A predictive direct power control method without the phase locked loop(PLL)is presented

the research object of which is the three-phase DC/AC converter. This method can achieve the deadbeat control of grid-connected power. In order to reduce the influence on the control performance by PLL

the method without PLL is realized. According to the two-beat delay resulting from the sampling control

the sampling frequency which is twice the carrier frequency is adopted to calculate the grid voltage

the grid-connected power and current after one cycle accurately. The output of the converter is calculated by the formula given in the paper. The deviation between the frequency set by the control system and the grid frequency has no influence on the performance of the control method proposed in this paper. The feasibility of the absence of phase locked loop(PLL)is demonstrated. The three-phase grid-connected converter simulation model and experimental prototype are built. The conversion from a control system simulation model into the C language program of DSP is realized by the Embedded Coder block of Simulink. The control method is validated and analyzed by simulation and experiment. This work is jointly supported by National Nature Science Foundation of China(No. 51577086)and Industry

Education and Scientific Research Joint Prospective Research Project of Jiangsu Province(No. BY2015009-03).