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122 / 2024-07-31 20:50:07
Voltage Imbalance Compensation for Unbalanced Local Load Under Weak Grid Though Three-Phase Four-Leg Inverter
battery management,three-phase four-leg voltage source inverter,unbalanced grid compensation,weak grid,power condition system
2.Power Electronics Technology and Application > 3.Control, modeling and transient stability analysis of grid-connected converter
Final Paper
Ruirui Han / Huazhong University of Science and Technology；School of Electrical and Electronic Engineering
Jie Hong / Wuhan Huahai General Electric Co., Ltd
Lin Shi / Wuhan Second Ship Design and Research Institute
zhuolan li / Huazhong University of Science and Technology
Haixiang Gao / School of Electrical and Electronic Engineering, Huazhong University of Science and Technology
Yu Zhang / Huazhong University of Science and Technology
Under weak grid, three-phase unbalanced local load will lead to serious voltage imbalance at the point of common coupling (PCC). This will result in the fault or damage of local load. Three-phase four-leg inverter can provide a zero-sequence current path for unbalanced load, thus can compensate for load imbalance. In this paper, three-phase four-leg inverter is used in the power condition system working under weak grid, which is controlled to balance the PCC voltage caused by unbalanced local loads and simultaneously to lower the battery discharge. Firstly, through the separate control of the positive and negative sequence components of PCC voltage, balanced PCC voltage is achieved under unbalanced load. Furthermore, zero sequence current is controlled to not flow through the grid neutral line. Secondly, a droop control method is proposed to eliminate positive sequence active power outputting from the inverter, which can lower the discharge of the battery. Finally, simulation results verified the correctness and effectiveness of the proposed control strategy.
Important Date

  • Conference Date

    Nov 06

    2024

    to

    Nov 08

    2024

  • Sep 15 2024

    Draft paper submission deadline

  • Nov 08 2024

    Registration deadline

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Huazhong University of Science and Technology
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