DC Voltage Control and OLTC Control Strategy for MMC-Based HVDC System Under SM Failure

The Modular multilevel converters (MMCs) have excellent performance when operated with high modulation index such as the case of gird-connected converters in high voltage direct current (HVDC) system. Reliable and fault tolerant operation (FTO) of the system is very important in HVDC. A novel FTO al...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.114325-114338
Main Authors: Richa, A., Beig, Abdul R., Jayashree, R.
Format: Article
Language:English
Subjects:
Algorithms
Capacitors
Circuit faults
Control systems
Converters
Direct current
Fault tolerance
Fault tolerant operation (FTO)
high voltage direct current (HVDC)
HVDC transmission
Metal matrix composites
modular multilevel converter (MMC)
multi-level converters (MLCs)
on load tap changer (OLTC)
Performance degradation
Pulse width modulation
pulse width modulation (PWM)
sub module (SM) failure
Switches
Tap changers
Voltage control
voltage source converters (VSC)
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Summary:The Modular multilevel converters (MMCs) have excellent performance when operated with high modulation index such as the case of gird-connected converters in high voltage direct current (HVDC) system. Reliable and fault tolerant operation (FTO) of the system is very important in HVDC. A novel FTO algorithm under sub module failure without using any additional redundant SMs is proposed. In the proposed method, the direct current bus voltage control and on-load tap changer (OLTC) control strategy are combined for interruption free operation of the system without any additional voltage stress on switching devices and performance degradation of the system during fault. The analytical details of the normal as well as FTO operation are given. The proposed FTO strategy is verified through simulation and also experimentally using a prototype. The simulation and experimental results are presented.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3102377