부산대학교 도서관

Supervisory control and data capture are the traditional technologies employed by grid operators for situational awareness (SCADA).The State Estimation (SE) solution is derived from SCADA data. Only a few seconds before and after the failure of the transient waveforms may be recorded by the fault recorder. However, saving such a big volume of data is difficult. SCADA takes roughly four seconds to update steady-state data, but it can't help with dynamic power prediction, low frequency vibration, or fault investigation. SCADA system is well suited to enhance and probably replace Synchrophasor technology. Synchrophasor technology provides the following benefits over SCADA-Direct measurement (as opposed to indirect measurement) to computed values from SCADA data using a model-based SE solution), increased (10-60 samples per second) data with time-stamped data precise to tens of msec. Due to characteristics, PMU sampled data is ideally positioned can provide special issue on a micro basis on wide area of the power network. It will provide a simultaneous estimate of transmission line load (based on the angular variation between the sites) or an immediate estimate of power dynamic behavior (swings), both of which require real-time information.