Andrew Gong

Analysis of a three-port DC-DC converter for PV-battery system using DISO boost and SISO buck converters

Combining a storage device and renewable generation is one of the viable solutions to deal with the intermittency of renewable energy sources. Conventional methods of combining these components involve multistage and single-stage converters. However, there is a trade-off between efficiency and component count. A novel non-isolated three-port DC-DC converter which combines a dual-input single output (DISO) boost and a single-input single output (SISO) buck converters for a photovoltaic (PV) - battery-load system is proposed in this paper. There are five different operation modes to achieve different scenarios for maximum power point tracking, battery charging and load regulation requirements. Experiment results are given to confirm this proposed converter.

Analysis of a Fuel-Cell/Battery/Supercapacitor Hybrid Propulsion System for a UAV using a Hardware-in-the-Loop Flight Simulator

Fuel-cell based hybrid propulsion systems are being considered as a means to increase the endurance and range of small electric powered unmanned aerial vehicles. However fuel cell durability is limited by the rapid load changes requested by the autopilot. In a fuel-cell/battery /supercapacitor triple hybrid the battery provides boost power whilst the supercapacitor increases fuel cell life through load levelling. This paper presents the analysis of a fuel-cell/battery /supercapacitor hybrid propulsion system using a high fidelity hardware-in-the-loop simulator. The hardware-in-the-loop simulator allows accurate application of the expected dynamic electrical loads experienced in flight on the hardware components without the risks associated with flight testing. The triple hybrid system demonstrates load smoothing by the supercapacitor to the fuel cell under simulated operating conditions, with this buffering increasing fourfold under gusty flight conditions.