NDLI: Enhanced line commutated converter with embedded fully controlled sub-modules to mitigate commutation failures in high voltage direct current systems

Content Provider	IET Digital Library
Author	Ni, Xiaojun Zhao, Chengyong Guo, Chunyi Liu, Hang Liu, Yuchao
Abstract	An enhanced line commutated converter (E-LCC) with embedded fully controlled sub-modules (SMs) to mitigate commutation failures (CFs) in high voltage direct current (HVDC) system is proposed in this study. The main feature of E-LCC is that each arm is composed of thyristor valves and series connected fully controlled SMs. The operation modes and voltage–current stresses of embedded SMs in E-LCC are studied. Then the control strategy, including the pre-charging scheme of SMs and the coordination control method between the thyristor valves and the SMs, is presented. On the basis of the derived equivalent commutation circuit of E-LCC-based HVDC (E-LCC-HVDC), the dynamic characteristics of the commutation process are investigated. Then, the impact of E-LCC-HVDC on CFs mitigation is theoretically analysed. To validate the proposed E-LCC-HVDC, the simulation study is conducted in the electromagnetic transient simulation program PSCAD/EMTDC. The results show that with the embedded SMs, the proposed E-LCC-HVDC has the ability to mitigate the CFs and alleviate the power interruption during the AC faults effectively. Furthermore, the theoretical analysis and the presented control method for E-LCC-HVDC are also validated.
Starting Page	198
Ending Page	206
Page Count	9
ISSN	17554535
Volume Number	9
e-ISSN	17554543
Issue Number	Issue 2, Feb (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/9/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0421
Journal	IET Power Electronics
Publisher Date	2016-02-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Fault Commutation Commutation Failure D.C. Transmission EMTDC Enhanced Line Commutated Converter High Voltage Direct Current System HVDC HVDC Power Converter Power Interruption PSCAD Thyristor Application Thyristor Valves Voltage–current Stresses
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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