TY  - EJOU
AU  - Xu, Yutao 
AU  - Tan, Zukui 
AU  - Gu, Xiaofeng 
AU  - Wu, Zhuang 
AU  - Li, Jikai 
AU  - Feng, Qihui 

TI  - Impedance Reshaping Based Stability Analysis and Stabilization Control for Flexibly Interconnected Distribution Networks
T2  - Energy Engineering

PY  - 2026
VL  - 123
IS  - 4
SN  - 1546-0118

AB  - Flexibly interconnected distribution networks (FIDN) offer improved operational efficiency and operational control flexibility of power distribution systems through DC interconnection links, and have gradually become the main form of distribution networks. Aiming at the impact of constant power loads and converter transmission power variations in FIDN system stability, this paper presents an impedance reshaping based stability analysis and stabilization control to enhance the stability of the interconnected system and improve the system’s dynamic load response capability. Firstly, a small-single based equivalent impedance model of FIDN system, which consists flexibly interconnected equipment, energy storage, PV units, and constant power loads, is presented, and the total output and input impedance of the DC distribution network are derived. Secondly, the impacts of constant power loads and transmission power variations on the small-signal stability of FIDN system are analyzed through Nyquist stability curves using the impedance ratio criterion. Then, an impedance reshaping-based stability enhancement strategy for the FIDN system is proposed, which can significantly improve the system stability under the operating conditions of constant power loads and transmission power variations. Finally, a MATLAB/Simulink simulation model is built and tested. The results demonstrate that the proposed impedance reshaping strategy effectively mitigates voltage dips, surges, and DC bus fluctuations, shortens transient responses under power variations, and enables rapid stability recovery with reduced voltage drop during severe AC sags.
KW  - Stability analysis; low-voltage AC/DC distribution areas; stabilization control

DO  - 10.32604/ee.2025.071243