The Control Strategy Study of Three-phase Phase-locked Loop

In the operation of power grid, the premise of effective control of the whole system is to obtain and track the phase of power voltage. In order to obtain good tracking effect, the control strategy of three-phase phase-locked loop technology has been studied and designed. In this paper, three function modules of three-phase phase-locked loop have been studied: phase discriminator, voltage-controlled oscillator and loop filter. And the mathematical model of three-phase phase-locked loop has been established by MATLAB. At the same time, the three-phase phase-locked loop technology has been optimized designed by FPGA(Field-programmable Gate Array). Through two kinds of simulations of the three-phase phase-locked loop in complex environment, the model of the three-phase phase-locked loop, circuit and parameter settings making the system perform well and fully meet the rapid and accurate requirements of control system.