Wide area fault location for Multi-terminal HVDC using the distributed parameter line equations
The increasing development of multi-terminal high-voltage direct current (MTDC) lines due to the advantages of this type of network over the AC network, especially in long distances, has drawn more attention to providing a solution to protect and estimate the fault location in this type of network. In this paper, a method based on distributed parameters line equations is presented for fault location in an MTDC network. In the proposed method, it is assumed that the measuring instruments are installed only on the terminals connected to the converter. The proposed algorithm includes three parts: identifying the faulty pole, detecting the faulty line and estimating the fault location. To identify the faulty pole, the voltage change index is proposed. Identifying the faulty pole leads to reducing the number of times the algorithm is executed and speeding up the entire process of estimating the fault location. Faulty line detection algorithm is also divided into offline and online subsections. In the offline section, a concept called hypothetical lines is introduced according to the network structure. In the online section, using hypothetical lines and applying line equations, a method is proposed to identify faulty lines. Then using a two-ended method, the location of fault is estimated in this line. If the data is not available on at least one side of the line, it is estimated using the distributed parameter line equations. The studied network includes overhead and cable lines and radial and ring structures so that the accuracy of the proposed method can be checked in all cases. The results of the simulations show the proper performance of the proposed method for various faults, including faults near the end of long lines and faults with high resistance.
-
Precise Hybrid Method for Solving the Selectivity Problem of Overcurrent Relays due to PV Uncertainty
Faeze Mohajer, Hossein Kazemi Kargar *, Ahmad Salemnia,
Research and Technology in Electrical Industry, Summer-Autumn 2024 -
A review on islanding detection methods compatible with advanced gird support functionalities on photovoltaic system methods
Ali Emadi, *, Reza Bakhshi-Jafarabadi
Electrical Asre Magazine,