By S A Soman; S A Khaparde; Shubha Pandit
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Extra info for Computational methods for large sparse power systems analysis : an object oriented approach
L. Lewis and W. C. Scott, Distributed Power Generation: Planning and Evaluation, Marcel Dekker, New York, 2000. A. M. Borbely and 1. F. , Distributed Generation. The Power Paradigm for the New Mil/enium, CRC Press, Boca Raton, 200 I . Chapter 2 Characterization of Electric Power Quality The term electric power quality broadly refers to maintaining a near sinusoidal power distribution bus voltage at rated magnitude and frequency. In addition, the energy supplied to a customer must be uninterrupted from the reliability point of view.
A thyristor controlled phase angle regulator (TCPAR) injects voltage in series with a transmission line. As opposed to an SSSC which injects voltage in quadrature with the line current, the TCPAR injects voltage in quadrature with the line voltage . Therefore by adjusting the magnitude of the injected voltage, the phase angle between the sending end and receiving end voltages can be adjusted. Like a TCBR, the TCPAR also does not increase the transmittable power through a transmission line. However it increases the stability limits of the power transfer allowing the system to operate at a higher power angle provided the thermal limit is not reached.
This is usually done in special rectifier transformers but hardly ever in distribution transformers. Power electronic loads like UPS, adjustable speed drives etc usually cause harmonics in power system. A measure of harmonic content in a signal is the total harmonic distortion (THD). 1 ) where Vn denotes the magnitude of the nth harmonic voltage and VI is the magnitude of the fundamental voltage. A similar expression can also be written for current harmonics. 10 (a). It contains a 50 Hz fundamental, plus 3 rd , 5t\ 7th , 9th and 11 th harmonics with their magnitudes being reciprocals of their harmonic numbers.