TY  - EJOU
AU  - Wang, Wei 
AU  - Shao, Qingzhu 
AU  - Wang, Shaoliang 
AU  - Zhao, Yiwei 
AU  - Ye, Yuanbo 
AU  - Li, Duanchao 
AU  - Wu, Mengyu 

TI  - Partitioning Calculation Method of Short-Circuit Current for High Proportion DG Access to Distribution Network
T2  - Energy Engineering

PY  - 2024
VL  - 121
IS  - 9
SN  - 1546-0118

AB  - Aiming at the problem that the traditional short-circuit current calculation method is not applicable to Distributed Generation (DG) accessing the distribution network, the paper proposes a short-circuit current partitioning calculation method considering the degree of voltage drop at the grid-connected point of DG. Firstly, the output characteristics of DG in the process of low voltage ride through are analyzed, and the equivalent output model of DG in the fault state is obtained. Secondly, by studying the network voltage distribution law after fault in distribution networks under different DG penetration rates, the degree of voltage drop at the grid-connected point of DG is used as a partition index to partition the distribution network. Then, iterative computation is performed within each partition, and data are transferred between partitions through split nodes to realize the fast partition calculation of short-circuit current for high proportion DG access to distribution network, which solves the problems of long iteration time and large calculation error of traditional short-circuit current. Finally, a 62-node real distribution network model containing a high proportion of DG access is constructed on MATLAB/Simulink, and the simulation verifies the effectiveness of the short-circuit current partitioning calculation method proposed in the paper, and its calculation speed is improved by 48.35% compared with the global iteration method.
KW  - High proportion DG; short-circuit calculation; low voltage ride through; partition iteration

DO  - 10.32604/ee.2024.051409