Techniques for using an energy storage system as soft starter for large inductive devices
AssigneeCaterpillar Inc.
InventorsL S N V A Vinaykumar Gullapudi, Shraddha Betageri
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Abstract
A Battery Energy Storage System (BESS) may be used to assist with the startup of large electromagnetic devices, such as including inductive loads, to reduce inrush current. By leveraging the BESS, the described techniques allow for a controlled ramp-up of voltage and frequency to emulate a Voltage/Frequency (V/f) starting method for motors and a gradual energization for transformers. This approach minimizes voltage sags and mitigates inrush currents, thereby enhancing the stability of the power system and reducing the risk of tripping protection devices.
Claims20
A system for reducing an inrush current of an electromagnetic device coupled with an energy storage system through a second bus, the system comprising:
- a controller in electrical communication with a plurality of motorized breakers, the plurality of motorized breakers configured for selectively connecting or isolating the electromagnetic device between the first bus and a second bus, wherein a mains supply is coupled with the electromagnetic device through the first bus, the controller configured for:
- ramping an output of the energy storage system from first voltage and frequency levels to second voltage and frequency levels;
- synchronizing an output parameter of the energy storage system with the mains supply prior to connecting the first bus and the second bus;
- controlling the plurality of motorized breakers to connect the electromagnetic device to the energy storage system and the mains supply so as to limit inrush current;
- and
- maintaining a coupling between the energy storage system and the first bus after connecting the electromagnetic device to the energy storage system and the mains supply to provide continuous grid support.
A method for reducing an inrush current of an electromagnetic device, the method comprising:
- ramping an output of an energy storage system from first voltage and frequency levels to second voltage and frequency levels;
- synchronizing an output parameter of the energy storage system with a mains supply prior to connecting a first bus and a second bus;
- and
- controlling a plurality of motorized breakers to sequentially connect the electromagnetic device to the energy storage system and the mains supply so as to limit inrush current;
- and
- maintaining a coupling between the energy storage system and the first bus after connecting the electromagnetic device to the energy storage system and the mains supply to provide continuous grid support.
A system for reducing an inrush current of an inductive load coupled with an energy storage system through a second bus, the system comprising:
- a controller in electrical communication with a plurality of motorized breakers, the plurality of motorized breakers configured for selectively connecting or isolating the inductive load between a first bus and the second bus, wherein a mains supply is coupled with the inductive load through the first bus, the controller configured for:
- ramping an output of the energy storage system from first voltage and frequency levels to second voltage and frequency levels;
- synchronizing an output parameter of the energy storage system to the mains supply prior to connecting the first bus and the second bus;
- controlling the plurality of motorized breakers to connect the inductive load to the energy storage system and the mains supply so as to limit inrush current;
- and
- maintaining the coupling between the energy storage system and the first bus after connecting the inductive load to the energy storage system and the mains supply to provide continuous grid support.
Dependencies are inferred from the claim text.