Analysis and calculation of the instantaneous power based on a new method of load identification

Recently, there are some nonlinear circuit level definitions based upon Maxwell´s equations and the Poynting vector. However, instantaneous power theory based upon Poynting theorem is not suitable for circuit with gradual change load. This paper presents a new load identification method. The load is equivalent to the resistance and capacitance in parallel. This method can identify the nonlinear circuit with gradual change load. The analysis and calculation of the instantaneous power based on this method related with the realistic energy flow is defined.