Frequency and voltage control of hybrid AC/DC networks

Conference Object
Change log
Watson, JD 
Lestas, I 

Hybrid AC/DC networks are a key technology for future electrical power systems, due to the increasing number of converter-based loads and distributed energy resources. In this paper, we consider the design of control schemes for hybrid AC/DC networks, focusing especially on the control of the interlinking converters (ILC(s)). We present two control schemes: firstly for decentralized primary control, and secondly, a distributed secondary controller. In the primary case, the stability of the controlled system is proven in a general hybrid AC/DC network which may include asynchronous AC subsystems. Furthermore, it is demonstrated that power-sharing across the AC/DC network is significantly improved compared to previously proposed dual droop control. The proposed scheme for secondary control guarantees the convergence of the AC system frequencies and the average DC voltage of each DC subsystem to their nominal values respectively. An optimal power allocation is also achieved at steady-state. The applicability and effectiveness of the proposed algorithms are verified by simulation on a test hybrid AC/DC network in MATLAB / Simscape Power Systems.

math.OC, math.OC, cs.SY
Journal Title
Proceedings of the IEEE Conference on Decision and Control
Conference Name
2018 IEEE Conference on Decision and Control (CDC)
Journal ISSN
Volume Title
European Research Council (679774)
ERC starting grant 679774