Simulator Study of Multiterminal HVDC Transmission System without Fast Communication

AC/DC simulator studies for a 4-terminal HVDC system have been carried out to demonstrate the operating performance of the multiterminal HVDC control scheme, "the 2-ACR method", which does not require fast communication systems. A microcomputer is used for converter control. Satisfactory operations have been confirmed through various types of simulations. Examples of an effective and economical DC circuit breaker application, for an AC system fault at the inverter and a DC line fault, are described.