Boost inverter-based HVDC transmission system with inherent blocking capability of AC side contribution during DC side faults

A. Elserougi, A. M. Massoud, Ayman Abdel-Khalik, Shehab Ahmed

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Semiconductor advancements in the past three decades have positioned the voltage source converter-based HVDC (VSC-HVDC) solution as a practical and popular alternative to its line-commutated converter high voltage DC (LCC-HVDC) counterpart. The VSC-HVDC systems offer higher flexibility and system controllability features. One of the important challenges requiring careful investigation in such systems is the protection against DC side faults. Unfortunately, the VSC is inherently defenseless against such faults (DC link short circuit or DC cable short circuit). This paper proposes an HVDC system topology, namely, the boost inverter-based HVDC system (BI-HVDC), which provides complete blocking capability between the AC grid and the DC side fault. This blocking capability limits the DC fault current level to the DC capacitor discharge current. Ratings and characteristics of the proposed system compared to other existing topologies are highlighted in this work. A simulation study is conducted to check the performance of the proposed system during normal as well as abnormal operating conditions. A comparison between the performance of the conventional 2-level VSC-HVDC and the proposed system during DC side faults is also presented. The simulation results elucidate a significant decrease in the DC fault current due to the blocking capability of the BI-HVDC system during DC side faults.

Original languageEnglish
Pages (from-to)12-23
Number of pages12
JournalElectric Power Systems Research
Volume116
DOIs
Publication statusPublished - 1 Nov 2014

Fingerprint

Electric fault currents
Electric potential
Short circuit currents
Topology
Controllability
Cables
Capacitors
Semiconductor materials

Keywords

  • Boost inverter-based HVDC system
  • DC fault blocking capability
  • DC side faults
  • Discharge current
  • Grid current contribution
  • HVDC Converters

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

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abstract = "Semiconductor advancements in the past three decades have positioned the voltage source converter-based HVDC (VSC-HVDC) solution as a practical and popular alternative to its line-commutated converter high voltage DC (LCC-HVDC) counterpart. The VSC-HVDC systems offer higher flexibility and system controllability features. One of the important challenges requiring careful investigation in such systems is the protection against DC side faults. Unfortunately, the VSC is inherently defenseless against such faults (DC link short circuit or DC cable short circuit). This paper proposes an HVDC system topology, namely, the boost inverter-based HVDC system (BI-HVDC), which provides complete blocking capability between the AC grid and the DC side fault. This blocking capability limits the DC fault current level to the DC capacitor discharge current. Ratings and characteristics of the proposed system compared to other existing topologies are highlighted in this work. A simulation study is conducted to check the performance of the proposed system during normal as well as abnormal operating conditions. A comparison between the performance of the conventional 2-level VSC-HVDC and the proposed system during DC side faults is also presented. The simulation results elucidate a significant decrease in the DC fault current due to the blocking capability of the BI-HVDC system during DC side faults.",
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AU - Ahmed, Shehab

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AB - Semiconductor advancements in the past three decades have positioned the voltage source converter-based HVDC (VSC-HVDC) solution as a practical and popular alternative to its line-commutated converter high voltage DC (LCC-HVDC) counterpart. The VSC-HVDC systems offer higher flexibility and system controllability features. One of the important challenges requiring careful investigation in such systems is the protection against DC side faults. Unfortunately, the VSC is inherently defenseless against such faults (DC link short circuit or DC cable short circuit). This paper proposes an HVDC system topology, namely, the boost inverter-based HVDC system (BI-HVDC), which provides complete blocking capability between the AC grid and the DC side fault. This blocking capability limits the DC fault current level to the DC capacitor discharge current. Ratings and characteristics of the proposed system compared to other existing topologies are highlighted in this work. A simulation study is conducted to check the performance of the proposed system during normal as well as abnormal operating conditions. A comparison between the performance of the conventional 2-level VSC-HVDC and the proposed system during DC side faults is also presented. The simulation results elucidate a significant decrease in the DC fault current due to the blocking capability of the BI-HVDC system during DC side faults.

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