Converter stations are
located at the terminals of a DC transmission line. Converter stations can change alternating
current into direct current or change direct current to alternating current. Sometimes
converter stations are located at a generation power plant or at transmission substations.
Two unsynchronized AC transmission systems can be connected together with converter stations.
Converter stations are also found in most substations for converting the
emergency battery back-up system to AC power for use in an emergency.
Figure 1. Converter station in battery room