The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform
Babak Badrzadeh - One of the best experts on this subject based on the ideXlab platform.
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General methodology for analysis of sub-Synchronous Interaction in wind power plants
2013 IEEE Power & Energy Society General Meeting, 2013Co-Authors: Babak Badrzadeh, Mandhir Sahni, Dharshana Muthumuni, Yi Zhou, Anand GoleAbstract:Summary form only given. This paper presents a general methodology for analysis of sub-Synchronous Interaction in wind power plants. These include appropriate frequency scanning method for the assessment of the sub-Synchronous control Interaction, and calculation of the electrical damping provided by the wind turbine generator for investigation of the sub-Synchronous torsional Interaction. A general formulation of both methods applicable to any given wind turbine and network is presented. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine non-linearities and its active behavior. Various aspects that need to be considered when injecting a voltage or current signal into the system for dynamic frequency scanning are discussed in detail. The veracity of these methods is confirmed against electromagnetic transient analyses. The application of these tools and techniques is demonstrated on a practical power system comprising type 3 wind turbines and series compensated lines.
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General Methodology for Analysis of Sub-Synchronous Interaction in Wind Power Plants
IEEE Transactions on Power Systems, 2013Co-Authors: Babak Badrzadeh, Mandhir Sahni, Dharshana Muthumuni, Yi Zhou, Anand GoleAbstract:This paper presents a general methodology for analysis of sub-Synchronous Interaction in wind power plants. These include appropriate frequency scanning method for the assessment of the sub-Synchronous control Interaction, and calculation of the electrical damping provided by the wind turbine generator for investigation of the sub-Synchronous torsional Interaction. A general formulation of both methods applicable to any given wind turbine and network is presented. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine nonlinearities and its active behavior. Various aspects that need to be considered when injecting a voltage or current signal into the system for dynamic frequency scanning are discussed in detail. The veracity of these methods is confirmed against electromagnetic transient analyses. The application of these tools and techniques is demonstrated on a practical power system comprising type 3 wind turbines and series compensated lines.
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Sub-Synchronous Interaction in Wind Power Plants- part II: An ercot case study
2012 IEEE Power and Energy Society General Meeting, 2012Co-Authors: Mandhir Sahni, Babak Badrzadeh, Dharshana Muthumuni, Y Cheng, S. H. HuangAbstract:This is the second part of a two-paper series. The first paper presented the tools and techniques for investigation of sub-Synchronous control and torsional Interaction in Wind Power Plants (WPPs). This paper presents a comprehensive Electro-Magnetic Transient (EMT) simulation based case study to investigate potential Sub-Synchronous Control Interaction (SSCI) issues. The Electric Reliability Council of Texas (ERCOT) transmission grid model is utilized for the case study. Implementation of the system and turbine side scans on the ERCOT grid model has been performed to identify conditions requiring further investigation. Detailed EMT simulations using specific turbine manufacturer models have been performed as part of further investigations. Scenarios around key aspects of the system and turbine model performance have been developed and investigated.
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sub Synchronous Interaction in wind power plants part i study tools and techniques
Power and Energy Society General Meeting, 2012Co-Authors: Babak Badrzadeh, Yi ZhouAbstract:This is the first part of a two-paper series which investigates different modeling and simulation tools and techniques appropriate for the analysis of sub-Synchronous control and torsional Interaction in wind power plants. A critical review of the commonly used techniques is presented which allows identifying the three suitable candidates. These methods include frequency scanning method, the test signal method for the calculation of electrical damping provided by the wind turbine generator, and electromagnetic transient analysis which confirms the veracity of the first two methods. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine non-linearities and its active behavior. It is shown that these three tools allow capturing all the information pertinent to sub-Synchronous Interaction phenomena. The application of these tools and techniques on a practical power system comprising type 3 wind turbines and series compensated lines is demonstrated. Results obtained from these three methodologies are consistent and complimentary.
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Susceptibility of wind turbines to sub-Synchronous control and torsional Interaction
PES T&D 2012, 2012Co-Authors: Babak Badrzadeh, Steve SaylorsAbstract:This paper investigates the risk of sub-Synchronous Interaction in wind power plants. Time-domain PSCAD/EMTDC simulation case studies are conducted for the most pessimistic operating condition where the wind power plant becomes radially connected to a weak ac system through a series compensated ac line. Wind turbines of type 1-4 designs are investigated from a sub-Synchronous control Interaction standpoint. Two different variations of type 3 turbines are considered. Further the susceptibility of type 3 turbine with regard to sub-Synchronous torsional Interaction is discussed. The outcome of these case studies helps identifying the turbine types which are immune to sub-Synchronous Interaction problems, and those which could, under some circumstances, be susceptible to sub-Synchronous Interaction issues.
Arthur I Eidelman - One of the best experts on this subject based on the ideXlab platform.
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maternal postpartum behavior and the emergence of infant mother and infant father synchrony in preterm and full term infants the role of neonatal vagal tone
Developmental Psychobiology, 2007Co-Authors: Ruth Feldman, Arthur I EidelmanAbstract:Relations between maternal postpartum behavior and the emergence of parent-infant relatedness as a function of infant autonomic maturity were examined in 56 premature infants (birthweight = 1000-1500 g) and 52 full-term infants. Maternal behavior, mother depressive symptoms, and infant cardiac vagal tone were assessed in the neonatal period. Infant-mother and infant-father synchrony, maternal and paternal affectionate touch, and the home environment were observed at 3 months. Premature birth was associated with higher maternal depression, less maternal behaviors, decreased infant alertness, and lower coordination of maternal behavior with infant alertness in the neonatal period. At 3 months, Interactions between premature infants with their mothers and fathers were less Synchronous. Interaction effects of premature birth and autonomic maturity indicated that preterm infants with low vagal tone received the lowest amounts of maternal behavior in the postpartum and the least maternal touch at 3 months. Infant-mother and infant-father synchrony were each predicted by cardiac vagal tone and maternal postpartum behavior in both the preterm and full-term groups. Among preterm infants, additional predictors of parent-infant synchrony were maternal depression (mother only) and the home environment (mother and father). Findings are consistent with evolutionary perspectives on the higher susceptibility of dysregulated infants to rearing contexts and underscore the compensatory mechanisms required for social-emotional growth under risk conditions for parent-infant bonding.
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maternal postpartum behavior and the emergence of infant mother and infant father synchrony in preterm and full term infants the role of neonatal vagal tone
Developmental Psychobiology, 2007Co-Authors: Ruth Feldman, Arthur I EidelmanAbstract:Relations between maternal postpartum behavior and the emergence of parent-infant relatedness as a function of infant autonomic maturity were examined in 56 premature infants (birthweight = 1000–1500 g) and 52 full-term infants. Maternal behavior, mother depressive symptoms, and infant cardiac vagal tone were assessed in the neonatal period. Infant–mother and infant–father synchrony, maternal and paternal affectionate touch, and the home environment were observed at 3 months. Premature birth was associated with higher maternal depression, less maternal behaviors, decreased infant alertness, and lower coordination of maternal behavior with infant alertness in the neonatal period. At 3 months, Interactions between premature infants with their mothers and fathers were less Synchronous. Interaction effects of premature birth and autonomic maturity indicated that preterm infants with low vagal tone received the lowest amounts of maternal behavior in the postpartum and the least maternal touch at 3 months. Infant–mother and infant–father synchrony were each predicted by cardiac vagal tone and maternal postpartum behavior in both the preterm and full-term groups. Among preterm infants, additional predictors of parent–infant synchrony were maternal depression (mother only) and the home environment (mother and father). Findings are consistent with evolutionary perspectives on the higher susceptibility of dysregulated infants to rearing contexts and underscore the compensatory mechanisms required for social-emotional growth under risk conditions for parent–infant bonding. © 2007 Wiley Periodicals, Inc. Dev Psychobiol 49: 290–302, 2007.
Elda Miramontes - One of the best experts on this subject based on the ideXlab platform.
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contourite and mixed turbidite contourite systems in the mozambique channel sw indian ocean link between geometry sediment characteristics and modelled bottom currents
Marine Geology, 2021Co-Authors: Elda Miramontes, Antoine Thieblemont, Nathalie Babonneau, Pierrick Penven, Francois Raisson, Laurence Droz, Stephan J Jorry, Ruth Fierens, John W Counts, Henriette WilckensAbstract:Abstract Oceanic currents can profoundly reshape the seafloor and even modify the characteristics of turbidite systems. Multiple erosional and depositional features directly formed by bottom currents (i.e. contourites), as well as by the Interaction between bottom currents and turbidity currents or turbidite systems (i.e. mixed turbidite-contourite systems) have been identified in the Mozambique Channel (SW Indian Ocean) in multibeam bathymetry, seismic reflection data, sub-bottom profiler images and sediment cores. In this study, we characterise the morphology, stacking pattern and sedimentary characteristics of these sedimentary systems, and analysed the properties of bottom currents at these systems using a hydrodynamic numerical model. Modelled bottom currents are the highest at abraded surfaces and moats, but they also display a relatively high variability, suggesting that the observed erosion is not the result of a constant or persistent current but rather of episodes of intense circulation. Modelled bottom currents at contourite terraces are not significantly different from currents at related plastered drifts, where accumulation is enhanced. The formation of contourite terraces can thus not solely be explained by the mean oceanic circulation and eddies, implying that other processes such as internal waves may play a relevant role in their formation. Three different types of mixed turbidite-contourite systems were observed: one characterised by asymmetric channel-levee systems formed by the Synchronous Interaction of bottom currents and turbidity currents, one characterised by a phased Interaction that resulted in the erosion of the channel flanks by bottom currents, and another one in which both Synchronous and phased Interaction played a relevant role in the evolution of the system. Finally, we propose a simplified classification of contourites that can be applied to any contourite system worldwide, and that comprises erosional and depositional features, including muddy and sandy contourite deposits.
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channel levee evolution in combined contour current turbidity current flows from flume tank experiments
Geology, 2020Co-Authors: Elda Miramontes, Joris T Eggenhuisen, Ricardo Silva Jacinto, Giovanni Poneti, Florian Pohl, Alexandre Normandeau, Calvin D Campbell, Javier F HernandezmolinaAbstract:Turbidity currents and contour currents are common sedimentary and oceanographic processes in deep-marine settings that affect continental margins worldwide. Their simultaneous Interaction can form asymmetric and unidirectionally migrating channels, which can lead to opposite interpretations of paleocontour current direction: channels migrating against the contour current or in the direction of the contour current. In this study, we performed three-dimensional flume-tank experiments of the Synchronous Interaction between contour currents and turbidity currents to understand the effect of these combined currents on channel architecture and evolution. Our results show that contour currents with a velocity of 10–19 cm s−1 can substantially deflect the direction of turbidity currents with a maximum velocity of 76–96 cm s−1 , and modify the channel-levee system architecture. A lateral and nearly stationary front formed on the levee located upstream of the contour current, reduced overspill and thus restrained the development of a levee on this side of the channel. Sediment was preferentially carried out of the channel at the flank located downstream of the contour current. An increase in contour-current velocity resulted in an increase in channel-levee asymmetry, with the development of a wider levee and more abundant bedforms downstream of the contour current. This asymmetric deposition along the channel suggests that the direction of long-term migration of the channel form should go against the direction of the contour current due to levee growth downstream of the contour current, in agreement with one of the previously proposed conceptual models.
Anand Gole - One of the best experts on this subject based on the ideXlab platform.
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General methodology for analysis of sub-Synchronous Interaction in wind power plants
2013 IEEE Power & Energy Society General Meeting, 2013Co-Authors: Babak Badrzadeh, Mandhir Sahni, Dharshana Muthumuni, Yi Zhou, Anand GoleAbstract:Summary form only given. This paper presents a general methodology for analysis of sub-Synchronous Interaction in wind power plants. These include appropriate frequency scanning method for the assessment of the sub-Synchronous control Interaction, and calculation of the electrical damping provided by the wind turbine generator for investigation of the sub-Synchronous torsional Interaction. A general formulation of both methods applicable to any given wind turbine and network is presented. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine non-linearities and its active behavior. Various aspects that need to be considered when injecting a voltage or current signal into the system for dynamic frequency scanning are discussed in detail. The veracity of these methods is confirmed against electromagnetic transient analyses. The application of these tools and techniques is demonstrated on a practical power system comprising type 3 wind turbines and series compensated lines.
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General Methodology for Analysis of Sub-Synchronous Interaction in Wind Power Plants
IEEE Transactions on Power Systems, 2013Co-Authors: Babak Badrzadeh, Mandhir Sahni, Dharshana Muthumuni, Yi Zhou, Anand GoleAbstract:This paper presents a general methodology for analysis of sub-Synchronous Interaction in wind power plants. These include appropriate frequency scanning method for the assessment of the sub-Synchronous control Interaction, and calculation of the electrical damping provided by the wind turbine generator for investigation of the sub-Synchronous torsional Interaction. A general formulation of both methods applicable to any given wind turbine and network is presented. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine nonlinearities and its active behavior. Various aspects that need to be considered when injecting a voltage or current signal into the system for dynamic frequency scanning are discussed in detail. The veracity of these methods is confirmed against electromagnetic transient analyses. The application of these tools and techniques is demonstrated on a practical power system comprising type 3 wind turbines and series compensated lines.
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Advanced screening techniques for Sub-Synchronous Interaction in wind farms
PES T&D 2012, 2012Co-Authors: Mandhir Sahni, Babak Badrzadeh, Dharshana Muthumuni, Anand Gole, A KulkarniAbstract:This paper aims to outline comprehensive screening guidelines associated with the Sub Synchronous Control Interaction (SSCI) and Sub Synchronous Torsional Interaction (SSTI) for wind power plants. Specific guidelines and methodologies to identify the critical system conditions to be assessed for screening analysis are presented. The application of these techniques on a portion ERCOT grid model with series compensated lines has been demonstrated. Current injection based frequency scans on the system and turbine side are utilized. Based on these scans a guideline to identify the specific candidates for further investigation using Electro Magnetic Transient (EMT)-type simulation is proposed. The results of the screening study are further corroborated by the EMT based simulation case studies. An electrical damping analysis based screening technique for the analysis of SSTI has been presented. The SSTI screening studies have been further corroborated by means of EMT simulations.
Ruth Feldman - One of the best experts on this subject based on the ideXlab platform.
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maternal postpartum behavior and the emergence of infant mother and infant father synchrony in preterm and full term infants the role of neonatal vagal tone
Developmental Psychobiology, 2007Co-Authors: Ruth Feldman, Arthur I EidelmanAbstract:Relations between maternal postpartum behavior and the emergence of parent-infant relatedness as a function of infant autonomic maturity were examined in 56 premature infants (birthweight = 1000-1500 g) and 52 full-term infants. Maternal behavior, mother depressive symptoms, and infant cardiac vagal tone were assessed in the neonatal period. Infant-mother and infant-father synchrony, maternal and paternal affectionate touch, and the home environment were observed at 3 months. Premature birth was associated with higher maternal depression, less maternal behaviors, decreased infant alertness, and lower coordination of maternal behavior with infant alertness in the neonatal period. At 3 months, Interactions between premature infants with their mothers and fathers were less Synchronous. Interaction effects of premature birth and autonomic maturity indicated that preterm infants with low vagal tone received the lowest amounts of maternal behavior in the postpartum and the least maternal touch at 3 months. Infant-mother and infant-father synchrony were each predicted by cardiac vagal tone and maternal postpartum behavior in both the preterm and full-term groups. Among preterm infants, additional predictors of parent-infant synchrony were maternal depression (mother only) and the home environment (mother and father). Findings are consistent with evolutionary perspectives on the higher susceptibility of dysregulated infants to rearing contexts and underscore the compensatory mechanisms required for social-emotional growth under risk conditions for parent-infant bonding.
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maternal postpartum behavior and the emergence of infant mother and infant father synchrony in preterm and full term infants the role of neonatal vagal tone
Developmental Psychobiology, 2007Co-Authors: Ruth Feldman, Arthur I EidelmanAbstract:Relations between maternal postpartum behavior and the emergence of parent-infant relatedness as a function of infant autonomic maturity were examined in 56 premature infants (birthweight = 1000–1500 g) and 52 full-term infants. Maternal behavior, mother depressive symptoms, and infant cardiac vagal tone were assessed in the neonatal period. Infant–mother and infant–father synchrony, maternal and paternal affectionate touch, and the home environment were observed at 3 months. Premature birth was associated with higher maternal depression, less maternal behaviors, decreased infant alertness, and lower coordination of maternal behavior with infant alertness in the neonatal period. At 3 months, Interactions between premature infants with their mothers and fathers were less Synchronous. Interaction effects of premature birth and autonomic maturity indicated that preterm infants with low vagal tone received the lowest amounts of maternal behavior in the postpartum and the least maternal touch at 3 months. Infant–mother and infant–father synchrony were each predicted by cardiac vagal tone and maternal postpartum behavior in both the preterm and full-term groups. Among preterm infants, additional predictors of parent–infant synchrony were maternal depression (mother only) and the home environment (mother and father). Findings are consistent with evolutionary perspectives on the higher susceptibility of dysregulated infants to rearing contexts and underscore the compensatory mechanisms required for social-emotional growth under risk conditions for parent–infant bonding. © 2007 Wiley Periodicals, Inc. Dev Psychobiol 49: 290–302, 2007.
