scholarly journals Harmonics resonance elimination technique using active static compensation circuit

2021 ◽  
Vol 10 (5) ◽  
pp. 2405-2413
Author(s):  
Rakan Khalil Antar ◽  
Mohammed Y. Suliman ◽  
Asef A. Saleh
Keyword(s):  
Power System ◽  
Power Factor ◽  
Pulse Width Modulation ◽  
Supply Voltage ◽  
Resonance Effect ◽  
Harmonic Distortion ◽  
Resonance Problem ◽  
System Quality ◽  
Compensation Circuit ◽  
Nonlinear Load

The existence of nonlinear loads produces high distortion and low power factor in the power system that leads to get poor power quality. Resonance problem is occurred due to the power system inductances and the compensation capacitors which increases the harmonic distortion. Therefore, it is necessary to prevent the action of resonance even if conventional or modern methods are built to improve the power system quality. In this paper, active static compensation circuit is proposed and designed to have the features of improving power factor, reducing THD, and eliminating the harmonics resonance effect at the same time with different linear and nonlinear load conditions. These features have been performed based on a modified pulse width modulation technique to drive and control the proposed circuit. The originality designed point of this technique is to have ability to operate the active static compensation circuit as harmonics injector, power factor corrector and resonance eliminator at the same time. Simulation model results illustrate that the proposed circuit is effective for both steady-state and transient operations conditions. The THD of the supply voltage and current at firing angle (α=300) is reduced by 99% and 98.8% respectively. While the power factor is improved to stay around unity.

scholarly journals A Novel Single-Switch Single-Stage LED Driver with Power Factor Correction and Current Balancing Capability

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1340
Author(s):  
Yih-Her Yan ◽  
Hung-Liang Cheng ◽  
Chun-An Cheng ◽  
Yong-Nong Chang ◽  
Zong-Xun Wu
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width Modulation ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Boost Converter ◽  
Single Stage ◽  
Led Driver ◽  
Flyback Converter ◽  
High Power Factor

A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, a buck–boost converter and a current balance circuit. Only an active switch and a corresponding control circuit are used. The LED power can be adjusted by the control scheme of pulse–width modulation (PWM). The flyback converter performs the function of power factor correction (PFC), which is operated at discontinuous-current mode (DCM) to achieve unity power factor and low total current harmonic distortion (THDi). The buck–boost converter regulates the dc-link voltage to obtain smooth dc voltage for the LED. The current–balance circuit applies the principle of ampere-second balance of capacitors to obtain equal current in each LED string. The steady-state analyses for different operation modes is provided, and the mathematical equations for designing component parameters are conducted. Finally, a 90-W prototype circuit with three LED strings was built and tested. Experimental results show that the current in each LED string is indeed consistent. High power factor and low THDi can be achieved. LED power is regulated from 100% to 25% rated power. Satisfactory performance has proved the feasibility of this circuit.

Implementation of Single-Phase Two-Switch Midpoint Unidirectional Multilevel Converter System

2018 ◽  
Vol 19 (4) ◽  
Author(s):  
Peethala Rajiv Roy ◽  
P. Parthiban ◽  
B. Chitti Babu
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Low Voltage ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Open Loop ◽  
Current Control ◽  
Control Technique ◽  
Control Scheme

Abstract This paper deals with implementation of a single-phase three level converter system under low voltage condition. The frequency of the switches is made constant and involves change in ${t_{on}}$ and ${t_{off}}$ duration. For this condition the pulse width modulation control scheme for a single phase three level rectifier is developed to improve the power quality. The hysteresis current control technique is adopted to bring forth three-level PWM on the dc side of the bridge rectifier and to achieve high power factor and low harmonic distortion. Based on the proposed control scheme, the line current is driven to follow the sinusoidal current command which is in phase with the supply voltage. By using three-level voltage pattern the blocking voltage of each power device is clamped to half of the dc link voltage. The simulation and experimental results of 20W converter under low input voltage condition are shown to verify the circuit performance. Open loop simulation and hardware tests are implemented by applying a low voltage of 15 V(rms) on the input side.

scholarly journals Multivariable polynomial fitting of controlled single-phase nonlinear load of input current total harmonic distortion

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 137-142
Author(s):  
Roman Sikora ◽  
Przemysław Markiewicz ◽  
Wiesława Pabjańczyk
Keyword(s):  
Mathematical Model ◽  
Power Systems ◽  
Single Phase ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Polynomial Fitting ◽  
Nonlinear Load ◽  
Multivariable Polynomial ◽  
Led Luminaire

Abstract The power systems usually include a number of nonlinear receivers. Nonlinear receivers are the source of disturbances generated to the power system in the form of higher harmonics. The level of these disturbances describes the total harmonic distortion coefficient THD. Its value depends on many factors. One of them are the deformation and change in RMS value of supply voltage. A modern LED luminaire is a nonlinear receiver as well. The paper presents the results of the analysis of the influence of change in RMS value of supply voltage and the level of dimming of the tested luminaire on the value of the current THD. The analysis was made using a mathematical model based on multivariable polynomial fitting.

scholarly journals Performance of Three Level H-Bridge Inverter in Grid Connected Solar PV for Multifunctional Operations using Different Control Techniques

2020 ◽  
Vol 9 (4) ◽  
pp. 1942-1950
Keyword(s):  
Power System ◽  
Power Factor ◽  
Reactive Power ◽  
Power Factor Correction ◽  
Solar Pv ◽  
Distribution Grid ◽  
Nonlinear Loads ◽  
Nonlinear Load ◽  
Control Techniques ◽  
Active And Reactive Power

This paper presents multifunctional operation capability of three level cascade H bridge inverter for grid connected solar pv application. The solar panel and inverter are modelled for unbalance and nonlinear loads with three control techniques (pq,dq,cpt) and its performance is simulated in the MATLAB environment using SIMULINK and Sim Power System (SPS) toolboxes. The performance of inverter is evaluated for harmonics elimination, power factor correction apart from active and reactive power support to grid and nonlinear load .Performance of three level H bridge inverter is evaluated for both PV mode and STATCOM mode using three control techniques for distribution grid.

Hardware Implementation of Single Phase Power Factor Correction System using Micro-controller

2016 ◽  
Vol 7 (3) ◽  
pp. 790
Author(s):  
Kartikesh Kumar Jha ◽  
Bidyut Mahato ◽  
Prem Prakash ◽  
Kartick Chandra Jana
Keyword(s):  
Power Systems ◽  
Power Factor ◽  
Pulse Width Modulation ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Root Cause ◽  
Modulation Techniques ◽  
Power Switches ◽  
Controller Board ◽  
Correction System

Rapid increase of consumers in electronics devices and the use of mains rectification circuits inside these electronic devices is the root cause of mains harmonic distortion. Automatic power factor correction techniques can be applied to the industries, power systems and households to make them stable inturns increases the efficiency of system as well as the apparatus. This paper deals with the hardware design of active power factor correction circuit employing boost converter which is used to boost the DC voltages with a controller based on PID control strategy. The pulses given to power switches by pulse width modulation techniques generated by utilizing micro-controller board, Arduino thus obviating the need of complex hardware circuitry. MATLAB/SIMULINK was used to design and tune the PID controller parameters. The simulation results are matching with the predictions and the same was implemented as hardware. The waveforms various test points and across capacitors were obtained, studied and compared with the theoretical waveforms and are found to be in precise proximity of theoretical waveforms.

scholarly journals Detailed Simulink implementation for induction motor control based on space vector pulse width modulation SVPWM

2021 ◽  
Vol 22 (3) ◽  
pp. 1251
Author(s):  
Taha A. Hussein ◽  
Laith A. Mohammed
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Supply Voltage ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Distortion ◽  
Open Loop ◽  
Open Loop Control ◽  
Space Vector ◽  
Loop Control ◽  
Sinusoidal Pulse Width Modulation

Space vector pulse width modulation (SVPWM) generates less harmonic distortion in the output voltage or currents, provides more efficient use of supply voltage and better voltage utilization compared with sine pulse width modulation (PWM). In this work, a detailed Simulink implementation for SVPWM for the open loop control of permanent magnet synchronous motor (PMSM) is presented. Results show the output of the blocks that assembles SVPWM besides the PMSM voltages and currents when exposing the motor to different load torques. The technique of SVPWM enables the load to respond to the change in external load torque. This technique also results in lower total harmonic distortion and better utilization of the direct current (DC) supply compared with traditional sinusoidal pulse width modulation sinusoidal pulse width modulation (SPWM).

scholarly journals Report on Power Compensation and Total Harmonic Distortion level Analysis

2016 ◽  
Vol 6 (6) ◽  
pp. 2577
Author(s):  
Nikita Ramesh Kalaskar ◽  
Rajesh Holmukhe
Keyword(s):  
Power Factor ◽  
Distribution System ◽  
High Speed ◽  
Harmonic Distortion ◽  
Electrical Equipment ◽  
Nonlinear Load ◽  
Distortion Level ◽  
Linear Load ◽  
Non Linear ◽  
Non Linear Load

<p>In the chart of Indian science based industry, pharmaceutical industry is on top position. So it<em> </em>is essential to fulfil such critical requirement or demand, production should be with high speed. For such high production, using of software based machineries, electronic circuits are been used. By using such electronic based equipment’s and machineries, it is obvious day by day increasing non-linear load of the industry which lead to lagging power factor. In electric system nonlinear load with low power factor draws more current from source. So because of such high current drawn, life of switchgear, wire and other electrical equipment decreases. So due to large equipment and wasted energy, the electrical utilities company usually charge a higher cost to industrial customer for the constant logging power factor. To improving the lagging power factor, industry may prefer to install capacitor bank in series. But installation of capacitor power bank leads to the increment of total harmonics distortion level. In common plant, containing power factor correction capacitor, It is been seen that normal resonant frequency falls normally in the range of 5<sup>th</sup> to 13<sup>th</sup> harmonics. So this non-linear load leads to inject current at 5<sup>th</sup>, 7<sup>th</sup>, 11<sup>th</sup> and 13<sup>th</sup> harmonics. It will usually result on producing the problems with switchgears, damaged capacitor banks and failure to the electrical distribution system.</p>

scholarly journals Designing of SPVWM Inverter Controlled System By Using Suitable Architecture Of Power Quality Enhancement Device For Driving Mixed Loads

2020 ◽  
Vol 6 (1) ◽  
pp. 9
Author(s):  
Rakesh Kumar ◽  
Mr Anurage Khare
Keyword(s):  
Power System ◽  
Power Quality ◽  
Power Supply ◽  
Pulse Width Modulation ◽  
Reactive Power ◽  
Quality Enhancement ◽  
Nonlinear Load ◽  
Different Types ◽  
Unbalanced Load ◽  
The Stability

The stability of a power system is the ability of a power system to restore an operating state of equilibrium for a given initial operating condition after it has been subjected to a physical disturbance, most of the variables of the system being limited so that almost the entire system remains intact. Designing of a SPVWM controlled inverter that has to be made available for efficient power supply to the load of different types. The control of inverter has to be designed in order to enhance the system power supply. To achieve this a space vector pulse width modulation technique has been designed which is then used to provide pulses to the three leg inverter. To design a power quality enhancement device with a simplified architecture such that it will accommodate for the reactive power supply along with an improvement in the active power available at the load terminals. Thus it can be drawn from this work that while designing an inverter with SPVWM control strategy the proposed power quality enhancement device can serve the purpose with better results in terms of power and efficiency. This architecture can also be used in hybrid systems thus making it more reliable controlling method. The system designed is also fitted to feed different types of load like nonlinear load, balanced load and unbalanced load.

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