The Unified Power Flow Controller (UPFC) is an advanced Flexible AC Transmission System (FACTS) device that can be controlled to condition alternating voltage and alternating current simultaneously. In this project the use of a reverse connected UPFC topology has been investigated for the improvement of poor power quality at distribution voltage and power levels, namely voltage distortion due to voltage sags and current distortion due to non-linear loads. A three-phase, reverse connected UPFC model, based on two back-to-back connected two-level Voltage Sourced Converters (VSCs) has been modelled in software and tested. To validate the voltage conditioning part of the UPFC, and therefore one half of the software model, a hardware model using one three-phase two-level VSC was constructed and used to condition the load voltage. with a supply voltage distortion due to voltage sags. . With both the software and hardware models voltage sag magnitudes between 0% and 100% are considered. along with phase angle jumps between 00 and 400^ to determine the level of compensation power required from the DC voltage source energy storage. The emphasis on the control was to operate the system as fast as possible and therefore provide a degree of compensation to the fastest of unpredictable power quality disturbances. A preferred control technique was identified for each element of the RC-UPFC.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:682782 |
| Date | January 1999 |
| Creators | Smale, Marcus James |
| Contributors | Jenkins, N. |
| Publisher | University of Manchester |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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