Simulation Of Dynamic Voltage Restorer Research Articles

Power quality enhancement by using Z-DVR based series voltage compensation with black widow optimization technique

In distribution system, voltage quality issues are the most concerning disturbances influencing the power quality (PQ). As a result, to alleviate this PQ concerns such as sag, swell, fluctuation, interruption, and harmonics on the sensitive load, the series voltage compensator dynamic voltage restorer (DVR) is utilized. Furthermore, a Z-source inverter (ZSI) based DVR is proposed in this paper to improve the power system's voltage restoration properties. To compensate the voltage concerns which is occurs in passive and transmission components, the 3-φ Z-DVR inverter with proportional integral derivative (PID) controller tuned by black widow optimization (BWO). By short circuiting the legs of inverter in the ZSI, prepare the possibility of buck and boost in voltage and utilize the LC impedance grid which incorporated power source to inverter circuit. In addition, to obtain the injecting voltage, PID control scheme for ZSI based DVR is proposed in this paper. The proposed modelling and simulation of DVR is implemented in MATLAB/Simulink tool and the outcomes are analyzed. Furthermore, reduction in voltage concerns, and total harmonics distribution (THD) with BWO tuned PID controller is superior which is 1.01% when compared with existing methods such as Harris Hawks optimization (HHO) based PID, genetic algorithm (GA) based PID controller.

Modeling and Simulation of DVR and D-STATCOM in Presence of Wind Energy System

The present study suggests that series voltage injection is more effective than parallel current injection to improve voltage quality on the load side. The line voltage can be accurately symmetrized at the connection point by creating and controlling a series voltage component in each phase. This is more reliable and effective than parallel current injection. A dynamic voltage restorer (DVR) and a distribution static synchronous compensator (DSTATCOM) were utilized to provide the required power. The DVR is an effective and modern device utilized in parallel within the grid and can protect sensitive loads from voltage problems in the grid by injecting voltage. The DVR and D-STATCOM were used to improve voltage stability in faults. A standard 13-bus system was studied in the presence of a wind farm. The simulation results demonstrated that single and three-phase overloads dramatically altered the voltage of the system, making it necessary to use compensators to improve voltage stability. The DVR and D-STATCOM showed similar performance under normal conditions and somewhat improved grid voltage unbalance. However, the DVR outperformed D-STATCOM under asymmetric faults conditions and led to lower voltage variations.

Design and simulation of dynamic voltage restorer (DVR) for power quality improvement

Power quality (PQ) is one of the main issues faced in the present era. The PQ issues such as voltage sags, swells, harmonics, and unbalance as well as the impact on sensitive loads are often occurred in any power distribution system. To tackle the issues, a powerful dynamic voltage restorer (DVR) is commonly installed. However, the existing control algorithms for DVR are found to be complex, potentially increases computational burden to the controller. Therefore, in this paper, a new simplified control algorithm which utilizes the strengths of synchronous rotating frame (SRF) and phase-locked loop (PLL) concepts, is proposed to better manage operation of DVR. The DVR system is modelled and simulated by using MATLAB/Simulink platform. Performance of the newly proposed algorithm for DVR is tested in three-phase system with voltage sags, swells, harmonics and unbalances conditions. From the findings, it can be concluded that the proposed algorithm for DVR which installed in a three-phase power distribution system effectively mitigated the voltage sags, swells and unbalances conditions and, for harmonics condition, it is found to be able to minimize and contain the harmonic contents within the acceptable level.

Modelling and Simulation of Dynamic Voltage Restorer in Power System

Abstract: Recently, Power quality is one of major concerns in the present era. It has become important, especially, with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply. To improve the power quality, custom power devices are used. The device considered in this work is Dynamic Voltage Restorer. Thispresents modelling, analysis and simulation of a Dynamic Voltage Restorer (DVR) constructed in Simulink environment. Here, different supply voltage conditions are considered for linear loads. The major problems dealt here are voltage sag, voltage swell, and voltages unbalances. The role of DVR to compensate load voltage is investigated during the different supply conditions like voltage sag, voltage swell, and supply voltage unbalance. Therefore, it is a highly prospective branch of energy, which would play a significant role in the future.

Simulation-based analysis of dynamic voltage restorer with sliding mode controller at optimal voltage for power quality enhancement in distribution system

Introduction. Nowadays, power quality issues are of considerable interest to both utilities and end users as they cause significant financial losses to the industrial customers. Due to this, power quality assurance in power distribution systems is very important, when considering commercial and industrial applications. Problem Statement. Unfortunately, sudden faults such as sag, transients, harmonics distortion and notching in the power system create disturbances and affect the load voltages. Out of these, voltage sag and harmonics seriously affect sensitive devices. Harmonics in the power system cause increased heating of equipment and conductors, misfires in variable speed drives, and torque pulsations in motors. Harmonics reduction is considered desirable. Methodology. This paper presents an efficient and robust solution to this problem by using dynamic voltage restorer in series with distribution system. Dynamic voltage restorer is economical and effective solution for protecting sensitive loads from harmonics and sag. Control strategy is adopted with dynamic voltage restorer topology and the performance with the proposed controller is analyzed. Novelty. In this research work modelling, analysis and simulation of dynamic voltage restorer with proportional integral controller and dynamic voltage restorer with sliding-mode controller at optimal voltage is used to improve the dynamic voltage restorer performance by reducing total harmonic distortion. Results. The simulation is performed in MATLAB / Simulink software package and comparative analysis of dynamic voltage restorer with different controllers for distribution system is presented. The proposed scheme successfully reduced percentage total harmonics distortion and voltage sag using dynamic voltage restorer with sliding mode controller at optimal voltage which is found to be 0.38 %.

Design and simulation of Dynamic Voltage Restorer (DVR) supported by solar panels

This work presents the design and simulation of a Dynamic Voltage Restorer (DVR) to mitigate power quality problems such as voltage sags and swells at sensitive loads to these types of disturbances, but with a compensation topology using one the most popular of the renewable energies, currently employed, which is photovoltaic solar energy. The DVR must operate with a control loop, monitoring the voltage at the load side and generating the voltage for compensation during the disturbances. The energy is obtained, from an array of solar panels for the injection of active power. The control algorithm discussed in this article is based on the Clark and Park transformations to generate the required signals for voltage compensation, these mathematical techniques allow fixing the variables and hence simplicity for the controller design. The results of the simulation in MATLAB/Simulink are used to show the performance of the proposed topology with symmetrical voltage sags in the distribution system.

Modelling Analysis and Simulation of Dynamic Voltage Restorer in the Distribution System

Modelling Analysis and Simulation of Dynamic Voltage Restorer in the Distribution System

Research on Topology, Control and Simulation of DVR

Dynamic voltage restorer (DVR) is a series compensation device with energy storage device, which can compensate reactive power and active power. DVR is composed of power module, action module, control module and sampling module. The core of the research lies in its topology and control strategy. This paper starts from the above two aspects, studies the working principle and structural characteristics of the dynamic voltage restorer, and analyzes the topological structure and the function of the structure of the dynamic voltage restorer. A voltage and current double closed-loop control strategy is proposed, which can effectively compensate the transient voltage. A DVR model is built in Matlab/Simulink, and power failure and three-phase short circuit are simulated. A double closed-loop control strategy based on voltage and current is applied. The simulation results show the feasibility and effectiveness of the control strategy.

Voltage Sag Compensation Using Dynamic Voltage Restorer

Power quality plays a very important vital role in the modern utility grid where sensitive loads are employed. Equipment damage, temporary shutdowns, product quality degradation and Voltage Sag are the major problem associated with power quality. Dynamic Voltage Restorer (DVR) is a powerful device which is used to improve voltage mitigation of weak buses associated in a multi-bus system. This paper incorporates the functional performance of DVR during voltage sag in the power system. Penetrating a voltage of required magnitude and frequency to restore the voltage across the load within the desired amplitude is the main objective of DVR. The proposed work based on modeling and simulation of DVR, in a closed-loop control of an eight bus system. Voltage compensation is done effectively using DVR in the Closed loop FLC controlled system and its analyzed with PID Controlled system. The simulation result shows Closed loop FLC system using DVR is observed to be faster than PID controlled systems.

English

Custom power is a concept based on the application of power electronic controllers in distribution system to improve the power quality. Dynamic Voltage Restorer (DVR) is one of the custom power devices that can mitigate voltage sag/swell, unbalance and voltage harmonics originating from supply side. DVR has become very popular in recent years in both low voltage and medium voltage applications. In this paper modelling and simulation of DVR, its functions, configurations, components and various control strategies are presented. DVR is fast, flexible and efficient solution to voltage sag problem. This paper discussed abc to dqo base new control algorithm to generate the pulses. This control scheme is simple to design and has excellent voltage compensation capabilities. New discussed case in this paper is supply voltage containing harmonics. Effectiveness of proposed technique is investigated through computer simulation by using MATLAB/SIMULINK software. The simulation results have shown validation of the control system.

Design and Simulation of Dynamic Voltage Restorer based on Fuzzy Controller Optimized by ANFIS

The fuzzy logic controller (FLC) appears to be the unique solution when the process is too complex for analysis by conventional techniques or when the available information data are interpreted qualitatively, inexactly or with uncertainty. In literature, the proposed FLC in general consists of two inputs (error and derivative of error) and one output. The number of membership functions is chosen in most cases to be five or seven regardless of the approach used for the design. In this paper, we propose Adaptive Neuro-Fuzzy Inference System (ANFIS) approach to optimize the two inputs one output FLC with seven membership functions to one input one output FLC with three membership functions without compromising accuracy. The study is applied to control a Dynamic Voltage Restorer (DVR) in voltage sag/swell mitigation. The results of simulation using MATLAB/SIMULINK show that the performance of the optimal FLC generated by ANFIS is comparable with the initial given FLC. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5685

Analysis, Modeling and Simulation of Dynamic Voltage Restorer (DVR)for Compensation of Voltage for sag-swell Disturbances

Dynamic voltage restorer (DVR) can provide the most commercial solution to mitigate voltage sag by injecting voltage as well as power into the system. This paper describes the effectiveness of using dynamic voltage restorers (DVRs) in order to mitigate voltage sags in power distribution systems at critical loads. The DVR is a power electronic based device that provides three-phase controllable voltage source, whose voltage vector(magnitude and angle) adds to the source voltage during sag event, to restore the load voltage to pre-sag conditions. The DVR can restore the load voltage within few milliseconds. A control technique based on aproportional–integral (PI) controller and a selective controller is used. The controller is designed in asynchronously-rotating reference frame. In fact, three independent controllers (homo polar component, d-axis component and q-axis component) have been used to tackle balanced and unbalanced voltage supplies. Simulation results using Simulink’ Sim Power System Toolbox is presented to illustrate the principle and performance of a DVR operation in load voltage compensation.

Mitigation of Voltage Sags and Swells by Dynamic Voltage Restorer

This paper presents the modelling and simulation of Dynamic Voltage Restorer (DVR) for mitigation of voltage sags and swells which are the major problems and issues on non linear loads.The Dynamic Voltage Restore (DVR) has become popular as a cost effective solutions for the protection of sensitive loads from voltage sags and swells.. The control of compensation voltages in DVR based on a-b-c to d-q-0 algorithm is discussed. The proposed control technique is cost effective and simple to design. Computer simulations are carried out in a suitable test system to investigate the effectiveness of control technique by using MATLAB/SIMULINK software.

Simulation and Analysis of DVR for Mitigating Voltage Sags and Swells

This paper presents the modelling and simulation of Dynamic Voltage Restorer (DVR) for mitigation of voltage sags and swells which are the major problems and issues on nonlinear loads using Feed-forward Instantaneous power theory. In recent years, utilities have been faced with rising number of complaints about the quality of power due to sags and swells. The Dynamic Voltage Restore (DVR) has become popular as a cost effective solutions for the protection of sensitive loads from disturbances .Whenever power quality problems occur, DVR has to automatically detect and inject required voltage to the system. The performance of DVR depends on efficiency of the control technique involved in switching the inverters. The control of compensation voltages in DVR based on a-b-c to d-q-0 algorithm is discussed. A comparative study has been carried out to analyse the effectiveness using fuzzy controller and without using fuzzy controller with proposed technique by MATLAB/SIMULINK software.

Performance of DVR under various Fault conditions in Electrical Distribution System

Power quality improvement has become a major area of concern in present era. Due to the increase in modern sensitive and sophisticated loads connected to the Distribution System it has been very important to improve the quality of power because nonstandard voltage, current or frequency results a failure of the loads connected to the systems. Power electronics and advanced control technologies have made it possible to improve the quality of power and operate the sensitive loads satisfactorily. One of the major problems dealt in this paper is the voltage quality which is very severe for the industrial customers as it can cause malfunctioning of several sensitive electronic equipments. Dynamic Voltage Restorer (DVR) is a solution to improve voltage quality, which is connected in series with the network. This paper presents modelling, analysis and simulation of DVR in MATLAB SIMULINK, which includes PI controller and discrete PWM generator for control purpose of DVR. Simulation results of performance of DVR under different fault conditions such as single line to ground fault (SLG), double line to ground fault (DLG), line to line fault (L-L), three phase to ground fault etc. are presented in this paper. The results showed clearly the performance of the DVR in voltage quality improvement.