Distributed‐hierarchical control strategy to coordinate peer‐to‐peer energy transactions and node voltages at low voltage distribution networks. Issue 6 (13th November 2020)

• Record Type: Journal Article
• Authors: Fazeli, Seyed Mahdi; Li, Ran; Li, Furong
• Is Part Of: IET smart grid. Volume 3:Issue 6(2020)
• Page Start: 843
• Page End: 850
• Publication Date: 2020-11-13
• Subjects: reactive power -- voltage control -- power markets -- power distribution control -- centralised control -- optimal control -- distributed control -- hierarchical systems; nodal voltage references -- current limit strategy -- network capacity -- voltage profiles -- short‐term voltage magnitude variations -- power transaction levels -- node voltage violations -- distributed‐hierarchical control strategy -- peer‐to‐peer energy transactions -- node voltages -- low voltage distribution networks -- Peer‐to‐peer energy market -- unregulated P2P transactions -- system voltages -- distributed‐hierarchical control structure -- central controller -- peer controllers -- optimised P2P transaction levels -- voltage mitigation methodologies -- phase decoupled P‐Q theory -- reactive power contributions -- IEEE 19‐bus system; Smart power grids -- Periodicals; Computer science -- Periodicals; Energy industries -- Periodicals; Broadcasting -- Periodicals; 333.79110285
• DOI: 10.1049/iet-stg.2019.0342
• Languages: English
• ISSNs: 2515-2947

Abstract

Abstract : Peer‐to‐peer (P2P) energy market has emerged as a promising way to absorb local generations. However, unregulated P2P transactions are likely to exacerbate voltage violations at distribution networks. The challenge is how to ensure P2P markets to flourish whilst maintaining system voltages within the stator limits. This study proposes a distributed‐hierarchical control structure consisting of a central controller and peer controllers to address the challenge. The central controller computes the optimised P2P transaction levels and the nodal voltage references simultaneously and sends the outcomes to the peers as routing‐update messages at regular intervals. The peer controllers are developed based on individual phase decupled P – Q theory where two individual channels follow the optimised transaction levels and nodal voltage references. The peers, also, apply a current limit strategy to release the network capacity and improve voltage profiles when confronting with short‐term voltage magnitude variations between the two update intervals. A case‐study‐based investigation shows that reactive power contributions improve the power transaction levels up to 30% while the node voltage violations are reduced. The effectiveness of the proposed strategy is validated using simulation and compared with state‐of‐the‐art voltage mitigation methodologies over the IEEE 19‐bus system.