Instantaneous positive‐sequence current applied for detecting voltage sag sources

Polajžer, Boštjan; Štumberger, Gorazd; Dolinar, Drago

doi:10.1049/iet-gtd.2014.0483

Cited by 31 publications

(13 citation statements)

References 41 publications

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“…Furthermore, since voltage sags are a transient event, the same authors generalized and improved methods 7,[16][17][18] based on Clarke's components, 9,28,30 as well as methods based on a vector written in Clarke's components, 31 by using instantaneous positive sequence components. 32 These generalizations improved the accuracy of relative location of sag sources. Then, Mohammadi et al generalized methods 7,16,17,21,24 to the new methods 33 based on instantaneous positive sequence components.…”

Section: Previous and Related Workmentioning

confidence: 98%

Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems

Mohammadi

Leborgne

2020

Int Trans Electr Energ Syst

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Summary Constant power (Scte) loads such as large induction motors or power converters in customer facilities of distribution systems have a significant effect on the fault currents and thus on the relative location of voltage sag sources. This paper evaluates the methods for determining the relative location of voltage sag sources at the point of common coupling (PCC) of Scte loads. The results of simulating 800 voltage sag events on IEEE 13 bus unbalance system (modelled by ATP) show that many of the methods fail at classifying upstream (US) faults at the PCC of Scte loads. Therefore, a new method is introduced using the ratio of current magnitudes and changes of power angle in positive sequence components, during and before the voltage sag, with a determined threshold for the currents and a specified tolerance for the power angle obtained from voltage sags generated by different fault types. The results obtained in the proposed index for similar simulation cases show that the method applied to monitors installed at the PCC of the Scte loads is very accurate. Also, the proposed index is effective for higher resistance faults and changes in the short circuit capacity (SCC) of the main grid.

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Section: Previous and Related Workmentioning

confidence: 98%

Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems

Mohammadi

Leborgne

2020

Int Trans Electr Energ Syst

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“…In Ref. [16], based on the instantaneous symmetrical components, instantaneous positive sequence current was applied to detect voltage sag sources. Besides, it has been proven by numerous simulation results.…”

Section: Introductionmentioning

confidence: 99%

Effects of damper winding, eddy current, and leakage flux on magnetic field distortion and stator electrical quantity research of nuclear power turbo‐generator under external asymmetry

Zidian

Zhao

et al. 2019

IEEJ Transactions Elec Engng

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One phase overload or lightload condition is a very common condition in nuclear power turbo-generators, and magnetic field distortion and current asymmetrical degree concern the safe operation of turbo-generators. Damper and wedge windings are the special parts that distinguish the nuclear power generators from other smaller generators. Therefore, it is extremely important to investigate magnetic field distortion and stator electrical quantity. At the beginning, taking saturation and slot effects into account, the finite element model of a 1400MVA nuclear power generator is built up. And through comparison between the finite element simulation and the experimental results of no-load characteristics and short-circuit characteristics, the effectiveness of the finite element model was fully tested. Then, with or without damper and wedge windings, and leakage flux, the negative sequence equivalent circuit is employed to explain the law of magnetic field distortion under stator negative current, which is also verified by finite element simulation. Based on a novel theory proposed in this article, the law of the stator positive and negative sequence current, and the current asymmetrical degree with alteration of one-phase load under steady state are given in detail. Additionally, the finite element method is developed to test the correctness of the novel theory. The influence of damper and wedge windings, leakage flux at coil ends, and eddy current on the solid magnetic-pole of rotors on stator electrical quantity is also discussed in detail.Lv Pin (Non-member) was born in Harbin in China, on November 8, 1989. She graduated from Harbin University of Science and Technology and obtained her master and doctor diploma there. Currently, she is working at Heilongjiang University of Science and Technology. She is doing her postdoctoral research at China University of Mining and Technology. She is specialized in electric apparatus theoretical analysis, fault diagnosis, and simulation calculation. She also has plenty of knowledge about insulation calculation and smart-grids. Additionally, she is an expert at the new energy machines. Xie Zidian (Non-member) He was born in Hebei in China in 1962. Currently, he is working at Heilongjiang University of Science and Technology as a professor. He is specialized in design and research of microcomputer-integrated controllers for coal mining machine. Zhao Hongsen (Non-member) He was born in Harbin in China, on June 25, 1987. He graduated from Harbin University of Science and Technology and obtained his master and doctor diploma there. Currently, he is working at Lishui University. He is specialized in electric apparatus internal fault diagnosis and protection. Ge Baojun (Non-member) He was born in China in 1960. Currently, he is working at Harbin University of Science and Technology as a professor.He is specialized in the design and research of large generators, pumped storage motor, energy converter, and special motor. Now, he is the chief editor of Electric Machines and Control, which ...

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“…Voltage sags (also called voltage dips) are decreases of grid-voltage root-meansquare (RMS) value with relative short duration, which can cause undesirable equipment trips (Klaić, 2014) and problems in industrial processes (Kazemi, 2013). They are caused by short-duration increases in currents (Polajžer, 2015) because of faults in the transmission or distribution network (Klaić, 2014), heavy load switching, motor starting and energizing transformers (Bagheri, 2018). The occurrence of voltage sags may have significant impact on a drive employing a line-start interior permanent magnet synchronous motor (LSIPMSM), even more severe than those directly related to induction motors (IMs) (Guasch, 2004).…”

Section: Introductionmentioning

confidence: 99%

MTPA Control Strategy For Interior Permanent Magnet Synchronous Machines Derived Using Current Dependent Flux Linkage Functions

Hanić¹,

Vuljaj²,

Stipetić³

et al. 2019

7th Symposium on Applied Electromagnetics SAEM`18: Conference Proceedings

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Instantaneous positive‐sequence current applied for detecting voltage sag sources

Cited by 31 publications

References 41 publications

Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems

Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems

Effects of damper winding, eddy current, and leakage flux on magnetic field distortion and stator electrical quantity research of nuclear power turbo‐generator under external asymmetry

MTPA Control Strategy For Interior Permanent Magnet Synchronous Machines Derived Using Current Dependent Flux Linkage Functions

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