC converter is carried out to get more boost up voltage and better efficiency. A new multilevel inverter topology constituting of a H-bridge structure with four switches connected to the dc link. Based on Phase Opposition Disposition technique a new PWM method requires only one carrier signal is suggested.

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There are many problems arising in the electrical networks. In that, voltage fluctuation and power loss reduction becomes a major drawback in the electrical power supply system. Hence it is necessary to enhance the system power flow by placing suitable facts devices. The placement of FACTS devices in suitable location can lead to control the flow of current and maintain bus voltages in desired level and reduce the losses. The facts devices like Upfc, Ipqc, Dpfc are compared with each other and the higher efficiency converter is identified. Finally, the location for better efficiency is traced out. Back-to-back connection between the shunt and series converters is given for the control capability of UPFC, which allows the active power to freely exchange. UPFC has a DC link whereas DPFC does not have any DC link. It is connected directly to the transmission line to control the hysteresis loss. Optimal location and better efficiency of UPFC, IPQC and DPFC are found out and the devices are placed at the exact location. This project presents one of the Bang-Bang Controller to seek the optimal location of FACTS devices in a power system Proposed algorithm is tested on IEEE 14 bus power system for optimal location of multi-type FACTS devices and the results are presented.