Development of non isolated DC to DC converters for integration of non conventional energy sources

Abstract

The non-conventional energy sources such as solar photovoltaic (PV), fuel cell, etc., and storage devices such as battery, ultra-capacitor, etc., are utilized in various industrial, domestic and transportation applications. Power electronic converters, i.e., commonly the DC-DC converters are used to interface these energy devices and provide power to the load/DC-link with an appropriate level of voltage/current. The non-isolated DC-DC converters are chosen over the isolated DC-DC converters because of their low cost, compact size, etc. Hybrid Energy System (HES) which contains of different non-conventional energy sources and energy storage devices, are used in various applications to provide reliable power to the load. Conventionally, the number of DC-DC converters are utilized to form such a HES. The utilization of such dedicated converters leads to high system complexity, more number of components, less efficiency, bulk in size, etc. To overcome the above demerits, the concept of Multiple Input single output DC-DC Converters (MICs) has been proposed. This research work aims to develop novel MICs to improve the performance of conventional MICs. A Dual-Input Super-Boost DC-DC (DISB) converter is proposed to integrate energy sources which have distinct voltage levels. The DISB converter is proposed for the Electric Vehicle (EV) application in this thesis. The proposed converter has the capability to operate in six different modes to utilize the input sources effectively. The converter utilizes a minimum number of conduction devices. Thereby, it achieves an improved efficiency. Operation and performance of the proposed converter under six different modes are validated through simulation and experimental studies. newline