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This paper discusses the distance relay over-reaching due the presence of Thyristor Controlled Series Compensator (TCSC), one of the series connected Flexible Alternating Current Transmission System (FACTS) devices, considering its MOV operation. This is done by presenting the measured impedance at the relaying point in the presence of TCSC at the near end of the next line. The measured impedance...
Power quality has always been important for customers, but with increasing applications of electronic loads and controllers sensitive to the power quality, the subject has attracted renewed interest in recent times. Power quality encompasses several aspects. Voltage sags, transients, and momentary interruption of power together constitute 92% of the power quality problems encountered by typical industrial...
In this paper, a three-phase active power filter is presented to improve the power quality of a system which supplies a three-phase non-linear load. For this purpose, a three-phase voltage source inverter bridge with a DC bus capacitor is used as an active power filter. A new control strategy is proposed which is based on two popular strategies: synchronous d-q reference frame method & synchronous...
This paper presents a novel and easy to implement control strategy for unified power quality conditioner (UPQC). The control strategy of parallel active filter (PAF) is based on Fourier transform theory, while the control circuit of series active filter (SAF) is based on positive sequence detection theory. Operating of PAF using this method compensates for reactive power and current harmonics, while...
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