An electrical power system, comprising - a transmission system configured to transmit an electrical power having a first voltage; - a distribution network configured to distribute the electrical power having a second voltage and configured to be in an electrical and/or electromagnetic communication with the transmission system via a coupling unit having a coupling ratio; - at least one distributed generation unit DGU configured to generate the electric power and be in an electrical and/or electromagnetic communication with the distribution network, - a control unit configured to control the coupling unit at least in an emergency operating mode to bring and/or to keep ∘ the value of the first voltage in a voltage range between a first threshold Vtmin and a third threshold Vtmin' being greater than Vtmin by a predetermined first voltage amount δ, and/or ∘ the value of the second voltage in a voltage range between a second threshold Vdmax and a fourth threshold Vdmax' being less than Vdmax by a predetermined second voltage amount ∈; characterized in that - additionally to the control of the coupling unit the control unit is configured to control the at least one DGU to bring and/or to keep ∘ the value of the first voltage in the voltage range between the first threshold Vtmin and the third threshold Vtmin', and/or ∘ the value of the second voltage in the voltage range between the second threshold Vdmax and the fourth threshold Vdmax'; and - the control unit is further configured to determine the first threshold Vtmin corresponding to the value of the first voltage at the time of entry into the emergency operating mode and the second threshold Vdmax corresponding to the value of the second voltage at the time of entry into the emergency operating mode. - a transmission system configured to transmit an electrical power having a first voltage; - a distribution network configured to distribute the electrical power having a second voltage and configured to be in an electrical and/or electromagnetic communication with the transmission system via a coupling unit having a coupling ratio; - at least one distributed generation unit DGU configured to generate the electric power and be in an electrical and/or electromagnetic communication with the distribution network, - a control unit configured to control the coupling unit at least in an emergency operating mode to bring and/or to keep ∘ the value of the first voltage in a voltage range between a first threshold Vtmin and a third threshold Vtmin' being greater than Vtmin by a predetermined first voltage amount δ, and/or ∘ the value of the second voltage in a voltage range between a second threshold Vdmax and a fourth threshold Vdmax' being less than Vdmax by a predetermined second voltage amount ∈; characterized in that ∘ the value of the first voltage in a voltage range between a first threshold Vtmin and a third threshold Vtmin' being greater than Vtmin by a predetermined first voltage amount δ, and/or ∘ the value of the second voltage in a voltage range between a second threshold Vdmax and a fourth threshold Vdmax' being less than Vdmax by a predetermined second voltage amount ∈; - additionally to the control of the coupling unit the control unit is configured to control the at least one DGU to bring and/or to keep ∘ the value of the first voltage in the voltage range between the first threshold Vtmin and the third threshold Vtmin', and/or ∘ the value of the second voltage in the voltage range between the second threshold Vdmax and the fourth threshold Vdmax'; and ∘ the value of the first voltage in the voltage range between the first threshold Vtmin and the third threshold Vtmin', and/or ∘ the value of the second voltage in the voltage range between the second threshold Vdmax and the fourth threshold Vdmax'; and - the control unit is further configured to determine the first threshold Vtmin corresponding to the value of the first voltage at the time of entry into the emergency operating mode and the second threshold Vdmax corresponding to the value of the second voltage at the time of entry into the emergency operating mode.