Ultra-high speed line protection algorithms performance evaluation for Directional Element | BEAMS

Ultra-high speed line protection algorithms performance evaluation for Directional Element

Project information
Project type: 
Master thesis
Academic year: 
Research unit: 
Electrical Energy
BEAMS supervisors
Academic promoter
Contact persons
Pr. Jean-Claude Maun, BEAMS, ULB (jcmaun [at] ulb [dot] ac [dot] be, 02-650.26.62)
Ir. Neriton Hoxha, BEAMS, ULB (nhoxha [at] ulb [dot] ac [dot] be, 02-650.26.55)
Context of the work
This project is part of a contract between SIEMENS AG in Berlin and the Beams-Energy department of the Ecole polytechnique ULB in Brussels. The goal is to develop ultra-high speed protection relay algorithms. The target is to reach a tripping time of 4ms.
During the history of protection relays, continuous attempts have tried to decrease the algorithms time response while considering
- Sensitivity
- Dependability
- Security
- Selectivity
The main difficulty will be to prove that these algorithms will reach the performances of security and selectivity for the “normal” cases, as defined in the standards, but will also be safe if the electrical conditions does not allow to be secure and selective. We must accept extreme cases where phasor-based algorithms must be used with their usual response time
The studied algorithms will focus on the “directional element” block.
Work to be done
  1. Theoretical study of algorithms based on
    1. Phasor estimation (reference case – no new development)
    2. Time domain estimation based on incremental (or superimposed) quantities
  2. Digital simulation platform to build the database of input electrical signals (using EMTP-ATP software)
    1. Classical model with impedance
    2. Three-phase Π model
    3. Three-phase multi-Π model
    4. Distributed model of line with constant parameters (Bergeron)
    5. Distributed model of line with parameters dependent on frequency (J. Marti)
  3. Optimization of the algorithms to maximize the test performances using the database
    1. Filtering settings
    2. Choice of the windows
    3. Definition of the logic
    4. Optimal thresholds
  4. Validation of the performances using real-world records

This work will be based on a literature survey and will consider the devices and patents of the main competitors of Siemens (SEL and ABB) which are very active in this topic.

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