Intelligent Power Quality Improvement and Protection of Power Converters Connected to the Grid
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May 28, 2019
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Abstract
The major problems with the high power converters connected to the grid are the increased currents harmonics introduced by switching and the poor power quality. Further, it is essential to identify and recover the system during the fault occurance. Failure to recover the power converters from the fault will lead to jeopardy and hence is not preferred. A new intelligent system is proposed for the fault isolation and the power quality improvement. The proposed system uses shunt active filter (ASF) and Thyristor Switched Capacitor (TSC) to recover the converter from the fault condition. The proposed system is designed, simulated and implementated. The simulations were made with and without faults triggered at desired intervals. The simulated results are further validated with the hardware setup. The results validate that the proposed sytem greatly reduces the currents harmonics and improves the power factor.
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[3] Mark Sumner, et.al, Real Time Parameter Estimation for Power Quality Control and Intelligent Protection of Grid Connected Power Electronic Converters, IEEE Trans. Smart Grid, Vol.5, No.4, pp.1602-1607, 2014
[4] Srikanth Mahanthy, Power quality conditioning using series active power filter to compensate flickering and unbalanced loads, Journal of Electrical Engineering, Vol. 18, No. 1(46), 2018.
[5] G.Sundar, Sajan J Mathew, B.Prabakaran, Investigations on voltage stability improvement with STATCOM in multiarea system using FLC, Journal of Electrical Engineering, Vol.17, No.2 (18), 2017
[6] L. Asiminoaei, R. Teodorescu, A dig-ital controlled PV-inverter with grid impedance estimation for ENS detection, IEEE Trans. Power Electron. , Vol. 20, No. 6, pp. 1480–1490, 2005.
[7] M. Sumner, B. Palethorpe, and D. W. P. Thomas, Impedance measurement for improved power quality—Part 2: A new technique for standalone active shunt filter control, IEEE Trans. Power Del. , Vol.19, No. 3, pp. 1457–1463,. 2004
[8] Ren and M. Kezunovic, Real-time power system frequency and phasors estimation using recursive wavelet transform, IEEE Trans. Power Del. , Vol. 26, No. 3, pp. 1392–1402, 2011.
[9] Hazem Hassan Ali Gaber ElSaady, Grid SideConverter Based Shunt Active Power Filter of Variable Speed Doubly Fed Induction Generator Driven By Wind Turbine, Journal of Electrical Engineering, Vol. 17, No. 4(69), 2017.
[10] Tsukamoto, S.Ogawa, Y.Natsuda, Y.Minowa and S.Nishimura, Advanced technology to identify harmonics characterstics and results of measuring, Proc. 9th IEEE Int. Conf. Harmonics Quality Power, Vol. 1, pp. 341–346, 2000.
[11] M. Sumner, D. Thomas, A. Abusorrah, L. Yao, R. Parashar, and M. Bazargan, Intelligent protection for embedded generation using active impedance estimation, Proc. 2nd IEEE Int. Symp. Power Electron. Distrib. Gener. Syst. (PEDG) ,Jun. 16–18, 2010.