Power Quality Improvement Using an Enhanced Network-Side-Shunt-Connected Dynamic Voltage Restorer

2015 ◽  
Vol 16 (5) ◽  
pp. 451-472 ◽  
Author(s):  
Alireza Fereidouni ◽  
Mohammad A. S. Masoum ◽  
Moayed Moghbel
Keyword(s):  
Poor Performance ◽  
Boost Converter ◽  
Voltage Sags ◽  
Harmonic Compensation ◽  
Dynamic Voltage Restorer ◽  
Load Voltage ◽  
Voltage Restorer ◽  
Three Phase ◽  
Dynamic Voltage ◽  
Zero Sequence

Abstract Among the four basic dynamic voltage restorer (DVR) topologies, the network-side shunt-connected DVR (NSSC-DVR) has a relatively poor performance and is investigated in this paper. A new configuration is proposed and implemented for NSSC-DVR to enhance its performance in compensating (un)symmetrical deep and long voltage sags and mitigate voltage harmonics. The enhanced NSSC-DVR model includes a three-phase half-bridge semi-controlled network-side-shunt-connected rectifier and a three-phase full-bridge series-connected inverter implemented with a back-to-back configuration through a bidirectional buck-boost converter. The network-side-shunt-connected rectifier is employed to inject/draw the required energy by NSSC-DVR to restore the load voltage to its pre-fault value under sag/swell conditions. The buck-boost converter is responsible for maintaining the DC-link voltage of the series-connected inverter at its designated value in order to improve the NSSC-DVR capability in compensating deep and long voltage sags/swells. The full-bridge series-connected inverter permits to compensate unbalance voltage sags containing zero-sequence component. The harmonic compensation of the load voltage is achieved by extracting harmonics from the distorted network voltage using an artificial neural network (ANN) method called adaptive linear neuron (Adaline) strategy. Detailed simulations are performed by SIMULINK/MATLAB software for six case studies to verify the highly robustness of the proposed NSSC-DVR model under various conditions.

scholarly journals Attenuation of Zero Sequence Voltage Using a Conventional Three-Wire Dynamic Voltage Restorer

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1247
Author(s):  
Rafael Neto ◽  
Yandi Landera ◽  
Francisco Neves ◽  
Helber de Souza ◽  
Marcelo Cavalcanti ◽  
...  
Keyword(s):  
Distribution Systems ◽  
Electric Energy ◽  
Voltage Sags ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Three Phase ◽  
Depth Study ◽  
Dynamic Voltage ◽  
Zero Sequence ◽  
Zero Sequence Voltage

Voltage sags/swells and harmonics are recurring problems in electric energy distribution systems. In order to solve these issues, several dynamic voltage restorer (DVR) topologies, such as the conventional three-wire DVR, have been proposed in the literature. Despite its capability of mitigating voltage disturbances, many researchers have established that conventional three-wire DVR cannot compensate for zero sequence voltage disturbances. In this paper, an in-depth study of the conventional three-phase DVR is presented, which shows that this DVR topology can also be used to attenuate zero sequence voltage components without increasing control complexity. The necessary conditions for this to occur are discussed in details and a brief comparison between the conventional three-wire DVR and other DVR topologies that can compensate for zero sequence voltage disturbances is made. Experimental results are included to validate the theoretical study.

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. 

scholarly journals Compansation of Electrical Voltage in Distribution System by Dynamic Voltage Restorer

2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Soe Soe Ei Aung ◽  
May Phone Thit
Keyword(s):  
Power Electronics ◽  
Power Quality ◽  
Distribution System ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Dynamic Voltage Restorer ◽  
Load Voltage ◽  
Electrical Voltage ◽  
Voltage Restorer ◽  
Dynamic Voltage

Electrical ac power systems consist of generation systems, transmission and distribution networks. The large three phase industrial loads at various distribution and transmission voltages as well as single-phase residential and commercial loads are supplied by the networks. Nowadays, the power quality such as voltage sags/swell, transient interrupts and harmonic distortions in sinusoidal waveforms are concerned with most of the electrical loads. The power quality problems such as voltage sags, swells and harmonics are caused by the widespread using of power electronics devices in power system. In this paper, electrical voltage sags/swells of power quality problems are considered because this problem is one of the most severe disturbances to the industrial equipment of distribution system. Thus, mitigation of these voltages in distribution system is necessary. So, series connected power electronics based device such as Dynamic Voltage Restorer (DVR) is chosen to compensate these voltage for mitigating quickly the voltage sag/swell in the system and restoring the load voltage to the nominal value. For case study, Myaungtagar industrial zone is chosen due to furnaces and large motor drives that cause the common problems such as voltage sag/swell in this system. In this paper, performance analysis of voltage sag/swell compensation of power distribution system with Dynamic Voltage Restorer (DVR) under various fault conditions is carried out. The proposed configuration model uses MATLAB/SIMULINK and the performance of voltage compensation and restoration of load voltage to the nominal value with DVR under various fault conditions is verified by the simulation results.

Study of Dynamic Voltage Restorer Based on Repetitive Control Algorithm

2013 ◽  
Vol 765-767 ◽  
pp. 2525-2528 ◽  
Author(s):  
Tian Yu Liu
Keyword(s):  
Control Strategy ◽  
Control Algorithm ◽  
Repetitive Control ◽  
Electric Power System ◽  
Voltage Sags ◽  
Dynamic Compensation ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Three Phase ◽  
Dynamic Voltage

This paper introduces a dynamic voltage restorer with independent three-phase structure, which is controlled on repetitive control strategy. Computer simulation of the whole repetitive control system is performed by Matlab/Simulink, and the results show that the effect of dynamic compensation can meet the request when voltage sags happened in electric power system.

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