Facts & Hvdc

Topics: Electric power transmission, Electric power, Flexible AC transmission system Pages: 12 (3639 words) Published: December 2, 2011
A Paper presented on

E-mail:- nitin.mohurle2000@gmail.com
Nitin Mohurle Shram Sadhana Trust’s College of Engineering And Technology, Jalgaon

Abstract — Development of electrical power supplies began more than one hundred years ago. At the beginning, there were only small DC networks within narrow local boundaries, which were able to cover the direct needs of industrial plants by means of hydro energy. With an increasing demand on energy and the construction of large generation units, typically built at remote locations from the load centres, the technology changed from DC to AC. Power to be transmitted, voltage levels and transmission distances increased. FACTS (Flexible AC Transmission System) and HVDC (High Voltage Direct Current) are controllable devices whose functions are to enhance the security, capacity and flexibility of power transmission systems. Application of these components in power systems implies an improvement of transient and voltage stability, power oscillation damping and optimal power flow. DC transmission and FACTS (Flexible AC Transmission Systems) has developed to a viable technique with high power ratings since the 60s. From the first small DC and AC "mini networks", there are now systems transmitting 3 - 4 GW over large distances with only one bipolar DC transmission: 1.000 - 2.000 km or more are feasible with overhead lines. With submarine cables, transmission levels of up to 600 – 800 MW over distances of nearly 300 km have already been attained, and cable transmission lengths of up to 1.300 km are in the planning stage. As a multiterminal system, HVDC can also be connected at several points with the surrounding three-phase network. FACTS is applicable in parallel connection or in series or in a combination of both. The rating of shunt connected FACTS controllers is up to 800 Mvar, series FACTS devices are implemented on 550 and 735 kV level to increase the line transmission capacity up to several GW. The fast development of power electronics based on new and powerful semiconductor devices has led to innovative technologies, such as high voltage dc transmission (HVDC) and flexible ac transmission system (FACTS), which can be applied in transmission and distribution systems. This paper has discussed the application of high voltage power electronics FACTS and HVDC controllers, needs of advance FACTS and HVDC based control for future power system and enhancing system stability and its development. HVDC and FACTS offer major advantages in meeting these requirements. Keywords—SVC Static Var Compensator

SC Series Capacitor, VSC, STATCOM
The development of Electric Power Industry follows closely the increase of the demand on electrical energy. Main driving factors for energy consumption are listed in Fig. 1. In the early years of power system developments this increase was extremely fast, also in industrialized countries, many decades with the doubling of energy consumption each 10 years. Such fast increase is nowadays still present in the emerging countries, especially in Far-East. In the industrialized countries the increase is, however, only about 1 to 2 % per year with an estimated doubling of the demand in 30 to 50 years. In next 20 years, power consumption in developing and emerging countries is expected to more than double, whereas in industrialized countries, it will increase only for about 40 %. Fast development and further extension of power systems can therefore be expected mainly in the areas of developing and emerging...
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