Static synchronous parallel compensation of var flow in power distribution systems

Excessive var flow can cause extra energy loss and/or significant voltage drop, and is a matter of concern for power system operators and engineers. Var flow control in transmission and distribution systems can be of immense benefit to electric power utilities in regard to performance. Static power electronic controllers are now making a major impact on var compensation in power systems through applications in transmission, distribution and small generation.; Discussed in this dissertation is use of a solid-state device, Insulated Gate Bipolar Transistor - IGBT, to build a current regulated inverter. This inverter is used in developing, what is referred here as a Static State Parallel Compensator, SSPC, for use in power distribution systems and other applications.; There are four important features of this dissertation: (a) A Static Synchronous Parallel compensator that employs a current regulated inverter to inject a current orthogonal to the associated phase voltage is presented. This results in reducing the current from the source power supply. (b) The current regulated inverter is built using a high switching frequency power device: IGBT. (c) The SSPC eliminates the large capacitors and inductors that are necessary for traditional static compensators. (d) Hysteresis-type control is used to regulate the inverter output, which eliminates the need for a large filter inductor. Therefore, the size and cost of the SSPC are smaller than that of a realization employing GTO devices operating at a lower switching frequency.; The SSPC has been simulated and the results are presented in this dissertation. It can be concluded from the results that the magnitude and phase angle of a compensation current can be dynamically adjusted according to load change and technical requirements. The total harmonic distortion of the compensation current is less than 5%, thus meeting industrial requirements.