What is line commutated converter?

A line commutated converter (LCC) is a type of power electronic device used to convert alternating current (AC) to direct current (DC) or vice versa, primarily utilizing thyristors for control. It relies on the natural zero-crossing points of the AC waveform to turn off the switching devices, which means that its operation is dependent on the AC supply. LCCs are commonly used in high-voltage direct current (HVDC) transmission systems and in applications where power flow control is essential. However, their performance can be influenced by the characteristics of the AC supply, making them less flexible compared to other converter types like voltage-source converters.