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At least one embodiment of the invention generally relates to a drive system for a facility having an alternating-current isolated network, in particular for a ship or an offshore platform, including a three-phase drive machine, which can be operated both as a motor and as a generator, and including

At least one embodiment of the invention generally relates to a drive system for a facility having an alternating-current isolated network, in particular for a ship or an offshore platform, including a three-phase drive machine, which can be operated both as a motor and as a generator, and including a converter having a direct-current intermediate circuit having an intermediate circuit voltage. At least one embodiment of the invention aims to provide a way of avoiding undesired and/or impermissible voltage and/or frequency increases in the alternating-current isolated network. For this purpose, the drive system includes according to the invention an energy absorbing device arranged in the intermediate circuit, which energy absorbing device includes at least one energy absorber, which preferably includes at least one electrical resistor, for absorbing at least a part of the electrical energy that the three-phase drive machine generates in generator operation and outputs to the intermediate circuit by way of the motor-side current converter of the converter. The energy absorber can be activated by the energy absorbing device according to the polarity of the intermediate circuit voltage. The energy absorbing device is preferably variable regarding an absorption of electrical braking power of the three-phase drive machine.

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1. A drive system for a facility having an alternating-current isolated network, comprising a three-phase drive machine, operatable both as a motor and as a generator;a converter including a direct-current intermediate circuit including an intermediate circuit voltage, the converter including a netw

1. A drive system for a facility having an alternating-current isolated network, comprising a three-phase drive machine, operatable both as a motor and as a generator;a converter including a direct-current intermediate circuit including an intermediate circuit voltage, the converter including a network-side current converter and a machine-side current converter, the network-side current converter being connectable on an input side to the alternating-current isolated network and being connected on an output side to the direct-current intermediate circuit, and a motor-side current converter being connected on an input side to the direct-current intermediate circuit and on an output side to the three-phase drive machine, the three-phase drive machine being capable drawing electrical energy from the alternating-current isolated network in motor operation via the converter and being capable of generating electrical energy in generator operation and outputting said electrical energy to the intermediate circuit via the motor-side current converter; andan energy absorbing device arranged in the intermediate circuit and comprising at least one energy absorber which includes at least one ohmic resistor, to absorb at least a part of the electrical energy which the three-phase drive machine generates in generator operation and outputs via the motor-side current converter to the intermediate circuit, the at least one energy absorber being activatable by the energy absorbing device at least as a function of the polarity of the intermediate circuit voltage, wherein, in order to activate the at least one energy absorber, the energy absorbing device includes a diode which is connected in series with the energy absorber and is polarized in such a way that it is conductive with a polarity of the intermediate circuit voltage present during generator operation and blocks with a polarity of the intermediate circuit voltage present during motor operation. 2. A drive system for a facility having an alternating-current isolated network, comprising a three-phase drive machine, operatable both as a motor and as a generator;a converter including a direct-current intermediate circuit including an intermediate circuit voltage, the converter including a network-side current converter and a machine-side current converter, the network-side current converter being connectable on an input side to the alternating-current isolated network and being connected on an output side to the direct-current intermediate circuit, and a motor-side current converter being connected on an input side to the direct-current intermediate circuit and on an output side to the three-phase drive machine, the three-phase drive machine being capable drawing electrical energy from the alternating-current isolated network in motor operation via the converter and being capable of generating electrical energy in generator operation and outputting said electrical energy to the intermediate circuit via the motor-side current converter; and an energy absorbing device arranged in the intermediate circuit and comprising at least one energy absorber which includes at least one ohmic resistor, to absorb at least a part of the electrical energy which the three-phase drive machine generates in generator operation and outputs via the motor-side current converter to the intermediate circuit, the at least one energy absorber being activatable by the energy absorbing device at least as a function of the polarity of the intermediate circuit voltage, wherein, in order to activate the at least one energy absorber, the energy absorbing device includes a controllable power electronic semiconductor switch which is connected in series with the energy absorber and is polarized in such a way that it is switchable to a conductive state with a polarity of the intermediate circuit voltage present during generator operation and blocks with a polarity of the intermediate circuit voltage present during motor operation. 3. The drive system as claimed in claim 1, wherein the energy absorbing device is configured to be variable with regard to an absorption of electrical braking power of the three-phase drive machine. 4. The drive system as claimed in claim 3, wherein, in order to vary the absorption of electrical braking power of the three-phase drive machine, the energy absorbing device includes for at least some of the energy absorbers a respective switch connected in series or in parallel with the respective energy absorber. 5. The drive system as claimed in claim 4, wherein the switch or switches are in the form of power electronic semiconductor switches. 6. The drive system as claimed in claim 2, wherein the power electronic semiconductor switch is in the form of a reverse-blocking power electronic component. 7. The drive system as claimed in claim 3, wherein, in order to vary the absorption of electrical braking power of the three-phase drive machine, at least one of the energy absorbers is in the form of a continuously variable ohmic resistor. 8. The drive system as claimed in claim 3, further comprising: a monitoring and control device to at least one of control and regulate the absorption of braking power of the three-phase drive machine by the energy absorbing device as a function of a desired reference braking torque of the three-phase drive machine and as a function of actual values of the drive system. 9. The drive system as claimed in claim 1, wherein the three-phase drive machine includes a power in the single-digit or multi-digit megawatt range. 10. The drive system as claimed in claim 1, wherein the at least one energy absorber is in the form of an energy store. 11. The drive system of claim 1, wherein the drive system is for a ship or an offshore platform. 12. The drive system as claimed in claim 6, wherein the power electronic semiconductor switch is in the form of a thyristor. 13. The drive system as claimed in claim 5, wherein the power electronic semiconductor switch is in the form of a reverse-blocking power electronic component. 14. The drive system as claimed in claim 13, wherein the power electronic semiconductor switch is in the form of a thyristor. 15. The drive system as claimed in claim 2, wherein the energy absorbing device is configured to be variable with regard to an absorption of electrical braking power of the three-phase drive machine. 16. The drive system as claimed in claim 15, wherein, in order to vary the absorption of electrical braking power of the three-phase drive machine, the energy absorbing device includes for at least some of the energy absorbers a respective switch connected in series or in parallel with the respective energy absorber. 17. The drive system as claimed in claim 16, wherein the switch or switches are in the form of power electronic semiconductor switches. 18. The drive system as claimed in claim 15, wherein, in order to vary the absorption of electrical braking power of the three-phase drive machine, at least one of the energy absorbers is in the form of a continuously variable ohmic resistor. 19. The drive system as claimed in claim 15, further comprising: a monitoring and control device to at least one of control and regulate the absorption of braking power of the three-phase drive machine by the energy absorbing device as a function of a desired reference braking torque of the three-phase drive machine and as a function of actual values of the drive system. 20. The drive system as claimed in claim 2, wherein the three-phase drive machine includes a power in the single-digit or multi-digit megawatt range. 21. The drive system as claimed in claim 2, wherein the at least one energy absorber is in the form of an energy store. 22. The drive system of claim 2, wherein the drive system is for a ship or an offshore platform. 23. The drive system as claimed in claim 2, wherein the power electronic semiconductor switch is in the form of a reverse-blocking power electronic component.