Electric Power Substations Engineering

Control and Protection System

Today’s state-of-the-art #HVDC and #FACTS controls fully digitized and processor-based allow steady-state, quasi-steady-state, dynamic, and transient control actions and provide important #equipment and system #protection functions. Fault monitoring and sequence-of-event recording devices are used in most #power #electronics stations.

Typically, these #stations are remotely controlled and offer full local controllability as well. Man-machine interfaces are highly computerized, with extensive #supervision and #control via monitor and keyboard. All of these functions exist in addition to the basic #substation secondary systems.

HVDC control and protection #algorithms are usually rather complex. Real power, #reactive power, #AC bus frequency and voltage, startup and shutdown sequences, contingency and fault recovery sequences, remedial action schemes, #modulation schemes for system oscillation and #SSR damping, and loss of #communication are some of the significant control #parameters and conditions.

Special voltage vs. #current control #characteristics are used for converters in multiterminal HVDC systems to allow safe #operation even under loss of interstation communication.

Furthermore, HVDC controls provide equipment and system protection, including thyristor overcurrent, thyristor overheating, and #DC #line #fault protection. Control and protection reliability are enhanced through redundant and fault-tolerant design. HVDC stations can often be operated from different control centres

#powersubstation #control #protection