A device , comprising: - a first inverter , wherein the first inverter is configured to invert a DC input voltage into an AC output voltage; - a first controller , wherein the first controller is configured to provide a first reference voltage for the first inverter on the basis of an AC output current of the first inverter ; - a second inverter , wherein the second inverter is configured to invert a DC input voltage into an AC output voltage; - a second controller, wherein the second controller is configured to provide a second reference voltage for the second inverter on the basis of an AC output current of the second inverter ; - wherein the first inverter and the first controller form a first Hopf oscillator, - wherein the second inverter and second controller form a second Hopf oscillator, and - wherein the first Hopf oscillator is coupled to the second Hopf oscillator; characterized in that : - the first inverter and/or the second inverter is a three-phase inverter, comprising three half-bridges and three filters, comprising L, LCL, and LC filters, wherein the first inverter and the second inverter are connected in parallel to a common AC bus; - wherein the first inverter and the second inverter are in non-mutual communication; and - wherein the first controller and the second controller are configured to generate the first and second reference voltage according to: { V ̇ α = r 2 − V α 2 + V β 2 V α − ωV β − ki α V ̇ β = r 2 − V α 2 + V β 2 V β + ωV α + ki β , wherein i αβ is the output current of the each inverter, after a Clarke transformation, V αβ is the controller output reference voltage, r is a steady state amplitude of oscillation of the each Hopf oscillator, ω is the frequency of each Hopf oscillator, respectively, k is a steady state current gain . - a first inverter , wherein the first inverter is configured to invert a DC input voltage into an AC output voltage; - a first controller , wherein the first controller is configured to provide a first reference voltage for the first inverter on the basis of an AC output current of the first inverter ; - a second inverter , wherein the second inverter is configured to invert a DC input voltage into an AC output voltage; - a second controller, wherein the second controller is configured to provide a second reference voltage for the second inverter on the basis of an AC output current of the second inverter ; - wherein the first inverter and the first controller form a first Hopf oscillator, - wherein the second inverter and second controller form a second Hopf oscillator, and - wherein the first Hopf oscillator is coupled to the second Hopf oscillator; - the first inverter and/or the second inverter is a three-phase inverter, comprising three half-bridges and three filters, comprising L, LCL, and LC filters, wherein the first inverter and the second inverter are connected in parallel to a common AC bus; - wherein the first inverter and the second inverter are in non-mutual communication; and - wherein the first controller and the second controller are configured to generate the first and second reference voltage according to: { V ̇ α = r 2 − V α 2 + V β 2 V α − ωV β − ki α V ̇ β = r 2 − V α 2 + V β 2 V β + ωV α + ki β , wherein i αβ is the output current of the each inverter, after a Clarke transformation, V αβ is the controller output reference voltage, r is a steady state amplitude of oscillation of the each Hopf oscillator, ω is the frequency of each Hopf oscillator, respectively, k is a steady state current gain . <EOS>