A New Differential Protection of Transmission Line Based on Equivalent Travelling Wave

This article aims to propose a novel single-end protection scheme for the compensated transmission line using traveling waves and game theory. First, this study evaluates the effects of thyristor controlled series capacitor (TCSC) on traveling waves (TW) passing through TCSC location. Following that, it investigates the impacts of TCSC switching on conventional protections based on the traveling wave theory. In the next stage, a single-end method will be presented to protect faults on compensated transmission lines with TCSC. Moreover, the game theory will be employed to discriminate extracted TWs in this article. In total, two techniques (ie, mathematical morphology filter [MMF] and discrete wavelet transform [DWT]) will be used to process the signals and investigate the sensitivity of the proposed scheme regarding the extraction techniques of TW. The proposed protection scheme is revealed to be a reliable and accurate method for all possible types of faults on compensated transmission lines at the middle of the line and with various fault inception angles.

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“…Figure 17 illustrates the decomposition of the signal into different frequency bands by DWT to achieve a multiresolution analysis. 34…”

Section: Discrete Wavelet Transformsmentioning

confidence: 99%

Traveling wave‐based protection for TCSC connected transmission lines using game theory

Khalili

Namdari

Rokrok

2020

Int Trans Electr Energ Syst

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“…Fast Traveling-Wave (TW) based differential protection schemes are proposed in [16,17]. However, these methods require high-speed processors to implement the proposed scheme for better operation.…”

Section: Effect Of Ct Saturationmentioning

confidence: 99%

A novel complex current ratio-based technique for transmission line protection

Gangolu

Sarangi

2020

Prot Control Mod Power Syst

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With respect to sensitivity, selectivity and speed of operation, the current differential scheme is a better way to protect transmission lines than overcurrent and distance-based schemes. However, the protection scheme can be severely influenced by the Line Charging Capacitive Current (LCCC) with increased voltage level and Current Transformer (CT) saturation under external close-in faults. This paper presents a new UHV/EHV current-based protection scheme using the ratio of phasor summation of the two-end currents to the local end current, instead of summation of the two-end currents, to discriminate the internal faults. The accuracy and effectiveness of the proposed protection technique are tested on the 110 kV Western System Coordinating Council (WSCC) 9-bus system using PSCAD/MATLAB. The simulation results confirm the reliable operation of the proposed scheme during internal/external faults and its independence from fault location, fault resistance, type of fault, and variations in source impedance. Finally, the effectiveness of the proposed scheme is also verified with faults during power swing and in series compensated lines.

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“…However, both of the initial FVTWs in different fault sections are dependent on those parameters. Therefore, the corresponding wavelet transform modulus maxima (WTMM) [26,27] of the 1-mode initial RVTW [25] can be utilized for fault section identification.…”

Section: Of 13mentioning

confidence: 99%

An Optimized Coordination Strategy between Line Main Protection and Hybrid DC Breakers for VSC-Based DC Grids Using Overhead Transmission Lines

et al. 2019

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Compared with alternating current (AC) power grids, the voltage-sourced converter (VSC)-based direct current (DC) grid is a system characterized by “low damping”, as a result, once there is a short-circuit fault on the DC transmission line, the fault current will rise more sharply and the influence range will be much wider within the same time scale. Moreover the phenomenon that a local fault causes a whole power grid outage is more likely to occur. Overhead transmission lines (OHLs) have been regarded as the mainstream form of power transmission in future high-voltage, large-capacity and long-distance VSC-based DC grids. However, the application of overhead transmission lines will inevitably lead to a great increase in the probability of DC line failure. Therefore, research on how to isolate the DC fault line quickly is of great significance. Based on the technology route for fault line isolation using DC breakers, on the basis of in-depth analysis of traditional coordination strategy, an optimized coordination strategy between line main protection and a hybrid DC breaker for VSC-based DC grids using overhead transmission lines is proposed in this paper, which takes the start-up output signal of line main protection as the pre-operation instruction of the corresponding hybrid DC breaker. As a result, the risks of blockage of the modular multilevel converter (MMC) closer to the fault position and of damage to power electronic devices in main equipment can be reduced effectively. Finally, the proposed coordination strategy was verified and analyzed through simulation.

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A New Differential Protection of Transmission Line Based on Equivalent Travelling Wave

Cited by 92 publications

References 28 publications

Traveling wave‐based protection for TCSC connected transmission lines using game theory

Traveling wave‐based protection for TCSC connected transmission lines using game theory

A novel complex current ratio-based technique for transmission line protection

An Optimized Coordination Strategy between Line Main Protection and Hybrid DC Breakers for VSC-Based DC Grids Using Overhead Transmission Lines

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