Control of grid Connected Split Source Inverter using Decoupled Control Scheme

Abstract

The use of an additional boosting stage is mandatory for applications such as fuel cells-based systems, which are characterized by a low and unregulated input voltage. The increasing number of renewable energy sources and distributed generators requires new strategies for the operation and management of the electricity grid in order to maintain or even to improve the power-supply reliability and quality. In addition, liberalization of the grids leads to new management structures, in which trading of energy and power is becoming increasingly important. The power-electronic technology plays an important role in distributed generation and in integration of renewable energy sources into the electrical grid, and it is widely used and rapidly expanding as these applications become more integrated with the grid-based systems. In this thesis, the SSI is controlled by a single parameter, i.e., its dc and ac sides are controlled by the modulation index; it is of paramount importance to investigate its control scheme in grid-connected mode, which has never been studied yet. Models of the SSI dc side and proposes a modified modulation scheme combined with the commonly used synchronous reference frame control technique to achieve a decoupled control scheme of the SSI in grid-connected mode, i.e., the dc and the ac sides of the SSI can be controlled independently, which is convenient for many applications.