SIMLATION OF POWER QUALITY IMPROVEMENTINTRANSMISSION SYSTEMSUSING IPFC

The series converter of the IPFC employs the D-FACTS concept, which uses multiple small single-phase converters instead of one large-size converter. It is proved that the shunt and series converters in the IPFC can exchange active power at the third-harmonic frequency, and the series converters are able to inject controllable active and reactive power at the fundamental frequency. The IPFC is also used to improving power quality problems such as sag and swell. The reliability of the IPFC is greatly increased because of the redundancy of the series converters. The total cost of the IPFC is also much lower than the DPFC, because no high-voltage isolation is required at the series converter part and the rating of the components of is low.Various operational conditions such as the effect of the transmission angle variation over both primary and secondary systems as well as upon the response of the converters were also addressed. The IPFC, in its simplest form (i.e. with only two series converters), can be very useful in relieving congested systems. Issues like the IPFC instantaneous response and its dynamic behavior, along with their respective simulations, are currently underway.

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