Design of a Digital Phase-locked Loop Based on DSP

This paper focused on the principle of phase-locked loop(PLL),and introduced the modeling and parameter design in detail.The traditional PLL which influenced the phase demodulation errors of inverters with no control interconnection were studied.Meanwhile,it designed a digital phase-locked loop(DPLL) based on DSP using the concept of digital phase-locking.The tracking of the phase and frequency in paralleled inverter can be realized effectively and rapidly by using DPLL.Besides,the parallel operation of inverters with no interconnection is solved.The simulation data of this method keep consistent with the phase,frequency and amplitude.The efficiency of the DPLL was proven by experiments and simulations.