A New Approach to Determine the Optimal Number and Arrangement of Power Quality Monitors for Voltage Sag Detection

2019 ◽  
Author(s):  
Raif Alicic ◽  
Senad Smaka
Keyword(s):  
Power Quality ◽  
Optimal Number ◽  
Voltage Sag ◽  
New Approach ◽  
Voltage Sag Detection

Real-time voltage sag detection and classification for power quality diagnostics

Measurement ◽  
2020 ◽  
Vol 164 ◽  
pp. 108097
Author(s):  
Erick A. Nagata ◽  
Danton D. Ferreira ◽  
Math H.J. Bollen ◽  
Bruno H.G. Barbosa ◽  
Eduardo G. Ribeiro ◽  
...  
Keyword(s):  
Real Time ◽  
Power Quality ◽  
Voltage Sag ◽  
Voltage Sag Detection ◽  
Quality Diagnostics

Voltage Sag Detection Method Based on Wavelet Information

2015 ◽  
Vol 740 ◽  
pp. 470-473
Author(s):  
Da Hai Zhang ◽  
Cheng Yu Ge ◽  
Chen Chen ◽  
Xian He Han
Keyword(s):  
Wavelet Analysis ◽  
Power Quality ◽  
Detection Method ◽  
Voltage Sag ◽  
Major Power ◽  
Wavelet Method ◽  
Quality Problem ◽  
Local Maxima ◽  
Multi Scale ◽  
Voltage Sag Detection

Voltage sag is the major power quality problem and receives wide attention. Although wavelet analysis works well for detecting voltage sag features, the existence of noise can reduce the advantages of wavelet method or even make it ineffective. To solve the problem, the paper uses multi-scale wavelet information by multiplying the results of several scales, and then searches the local maxima from the product to find the transition moment of voltage sag. The proposed method can suppress the noise and improve the accuracy for detecting voltage sag features. Simulation result validates the effectiveness of the proposed method.

Based on Lifting Wavelet Voltage Sag Detection Algorithm and Achieve

2013 ◽  
Vol 378 ◽  
pp. 335-339
Author(s):  
Xin Liang Yin ◽  
Gui Tang Wang ◽  
Zhi Wen Feng ◽  
Xiong Hui Lai
Keyword(s):  
Wavelet Transform ◽  
Power Quality ◽  
Hardware Implementation ◽  
Detection Algorithm ◽  
Voltage Sag ◽  
Lifting Wavelet Transform ◽  
Voltage Sag Detection ◽  
Lifting Wavelet ◽  
The Fourier Transform ◽  
Transient Power Quality

Voltage sag belongs to a kind of transient power quality problems, it possesses short mutations, non-stationary characteristics and the detection on the interference is difficult. Wavelet transform is a better signal analysis method and it is very suitable for analysis of mutations in the signal. Compared with traditional wavelet transform algorithm, Wavelet transform algorithm does not depend on the ascension of the Fourier transform and it reduces the computation complexity, so it is very suitable for hardware implementation. This paper introduces a design based on 9/7 of lifting wavelet transform of the voltage sag detection algorithm, and realized in the FPGA and modeling the transient power quality signal in the Matlab. To make hardware implementation easier, a series of optimization to the coefficient of ascension of 9/7 of lifting wavelet transform was carried out. The results show that 9/7 of the lifting wavelet transform algorithm can effectively test the end time of the voltage sag happens.

scholarly journals Research of Microgrid Stability with Voltage Sag Detection using Instantaneous Features Extraction

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1239-1241
Keyword(s):  
Power Quality ◽  
Negative Impact ◽  
Features Extraction ◽  
System Stability ◽  
Voltage Sag ◽  
Power Sources ◽  
Energy And Environment ◽  
Fault Ride Through ◽  
Voltage Sag Detection ◽  
Sustainable Power

With the inexorably serious energy shortage and environment contamination, the wide utilization of the well known sustainable power sources are considered as successful approaches to improve the energy and environment circumstance. The negative impact on the system stability couldn't be overlooked for their irregular, fluctuant and arbitrary attributes. Intending to think about the strength of microgrid with access of Instantaneous Features Extraction is one of the most productive methods for successful utilization of these grids. In this way a proactive tracking, counteract fault ride-through the sustainable sources, bring about limiting downtime and improving the profitability. In this unique situation, this paper proposes Instantaneous Features Extraction calculation for the identification of voltage droops as they are the most frequently experienced power quality aggravations. Hence takes into consideration early discovery of power quality degeneration improves the profitability.

scholarly journals Mitigation of Voltage Dip and Voltage Flickering by Multilevel D-STATCOM

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
M. S. Ballal ◽  
H. M. Suryawanshi ◽  
T. Venkateswara Reddy
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Reactive Power ◽  
Distribution Network ◽  
Voltage Sag ◽  
Service Interruptions ◽  
Flexible Ac Transmission ◽  
Voltage Dip ◽  
Basic Power ◽  
Ac Transmission

The basic power quality problems in the distribution network are voltage sag (dip), voltage flickering, and the service interruptions. STATCOM is a Flexible AC Transmission Systems (FACTS) technology device which can independently control the flow of reactive power. This paper presents the simulation and analysis of a STATCOM for voltage dip and voltage flickering mitigation. Simulations are carried out in MATLAB/Simulink to validate the performance of the STATCOM. A comparison between the six-pulse inverter and the five-level diode-clamped inverter is carried out for the performance of 66/11 KV distribution system.

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