A Novel Coordinated Control Approach for Commutation Failure Mitigation in Hybrid Parallel-HVDC System with MMC-HVDC and LCC-HVDC

This paper proposes a novel coordinated control approach for the hybrid parallel-HVDC system that is composed of a line commutated converter-based high-voltage direct current (LCC-HVDC) link and a modular multi-level converter-based HVDC (MMC-HVDC) link in parallel. With the presented control approa...

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Bibliographic Details
Published inElectric power components and systems Vol. 45; no. 16; pp. 1773 - 1782
Main Authors Guo, Chunyi, Yang, Zhizhong, Ning, Linru, Zhao, Chengyong
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 02.10.2017
Taylor & Francis Ltd
Subjects
Commutation
commutation failure
commutation failure immunity index
commutation failure probability
Control systems
Converters
coordinated control
Direct current
Failure
fault recovery performance
fault recovery time
Faults
Hybrid parallel-HVDC
Hybrid systems
Immunity
LCC-HVDC
MMC-HVDC
Reactive power
reactive power control
Recovery time
VSC-HVDC
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Summary:This paper proposes a novel coordinated control approach for the hybrid parallel-HVDC system that is composed of a line commutated converter-based high-voltage direct current (LCC-HVDC) link and a modular multi-level converter-based HVDC (MMC-HVDC) link in parallel. With the presented control approach, the reactive power of MMC-HVDC is regulated flexibly based on the extinction angle of LCC-HVDC to mitigate the commutation failure of LCC-HVDC and improve the fault recovery performances of the overall system during fault and post-fault periods. A hybrid parallel-HVDC system is developed in PSCAD/EMTDC to evaluate the effects of the proposed control approach. The transient performances of the hybrid parallel-HVDC, under single-phase and three-phase to ground faults at the inverter AC busbar are investigated. Commutation failure immunity index (CFII) and fault recovery time are used as measures to evaluate the effects of the proposed control approach. The results show that the proposed coordinated control approach can make the LCC-HVDC less susceptible to commutation failure in hybrid parallel-HVDC system and effectively improve the fault recovery performances of the overall system.
ISSN:1532-5008
1532-5016
DOI:10.1080/15325008.2017.1377786