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| Equivalent model of multi-type distributed generators under faults with fast-iterative calculation method based on improved PSO algorithm |
| Puyu Wang,Jinyuan Song,Fangyu Liang,Fang Shi,Xiangping Kong,Guangen Xie,Xiao-Ping Zhang,Xinxin Gu |
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| Abstract: |
| There are various types of distributed generators (DGs) with diferent grid integration strategies. The transient char‑
acteristics of the fault currents provided by the DGs are diferent to those of conventional synchronous generators. In
this paper, a distribution network with multi-type DGs is investigated, including consideration of DG low-voltage ride
through (LVRT). The fault current characteristics of two typical DGs, i.e. an inverter-interfaced distributed generator
(IIDG) and a doubly-fed induction generator (DFIG), are analyzed, considering the specifc operation modes. Based on
analysis of the fault characteristics, an equivalent model of the multi-type DGs under symmetrical/asymmetrical fault
conditions is established. A fast-iterative fault calculation method for enhancing the calculation efciency while avoid‑
ing local convergence is then proposed using an improved particle swarm optimization (PSO) algorithm. A simula‑
tion system of the distribution network with multi-type DGs is established in PSCAD/EMTDC. The simulation results
validate the high accuracy and calculation efciency of the proposed calculation method of the fault components.
This can assist in the settings of the protection threshold. |
| Key words: Multi-type distributed generators (DGs), Fault current characteristics, Equivalent model, Fast-iterative
calculation method, Improved particle swarm optimization (PSO) |
| DOI：10.1186/s41601-021-00207-w |
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