Abstract: Electricity is an essential source of energy for modern life, and High Voltage Direct Current (HVDC) & Flexible AC Transmission Systems (FACTS) represent advanced technologies that are shaping the new age electrical power transmission & distribution. The benefits of HVDC technology over its HVAC counterpart in long-distance and high-capacity power transmission are obvious, as it offers lower transmission losses, increased stability and possibility to interconnect systems operating on different frequencies. HVDC helps to reduce these energy losses by changing AC to DC before sending it long distances, switching it back to AC and only converting the power once, for example when receiving power from remote renewable energy sources. In general, Flexible AC Transmission Systems (FACTS) are utilized to reduce power losses, increase the loading of transmission lines so that it will provide more security and control gives makes the system flexible. The FACTS devices for the AC systems enhance control and damp out power quality issues, to level of optimization in the performance of an existing system such as Static VAR Compensators (SVC), the Unified Power Flow Controllers (UPFC). AC/DC hybrid technologies: These are the key to controlling power flow, maintaining voltage stability and increasing AC network transmission capacity substantially without major new transmission lines. In the absence of it, HVDC and FACTS works together to meet growing needs for reliable, efficient and sustainable energy transmission. They support the integration of renewable energies, provide benefits for grid stabilisation and facilitate security of supply thanks to a networked configuration of resilient controls. This article presents the benefits, application and impact of HVDC & FACTS technology on global power transmission view..
Keywords: Power Transmission, AC Transmission, Flexible AC. HVDC Tech, Power Flow, Advanced Tech, Network
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