# US 2019/0173313 A1 · Isolated parallel ups system with choke bypass switch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173313 A1 - Document ID: US20190173313A1 - Status: Published application - Kind: A1 - Application number: 16/267,374 - Filed: 2019-02-04 - Published: 2019-06-06 - Earliest claimed: 2016-09-13 - Assignees: ABB Schweiz AG - Applicants: ABB Schweiz AG - Inventors: Lorenzo Giuntini; Andrea Mannuccini; Silvio Colombi - Web page: https://patentgrep.com/patent/US20190173313A1 ## CPC - H02J 9/062: {for AC powered loads} - H01H 85/46: Circuit arrangements not adapted to a particular application of the protective device - H02H 1/0007: {concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445)} - H02H 3/05: with means for increasing reliability, e.g. redundancy arrangements {(for logic circuits H03K19/003)} - H02H 3/08: responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) - H02H 7/20: for electronic equipment (for converters H02H7/10; for electric measuring instruments G01R1/36; for DC voltage or current semiconductor regulators G05F1/569; for amplifiers H03F1/52; for electronic switching circuits H03K17/08) - H02H 7/266: {involving switching on a spare supply (in general H02J9/00)} - H02J 9/061: {for DC powered loads} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) ## Abstract An uninterruptible power supply (UPS) system is provided. The UPS system includes a plurality of UPSs, a ring bus coupled to the UPSs, a plurality of chokes, and at least one static switch coupled between an associated UPS of the UPSs and the ring bus. Each choke electrically couples an associated UPS to the ring bus. The static switch is switchable to selectively bypass at least one choke. ## Claims ### Claim 1 An uninterruptible power supply (UPS) system comprising: a plurality of UPSs; a ring bus coupled to said plurality of UPSs; a plurality of chokes, each choke of said plurality of chokes electrically coupling a respective UPS of said plurality of UPSs to said ring bus; and at least one static switch coupled between an associated UPS of said plurality of UPSs and said ring bus, said at least one static switch switchable to selectively bypass at least one choke of said plurality of chokes. ### Claim 2 (depends on 1) The UPS system in accordance with claim 1, wherein said at least one static switch is selectively switchable to bypass said at least one choke in response to a fault occurring at said associated UPS. ### Claim 3 (depends on 2) The UPS system in accordance with claim 2 further comprising a first fuse coupled to said associated UPS, wherein said first fuse electrically disconnects said associated UPS from said ring bus in response to a fault current from said ring bus exceeding a predetermined threshold, wherein said at least one static switch is selectively switchable to selectively bypass said at least one choke to provide the fault current to said first fuse. ### Claim 4 (depends on 1) The UPS system in accordance with claim 1 further comprising a controller communicatively coupled to said at least one static switch, said controller operable to: monitor a current associated with said associated UPS; detect a fault condition has occurred at said associated UPS based at least partially on the monitored current; and control a first static switch of said at least one static switch to bypass a first choke of said plurality of chokes in response to the detected fault condition, said first static switch and said first choke associated with said associated UPS. ### Claim 5 (depends on 1) The UPS system in accordance with claim 1, wherein said plurality of UPSs are electrically coupled to a plurality of loads, each load of the plurality of loads coupled between two UPSs of said plurality of UPSs to receive redundant power. ### Claim 6 (depends on 1) The UPS system in accordance with claim 1, wherein each UPS of said plurality of UPSs shares electrical loads between the plurality of UPSs using frequency droop control through said ring bus. ### Claim 7 (depends on 1) The UPS system in accordance with claim 1, wherein said at least one static switch comprises a static switch module, wherein the static switch module comprises a plurality of static switching devices. ### Claim 8 (depends on 1) The UPS system in accordance with claim 1, wherein said at least one static switch comprises thyristors. ### Claim 9 (depends on 1) The UPS system in accordance with claim 1 further comprising a plurality of switchgears, each switchgear of said plurality of switchgears coupled between a respective UPS of said plurality UPSs, said ring bus, and at least one load, said plurality of switchgears comprising a plurality of circuit breakers and said plurality of chokes. ### Claim 10 (depends on 9) The UPS system in accordance with claim 9 further comprising a controller operable to identify a location of a fault condition and control at least one circuit breaker of said plurality of circuit breakers to selectively open to isolate the location of the fault condition. ### Claim 11 A power system comprising: a plurality of inverters that generate a power output; a plurality of chokes electrically coupling said plurality of inverters together; and a static switch coupled between an associated inverter of said plurality of inverters and other inverters of said plurality of inverters, said static switch switchable to selectively bypass at least one choke of said plurality of chokes. ### Claim 12 (depends on 12) The power system in accordance with claim 12 further comprising a plurality of uninterruptible power supplies (UPSs) including said plurality of inverters. ### Claim 13 (depends on 12) The power system in accordance with claim 12, further comprising a first fuse coupled to an associated inverter of said plurality of inventors, wherein said first fuse electrically disconnects said associated inverter from remaining inventors of said plurality of inverters in response to a fault current exceeding a predetermined threshold, wherein said static switch is selectively switchable to selectively bypass said at least one choke to provide the fault current to said first fuse. ### Claim 14 (depends on 12) The power system in accordance with claim 12, wherein said plurality of inverters are electrically coupled to a plurality of loads, each load of the plurality of loads coupled between two inverters of said plurality of inverters to receive redundant power. ### Claim 15 (depends on 12) The power system in accordance with claim 12, wherein said controller is operable to share electrical loads between said plurality of inverters by controlling a power output of each inverter of said plurality of inverters using frequency droop control. ### Claim 16 (depends on 12) The power system in accordance with claim 12, wherein said static switch comprises a thyristor. ### Claim 17 (depends on 12) The power system in accordance with claim 12 further comprising a controller communicatively coupled to said static switch, said controller operable to: monitor a current associated with said associated inverter; detect a fault condition has occurred at said associated inverter based at least partially on the monitored current; and control said static switch to bypass a first choke of said plurality of chokes in response to the detected fault condition, said first static switch and said first choke associated with said associated inverter. ### Claim 18 A method for providing an uninterruptible power supply (UPS), said method comprising: electrically coupling a plurality of UPSs together using a ring bus, wherein a choke is coupled between each UPS of the plurality of UPSs and the ring bus; coupling a static switch between an associated UPS of the plurality of UPSs and the ring bus, the static switch parallel to a respective choke; and selectively bypassing, with the static switch, the respective choke when a fault condition is detected at the associated UPS. ### Claim 19 (depends on 19) The method in accordance with claim 19, wherein selectively bypassing further comprises: monitoring, by a controller, a current associated with the associated UPS identifying the fault condition based at least partially on the monitored current; and closing, by the controller, the static switch to bypass the respective choke when the fault condition is identified. ### Claim 20 (depends on 19) The method in accordance with claim 19, wherein selectively bypassing further comprises: providing a fault current through the ring bus when the fault condition is detected, wherein the fault current bypasses the respective choke through the static switch; and electrically disconnecting the associated UPS from the ring bus by electrically disconnecting a fuse associated with the associated UPS using the fault current, wherein the fault current exceeds a predetermined threshold current of the fuse.