Modeling, Stability Analysis and Control of Grid-connected Inverter System Using Power Electronics Transformer

被引：0
|
作者：
Tang J. [1 ]
Zou Z. [1 ]
Liu X. [1 ]
Wang Z. [1 ]
Cheng M. [1 ]
机构：
[1] School of Electrical Engineering, Southeast University, Nanjing
来源：
Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Impedance model; Power electronics transformer (PET); Stability analysis; Stability control strategy;
D O I：
10.13335/j.1000-3673.pst.2021.1802
中图分类号：
学科分类号：
摘要：
Power electronic converter is an important interface for the connection of distributed generation to the power system. However, the grid-connected converters tend to be unstable under weak grid conditions. In order to improve the stability of the system, this paper uses the power electronics transformer (PET) to connect the distributed energy resources and the grid. The PET realizes the functions of voltage transformer and isolation, and adjusts the output voltage. In addition, the PET adjusts the output impedance of the secondary side converter by modifying the control parameters or the control strategy in order to improve the system stability. Aiming at the grid-connected distributed generation system based on the PET, the complex frequency domain impedance model of the system is firstly established in this paper. The stability of the system is evaluated by using the generalized Nyquist criterion, and the influence of various control parameters on the stability is studied. Then, the two stability control strategies, the virtual impedance and the digital filter, are used to improve the system stability. Finally, the accuracy of the modeling and the stability analysis and the effectiveness of the stability control strategy are verified by simulation and experiment. © 2021, Power System Technology Press. All right reserved.
引用
收藏
页码：4224 / 4232
页数：8
相关论文
共 26 条
  • [1] CHEN Xin, WANG Yuncheng, GONG Chunying, Et al., Overview of stability research for grid-connected inverters based on impedance analysis method, Proceedings of the CSEE, 38, 7, pp. 2082-2094, (2018)
  • [2] CESPEDES M, SUN Jian, Impedance modeling and analysis of grid-connected voltage-source converters, IEEE Transactions on Power Electronics, 29, 3, pp. 1254-1261, (2014)
  • [3] JIANG Yuxia, TIAN Yanjun, LI Yonggang, Analysis of the influence of active power load fluctuation on the stability of distributed generation grid-connected inverter and improved control strategy, Power System Technology, 44, 2, pp. 646-654, (2020)
  • [4] WANG Zhong, YAO Zhilei, WANG Qin, Et al., Single-phase double-grounded transformer-less PV grid-connected inverter with wide input voltage range, Proceedings of the CSEE, 40, 3, pp. 911-919, (2020)
  • [5] WU Xiangqiang, WANG Yuncheng, CHEN Xin, Et al., Sequence impedance model and interaction stability research of three-phase grid-connected inverters with considering coupling effects, Proceedings of the CSEE, 40, 5, pp. 1605-1616, (2020)
  • [6] WEI Shilei, TIAN Yanjun, WANG Yi, Et al., Virtual inductance control for enhancing stability of LCL inverter in weak grid, High Voltage Engineering, 45, 6, pp. 1827-1834, (2019)
  • [7] WANG Guizhong, WU Fengjiang, LI Hongbo, Et al., Current-prediction-control-based diode-clamped grid-connected inverter with flexible topology, High Voltage Engineering, 46, 1, pp. 144-150, (2020)
  • [8] CHEN Bo, ZENG Chengbi, MIAO Hong, Et al., Improved voltage feedforward method for improving robust stability of grid-connected inverters in weak grids, Journal of Electric Power Science and Technology, 36, 3, pp. 118-124, (2021)
  • [9] XIONG Liansong, LIU Xiaokang, LIU Yonghui, Et al., Modeling and stability issues of voltage-source converter dominated power systems: a review, CSEE Journal of Power and Energy Systems, pp. 1-18, (2020)
  • [10] WANG Xiongfei, HARNEFORS L, BLAABJERG F., Unified impedance model of grid-connected voltage-source converters, IEEE Transactions on Power Electronics, 33, 2, pp. 1775-1787, (2018)
123