Browsing by Keyword "Protection algorithm"
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Item A comparison of non-unit and unit protection algorithms for HVDC grids(Institute of Electrical and Electronics Engineers Inc., 2019-05) Perez-Molina, Maria Jose; Larruskain, Dunixe Marene; Lopez, Pablo Eguia; Abarrategi, Oihane; Santos-Mugica, Maider; POWER SYSTEMSFrom a prospect where High Voltage Direct Current systems are the most promising alternative for new grid expansion as well as for integration of renewable energies at worldwide level, this paper analyses DC protection systems and their challenges on detecting and clearing faults. The focus of this paper is a comparison between non-unit and unit protection systems. It is also presented a study case with a simple non-unit algorithm, which is enhanced with a communication system.Item Evaluation of a Local Fault Detection Algorithm for HVDC Systems(2019-07) Perez Molina, M.J.; Eguia Lopez, P.; Larruskain Eskobal, M.; Santos Mugica, M.; Rodriguez Sanchez, R.; POWER SYSTEMS; Tecnalia Research & InnovationA great increase in the amount of energy generated from clean and renewable sources integrated in the electric power system is expected worldwide in the coming years. High Voltage Direct Current (HVDC) systems are seen as a promising alternative to the traditional Alternating Current (AC) systems for the expansion of the electric power system. However, to achieve this vision, there are some remaining challenges regarding HVDC systems which need to be solved. One of the main challenges is related to fault detection and location in HVDC grids. This paper reviews the main protection algorithms available and presents the evaluation of a local fault detection algorithm for DC faults in a multi-terminal Voltage Source Conversion (VSC) based HVDC grid. The paper analyses the influence of the DC voltage sampling frequency and the cable length in the performance of the algorithm. © 2019, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ).