Optimization Control Strategy for Power Quality in AC-DC Hybrid Microgrid Based on Master-Slave ILC

doi:10.3969/j.issn.1008-0198.2025.02.010

Abstract

Abstract: Aiming at the power quality problem caused by a large number of nonlinear loads in AC-DC hybrid microgrid, an optimal control strategy for power quality based on master-slave interlinking converter (ILC) is proposed, which adopts a master-slave control mode for multiple ILCs. Among them the ILC with a larger capacity is selected to be the master ILC and works in voltage control mode (VCM), which can make full use of the remaining capacity of the master ILC and absorb a large amount of harmonic components from the AC bus, thus improving the power quality of the microgrid. The slave ILC, operating in current control mode (CCM), can be equated to a smaller virtual conductor in the harmonic domain, which can assist the master ILC to manage negative sequence and harmonics more effectively while suppressing the harmonic resonance that may be generated within the microgrid. At the same time, it can also maintain the stability of the DC bus voltage and more effectively improve the power quality of the AC-DC hybrid microgrid. Finally, the correctness and feasibility of the proposed strategy are verified by MATLAB simulation test.

Key words: AC-DC hybrid microgrid, power quality, interlinking converter (ILC), harmonic suppression, voltage stability

CLC Number:

TM727

KANG Qinze, LUO Zhaoxu, LIU Zeyu, MA Fanshuo, XIAO Feng. Optimization Control Strategy for Power Quality in AC-DC Hybrid Microgrid Based on Master-Slave ILC[J]. Hunan Electric Power, 2025, 45(2): 74-81.

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