Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Generator Voltage Control01:21

Generator Voltage Control

187
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
187
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

408
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
408
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

167
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...
167
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

276
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
276
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

111
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...
111
Reducing Line Loss01:18

Reducing Line Loss

173
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
173

You might also read

Related Articles

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

Sort by
Same author

Accurate Active and Reactive Power Sharing Based on a Modified Droop Control Method for Islanded Microgrids.

Sensors (Basel, Switzerland)·2023
Same author

Corner-Point and Foreground-Area IoU Loss: Better Localization of Small Objects in Bounding Box Regression.

Sensors (Basel, Switzerland)·2023
Same author

A New Gain-Phase Error Pre-Calibration Method for Uniform Linear Arrays.

Sensors (Basel, Switzerland)·2023
See all related articles

Related Experiment Video

Updated: Jul 19, 2025

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

Published on: February 14, 2025

506

An Adaptive Virtual Impedance Method for Grid-Connected Current Quality Improvement of a Single-Phase Virtual

Caomao Zhong1,2, Zhi Zhang1, Anan Zhu1

  • 1Department of Electrical Engineering and Automation, Dongguan University of Technology, Dongguan 523808, China.

Sensors (Basel, Switzerland)
|August 12, 2023
PubMed
Summary

This study proposes an adaptive virtual harmonic resistor strategy to suppress harmonic current distortions in weak power grids. The method enhances grid-connected current quality, improving power system stability and reliability.

Keywords:
VSGharmonic suppressionvirtual impedanceweak grid

More Related Videos

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
06:45

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

1.7K
Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces
07:51

Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces

Published on: February 24, 2012

24.7K

Related Experiment Videos

Last Updated: Jul 19, 2025

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

Published on: February 14, 2025

506
Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
06:45

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

1.7K
Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces
07:51

Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces

Published on: February 24, 2012

24.7K

Area of Science:

  • Electrical Engineering
  • Power Systems
  • Renewable Energy Integration

Background:

  • Increasing distributed generation systems lead to weak grid characteristics.
  • Voltage-sourced grid-connected inverters enhance weak grid stability but are susceptible to background harmonics.
  • Grid voltage harmonics distort grid-connected current, degrading power quality.

Purpose of the Study:

  • To propose and validate an adaptive virtual harmonic resistor strategy for suppressing harmonic current distortions.
  • To enhance the quality of grid-connected current in weak power grids.
  • To analyze the stability of the proposed control strategy.

Main Methods:

  • Introduction to the virtual synchronous generator (VSG) principle.
  • Analysis of voltage source inverter output current to understand harmonic generation.
  • Development of a signal separation module using multiple second-order generalized integrators.
  • Adaptive adjustment of virtual harmonic resistance based on harmonic content feedback.
  • Stability analysis using root locus of the open-loop transfer function.

Main Results:

  • Effective separation of fundamental and harmonic currents from grid-connected current.
  • Adaptive suppression of harmonic current distortions caused by grid voltage harmonics.
  • Demonstrated enhancement in grid-connected current quality.
  • Validation of the proposed strategy through MATLAB/Simulink simulations and experimental results.

Conclusions:

  • The proposed adaptive virtual harmonic resistor strategy effectively suppresses harmonic current distortions in weak grids.
  • The method significantly improves grid-connected current quality, contributing to overall power system stability.
  • The strategy offers a viable solution for mitigating harmonic issues in grids with high penetration of distributed generation.