Browsing NTNU Open by Author "Hoidalen, Hans Kristian"
Now showing items 1-17 of 17
-
Analysis and evaluation of Intersystem Fault ina Hybrid AC/DC Power System and its impact on the protection System
Torres Olguin, Raymundo E.; Saha, Murari Mohan; Hoidalen, Hans Kristian (Journal article, 2019)Due to increasing environmental burden and other cost related reasons, the transmission network is undergoing major change globally. One way to utilize transmission corridors more efficiently is to have several three-phase ... -
Analysis of gray Box Modelling of Transformers
Hoidalen, Hans Kristian; Rocha, Angelica C.O. (Journal article; Peer reviewed, 2021)Calculation of power system transients involving transformers require models that incorporate capacitive behavior. The paper outlines how classical low-frequency transformer models can be extended with capacitances and ... -
Estimating distance to transient and restriking earth faults in high-impedance grounded, ring-operated distribution networks using current ratios
Treider, Thomas; Hoidalen, Hans Kristian (Peer reviewed; Journal article, 2023)Earth faults occur frequently in distribution networks, and in resonant grounded networks they are challenging to locate precisely due to their naturally low fault current. Transient and restriking faults are more challenging ... -
Experimental validation of a new impedance based protection for networks with distributed generation using co-simulation test platform
Pandakov, Konstantin; Adrah, Charles Mawutor; Hoidalen, Hans Kristian; Kure, Øivind (Peer reviewed; Journal article, 2019)Combined real-time hardware-in-the-loop simulations and modeling of communication networks (co-simulation platforms) is a powerful test-bed for development and validation of relay protection schemes utilizing communication ... -
Fast protection against islanding and unwanted tripping of distributed generation caused by ground faults
Pandakov, Konstantin; Hoidalen, Hans Kristian; Marvik, Jorun Irene (Chapter, 2017)Ground faults (GF) in a feeder with interconnected distributed generation (DG) might lead to overvoltages in healthy phases even after feeder disconnection from a substation, obstacles for reclosing schemes, and safety ... -
Hardware-in-the-loop testing of impedance protection with compensation of fault impedance and DG infeed current
Pandakov, Konstantin; Adrah, Charles Mawutor; Liu, Zhou; Hoidalen, Hans Kristian; Kure, Øivind (Journal article; Peer reviewed, 2018)The standard impedance protection deployed in distribution networks can malfunction due to underreach errors caused by fault impedances and remote infeed currents from embedded generators (becoming more and more widespread). ... -
High frequency wind energy conversion system for offshore DC collection grid — Part II: Efficiency improvements
Holtsmark, Nathalie Marie-Anna; Agheb, Edris; Molinas Cabrera, Maria Marta; Hoidalen, Hans Kristian (Journal article, 2016)This is the second part of a two-part paper dealing with a high frequency wind energy conversion system for series-connected DC wind turbines. In part I, the efficiency of the AC–AC converter and high frequency transformer ... -
High frequency wind energy conversion system for offshore DC collection grid—Part I: Comparative loss evaluation
Agheb, Edris; Holtsmark, Nathalie Marie-Anna; Hoidalen, Hans Kristian; Molinas Cabrera, Maria Marta (Journal article, 2016) -
IEC 61850 Goose Managing applications in distribution network protection and automation
Grebla, Maciej; Yellajosula, Jaya; Hoidalen, Hans Kristian; Marvik, Jorun Irene (Journal article; Peer reviewed, 2019)Introducing distributed generators into distribution networks creates problems for protection systems like electric island formations or protection blinding. Possible solutions utilizing communication aided automation in ... -
Improved Zone 1 Top-line Tilting Scheme for Polygonal Distance Protection in the Outgoing Line of Type-4 Wind Parks
Ma, Kaiqi; Hoidalen, Hans Kristian; Chen, Zhe; Bak, Claus Leth (Journal article; Peer reviewed, 2023) -
Influence of voltage harmonics on transformer no-load loss measurements and calculation of magnetization curves
Ramamurthy, Jayanth R.; Chiesa, Nicola; Hoidalen, Hans Kristian; Mork, Bruce Andrew Knut; Stenvig, Nils M.; Manty, Adam C. (Journal article; Peer reviewed, 2017)This paper investigates the voltage distortion phenomenon during no-load testing of transformers, its influence on no-load loss calculations, and a novel measurement technique that is unaffected by harmonics for obtaining ... -
Misoperation analysis of steady-state and transient methods on earth fault locating in compensated distribution networks
Pandakov, Konstantin; Hoidalen, Hans Kristian; Marvik, Jorun Irene (Journal article; Peer reviewed, 2017)Earth fault detection and location are very important issues in distribution networks. Current methods for faulty feeder selection are based on measurements of steady-state or transient signals. The work presented here ... -
Polarity crossover regions of transient earth fault relays in non-radial resonant grounded networks
Treider, Thomas; Hoidalen, Hans Kristian (Peer reviewed; Journal article, 2023)Transient-based earth fault protection is widely used in all types of resonant grounded networks, and though the operating principles of the commonly available relays are usually derived from radial networks, manufacturers ... -
Practical Experience in Using a Topological Model of a Core-Type Three-Phase Transformer - No-Load and Inrush conditions
Zirka, Sergey E; Moroz, Yuriy I; Hoidalen, Hans Kristian; Chiesa, Nicola; Lotfi, Abbas; Arturi, CM (Journal article; Peer reviewed, 2017)This paper describes an experience in transformer modeling based on open-circuit test data obtained for a wide range of terminal voltages on the low-voltage side and inrush current measurements on the high-voltage side ... -
Real time hardware-in-the-loop comparison of frequency estimation techniques in application to ROCOF based islanding detection
Grebla, Maciej; Yellajosula, Jaya; Hoidalen, Hans Kristian (Journal article; Peer reviewed, 2018)Rate of change of frequency (ROCOF) is one of the most common islanding detection techniques because of its simplicity and economical benefits. However, it does need thorough considerations to avoid mis-operations of ROCOF ... -
Simplified models of three-phase, five-limb transformer for studying GIC effects
Zirka, S.E.; Moroz, Y.I.; Elovaara, J; Lahtinen, M; Walling, RA; Hoidalen, Hans Kristian; Bonmann, D; Arturi, CM; Chiesa, Nicola (Journal article; Peer reviewed, 2018)The paper describes capabilities of a topological model of three-phase, five-limb transformer to accurately represent its response when subjected to geomagnetically induced currents. The model is validated by close agreement ... -
Study on locating transformer internal faults using sweep frequency response analysis
Khanali, Mahdi; Soloot, Amir Hayati; Hoidalen, Hans Kristian; Jayaram, Shesha (Journal article; Peer reviewed, 2017)As an extensive network of resistances, capacitances, and inductances, a transformer has inherent characteristic parameters that are functions of frequency. The form of these functions is predicated on the geometric design ...