International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
High Power and Long Range AC Transmission Line Using HVDC Technology Naina Diwan1, Lumesh kumar sahu 2 Power system and control, Kalinga university, Naya Raipur, Chhattisgarh, India ---------------------------------------------------------------------***--------------------------------------------------------------------1,2
Abstract - Parallel ac-dc transmission improves transient
and dynamic stability of the transmission and damps out the oscillations. This paper presents a simultaneous ac-dc power flow scheme through the same transmission line, giving the advantage of improved stability and damped oscillations and also controls the voltage profile by controlling the total reactive power flow. The paper outlays the advantages of high voltage dc transmission and the possibilities of simultaneous ac-dc power transmission. The project is stimulated and studied using the software Matlab.
Key Words: AC, DC, power, transmission, power grid, blackout, voltage profile, stability
INTRODUCTION High Voltage DC transmission is a lucrative technology that incurs fewer losses for long distance transmission of electricity. HVDC also stabilizes the grid and can interconnect with AC networks. More electrical power can be transmitted over long distances through HVDC systems than AC transmission systems, thus money and land is saved by the requirement of fewer transmission lines. Along with this electrical losses over long distances are reduced. Also HVDC transmission is very stable and controllable , and can stabilize and interconnect AC power networks that are otherwise incompatible. The rapid growing market of HVDC has become an important part of many transmission grids because of its ability to connect remote sources of electrical generation to load centre thousands of kilometres away. The HVDC transmission is an integral part of the electrical power systems improving their overall stability and reliability. The core component of HVDC systems is the power converter, which serves as the interface with the AC transmission system. The conversion from AC to direct current (DC), and vice versa, is achieved by controllable electronic switches, called valves.
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Fig 1- 1 HVDC converter station rectifier | 2 HVDC converter station inverter | 3 Alternating current (AC) | 4 Direct current (DC)
BASIC OF AC-DC POWER TRANSMISSION Fig.2 depicts the basic scheme for simultaneous ac-dc power flow through a double circuit ac transmission line. Fig. 3 shows the following network that carries both ac-dc powers simultaneously.
Fig. 2. Basic Scheme for composite AC-DC Transmission
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