Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Power in a Three-Phase Circuit

Power in a Three-Phase Circuit

Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...

Power Distribution in Three-phase and Single Phase Circuits

Power Distribution in Three-phase and Single Phase Circuits

Power distribution within electrical circuits is a foundational aspect of residential and industrial energy systems. While single-phase power is common in residential settings, three-phase power is the standard for industrial environments with heavy machinery. Each system is different and has advantages, and it's crucial to understand the underlying principles of power distribution and material efficiency.
Single-Phase Power Distribution:
Single-phase circuits are typical in household settings;...

The Power Flow Problem and Solution

The Power Flow Problem and Solution

Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk, phase angle δk, real power Pk, and reactive power Qk. Two of these four variables are inputs, while the power...

Power System Three-Phase Short Circuits

Power System Three-Phase Short Circuits

Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...

Three-Phase Short Circuit—Unloaded Synchronous Machine

Three-Phase Short Circuit—Unloaded Synchronous Machine

Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...

Line Loss

Line Loss

The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Retrospective study of irinotecan/cisplatin followed by etoposide/cisplatin or the reverse sequence in extensive-stage small cell lung cancer.

OncoTargets and therapy·2015

Same author

Nephrolithiasis as a Risk Factor for CKD: The Atherosclerosis Risk in Communities Study.

Clinical journal of the American Society of Nephrology : CJASN·2015

Same author

Genome Evolution and Innovation across the Four Major Lineages of Cryptococcus gattii.

mBio·2015

Same author

Hirsutinolide Series Inhibit Stat3 Activity, Alter GCN1, MAP1B, Hsp105, G6PD, Vimentin, TrxR1, and Importin α-2 Expression, and Induce Antitumor Effects against Human Glioma.

Journal of medicinal chemistry·2015

Same author

Chemokines and Their Receptors: Potential Therapeutic Targets for Bone Cancer Pain.

Current pharmaceutical design·2015

Same author

[A case report of gastric cancer complicated with chronic lymphocytic leukemia].

Zhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi·2015

Same journal

The Eco-Friendly Preparation of Se, Zn, and Ag MONPs and Their Current Medical Applications and Drug Delivery for AD Diseases.

TheScientificWorldJournal·2026

Same journal

Fear of COVID-19: A Comparative Study Among University Students in Peru.

TheScientificWorldJournal·2026

Same journal

Opportunities and Challenges of Integrating Ethiopian Traditional Medicine System Into Modern Medicine: A Narrative Review.

TheScientificWorldJournal·2026

Same journal

Exploring the Antiparasitic Activity of the Sea Cucumber Isostichopus sp. aff. badionotus From the Northern Coast of Colombia Against Trypanosoma cruzi.

TheScientificWorldJournal·2026

Same journal

Kalanchoe ceratophylla (Crassulaceae): The True Identity of Sidingin, a Medicinal Plant From Sumatra, Based on Morphological and Molecular Evidence.

TheScientificWorldJournal·2026

Same journal

Genetic Variation of Chicken Growth Differentiation Factor-9 Gene and Association With Egg Characteristics: A Systematic Review.

TheScientificWorldJournal·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Apr 25, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Published on: October 28, 2022

Accurate parameter estimation for unbalanced three-phase system.

Yuan Chen¹, Hing Cheung So¹

¹Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong.

Thescientificworldjournal

|August 28, 2014

Summary

This summary is machine-generated.

This study introduces a nonlinear least squares (NLS) estimator for smart grid parameter estimation. The NLS method accurately determines frequency, phase, and voltage, outperforming other techniques.

More Related Videos

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

Published on: July 5, 2024

Related Experiment Videos

Last Updated: Apr 25, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Published on: October 28, 2022

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

Published on: July 5, 2024

Area of Science:

Electrical Engineering
Power Systems
Signal Processing

Background:

Smart grids are essential for modern electricity networks, often utilizing unbalanced three-phase power systems.
Accurate parameter estimation is crucial for the effective operation and control of these systems.

Purpose of the Study:

To develop and analyze an advanced parameter estimation technique for unbalanced three-phase smart grid systems.
To accurately estimate key parameters including frequency, phase, and voltage.

Main Methods:

Utilizing the α β-transformation to convert three-phase waveforms into orthogonal signals.
Developing a nonlinear least squares (NLS) estimator implemented via the Newton-Raphson scheme.
Analyzing the global convergence properties of the Newton-Raphson scheme for the NLS estimator.

Main Results:

The NLS estimator demonstrates accurate estimation of frequency, phase, and voltage parameters.
Mean square error performance of the NLS method approaches the Cramér-Rao lower bound.
The proposed NLS method offers superior frequency estimation accuracy compared to complex least mean square (CLMS) and augmented CLMS methods.

Conclusions:

The developed NLS estimator provides a robust and accurate solution for parameter estimation in unbalanced three-phase smart grids.
The method's performance validates its potential for enhancing smart grid control and stability.
Further research can explore the application of this estimator in real-time smart grid monitoring and management.