The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
John D Morrow - One of the best experts on this subject based on the ideXlab platform.
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online Thevenin Equivalent determination using graphical phasor manipulation
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: S Abdelkader, Abdelfattah A Eladl, Mohammed Saeed, John D MorrowAbstract:Abstract This paper presents a new method for determining the Thevenin Equivalent parameters of a power system at a node. A graphical method for deriving Thevenin Equivalent parameters using online PMU measurements is developed based on representing and manipulating the measured voltage phasors in the complex voltage plane. The proposed method has the ability to use a large numbers of measurements for individual calculation thus providing greater tolerance of bad and erroneous measurements. The method is both computationally efficient and displays improved performance over similar methods when implemented using actual PMU data.
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online Thevenin Equivalent determination considering system side changes and measurement errors
IEEE Transactions on Power Systems, 2015Co-Authors: S Abdelkader, John D MorrowAbstract:This paper presents a new method for online determination of the Thevenin Equivalent parameters of a power system at a given node using the local PMU measurements at that node. The method takes into account the measurement errors and the changes in the system side. An analysis of the effects of changes in system side is carried out on a simple two-bus system to gain an insight of the effect of system side changes on the estimated Thevenin Equivalent parameters. The proposed method uses voltage and current magnitudes as well as active and reactive powers; thus avoiding the effect of phase angle drift of the PMU and the need to synchronize measurements at different instances to the same reference. Applying the method to the IEEE 30-bus test system has shown its ability to correctly determine the Thevenin Equivalent even in the presence of measurement errors and/or system side changes.
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closure to discussion on online tracking of Thevenin Equivalent parameters using pmu measurements
IEEE Transactions on Power Systems, 2013Co-Authors: S Abdelkader, John D MorrowAbstract:This article discusses the closure to discussion on "online tracking of Thevenin Equivalent parameters using PMU measurements".
Navin Bhatt - One of the best experts on this subject based on the ideXlab platform.
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Measurement-Based Real-Time Voltage Stability Monitoring for Load Areas
IEEE Transactions on Power Systems, 2016Co-Authors: Fengkai Hu, Alberto Del Rosso, Evangelos Farantatos, Navin BhattAbstract:This paper proposes a measurement-based voltage stability monitoring method for a load area fed by N tie lines. Compared to a traditional Thevenin Equivalent based method, the new method adopts an N +1 buses Equivalent system so as to model and monitor individual tie lines. For each tie line, the method solves the power transfer limit against voltage instability analytically as a function of all parameters of that Equivalent, which are online identified from real-time synchronized measurements on boundary buses of the load area. Thus, this new method can directly calculate the real-time power transfer limit on each tie line. The method is first compared with a Thevenin Equivalent based method using a 4-bus test system and then demonstrated by case studies on the Northeast Power Coordinating Council (NPCC) 48-machine, 140-bus power system.
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An adaptive three-bus power system Equivalent for estimating voltage stability margin from synchronized phasor measurements
2014 IEEE PES General Meeting | Conference & Exposition, 2014Co-Authors: Fengkai Hu, Alberto Del Rosso, Evangelos Farantatos, Navin BhattAbstract:This paper utilizes an adaptive three-bus power system Equivalent for measurement-based voltage stability analysis. With that Equivalent identified online, a measurement-based approach is developed to estimate real-time voltage stability margin for a load-rich area supported by remote generation via multiple tie lines. Compared with traditional Thevenin Equivalent based approach, this new approach is able to provide more accurate voltage stability margin for each individual tie line. This approach is validated on a three-bus system and the IEEE 39-bus system.
S Abdelkader - One of the best experts on this subject based on the ideXlab platform.
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online Thevenin Equivalent determination using graphical phasor manipulation
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: S Abdelkader, Abdelfattah A Eladl, Mohammed Saeed, John D MorrowAbstract:Abstract This paper presents a new method for determining the Thevenin Equivalent parameters of a power system at a node. A graphical method for deriving Thevenin Equivalent parameters using online PMU measurements is developed based on representing and manipulating the measured voltage phasors in the complex voltage plane. The proposed method has the ability to use a large numbers of measurements for individual calculation thus providing greater tolerance of bad and erroneous measurements. The method is both computationally efficient and displays improved performance over similar methods when implemented using actual PMU data.
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online Thevenin Equivalent determination considering system side changes and measurement errors
IEEE Transactions on Power Systems, 2015Co-Authors: S Abdelkader, John D MorrowAbstract:This paper presents a new method for online determination of the Thevenin Equivalent parameters of a power system at a given node using the local PMU measurements at that node. The method takes into account the measurement errors and the changes in the system side. An analysis of the effects of changes in system side is carried out on a simple two-bus system to gain an insight of the effect of system side changes on the estimated Thevenin Equivalent parameters. The proposed method uses voltage and current magnitudes as well as active and reactive powers; thus avoiding the effect of phase angle drift of the PMU and the need to synchronize measurements at different instances to the same reference. Applying the method to the IEEE 30-bus test system has shown its ability to correctly determine the Thevenin Equivalent even in the presence of measurement errors and/or system side changes.
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closure to discussion on online tracking of Thevenin Equivalent parameters using pmu measurements
IEEE Transactions on Power Systems, 2013Co-Authors: S Abdelkader, John D MorrowAbstract:This article discusses the closure to discussion on "online tracking of Thevenin Equivalent parameters using PMU measurements".
Tiankui Sun - One of the best experts on this subject based on the ideXlab platform.
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a second order indice for estimating voltage stability margin based on analytic Thevenin Equivalent
2019 IEEE International Conference on Energy Internet (ICEI), 2019Co-Authors: Tiankui Sun, Haitao LiuAbstract:In estimating the long term voltage stability of power system, the linearity and accuracy of indice is important. In this paper, a second order indice based on analytic Thevenin Equivalent (TE) is proposed for estimating static voltage stability margin. Its analytic expression only using single instant wide area measurements, which make it not be affected by the system inside power change. As a second order indice, its linearity performance well. Compared to conventional voltage stability indice (VSI), such as impedance modulus, the proposed indice has better linearity feature, which can support operators to estimate the remaining power effectively. The performance of proposed VSI is verified on both IEEE 118-bus system and Alberta 2016-bus system.
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an analytic method to calculate Thevenin Equivalent parameters using single time wide area pmu measurements
IEEE Conference Energy Internet and Energy System Integration, 2018Co-Authors: Tiankui Sun, Jiankun Liu, Shuang Song, Yi YangAbstract:This paper presents an analytic method calculating Thevenin Equivalent (TE) parameters with single-time measurements. TE model of power systems is used in static voltage stability estimation. However, identification of TE parameters faces with accuracy issue currently. In this paper, we derives analytic expression of Thevenin Equivalent parameters using single-time wide area measurements. It can avoid the accuracy issue caused by system disturbance. The simulation results on New England 39-bus system proves the effectiveness and accuracy of proposed method.
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effect of load change on the Thevenin Equivalent impedance of power system
Energies, 2017Co-Authors: Tiankui Sun, Shuang RongAbstract:This paper discusses the effect of load change on the Thevenin Equivalent impedance of power systems. In this paper, the Thevenin Equivalent impedance influenced by the derivative of active load with respect to reactive load (dP dQ) is analyzed. The Thevenin Equivalent impedance forms a closed curve in a complex plane and shrinks to one point when voltage collapses. The magnitude of the Thevenin Equivalent impedance at the collapse point is equal to the magnitude of the load impedance. Therefore, the impedance match theory still holds under the effect of the load change. These features are verified on a New England 39-bus system.
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a preliminary study on the Thevenin Equivalent parameters of dfig wind farms
Power and Energy Society General Meeting, 2016Co-Authors: Tiankui SunAbstract:It is an important but challenging issue to represent a wind farm using an Equivalent model. This paper tries to develop an Equivalent representation of a wind farm for power system planning and operation studies using Thevenin Equivalent circuit. In the paper, a series string configuration of wind farms with doubly-fed induction generator (DFIG) wind turbines is emphasized, and case studies have been conducted to investigate the characteristics of the Equivalent parameters of such a wind farm under different control strategies and wind speeds. Simulation results show that the Equivalent parameters are strongly related to the wind speed, particularly when the constant power factor control strategy is employed for wind turbines. It can also be concluded that, compared to the constant power factor case, the constant voltage control scheme possesses better performance and thus is more popular for power system operation and control.
Jussi Suomela - One of the best experts on this subject based on the ideXlab platform.
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time domain parameter extraction method for Thevenin Equivalent circuit battery models
IEEE Transactions on Energy Conversion, 2014Co-Authors: Ari Hentunen, Teemu Lehmuspelto, Jussi SuomelaAbstract:This paper presents an analytical time-domain-based parameter identification method for Thevenin-Equivalent circuit-based lithium-ion battery models. The method is based on the analysis of voltage-relaxation characteristics of pulse discharge and pulse charge experiments, and the method can be used for both discharge and charge operation with any number of parallel resistor-capacitor branches. The use of the method is demonstrated for a second-order model and validated with a real-world duty cycle. Experimental results for a commercial lithium-ion battery module are presented.
