Non-unit protection for long-distance LCC-HVDC transmission lines based on waveform characteristics of voltage travelling waves

Liu, Zhen; Gao, Houlei; Luo, Sibei

doi:10.1016/j.ijepes.2023.109079

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…4 (a). The corresponding admittance matrix Yπ_m is (11) The non-zero elements in the matrix are 00 0 0 0 0…”

Section: Resonance Characteristics Of Cascaded π-Type Lpmmentioning

confidence: 99%

“…Due to the low operating frequency and short transmission distance, the wavelength of the voltage is so small that it can be ignored. For the network with high frequency and long lines [10][11], such as high voltage direct current and half-wavelength AC transmission, the wavelength of the voltage accounts for a large proportion of the length of the transmission line [12][13][14]. Equivalent LPMs of these systems have significant errors.…”

Section: Introductionmentioning

confidence: 99%

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Determination Method of Cascaded Number for Lumped Parameter Models Oriented to Transmission Lines

QIN,

KUANG,

JIANG

et al. 2024

IEICE Trans. Electron.

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This paper proposes a determination method of the cascaded number for lumped parameter models (LPMs) of the transmission lines. The LPM is used to simulate long-distance transmission lines, and the cascaded number significantly impacts the simulation results. Currently, there is a lack of a system-level determination method of the cascaded number for LPMs. Based on the theoretical analysis and eigenvalue decomposition of network matrix, this paper discusses the error in resonance characteristics between distributed parameter model and LPMs. Moreover, it is deduced that optimal cascaded numbers of the cascaded π-type and T-type LPMs are the same, and the Г-type LPM has a lowest analog accuracy. The principle that the maximum simulation frequency is less than the first resonance frequency of each segment is presented. According to the principle, optimal cascaded numbers of cascaded π-type, T-type, and Г-type LPMs are obtained. The effectiveness of the proposed determination method is verified by simulation.

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“…4 (a). The corresponding admittance matrix Yπ_m is (11) The non-zero elements in the matrix are 00 0 0 0 0…”

Section: Resonance Characteristics Of Cascaded π-Type Lpmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination Method of Cascaded Number for Lumped Parameter Models Oriented to Transmission Lines

QIN,

KUANG,

JIANG

et al. 2024

IEICE Trans. Electron.

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show abstract

“…Using the rate of change of DC voltage (ROCOV)-based fault protection scheme proposed in reference [6], the superiority of the proposed scheme is verified through simulation comparison.…”

Section: Comparison Studiesmentioning

confidence: 99%

“…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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“…The monitoring and handling of faults in overhead transmission lines has been a difficult problem in the constructions of smart grids (Kwasi Anane et al, 2021;Shu et al, 2022;Zhao et al, 2022). Because of the long length and remoteness of transmission lines, the prevention of accidents requires considerable manpower and material resources for regular inspections and checks (Liu et al, 2023). Therefore, it is important to monitor the operation status of transmission lines in real time (Yang et al, 2017;Paul and Chang, 2019;Gao et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Converting energy from overhead transmission line vibrations using a low-frequency and low-amplitude harvester in a smart grid

Tan,

Li,

Zhang

et al. 2023

Front. Energy Res.

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Introduction: Overhead transmission line vibration is detrimental to the normal operation of the power grid. It is necessary to remotely monitor overhead transmission lines with sensors in normal operation, and sensors require a constant source of energy. Harvesting energy from transmission line vibrations is an excellent solution to power these sensors.Methods: A low-frequency and low-amplitude vibration energy harvester is proposed, analyzed, produced and experimented in this study. A main constituent of the energy harvester is an outer support, an inner support, four one-way bearings, a bevel gear system and a DC generator. The harvester converts the linear reciprocating motion of the line into reciprocating swing at first and then converts it into fixed-direction rotation. Theoretical analyses are conducted to determine the harvester performance factors. Finally, the harvester is fabricated and tested.Results: The test results are in good accordance with the simulation results. At the vibrating speed as 0.48 m/s, the maximum output power and output voltage are 4.2 W and 24.7 V, respectively. The weather sensor and video recorder installed on the transmission line are powered by the harvester.Discussion: The energy harvester also effectively suppresses the vibration of transmission lines and has great potential in the constructions of smart grids. The harvester provides a feasible solution for harvesting line vibration energy and suppressing line breeze vibration simultaneously.

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Non-unit protection for long-distance LCC-HVDC transmission lines based on waveform characteristics of voltage travelling waves

Cited by 4 publications

References 23 publications

Determination Method of Cascaded Number for Lumped Parameter Models Oriented to Transmission Lines

Determination Method of Cascaded Number for Lumped Parameter Models Oriented to Transmission Lines

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

Converting energy from overhead transmission line vibrations using a low-frequency and low-amplitude harvester in a smart grid

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