M.Ing. (Electrical & Electronic Engineering) / The emphasis is currently. on improving the performance and operational costs of compensators rather than finding new topologies. In the light of improving the operational costs of a compensator, a thorough knowledge of the losses in the compensator is required. This thesis analyses the losses in two commonly used compensators : the static VAR compensator (SVC) and the dynamic compensator. The dynamic compensator is then further subdivided into voltage-fed (VFC) and current-fed (CFC) dynamic compensator categories. Two processes are employed in this thesis: the instantaneous measurement of current and voltage to calculate the power losses and the subsequent modelling of these losses. As a first step the necessity for these loss-models are investigated by researching the extent to which these types of compensators are employed in practical power networks for the compensation of power factor and for harmonic elimination. This study then progresses to investigate the validity of the formula used to calculate power losses. Errors are always encountered when measuring signals and performing calculations on these measurements. These errors are studied and mathematically quantified. In the past various errors have been made in developing loss models for compensators. Some of these errors are investigated in this thesis. To enable the correct modelling of the losses in the various individual components of .compensators, the operation of these compensators must be understood. This is done and attention is given to the particular operational environments within which these components operate. The literature is then surveyed to find loss-models which are most appropriate for these conditions. In some instances existing models are adequate, while in others certain refinements are made, and in still others new loss-models are developed. It is out of these new models that the frequency-dependent inductor model is developed. This model can be used in any environment where voltage and current harmonics are present...
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uj/uj:3723 |
| Date | 10 February 2014 |
| Creators | Boake, Ian Gordon |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Johannesburg |
Page generated in 0.0023 seconds