An Enhanced Power Quality and Smooth Transition Control Strategy for a Microgrid without Remote Pre-Synchronization Communication

被引：0
|
作者：
Guo H. [1 ]
Meng X. [1 ]
He M. [1 ]
Liu X. [1 ]
Liu J. [2 ]
机构：
[1] School of Electrical Engineering, Sichuan University, Chengdu
[2] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2022年 / 37卷 / 10期
关键词：
Grid-connected mode; Power quality; Pre-synchronization; Seamless transition; Stand-alone mode;
D O I：
10.19595/j.cnki.1000-6753.tces.210575
中图分类号：
学科分类号：
摘要：
The paper proposes a smooth transition control strategy for microgrids with high power quality and no need for remote communication lines. The microgrid is mainly composed of multiple parallel distributed power generation units and a pre-synchronization unit. A unified grid-connected current control structure is proposed for the interface inverter in the distributed power generation unit, which has the following advantages: ① Without island detection, the inverter can automatically switch between the current control state of the grid-connected mode and the voltage control state of the stand-alone mode to ensure the load power supply quality; ② The proposed unified grid-connected current control structure can effectively suppress the harmonics in grid-connected current and capacitor voltage; ③ When the grid frequency fluctuates, the inverter can still output the corresponding active and reactive power according to the command value, and can synchronize with the grid without a phase-locked-loop or a frequency-locked-loop in the grid-connected operation state. In addition, the proposed pre-synchronization unit can realize the pre-synchronization control of the microgrid voltage and the grid voltage without relying on the remote communication lines. It also reduces the inrush current when the stand-alone operation state changes to the grid-connected operation state. Finally, the control parameters are optimized, and the effectiveness and feasibility of the proposed control strategy are verified through experiments. © 2022, Electrical Technology Press Co. Ltd. All right reserved.
引用
收藏
页码：2611 / 2621
页数：10
相关论文
共 16 条
  • [1] (2020)
  • [2] (2019)
  • [3] Kumar S, Singh B., Seamless operation and control of single phase hybrid PV-BES-utility synchronized system, IEEE Transactions on Industry Applications, 55, 2, pp. 1072-1082, (2019)
  • [4] Huang Shusyuan, Konishi Y, Yang Zongzhen, Et al., Observer-based capacitor current sensorless control applied to seamless transfer single-phase inverter System, IEEE Transactions on Power Electronics, 34, 3, pp. 2819-2828, (2019)
  • [5] Prabowo Y, Kwon M, Park S, Et al., Improved indirect current control for utility-interactive inverter system with critical load, 2016 3rd Conference on Power Engineering and Renewable Energy (ICPERE), pp. 1-5, (2016)
  • [6] Eskandari M, Li Li, Microgrid operation improvement by adaptive virtual impedance, IET Renewable Power Generation, 13, 2, pp. 296-307, (2018)
  • [7] Alam F, Ashfaq M, Zaidi S S, Et al., Robust droop control design for a hybrid AC/DC microgrid, 2016 UKACC 11th International Conference on Control (CONTROL), pp. 1-6, (2016)
  • [8] Zhao Xiaojun, Dong Jie, Zhang Chunjiang, Et al., Modeling and stability analysis of autonomous microgrid composed of inverters based on improved droop control, 2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia), pp. 1720-1724, (2016)
  • [9] Trinh Q, Lee H., An enhanced grid current compensator for grid-connected distributed generation under nonlinear loads and grid voltage distortions, IEEE Transactions on Industrial Electronics, 61, 12, pp. 6528-6537, (2014)
  • [10] IEEE 1547-2018 IEEE standard for interconnection and interoperability of distributed energy resources with associated electric power systems interfaces, (2018)
12