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In the modern industrial world most electronic and electrical control devices are characterized by an extreme sensitivity on power quality variations. Voltage sag is defined as a short duration reduction in voltage magnitude and is considered to be the most serious power quality issue. The accuracy limits of an index used for predicting the magnitude and duration of voltage sag caused by an increase...
A new methodology for power system quality improvement, through voltage sags profile prediction is proposed in this paper. The voltage sag is caused by an increase in reactive demand due to induction motor starting. The methodology is investigated with the use of a four bus interconnected system. Mathematical and simulation results demonstrate the accuracy and applicability of the proposed methodology...
A new quadratic voltage index based on power flow equations is proposed in this paper. The index supervises the power quality of a system, through predicting voltage sags. The voltage sag is caused by an increase in reactive demand due to induction motor starting. The index has been tested for a range of X/R ratios and various loading levels. Mathematical and simulation results demonstrate the effectiveness...
A new set of voltage sag indices based on conventional power flow equations is proposed in this paper to supervise the power quality of a system through predicting voltage sags. The developed mathematical indices are verified for various modes of motor operation and loadings levels through simulation using PSCAD.
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