To reduce the electric field stresses in the end-winding in hydropower generator bars, a field dependent grading tape is applied in the transition zone from outer corona protection to bare insulation. The design is typically optimized for 50/60 Hz with both low heat generation and optimal electric...
We consider a large time step (LTS) Roe scheme, originally suggested by LeVeque [Comm. Pure Appl. Math., 37(1984), pp. 463-477] which has attained increased popularity in recent years. The scheme is based on a wave formulation of the ordinary Roe scheme, and the assumption that waves interact...
A fully automated multi-disciplinary design optimization procedure for a Francis turbine runner has been developed in a previous task of the Horizon2020-HydroFlex project. The design optimization was limited to blade design, with the goal of improving the hydraulic efficiency and torque, and...
Maritime shipping is the backbone of the world economy, accounting for more than 75 % of global trade by volume. At the same time, international shipping is responsible for 2-3 % of global greenhouse gas (GHG) emissions, similar to the worldwide air travel industry. Ships currently use fossil fuels...
India has the second largest population in the world and is ranked number six in terms of CO(2) emissions generated from fossil fuels. A large portion of its power plants is old and inefficient, and it is expected that India in the coming 10-15 years will need to upgrade and extend its power sector...
Separations use as much as 15% of our energy consumption; the future of our planet may depend on the efficiency atwhich we capture CO , currently one of the boldest separation research areas. Recent developments in syntheticchemistry allow us to synthesize millions of different nanoporous...
Modular multilevel converters (MMC) for high voltage direct current (HVDC) application employ hundreds of sub-modules. Explicit modeling of sub-modules implies hundreds of nodes and semiconductor devices in the equivalent models for the system; this in turn poses a computational challenge for...
In recent years, CCS has gained additional attention as a possible means of meeting our climate improvement goals. With CCS demonstration projects under development, there is a need to focus on the widespread deployment of CCS and the technologies needed to make it viable. Upscaling CCS requires the...
This paper presents a method for treating transmission network bottlenecks in a stochastic market model, through a flow-based market clearing process. The market model is designed for long-term and medium-term scheduling of hydrothermal power system operation, where generators and loads are...