Novel dynamic modelling of parallel HVAC/HVDC system

H. R. Najafi , F. Robinson , A. Shoulaie

Abstarct

A novel approach is presented for eficiently modeling a power system which includes parallel-connected HVAC , and HVDC transmission systems. The proposed model has been drived for a system in which an AC generator is conected to an infinite bus system through a parallel AC tie line and a HVDC link. In addition to state-space representation, a block diagram representation has been formed to analyze system stability. In this new block diagram representation, the dynamic characteristics of the system are expressed in terms of a newly developed H constant. The development of the block diagram and associated H constants are explained. The new model is evaluted using PSCAD/RTDS real time digital simulation.