scholarly journals Voltage Oriented Control(VOC) Of The PWM Rectifier Using Active Filtering Function

2018 ◽  
Vol 7 (2.19) ◽  
pp. 90
Author(s):  
S Md.Mazhar-Ul-Haq ◽  
Dr S.S.Tulasi Ram ◽  
Dr JBV.Subramanyam
Keyword(s):  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Theoretical Concept ◽  
Unity Power Factor ◽  
Bidirectional Converter ◽  
Boost Rectifier ◽  
Active Filtering ◽  
Filtering Function ◽  
Grid Side

Pulse width modulation rectifier has gathered its demand during the recent years for modification needs of the ac-dc conversion systems need for industries, customer and power grid sectors. This bidirectional converter can act as ac to dc boost rectifier with near unity power factor at the grid side along with the regulated and ripple free output voltage at the dc side. This paper deals with the evaluation of control strategy called voltage oriented control with active filtering function, Total harmonic distortion (THD),dynamic performance and parameter sensitivity is studied theoretical concept is provided and results of computer simulations are given by using mat lab. 

scholarly journals On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters

2021 ◽  
Author(s):  
Alon Kuperman
Keyword(s):  
Power Factor ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Loop Gain ◽  
Unity Power Factor ◽  
Trade Off ◽  
Loop Bandwidth ◽  
Grid Connected Converters ◽  
Grid Side ◽  
Double Grid

<p>It is well-known that attainable DC link voltage loop bandwidth in grid-connected converters operating with unity power factor is limited due to trade-off with AC-side current total harmonic distortion (THD). The letter reveals that THD requirement directly imposes the value of voltage loop gain magnitude at double-grid frequency; therefore the dynamic performance may be improved without deteriorating the grid-side current quality by modifying the controller structure such that the loop gain magnitude at double-grid frequency and the crossover frequency are decoupled. Experimental results validate the revealed findings.</p>

scholarly journals On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters

2021 ◽  
Author(s):  
Alon Kuperman
Keyword(s):  
Power Factor ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Loop Gain ◽  
Unity Power Factor ◽  
Trade Off ◽  
Loop Bandwidth ◽  
Grid Connected Converters ◽  
Grid Side ◽  
Double Grid

<p>It is well-known that attainable DC link voltage loop bandwidth in grid-connected converters operating with unity power factor is limited due to trade-off with AC-side current total harmonic distortion (THD). The letter reveals that THD requirement directly imposes the value of voltage loop gain magnitude at double-grid frequency; therefore the dynamic performance may be improved without deteriorating the grid-side current quality by modifying the controller structure such that the loop gain magnitude at double-grid frequency and the crossover frequency are decoupled. Experimental results validate the revealed findings.</p>

Harmonic Analyses of Power Grid in Large-Capacity Groups of AC-DC-AC Frequency Speed Drag System

2013 ◽  
Vol 448-453 ◽  
pp. 1988-1993
Author(s):  
Ji Zhong Wang ◽  
Chao Nan Tong ◽  
Rui Li
Keyword(s):  
Power Supply ◽  
Pulse Width Modulation ◽  
Reactive Power ◽  
Power Grid ◽  
Harmonic Distortion ◽  
Power Load ◽  
Grid Side ◽  
Lc Filter ◽  
Harmonic Analyses ◽  
The Impact

Based on the synchronous machine in AC-DC-AC Frequency speed drag System, a new power supply method of phase shifting combination is proposed by a detailed study of the impact in the power grid harmonics. With regard to the main Motor drive system of hot-rolling finishing mills, a large number of varying parameters quantitative analysis is made respectively for power load, LC filter, pulse-width modulation circuit and transformer, in which the grid side harmonic rate and waveform distortion rate is focused on. The simulation results show that the power supply method with reasonable parameters design of the drag system can be drastically reduce the grid side harmonic interference that the total harmonic distortion is suppressed within 4.0%. Results of this study provides an effective method for the design of the factory drag system, reactive power compensation system as well as fault diagnosis of electric drag system.

scholarly journals Pengoptimalan Kinerja Pengereman Regeneratif Motor BLDC menggunakan Cascaded Boost Converter

2021 ◽  
Vol 9 (2) ◽  
pp. 444
Author(s):  
DANIEL RAHADIAN FIRMANTO ◽  
SLAMET RIYADI ◽  
LEONARDUS HERU PRATOMO ◽  
FLORENTINUS BUDI SETIAWAN
Keyword(s):  
Electric Vehicle ◽  
Experimental Work ◽  
Duty Cycle ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
High Gain ◽  
Regenerative Braking ◽  
Bidirectional Converter ◽  
High Torque ◽  
Boost Rectifier

ABSTRAKMesin Brushless Dircet Current (BLDC) digunakan pada kendaraan listrik karena memiliki torsi yang besar dan memungkinkan untuk pengereman regeneratif. Pengereman regeneratif dirancang agar kendaraan listrik memiliki jarak tempuh yang lebih panjang. Pada saat pengereman, konverter bidirectional dioperasikan menjadi boost rectifier agar energi dapat berpindah ke baterai. Boost rectifier memiliki gain yang rendah, sehingga pengiriman daya ke baterai kurang optimal. Pada penelitian ini ditambahkan chopper kedua yang memiliki gain tinggi agar pengiriman daya lebih optimal. Metode modulasi lebar pulsa yang dibangkitkan mikrokontrol dsPIC30f4012 digunakan untuk mengendalikan saklar (IRFP 460) pada konverter. Verifikasi menggunakan perangkat keras telah dilakukan untuk mendukung penelitian ini. Hasil percobaan pada duty cycle 0,8 dapat dihasilkan arus pada baterai sebesar 0,25 A dan kecepatan berkurang menjadi 663 rpm.Kata kunci: BLDC, Pengereman regeneratif, Boost rectifier, chopper, dsPIC30f4012 ABSTRACTBrushless direct current (BLDC) machine is suitable to be implemented in electric vehicle since it can provide high torque and is capable to do regenerative braking. For electric vehicle applications, the regenerative braking is needed to make such vehicle can travel longer distance. For making the machine current can flow into the battery, the bidirectional converter will be operated as a boost rectifier. The boost rectifier produced a low gain so that the second chopper with a high gain is required. The pulse width modulation (PWM) method was used to control each switch (IRFP 460) using a dsPIC30F4012 microcontroller. A verification with experimental work was done. Based on the result, with 0.8 duty cycle can produced a 0.2 A battery current also and speed reduced to 663 rpm.Keywords: BLDC, Regenerative braking, Boost rectifier, chopper, dsPIC30f4012

Active Filtering Function of Three-Phase PWM Boost Rectifier Under Different Line Voltage Conditions

2005 ◽  
Vol 52 (2) ◽  
pp. 410-419 ◽  
Author(s):  
M. Cichowlas ◽  
M. Malinowski ◽  
M.P. Kazmierkowski ◽  
D.L. Sobczuk ◽  
P. Rodriguez ◽  
...  
Keyword(s):  
Line Voltage ◽  
Three Phase ◽  
Boost Rectifier ◽  
Active Filtering ◽  
Filtering Function

Power Control for a Wind Power Generation from SCIG and Harmonic Current Filtering

2020 ◽  
Author(s):  
Ângelo Marcílio M. dos Santos ◽  
Vanessa Siqueira de C. Teixeira ◽  
Ricardo Parcelle C. Pacífico ◽  
Leonardo P. S. Silva ◽  
Marcos Vinícius S. França ◽  
...  
Keyword(s):  
Power Generation ◽  
Power Control ◽  
Wind Power ◽  
Active Power ◽  
Wind Power Generation ◽  
Induction Generator ◽  
Harmonic Compensation ◽  
Active Filtering ◽  
Filtering Function ◽  
Grid Side

The main contribution of this paper is to present a proposal for the development of an active power filter (APF) for a wind power generation system connected to the electric grid, using the three-phase induction generator with squirrel cage rotor (SCIG). In the induction generator side converter (IGSC) the power control is done by the magnetizing current and electromagnetic torque in coordinates dq. Thus, the wind system controls the active and reactive powers, as well as performing the active filtering function in the grid currents. Harmonic compensation is performed by an algorithm applied to the grid side converter (GSC). That technique improves the power quality and keeps the voltage at DC bus. The studied system was mathematically modeled and simulated using the Matlab / Simulink software. When SCIG provides 2 kW of active power, the THD from 18,94% (without APF) was reduced to 3,93% for GSC operating with APF function.

AN EXPERIMENTAL ANALYSIS OF THE RANDOMIZED PWM IN THE BOOST RECTIFIER

2004 ◽  
Vol 13 (04) ◽  
pp. 761-770
Author(s):  
FRANC MIHALIC ◽  
MIRO MILANOVIC
Keyword(s):  
Power Factor ◽  
Experimental Analysis ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Input Current ◽  
Frequency Range ◽  
Spectrum Density ◽  
Boost Rectifier

Several recommendations and standards have increased the interest in power factor correction circuits. There are multiple solutions in which line current is sinusoidal and boost rectifier is one of them. In this paper an experimental analysis of the randomized pulse width modulation (RPWM) algorithm in the boost rectifier is performed. The influence of randomization is followed: first, introduction of the RPWM switching is reflected in smaller increase of the total harmonic distortion (THD) factor in the input current. Nevertheless, decrease of the power factor is negligibly small. Second, power spectrum density (PSD) of the input current is estimated and measured to evaluate the influence of the randomization in the high frequency range. Based on this approach, lower conductive electromagnetic interference (EMI) is expected and also experimentally verified.

scholarly journals Harmonics Reduction using a Modified Controller for Doubly Fed Induction Generator

2021 ◽  
Vol 9 (5) ◽  
pp. 45-50
Author(s):  
Ahmed Hassan Adel ◽  
Salama Abo-Zaid ◽  
Mahmoud Elwany
Keyword(s):  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Simulink Model ◽  
Simulation Results ◽  
Doubly Fed ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter

This paper discusses a control system for the converter of doubly fed induction generator (DFIG) driven by wind energy. The converter of DFIG consists of two main parts; rotor side converter (RSC) and grid side converter (GSC). Two advanced control methods for GSC are presented here in this paper; vector control strategy based on pulse width modulation (PWM) and direct power control (DPC). DPC is based on switching table for voltage vector selection. In addition to grid voltage position, direct and quadrature current components are used here as inputs to the switching table instead of active and reactive powers respectively. This paper proposes a modified switching table for DPC to reduce ripples and total harmonic distortion (THD) of current produced by GSC. A Simulink model for 9 MW wind system based on DFIG is given in this paper. Simulation results are given for PWM, DPC and Proposed system for GSC. In view of THD calculations and simulation results a comparative study and conclusion are given in the end of this paper.

scholarly journals Analysis of direct power control AC-DC converter under unbalance voltage supply for steady-state and dynamic response

2020 ◽  
Vol 10 (4) ◽  
pp. 3333
Author(s):  
Nor Azizah Mohd Yusoff ◽  
Azziddin M. Razali ◽  
Kasrul Abdul Karim ◽  
Raja Nor Firdaus Kashfi Raja Othman ◽  
Auzani Jidin ◽  
...  
Keyword(s):  
Steady State ◽  
Power Control ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Voltage Source ◽  
Phase System ◽  
Direct Power ◽  
Direct Power Control ◽  
Three Phase

This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.

Study of Hoist Control System Based on Dual Three-Level Inverter

2014 ◽  
Vol 577 ◽  
pp. 368-371
Author(s):  
Feng Wang ◽  
Shu Yun Qiao ◽  
Xu Long Zhang
Keyword(s):  
Control System ◽  
Power Factor ◽  
Control Method ◽  
Dynamic Performance ◽  
Power Saving ◽  
Power Converter ◽  
Unity Power Factor ◽  
Energy Flows ◽  
Stator Flux ◽  
Grid Side

The double-fed control strategy for AC hoist motor is discussed in this paper. The AC/DC/AC power converter is adopted as main circuit. Three-phase neutral-point-clamped three-level rectifier is used as AC/DC link to realize unity power factor at grid-side, which reduces harmonic distortions. For the DC/AC inverter, three-level topology is used, which is controlled by stator-flux oriented vector control method. Meanwhile, energy flows in bidirectional way by back to back three-level power converter. The hoist motor control system obtains a high dynamic performance when stator side operating in unity power factor condition. The reliability and safety of hoist system is improved based on double PLC. The control system mentioned in this paper is being used to control a shaft hoist with a capacity of 260kW, and the power saving is remarkable.

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