Universiti Teknologi Malaysia Institutional Repository

A fault current limiting approach for commutation failure prevention in LCC-HVDC transmission systems

Mirsaeidi, Sohrab and Dong, Xinzhou and Mat Said, Dalila (2019) A fault current limiting approach for commutation failure prevention in LCC-HVDC transmission systems. IEEE Transactions on Power Delivery, 34 (5). pp. 2018-2027. ISSN 0885-8977

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Official URL: http://dx.doi.org/10.1109/TPWRD.2019.2907558


Commutation failure is one of the most frequent failures in line-commutated converter based high-voltage direct-current (LCC-HVdc) systems which may lead to the outage of HVdc links, and thus affect the performance of the power system. Most commutation failures are caused by voltage reduction due to ac system faults. In this paper, a commutation failure prevention module (CFPM) is developed, which inserts the optimal value of resistance proportional to the reduced extinction angle in series with the fault current path using a simple switching method. When a fault occurs at the inverter ac side, a self turn-off switch starts switching with a pre-specified frequency and controlled modulation index, which limits the fault current to the desired value and inhibits commutation failure. The salient feature of the proposed CFPM is that it is fully controllable. In addition, despite the available controller modification methods which are not effective for low-impedance faults, the proposed CFPM can prevent commutation failure regardless of the fault severity. The practical performance and feasibility of the developed CFPM is validated through laboratory testing, using the real-time Opal-RT hardware prototyping platform. The experimental results demonstrate that the proposed strategy can effectively eliminate the commutation failure or repetitive commutation failures under different fault types.

Item Type:Article
Uncontrolled Keywords:AC faults, commutation failure
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:89285
Deposited By: Yanti Mohd Shah
Deposited On:22 Feb 2021 14:01
Last Modified:22 Feb 2021 14:01

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