Fault detection and optimal coordination of overcurrent relay in offshore wind farm connected to onshore grid with VSC-HVDC

Abstract

SUMMARYA reliable protection system is needed for transmitting large amount of power over long distances. An alternating current-direct current mix network in offshore wind farm (OWF) interconnection with onshore grid offers a major challenge for faulty section identification. The transient faults in OWF system are simulated in MATLAB 7.10.0(R2010a). The fault signals, voltage and current, are retrieved at common collector platform and at voltage-source converter-high-voltage direct current sides of network in the OWF system. The detection capability of signal-processing techniques, Stockwell transform, empirical mode decomposition, and Hilbert transform, is explored for localization of different types of faults. In addition, fault events at onshore grid and those developed at the time of change in operating parameters are also simulated and analyzed. Further, the quantitative analysis for detection of fault events with the computation of maximum and mean indices and instantaneous time indices of the fault signal is presented in the study.Coordination of overcurrent relays is another challenging task in OWF interconnection with onshore grid system. The objective function of relay coordination problem is to minimize the operation time of associated relays. Time multiplier setting is used as the test variable in the objective function. An optimal coordination of overcurrent relays by using genetic algorithm, particle swarm optimization, and gravitational search algorithm is discussed in this paper. Further, these techniques are compared with hybrid meta-heuristic optimization method, a combination of particle swarm optimization and gravitational search algorithm to achieve relay coordination more efficiently.

An Overview in Protection Coordination Methods for Mitigation DGs Penetration in Distribution System. (Dept. E)

“…During fault time, each relay (Main& Backup) senses the fault, but the main relay should work first, and after a specific time the backup relay acts [44]. Fig.…”

“…In graph theory, utilizing the system structure determines the minimum group of breakpoints. The optimization technique reduces the urge to get the group of breakpoints which makes it popular among researchers [44,46].…”

A soft computing scheme incorporating ANN and MOV energy in fault detection, classification and distance estimation of EHV transmission line with FSC

“…Various fault-location algorithms for series-compensated lines have been developed so far. They apply one-end (Hosny and Safiuddin 2009 ; Ray 2014 ; Ray et al 2013 ; Parikh et al 2008 ; Abdelaziz et al 2005 ; Vyas et al 2014b ; Moravej et al 2012 ) and two-end measurements (Izykowski et al 2011 ; Rubeena et al 2014 ; Ahsaee and Sadeh 2011 ; Kang et al 2015 ; Eldin 2010 ; Hussain and Osman 2014 ; Al-Dabbagh and Kapuduwage 2005 ; Yusuff et al 2011 ; Ma et al 2015 ; Abdelaziz et al 2013 ) for two-terminal lines. In general, the impedance-based approach is the mostly applied.…”

“…Fault location by extreme learning machine with genetic algorithm based feature selection method is depicted in Ray ( 2014 ). Wavelet transform (WT) and wavelet packet transform (WPT) combining ANN method for fault distance estimation has been considered in Ray et al ( 2013 ) while a combined wavelet-support vector machine (SVM) technique for fault zone identification in series compensated transmission line has been investigated in Parikh et al ( 2008 ), Yusuff et al ( 2011 ). Two approaches based on travelling waves and two level ANN for fault type classification and faulted phase selection of series compensated transmission lines have been proposed in Abdelaziz et al ( 2005 ).…”

“…Both schemes in Jena and Samantaray ( 2015 ), Moravej et al ( 2011 ) lack to give fault distance estimation. In Ray ( 2014 ), Ray et al ( 2013 ), post fault one cycle voltage and current signals have been taken while in Parikh et al ( 2008 ), Ma et al ( 2015 ) post fault one cycle current signals have been considered. Post fault half cycle window signals are used in Vyas et al ( 2014a , b ), Yusuff et al ( 2011 ).…”