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System Configuration
VSC-HVDC control and protection system consists of operator monitoring equipment and distributed control and protection equipment. They communicate each other via high speed Ethernet. The control and protection equipment itself, communicate and coordinate through Field Bus, i.e. CAN bus.
Operator Monitoring Equipment
Operator control system is used for the operation and monitoring of the whole VSC-HVDC system. It is composed of workstation, server and remote communication equipment, so as to achieve multiple monitoring of station, remote scheduling and centralized control.
Station operator monitoring: Providing converter station operators with an interface of monitoring and control. It provides complete monitoring, control, fault or abnormal condition handling to whole VSC-HVDC system, as well as parameter adjustment.
Remote control center monitoring: transmitting information of station level, such as parameters, data of station control and protection system, to remote control center through communication channel. Meanwhile, issuing instructions to converter station in necessary situation, and if required, it also can send parameter changing order to station level.
Centralized control center monitoring: national level control and monitoring centre, similar function to remote center, but high priority.
Control and Protection Equipment
Control and protection equipment provides comprehensive control and protection to both AC and DC system.
It includes system-level, station-level and converter-level functions, which are integrated in a single host. This design has advantages of effectively reducing interfaces and decreasing fault rates so as to improve system availability, reduce complexity and enhance reliability. AC equipment like filter bank, converter transformer, are protected by independent relays..
I/O unit is the interface between primary equipment and control system, it takes all necessary inputs, including analog and digital data of primary side to control host, and deliver control and protection orders to primary equipment.
