High-Power Multiport Dc-Dc Converter For PV Farm Applications

Abstract

The trend toward generating electricity from renewable energy sources has encouraged researchers to work on finding more reliable and efficient ways of combining various sources, storage systems, and loads with different voltage ratings. Using the conventional structure of integrating multiple sources is proven to be less efficient and more expensive. This has led to the development of the multiport DC-DC converter, which provides a localized energy processing model with a centralized controller. This research studies the operation and characteristics of the multiport DC-DC converter, specifically for medium-voltage and high-power applications. The steady state and the dynamical modeling of the multiport DC-DC converter are presented in this work. A mathematical representation of the average current model is derived, and it is used to obtain the linearized model of the multiport DC-DC converter. Non-Overshooting state feedback controller is designed and implemented for a five-port converter, and its performance is compared with the conventional optimal control scheme. In addition, fault analysis is carried out by studying the system response under different fault scenarios and evaluating the controller’s ability to adjust the power flow between the ports.