The grid connection inverter with traditional power-current control has such interactive stability issue as harmonic oscillation etc

which limits the grid connection level of new energy and is more prominent especially in weak AC network.To overcome the above shortcomings

a kind of new power-voltage control strategy is proposed.Firstly

the dynamic model of the inverter output impedance is set up in the rotating dq coordinate system

including the main circuit parameters

dynamic parameters of PLL parameter of regulator.Then

the stability of the proposed power-voltage control strategy is proved by way of analyzing the frequency characteristics of the output impedance of the inverter under the traditional power current control strategy and the power voltage control strategy proposed in this paper on the basis of bode diagram

which can reduce the influence of PLL band width and out power

thus improving the injection power of the rated power of the inverter in the weak grid.Finally

the effectiveness of the proposed control strategy is verified by the simulation and experimental result.