Analysis of Novel IpDFT Method for Frequency Estimation with Step-Changed Parameters

In order to make the system more stable and run more accurately and quickly, frequency estimation is used in many fields, especially in three-phase power system. However, the time-varying signals often suffer from the parameters step change due to external influences that may cause errors in the parameter estimation. In this paper, a novel method using the proposed derived equations is proposed, which can eliminate the influence of step-changed parameters on the estimation of frequency in real-valued sinusoid signal. Through MATLAB simulation, it could be seen that the performance of our proposed method is quite good and the MSE value can be as low as about −80 dB.