This paper presents a digital automatic synchronizer which adopts DSP as microprocessor to improve the calculation speed and accuracy of float data. This device adjusts the generator voltage and frequency by means of fuzzy control technology in order to achieve switch condition rapidly and smoothly. This paper also provides a way of forecasting difference of angle by means of linear interpolation algorithm which can grasp rapidly and reliably synchronization opportunity, in addition, it has functions of event record and wave record. The testing indicates that this device can realize synchronization operation of the generator and grid high accuracy, rapidly, reliable, smoothly.
