Research on transmission line model based on phase‐mode transformation in HVDC system

Li, Xiaodong; Xu, Zheng; Lai, Qiuju; Zhang, Zheren

doi:10.1002/tee.23026

Cited by 2 publications

(3 citation statements)

References 15 publications

(25 reference statements)

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“…When solving the DC-side circuit, the coupled multi-phase transmission line is regarded as a multi-node element. Based on the phase-mode transformation, the nodal admittance matrix of the line Y l is expressed as [27]:…”

Section: Transmission Line Modelmentioning

confidence: 99%

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

2021

Energies

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The line-commutated converter (LCC)-based high voltage direct current (HVDC) technology has been widely applied on long-distance and bulk-capacity power transmission occasions. Due to the terrible interferences in the vicinity of communication lines, DC filters (DCFs) are always installed to mitigate the interferences within acceptable levels for almost all in-service overhead line transmission LCC-HVDC schemes. With the rapid development of the communication technology, however, the anti-interference capability of the telephone system has been remarkably improved. Thus, the original purpose of employing DCFs has been virtually absent, and the necessity of the DCFs shall be re-evaluated in sufficient depth not only for new LCC-HVDC projects, but also in the case of refurbishment of older projects. To demonstrate this constructive topic, this paper carries out a commercial ±800 kV/8000 MW LCC-HVDC project as an illustrative example to analyze and discuss those crucial aspects, which may influence the LCC-HVDC stable operation and reliability after removing the DCFs. Then, the paper studies the harmonic voltage/current stresses of the DC equipment, the DC loop low-order harmonic resonances, and the overvoltage under the switching surge and lightning stroke. Finally, it is concluded that the DCF elimination mainly affects the harmonic steady-state stresses of the DC equipment, but has little influence on the transient stresses. For the refurbishment of older projects, the evaluation on the cost between the DCFs’ maintenance cost and the equipment modification is needed for the DCFs’ elimination. For new LCC-HVDC projects, the DCFs’ elimination or at least simplification may be a more economical and attractive alternative, thereby reducing the footprint and cost.

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Section: Transmission Line Modelmentioning

confidence: 99%

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

2021

Energies

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“…Equivalent LPMs of these systems have significant errors. In these systems, transmission lines have been integrated with series impedance and parallel admittance, which is known as distributed parameter effect [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…However, this is still a considerable number. For example, for the 750kV/500 km lossless line in [16], 155 segment LPMs are required to simulate the transmission characteristics of 3000Hz. Reference [25] proposed a method for determining the cascaded numbers of cascaded π-type and T-type LPMs of lossless lines based on mathematical analysis.…”

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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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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Research on transmission line model based on phase‐mode transformation in HVDC system

Cited by 2 publications

References 15 publications

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

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

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