Browsing by Keyword "VSC"
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Item Fault detection based on ROCOV in a multi-terminal HVDC grid(European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2020) Perez-Molina, M.J.; Eguia-Lopez, P.; Larruskain-Eskobal, M.; Etxegarai-Madina, A.; Apiñaniz Apiñaniz, S.Protection of a meshed VSC-HVDC grid is a challenge due to the behaviour of DC current and voltage signals during fault conditions. Protection systems must operate in a very short time range. Since fault detection should be very fast, local measurement based algorithms are mostly used; communication based algorithms lack the needed speed as a result of the communication time delay. This way, a ROCOV algorithm is proposed in this paper. This algorithm is analysed for different fault conditions.Item Impact of proportional resonant controller parameters of VSC connected to AC grids with variable X/R characteristic on the small signal stability(2020-06) Haro-Larrode, Marta; Santos-Mugica, Maider; Eguia, Pablo; Rodriguez-Sanchez, Raul; Gil-de-Muro, Asier; Tecnalia Research & Innovation; POWER SYSTEMS; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe purpose of this paper is to assess the impact of proportional resonant controller (PR) parameters of a Voltage Source Converter (VSC) and AC grid topology on the small signal stability of a VSC-AC system. Based on this, a small signal model is constructed, step by step, and validated against EMT simulations. Following this validation, several scenarios containing different PR controller gains are proposed and compared by means of trajectory of eigenvalues. A discussion of the best adequacy of PR controller parameters and AC grid strength in combination with inductive-resistive characteristic (X/R) is developed to ensure the stability of the system. The previous eigenvalue analysis is verified in time domain by means of EMT simulations. The analysis performed concludes that, while the AC grid strength in combination with PR controller parameters plays an important role in determination of stability, variations in the inductive-resistive AC grid characteristic need to be included in the analysis, since further instabilities can appear even when the PR controller is well designed for a specific AC grid configuration.