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 . <EOS>