Adaptive undervoltage load shedding relay design using Thevenin equivalent estimation

Tsai, S.-J.S.; Wong, Kim-Hoi

doi:10.1109/pes.2008.4596370

Cited by 15 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Again, with the assumption that only one side changes, the third term in the numerator of ( 9) can be omitted and (9) reduces to (10) at the bottom of the page.…”

Section: B Effect Of System Side Changes and Measurement Errorsmentioning

confidence: 99%

“…TE has been, and is being, used for a wide variety of applications including, but not limited to: short circuit current calculation in both distribution [1], [2] and transmission systems [3]; fault location [4], [5]; parameter identification for instability detection [6] and for electromagnetic transient studies [7]; harmonic detection and analysis in distribution systems [8], [9]; under voltage load shedding [10]; online estimation of maximum power transfer limits [11]; and voltage stability monitoring [12]- [20].…”

Section: Introductionmentioning

confidence: 99%

“…For harmonic detection, is determined and compared with the critical impedance [8], while in [9], the harmonic source is characterized by a Norton equivalent determined by making a change in the system side, changing the transformer tap. Least squares estimation [10], [15] and optimization [22] techniques were also used to determine the TE.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Abdelkader

Morrow

2015

IEEE Trans. Power Syst.

View full text Add to dashboard Cite

This paper presents a new method for online determination of the Thèvenin 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 Thévenin 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 Thévenin equivalent even in the presence of measurement errors and/or system side changes.

show abstract

“…Again, with the assumption that only one side changes, the third term in the numerator of ( 9) can be omitted and (9) reduces to (10) at the bottom of the page.…”

Section: B Effect Of System Side Changes and Measurement Errorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Abdelkader

Morrow

2015

IEEE Trans. Power Syst.

View full text Add to dashboard Cite

show abstract

“…are just some of a long list of operation, monitoring and control functions that can be implemented locally if such an accurate equivalent was available online. This may explain the lasting and increasing interest in determining a Thévenin Equivalent (TE) of a power system at a node and the resulting wide variety of methods for TE determination and the applications for which it may be used [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. TE has been used for electromagnetic transients analysis [1], voltage stability assessment [2,4,7,11], harmonic analysis [3], analysis of faulted system [5], designing an adaptive under voltage load shedding [6], constructing node capability chart [8], estimating maximum power transfer limits [10], and developing an adaptive fault location algorithm [14].…”

Section: Introductionmentioning

confidence: 99%

Online Thévenin equivalent determination using graphical phasor manipulation

Abdelkader

Eladl

Saeed

et al. 2018

International Journal of Electrical Power & Energy Systems

View full text Add to dashboard Cite

This paper presents a new method for determining the Thévenin equivalent parameters of a power system at a node. A graphical method for deriving Thévenin 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.

show abstract

“…Detection and estimation of Thevenin equivalent impedance for different application is reported in literature. For example, power system fault detection, load matching for maximum power transfer, state of charge estimation for battery bank [16], simultaneous estimation of Thevenin equivalent of multiple sources, for load management by load shedding in power system network based on detection of undervoltage [17], voltage stability margin adjustment and analysis for prevention of voltage collapse by a real time voltage instability identification algorithm based on local phasor measurements [18].…”

Section: Introductionmentioning

confidence: 99%

Online thevenin equivalent parameter estimation using nonlinear and linear recursive least square algorithm

Hashmi

Choudhary

Priolkar

2015

2015 IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT)

View full text Add to dashboard Cite

Abstract-This paper proposes method for detection, estimation of Thevenin equivalent parameters to describe power system behavior. Thevenin equivalent estimation is a challenge due to variation in system states caused by power flow in the network. Thevenin equivalent calculation based on changes in system with multiple sources integrated with grid, isolated distributed generator system is analysed and nonlinear least square fit estimation technique for algorithm is adopted. Linear least square fit is used with a linearized model. Performance evaluation of proposed method is carried out through mathematical model, nonlinear and linear least square fit based algorithm technique and simulation through MATLAB/SIMULINK package. Accurate grid and source side impedance estimation technique is applicable for distributed generation sources interfaced with grid to improve dynamic response, stability, reliability when subjected to faults or any other disturbances in network. Algorithm can accurately estimate Thevenin equivalent of multiple sources connected in parallel simultaneously with voltage and current phasor measurements at point of common coupling. Mathematical analysis and simulation results validate the effectiveness of proposed method.

show abstract

Adaptive undervoltage load shedding relay design using Thevenin equivalent estimation

Cited by 15 publications

References 8 publications

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Online Thévenin equivalent determination using graphical phasor manipulation

Online thevenin equivalent parameter estimation using nonlinear and linear recursive least square algorithm

Contact Info

Product

Resources

About