Access Restriction

Author Vijay, P. ♦ Babu, Kumar ♦ Prasad, P. Bhaskara ♦ Lalitha, M. Padma
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Transmission Line ♦ Power Upgrading ♦ Thermal Limit ♦ Ac Dc Transmission ♦ Transient Instability ♦ Original Line ♦ Long Extra High Voltage ♦ Usual Ac ♦ Simultaneous Ac Dc Power Transmission ♦ Flexible Ac Transmission System ♦ Substantial Gain ♦ Dc Current Order ♦ Master Current Controller Sens ♦ Dc Power Transmission ♦ Load Ability ♦ Coordinated Control ♦ Insulator String ♦ Sufficient Margin ♦ Index Term Extra High Voltage ♦ Parallel Ac Dc Transmission ♦ Experimental Study ♦ Double Circuit Ac Line ♦ Added Dc Power Flow ♦ Power System Computer-aided Design ♦ Independent Control ♦ Ac Line
Abstract Long extra high voltage (EHV) ac lines cannot be loaded to their thermal limits in order to keep sufficient margin against transient instability. With the scheme proposed in this project, it is possible to load these lines very close to their thermal limits. The conductors are allowed to carry usual ac along with dc superimposed on it. The added dc power flow does not cause any transient instability. This project gives the feasibility of converting a double circuit ac line into composite ac–dc power transmission line to get the advantages of parallel ac–dc transmission to improve stability and damping out oscillations. Simulation and experimental studies are carried out for the coordinated control as well as independent control of ac and dc power transmissions. No alterations of conductors, insulator strings, and towers of the original line are needed. Substantial gain in the load ability of the line is obtained. Master current controller senses ac current and regulates the dc current orders for converters online such that conductor current never exceeds its thermal limit. Index Terms — Extra high voltage (EHV) transmission, flexible ac transmission system (FACTS), power system computer-aided design (PSCAD) simulation, simultaneous ac–dc power transmission. I.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study