An improved algorithm for on-line tracking Thevenin equivalent parameters based on deviation correction

Based on the method for on-line tracking Thevenin equivalent parameters, an iterative algorithm using the deviation correction method is proposed and the initial value by consistency test is chosen. The expression and correction of estimate parameters are derived, the direction of the corrected value is judged according to the real-time changing data, and the iteration parameter estimation is obtained through iteration and correction. At the same time, the Thevenin equivalent resistance is concerned which makes whole estimation be conducted in vector space. The simulation results show that this method can quickly and efficiently track the estimated Thevenin equivalent parameters by only using one sampling frequency cycle.