In this article, we will teach you What is an HVDC system?, Why are harmonics generated in HVDC systems?, What is an LCC in electricity?
What is an HVDC system?
An HVDC (high voltage direct current) system is a method of transmitting electricity over long distances using direct current (DC) rather than alternating current (AC). HVDC systems are used for efficient energy transmission over long distances, to interconnect different power grids and to stabilize power systems.
They consist of converter stations that convert alternating current to direct current at the transmitting end, then direct current to alternating current at the receiving end.
Why are harmonics generated in HVDC systems?
Harmonics are generated in HVDC systems mainly due to the operation of converter stations, which use semiconductor devices such as thyristors or IGBTs to convert alternating current into direct current.
These devices can introduce nonlinearities into the electrical system, leading to the generation of harmonic frequencies that can cause interference and distortions in electrical signals.
What is an LCC in electricity?
LCC, or Line Commutated Converter, refers to a type of converter used in HVDC systems. LCCs use thyristors and rely on the natural switching of AC voltage to change the direction of current.
They are used in traditional HVDC systems and are known for their ability to handle high power levels, but can be less flexible and have more harmonic issues than more modern converter technologies.
Direct current is transmitted through conductors or cables that carry a unidirectional flow of electrical charge. In HVDC systems, electricity is converted from AC to DC at the transmitting end, transmitted over high-voltage DC lines, and then converted back to AC at the receiving end.
This method allows for efficient long-distance transmission with lower losses compared to AC transmission.
High voltage in direct current (HVDC) systems generally refers to voltages above 1,000 volts. For HVDC transmission lines, voltages can vary from 100 kV (kilovolts) to over 800 kV. High voltage is used to reduce current for a given power level, thereby minimizing resistive losses and improving long-distance transmission efficiency.
We trust this overview of What is an HVDC system? has been clear.