Fixed Frequency Integral Sliding Mode Control for Bidirectional Switched Quasi Z-source DC-DC Converter in Standalone PV Connected System

Abstract

Nowadays, energy management in a microgrid consists of distributed renewable energy sources, and distributed energy storage has proven to be a major challenge. The difficulty is successfully managing the dynamic renewable sources, the storage system, and the loads simultaneously. This paper presents a Bidirectional Switched Quasi Z-source DC-DC Converter (BSQZSDC) to integrate an energy storage system with a PV-connected common DC bus. A fixed frequency integral sliding mode controller (FF- ISMC) is used to regulate DC-Link voltage with good dynamic response in the proposed system. The FF-ISMC reduces steady-state errors and provides stable control even when the load changes significantly in both modes operations of BSQZSDC. The controller operates satisfactorily in achieving the voltage regulation objective, as per simulations conducted in MATLAB/Simulink. Finally, the proposed performance of the controller is verified using an experimental setup.