Journal ArticleDOI
Harmonic impedance measurement using three-phase transients
M. Nagpal,Wilsun Xu,J. Sawada +2 more
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TLDR
In this paper, a technique is presented for measuring the harmonic impedances of an unbalanced three-phase distribution feeder using transients in bus voltages and feeder currents generated by several close-trip operations of the shunt capacitor bank.Abstract:
In this paper, a technique is presented for measuring the harmonic impedances of an unbalanced three-phase distribution feeder. The technique uses transients in bus voltages and feeder currents generated by several close-trip operations of the shunt capacitor bank. The work is based on the assumption that the impedance of the feeder does not change over time during which the switching operations are performed. Mathematical development of the technique is verified with the laboratory and the field tests. The technique provided good measurements of the harmonic impedances up to 1.5 kHz for the given capacitor sizes. Statistical indices were developed to assess the accuracy of the estimated impedance values.read more
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Adaptive Control of Grid-Connected Inverters Based on Online Grid Impedance Measurements
Mauricio Cespedes,Jian Sun +1 more
TL;DR: In this paper, the authors proposed a gain-scheduling adaptive control system that uses online grid impedance measurements, where an impulse response analysis method is programmed in the digital-signal processor (DSP) of the grid-connected inverter.
Journal ArticleDOI
Power system harmonics research: a survey
TL;DR: A review of power system harmonics research and development can be found in this article, where the authors highlight the current and future issues involved in the development of quality and reliable electric power technology for future applications.
Journal ArticleDOI
A technique for power supply harmonic impedance estimation using a controlled voltage disturbance
TL;DR: In this article, a method for power system impedance estimation is presented, which employs a power converter to inject a voltage transient onto the supply system, and the impedance is estimated through correlation of the measured voltage and current transients.
Journal ArticleDOI
Further improvements on impedance-based fault location for power distribution systems
TL;DR: In this article, the capacitive effect consideration on impedance-based fault location methods, by considering an exact line segment model for the distribution line, is considered and further improvements regarding the fault location problem for power distribution systems are presented.
Journal ArticleDOI
Impedance measurement for improved power quality-Part 1: the measurement technique
TL;DR: In this article, an improved power system impedance measurement technique is introduced, which injects a short duration current spike into the supply, and derives the impedance from the measured current and voltage.
References
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Journal ArticleDOI
Frequency domain techniques for modeling distribution or transmission networks using capacitor switching induced transients
Adly A. Girgis,R. Brent McManis +1 more
TL;DR: In this article, two frequency domain methods were presented to model and identify the equivalent impedance transfer function of a distribution or transmission system using recorded voltage and current transients due to capacitor switching.
Journal ArticleDOI
Identification and Modelling of Load Characteristics at High Frequencies
A. S. Morched,P. Kundur +1 more
TL;DR: In this paper, a simple technique for identifying the high frequency characteristics of a load feeder is presented, based on applying signal processing techniques to the transient bus voltage and feeder current produced by a capacitor bank switching operation.
Journal ArticleDOI
Measurement of Power System Subsynchronous Driving Point Impedance and Comparison With Computer Simulations
TL;DR: In this paper, the authors presented a technique to extract the subsynchronous positive sequence driving point impedance in relation to frequency of an operating power system from a staged phase-to-phase fault.