Research of controlled switching strategy to restrain inrush current during the energisation of converter transformer

Wang, Duo; Hao, Zhiguo; Hui, Zijia; Wang, Ke; Ding, Guangfei

doi:10.1049/joe.2018.8694

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…The resultant inrush currents typically approximate the no-load current of the transformer. D. Wang et al [8] introduced a controlled switching strategy to mitigate transients in the Nelson River Bi-pole III HVDC system, which experiences voltage depression due to random charging of the 500/230 kV 1200 MVA converter transformer in connection with a weak AC system. Their controller includes residual flux measurement capability to reduce inrush currents to acceptable levels, alleviating voltage depression.…”

Section: Introductionmentioning

confidence: 99%

A Novel Integrated Switching Strategy for Reliable Starting of Two Terminal MMC HVDC Transmission System

Mohammedirfan I Siddiqui

2024

jes

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If the initialization protocol of the Modular Multilevel Converter (MMC) system is not adhered to, the primary winding of the system transformer will experience a surge in inrush current, while the secondary winding on the converter side will exhibit significant starting current draw to charge the capacitors of the MMC-H-bridge. This pronounced initial current surge can trigger the activation of protective measures, leading to the disconnection of the High Voltage Direct Current (HVDC) line and thereby engendering power system reliability and stability concerns. This paper presents a starting methodology for a two-terminal MMC HVDC system. The proposed approach entails employing controlled switching techniques to mitigate inrush currents in the HVDC converter transformer, coupled with the utilization of pre-insertion resistance circuit breakers to diminish starting currents on the converter side. The efficacy of the aforementioned strategy is validated through simulations conducted on a two-terminal MMC HVDC system modeled using PSCAD/EMTDC, with the results confirming its effectiveness.

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Section: Introductionmentioning

confidence: 99%