On-line estimation of thevenin equivalent with varying system states

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

doi:10.1109/pes.2008.4596364

Cited by 28 publications

(14 citation statements)

References 5 publications

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“…In interconnected pow modeled and represented as a T seen from each bus [33][34][35]. F equivalent circuit representatio each transmission line ending t replacing each end of the lin circuit [36].…”

Section: Conventional Thevementioning

confidence: 99%

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On-line overcurrent relays setting approach in distribution networks by implementing new adaptive protection algorithm

Zin

Shariati

2015

2015 IEEE Tenth International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP)

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On-Line overcurrent relays setting approach in distribution networks by implementing new adaptive protection algorithmAbstract-In order to meet the ever increasing demand for power, the government has revised its targets in increasing power generation. For this purpose, installation of new equipment or utilization of Distributed Generation (DG) has been employed. In addition to changes in topology of power grid, the amplitude of the short circuit currents also can be affected due to these developments. In this condition, fixed setting for the protective relays cannot respond correctly. In order to prevent any miscoordination or mal-operation, relays have to be adaptively coordinated for a new system configuration to achieve correct fault clearance operation. In this paper, a reliable protection scheme is achieved by implementing the proposed adaptive protection algorithm. As results show, proposed new settings for the relays avoid the risk of unnecessary blackout for distribution network consumers. In addition, sensitive and reliable protection scheme is achieved by implementing the proposed adaptive algorithm.1 978-1-4799-8055-0/15/$31.00 ©2015 IEEE

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Section: Conventional Thevementioning

confidence: 99%

“…It is similar to ne with a Thevenin equivalent roposed method in [36] is an estimating the parameters of introduced in [35]. In this equivalent impedances.…”

Section: Conventional Thevementioning

confidence: 99%

On-line overcurrent relays setting approach in distribution networks by implementing new adaptive protection algorithm

Zin

Shariati

2015

2015 IEEE Tenth International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP)

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“…With considering the reduced model using Thevenin equivalent, the whole complicated system can be simplified to a single-machine-infinite-bus system, and significantly reduces the difficulties of stability analysis. A method has been proposed to estimate Thevenin equivalent with varying system states [6].…”

Section: Characteristicmentioning

confidence: 99%

Fault locating estimation using thevenin equivalent in power systems

Chuang

Tsai²,

Chu

2010

2010 Conference Proceedings IPEC

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This paper develops a method to acquire the relationships between the real fault distance and the varying Thevenin equivalent impedance. Multiple measurements have been taken from simulations of the Taiwan power system and their Thevenin equivalent have been calculated. Thevenin impedance and curve fitting techniques are applied to estimate the fault location. Simulation results show remarkable performances on locating the fault of load shedding and loss of generation, but show unremarkable performances on the fault of short circuit. Simulations in this paper are carried out in PSS/E and MATLAB using the model of Taiwan power system of July 2006.

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“…In [14], three consecutive phasor measurements of generator voltage and current is used to correct the phase drift and TE estimation. In [15][16], recursive least square estimation technique is used to estimate the online for tracking the voltage stability from a load terminal. In [17] authors proposes a new method based on the rate of the change of frequency obtained from PMU measurement in order to correct the phase drift and calculate the TE.…”

Section: Introductionmentioning

confidence: 99%

Power System Thévenin Equivalent Estimation Based on Phasor Measurements

Osbouei

Karegar

2017

Scientia Iranica

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This paper presents a novel algorithm based on phasor measurements to online estimation of power system Thévenin Equivalent (TE) from a generator terminal. Three consecutive phasor measurements of generator terminal voltage and current are used to estimate the system TE. In a real network, system frequency deviation from its nominal value will produce some phase drift in consecutive phasors reported by Phasor Measurements Units (PMUs). To correct the phase drift and synchronizing the reported phasors to the same reference, an improved triangulation method is developed. The improved method uses a virtual vector in its structure. Using this vector alleviates the negative impacts of improper data resulting from noise or disturbances which make the simple triangulation method to be useless. The algorithm is tested on standard NE-39 network and is implemented in Shahid Beheshti University (SBU) protection laboratory to verify the results in a practical area. The obtained results show that the new method can efficiently estimate the in online mode in steady-state and transient conditions.

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On-line estimation of thevenin equivalent with varying system states

Cited by 28 publications

References 5 publications

On-line overcurrent relays setting approach in distribution networks by implementing new adaptive protection algorithm

On-line overcurrent relays setting approach in distribution networks by implementing new adaptive protection algorithm

Fault locating estimation using thevenin equivalent in power systems

Power System Thévenin Equivalent Estimation Based on Phasor Measurements

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