Fault currents;
Circuit faults;
Voltage control;
Limiting;
Capacitors;
Fault detection;
Inductance;
Modular multilevel converters (MMC);
DC grid;
DC circuit breaker (DCCB);
DC fault;
HVDC transmission;
PROTECTION SCHEME;
D O I:
10.1109/TPWRD.2020.2997089
中图分类号:
TM [电工技术];
TN [电子技术、通信技术];
学科分类号:
0808 ;
0809 ;
摘要:
This paper proposes an adaptive fault current limiting control (AFCLC) for modular multilevel converters (MMC). Without introducing extra current limiting devices, this control scheme enables fast fault current suppression during DC faults. The AFCLC will be triggered automatically once DC faults occur. By adaptively reducing the output DC voltages of MMCs, the fault current can be suppressed. Compared with the existing current limiting methods, the proposed AFCLC has a better performance on fault current limiting, since it only depends on the real-time operating condition and no fault detection delay is imposed. Firstly, the principle of the proposed AFCLC together with the mathematical analysis is disclosed. Then, the sensitivity analysis of the impact of key control parameters on the current limiting effect is investigated. Finally, the effectiveness of AFCLC is demonstrated in a four-terminal HVDC grid test model. The simulation results show that the proposed AFCLC can reduce the interrupted current and energy absorption of a DCCB from 10.39 kA and 38.24 MJ to 4.62 kA and 8.32 MJ, respectively. The simulation results also prove that the AFCLC will not affect the accuracy of the DC fault detection algorithms under DC faults.
机构:
Global Energy Interconnect Res Inst, Beijing, Peoples R ChinaGlobal Energy Interconnect Res Inst, Beijing, Peoples R China
An, Ting
;
Tang, Guangfu
论文数: 0引用数: 0
h-index: 0
机构:
Global Energy Interconnect Res Inst, Beijing, Peoples R ChinaGlobal Energy Interconnect Res Inst, Beijing, Peoples R China
Tang, Guangfu
;
Wang, Weinan
论文数: 0引用数: 0
h-index: 0
机构:
Global Energy Interconnect Res Inst, Beijing, Peoples R China
North China Elect Power Univ, Beijing, Peoples R ChinaGlobal Energy Interconnect Res Inst, Beijing, Peoples R China
机构:
Global Energy Interconnect Res Inst, Beijing, Peoples R ChinaGlobal Energy Interconnect Res Inst, Beijing, Peoples R China
An, Ting
;
Tang, Guangfu
论文数: 0引用数: 0
h-index: 0
机构:
Global Energy Interconnect Res Inst, Beijing, Peoples R ChinaGlobal Energy Interconnect Res Inst, Beijing, Peoples R China
Tang, Guangfu
;
Wang, Weinan
论文数: 0引用数: 0
h-index: 0
机构:
Global Energy Interconnect Res Inst, Beijing, Peoples R China
North China Elect Power Univ, Beijing, Peoples R ChinaGlobal Energy Interconnect Res Inst, Beijing, Peoples R China