@Article{ee.2025.068714,
AUTHOR = {Feng Zhao, Haonan Xu, Xiaoqiang Chen, Ying Wang},
TITLE = {Power Balance Control Strategy of Cascaded H-Bridge Multilevel Inverter Based on Improved Harmonic Injection},
JOURNAL = {Energy Engineering},
VOLUME = {122},
YEAR = {2025},
NUMBER = {12},
PAGES = {4987--5000},
URL = {http://www.techscience.com/energy/v122n12/64604},
ISSN = {1546-0118},
ABSTRACT = {The cascaded H-bridge (CHB) multilevel inverter has become one of the most widely used PV inverter topologies due to its high voltage processing capability and high quality output power. Grid-connected PV system due to external conditions such as PV panel shading, PV component damage, can lead to PV output power imbalance, triggering the system over-modulation phenomenon, which in turn leads to grid-connected current waveform distortion. To this end, an improved power balance control strategy is proposed in this paper. Firstly, according to the different modulation ratios of each H-bridge module, a suitable harmonic injection method is used to keep the peak value of the modulating waveform always at 1; then an inverse triangular trapezoidal waveform is injected to optimize the modulating waveform, which further improves the output voltage waveform, reduces the THD value of the grid-connected currents, and maintains the stability of power inside the CHB system. Purpose. Simulation verifies the effectiveness and feasibility of this power balance control strategy.},
DOI = {10.32604/ee.2025.068714}
}