Terminal voltage correlation-based adaptive reclosure strategy for VSC-MTDC grids

• Published in: International journal of electrical power & energy systems Vol. 142; p. 108378
• Main Authors: Ning, Jiaxing, He, Jinghan, Li, Meng, Nie, Ming, Jin, Xianing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2022
• Subjects: Adaptive reclosure; Marti model; Pearson correlation coefficient; Single-pole grounding fault; VSC-MTDC; VSC-MTDC; Marti model; Adaptive reclosure; Pearson correlation coefficient; Single-pole grounding fault
• ISSN: 0142-0615; 1879-3517
• DOI: 10.1016/j.ijepes.2022.108378

•The proposed strategy can not only identify permanent faults to avoid the second impact of short-circuit fault current, but also identify the arc extinction time of transient faults to optimize reclosing time. The detection error of the arc extinction time is less than 10 ms, with high detection precision.•Marti model, which takes the distributed and frequency-dependent characteristics of the line parameters into account, is used to calculate the transient value of the terminal voltage. The high-accuracy time-domain expression of the terminal voltage is derived.•The proposed strategy does not require additional devices or control strategies. The principle is simple and easy to implement with low cost.•Influencing factors such as transition resistance, fault location, noise, communication delay, distributed capacitance, etc. will not affect the reliability of the proposed strategy. Auto-reclosure in VSC-MTDC grids has the defect of blindly reclosing. Research on adaptive reclosure strategies capable of identifying fault property and arc extinction time is essential to promote the reliability of power supply. This paper proposes a novel adaptive reclosure strategy for VSC-MTDC grids. At first, the terminal voltage is derivated by Marti model, which takes the distributed and frequency-dependent characteristics of the line parameters into account. The calculation result of the terminal voltage achieves high accuracy. Subsequently, a main criterion exploiting Pearson correlation coefficient between the calculated terminal voltage and the actual terminal voltage on the faulty line is proposed for identifying the fault property and the arc extinction time. Moreover, an auxiliary criterion utilizing the steady-state amplitude of the terminal voltage is added to further ensure the identification reliability of fault property. Finally, the effectiveness of the adaptive reclosure strategy is verified in PSCAD/EMTDC. The influencing factors and advantages of the proposed strategy are discussed and compared.