Real-Time Measurement of Mean Frequency in Two-Machine System During Power Swings

Xu, Qiong; Jiale, Suonan; Ge, Yongqiang

doi:10.1109/tpwrd.2003.823208

Cited by 21 publications

(22 citation statements)

References 10 publications

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“…Modulated current waveform during power swing for a twomachine equivalent power system can be modeled as follows [17], [27]:…”

Section: Proposed Methodsmentioning

confidence: 99%

“…A suitable value of p is N/4 [27]. With this the frequency estimation technique needs approximately one and half cycle samples to compute the frequencies.…”

Section: A Frequency Estimation During Power Swingmentioning

confidence: 99%

“…The proposed algorithm is to be initiated when power swing condition is detected in a power system [1], [29], [30], [31]. Since current signal oscillates during power swing, the frequency estimation becomes erroneous when the signal envelop is at minimum [27]. At this point the sample values become small and it may lead to incorrect frequency estimation.…”

Section: B Phasor Estimation Using Least Squares Techniquementioning

confidence: 99%

“…The previous frequency values are used during this period. A suitable value of ζ is 40% of the full load current [27].…”

Section: B Phasor Estimation Using Least Squares Techniquementioning

confidence: 99%

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Accurate Phasor Estimation During Power Swing

Rao

Pradhan

2016

IEEE Trans. Power Delivery

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“…Modulated current waveform during power swing for a twomachine equivalent power system can be modeled as follows [17], [27]:…”

Section: Proposed Methodsmentioning

confidence: 99%

“…A suitable value of p is N/4 [27]. With this the frequency estimation technique needs approximately one and half cycle samples to compute the frequencies.…”

Section: A Frequency Estimation During Power Swingmentioning

confidence: 99%

Section: B Phasor Estimation Using Least Squares Techniquementioning

confidence: 99%

“…The previous frequency values are used during this period. A suitable value of ζ is 40% of the full load current [27].…”

Section: B Phasor Estimation Using Least Squares Techniquementioning

confidence: 99%

See 2 more Smart Citations

Accurate Phasor Estimation During Power Swing

Rao

Pradhan

2016

IEEE Trans. Power Delivery

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“…Assuming that , the current signals can be written as follows: (9) where is the frequency of the current envelope and is the mean frequency of the sampled current. is and is [20]. Equations (8) and (9) express Fig.…”

Section: Proposed Algorithmmentioning

confidence: 99%

Detection of Symmetrical Faults by Distance Relays During Power Swings

Lotfifard

Faiz

Kezunovic

2010

IEEE Trans. Power Delivery

139

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For maintaining security of distance relays, power swing blocking is necessary to prevent unintended operation under power swings. To be dependable, distance relays must operate whenever a fault occurs. Therefore, detecting faults during power swings is an important issue since the relay should be able to differentiate the fault condition and not be blocked during that time. This paper presents a new method for detecting a symmetrical fault during a power swing, based on extracting components of the current waveform using the Prony method. The merit of the method is demonstrated by simulating different faults during power swing conditions using the Alternate Transients Program version of the Electromagnetic Transients Program.Index Terms-Distance relay, power swing, prony method, symmetrical fault.

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Approximate linear amplitude model based algorithm for measuring power system frequency

Yukita

et al. 2011

IEEJ Transactions Elec Engng

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A novel algorithm for measuring the power system frequency during a very short time is presented in this paper, based on an approximate linear current amplitude model. The presented measuring frequency algorithm is used to get the instantaneous value of the parameter accurately. In the algorithm, the amplitudes of four consecutive sampled currents are supposed to be linear. After rigorous mathematical deduction, including Taylor series expansion and the geometric proportion theorem, the instantaneous frequency could be derived. The errors arising from the linearization in the model are analyzed qualitatively, and then the errors of A/D conversion and Taylor series expansion are considered. By the proposed technique, the measured frequency can be derived easily, quickly, and accurately, without any digital filters. The results after simulation show that the proposed algorithm has high accuracy and noise immunity during power swings and in the normal state. 

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Real-Time Measurement of Mean Frequency in Two-Machine System During Power Swings

Cited by 21 publications

References 10 publications

Accurate Phasor Estimation During Power Swing

Accurate Phasor Estimation During Power Swing

Detection of Symmetrical Faults by Distance Relays During Power Swings

Approximate linear amplitude model based algorithm for measuring power system frequency

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