Proceedings ArticleDOI
Voltage sag and swell generator with thyristor controlled reactor
Y.H. Chung,G.H. Kwon,T.B. Park,G.Y. Lim +3 more
- Vol. 3, pp 1933-1937
TLDR
In this article, a new economical sag/swell voltage generator suitable for the evaluation of high power custom power devices such as DVR (dynamic voltage restorer) and DSTATCOM (distribution static compensator) was designed to generate the several power quality disturbances in MVA power ratings.Abstract:
This paper describes a new economical sag/swell voltage generator suitable for the evaluation of high power custom power devices such as DVR (dynamic voltage restorer) and DSTATCOM (distribution static compensator). Proposed system was designed to generate the several power quality disturbances in MVA power ratings-sag, swell, under voltage, over voltage and harmonic distortions. The sag and the under voltage can be generated by voltage drop across a reactor, while its magnitude and durations can be controlled by the firing angle of TCR (thyristor controlled reactor). In the case of the swell and the over voltage, we need a step-up transformer. Output of the step-up transformer is regulated by TCR to obtain nominal voltage level. At any given instant, if the firing angle of TCR is retarded or stopped, then we can obtain the swell voltage or the over voltage disturbance. Also we can generate harmonic current by controlling firing angles of TCR, while keeping the system voltage level within the specified limits. In this paper, two identical three-phase wye-connected TCRs are connected to the secondary windings of two step-down transformers, one operated from wye-wye transformer, the other from delta-wye transformer. Harmonic filters (11/sup th/ and 13/sup th/) are added to reduce the voltage distortion when TCRs are operated. Simulation results are given for several cases of voltage sag and swell generations. Design guidelines are given for the TCR. Finally, conclusions are given.read more
Citations
More filters
Journal ArticleDOI
Implementation of Fault Ride-Through Techniques of Grid-Connected Inverter for Distributed Energy Resources With Adaptive Low-Pass Notch PLL
TL;DR: In this paper, the authors proposed fault ride-through techniques based on a low-pass notch phase-locked loop (LPN)-PLL, which has not only fast and smooth transient responses to a sudden transition of the grid voltage but also has robustness to the distorted and unbalanced grid conditions.
Proceedings ArticleDOI
Transformer based voltage sag generator to perform LVRT and HVRT tests in the laboratory
TL;DR: In this article, a transformer based voltage sag generator to test renewable energy systems is presented. But design considerations concerning overvoltages and overcurrents during switching action are adressed.
Journal ArticleDOI
Extending the Power Capability With Dynamic Performance of a Power-Hardware-in-the-Loop Application—Power Grid Emulator Using “Inverter Cumulation”
TL;DR: In this paper, a power-hardware-in-the-loop (PHiL) grid emulation system combining two inverters with different electrical characteristics (type of semiconductor, switching frequency, dc link, etc.).
Proceedings ArticleDOI
A single-phase voltage sag generator for testing electrical equipments
Yan Ma,G.G. Karady +1 more
TL;DR: In this article, a transformer-based voltage sag generator (VSG) is proposed to evaluate the susceptibility of electrical equipment to voltage sag, which can work as a voltage swell generator and a voltage interruption generator.
Proceedings ArticleDOI
Design of a voltage sag generator based on impedance switching
TL;DR: In this paper, an experimental setup of a voltage sag generator (VSG) based on impedance switching is described, where bidirectional switches with IGBTs, snubber and clamping circuits are adopted to obtain fast turn on, turn off while avoiding undesirable voltages and currents stresses.
References
More filters
Book
Understanding Power Quality Problems: Voltage Sags and Interruptions
TL;DR: This is the first book to offer in-depth analysis of voltage sags and interruptions and to show how to apply mathematical techniques for practical solutions to these disturbances.
Book
Reactive Power Control In Electric Systems
TL;DR: Theory of load compensation and reactive power control in electric transmission systems has been studied in this article, with a focus on the effects of reactive power on the dynamic performance of transmission systems.
Understanding Power Quality Problems, Voltage Sags and Interruptions
TL;DR: In this paper, the authors present the theoretical background necessary for understanding how to analyze, predict, and mitigate the two most severe power disturbances: voltage sags and interruptions, and show how to apply mathematical techniques for practical solutions to these disturbances.
Journal ArticleDOI
Power electronics in electric utilities: static VAR compensators
TL;DR: In this article, the authors deal with dynamic VAR compensation of electric power systems, applying power electronics for reactive power generation and control, and show how the dynamic compensation increased transmittable power by providing voltage support, transient stability improvement, and power oscillation damping in electric power transmission systems.
Journal ArticleDOI
Reactive Power Generation and Control by Thyristor Circuits
TL;DR: In this paper, static var generators function as variable reactances (capacitive or inductive impedances) or controllable ac current and voltage sources, and new approaches are described in which power frequency changers (cycloconverters) are employed.