A high-voltage, direct current (HVDC) electric power transmission system (also called a power superhighway or an electrical superhighway) uses direct current for the bulk transmission of electrical power, in contrast with the more common alternating current (AC) systems. For long-distance transmission, HVDC systems may be less expensive and have lower electrical losses. For underwater power cables, HVDC avoids the heavy currents required to charge and discharge the cable capacitance each cycle. For shorter distances, the higher cost of DC conversion equipment compared to an AC system may still be justified, due to other benefits of direct current links.
Most HVDC links use voltages between 100 kV and 800 kV. A 1,100 kV link in China was completed in 2019 over a distance of 3,300 km with a power of 12 GW.  With this dimension, intercontinental connections become possible which could help to deal with the fluctuations of wind power and photovoltaics.
HVDC allows power transmission between unsynchronized AC transmission systems. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows transfer of power between grid systems running at different frequencies, such as 50 Hz and 60 Hz. This improves the stability and economy of each grid, by allowing exchange of power between incompatible networks.
HVDC Transmission Modeling using PLL + Hysteresis Current Control
1. Complete Simulink File (.slx & .mdl)
2. Satisfactory Results
3. Universal Design (Accept All inputs)
4. Can Take Case Studies
5. Operates on All MATLAB Version
6. Easy to Understand all blocks
7. Can take waveforms & readings
8. Instruction Manual
9. Technical Helpline Number
10. Digital Files (Access Anywhere)