scholarly journals An Improved Walsh Function Algorithm for Use in Sinusoidal and Nonsinusoidal Power Components Measurement

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Saifulnizam Bin Abdul Khalid ◽  
Garba Aliyu ◽  
Mohd Wazir Mustafa ◽  
Hussein Shareef
Keyword(s):  
Simple Algorithm ◽  
Walsh Function ◽  
Harmonic Load ◽  
Nonlinear Load ◽  
Linear Load ◽  
Alternative Approach ◽  
Three Phase ◽  
Ieee Standard ◽  
Linear And Nonlinear ◽  
High Level

This paper presents an improved Walsh function IWF algorithms as an alternative approach for active and reactive powers measurement in linear and nonlinear, balanced and unbalanced sinusoidal three-phase load system. It takes advantage of Walsh function unified approach, simple algorithm and its intrinsic high level of accuracy as a result of coefficient characteristics and energy behaviour representation. The developed algorithm was modeled on the Matlab Simulink software; different types of load, linear and nonlinear, were also modeled based on practical voltage and current waveforms and tested with the proposed improved Walsh algorithms. The IEEE standard 1459–2000 which is based on fast Fourier transform FFT approach was used as benchmark for the linear load system. The data obtained from laboratory experiment to determine power components in harmonic load systems using Fluke 435 power quality analyzer PQA which complies with IEC/EN61010-1-2001 standard was modeled and used to validate the improved algorithm for nonlinear load measurement. The results showed that the algorithm has the potential to effectively measure three-phase power components under different load conditions.

A New Improved Walsh Function Algorithm for Active and Reactive Power Measurement

2014 ◽  
Vol 67 (3) ◽  
Author(s):  
Garba Aliyu ◽  
Saifulnizam Abd. Khalid ◽  
Jafaru Usman ◽  
Ahmad Fuad A. Aziz ◽  
Hussein Shareef
Keyword(s):  
Reactive Power ◽  
Walsh Function ◽  
Power Measurement ◽  
Nonlinear Load ◽  
Active And Reactive Power ◽  
Linear Load ◽  
Alternative Approach ◽  
Three Phase ◽  
Linear And Nonlinear ◽  
High Level

This paper present improved Walsh function (IWF) algorithm as an alternative approach for active and reactive power measurement in linear and nonlinear, balanced and unbalanced sinusoidal three phase load system. It takes advantage of Walsh function unified approach and its intrinsic high level accuracy as a result of coefficient characteristics and energy behaviour representation. The developed algorithm was modeled on the Matlab Simulink software; different types of load, linear and nonlinear were also modeled based on practical voltage and current waveforms and tested with the proposed improved Walsh algorithm. The IEEE standard 1459-2000 which is based on fast Fourier transform FFT approach was used as benchmark for the linear load system while a laboratory experiment using Fluke 435 power quality analyzer PQA which complies with IEC/EN61010-1-2001standards was used to validate the improved algorithm for nonlinear load measurement. The results showed that the algorithm has the potential to effectively measure three phase power components under different load conditions.

scholarly journals Study of a Low-Cost Piezoelectric Sensor for Three Phase Induction Motor Load Estimation

Proceedings ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 46 ◽  
Author(s):  
Guilherme B. Lucas ◽  
Bruno A. de Castro ◽  
Marco A. Rocha ◽  
Andre L. Andreoli
Keyword(s):  
Mechanical Load ◽  
Low Cost ◽  
Failure Detection ◽  
Piezoelectric Sensor ◽  
Industrial Applications ◽  
Load Estimation ◽  
Alternative Approach ◽  
Three Phase ◽  
High Level ◽  
Induction Motor Load

Due the complexity of control and automation networks in modern industries, sensor-based systems stand out as effective approaches for failure detection in electrical and mechanical machines. This kind of intervention has a high operational value in industrial scenarios, once it can avoid corrective maintenance stops, i.e., before the failure reaches a high level of severity and compromises the machine. Consequently, the development of sensors applied to non-destructive techniques (NDT) for failure monitoring in electrical machines has become a recurrent theme in recent studies. In this context, this paper investigates the application of low-cost piezoelectric sensors for vibration analysis, which is an NDT that has already proved to be efficient for the detection of many structural anomalies in induction motors. Further, the proposed work presents a low-cost alternative approach for expensive commercial sensors, which will make this NDT more attractive for industrial applications. To describe the piezoelectric sensor frequency response, a pencil lead break (PLB) test was performed. After this validation, the Root Mean Square (RMS) value from the voltage samples obtained in the test bench was used as a signal processing method. A comparison between the results for different levels of mechanical load attached to the machine shaft indicated not only the successful performance of the low-cost sensors for load estimation purposes, but also showed that oversized motors may present higher vibration levels in some components that could cause mechanical wearing.

scholarly journals Performance analysis of LMS based control algorithm for power quality improvement in three phase grid connected system for linear/non-linear load

2019 ◽  
Vol 10 (4) ◽  
pp. 1944
Author(s):  
Mohmmad Ahmad ◽  
Sheeraz Kirmani
Keyword(s):  
Power Quality ◽  
Phase Distribution ◽  
Phase System ◽  
Least Mean Square ◽  
Inductive Load ◽  
Nonlinear Load ◽  
Linear Load ◽  
Three Phase ◽  
Non Linear ◽  
Non Linear Load

<p>This paper presents the adaptive filtering based least mean square control<br />algorithm for distribution static compensator (DSTATCOM) in three-phase<br />grid tied system for linear/non-linear load, to solve the power quality<br />problems caused by solid-state equipment and devices. This is shown that the<br />active component weights obtained from the load currents in the LMS<br />adaptive filter are used to produce the reference currents and subsequently<br />produces the switching pulses for VSC of the compensator. The complete<br />circuit along with the adaptive technique and diode bridge rectifier type nonlinear load is simulated in Matlab/Simulink software. Initially the circuit was<br />simulated for a three phase linear inductive load. Later it was simulated for a<br />rectifier load connected at PCC with a disconnection of the load of any phase<br />for a short duration of time. It is concluded that the harmonics are found<br />within the limit. The harmonics and power results for both types of loads are<br />compared in a tabular form. Hence this three phase system with<br />DSTATCOM improves the power quality in the three-phase distribution<br />network therefore, serves to provide harmonics reduction, load balancing and<br />regulating the terminal voltage at the point of common coupling (PCC).</p>

On Study of Harmonic Load Modeling for Equipment Power System

2014 ◽  
Vol 687-691 ◽  
pp. 3276-3280
Author(s):  
Zhi Yong Yin ◽  
Yong Guang Chen
Keyword(s):  
Power Systems ◽  
Power System ◽  
Simulation Analysis ◽  
Transient State ◽  
Internal Resistance ◽  
Harmonic Load ◽  
Security Assessment ◽  
Load Modeling ◽  
Nonlinear Load ◽  
Three Phase

It has been well recognized that the methods for electrical load modeling have significant impacts on the power systems operation, simulation, analysis and security assessment. Compared with the power grid of infinite capacity, the equipment power system with a large number of power electronic devices has larger internal resistance, and the application objects of the model face to the three-phase four-wire independent power supply system. Therefore, this paper deals with the problem of the three-phase four-wire harmonic load modeling in the equipment power system of infinite capacity, including the basic idea and principle of nonlinear load design, the main circuit structure of the chosen four-leg PWM converter, and the overall control strategy. Based on FFT analysis comparison between the real measured data and the simulation data, it is further shown that the load model can reproduce accurately the current waveform distortion, and simulate the harmonic characteristics of the steady state and transient state of equipment power system.

scholarly journals Performance Analysis of a Solar PV based Grid Tied Multilevel Inverter Scheme for Linear and Non Linear Load

2019 ◽  
Vol 8 (3) ◽  
pp. 400-405
Keyword(s):  
Multilevel Inverter ◽  
Solar Pv ◽  
Nonlinear Load ◽  
Grid Current ◽  
Linear Load ◽  
Point Of Common Coupling ◽  
Ieee Standard ◽  
Photo Voltaic ◽  
Common Coupling ◽  
Non Linear Load

This paper presents the performance of Solar Photo Voltaic (SPV) based grid connected multilevel inverter scheme having linear and nonlinear load connected at the Point of Common Coupling (PCC). Initially the analysis was carried out for the complete inverter circuit resulting in a slightly higher harmonics in PCC voltage and current, which can be further reduced to a lower value by connecting a filter. For a linear RL load, due to the filter, the THD in PCC voltage is reduced from 13% to below 5% (IEEE standard) and the THD in grid current decreases to below 5% from 14.8%. Similarly for a nonlinear load at PCC, a Diode Bridge, the harmonics in PCC voltage and the grid current can be further reduced to the lower level by connecting filter. The results obtained from simulation using SIMULINK/MATLAB Software are tabulated for SPV based grid tied system and also explained graphically.

scholarly journals Perancangan Kendali Multilevel Inverter Satu Fasa Tiga Tingkat dengan PI+feedforward pada Beban Nonlinier

2019 ◽  
Vol 7 (3) ◽  
pp. 493
Author(s):  
MOCHAMAD ARI BAGUS NUGROHO ◽  
NOVIE AYUB WINDARKO ◽  
BAMBANG SUMANTRI
Keyword(s):  
Control Method ◽  
Feedforward Control ◽  
Absolute Error ◽  
Power Converter ◽  
Pi Controller ◽  
Multilevel Inverter ◽  
Nonlinear Load ◽  
Linear Load ◽  
Linear And Nonlinear ◽  
Load Conditions

ABSTRAKSebuah konverter daya multilevel inverter diharapkan mampu untuk menyuplai tegangan AC ideal pada kondisi beban linier maupun nonlinier. Diharapkan metode kendali mampu cepat tanggap dan mampu mempertahankan bentuk tegangan AC keluaran inverter. Pengendali PI+feedforward diajukan dalam makalah ini. Pengendali ini akan diuji dengan beban linier maupun nonlinier. Beban nonlinier berupa rangkaian penyearah dengan filter kapasitor. Berdasarkan pengujian simulasi didapatkan bahwa pengendali PI+feedforward lebih cepat tanggap terhadap gangguan yang dibuktikan dengan nilai kesalahan rata-rata absolut sekitar 73% lebih kecil dari pengendali PI. Hasil Simulasi menunjukkan bahwa multilevel inverter dengan kendali PI menghasilkan THDv sebesar 0,669% pada beban linier dan sebesar 1,263% pada kondisi beban nonlinier. Sedangkan dengan kendali PI+feedforward menghasilkan THDv sebesar 0,292% pada beban linier dan sebesar 1,044% pada kondisi beban nonlinier.Kata kunci: mutilevel inverter, pengendali PI, feedforward, beban non-linier ABSTRACTA multilevel inverter power converter is expected to be able to supply ideal AC voltage in linear and nonlinear load conditions. It is expected that the control method is be able to respond quickly and be able to maintain the waveform of the inverter output AC voltage. PI + feedforward controller is proposed in this paper. This controller will be tested with linear and nonlinear loads. Nonlinear load is a rectifier circuit with a filter capacitor. Based on simulation it was found that PI + feedforward controllers were more responsive to interference as evidenced by the mean absolute error (MAE) value of about 73% less than the PI controller. Simulation results show that multilevel inverter with PI control produces THDv of 0.669% in linear load and 1.263% in nonlinear load conditions. Whereas with PI + feedforward control produces THDv of 0.292% in linear loads and of 1.044% in nonlinear load conditions.Keywords: multilevel inverter, PI controller, feedforward, non-linear load

scholarly journals Immersive Gesture Interfaces for Navigation of 3D Maps in HMD-Based Mobile Virtual Environments

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yea Som Lee ◽  
Bong-Soo Sohn
Keyword(s):  
Virtual Environments ◽  
User Study ◽  
Simple Algorithm ◽  
3D Models ◽  
Google Earth ◽  
Depth Camera ◽  
Immersive Virtual Reality ◽  
Head Mounted Displays ◽  
Gesture Interfaces ◽  
High Level

3D maps such as Google Earth and Apple Maps (3D mode), in which users can see and navigate in 3D models of real worlds, are widely available in current mobile and desktop environments. Users usually use a monitor for display and a keyboard/mouse for interaction. Head-mounted displays (HMDs) are currently attracting great attention from industry and consumers because they can provide an immersive virtual reality (VR) experience at an affordable cost. However, conventional keyboard and mouse interfaces decrease the level of immersion because the manipulation method does not resemble actual actions in reality, which often makes the traditional interface method inappropriate for the navigation of 3D maps in virtual environments. From this motivation, we design immersive gesture interfaces for the navigation of 3D maps which are suitable for HMD-based virtual environments. We also describe a simple algorithm to capture and recognize the gestures in real-time using a Kinect depth camera. We evaluated the usability of the proposed gesture interfaces and compared them with conventional keyboard and mouse-based interfaces. Results of the user study indicate that our gesture interfaces are preferable for obtaining a high level of immersion and fun in HMD-based virtual environments.

Linear and Nonlinear Control Techniques for a Three-Phase Three-Level NPC Boost Rectifier

2006 ◽  
Vol 53 (6) ◽  
pp. 1908-1918 ◽  
Author(s):  
Loubna Yacoubi ◽  
Kamal Al-Haddad ◽  
Louis-A. Dessaint ◽  
Farhat Fnaiech
Keyword(s):  
Nonlinear Control ◽  
Control Techniques ◽  
Three Phase ◽  
Linear And Nonlinear ◽  
Boost Rectifier

scholarly journals Power Quality and Enhancement Techniques: Research Gaps and Current Trends

2019 ◽  
Vol 9 (2) ◽  
pp. 1989-1995
Keyword(s):  
Power System ◽  
Power Quality ◽  
Nonlinear Load ◽  
Power Filters ◽  
Current Trends ◽  
Current State ◽  
Linear Load ◽  
Electrical Devices ◽  
Power Quality Improvement ◽  
Non Linear Load

The increased use of electricity-dependent devices has posed many concerns to the power industry. The devices like electric motors, printers, generators, transformers, computers, etc are widely used in today’s world. The electronic devices increase the non-linear load to the power system which leads to the power quality (PQ) issues by which the electrical devices may get affected with fluctuation causing equipment failure, power system failure, etc. In order to resolve the PQ related issues and harmonics mitigation occurred due to nonlinear load power filters were introduced in decades ago. This paper deals with the review of existing researches that uses power filters and other methods for power quality improvement. The paper also gives gaps and the current state of the art in the recent researches which have futuristic scope in the research domain.

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