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Open-circuit fault diagnosis and maintenance in multi-pulse parallel and series TRU topologies
(Institute of Electrical and Electronics Engineers (IEEE), 2020-02-27)
Article
Open AccessTransformer Rectifier Units (TRUs) are a reliable way for DC generation in several electric applications. These units are formed by multiple three-phase uncontrolled bridge rectifiers connected according to two main ... -
Uprating of transmission lines by means of HTLS conductors for a sustainable growth: challenges, opportunities, and research needs
(2020-12-01)
Article
Restricted access - publisher's policyThis paper provides a comprehensive and critical review and evaluation of the technological state-of-the-art of high-temperature low-sag (HTLS) conductors by analyzing research articles, theses, reports, white papers and ... -
Reduced-order models of squirrel-cage induction generators for fixed-speed wind turbines under unbalanced grid conditions
(2016-06)
Article
Open AccessThis paper develops a study of reduced-order models for squirrel-cage induction generators used in the fixed-speed wind turbines. The squirrel-cage of these generators must be modeled with a double-cage for accuracy purposes. ... -
Doubly fed induction generator-based variable-speed wind turbine: proposal of a simplified model under a faulty grid with short-duration faults
(2019-08)
Article
Open AccessThe aim of this study is to provide a simplified model of a variable-speed wind turbine (VSWT) with the technology of a doubly-fed induction generator (DFIG) which operates under faulty grid conditions. A simplified model ... -
Initialization of DFIG wind turbines with a phasor-based approach
(2019-03)
Article
Open AccessThe objective of this paper is to propose a simple approach to solve the steady state of a wind turbine (WT) equipped with a doubly-fed induction generator (DFIG) which can be used to initialize dynamic studies of the ... -
Experimental study of the corona performance of aged sand-cast substation connectors
(2020-06-01)
Article
Open AccessSubstation connectors, like many other high-voltage products, are tested once manufactured. However, the corona behavior of aged specimens can differ from that exhibited by newer ones, thus generating detrimental technical ... -
Voltage sag influence on controlled three-phase grid-connected inverters according to the Spanish grid code
(2020-02-03)
Article
Open AccessTo ensure the safe operation of the grid, there are some requirements to be taken into consideration to connect power converters. During abnormal conditions – e.g. during voltage sags –, the control of the converters is a ... -
Arc tracking control in insulation systems for aeronautic applications: challenges, opportunities, and research needs
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-16)
Article
Open AccessNext generation aircrafts will use more electrical power to reduce weight, fuel consumption, system complexity and greenhouse gas emissions. However, new failure modes and challenges arise related to the required voltage ... -
An improved harmonic load flow formulation
(Taylor & Francis, 2019-10-21)
Article
Restricted access - publisher's policyThe paper contributes an improved harmonic load flow formulation with fewer convergence problems but the same accurate results as traditional formulations. The proposed formulation approaches the harmonic load flow problem ... -
Assessment of subsynchronous oscillations in AC grid-connected VSC systems with type-4 wind turbines
(2019-12-09)
Article
Open AccessConverters are the key for increasing the development of renewable energy generation but their dynamic interaction with the grid has an important impact on stability. Oscillatory instabilities in different grid-connected ... -
Admittance study of grid-connected VSCs for harmonic oscillatory instabilities
(2019-09-17)
Article
Open AccessVoltage source converters (VSCs) can reduce damping of grid-connected VSC systems at harmonic resonances, leading to system instability. The conductance of the VSC admittance can be shaped selecting appropriate VSC parameter ... -
Advanced quiz development for students’ self-learning in power generation, transmission and distribution
(SAGE PUBLICATIONS INC, 2019)
Article
Open AccessStudents’ learning can be improved by using online quizzes with a valuable feedback, especially in large groups, making it very interesting for engineering subjects which are based on mathematics. This paper presents the ...
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