Start‐up and recovery method with LCC–HVDC systems participation during AC/DC system black‐starts

Abstract

With the increase in a number of online high-voltage direct current (HVDC) systems in China, a big question for their use as black-start and restoration of power system outages arises. Line-commutated converters (LCC)-HVDC systems can significantly reduce recovery time. The black-start-up and recovery conditions for LCC-HVDC systems and the connected AC systems are discussed in this study. The appropriate start-up and recovery modes are identified and the results of the control characteristics of LCC-HVDC systems are analysed in detail. The stability requirements of AC systems in terms of LCC-HVDC system effects are evaluated. Furthermore, the restoration using LCC-HVDC systems, including the priority sequence index of the multi-HVDC links and the optimisation model of the mentioned problem, is discussed in detail. Compared to the conventional black-start strategy, the applicability and effectiveness of the proposed method are illustrated using a part of the actual Guangzhou power system as a test system.