Control and Protection Sequence of an Offshore Integrated MMC MTDC System with Master-Slave/Droop Cotrol under Converter AC-Side Fault
This paper investigates an offshore wind farm(OWF) integrated modular multilevel converter (MMC)-based HVDC system under an AC fault condition.This fault occurs at the AC-side of an MMC which performs as the master converter to maintain the DC voltage of the MTDC grid.Based on the systematic analysis under the fault condition, a comprehensive control and protection sequence, which includes (i) fault isolation;(ii) adjustment of the control mode of the MMCs; (iii) recovery of the unfaulted terminals, is proposed.Performance of the proposed scheme is evaluated using simulations on the real-time digital simulator (RTDS) platform.The simulation results demonstrate that the system is well protected following the fault, one of the unfaulted terminals takes over the role of the DC voltage control and then the unfaulted terminals resume in a smooth manner with small overvoltage and current surges using the proposed sequence.The control and protection sequence for MMC MTDC system with voltage droop control under the same fault condition is also discussed and validated on the RTDS.
Control and protection sequence Master converter-side AC fault Modular multilevel converter (MMC) Multi-terminal HVDC (MTDC) Offshore wind farm (OWF)
Puyu Wang Xiaoping Zhang Na Deng Paul F.Coventry Ray Zhang
School of Electronic Electrical and Systems Engineering, University of Birmingham, Edgbaston,Birming National Grid, National Grid House,Warwick Technology Park, Warwick, United Kingdom, CV34 6DA
国际会议
南京
英文
454-459
2015-09-21（万方平台首次上网日期，不代表论文的发表时间）