A Study on the Implementation of HVDC for Power System Interconnection

Modern power systems have an ever-increasing power demand; an increase in power supply must answer this increase in demand. One method to increase the reliable supply of power requires the interconnection of multiple power systems. The main problems associated with the interconnection of multiple electrical networks include the need for the synchronization between networks, losses associated with long transmission lines, increase in the short circuit current, and a possible reduction in network stability. The implementation of high voltage direct current (HVDC) transmission systems is a possible solution to such limitations, resulting in a higher capacity, more reliable, and a more efficient power system. A preamble exploring the power flow in the AC transmission systems continues with the description of the operation of the HVDC transmission link. Consequently, the paper proposes an analysis regarding the effects induced by the presence of the HVDC in the interconnected power systems. In the case of the study presented in the paper further on, subjecting an HVDC transmission link, there is a load flow analysis followed by a transient one; both simulations performed utilizing the ETAP software package. Results-driven conclusions about the effects of the HVDC transmission lines on power systems complete the paper.