Fast recovery strategy of flexible DC distribution network based on energy storage built-in converter after fault

被引：0
|
作者：
Wang B. [1 ]
Liu Z. [2 ]
Mei J. [1 ]
Xue Z. [2 ]
Fan G. [1 ]
Ge R. [1 ]
Chen W. [1 ]
Xu W. [2 ]
机构：
[1] School of Electrical Engineering, Southeast University, Nanjing
[2] State Grid Yangzhou Power Supply Company, Yangzhou
来源：
Mei, Jun (mei_jun@seu.edu.cn) | 1600年 / Electric Power Automation Equipment Press卷 / 40期
关键词：
Energy storage built-in converter; Fast recovery after fault; Flexible DC distribution network; Pole-to-pole short circuit fault; Uninterrupted power supply;
D O I：
10.16081/j.epae.202008028
中图分类号：
学科分类号：
摘要：
A fast recovery strategy after fault suitable for flexible DC distribution network is proposed. Firstly, the topology of ESBC(Energy Storage Built-in Converter) is proposed, and the transient characteristics of the capacitor voltage and fault current of sub-module under the pole-to-pole short circuit fault condition before and after ESBC blocking are analyzed. Furthermore, the fast recovery strategy after fault based on energy storage is proposed to improve the recovery sequence, and the staged charging and discharging strategy is proposed to suppress the impulse current. Finally, the proposed coordinated control strategy is combined with the DC distribution network, which realizes that during the closing period of converter, the energy storage provides power for the important load to guarantee the uninterrupted power supply during fault clearance period, and meanwhile adjusts the capacitor voltage of sub-module during blocking period to reach the rated value before unlocking, so as to reduce the voltage fluctuation when the converter is unlocked, and shorten the restart time of converter. The effectiveness of the proposed strategy is verified by the simulation model in PSCAD/EMTDC. © 2020, Electric Power Automation Equipment Press. All right reserved.
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页码：17 / 23and39
页数：2322
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