A power supply system configured to couple to a power distribution bus of a marine vessel and to power a plurality of electric motors coupled to the power distribution bus. The power supply system includes a generator configured to generate electric power and a control system coupled to the generato
A power supply system configured to couple to a power distribution bus of a marine vessel and to power a plurality of electric motors coupled to the power distribution bus. The power supply system includes a generator configured to generate electric power and a control system coupled to the generator and configured to control the output voltage of the generator based on a voltage setpoint. The control system includes a measuring unit configured to measure a parameter of the electric power generated by the generator and a control unit configured to control the voltage setpoint for the output voltage of the generator based on the measured parameter.
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1. A power supply system configured to couple to a power distribution bus of a marine vessel and to power a plurality of electric motors coupled to the power distribution bus, the power supply system comprising: a generator configured to generate electric power and to provide, in operation, an outpu
1. A power supply system configured to couple to a power distribution bus of a marine vessel and to power a plurality of electric motors coupled to the power distribution bus, the power supply system comprising: a generator configured to generate electric power and to provide, in operation, an output voltage at an output of the generator, the output voltage being an AC voltage; anda control system coupled to the generator and configured to control the output voltage of the generator based on a voltage setpoint, wherein the voltage setpoint, in operation, is set to an operating voltage setpoint;wherein the control system comprises: a measuring unit configured to measure a parameter of the electric power generated by the generator, wherein a fault in a component coupled to the power supply system that results in a drop in voltage of the output of the generator is determinable based on the measured parameter; anda control unit configured to control the voltage setpoint for the output voltage of the generator based on the measured parameter, such that if a value of the parameter falls below a threshold, the voltage setpoint is reduced;wherein the control unit is further configured to gradually increase the voltage setpoint back to the operating voltage setpoint after the fault is electrically isolated from the power supply system, thereby limiting voltage overshoot and preventing tripping of electrical components coupled to the power distribution bus of the marine vessel. 2. The power supply system of claim 1, wherein the parameter is the output voltage at the output of the generator, and wherein the control unit is further configured to determine that a fault in the power supply system or in components coupled thereto exists if the output voltage at the output of the generator drops below a voltage threshold. 3. The power supply system of claim 1, wherein the parameter is the AC frequency of the output voltage at the output of the generator, and wherein the control unit is further configured to determine that a fault in the power supply system or in components coupled thereto exists if the AC frequency at the output of the generator drops below a frequency threshold. 4. The power supply system of claim 1, wherein the control unit is further configured to set the voltage setpoint to a starting voltage setpoint after the fault is determined, and to increase the voltage setpoint to the operating voltage setpoint thereafter. 5. The power supply system of claim 4, wherein the increase in the voltage setpoint from the starting voltage setpoint to the operating voltage setpoint occurs within a time period of between about 0.1 seconds and about 3 seconds. 6. The power supply system of claim 1, wherein the control unit comprises a protection controller and an automatic voltage regulator, wherein the protection controller comprises an interface to the automatic voltage regulator, wherein the protection controller is configured to generate a control signal for controlling the voltage setpoint and is further configured to supply the control signal to the automatic voltage regulator via the interface, and wherein the automatic voltage regulator is configured to determine the voltage setpoint from the control signal and to control a field voltage of the generator based on the determined voltage setpoint. 7. The power supply system of claim 1, wherein the control unit comprises an automatic voltage regulator, the automatic voltage regulator comprising a volts-per-Hertz limiter that limits the voltage setpoint based on an AC frequency of the output voltage of the generator, such that a lower AC frequency results in a lower limit for the voltage setpoint. 8. The power supply system of claim 6, wherein the automatic voltage regulator is coupled to the protection controller, wherein the automatic voltage regulator comprises a volts-per-Hertz limiter, and wherein the automatic voltage regulator is configured to control the voltage setpoint based on the control signal and, simultaneously, to limit the voltage setpoint by the volts-per-Hertz limiter based on an AC frequency of the output voltage of the generator. 9. The power supply system of claim 7, wherein at a nominal AC frequency, the voltage setpoint is limited to between 105% and 120% of the operating voltage setpoint, thereby defining a maximum ratio of the voltage setpoint to the AC frequency, wherein the volts-per-Hertz limiter is configured to limit the voltage setpoint such that the maximum ratio is not exceeded for all AC frequencies. 10. The power supply system of claim 1, wherein the control system is further configured to control the output voltage of the generator by controlling a field voltage of the generator. 11. A power system of a marine vessel, the power system comprising: a plurality of power supply systems, wherein each power supply system of the plurality of power supply systems is configured to couple to a power distribution bus of the marine vessel; anda power distribution bus divided into a plurality of sections, wherein each section of the plurality of sections is coupled to at least one power supply system of the plurality of power supply systems, wherein each section of the plurality of sections is connectable by bus tie breakers, and wherein the power distribution bus is configured to supply electric power generated by the plurality of power supply systems to a plurality of electric motors coupled to the power distribution bus;wherein each power supply system of the plurality of power supply systems comprises: a generator configured to generate electric power and to provide, in operation, an output voltage at an output of the generator, the output voltage being an AC voltage; anda control system coupled to the generator and configured to control the output voltage of the generator based on a voltage setpoint, wherein the voltage setpoint, in operation, is set to an operating voltage setpoint;wherein the control system comprises: a measuring unit configured to measure a parameter of the electric power generated by the generator, wherein a fault in a component coupled to the power supply system that results in a drop in voltage of the output of the generator is determinable based on the measured parameter; anda control unit configured to control the voltage setpoint for the output voltage of the generator based on the measured parameter, such that if a value of the parameter falls below a threshold, the voltage setpoint is reduced; wherein the control unit is further configured to gradually increase the voltage setpoint back to the operating voltage setpoint after the fault is electrically isolated from the power supply system, thereby limiting voltage overshoot and preventing tripping of electrical components coupled to the power distribution bus of the marine vessel. 12. The power system of claim 11, wherein each power supply system of the plurality of power supply systems is configured to limit a voltage overshoot occurring after a fault to less than 125% of a nominal operating voltage of the respective power supply system by the gradual increasing of the voltage setpoint after isolation of the fault, wherein the fault is selected from the group consisting of a fault in a power supply system, a fault in the power distribution bus, and a fault in a component coupled to the power supply system or the power distribution bus. 13. The power system of claim 11, wherein the power system is configured to open, after detection of the fault, the bus tie breakers of a section of the plurality of sections of the power distribution bus in which the fault occurred, thereby isolating the fault from power supply systems coupled to remaining sections of the plurality of sections of the power distribution bus. 14. The power system of claim 11, wherein the plurality of sections of the power distribution bus are connected in a ring configuration. 15. The power system of claim 11, wherein the marine vessel comprises a dynamically positioned vessel, wherein the power system comprises a dynamically positioning equipment class 3 power system having a class 3 mode of operation, and wherein the power system is configured to operate in the class 3 mode of operation with the bus tie breakers closed between the plurality of sections of the power distribution bus. 16. A method of operating a power supply system of a marine vessel, the power supply system being coupled to a power distribution bus of the marine vessel and configured to power a plurality of electric motors coupled to the power distribution bus, the power supply system comprising a generator and a control system configured to control an output voltage of the generator based on a voltage setpoint, the method comprising: operating the power supply system with the voltage setpoint set to an operating voltage setpoint;measuring a parameter of electric power generated by the generator, wherein a fault in a component coupled to the power supply system that results in a drop in voltage of the output of the generator is determinable based on the measured parameter; andreducing the voltage setpoint for the output voltage of the generator if the value of the parameter falls below a threshold, and gradually increasing the voltage setpoint back to the operating voltage setpoint after the fault is electrically isolated from the power supply system, thereby limiting voltage overshoot and preventing tripping of electrical components coupled to the power distribution bus of the marine vessel. 17. The method of claim 16, wherein: the generator is configured to generate electric power and to provide, in operation, an output voltage at an output of the generator, the output voltage being an AC voltage; andthe voltage setpoint is set, in operation, to an operating voltage setpoint;the control system comprises: a measuring unit configured to measure the parameter of the electric power generated by the generator; anda control unit configured to control the voltage setpoint for the output voltage of the generator based on the measured parameter. 18. The power supply system of claim 4, wherein the increase in the voltage setpoint from the starting voltage setpoint to the operating voltage setpoint occurs within a time period of between about 0.5 seconds and about 2 seconds. 19. The power supply system of claim 7, wherein the automatic voltage regulator is coupled to the protection controller, wherein the automatic voltage regulator comprises a volts-per-Hertz limiter, and wherein the automatic voltage regulator is configured to control the voltage setpoint based on the control signal and, simultaneously, to limit the voltage setpoint by the volts-per-Hertz limiter based on AC frequency of the output voltage of the generator. 20. The power supply system of claim 9, wherein at the nominal AC frequency, the voltage setpoint is limited to about 110% of the operating voltage setpoint. 21. The power system of claim 12, wherein each power supply system of the plurality of power supply systems is configured to limit the voltage overshoot occurring after the fault to less than 120% of the nominal operating voltage.
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