The On-site Verification of Key Technologies for Kunbei-Liuzhou-Longmen Hybrid Multi-terminal Ultra HVDC Project

Hybrid high voltage direct current transmission (Hybrid HVDC) is a new type of HVDC technology developed in recent years. It combines the characteristics large-capacity and low cost line commutated converters (LCC) non-commutation failure dynamic reactive power support sourced (VSCs) one system. has technical advantages fields unidirectional application improving stability multi-infeed HVDCs, giving it broad prospects. The Kunbei-Liuzhou-Longmen (KBL) project first hybrid ultra project. was put into service on Dec. 27 th , 2020. This paper introduces KBL project, analyzes operation system, provides on-site verification including LCC-VSC ultra-high VSC using series two valve groups, DC fault ride-though without breaker, connection disconnection third station, etc.