報告書番号

T94020

タイトル（和文）

自励式変換器を用いた直流送電の系統導入効果の解明

タイトル（英文）

PERFORMANCE IMPROVEMENT EFFECT OF HVDC SYSTEM WITH SELF-COMMUTATED CONVERTERS

概要 （図表や脚注は「報告書全文」に掲載しております）

直流送電の将来系統への導入形態を想定した交直併用送電モデル系統を対象に、自励式変換装置の適用による安定度制御方式の検討と輸送力向上効果の定量的把握、さらに実用化にむけての技術課題の抽出を行い、次のことを明らかにした。（１）自励式変換器の交流母線周波数を入力としたＰＱモジュレーション制御により、交直併用送電系統の過渡と動態を統合して安定化できる制御方式を考案した。（２）自励式の適用により系統全体の安定度が向上し、直流による送電分に加えて、並列する交流送電ルートの輸送力も大きく増加する。さらに、自励式直流多端子を実現した場合、各連系点での有効・無効電力制御が可能となるために２端子よりは安定度が向上する。（３）自励式の適用にあたっては、系統故障時の安定運転性能の向上が主要な技術課題であり、交流系故障時の運転継続制御方式、および直流系故障時の高速停止－再起動方式の開発を進める必要がある。

概要 （英文）

AN HVDC SYSTEM WITH SELF-COMMUTATED CONVERTERS HAS GOOD OPERATIONAL AND CONTROL PERFORMANCE COMPARED TO CONVENTIONAL LINE-COMMUTATED SYSTEMS. IT IMPROVES OVERALL AC/DC SYSTEM STABILITY AND HENCE INCREASES TRANSMISSION CAPABILITY. THEREFORE, THE EFFECT OF INSTALLING SELF-COMMUTATED SYSTEMS SHOULD BE EXAMINED TO CLARIFY EFFECTIVE SCHEMES FOR APPLYING HVDC SYSTEMS TO FUTURE POWER SYSTEMS. THIS REPORT PRESENTS A STABILITY CONTROL SCHEME FOR OVERALL AC/DC SYSTEMS BY APPLYING SELF-COMMUTATED CONVERTERS, AND EVALUATES THE TRANSMISSION CAPABILITY IMPROVEMENT USING THE CHAMPS-Y SIMULATION. FURTHERMORE, TECHNICAL SUBJECTS TO BE INVESTIGATED ARE ALSO DISCUSSED AS FOLLOWS (1)COMPREHENSIVE (TRANSIENT AND DYNAMIC) STABILITY CONTROL REALIZED BY PQ MODULATION WITH CONVERTER AC BUS FREQUENCY AS AN INPUT IS PROPOSED AND ITS EFFECTIVENESS WAS VERIFIED. (2)APPLICATION OF SELF-COMMUTATED CONVERTERS IMPROVES OVERALL SYSTEM STABILITY, AND INCREASES AC TRANSMISSION CAPABILITY AS WELL AS ENSURES STABLE DC TRANSMISSION. A MULTI-TERMINAL HVDC SYSTEMWITH SELF-COMMUTATED CONVERTERS CAN FURTHER IMPROVE STABILITY, BECAUSEPQ CONTROL FOR STABILIZATION IS POSSIBLE AT EACH INTERCONNECTED POINT.(3)THE MAIN TECHNICAL SUBJECT IS TO DEVELOP CONTROLS FOR ENSURING STABLE OPERATION IN VARIOUS SYSTEM FAULT CONDITIONS. DEVELOPMENT OF CONTINUOUS OPERATION CONTROL AT AN AC SYSTEM FAULT AND HIGH-SPEED STOP-RESTARTCONTROL AT A DC FAULT IS REQUIRED TO INSTALL SELF-COMMUTATED HVDC IN FUTURE TRUNK POWER SYSTEMS.

報告者

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