scholarly journals Development of Multilevel Cascaded H-bridge Inverter Based Dynamic Voltage Restorer (DVR)

2019 ◽  
Vol 8 (12) ◽  
pp. 146-149
Keyword(s):  
Control Method ◽  
Estimation Method ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Three Phase ◽  
Control Scheme ◽  
Energy Compensation ◽  
Dynamic Voltage ◽  
And Control ◽  
Custom Power

The objective of this study is to present the development of a dynamic voltage restorer (DVR) which employs a cascaded H-bridge multilevel inverter. DVR is a power electronic converter based on custom power device used to compensate for voltage variations. DVR does not need active energy storage systems like batteries as the zero energy compensation method is used. The control system may lead to challenges as compared with other DVR systems. To overcome this challenge a control method is used. In addition to minimize the delay of DVR and to mitigate the voltage sags, a three phase estimation method is used. The estimation method and control scheme is performed by using MATLAB/SIMULINK.

scholarly journals MSRF Control Based Interline Dynamic Voltage Restoration in Distribution Line

2020 ◽  
Vol 8 (5) ◽  
pp. 2953-2957
Keyword(s):  
Control Method ◽  
Settling Time ◽  
Voltage Sag ◽  
Dynamic Voltage Restorer ◽  
Synchronous Reference Frame ◽  
Voltage Variation ◽  
Voltage Restorer ◽  
Three Phase ◽  
Dynamic Voltage ◽  
Distribution Station

This paper deals with the implementation of interline dynamic voltage restorer (IDVR) system using three-phase inverter integrated with PLL based MSRF controller for regulating the DC link voltage, and reducing the voltage sag. Voltage variation that frequently occurs either in the form of voltage sag or swells and it can cause major damage to the environment and distribution station. In this paper, interline dynamic voltage restorer has proposed which consist of more than one DVR's are commonly connected with the DC link capacitor of the system. Suitable control methods are developed for reduce the voltage sag in the line. Modified synchronous reference frame control has designed and implemented for both controls, and compensation of voltage sag. Conventional control method has some constraints such as high settling time of dc link voltage, and increase in harmonics that could be overcome by a new approach of MSRF based PLL has presented in this paper, which helps to compensate the voltage sag occurs in the system. Furthermore design and analysis of MSRF based IDVR is proposed to improve the efficiency, reducing the settling time of DC link voltage, reducing the harmonics distortion, and minimize the power quality issues by using MATLAB/SIMULINK.

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.

Design of Z-Source Inverter-Based Dynamic Voltage Restorer Circuitry with R-SOGI Control Scheme for Enrichment of Power Quality

2021 ◽  
pp. 2150195
Author(s):  
A. Sathik Basha ◽  
M. Ramasamy
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Voltage Sag ◽  
Nonlinear Loads ◽  
Dynamic Voltage Restorer ◽  
Power Distribution System ◽  
Voltage Restorer ◽  
Control Scheme ◽  
Dynamic Voltage

Increased utilization of nonlinear loads in the power distribution system with profound integration of renewable energy requires improved power quality control. This paper proposes a Reformed Second Order Generalized Integrated (R-SOGI) control scheme for enhancing the output of the Dynamic Voltage Restorer (DVR) for the objective of achieving the desired sinusoidal voltage wave shape at the common point of services and harmonic reduction. The DVR incorporates a Solar Photovoltaic (SPV) system using the Z-source Inverter (ZSI), providing the necessary active power to mitigate the voltage sag/swell and power demand. ZSI offers step-down as well as step-up abilities, it makes the converters to operate in the conditions of shoot-through. Therefore, the application of ZSI-based DVR topology seems very promising. The compensating reference voltage is generated by the R-SOGI algorithm, which offers superior output under conditions for grid voltage irregularities, including voltage sag/swell and unbalanced and distorted utility grid voltages. In comparison to DVR based on the VSI voltage inverter (VSI), the response from ZSI-DVR to a reduction of voltage distortions and harmonics is investigated. An experimental SPV ZSI-DVR prototype is developed in the laboratory to check the effectiveness of the controller and is tested under balanced and unbalanced supply and dynamic load conditions.

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