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Characterization of a novel counter-rotating twin harmonic PM machine
(Chapter, 2023)Most machine topologies have two-ports, with one set of electrical connections and one mechanical shaft. Three-port machines having two rotors and mechanical shafts are able to drive two mechanical loads using one stator ... -
Characterization of body diodes in the-state-of-the-art SiC FETs-Are they good enough as freewheeling diodes?
(Chapter, 2018)This paper investigates the switching phenomenon of body diodes in the state-of-the-art discrete SiC FETs. A comparative performance evaluation of the body diodes in planar and double-trench SiC MOS-FETs, and trench cascode ... -
Charge accumulation on slightly conductive barrier systems and its effect on breakdown voltage in an air insulated rod plane arrangement
(Chapter, 2020)The barrier effect has been known since the 1930's. It is of great importance in the field of high voltage engineering as the breakdown voltage of an electrode arrangement can be increased significantly when dielectric ... -
Classification and analysis of impact on small-signal dynamics and stability from expansion of VSC-HVDC systems to multi-terminal HVDC grids
(Chapter, 2017)This paper presents a structured approach for analysing the effect of HVDC transmission system expansion on the small signal dynamics. The methodology decomposes the expansion of the system into a sequence of steps and ... -
Comparative Assessment of Supervised Learning ANN Controllers for Grid-Connected VSC System
(Chapter, 2022)The widely used PI-controller imposes certain performance limitations when used for the grid-connected VSC systems. Model predictive controllers (MPC) can eliminate these inherent issues of PI-controller but in trade-off ... -
Comparative evaluation of a commercially available 1.2 kV SiC MOSFET module and a 1.2 kV Si IGBT module
(Chapter, 2016)In this paper, a comparative performance evaluation of a 1.2 kV SiC MOSFET module and a 1.2 kV Si IGBT module is carried out under a series of different conditions such as similar dv/dt, di/dt, voltage overshoot, current ... -
Comparison of Cost Allocation Strategies among Prosumers and Consumers in a Cooperative Game
(Chapter, 2018)As the higher penetration of distributed generation (DG) and electrical energy storage (EES) is emerging, end-users are taking a more active role in the power grid. With an increased amount of DG and EES available, ... -
Comparison of Current Control Strategies in Modular Multilevel Converter
(Chapter, 2018)There is a need to transmit the power generated from windfarm in remote locations to the residential and industrial load. One of the suitable and economic solution for such long distance transmission of power is the High ... -
Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway
(Chapter, 2018)Stator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition ... -
Comparison of Voltage Stability Indices Based on Synchronized PMU Measurements
(Chapter, 2023)The need for reliable information about the status of electrical power systems is an increasingly relevant concern within the current trend of electrification and deployment of power electronics-based devices. In this ... -
Computational Efficiency Assessment of Multi-Period AC Optimal Power Flow including Energy Storage Systems
(Chapter, 2018)In this paper, firstly, a formulation for Multi-Period AC Optimal Power Flow is developed to incorporate intertemporal constraints and, specifically, equations representing energy storage systems. Secondly, a solution ... -
Condition Assessment of Hydrogenerator Stator Bar Insulation Using Partial Discharge Measurements
(Chapter, 2018)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 ... -
A Condition Monitoring Method for Solder Layer Degradation of Liquid-Cooled Power Semiconductors
(Chapter, 2023)This paper presents a new method for condition monitoring of solder layer degradation of liquid-cooled power semiconductors. Solder layer degradation is detected by an increased thermal impedance, which has the effect that ... -
Condition Monitoring of Wound Field Synchronous Generator under Inter-turn Short Circuit Fault utilizing Vibration Signal
(Chapter, 2020)In this paper, a novel frequency index for Inter Turn Short Circuit (ITSC) fault diagnosis of the Wound Field Synchronous Generator (WFSG) is presented by utilizing the air gap flux density and the total force density. The ... -
Considerations on Communication Infrastructures for Cooperative Operation of Smart Inverters
(Chapter, 2019)The presence of distributed generation systems spread over low-voltage electrical networks is boosting the development of control methodologies aiming at coordinating and cooperatively managing the existing smart inverters. ... -
Continuous-time scheduling of a hydrothermal system with integration of offshore wind power
(Chapter, 2020)In this work, a continuous-time unit commitment formulation of a hydrothermal system with integration of offshore wind power is used to model the North European system operation. The cost of covering the structural imbalances ... -
Control of DC-capacitor peak voltage in reduced capacitance single-phase STATCOM
(Chapter, 2016)This paper discusses the design and control of a single-phase STATCOM with reduced dc capacitance. It is first demonstrated how operation with reduced dc capacitance and large dc voltage oscillations can be possible without ... -
Control strategies for residential battery energy storage systems coupled with PV systems
(Chapter, 2017)This paper presents, and compares the performances of four control strategies for residential battery energy storages coupled with photovoltaic (PV) energy systems. The control strategies are: 1) rule based control, 2) ... -
Control Strategies for Variable Speed Operation of Pumped Storage Plants with Full-size Converter Fed Synchronous Machines
(Chapter, 2021)The full-size converter fed synchronous machine (CFSM) for variable speed operation of a pumped storage power plant exhibits multiple advantages over the state-of-the-art Doubly Fed Induction Machine (DFIM) technology. The ... -
Coordinated Control of Parallel Power Conditioners Synthesizing Resistive Loads in Single-Phase AC Microgrids
(Chapter, 2019)Without proper coordination, power conditioners within microgrids are prone to suffer from resonance phenomena due to the complex and dynamic interactions among the main grid, nonlinear loads and distributed converters. ...