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Design of an Efficient Dynamic Voltage Restorer for Compensating Voltage Sags, Swells, and Phase Jumps ABSTRACT: This paper presents a novel design of a dynamic voltage restorer (DVR) which mitigate voltage sags, swell, and phase jumps by injecting minimum active power in system and provides the constant power at load side without any disturbance. The design of this compensating device presented here includes the combination of PWM-based control scheme, dq0 transformation and PI controller in control part of its circuitry, which enables it to minimize the power rating and to response promptly to voltage quality problems faced by today’s electrical power industries. An immense knowledge of power electronics was applied in order to design and model of a complete test system solely for analyzing and studying the response of this efficient DVR. In order to realize this control scheme of DVR MATLAB/SIMULINK atmosphere was used. The results of proposed design of DVR’s control scheme are compared with the results of existing classical DVR which clearly demonstrate the successful compensation of voltage quality problems by injecting minimum active power.
KEYWORDS: 1. Dynamic voltage restorer 2. Voltage sags 3. Voltage swells 4. Phase jumps 5. PWM-based control 6. DQ0 transformation 7. PI controller
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 SOFTWARE: MATLAB/SIMULINK BLOCK DIAGRAM:
Fig.1. Block Diagram of DVR
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 EXPECTED SIMULATION RESULTS:
Fig.2.Source Voltage with Sag of 0.5 p.u.
Fig.3.Load Voltage after Compensation through proposed DVR
Fig.4. Load Voltage after Compensation through classical DVR
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Fig.5. Voltage injected by proposed DVR as response of Sag
Fig.6.Source Voltage with Swell of 1.5 p.u.
Fig.7. Load Voltage after compensation through proposed DVR
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. Fig.8. Load Voltage after Compensation through classical DVR
Fig.9. Voltage injected by DVR as response of Swell
Fig.10. .Load Voltage after Compensation of Phase jump
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Fig.11. dq0 form of difference voltage obtained by proposed DVR
Fig.12.dq0 form of difference voltage obtained by classical DVR
CONCLUSION: As the world is moving towards modernization, the most essential need that it has is of an efficient and reliable power of excellent quality. Nowadays, more and more sophisticated devices are being introduced, and their sensitivity is dependent upon the quality of input power, even a slight disturbance in power quality, such as Voltage sags, voltage swells, and harmonics, which lasts in tens of milliseconds, can result in a huge loss because of the failure of end use equipments. For catering such voltage quality problems an efficient DVR is proposed in this paper with the capability of mitigating voltage sags, swells, and phase jumps by injecting minimum active power hence decreasing the VA rating of DVR. compensation of voltage quality problems using a comparatively low voltage DC battery and by injecting minimum active power.
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REFERENCES: [1] Kumar, R. Anil, G. Siva Kumar, B. Kalyan Kumar, and Mahesh K. Mishra. "Compensation of voltage sags and harmonics with phasejumps through DVR with minimum VA rating using Particle Swarm Optimization." In Nature & Biologically Inspired Computing, 2009. NaBIC 2009. World Congress on, pp. 1361-1366. IEEE, 2009. [2] Songsong, Chen, Wang Jianwei, Gao Wei, and Hu Xiaoguang. "Research and design of dynamic voltage restorer." In Industrial Informatics (INDIN), 2012 10th IEEE International Conference on, pp. 408-412. IEEE, 2012. [3] A. Bendre, D. Divan, W. Kranz, and W. E. Brumsickle, "Are Voltage Sags Destroying Equipment?," IEEE Industry Applications Magazine, vol. 12, pp. 12-21, July-August 2006. [4] Nielsen, John Godsk, and Frede Blaabjerg. "A detailed comparison of system topologies for dynamic voltage restorers." Industry Applications, IEEE Transactions on 41, no. 5 (2005): 12721280. [5] Zhou, Hui, Jing Zhou, and Zhi-ping Qi. "Fast voltage detection for a single-phase dynamic voltage restorer (DVR) using morphological low-pass filters." In Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on, pp. 2042-2046. IEEE, 2008.
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