Open AccessAdaptive fault recovery strategy of LCC‐MMC based hybrid HVDC
Author(s) -
Sayed Tassawar Hussain Kazmi,
Song Guobing,
Wang Ting,
Hou Junjie,
Masood Bilal
Publication year - 2021
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/gtd2.12186
Subject(s) - fault (geology) , rectifier (neural networks) , transient recovery voltage , converters , transient (computer programming) , engineering , modular design , inverter , line (geometry) , circuit breaker , voltage , control theory (sociology) , hvdc converter station , transmission system , transient voltage suppressor , electronic engineering , computer science , voltage source , transmission (telecommunications) , electrical engineering , artificial neural network , control (management) , stochastic neural network , geometry , mathematics , machine learning , artificial intelligence , seismology , recurrent neural network , dropout voltage , geology , operating system
Hybrid HVDC consisting of line commutated converter (LCC) on rectifier side and modular multilevel converter (MMC) on inverter side is the favourable future trend of HVDC projects utilising the advantages of both converter technologies. However, fault clearing and adaptive restart capabilities of such hybrid HVDC are not much investigated in the literature. In this paper fault clearing of hybrid HVDC transmission line is investigated using mechanical DC breaker at MMC terminal and forced firing angle retardation at LCC terminal. Then, the characteristics of the line voltages are analysed during the fault blocking states of converters to clear the transient fault. Characteristics of the line voltages of LLC rectifier have shown prominent difference under permanent and temporary fault states, and also dependent on the severity of fault. Therefore, based on line voltage characteristics, a restart strategy is proposed for hybrid HVDC which is adaptive to the fault characteristics. Several PSCAD/EMTDC based simulation studies are conducted to validate the proposed fault recovery strategy. Simulation results validate the effectiveness of the proposed strategy for hybrid HVDC under DC line faults.