報告書番号

T90014

タイトル（和文）

電圧安定性評価のための無効電力損失指標

タイトル（英文）

REACTIVE LTAGE STABILITY

概要 （図表や脚注は「報告書全文」に掲載しております）

最近，電力系統の電圧不安定現象が広く注目を集めており，系統電圧の安定性の程度を定量的に表す電圧安定性指標が内外で報告されている。電圧安定性と送電系統の無効電力損失との間には強い相関があり，無効電力損失が少ないほど電圧面から見た安定性は高い。本報告は，無効電力損失の大きさに着目した電圧安定性指標と電圧安定性との関係を定式化し，電圧安全性維持のための無効電力損失指標の上限を理論的に示したものである。また，電圧面から見た系統特性を改善させる方策のひとつとして負荷母線での系統切替があるが，その理想的負荷再配分は無効電力損失指標の極値問題として解けることを示した。

概要 （英文）

RECENTLY,PUNCH ATTENTION HAS BEEN PAID TO THE VOLTAGE-INSTABILITY PHENOMENON EMS IN JAPAN. TO CLARIFY THE BASIC CHARACTERISTICS OF THIS PHENOMENON AND TO EVALUATE VOLTAGE-INSTABILITY COUNTERMEASURES,CRIEPI HAS ALREADY DEVELOPED A SIMULATION PROGRAM TO ANALYZE THE BEHAVIOR OF BUS VOLTAGES,AND HAS CARRIED OUT DEMONSTRATION TESTSUSING THE CRIEPI POWER SYSTEM SIMULATOR. WE HAVE ALSO PRESENTED AN ON-LINE MONITORING INDEX THAT CAN EVALUATE THE VOLTAGE STABILITY AT EACH LOAD BUS IN A CONTROLLED AREA. HOWEVER,POWER SYSTEM PLANNERS AND OPERATORS REQUIRE A SIMPLER INDEX THAN THE PROPOSED INDEX TO ESTIMATE THE VOLTAGE SOUNDNESS OF AN ENTIRE POWER SYSTEM. THE PURPOSE OF THIS STUDY IS TO PRESENT A VOLTAGE-STABILITY INDEX BY PROCESSING THE REACTIVE POWER ION NETWORKS,AND TO EVALUATE THE VAR-LOSS INDEX THEORETICALLY AND QUANTITATIVELY. THE MAIN RESULTS ARE AS FOLLOWS: (1)A THEORETICAL RELATIONSHIPBETWEEN VOLTAGE INSTABILITY AND BEHAVIOR OF THE VAR-LOSS INDEX HAS BEEN FORMULATED. THE UPPER LIMIT OF THE VAR-LOSS INDEX REQUIRED TO KEEP THE VOLTAGE WITHIN A STABLE AREA HAS BEEN OBTAINED FROM THIS RELATIONSHIP. (2)IT HAS BEEN CLARIFIED THAT IDEAL LOAD DISPATCHING TO EACH LOAD BUSTO MAINTAIN A VOLTAGE-STABILITY THE VAR-LOSS INDEX PROBLEM. (3)THE EFFECT OF INSTALLATION SHUNT CAPACITORS AND/OR LOAD RE-DISPATCHING TO LOADBUSES E EVALUATED FROM THE COMPREHENSIVE VAR-LOSS INDEX COMPUTED FROM THE TOTAL VAR-LOSS ON ALL TRANSMISSION GE STABILITY CAN BE ESTIMATED BYLOCAL VAR-LOSS INDICES DEFINED FOR EACH LOAD BUS.

報告者

キーワード