Maximum Power Point Tracking of Merchant Marine Photovoltaic System Based on MFAC
To optimize the efficiency and the stability of output power with time-varying pho-tovoltaic(PV)panels model parameters under complex oceanic condition,ship rolling and salt crystallization,an MPPT(maximum power point tracking)of merchant marine photo-voltaic system based on MFAC(model free adaptive control)is adopted.Firstly,the general discrete non-linear system is established relative to the input and output of PV system;Sec-ondly,the compact form dynamic linearization data model is utilized to design the MFAC controller;Finally,the pseudo partial derivative estimation algorithm is proposed.Com-pared with the contrast simulation,the proposed method improves the stability of the PV system output power.The MPPT time with MFAC and perturbation and observation(P&O)method are 0.1,0.3 s,respectively,power oscillation amplitude are 5,18 W under 25℃environment temperature and irradiance of 900 W·m-2.When the irradiance changes to 500 W·m-2 at 2 s,the MPPT time with MFAC and P&O are 0.02 and 0.06 s,respec-tively,and the power oscillation amplitude are 100 and 300 W,respectively.It can be seen that the MPPT based on MFAC can improve the speed tracking performance of ship PV sys-tem,which verifies the effectiveness and superiority of the proposed method.
ship microgridphotovoltaic power generationmaximum power point trackingmodel free adaptive control
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