scholarly journals Inrush Current Based on Fast Fourier Transform

2021 ◽  
Vol 8 (2) ◽  
pp. 114
Author(s):  
Mochamad Ilham Zamzami ◽  
Eka Prasetyono ◽  
Dimas Okky Anggriawan ◽  
Mike Yuliana
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
System Modeling ◽  
Harmonic Distortion ◽  
Electrical Equipment ◽  
Transient Condition ◽  
Inrush Current ◽  
Simulation Data ◽  
Electrical Components ◽  
Incandescent Lamps

Advances in technology have caused the use of electricity to increase rapidly. With advances in technology, this is followed by the use of increasingly efficient electrical components or equipment. This more efficient electrical equipment causes the impedance of the component to be smaller, causing a surge in current when it is turned on. This current surge, if not followed by appropriate safety precautions, will be damage other components. Each load has different waveform characteristics and current transient peaks. For this reason, it is necessary to analyze the transient condition of a load to overcome this. This paper will explain the characteristics of the inrush current of the load due to ignition. There are three loads used in this study, namely resistive, capacitive and inductive loads. Then the use of this load is simulated by giving different ignition angle values, namely 0, 60, and 90 degrees. The analysis used is the Fast Fourier Transform (FFT) method which is a derivative of the Discrete Fourier Transform. The inrush current spectrum in this simulation is simulated using Simulink MATLAB with switching system modeling using TRIAC. This inrush current simulation data collection uses a sampling frequency of 100 Khz and will be analyzed in the first of 5 cycles. For each load in this paper, the harmonic values for each ignition angle will be presented. The simulation results show that the inrush current is caused by the ignition angle value used and because of components that can deviate energy such as inductors and capacitors as well as components which at the time of starting have a low impedance value such as incandescent lamps. The simulation also shows that the use of switching components for setting the ignition angle causes an increase in the value of Total Harmonic Distortion (THD) but the peak current in the first cycle when the ignition angle is set decreases.

scholarly journals Load Identification Using Harmonic Based on Probabilistic Neural Network

2019 ◽  
Vol 7 (1) ◽  
pp. 71-82
Author(s):  
Dimas Okky Anggriawan ◽  
Aidin Amsyar ◽  
Eka Prasetyono ◽  
Endro Wahjono ◽  
Indhana Sudiharto ◽  
...  
Keyword(s):  
Neural Network ◽  
Fourier Transform ◽  
Probabilistic Neural Network ◽  
Harmonic Distortion ◽  
Electrical Equipment ◽  
High Accuracy ◽  
Current Sensor ◽  
Harmonic Load ◽  
Load Identification ◽  
Current Waveform

Due to increase power quality which are caused by harmonic distortion it could be affected malfunction electrical equipment. Therefore, identification of harmonic loads become important attention  in the power system. According to those problems, this paper proposes a Load Identification using harmonic based on probabilistic neural network (PNN). Harmonic is obtained by experiment using prototype, which it consists of microcontroller and current sensor. Fast Fourier Transform (FFT) method to analyze of current waveform on loads become harmonic load data. PNN is used to identify the type of load. To load identification, PNN is trained to get the new weight. Testing is conducted To evaluate of the accuracy of the PNN from combination of four loads. The results demonstrate that this method has high accuracy to determine type of loads based on harmonic load

scholarly journals Comparison and Analysis of Magnetizing Inrush and Fault Condition for Power Transformer

2018 ◽  
Vol 7 (4.5) ◽  
pp. 126 ◽  
Author(s):  
Mudita Banerjee ◽  
Dr. Anita Khosla
Keyword(s):  
Fourier Transform ◽  
Normal Condition ◽  
Power Transformer ◽  
Harmonic Distortion ◽  
Inrush Current ◽  
Harmonic Content ◽  
Internal Fault ◽  
Magnetizing Inrush Current ◽  
Comparison And Analysis ◽  
Primary Current

This paper presents the second harmonics present in the primary current of a power transformer at different conditions using Fast Fourier Transform and Total Harmonic Distortion techniques to analyze the inrush condition and to distinguish it with fault condition of a power transformer. Result shows that the 2nd harmonic content is pre-dominant in inrush condition of primary current of the power transformer. It is observed that there are significant differences amongst the parameters found during inrush condition, normal condition and internal fault condition which are useful in the identification of magnetizing inrush current of power transformer. The simulation is done in MATLAB/SIMULINK. 

Harmonic Analysis of Multilevel H-Bridge Inverter with Reduced Switches for Solar Power Applications

2020 ◽  
Vol 17 (11) ◽  
pp. 4925-4929
Author(s):  
S. Krishnan ◽  
N. Ravikumar ◽  
P. Thirumal ◽  
R. Balamurali
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Life Span ◽  
Harmonic Analysis ◽  
Traditional Method ◽  
Solar Power ◽  
Electronic Device ◽  
Harmonic Distortion ◽  
Multilevel Converter ◽  
Triggering Circuit

A multilevel H-bridge dc–ac converter is an electronic device, the multilevel converter enhanced stepped output with less switches. This paper deals with H-Bridge multilevel converter it requires only few switches when compared to traditional method. So in proposed method using only few switches, and it requires less gate triggering circuit. Less switches will operates for certain period of time. The proposed circuit is simulated using MATLAB software in that fast Fourier transform test to find the total harmonic distortion. With the proposed method multilevel converter can be used in solar power applications to convert dc supply into ac supply, it produces less harmonics it will enhance life span of the motor and efficiency of the motor will raise because in proposed multilevel converter there is a less switches are used.

HARMONIC DISTORTION ANALYSIS BASED ON HOPF BIFURCATION THEOREM AND FAST FOURIER TRANSFORM

2007 ◽  
Vol 17 (05) ◽  
pp. 1623-1635 ◽  
Author(s):  
F. I. ROBBIO ◽  
E. E. PAOLINI ◽  
J. L. MOIOLA ◽  
G. CHEN
Keyword(s):  
Fourier Transform ◽  
Hopf Bifurcation ◽  
Fast Fourier Transform ◽  
Frequency Domain ◽  
Harmonic Distortion ◽  
Period Doubling ◽  
Frequency Domain Method ◽  
Colpitts Oscillator ◽  
Eighth Order ◽  
Domain Method

A frequency domain method is used to estimate the harmonic contents of a smooth oscillation arising from the Hopf bifurcation mechanism. The harmonic contents up to the eighth-order are well estimated, which agree with the results obtained from a completely different approach that measures the frequency content of a signal by using digital signal processing techniques such as the Fast Fourier Transform (FFT). The accuracy of the approximation is evaluated by computing the Floquet multipliers of the variational system based on the fact that for periodic solutions one multiplier must be +1. The separation from this theoretical value is proportional to the error of the approximation. A limitation of the frequency domain method is encountered when being used for continuing the secondary branch of limit cycle bifurcations, such as pitchfork and period-doubling bifurcations. Two examples are shown to illustrate the main results: Colpitts' oscillator with a pitchfork bifurcation of cycles, and Chua's circuit with a period-doubling bifurcation of cycles.

scholarly journals Wavelet Transform Implementation to Differentiate Inrush Current and Fault Current in Power Transformer

2020 ◽  
Vol 8 (5) ◽  
pp. 3041-3044
Keyword(s):  
Fourier Transform ◽  
Wavelet Transform ◽  
Fast Fourier Transform ◽  
Power Transformer ◽  
Normal Faults ◽  
Inrush Current ◽  
Fault Current ◽  
Electrical System ◽  
Protection Circuit ◽  
Internal Faults

An electrical system is al complex network, to enhance power generation, transmission and distribution transformers play an important role. Power transformer is the heart of the electrical system. Even though electrical power is generated at lower rate in the coastal areas, it can be transmitted easily over hundreds of kilometer with the help of power transformer. So there must proper protection should given to power transformers. But in order to give the proper protection there should be proper discrimination between internal faults and inrush current. If there is no proper differentiation between faults and inrush current phenomena than the protection circuit will not trip when inrush current comes into the picture. But the protection circuit will trip at faster rate than the actual one when the normal faults or internal faults come into the picture. So there should be proper discrimination between inrush current and internal fault current so that the protection circuit will work properly. There are so many techniques available to get differentiation between inrush current and fault current. Fast Fourier transform is one of the method to differentiate between these two currents. Here we are using wavelet transform technique to get the difference between these two currents. The properties of the inrush current obtained from this technique are accurate and distinct from those obtained from the fast Fourier transform. The experimental set up is carried out in matlab simulink and results were discussed as shown below in results.

scholarly journals Transformer Based Cascaded Multilevel Inverter with Reduced Number of Switches

2021 ◽  
Vol 9 (11) ◽  
pp. 1299-1314
Author(s):  
Dr. T. Murali Mohan
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Power Distribution ◽  
Harmonic Distortion ◽  
Balance Of Power ◽  
Multilevel Inverter ◽  
Two Stage ◽  
Fast Fourier Transform Analysis ◽  
Index Terms ◽  
Cascaded Multilevel Inverter

Abstract: This project presents the simulation of “transformer based cascaded multilevel inverter with reduced number of switches” with R-load and. It has the advantages of reduced number of switches and dc sources compared to conventional configurations and consequently higher efficiency. The simulation is accomplished for one stage (3-level), two stage (5-level, 7- level, 9-level), three stage (7-level, 11-level, 15-level, 19-level, 27-level) and four stage (29-level, 31-level, 33-level, 35-level). And their performance is analysed in terms of THD (Total Harmonic Distortion) for output voltages and currents. The FFT (Fast Fourier Transform) analysis is used in order to evaluate the harmonic distortion. The simulation is carried out by using MATLAB/SIMULINK software. Index Terms: cascaded asymmetric multilevel inverter, transformer-based cascaded multilevel inverter, balance of power distribution.

scholarly journals Implementasi Fast Fourier Transform dalam Pengembangan Alat dan Bantuan Program Untuk Mengukur Total Harmonic Distortion

2019 ◽  
Vol 9 (01) ◽  
pp. 15-22
Author(s):  
Setya - Ardhi ◽  
Judi Prajetno Sugiono ◽  
Hari Sutikno ◽  
Ivan B. Sasaka
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion

Total Harmonic Distortion (THD) adalah salah satu parameter yang menyatakan kualitas dari sebuah sinyal listrik yang hendak dipergunakan dibandingkan dengan sinyal sinusoidal murni. THD adalah suatu ukuran yang menyatakan seberapa besar sinyal yang tidak lagi berbentuk seperti aslinya. Dengan Analisa Fourier, besarnya THD dinyatakan sebagai perbandingan dari rata-rata geometris dari akar jumlah kuadrat harmonisa terhadap fundamental frekuensinya. Penelitian ini bertujuan membangun sebuah alat pengukur THD dengan memanfaatkan microcontroller AVR untuk menghitung THD secara digital. Perhitungan Harmonisa sinyal dalam deret Fourier tidak dilakukan degan cara tradisional, tetapi dilakukan dengan algoritma Fast Fourier Transform (FFT). Algoritma ini secara komputasi numeris akan memberikan kecepatan hitung yang lebih baik dibanding dengan perhitungan tradisional. Uji coba alat dilakukan dengan menggunakan beberapa bentuk sinyal, kemudian hasilnya akan dibandingkan dengan hasil yang dihitung dengan computer. Hasil uji coba menunjukkan bahwa metode ini dapat mampu memberikan akurasi pengukuran besarnya THD dari sebuah sinyal dengan baik.

scholarly journals THD performance of single phase five level inverter using proportional resonant and harmonic compensators current controller

2020 ◽  
Vol 11 (3) ◽  
pp. 1423
Author(s):  
Abdullahi Mohamed ◽  
Suriana Salimin
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Single Phase ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Harmonic Order ◽  
Matlab Simulink ◽  
Fast Fourier Transform Analysis ◽  
Current Controller

<span lang="EN-US">This paper observe the total harmonic distortion (THD) performance of single phase five level inverter using proportional resonant (PR) and harmonic compensators current controller. The THD when adding PR current controller was 1.6% at first. After more functions were added to the PR current controller to reduce the THD at the 3<sup>rd</sup>, 5<sup>th</sup> and 7<sup>th</sup> harmonic orders, the THD of the 3<sup>rd</sup> harmonic order was reduced from 0.45% to 0.1% while the 5<sup>th</sup> and 7<sup>th</sup> harmonic orders were reduced from 0.6% and 0.43% to 0.25% and 0.4% respectively. The development and simulation is performed using Matlab/Simulink. The simulation result is performed by using Fast Fourier Transform analysis (FFT) for the harmonics captured.</span>

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