Hybrid quasi Z source multi output converter system with performance control and real time validation for photovoltaic microgrid

Abstract

Abstract This work demonstrates a real-time validation of a photovoltaic-based hybrid quasi-Z source multi-output converter system for microgrid applications. The conventional microgrid system consists of several converter systems designed to meet ac and dc power load requirements. This configuration makes the overall system bulky, increases costs, and reduces efficiency. However, in the proposed system, a hybrid concept is used to get multiple ac and dc power simultaneously in a single-stage conversion, which is a common requirement in the microgrid system. In this proposed system, photovoltaic arrays are used as input power with the perturb and observe-based maximum power point tracking algorithm to get the maximum power utilization of the PV system. Moreover, the proposed system consists of three outputs that are designed with a closed-loop control. Closed-loop control uses a new control method developed with the utilization of duty cycle and modulation index as independent control variables to control the ac and dc outputs. A detailed mathematical analysis of the proposed system is carried out, and the effectiveness of the presented control strategy is validated with simulation. Additionally, Hardware-In-Loop (HIL) validation is performed for a Typhoon HIL-based real-time emulation platform to evaluate the proposed system.