Optimal control strategy of neutral-point potential for three-level active neutral-point-clamped microgrid energy storage converter
HU Cun-gang
DENG Na
ZHANG Yun-lei
WANG Qun-jing
LUO Fang-lin
Abstract：An optimal control strategy of the neutral point potential (NP) balancing for the three-level active neutral point clamped (3L-ANPC) micro grid energy storage converter is proposed in this paper. Due to the three-level half-wave symmetric selected harmonic elimination pulse width modulation (SHEPWM) equation has multiple solutions, and the corresponding switch state vectors of different solutions are different. The switching state vectors of the SHEPWM equation and their influences on the NP are studied. The NP balancing can be effectively controlled by choosing appropriate solutions in every fundamental period. The proposed control strategy can eliminate specific low order harmonics and also effectively control the fluctuation of NP. Therefore, the grid-connected output power quality is improved and the requirement of the output filter is reduced. Finally, the simulation model and experimental platform of three-level active neutral point clamped micro grid energy storage converter are built to verify the proposed control strategy. The simulation and experimental results are provided to verify the effectiveness of the proposed control strategy.
Keywords：microgrid energy storagepower convertersactive neutral point clampedneutral-point potential balancingselective harmonic elimination
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 1092-1103 )