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Abstract Based on the stability analysis methodology for cascade converters,the photovoltaic (PV) interface stability of current-fed (CF) maximum power point tracking (MPPT) converter adding input capacitor is studied,and the interface voltage control loop design guideline is given in this paper. The interface stability criterion of cascade system composed of PV cells and the MPPT converter is deduced at first,and then the output impedance of photovoltaic cells and the closed-loop input impedance of the Boost converter adding input capacitor are analyzed. According to the stability criterion proposed here,the stability conditions and the design guideline are derived. The design guideline shows that the controller parameter of the CF MPPT converter should be design under the minimum interface voltage. If the design guideline is followed,the converter will maintain the PV interface stability in the entire input voltage range for the MPPT converter. The validity of the theoretical analysis is verified by the experiments on a 150W prototype.
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Received: 06 September 2012
Published: 11 December 2013
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2013, Vol. 28 
