A PPT ON STATCOM for mitigation of voltage dip and voltage flickering problems in Power System
Power quality in distribution system has been the major issue now-a-days. Utility distribution networks, sensitive industrial loads and critical commercial operations suffer from various types of power quality problems like voltage sag, voltage flickering, service interruptions and harmonics. A voltage dip is a short time (10 ms to 1 minute) event during which a reduction in r.m.s voltage magnitude occurs. It is often set only by two parameters, depth/magnitude and duration.
The voltage dip magnitude is ranged from 10% to 90% of nominal voltage (which corresponds to 90% to 10% remaining voltage) and with a duration from half a cycle to 1 min. In a three-phase system a voltage dip is by nature a three-phase phenomenon, which affects both the phase-to-ground and phase-to-phase voltages. A voltage dip is caused by a fault in the utility system, a fault within the customer’s facility or a large increase of the load current, like starting a motor or transformer energizing. The high current results in a voltage drop over the network impedance -. Another power quality problem which is discussed in this paper is Voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by large rapid industrial load changes. Erratic variations in reactive power demands lead to fluctuating voltage drops across the impedance of a distribution system which results in voltage flicker.
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