Performance Analysis of DVR Using ANN Controller for Voltage Quality Enhancement

2014 ◽  
Vol 573 ◽  
pp. 356-361 ◽  
Author(s):  
P. Sathish Babu ◽  
N. Kamaraj
Keyword(s):  
Harmonic Distortion ◽  
Voltage Sag ◽  
Simulation Studies ◽  
Dynamic Voltage Restorer ◽  
Voltage Quality ◽  
Linear Load ◽  
Voltage Restorer ◽  
Three Phase ◽  
Dynamic Voltage ◽  
Non Linear Load

This paper presents a Dynamic Voltage Restorer to mitigate power quality disturbances such as voltage sag, swell and harmonics. The compensation strategy is based on pre-sag compensation. Controller based on dq0 transformation technique and ANN is implemented in order to maintain the nominal load voltage and phase angle. Simulation studies under three phase rectifier with parallel resistive/capacitive dc load as a non linear load is carried out. Also the system is investigated under voltage sag and swells on source side using programmable AC source. Simulation results show that DVR performs accurately in mitigating disturbances with minimum Total Harmonic Distortion. The performance of DVR is verified using Matlab / Simulink Environment.

Operation and Control of a DVR in the Presence of Interharmonics

2008 ◽  
Vol 9 (1) ◽  
Author(s):  
Amit Kumar Jindal ◽  
Arindam Ghosh ◽  
Avinash Joshi
Keyword(s):  
Supply Voltage ◽  
Voltage Sag ◽  
Simulation Studies ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Three Phase ◽  
Sequence Components ◽  
Dynamic Voltage ◽  
Computer Simulation Studies ◽  
And Control

The paper discusses the operating principles and control characteristics of a dynamic voltage restorer (DVR). It is assumed that the source voltages contain interharmonic components in addition to fundamental components. The main aim of the DVR is to produce a set of clean balanced sinusoidal voltages across the load terminals irrespective of unbalance, distortion and voltage sag/swell in the supply voltage. An algorithm has been discussed for extracting fundamental phasor sequence components from the samples of three-phase voltages or current waveforms having integer harmonics and interharmonics. The DVR operation based on extracted components is demonstrated. The switching signal is generated using a deadbeat controller. It has been shown that the DVR is able to compensate these interharmonic components such that the load voltages are perfectly regulated. The DVR operation under deep voltage sag is also discussed. The proposed DVR operation is verified through the computer simulation studies using the MATLAB software package.

scholarly journals Voltage Compensation Using Dvr with Modified Switching Band Control

2018 ◽  
Vol 7 (4.24) ◽  
pp. 53
Author(s):  
Sura.Srinivasa Rao ◽  
Choppavarapu.Sai Babu
Keyword(s):  
Switching Frequency ◽  
Simulation Studies ◽  
Dynamic Voltage Restorer ◽  
Switching Losses ◽  
Voltage Restorer ◽  
Three Phase ◽  
Voltage Compensation ◽  
Point Of Common Coupling ◽  
Dynamic Voltage ◽  
Common Coupling

This paper presents mitigation of voltage related Power Quality (PQ) issues by using Dynamic Voltage Restorer (DVR). Three phase four wire DVR with modified switching band controller is proposed. A modified filter circuit band controller is proposed for reducing the switching losses, constant switching frequency maintenance and corresponding simulation studies are carried out. Variable hysteresis band (modified band) controller generates accurate injected voltages by using system parameters and low error value between reference injected voltages, actual injected voltages can be achieved, which helps in smoothening and minimizing ripples in PCC (Point of common coupling) voltages. The obtained simulation results are presented.

scholarly journals Contemporary Control of DG Integrated DVR for Sag, Swell and Harmonic Mitigation

2018 ◽  
Vol 8 (5) ◽  
pp. 2721
Author(s):  
Syed Suraya ◽  
P. Sujatha ◽  
P. Bharat Kumar
Keyword(s):  
Control Strategy ◽  
Voltage Source ◽  
Voltage Sag ◽  
Voltage Source Converter ◽  
Voltage Profile ◽  
Pv System ◽  
Dynamic Voltage Restorer ◽  
Voltage Quality ◽  
Voltage Restorer ◽  
Dynamic Voltage

This paper presents a novel control strategy to control DG integrated DVR (dynamic voltage restorer) for mitigation voltage quality problems. Power quality is the most concerning areas in power engineering and voltage quality is of prime focus. Voltage sag, voltage swell and harmonics in voltage causes deterioration in quality of voltage delivered to load. A minor disturbance in voltage profile can degrade the performance of load. Dynamic voltage restorer is a quick responsive custom power device for voltage quality improvement. Photovoltaic (PV) system is considered as DG and output voltage of PV system is boosted with a boost converter to support voltage source converter of DVR. DG integrated DVR with novel control strategy for mitigation of voltage sag, swell and voltage harmonic is presented in this paper. The power system model with DG integrated DVR is developed and results are obtained using MATLAB/SIMULINK. Results are discussed during pre and post sag/swell condition with compensation and THD in voltage is maintained within nominal values.

scholarly journals Improved Analysis of DVR Performance for Voltage Sag Mitigation

2018 ◽  
Vol 17 (3) ◽  
pp. 36-40
Author(s):  
Hannah Naqiah Abdul Razak ◽  
Dalila Mat Said ◽  
Nasarudin Ahmad
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Load Condition ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Dynamic Voltage Restorer ◽  
Power Distribution System ◽  
Voltage Restorer ◽  
Three Phase ◽  
Dynamic Voltage

Dynamic Voltage Restorer (DVR) provides the most reliable solution to the voltage quality problem in power distribution system from the effectiveness of DVR performance for voltage sag mitigation. As a custom power device, DVR offers the best solution to three phase power system in order to improve the power quality issue as the magnitude and phase of the voltage is added during the sags occurrence to restore the load condition to compensate the voltage sags. The suitable controller, Proportional-Integral (PI) Controller is used along with the Pulse Width Modulation (PWM)-based control scheme to calculate the exact error and generate the missing voltage to be injected to the three-phase power system through injection transformers. Simulation results of various fault types using MATLAB/SIMULINK are shown in this paper to demonstrate the successful compensation of voltage sags by mitigation technique using Dynamic Voltage Restorer in three-phase power distribution. 

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