Aimed at the problem that the photovoltaic inverter with harmonic compensation can only compensate the harmonics from local non-linear load and cannot participate in the harmonic control of the power grid and it is difficult to measure the contribution of the harmonic control

this paper proposes a new virtual-resistance-type photovoltaic inverter

which can suppress the low-order harmonic voltages at point of common coupling(PCC). The suppressing impact of resistance on PCC harmonic voltages and power system resonance is analyzed. Based on it

the control method of virtual-resistance-type photovoltaic inverter is proposed. PI controllers are used to obtain the harmonic voltages and corresponding harmonic currents got by fast Fourier transformation on PCC voltages and grid-connected currents are in the same phase and differed by Kh in amplitudes

which makes photovoltaic inverter equal to a “virtual resistance”. Absorbed harmonic power is selected to measure the contributions to harmonic control

and Kh is adjusted automatically in the criteria of absorbed harmonic power maximization. The simulation and experiment results show that the proposed virtual-resistance-type inverter can be used for power generation

suppressing low-order harmonic voltages at PCC.