Open AccessImpact of Phase Locked Loop on Commutation Failure in LCC-HVDC
Author(s) -
Peiyuan Tang,
Xiaoming Yuan,
Jun Lu
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1887/1/012024
Subject(s) - commutation , phase locked loop , control theory (sociology) , hvdc converter , pll multibit , fault (geology) , power (physics) , process (computing) , control system , engineering , computer science , control (management) , electronic engineering , physics , voltage , electrical engineering , quantum mechanics , artificial intelligence , seismology , geology , jitter , operating system , transformer
Besides the DC faults, AC faults and faults in converter, the dynamic process of control system has its influence on commutation failure. As an important element in LCC-HVDC control system, PLL provides the reference phase of receiving end power system for valve control system. When there is a difference between the real phase of receiving end power system and the output from PLL, control system cannot adjust extinction angle accurately. In this paper, the function of PLL in HVDC control system and the characteristic of PLL’s tracking process are analysed. Then the influence of the phase error caused by PLL’s tracking process on the extinction angle is discussed. At last, a detailed LCC-HVDC model is used to prove the impact of PLL’s dynamic process on commutation failure and test the influence of PLL with different parameters on commutation failure.