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A Dynamic Voltage Restorer (DVR) model is designed for the mitigation of voltage sag and is tested for distribution system to improve Power Quality (PQ). The design is carried out with the aid of Voltage Source Inverter (VSI) in the application of DVR. The experimental results obtained are presented in this paper to analyze the performance of VSI with Sinusoidal Pulse Width Modulation (SPWM) control...
DVR control requires a robust algorithm for computing grid voltage magnitude and phase angle. Conventional SRF-PLL performs poorly as it cannot filter out negative sequence voltages and harmonics that could occur in the grid voltage. In this paper a Positive and Negative Sequence Extractor (PNSE) is formed by a Delayed Signal Cancellation (DSC) filter, which filters harmonics and extracts Instantaneous...
This paper discuss control of DVR using SPLL (Software Phased Locked Loop) strategy for compensation of PQ disturbances in power DS (Distribution System) network. Using this control strategy, fundamental reference load voltages are estimated using magnitude of fundamental active and reactive components of source voltages. The SPLL strategy based DVR is modeled in MATLAB R2013b environment using SIMULINK...
This paper introduces a predictive voltage controller for multilevel inverter used in Dynamic Voltage Restorer, which is able to protect a sensitive load against grid voltage sags dynamically. The compensated voltages are obtained by using Phase-Lock Loop to detect the phase and the magnitude of the grid voltage then compare to the load reference voltage. A three-phase NPC inverter with output LC...
To mitigate voltage disturbances in low voltage distribution system dynamic voltage restorer (DVR) with energy storage device is used in this paper. DVR is installed between supply and load which will inject voltage and active power to the distribution system during balanced voltage sag and swell disturbances. The super capacitor is used as an energy storage device in this paper. The performance of...
Voltage sags caused by short circuit in a distribution system can heavily influence power quality parameters. In this paper an application of custom DVR is analyzed and proposed for mitigating of voltage sags considering unbalance, voltage sags and fluctuations and distortion of voltages in an industrial distribution system. The paper presents system operation and controller design approaches, verified...
The most severe power quality problems are known as voltage sag, swell and harmonics. Series connected custom power device called as dynamic voltage restorer (DVR) is the most effective device used in electrical systems to compensate these power quality problems. Traditional DVR compensates only voltage sag/swell in electrical grids. The main contribution of this paper is that FFT based a novel reference...
The most interesting issue for electrical engineers is power quality/power quality improvement in modern era. Power quality is the most noticeable trouble for electrical engineering students. This problem occurs due to occurrence of substandard voltage, may be substandard current, and of frequency which contain harmonics which may damage to power system equipments. Many power supplying companies,...
A power quality problem is an occurrence which depicted as a nonstandard voltage, current or frequency that results in a failure or a dis-functioning of end use equipments causing a havoc to system performance. The aim therefore, in this work to maintain a proper voltage profile by mitigation of sag due to faults in power system occurred due to several reasons like energizing of heavy loads, transformers,...
Accurate estimation of grid phase angle and magnitude is important for effective operation of Dynamic Voltage Restorer (DVR). Under unbalanced voltage sags, the estimated output voltages of a conventional SRF-PLL contain a second harmonic ripple which makes it difficult to control DVR. In this paper a DSOGI pre-filter based PLL is employed to extract the symmetrical components of the grid voltage...
One of the undesirable power quality phenomenon in the distribution systems is voltage sag which risks the operation of sensitive loads. Dynamic voltage restorer (DVR) is well-known and reliable solution to mitigate this phenomenon and protect the sensitive loads. This paper proposes new configuration of DVR for medium-voltage applications. The proposed configuration contains diode rectifier to converter...
One of the control strategies of DVR (Dynamic Voltage Restorer) is minimum energy control strategy which is explained in this paper. The main duty of power system is to supply their customers a uninterruptable power supply at all the times, but in practice it is not happening. However, the total power system is the large network which contains different types of loads at the same point of common coupling...
In this study, a new method is proposed for the suppression of voltage amplitude fluctuations on the load terminals. Moreover, the voltage harmonics on the load terminals are effectively reduced below the defined limits in the IEEE-519 standard. In the studied topology, a twelve-switch three-phase voltage source converter is used for effective control on the zero-sequence components due to the unbalanced...
Custom power park is an industrial/commercial park that integrates state-of-the-art power quality devices. The power quality devices can be classified into two catalogues: voltage quality enhancement devices and current quality enhancement devices. In order to meet the requirement of large capacity, high reliability, high flexibility in both the voltage and current compensation, several operation...
The future custom power park will realize the hierarchical power supply of different voltage quality grade, meanwhile and present the grid-friendly characteristics including low pollution for grid, organic combination with distributed generation (DG) and energy storage (ES). In order to gradually achieve the goals, the function reuse and integration in the equipment level should be solved firstly...
In this paper, a new hybrid unified power quality conditioner (HUPQC) is proposed to improve current and voltage imperfections in distribution systems. The proposed HUPQC is comprised of the shunt hybrid active power filter (SHAPF), the dynamic voltage restorer (DVR) and the isolated bi-directional DC-DC converter. The main contribution of the study is a new HUPQC topology that enables the reduction...
Voltage sag is one of the most severe power quality disturbances to be dealt with by the industrial sector, as it can cause severe process disruptions and results in substantial economic loss. This paper presents an optimal method of control for the low voltage dynamic voltage restorer (DVR). The DVR was a power electronics device that was able to compensate voltage sags on critical loads dynamically...
In this study a method is proposed in order to improve the voltage compensation performance of Dynamic Voltage Restorer by using Self Tuning Filter. The proposed control method gives an adequate voltage compensating even for 50% voltage sag and distorted voltage conditions. The proposed DVR control method is modelled using MATLAB/Simulink and tested both in off-line and real-time environment. Results...
The Dynamic Voltage Restorer (DVR) is the series connected Custom Power Device (CPDs) to compensate voltage based distortions such as voltage sag, swells, unbalance and harmonics, flickers etc. for a linear & non-linear sensitive load. In this paper, a three-phase three wire battery supported DVR is considered to compensate voltage sag, swells, unbalance, harmonics and their combinations in supply...
This paper proposes a sensor fault detection system for a two-level DVR, controlled by a repetitive controller. The system compensates key voltage-quality disturbances namely; voltage sags, harmonic voltages, voltage imbalances, and control current during downstream fault, additionally detect any fault in sensor measurements as well. All the control actions of controller depend on the availability...
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