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

Liu, Jian; Lin, Sheng; Zhong, Wenliang; Liu, Lei

doi:10.35833/mpce.2021.000715

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…This can improve the dynamic reactive power support capability. In [26] and [27], a DC current limited method is proposed. While it can suppress SCF effectively, it also leads to a slow recovery.…”

Section: ⅰ Introductionmentioning

confidence: 99%

A Novel Recovery Strategy to Suppress Subsequent Commutation Failure in an LCC-Based HVDC

Su,

Yin,

et al. 2024

Prot. Control Mod. Power Syst.

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A subsequent commutation failure (SCF) can easily occur during the recovery process after a first commutation failure (1st CF). This paper analyzes the interaction mechanism of extinction angle, AC voltage, DC current and firing angle, and reveals that the complex coupling relationship during the dynamic process after the 1st CF has a significant effect on the SCF. The mathematical equations when considering different fault durations, fault severities and AC system strengths are then established. An AC fault voltage detection method based on reactive power and fault duration is also proposed to measure the fault severity, and an SCF inhibition control strategy (SCFICS) based on AC fault detection and reactive power control is subsequently proposed. This can not only inhibit the SCF, but also enhance the DC recovery speed effectively. Finally, based on the SCFICS, a simulation model is built, and the simulation results with different cases indicate that the SCFICS can effectively inhibit the SCF with good recovery performance, for three-phase-to-ground (TPG) and single-phase-to-ground faults, and with a fault inductance range of 0.01 H to 1 H.

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Section: ⅰ Introductionmentioning

confidence: 99%

A Novel Recovery Strategy to Suppress Subsequent Commutation Failure in an LCC-Based HVDC

Su,

Yin,

et al. 2024

Prot. Control Mod. Power Syst.

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“…[22]. Compared with the critical voltage, the critical commutation voltage area method not only judged from the amplitude drop but also considered phase deviation [23]. Under the condition of DC current fluctuation after the AC system fault, Liu et al [24] considered the commutation area criterion and improved the critical commutation area method.…”

Section: Introductionmentioning

confidence: 99%

A fast and high‐accurate commutation failure identification method for LCC‐HVDC system

Feng,

Liu,

et al. 2024

High Voltage

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Commutation failure (CF) is one of the most common issues in line‐commuted converter‐based high voltage direct current systems (LCC‐HVDC), leading to critical power system security and stability problems. Accurate and rapid identification of CF is crucial to prevent subsequent CF in HVDC systems. However, the existing CF identification methods are lack of the required accuracy and speed. The relationship between bridge arm current, commutation voltage, and trigger pulse based on the commutation progress mechanism after the AC fault is analysed in this paper. A novel CF identification method is presented, which utilises the CF identification factor, enabling fast and high‐accurate identification without relying on the value of the extinction angle. The proposed method offers a simpler and more efficient implementation in engineering practice. Finally, the effectiveness of the proposed method is verified in both the standard International Council on Large Electric systems HVDC model and the Hardware in Loop test using practical project parameters. The results demonstrate that the proposed method can accurately and fast identify CF.

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“…The transmission line is the component with the highest fault probability, and line faults affect the whole HVDC system. Therefore, the rapid removal of faults is crucial to the enhancement of the transient stability of power systems [5][6][7][8]. Currently, fault identification methods for HVDC transmission lines can be summarized into the following two schemes: Time domain characteristics based on methods: Traditional time domain schemes typically utilize the transient characteristics of voltage traveling wave attenuation caused by boundaries composed of smoothing reactors at both ends of the line, such as traditional methods of voltage change rate [9,10].…”

Section: Introductionmentioning

confidence: 99%

Convolution Power Ratio Based on Single-Ended Protection Scheme for HVDC Transmission Lines

Peng,

Chen,

et al. 2023

Electronics

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In order to solve the problems of insufficient abilities to withstand transition resistance under remote faults and difficulties in identifying internal and external faults for HVDC transmission line protection, a new single-ended protection scheme based on time-domain convolutional power was proposed. In this scheme, the ratio of time-domain convolution power at different frequencies is used to detect internal and external faults, and the long window convolution power is used to form the pole selection criteria. Due to the integration of transient power fault characteristics at high and low frequencies, this scheme amplifies the characteristic differences between internal and external faults caused by DC line boundaries and has a strong ability to withstand transition resistance. Based on PSCAD/EMTDC, simulation verification was conducted on the Yunnan–Guangzhou ±800 kV HVDC project. The results show that the proposed single-ended protection scheme can effectively identify fault poles, as well as internal and external faults. It has strong resistance to transition resistance and certain anti-interference ability and has strong adaptability to DC line boundaries, which meets the protection requirements of HVDC transmission systems for high speed, selectivity and reliability.

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

Cited by 7 publications

References 23 publications

A Novel Recovery Strategy to Suppress Subsequent Commutation Failure in an LCC-Based HVDC

A Novel Recovery Strategy to Suppress Subsequent Commutation Failure in an LCC-Based HVDC

A fast and high‐accurate commutation failure identification method for LCC‐HVDC system

Convolution Power Ratio Based on Single-Ended Protection Scheme for HVDC Transmission Lines

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