TIAN Yanjun, GAO Haonan, WANG Yi, et al. Hierarchical Optimization MPPT Control Strategy for Independent-input Series-output-type Photovoltaic DC Collection System with Uneven Illumination[J]. 2020, 46(10): 3552-3562.
TIAN Yanjun, GAO Haonan, WANG Yi, et al. Hierarchical Optimization MPPT Control Strategy for Independent-input Series-output-type Photovoltaic DC Collection System with Uneven Illumination[J]. 2020, 46(10): 3552-3562.DOI:
In order to solve the overvoltage problem and MPPT control failure problem of an independent-input series-output-type photovoltaic DC collection system when the illumination is uneven
we propose a layered optimization MPPT control strategy. By judging and switching the operation mode of the DC-DC converter
the strategy coordinates the MMC converter on the AC side to flexibly adjust the DC bus voltage within a certain operating range to realize the hierarchical control of DC-DC converters and grid-side inverters. Finally
the effectiveness of the strategy is verified by simulation of three modules cascaded in MATLAB/Simulink. The research results show that the proposed control strategy can optimize the power between modules under various operating conditions with uneven illumination
and improve the output power of the entire photovoltaic system. The research results can provide theoretical basis for the stable operation and power optimization of the photovoltaic DC collection system.