Voltage source inverter and power generation system

A power generation system, comprising:

• a first voltage source inverter and a second voltage source inverter, each comprising:
• an inner control loop comprising a setpoint input configured to receive a setpoint signal comprising one of a first setpoint signal and a second setpoint signal for an active power component within the respective voltage source inverter, and an actual value input configured to receive a actual value of the active power component of the voltage source inverter, the inner control loop comprising a control circuit comprising a proportional circuit component and an integral circuit component and wherein the control circuit is configured to determine a frequency shift as a control output variable from a difference between the setpoint signal and the current actual value, wherein the voltage source inverter is configured to provide an AC voltage which deviates from a predetermined fundamental frequency by the determined frequency shift, and—an outer control loop configured to supply the second setpoint signal to the setpoint input as a function of the determined frequency shift in an islanded operation of a power generation system containing the voltage source inverter, wherein the second voltage source inverter is connected in parallel with the first voltage source inverter on an AC side thereof, wherein the control circuit is common to both the first and second voltage source inverters and supplies individual setpoint signals to the first and second voltage source inverters at their respective setpoint inputs in a grid-connected operation of the power generation system, and further supplies status signals in order to switch the first and second voltage source inverters between a grid-connected operation and an islanded operation of the power generation system.