TY - GEN
T1 - An Optimal Sequence Small-AC-Signal Injection Based Reactive Power Sharing Method for Parallel Grid-Forming Inverters in Islanded Microgrids with Harmonic Loads
AU - Shang, Jiayu
AU - Liu, Zeng
AU - Wu, Xiaochen
AU - Shi, Yidong
AU - Wang, Wenchen
AU - Liu, Jinjun
AU - Wang, Qingbin
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2024
Y1 - 2024
N2 - The small-AC-signal (SACS) injection based method is attractive for solving the reactive power sharing issue among parallel grid-forming inverters in islanded microgrids. However, if the SACS frequency is closed to the one of the harmonic load currents, the SACS current extraction will be disturbed, and then causes the system oscillation. In this paper, the harmonic currents of three-phase bridge rectifiers and nonlinear inductive loads are analyzed. Based on the sequence of harmonic currents, the SACS whose sequence is opposite to the harmonic currents is injected into the output voltage of each parallel inverter to mitigate the influence of harmonic currents, while the frequency of SACS droops with reactive power. Therefore, the reactive power will be accurately sharing and the effect of harmonic loads can be mitigated. The effectiveness of the proposed method is verified by the simulation and experimental results.
AB - The small-AC-signal (SACS) injection based method is attractive for solving the reactive power sharing issue among parallel grid-forming inverters in islanded microgrids. However, if the SACS frequency is closed to the one of the harmonic load currents, the SACS current extraction will be disturbed, and then causes the system oscillation. In this paper, the harmonic currents of three-phase bridge rectifiers and nonlinear inductive loads are analyzed. Based on the sequence of harmonic currents, the SACS whose sequence is opposite to the harmonic currents is injected into the output voltage of each parallel inverter to mitigate the influence of harmonic currents, while the frequency of SACS droops with reactive power. Therefore, the reactive power will be accurately sharing and the effect of harmonic loads can be mitigated. The effectiveness of the proposed method is verified by the simulation and experimental results.
KW - Power sharing
KW - harmonic loads
KW - phase sequence
KW - small-AC-signal injection
UR - https://www.scopus.com/pages/publications/85199103483
U2 - 10.1109/IPEMC-ECCEAsia60879.2024.10567751
DO - 10.1109/IPEMC-ECCEAsia60879.2024.10567751
M3 - 会议稿件
AN - SCOPUS:85199103483
T3 - 2024 IEEE 10th International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia
SP - 5064
EP - 5069
BT - 2024 IEEE 10th International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia
Y2 - 17 May 2024 through 20 May 2024
ER -