Final answer:
Converter stations of rotating frequency converters are facilities that change the frequency of AC electricity using motor-generator sets, applicable in industries requiring conversion between different frequency power systems such as railways or power grid connections.
Step-by-step explanation:
The converter stations of rotating frequency converters (RFC) are specialized facilities used in electrical engineering to change the frequency of alternating current (AC) electricity. An RFC utilizes rotary machines, such as a motor-generator set, where one machine is driven at one frequency and the second machine generates power at another frequency. This is particularly useful in applications where there is a need to convert power between two incompatible frequency systems, such as between different power transmission grids or in interfacing with certain types of machinery.
These stations can be found in various industries such as railway electrification, where trains might run across borders with different electrical standards, or in connecting power grids that operate at different frequencies. A converter station typically consists of transformers to adjust voltage levels, the motor-generator set for the frequency conversion, and sometimes additional equipment for synchronization and control of the power flow.