Novel detection scheme for commutation failure based on virtual blocking state

Yin, Shanshan; Li, Xiaohua; Li, Hao; Cai, Zexiang; Zhang, Jingyi

doi:10.1016/j.ijepes.2021.107789

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…(5) Compare the virtual conduction width of each valve t HVTm with the conduction width of the normal operating valve t HVT_normal . If there is a converter valve t HVTm > t HVT_normal ± ε (ε is measurement error, reference [22]), the state of the valve is abnormal. Record the number of the converter valve n and the abnormal time of the converter valve at this time t s1 , Then, proceed to step (6).…”

Section: B Fault Phase Locationmentioning

confidence: 99%

A Location Method for AC Fault in LCC-HVDC System Based on Virtual Conduction Width Characteristics

Yin

2023

IEEE Access

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When an AC fault occurs in HVDC transmission system, the transient response change in the rate of change of current and voltage, which may lead to the unexpected action behavior of converter protection. This is attributed to the electrical quantity similarities between internal and external faults, leading to difficulties in fault location identification and reducing the sensitivity in protection measure activation. To realize internal and external fault identification and quickly deal with external faults, an AC fault detection method for LCC-HVDC systems based on virtual conduction width characteristics is proposed. First, by utilizing the ratio integral of the three-phase AC current on the valve side to the reference current, the virtual conduction width flowing through each valve in the sampling window is calculated. Second, according to the size relationship among virtual conduction widths, internal and external faults are identified. Third, after determining the external faults, the difference in the virtual conduction width for each valve branch in the sampling window is calculated to locate the fault phase. Finally, the simulation results based on EMTDC/PSCAD show that the proposed method can quickly identify internal and external faults and locate fault phases and is not affected by fault moment and fault resistance.

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Section: B Fault Phase Locationmentioning

confidence: 99%

A Location Method for AC Fault in LCC-HVDC System Based on Virtual Conduction Width Characteristics

Yin

2023

IEEE Access

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“…In terms of the critical criterions for CF identification used to estimate whether CF occurs or not, the existing approaches can be broadly classified into four categories: the critical extinction angle, the minimum voltage reduction, the critical commutation voltage area, and the differential current of AC-DC current (AC-DC criterion) used in the actual projects [7].…”

Section: Introductionmentioning

confidence: 99%

Improved Identification Method and Fault Current Limiting Strategy for Commutation Failure in LCC-HVDC

Liu

Lin

Zhong

et al. 2022

Journal of Modern Power Systems and Clean Energy

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Line-commutated converter based high-voltage direct-current (LCC-HVDC) transmission systems are prone to subsequent commutation failure (SCF), which consequently leads to the forced blocking of HVDC links, affecting the operation of the power system. An accurate commutation failure (CF) identification is fairly vital to the prevention of SCF. However, the existing CF identification methods cause CF misjudge or detection lag, which can limit the effect of SCF mitigation strategy. In addition, earlier approaches to suppress SCF do not clarify the key factor that determines the evolution of extinction angle during system recovery and neglect the influence. Hence, this paper firstly analyzes the normal commutation process and CF feature based on the evolution topology of converter valve conduction in detail. Secondly, the energy in the leakage inductance of converter transformer is presented to characterize the commutation state of the valves. Then a CF identification method is proposed utilizing the leakage inductance energy. Thirdly, taking the key variable which is crucial to the tendency of extinction angle during the recovery process into account, a fault current limiting strategy for SCF mitigation is put forward. Compared with the original methods, the proposed methods have a better performance in CF identification and mitigation in terms of detection accuracy and mitigation effect. Finally, case study on PSCAD/EMTDC validates the proposed methods.

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Design of hybrid series converter valve considering device switching characteristics

Zhan

Xia

et al. 2022

International Journal of Electrical Power & Energy Systems

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Novel detection scheme for commutation failure based on virtual blocking state

Cited by 7 publications

References 13 publications

A Location Method for AC Fault in LCC-HVDC System Based on Virtual Conduction Width Characteristics

A Location Method for AC Fault in LCC-HVDC System Based on Virtual Conduction Width Characteristics

Improved Identification Method and Fault Current Limiting Strategy for Commutation Failure in LCC-HVDC

Design of hybrid series converter valve considering device switching characteristics

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