The Experts below are selected from a list of 20853 Experts worldwide ranked by ideXlab platform
Yutthachai Sillapawicharn - One of the best experts on this subject based on the ideXlab platform.
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A fast single-phase Voltage Sag detection for Voltage Sag compensation system
TENCON 2014 - 2014 IEEE Region 10 Conference, 2014Co-Authors: Yutthachai SillapawicharnAbstract:This paper proposes a fast single-phase Voltage Sag detection for Voltage Sag compensation system. The operation of proposed method is based on synchronously rotating reference frame which provides fast and accurate Voltage Sag detection. a proposed fast single-phase Voltage Sag detection uses the differentiator as a (−90)-degree phase shifter to produce an orthogonal AC Voltage (Vβ) from existing grid Voltage (Vα) and convert these Voltages to the DC Voltages (Vd, Vq) by using of αβ-dq transformation (Park transformation). Finally the Sag signal can be generated by these DC Voltages (Vd, Vq). The Voltage Sag can be recognized by the proposed method in a very short time in every condition of Voltage Sags. When it is integrated to the Voltage Sag compensation system, the Voltage Sag can be compensated in a very short time due to fast detection and the load Voltage is slightly affected from the Voltage Sag event.
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Dual low pass filter-based Voltage Sag detection for Voltage Sag compensator under distorted grid Voltages
2014 International Electrical Engineering Congress (iEECON), 2014Co-Authors: Yutthachai Sillapawicharn, Yuttana KumsuwanAbstract:In this paper, dual low pass filter (DLPF)-based Voltage Sag detection for Voltage Sag compensator under distorted grid is proposed. The conventional synchronously rotating reference frame (CSRRF)-based Voltage Sag detection is the most famous Voltage Sag detection method in the past. However it has a huge disadvantage as a long delay of detection time. The detection time is moderately improved by the improved modified synchronously rotating reference frame (IMSRRF)-based Voltage Sag detection. This paper presents DLPF-based Voltage Sag detection which is providing the shortest detection time when comparing to other methods. The performance of proposed Voltage Sag detection is verified via computer simulations in various conditions.
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An application of improved synchronous reference frame-based Voltage Sag detection in Voltage Sag compensation system
2013 15th European Conference on Power Electronics and Applications (EPE), 2013Co-Authors: Y. Kumsuwan, Yutthachai SillapawicharnAbstract:This paper proposes an application of improved synchronous reference frame (ISRF)-based Voltage Sag detection in Voltage Sag compensation system. The ISRF-based Voltage Sag detection presents the fast detection time that is suitable to use in Voltage Sag compensation system. The proposed Voltage Sag compensation system consists of ISRF-based Voltage Sag detector, static transfer switches (STSs), and alternative Voltage source using the inverter. In a normal incident, the load fed the power from main Voltage source via the main STS. When the Voltage Sag occurs and it is detected by the Voltage Sag detector, the alternative STS connects the load to an alternative Voltage source instead of the main STS. The computer software simulation and the experiment were made to investigate and verify the operation of proposed Voltage Sag compensation system. It can be seen from the results that a short Voltage Sag detection time is obtained and Voltage Sag can be compensated with the proposed system.
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A fast synchronously rotating reference frame-based Voltage Sag detection under practical grid Voltages for Voltage Sag compensation systems
6th IET International Conference on Power Electronics Machines and Drives (PEMD 2012), 2012Co-Authors: Yuttana Kumsuwan, Yutthachai SillapawicharnAbstract:A Fast synchronously rotating reference frame (FSRRF)- based Voltage Sag detection under practical grid Voltages for Voltage Sag compensation systems is proposed in this paper. The proposed Voltage Sag detection is also based on abc-dq transformation as conventional synchronously rotating reference frame (CSRRF)-based Voltage Sag detection but adding of 2ω component eliminator (2ω component is generated by synchronously rotating reference frame-based transformation in unbalance Voltage Sag conditions) and dedicated band-stop filter (BSF) (to exclude the effect from harmonic Voltages in practical grid Voltages) then very fast Voltage Sag detection time under practical grid Voltages condition is achieved. The computer software simulation and the experimentation are made to investigate and verify the operation of proposed Voltage Sag detection. The detection time of FSRRF-based Voltage Sag detection is around one eighth of CSRRF-based Voltage Sag detection in the case of single-phase Voltage Sag and around one fifth in the case of two-phase Voltage Sag. This Voltage Sag detection can be used in any Voltage Sag or interruption compensation systems to improve their performance.
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An improvement of synchronously rotating reference frame based Voltage Sag detection for Voltage Sag compensation applications under distorted grid Voltages
2011 IEEE Ninth International Conference on Power Electronics and Drive Systems, 2011Co-Authors: Yutthachai Sillapawicharn, Yuttana KumsuwanAbstract:An improvement of synchronously rotating reference frame based Voltage Sag detection for Voltage Sag compensation applications under distorted grid Voltages is proposed. The Voltage Sag detection is the one of important parts in the Voltage Sag compensation processes. In the past, the conventional synchronously rotating reference frame (CSRRF) based Voltage Sag detection is widely used in the Voltage Sag compensation applications. Its disadvantage is a long delay of detection time. This means the next process initiation of Voltage Sag compensation is also delayed, and then the load Voltage can be affected from Voltage Sag. The modified synchronously rotating reference frame (MSRRF) based Voltage Sag detection is able to detect the Voltage Sag in a short delay of detection time by differentiator employment. However, its operation under the distorted grid Voltages condition is unavailable because of the sensitivity of differentiator action to the high frequency components that caused by Voltage harmonic. This paper proposed the improvement of MSRRF based Voltage Sag detection under distorted grid Voltages. The operation of proposed improved MSRRF, MSRRF, and CSRRF based Voltage Sag detections are investigated via computer simulation to verify the advantage of proposed Voltage Sag detection.
Tarik Erfidan - One of the best experts on this subject based on the ideXlab platform.
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a new approach to Voltage Sag detection based on wavelet transform
International Journal of Electrical Power & Energy Systems, 2010Co-Authors: Ozgur Gencer, Semra Ozturk, Tarik ErfidanAbstract:In this work, a new Voltage Sag detection method based on wavelet transform is developed. Voltage Sag detection algorithms, so far have proved their efficiency and computational ability. Using several windowing techniques take long computational times for disturbance detection. Also researchers have been working on separating Voltage Sags from other Voltage disturbances for the last decade. Due to increasing power quality standards new high performance disturbance detection algorithms are necessary to obtain high power quality standards. For this purpose, the wavelet technique is used for detecting Voltage Sag duration and magnitude. The developed Voltage Sag detection algorithm is implemented with high speed microcontroller. Test results show that, the new approach provides very accurate and satisfactory Voltage Sag detection.
Xu Xi - One of the best experts on this subject based on the ideXlab platform.
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a derivation algorithm to detect characteristic quantity of single phase Voltage Sag
Power system technology, 2009Co-Authors: Xu XiAbstract:Dynamic Voltage restorer(DVR) is an effective equipment to improve Voltage quality.When the grid Voltage Sag occurs,it will directly impact on the compensation result of DVR that the characteristic quantity of power grid Voltage Sag could be detected rapidly and precisely or not.On the basis of researching existing detection methods of characteristic quantity of Voltage Sag,an αβ derivation algorithm suitable to single-phase Voltage Sag is proposed,in which the phase delay algorithm in αβ transform is replaced by derivation and the impact of harmonics that possibly appear during the Voltage Sag is taken into account.Simulation results show that the proposed algorithm possesses following advantages such as high detection precision and good real-time performance,thus it can meet the demand of DVR detection.
Ahmet Teke - One of the best experts on this subject based on the ideXlab platform.
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a novel wavelet transform based Voltage Sag swell detection algorithm
International Journal of Electrical Power & Energy Systems, 2015Co-Authors: Mohammad Barghi Latran, Ahmet TekeAbstract:Abstract This paper proposes a novel Sag/swell detection algorithm based on wavelet transform (WT) operating even in the presence of flicker and harmonics in source Voltage. The developed algorithm is the hybrid of Daubechies wavelets of order 2 (db2) and order 8 (db8) to detect Voltage Sag/swell with and without positive/negative phase jumps. The hybrid detection algorithm can detect the start and end times of Voltage Sag/swell with and without phase jumps within 0.5 ms and 1.15 ms, respectively. The performance of the proposed Voltage Sag/swell detection method is compared with the results of dq-transformation, Fast Fourier Transform (FFT) and Enhanced Phase Locked Loop (EPLL) based Voltage Sag/swell detection methods. The good robustness and faster processing time to detect balanced and unbalanced Voltage Sag/swell are provided using proposed method. With the proposed hybrid detection algorithm consisting of db2 and db8 wavelet functions, a robust Sag/swell detection is achieved which can give precise and quick response. The performance of proposed hybrid algorithm is validated and confirmed through simulation studies using the PSCAD/EMTDC analysis program.
Ozgur Gencer - One of the best experts on this subject based on the ideXlab platform.
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a new approach to Voltage Sag detection based on wavelet transform
International Journal of Electrical Power & Energy Systems, 2010Co-Authors: Ozgur Gencer, Semra Ozturk, Tarik ErfidanAbstract:In this work, a new Voltage Sag detection method based on wavelet transform is developed. Voltage Sag detection algorithms, so far have proved their efficiency and computational ability. Using several windowing techniques take long computational times for disturbance detection. Also researchers have been working on separating Voltage Sags from other Voltage disturbances for the last decade. Due to increasing power quality standards new high performance disturbance detection algorithms are necessary to obtain high power quality standards. For this purpose, the wavelet technique is used for detecting Voltage Sag duration and magnitude. The developed Voltage Sag detection algorithm is implemented with high speed microcontroller. Test results show that, the new approach provides very accurate and satisfactory Voltage Sag detection.
