A Voltage-Frequency Central Difference Kalman Filter Detection Algorithm Based on d-q Coordinate Transformation

摘要

It is important to track and measure the amplitude and frequency of fundamental wave in AC grid accurately and rapidly. Especially on the conditions of variety interference signal. The traditionally method of filtration by software algorithm not only complex but also with low operation speed nor calculation accuracy. In this study, a nonlinear voltage-frequency detection mathematical model based on d-q coordinate transformation is presented, the Central Difference Kalman Filter (CDKF) algorithm is applied to the detection system. The simulation results show that the CDKF algorithm features high measuring precision and the calculating speed can significantly improved without external interference.