Performance Evaluation and Reliability of Flexible Asynchronous AC Link and LCC-HVDC Link under Fault Conditions

Abstract

Normally, HVDC links are used for the asynchronous interconnection of power system networks. Similarly, asynchronous AC links are also used for the same application. Here, the performance of a proposed flexible asynchronous AC link (FASAL) and a back-to-back line-commutated converter-based high-voltage direct current (BTB LCC-HVDC) link is evaluated and compared. These links are used for grid interconnection and to control the power transfer between interconnected grids. PSCAD/EMTDC based simulation model is developed for both the links. Modified CIGRE benchmark system is used for the simulation of the BTB LCC-HVDC link. The steady-state and dynamic simulations are carried out for the systems under consideration. The simulation results show that both the links are able to control power flow between the interconnected grids. It is evident from the results that the effect of fault is severe in the LCC-HVDC link as compared to FASAL system. Also, the impact of the fault on the healthy side grid is minimal in the FASAL as compared to the HVDC link.