Fault Classification in a TCSC Compensated Transmission Line During Power Swing Using Wigner Ville Transform

Abstract

During power supply swings, current and voltage waveforms are modulated with additional frequency elements which lead to maloperation of relays. This maloperation may cause cascade tripping of transmission lines, which results in the failure of electrical grid networks. Power Swing Blockers (PSBs) are employed to block and prevent maloperation of distance relays during power swing. Along with power swing, the presence of TCSC compensation in transmission line deteriorates the input signals to relays which make fault classification a complex task. During the PSB blocking period, modulated signals distorted with non-linearities of MOV operation complicate the fault diagnosis functioning. This challenge motivates to develop an algorithm for fault classification during power swings. To address aforementioned challenges, a Wigner Ville energy-based fault classification technique is proposed in this work. A modified 9 bus WSCC system with TCSC compensation is used for testing and validation of the proposed scheme. The scheme is tested for different cases like symmetrical, close-in fault, asymmetrical high resistance fault, and CT saturation, etc. The scheme is also validated against transient conditions like load and capacitor switching. The performance of proposed scheme is compared with existing schemes in literature. The above scheme is also implemented and validated on an Intel Cyclone V SOC FPGA. The results show that the proposed scheme classifies faults accurately during the simulation as well as on hardware platform.

Keywords:

• Fault classification
• Hilbert transform
• Power swing
• Series compensation
• TCSC
• Wigner Ville transform

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

M. L. S. Sai Kumar

M L S Sai Kumar received the MTech degree from National Institute of Technology, Jamshedpur, Jharkhand, India, in 2015. He is currently working towards the PhD degree in the Department of Electrical Engineering, NIT Jamshedpur, Jharkhand, India. His research interests are power system protection and automatic generation control.

Jitendra Kumar

Jitendra Kumar received his MTech in power systems from National Institute of Technology, Kurukshetra, India and the PhD degree in electrical engineering from the Indian Institute of Technology Roorkee, Uttarakhand, India. Currently, he is an assistant professor in the Department of Electrical Engineering, National Institute of Technology, Jamshedpur, India. His research interests include digital protection of power systems, advanced protection algorithm design in the presence of FACTS, and microgrid area, deregulation. Email: [email protected]

R. N. Mahanty

R N Mahanty received MTech degree from Regional Institute of Technology, Jamshedpur, India in 1988 and PhD degree from Indian Institute of Technology, Kharagpur, India in 2003. He is working as professor in the Department of Electrical Engineering at National Institute of Technology, Jamshedpur, India. His areas of research interest include power system protection, digital relaying and application of ANN, wavelet transform and fuzzy logic to power system protection Email: [email protected]