“20th PSCC 2018 papers submission and review platform

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Optimization of First Zone Boundary of Adaptive Distance Protection for Flexible Transmission Lines

Traditionally, the tripping boundaries of distance protection zones are based predominantly on engineering experience and can be overly conservative, which reduces the reach of these zones. The installation of series compensation devices further reduces the protection zones, which is undesirable for a number of reasons. Despite research efforts to address this problem, developing a protection algorithm that constructs the first zone boundary containing only all separable internal faults remains a challenging task. This paper presents a new optimization-based algorithm for constructing the tripping boundary of the first protection zone for transmission lines with series compensation devices. The obtained boundary encloses all internal line faults that can be separated from external ones and is valid for a predefined range of values of the compensation device reactance around its current operating point. The simulation results demonstrate that the proposed algorithm improves the reach of the first protection zone and is computationally efficient.

Author(s):

Nadezhda Davydova    
ETH Zurich
Switzerland

Dmitry Shchetinin    
ETH Zurich
Switzerland

Gabriela Hug    
ETH Zurich
Switzerland

 

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