Dead Time Compensation for General-Purpose Inverters Based on Resampling and Feedback Theory

In this paper a method is proposed for compensating the dead-time in a synchronous rotating reference frame, which is suitable for general-purpose inverters. This method for digital harmonic detection is based on resampling and feedback theory, and a digital harmonic detecting system is designed. According to feedback theory, a filter can be designed to take the direct current Ip (Iq), and ip (iq) before a low-pass filter can be resampled based on the resampling theory. Through this digital system the harmonic currents in a power system can be detected timely and accurately. The system simulation shows that this filter not only takes advantages of digital filters in accuracy, but also overcomes the bad performance of digital filters in dynamics, and can fellow the measured signal in real time.