A Novel Method to Increase the Power Capacity of Transmission Lines Using Transformerless Static Synchronous Series Compensator

International Journal of Smart Electrical Engineering

مقاله 2، دوره 06، شماره 03، آذر 2017، صفحه 87-92   

نوع مقاله: Research Paper

نویسندگان

Mohammad Ghorbani^* ؛ Ali Zarein؛ Ali Mosallanejad

Department of Electrical Engineering, Shahid Beheshti University, Tehran, Iran

چکیده

In this paper a transformerless Static Synchronous Series Compensator (SSSC) to increase the power capacity of a 230 kV transmission line is proposed. In order to eliminate the transformer, a 15-level cascade H Bridge (CHB) inverter is employed within the proposed compensator structure to inject reactive power to the transmission line. The theory of instantaneous p-q power using in the compensator is in such a way that allows for the system to be controlled in one phase. However, this method is used with three-phase systems. The proposed control method is also able to balance the voltage of dc-link capacitors at a desirable level. Modulation technique used by the inverter is Phase-Shifted PWM. In order to validate the proposed compensator’s application, a three-phase transmission line is tested by MATLAB software. The transmitted active power of this transmission line is equal to 160 MW. The results obtained from a dynamic simulation are presented. Simulation results indicated 39% increase in the transmitted active power of the line.

کلیدواژه‌ها

cascade H bridge multilevel inverter؛ Flexible ac transmission system (FACTS)؛ Instantaneous pq theory؛ static synchronous series compensator (SSSC)؛ Transformerless