Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Experience and Analysis of Pole Interaction for Jeju HVDC No. 2: Practical Solution for Non-Interruptible Power Transfer
Authors Hee-Jin Kim ; Chan-Ki Kim ; Chang-Hwan Park
DOI 10.6113/TKPE.2020.25.6.459
Page pp.459-468
ISSN 1229-2214
Keywords Jeju HVDC No. 2; LCC-HVDC; Pole interaction
Abstract The pole interaction of the line-commutated converter high-voltage direct current (HVDC) is analyzed, and a practical solution that uses a surge arrester is proposed. Jeju HVDC No. 2 is a double-monopole HVDC link that has a rated power capacity of 2 × 200 MW and was commissioned in 2012. During normal operation, Jeju HVDC No. 2 is operated in the bipolar mode to minimize the loss caused by the dedicated metallic return. However, when one pole of the inverter valve is bypassed, a commutation failure can occur in the other pole. This phenomenon is called pole interaction in this work. This pole interaction interrupts the HVDC power transfer for almost 2 s and may affect the stability of the power system. This research proposes the installation of a surge arrester at the inverter neutral, which can be an effective and practical solution for pole interaction. The HVDC system is analyzed, and the residual voltage of the surge arrester is determined. Detailed simulation using PSCAD/EMTDC demonstrates that the proposed method eliminates the pole interaction of the bipolar-operated HVDC.