Reactive Power Sharing Strategy for Multiple Parallel Grid-forming Converters Based on Adaptive Virtual Impedance

被引：0

作者：

Liu, Qinyi ^{[1
]}

Huang, Weihuang ^{[2
]}

Guo, Zhu ^{[2
]}

Zhu, Hongxi ^{[1
]}

Liu, Fei ^{[1
]}

机构：

[1] Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy, School of Electrical Engineering and Automation, Wuhan University, Wuhan

[2] State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid Company Limited, Guangzhou

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2024年 / 48卷 / 15期

关键词：

circulating current suppression; grid-forming control; microgrid; parallel converters; power sharing; virtual impedance;

D O I：

10.7500/AEPS20231005002

中图分类号：

学科分类号：

摘要：

Due to the mismatch of the line impedance of each converter, it is difficult to realize the accurate reactive power sharing for multiple parallel grid-forming converters under the traditional droop control strategy. In order to improve the reactive power sharing accuracy, this paper analyzes the power sharing mechanism of the parallel converters and proposes an adaptive virtual impedance design method that combines the reactive power sharing error and the output voltage of the converter. Under the operation condition where the actual line impedance is unknown and there is no interconnection communication between distributed units, the reactive power sharing strategy based on the proposed method can achieve high reactive power sharing accuracy. It also improves the contradiction between the reactive power sharing accuracy and the output voltage drop that exists when the virtual impedance is introduced. And the circulating current between converters is suppressed. In addition, the small-signal stability analysis of the converter is performed to rationally design the control parameters. The hardware-in-loop simulation results verify the effectiveness of the proposed control strategy. © 2024 Automation of Electric Power Systems Press. All rights reserved.

引用

页码：122 / 130

页数：8

共 26 条

[1]

SHENG Wanxing, WU Ming, JI Yu, Et al., Key techniques and engineering practice of distributed renewable generation clusters integration［J］, Proceedings of the CSEE, 39, 8, pp. 2175-2186, (2019)

[2]

LIU Yingshu, CHEN Xi, LI Bin, Et al., State of art of the key technologies of multiple microgrids system［J］, Power System Technology, 44, 10, pp. 3804-3820, (2020)

[3]

ZHENG Zhong, MIAO Shihong, LI Chao, Et al., Coordinated optimal dispatching strategy of AC/DC distribution network for the integration of micro energy Internet ［J］, Transactions of China Electrotechnical Society, 37, 1, pp. 192-207, (2022)

[4]

ZHANG Shixu, LI Yaowang, LIU Weisheng, Et al., Economic，low-carbon and reliable multi-objective optimal configuration method of cloud energy storage for microgrid clusters ［J］, Automation of Electric Power Systems, 48, 1, pp. 21-30, (2024)

[5]

HAN Y, LI H, SHEN P, Et al., Review of active and reactive power sharing strategies in hierarchical controlled microgrids［J］, IEEE Transactions on Power Electronics, 32, 3, pp. 2427-2451, (2017)

[6]

PAWAR B，, BATZELIS E, CHAKRABARTI S, Et al., Grid-forming control for solar PV systems with power reserves［J］, IEEE Transactions on Sustainable Energy, 12, 4, pp. 1947-1959, (2021)

[7]

CHEN Jie, LIU Ming'ao, CHEN Xin, Et al., Wireless parallel and circulation current reduction of droop-controlled inverters［J］, Transactions of China Electrotechnical Society, 33, 7, pp. 1450-1460, (2018)

[8]

LIU Ziwen, MIAO Shihong, FAN Zhihua, Et al., Accurate power allocation and zero steady-state error voltage control of the islanding DC microgird based on adaptive droop characteristics ［J］, Transactions of China Electrotechnical Society, 34, 4, pp. 795-806, (2019)

[9]

XU Yuanyang, WANG Mingyu, Research on new control strategy in low-voltage microgrid［J］, Acta Energiae Solaris Sinica, 41, 9, pp. 70-77, (2020)

[10]

BAI Xiaodan, MIAO Hong, ZENG Chengbi, Et al., Improved droop control strategy for reactive power sharing of inverters in low-voltage microgrids［J］, High Voltage Engineering, 46, 4, pp. 1310-1318, (2020)

← 1 2 3 →