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	スマートグリッドの状態推定	保護リレー協調
分野	電気工学	電気工学
系統	Process / pipeline	Process / pipeline
提唱年	1970s	1956
提唱者	Power systems engineering community	C. Russell Mason
種類	Computational pipeline	Computational pipeline
原典	Abur, A., & Exposito, A. G. (2004). Power System State Estimation: Theory and Implementation. Marcel Dekker.	Mason, C. R. (1956). The Art and Science of Protective Relaying. General Electric.
別名	state estimation, network state estimation, grid state assessment	relay coordination study, protection scheme design, selective overcurrent protection
関連	4	4
概要	Power system state estimation infers the real-time voltage and phase angle at every bus in a power network from redundant measurements of power flows and voltages. It is the foundation of modern grid operations, enabling real-time monitoring, contingency analysis, and optimal control. Advanced state estimation with synchronized phasor measurements (synchrophasors) enables faster control and detection of instabilities.	Protection relay coordination ensures that when a fault occurs, the relay nearest to the fault operates first, isolating only the faulted section while keeping healthy portions of the network energized. This selective clearing strategy minimizes service disruption and is achieved by carefully coordinating pickup currents and time delays across a series of relays. It is fundamental to reliable power system operation.