DUAL-STAGE CURRENT LIMITING POWER-FLOW CONTROLLER SUITABLE FOR FLEXIBLE DIRECT DISTRIBUTION NETWORKS

Dai Zhihui; Shi Junyang; Shi Chen; Yang Yishi; Jiang Ying; Zhang Yu

doi:10.19912/j.0254-0096.tynxb.2024-2176

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 92-102. DOI: 10.19912/j.0254-0096.tynxb.2024-2176

DUAL-STAGE CURRENT LIMITING POWER-FLOW CONTROLLER SUITABLE FOR FLEXIBLE DIRECT DISTRIBUTION NETWORKS

Dai Zhihui, Shi Junyang, Shi Chen, Yang Yishi, Jiang Ying, Zhang Yu

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Abstract

Aiming at the issue that power flow controllers are vulnerable to damage under short-circuit fault conditions, thereby compromising power supply reliability, this paper proposes a two-stage current-limiting power flow controller tailored for flexible DC distribution networks. The proposed controller is designed to ensure safe operation during transient processes while enabling functional reuse. It integrates both power flow control and two-stage current-limiting capabilities: under steady-state conditions, it allows flexible adjustment of line power flow; during faults, it can rapidly switch operational states and implement adaptive current limiting based on fault types, making it suitable for flexible DC distribution networks with complex topologies. Finally, a six-terminal ring-shaped flexible DC distribution network model is established in PSCAD/EMTDC for simulation analysis. The results verify the effectiveness of the proposed power flow controller under various operating scenarios, including power flow control, multi-line coordinated control, fault current limiting, and transition from power flow control to current limiting mode, while also satisfying practicality and economic requirements.

Key words

DC distribution system / power flow control / short circuit current / fault current limiting / topological structure / control principle

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Dai Zhihui, Shi Junyang, Shi Chen, Yang Yishi, Jiang Ying, Zhang Yu. DUAL-STAGE CURRENT LIMITING POWER-FLOW CONTROLLER SUITABLE FOR FLEXIBLE DIRECT DISTRIBUTION NETWORKS[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 92-102 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2176

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