報告書番号

184032

タイトル（和文）

予防制御のための定態安定度判別手法

タイトル（英文）

STEADY STATE STABILITY AFTER SYSTEM FAULT CLEARANCE

概要 （図表や脚注は「報告書全文」に掲載しております）

本報告は，固有値解析の応用として，想定故障除去後の定態安定度を精度良くかつ簡便に判定する手法を開発，検証したものであり，これにより予防制御のための安定度評価が大巾に効率化される。本手法は次の２つのステップから構成される。（１）発電機の慣性，磁束や制御系の時定数など系統の動的要因を除外して静特性表現とすることにより，安定な場合に動揺が収束すべき運転点を求める。（２）一旦除外した動的諸要因を再び附加し，上記運転点の廻りで線形表現する。線形表示された系統に対し固有値解析を実施する。電力系統が不安定となる場合には，故障除去後長時間たっても動揺が収束せず，最終的に脱調に至るなど，長時間のシミュレーション解析を要しているものがある。本手法によればこれらの現象を１／３０以下の計算時間で解析することができる。

概要 （英文）

POWER SYSTEM INSTABILITY CAUSED BY THE DISTURBANCE SUCH AS THE TRANSMISSION LINE FAULT OR THE GENERATION PLANT TRIPIS ROUGHLY CLASSIFIED INTO THE FOLLOWING TWO TYPICAL PATTERNS. 1)INITIAL POWER SWING CAUSED BY THE DISTURBANCE IS TOO BIG TO KEEP THE SYSTEM IN THE TRANSIENT STABLE REGION. 2)INITIAL POWER SWING IS NOT SO BIG BUTIT DOES NOT CONVERGE FOR A LONG TIME AFTER THE FAULT CLEARANCE AND THEFINAL SYSTEM GETS TO BE INSTABLE. UP TO THE PRESENT,BOTH PHENOMENA HAVE BEEN ANALYZED BY THE SIMULATION WHICH NEEDS A RELATIVELY LONG COMPUTATION TIME ESPECIALLY IN THE CASE OF PATTERN 2). THIS PAPER DESCRIBES THE NEW THEORY TO JUDGE THE STABILITY CONCERNING TO THE PATTERN 2)USING NO SIMULATION TECHNIQUE AND VERIFIES ITS ACCURACY BY THE COMPARISON WITHTHE SIMULATION RESULTS. 1.OUTLINE OF THE NEW THEORY. THE NEW THEORY CONSISTS OF THE FOLLOWING TWO STEPS. 1)DYNAMIC FACTORS SUCH AS THE INERTIA OF GENERATOR ROTORS,THE TIME DELAY OF THE FLUX CHANGE AND THE TIME CONSTANTS OF THE CONTROL SYSTEMS ARE ELIMINATED FROM THE SYSTEM EQUATION.THE FINAL SYSTEM CONDITION TO BE REACHED IN THE CASE OF BEING STABLE IS PRECISELY CALCULATED BY THE NEWTON-RAPHSON TYPE LOAD FLOW CALCULATIONWHICH INCLUDES THE D-Q AXIS IMPEDANCE OF THE GENERATOR,THE NONLINEAR GAIN OF THE CONTROL SYSTEM,LOAD CHARACTERISTICS,ETC. 2)ELIMINATED DYNAMIC FACTORS ARE RE-ADDED TO THE SYSTEM EQUATION. THE SYSTEM EQUATION IS LINEARIZED AROUND THE ABOVE-MENTIONED HYPOTHETICAL OPERATING POINT. FASTEIGENVALUE ANALYSIS IS CARRIED OUT TO THE LINEARIZED SYSTEM EQUATION. 2.APPLICATION RESULTS. THE REMARKABLE FEATURES OF THE NEW THEORY ARE REPRESENTED BY THE SEVERAL APPLICATION RESULTS USING THE MODEL SYSTEM. 1)THE COMPARISON WITH THE SIMULATED RESULTS VERIFIES THE SUFFICIENT ACCURACY OF THE NEW METHOD. 2)THE COMPUTATION TIME OF THE NEW METHOD IS LESSTHAN 1/30 OF THAT OF THE SIMULATION ANALYSIS IN THE CASE WHERE THE NEGATIVE OR POOR DAMPING PHENOMENA IS TO BE CHECKED.

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