Simplified Electromagnetic Transient Equivalent Model of Multi-active-bridge-based Power Electronic Transformer

被引：0
|
作者：
Zheng C. [1 ]
Xu W. [1 ]
Wang X. [1 ]
Gao C. [1 ]
Xu J. [1 ]
Zhao C. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2022年 / 46卷 / 19期
关键词：
cascaded H-bridge (CHB); DC distribution network; generalized state average method; input-series output-parallel (ISOP); multi-active-bridge (MAB); power electronic transformer (PET); simplified electromagnetic transient simulation;
D O I：
10.7500/AEPS20211201008
中图分类号：
学科分类号：
摘要：
The power electronic transformer (PET) is one of the key devices in the flexible DC distribution system. Due to the small simulation step size caused by high-frequency characteristics of PET, the detailed electromagnetic transient (EMT) simulation of PET is extremely time-consuming, especially for the multi-active-bridge (MAB) based PET. Hence the simulation speed needs to be accelerated. This paper proposes a simplified EMT equivalent model of the cascaded H-bridge (CHB) type MAB-based PET. The structural characteristics of MAB are analyzed. For the CHB slow-change circuit, the switching function model is adopted to divide the circuit states. Based on the generalized state-space average method,for the fast-changing circuit of MAB, the equivalent that the Fourier decomposition method is used and the harmonic characteristics of key orders are kept is achieved. The processing methods of port electrical variables in different cascading modes are proposed to improve the simulation acceleration ratio while preserving accuracy. The detailed model and the simplified equivalent model of input-series output-parallel type MAB-based PET are built in PSCAD/EMTDC. The simulation results show that the simplified EMT equivalent model has similar accuracy and higher efficiency compared with the detailed model. © 2022 Automation of Electric Power Systems Press. All rights reserved.
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页码：113 / 122
页数：9
相关论文
共 26 条
  • [1] AN Feng, SONG Wensheng, YANG Kexin, Et al., Virtual power balance control scheme of dual active bridge DC-DC converters with output-parallel structure ［J］, Automation of Electric Power Systems, 42, 12, pp. 106-112, (2018)
  • [2] LI Zixin, GAO Fanqiang, ZHAO Cong, Et al., Research review of power electronic transformer technologies［J］, Proceedings of the CSEE, 38, 5, pp. 1274-1289, (2018)
  • [3] LI Junjie, LU Zhenyu, WU Zaijun, Et al., Adaptive switching strategy of AC/DC hybrid microgrid operating mode based on power electronic transformer［J］, Electric Power Automation Equipment, 40, 10, pp. 126-131, (2020)
  • [4] TANG Jian, ZOU Zhixiang, LIU Xingqi, Et al., Modeling，stability analysis and control of grid-connected inverter system using power electronics transformer ［J］, Power System Technology, 45, 11, pp. 4224-4233, (2021)
  • [5] LI Kai, ZHAO Zhengming, YUAN Liqiang, Et al., Overview on research of multi-port power electronic transformer oriented for AC/DC hybrid distribution grid［J］, High Voltage Engineering, 47, 4, pp. 1233-1250, (2021)
  • [6] XU Jianzhong, LI Chengyu, XIONG Yan, Et al., A review of efficient modeling methods for modular multilevel converters［J］, Proceedings of the CSEE, 35, 13, pp. 3381-3392, (2015)
  • [7] XU Jianzhong, GAO Chenxiang, DING Jiangping, Et al., Electromagnetic transient acceleration simulation methods and prospects of high-frequency isolated power electronic transformer ［J］, Proceedings of the CSEE, 41, 10, pp. 3466-3479, (2021)
  • [8] YI Shuxian, YUAN Liqiang, LI Kai, Et al., High-efficiency modeling method for regional energy routers［J］, Journal of Tsinghua University（Science and Technology, 59, 10, pp. 796-806, (2019)
  • [9] AN Feng, Bin CUI, BAI Ruihang, Et al., Modular discrete decoupling equivalent modeling method for high-voltage large-capacity DC transformer［J］, Automation of Electric Power Systems, 45, 7, pp. 79-86, (2021)
  • [10] An accelerated model of modular isolated DC/DC converter used in offshore DC wind farm［J］, IEEE Transactions on Power Electronics, 34, 4, pp. 3150-3163, (2019)
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