Interactions and Countermeasures of AC-DC Interconnected System with Large Capacity Thermal Power Plants in the Vicinity

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  • 大容量火力発電所に連接する交直連系系統の相互作用と対策
  • ダイヨウリョウ カリョク ハツデンショ ニ レンセツスル コウチョクレンケイ

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Abstract

The large capacity (1400MW) HVDC Link connecting Shikoku and Kansai is under construction to be commissioned in the year of 2000. Its significant features include (1) largest converter capacity ever made in Japan, (2) hybrid mode system configuration in parallel with 500kV AC trunk lines and (3) possibility for an islanded transmission mode with direct connection to the large thermal power plant. Since this HVDC is large in its capacity and plays significant roles in the 60Hz power systems, studies and countermeasures on various subjects arising from AC/DC interaction phenomena are very important. This paper describes mechanisms, analysis results and countermeasures for AC overvoltages, harmonic instability, DC power oscillation and SSTI (turbine-generator subsynchronous torsional interactions) which take place based on AC and DC interactions.

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