Seven-parameter photovoltaic cell output characteristic modeling method based on STFT (Short Time Fourier Transform) operator

The invention discloses a seven-parameter photovoltaic cell output characteristic modeling method based on an STFT (Short Time Fourier Transform) operator. The method comprises the steps of establishing an equivalent circuit initial model of photovoltaic cell output characteristics; defining the STFT operator to obtain a decoupling explicit equation parameter model of a photovoltaic cell; establishing a nonlinear equation set by using standard working condition basic data provided by a photovoltaic cell manufacturer, and calculating unknown parameters by using a solution algorithm; calculating unknown parameter values of the decoupling explicit equation parameter model under given working conditions; bringing the unknown parameter values under the given working conditions in the decoupling explicit equation parameter model of the photovoltaic cell to obtain a final photovoltaic cell model which comprehensively reflects photovoltaic cell output characteristics under the given working conditions. The method has the beneficial effects that the STFT operator adopted for model decoupling is not limited by a domain of definition, the expected STFT decoupling operator calculation accuracy can be set according to the needs, and the application is more flexible.