This report elaborates on the possibilities for reducing computation time in the Fansi power market model by applying relaxation techniques and temporal decomposition. Findings and conclusions are supported by computational experiments conducted on a realistic large-scale dataset. Relaxation of...
This paper discusses the transient control of a system for dynamic inductive power transfer to an electric vehicle when passing a road-side coil section. A series-series-compensated topology with minimum number of passive components is assumed and a slight detuning of the resonance frequencies is...
This article introduces a modulation technique for modular multilevel converter (MMC) in variable speed traction drives for electrical transportation referred as windowed pulsewidth modulation (W-PWM). The windowed PWM (W-PWM) is derived by blending the principles of operation of conventional...
This paper presents vehicle-to-grid (V2G) tests performed in the microgrid at university Campus Evenstad, Norway. The purpose of the tests was to investigate the power quality in the connection point to the grid during transitions to/from island mode. These transitions are generated by disconnecting...
High-power charging stations have recently drawn the attention of many researchers and electric vehicle (EV) infrastructure industries. However, the installation of fast chargers at various corridors of highways and cities can cause high peak loads and voltage deviations in distribution networks. In...
To keep a stable power system, there should always be balance between the generation and consumption of electricity. In this study, a flexibility modelling method for atomic loads which is based on high resolution appliance measurement data is presented. The method embraces the potential...
This paper presents results from laboratory measurements of partial discharge (PD) activity in 50 cm long samples cut from the mainwall section of old hydrogenerator stator bars. All stator bars were manufactured in 1976 and samples were taken after 35 years in service from both the low and high...
Modern society is to a larger and larger extent dependant on electric energy, and hence the reliance on and utilization of the electric grid is increasing steadily. At the same time the production and consumption patterns are changing from large centralized generation of electric power and pure...
Droop control has shown promising results for decentralized power sharing in microgrids. However, the basic scheme can suffer from unequal reactive power sharing power due to differing line impedances between converters and due to the predominantly resistive nature of low voltage networks. Virtual...
This paper presents a comparison of small-signal dynamics for a current controlled Virtual Synchronous Machine (VSM), a voltage controlled VSM and a df/dt-based control strategy for inertia emulation. The comparison is based on state-space models of the considered control schemes, which are...
A new flexible supermarket R-744 refrigeration unit has been implemented in the laboratories at NTNU/SINTEF. The unit is fully equipped with real display cabinets for both medium and low temperature, as well as seven large volume counter flow glycol heat exchangers to simulate the entire load of a...
The spreading of electric vehicles led to a renewed interest for innovative traction drives. In this context, an electric traction drive based on a Modular Multilevel Converter and integrating batteries in each module has been recently proposed. This converter concentrates into a single unit, the...