Systems and methods for implementing series compensators in static UPS
AssigneeABB Schweiz AG
InventorsRaghothama Reddy, Silvio Colombi, William J. Schmitt, John P. Skliutas
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Abstract
A system is provided. The system includes a plurality of uninterruptible power supplies (UPSs), a ring bus, a plurality of chokes, each choke of said plurality of chokes electrically coupled between a respective UPS of said plurality of UPSs and the ring bus, and a plurality of series compensators, each series compensator of the plurality of series compensators electrically coupled between an associated choke of the plurality of chokes and the ring bus.
Claims17
A system comprising:
- a plurality of static uninterruptible power supplies (UPSs);
- a ring bus,
- a plurality of chokes, each choke of said plurality of chokes electrically coupled between a respective static UPS of said plurality of static UPSs and said ring bus;
- and
- a plurality of series compensators, each series compensator of said plurality of series compensators electrically coupled between an associated choke of said plurality of chokes and said ring bus wherein each series compensator of said plurality of series compensators comprises (i) a capacitor and
- (ii) a bypass switch electrically coupled in parallel with said capacitor, said bypass switch configured to close in response to a fault occurring on said ring bus.
A controller for controlling a power supply system that includes a plurality of static uninterruptible power supplies (UPSs), a ring bus, a plurality of chokes, and a plurality of series compensators, each choke of the plurality of chokes electrically coupled between a respective static UPS of the plurality of static UPSs and the ring bus, and each series compensator of the plurality of series compensators electrically coupled between an associated choke of the plurality of chokes and the ring bus and including a capacitor and a bypass switch electrically coupled in parallel with the capacitor, said controller comprising:
- a processor;
- and
- a memory device communicatively coupled to said processor, said memory device storing executable instructions configured to cause said processor to:
- determine a charge level of the capacitor included in each series compensator of the plurality of series compensators that is associated with the occurrence of a fault on the ring bus;
- monitor operation and the charge levels of the capacitors;
- determine a fault on the ring bus has occurred based on the charge level of one of the capacitors;
- and
- control the bypass switch electrically coupled in parallel with the one of the capacitors based on the occurrence of the fault.
A method of protecting a power supply system that includes a plurality of static uninterruptible power supplies (UPSs) and a ring bus from a fault, the method comprising:
- electrically coupling a choke between each static UPS of the plurality of static UPSs and the ring bus;
- and
- electrically coupling a series compensator that includes (i) a capacitor and (ii) a bypass switch electrically coupled in parallel with the capacitor, the bypass switch configured to close in response to a fault occurring on the ring bus, between each choke and the ring bus.
Dependencies are inferred from the claim text.