Fault Classification and Section Identification of an Advanced Series-Compensated Transmission Line Using Support Vector Machine

P. K. Dash, S. R. Samantaray, Ganapati Panda
2007 IEEE Transactions on Power Delivery  
Distance protection of flexible ac transmission lines, including the thyristor-controlled series compensator (TCSC), static synchronous compensator, and static var compensator has been a very challenging task. This paper presents a new approach for the protection of TCSC line using a support vector machine (SVM). The proposed method uses postfault current samples for half cycle (ten samples) from the inception of the fault and firing angle as inputs to the SVM. Three SVMs are trained to provide
more » ... fault classification, ground detection, and section identification, respectively, for the line using TCSC. The SVMs are trained with polynomial kernel and Gaussian kernel with different parameter values to get the most optimized classifier. The proposed method converges very fast with fewer numbers of training samples compared to neural-network and neuro-fuzzy systems which indicates fastness and accuracy of the proposed method for protection of the transmission line with TCSC. Index Terms-Distance protection, flexible ac transmission system (FACTS) support vector machine (SVM), thyristor-controlled series compensator (TCSC). I. INTRODUCTION T HE USE of flexible ac transmission system (FACTS) devices to improve the power transfer capability in a highvoltage transmission line is of greater interest these days. The thyristor-controlled series compensator (TCSC) [1] is one of the main FACTS devices, which has the ability to improve the utilization of the existing transmission system. The TCSC-based compensation possesses a thyristor-controlled variable capacitor protected by a metal-oxide varistor (MOV) and an air gap. However, the implementation of this technology changes the apparent line impedance, which is controlled by the firing angle of thyristors, and is accentuated by other factors including the MOV. The presence of the TCSC in the fault loop not only affects the steady-state components but also the transient components. The controllable reactance, the MOVs protecting the capacitors, and the air gaps' operation make the protection decision more complex and, therefore, the conventional relaying scheme based on fixed settings has its limitations. Manuscript received July 12, 2005. Paper no. TPWRD-00398-2005. P. K. Dash is with
doi:10.1109/tpwrd.2006.876695 fatcat:3q2mpgvbjfbfdkarr65j6y3bcq