The utility model relates to a control and protection system for a flexible direct current power transmission system. The control and protection system is characterized by comprising a programming logic device array, an analog-to-digital conversion module, a number of complex programmable logic devices, a central processor, an input and output module, a communication module and a display screen, wherein input interfaces of the complex programmable logic devices are connected with an output end of the analog-to-digital conversion module through a parallel bus, information interaction between each of the complex programmable logic devices and the programming logic device array is realized through a pair of optical fibers, information interaction between the central processor and the programming logic device array is realized through a data bus, the central processor is connected with the input and output module and the communication module through adoption of a CAN bus, and the communication module is also connected with the display screen. The control and protection system can be widely applied to the field of electric power electronic current transformers.