System for transmitting electrical power, having - a unidirectional rectifier which can be connected to a first AC voltage network, - a converter system which is connected to the unidirectional rectifier via a DC voltage connection, wherein an electrical power from an AC voltage source can be converted, by means of the converter system, into a transmission power comprising a DC component and an AC component and can be fed into the DC voltage connection, and - a coupling device for coupling the AC component of the transmission power from the DC voltage connection and for feeding the AC component into the first AC voltage network, characterized in that the coupling device comprises a frequency converter for transforming a frequency, an amplitude and a phase angle of the AC component, wherein the frequency converter can be connected, on the input side, to the DC voltage connection in a manner connected in parallel with the unidirectional rectifier and can be connected, on the output side, to the first AC voltage network, wherein a first input-side AC voltage connection of the frequency converter can be connected to a first DC voltage pole of the DC voltage connection via a first capacitance, and a second input-side AC voltage connection of the frequency converter can be connected to a second DC voltage pole of the DC voltage connection via a second capacitance. - a unidirectional rectifier which can be connected to a first AC voltage network, - a converter system which is connected to the unidirectional rectifier via a DC voltage connection, wherein an electrical power from an AC voltage source can be converted, by means of the converter system, into a transmission power comprising a DC component and an AC component and can be fed into the DC voltage connection, and - a coupling device for coupling the AC component of the transmission power from the DC voltage connection and for feeding the AC component into the first AC voltage network, characterized in that the coupling device comprises a frequency converter for transforming a frequency, an amplitude and a phase angle of the AC component, wherein the frequency converter can be connected, on the input side, to the DC voltage connection in a manner connected in parallel with the unidirectional rectifier and can be connected, on the output side, to the first AC voltage network, wherein a first input-side AC voltage connection of the frequency converter can be connected to a first DC voltage pole of the DC voltage connection via a first capacitance, and a second input-side AC voltage connection of the frequency converter can be connected to a second DC voltage pole of the DC voltage connection via a second capacitance. the coupling device comprises a frequency converter for transforming a frequency, an amplitude and a phase angle of the AC component, wherein the frequency converter can be connected, on the input side, to the DC voltage connection in a manner connected in parallel with the unidirectional rectifier and can be connected, on the output side, to the first AC voltage network, wherein a first input-side AC voltage connection of the frequency converter can be connected to a first DC voltage pole of the DC voltage connection via a first capacitance, and a second input-side AC voltage connection of the frequency converter can be connected to a second DC voltage pole of the DC voltage connection via a second capacitance.