The controller uses the DSP chip as the core, can realize the fast AC sampling, to ensure the synchronization device fast, smooth the generator voltage, frequency regulation to the allowable value, the frequency difference, pressure difference requirement, calculation of phase difference and the closing leading angle prediction, can quickly, accurately capture the synchronization point, realization automatic quasi synchronizing parallel operation of generator and power system is accurate, fast, reliable. Compared with similar devices, has simple hardware, high integration, high reliability, perfect performance etc.. Device also can be used to predict phase, to be electric, frequency synchronization object variable parameter adjustment, improve the precision and the network speed.