Browsing Institutt for elkraftteknikk by Journals "Electric power systems research"
Now showing items 1-20 of 21
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A Virtual synchronous machine implementation for distributed control of power transformers in SmartGrids
(Peer reviewed; Journal article, 2015)The ongoing evolution of the power system towards a “SmartGrid” implies a dominant role of powerelectronic converters, but poses strict requirements on their control strategies to preserve stability andcontrollability. In ... -
An overview on formulations and optimization methods for the unit-based short-term hydro scheduling problem
(Journal article; Peer reviewed, 2019)The short-term hydro scheduling (STHS) problem aims at determining the optimal power generation schedules for either a single hydropower plant or an integrated system of cascaded watercourses during a time horizon from a ... -
Analysis of gray Box Modelling of Transformers
(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 ... -
Analytical approach for adequacy assessment of cyber–physical multi-microgrid distribution systems with distributed generation
(Peer reviewed; Journal article, 2022)In recent years, there has been a marked increase in the deployment of information and communication technologies (ICTs) in power systems. ICTs impart a cyber-physical nature to power systems, and though they improve the ... -
Assessing the benefits of exchanging spinning reserve capacity within the hydro-Dominated nordic market
(Peer reviewed; Journal article, 2021)This paper presents a hydrothermal scheduling toolchain suitable for detailed studies of procurement of spinning reserves in the hydro-dominated Nordic power system. The toolchain combines a long-term model to find the ... -
BATTPOWER application: Large-scale integration of EVs in an active distribution grid – A Norwegian case study
(Journal article, 2022)With the considerable increase of Distributed Energy Resources (DER), reliable and cost-effective operation of distribution grids becomes challenging. The efficient operation relies on computationally dependable and tractable ... -
Closest security boundary for improving oscillation damping through generation redispatch using eigenvalue sensitivities
(Journal article; Peer reviewed, 2018)This paper proposes an algorithm for determining a minimum generation redispatch capable of moving specific oscillation modes to the closest small-signal security boundary that guarantees them a desired damping factor. The ... -
The consequence of ignoring load modeling on the circuit breaker selection in densely-meshed sub-transmission systems
(Journal article; Peer reviewed, 2024)In this paper, the selection of circuit breakers for a densely-meshed sub-transmission system with relatively short transmission lines is investigated. The results highlight the significance of modeling the load at the end ... -
Distributed Selective Harmonic Mitigation and Decoupled Unbalance Compensation by Coordinated Inverters in Three-Phase Four-Wire Low-Voltage Networks
(Peer reviewed; Journal article, 2020)Considering the high penetration of distributed generators in low-voltage grids, establishing a coordinated operation of their grid-tied inverters has become imperative to move towards the implementation of smart grids.Yet, ... -
Efficient multi-year security constrained ac transmission network expansion planning
(Peer reviewed; Journal article, 2020)Solution of multi-year, dynamic AC Transmission Network Expansion Planning (TNEP) problem is gradually taking centre stage of planning research owing to its potential accuracy. However, computational burden for a security ... -
Estimating distance to transient and restriking earth faults in high-impedance grounded, ring-operated distribution networks using current ratios
(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 ... -
Evaluating demand side measures in simulation models for the power market
(Journal article; Peer reviewed, 2011)Increased energy efficiency is one of the pillars for reducing CO2 emissions. However, in models for the electricity market like unit commitment and dispatch models, increased efficiency of demand results in a paradoxical ... -
Hydrothermal scheduling in the continuous-time framework
(Peer reviewed; Journal article, 2020)Continuous-time optimization models have successfully been used to capture the impact of ramping limitations in power systems. In this paper, the continuous-time framework is adapted to model flexible hydropower resources ... -
Influence of voltage harmonics on transformer no-load loss measurements and calculation of magnetization curves
(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 ... -
Optimized Control of Variable Speed Hydropower for Provision of Fast Frequency Reserves
(Peer reviewed; Journal article, 2020)This paper deals with the design of controllers for variable speed hydropower (VSHP) plants with the objective of optimize the plants performance. The control objectives imply enabling fast responses to frequency deviations ... -
Polarity crossover regions of transient earth fault relays in non-radial resonant grounded networks
(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 ... -
Pricing electricity in constrained networks dominated by stochastic renewable generation and electric energy storage
(Peer reviewed; Journal article, 2021)This paper studies the electricity price formation in a competitive market when introducing generation from variable renewable energy technologies with zero marginal cost and electric energy storage systems. A power system ... -
Stochastic operation of energy constrained microgrids considering battery degradation
(Peer reviewed; Journal article, 2022)Power systems with high penetration of variable renewable generation are vulnerable to periods with low generation. An alternative to retain high dispatchable generation capacity is electric energy storage that enables ... -
Study on locating transformer internal faults using sweep frequency response analysis
(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 ... -
A supervised learning approach for optimal selection of bidding strategies in reservoir hydro
(Peer reviewed; Journal article, 2020)Power producers use a wide range of decision support systems to manage and plan for sales in the day-ahead electricity market. The available tools have advantages and disadvantages and the operators are often faced with ...