| Fast and repetitive voltage fluctuations can exist on an electric utility's distribution system. These voltage fluctuations, which are usually caused by intermittent loads such as motor starting and welding, can be objectionable and can pose problems to the utility. Conventional equipments such as step voltage regulators or breaker-switched capacitors are not effective in controlling fast and repetitive voltage fluctuations. Static var compensators provide an excellent solution to control voltage fluctuation problems.;Two types of single phase static compensators, Thyristor Switched Capacitor (TSC) and Voltage Source Inverter (VSI), were studied by Jacobson in his thesis, in which the TSC was studied in more detail. As a continuation of this project, this thesis focuses exclusively on the VSI.;In order to study the VSI, a single-phase distribution system was modelled. A VSI model was designed to provide voltage regulation. Digital simulation of a designed VSI model was conducted with an electromagnetic transient program (EMTDC) to test the suitability of the VSI as a voltage regulator when the system was subjected to various load conditions. It was shown, through digital simulation, the the VSI with PWM operation can regulate the voltage and control the harmonics. Further verification was provided via a real time power system simulator. The results showed that the VSI did provide a voltage regulation to the practical system. |
