Analysis and Dual-loop PI Control of Bidirectional Quasi Z-Source DC-DC Converter
Santhoshkumar Battula, Man Mohan Garg, Anup Kumar Panda, Meher Preetam Korukonda, Laxmidhar Behera
Abstract
In a DC microgrid, energy management among distributed renewable energy sources, energy storage and load have been a major challenge. For the proper management of energy, a control scheme for bidirectional Quasi Z-Source DC-DC Converter (BQZSDC) has been presented in this paper. BQZSDC is buck-boost type of bidirectional DC-DC converter. It helps to integrate energy storage systems with energy sources and load. This paper presents the performance analysis of BQZSDC with dual-loop proportional integral control for regulating battery current and the load voltage. The controller parameters are tuned using stability boundary locus method based on desired phase margin. The performance of the controller has been validated in both discharging (Boost) and charging (Buck) mode. The MATLAB simulation results shows that the load voltage and battery current is satisfactorily regulated under load current variation in both discharging and charging modes.