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.

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.

Abstract: An uninterruptible power supply (UPS) system is provided. The UPS system includes a plurality of UPSs, a ring bus that electrically couples the UPSs together, a static switch coupled between an associated UPS of the UPSs and the ring bus, and a controller. The controller receives current data representative of an inverter current and a load current associated with the associated UPS. An output capacitor of the associated UPS is coupled to a node that conducts the inverter current and the load current. The controller further calculates a measured current based on the received current data, determines a voltage of said output capacitor, generates a derived current based on the determined voltage and a predetermined capacitance of said output capacitor, compares the measured current and the derived current to identify a fault location, and controls said static switch based on the identified fault location.

Abstract: A power conversion system is provided. The power conversion system includes a plurality of power conversion modules connected in parallel, all power conversion modules of the plurality of power conversion modules configured to receive a pulse-width modulation control signal, each power conversion module of the plurality of power conversion modules including a current unbalance detection circuit configured to calculate a difference between a reference current and an output current of the power conversion module, and a processing device communicatively coupled to the current unbalance detection circuit and configured to perform processing using the calculated difference.

Abstract: An uninterruptible power supply (UPS) system includes an inverter feed path and a plurality of bypass feed paths configured to couple to an AC voltage source such that each bypass feed path includes a switch configured to couple the AC voltage source to the load when closed. The switch in each bypass feed path may be rated to conduct current that corresponds to an output of the inverter feed path. Each bypass feed path may be coupled in parallel with each other and the inverter feed path. The UPS system may also include at least one controller coupled to a respective inverter and to a respective rectifier in the inverter feed path and a plurality of controllers. Each controller may be coupled to a respective switch such that the at least one controller and the plurality of controllers communicate with each other via at least two communication buses.

Abstract: Systems and methods are provided to control a multimode uninterruptible power supply (UPS) using external information relevant to the stability of the power source. In one example, a UPS system may include at least one inverter feed path and at least one bypass feed path. A controller may command the inverter feed path and the bypass feed path based at least in part on information relevant to the stability of the power source that supplies the first inverter feed path or the first bypass feed path, or both. This information relevant to the stability of the power source may derive from at least one information provider external to the UPS system.

Abstract: A system may include an uninterruptible power supply (UPS) configured to provide power to a load via a bypass feed path coupled to a first power source or via an inverter feed path coupled to a second power source. The UPS may include a controller configured to switch between providing power to the load via the bypass feed path and the inverter feed path based at least in part on a real-time calculation of an amount of voltage distortion present on a voltage signal input to the load via the bypass path. As such, the controller may be configured to provide power to the load via the inverter feed path when the amount of voltage distortion is greater than a limit.

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 the plurality of chokes electrically coupling an associated UPS of the plurality of UPSs to the ring bus, and at least one switch electrically coupled between at least one UPS of the plurality of UPSs and the ring bus, the at least one switch having an opening time of less than 10 milliseconds.

Abstract: A power conversion system is provided. The power conversion system includes a plurality of power conversion modules connected in parallel, all power conversion modules of the plurality of power conversion modules configured to receive a pulse-width modulation control signal, each power conversion module of the plurality of power conversion modules including a current unbalance detection circuit configured to calculate a difference between a reference current and an output current of the power conversion module, and a processing device communicatively coupled to the current unbalance detection circuit and configured to perform processing using the calculated difference.

Abstract: An uninterruptible power supply (UPS) is provided that includes a split direct current (DC) link having a first capacitor coupled between a positive DC link terminal and a first node, and a second capacitor coupled between the first node and a negative DC link terminal. The UPS also includes a rectifier coupled to an input of the split DC link and a controller coupled to the rectifier. The rectifier includes first, second, and third legs, wherein each leg is configured to convert a first alternating current (AC) voltage received from an AC source into a DC voltage to be provided to the split DC link, and a fourth leg configured to balance DC link voltages of the first and second capacitors. The controller is configured to maintain functionality of the rectifier during at least one of a partial utility power outage, a full utility outage, and a failure of at least one of the first, second, third, and fourth legs.

Abstract: Systems, methods, and devices for controlling parallel uninterruptible power supplies (UPSs) are provided. One example of a parallel UPS system may include several UPS modules to supply power to a load and at least one controller. At least some of the UPS modules may include a bypass feed path that can be switched on or off via a static switch module (SSM). The controller may adaptively control which of the bypass feed paths are switched on and off based on the load and respective capacity ratings of the UPS modules. The controller may also determine when an SSM of one of the bypass feed paths is likely to have failed.

Abstract: Systems and methods for controlling uninterruptible power supplies (UPSs) are provided. In one example, a system may include an inverter feed path to supply a first amount of power to a load and a bypass feed path to supply a second amount of power to the load. A controller may generate command the inverter feed path and the bypass feed path to vary the first amount of power and the second amount of power based at least in part on an occurrence of a power supply disturbance and a type or severity, or both, of the power supply disturbance.

Abstract: Systems, methods, and devices are provided for redundant control of parallel inverter installations. In one example, a parallel uninterruptible power supply (UPS) system may include several inverter feed paths and several UPS controllers. The inverter feed paths may supply double-conversion power to a load. The UPS controllers may be communicatively coupled to one another via at least two redundant data busses. The UPS controllers may operate in conjunction with one another to control the plurality of feed paths.

Abstract: A multi-mode uninterruptible power supply (UPS) is provided. The multi-mode UPS includes a first path including a rectifier and an inverter, and a second path in parallel with the first path, wherein the multi-mode UPS is operable in an economy mode in which power flows from a utility to a load through the second path while at least one of the rectifier and the inverter is activated, the at least one of the rectifier and the inverter operable to perform at least one of DC voltage regulation, reactive power compensation, and active damping.

Abstract: An uninterruptible power supply (UPS) system includes an inverter feed path and a plurality of bypass feed paths configured to couple to an AC voltage source such that each bypass feed path includes a switch configured to couple the AC voltage source to the load when closed. The switch in each bypass feed path may be rated to conduct current that corresponds to an output of the inverter feed path. Each bypass feed path may be coupled in parallel with each other and the inverter feed path. The UPS system may also include at least one controller coupled to a respective inverter and to a respective rectifier in the inverter feed path and a plurality of controllers. Each controller may be coupled to a respective switch such that the at least one controller and the plurality of controllers communicate with each other via at least two communication buses.

Abstract: A system may include an uninterruptible power supply (UPS) configured to provide power to a load via a bypass feed path coupled to a first power source or via an inverter feed path coupled to a second power source. The UPS may include a controller configured to switch between providing power to the load via the bypass feed path and the inverter feed path based at least in part on a real-time calculation of an amount of voltage distortion present on a voltage signal input to the load via the bypass path. As such, the controller may be configured to provide power to the load via the inverter feed path when the amount of voltage distortion is greater than a limit.

Abstract: Systems, methods, and devices for controlling parallel uninterruptible power supplies (UPSs) are provided. One example of a parallel UPS system may include several UPS modules to supply power to a load and at least one controller. At least some of the UPS modules may include a bypass feed path that can be switched on or off via a static switch module (SSM). The controller may adaptively control which of the bypass feed paths are switched on and off based on the load and respective capacity ratings of the UPS modules. The controller may also determine when an SSM of one of the bypass feed paths is likely to have failed.

Abstract: Systems and methods are provided to control a multimode uninterruptible power supply (UPS) using external information relevant to the stability of the power source. In one example, a UPS system may include at least one inverter feed path and at least one bypass feed path. A controller may command the inverter feed path and the bypass feed path based at least in part on information relevant to the stability of the power source that supplies the first inverter feed path or the first bypass feed path, or both. This information relevant to the stability of the power source may derive from at least one information provider external to the UPS system.

Abstract: Systems and methods for controlling uninterruptible power supplies (UPSs) are provided. In one example, a system may include an inverter feed path to supply a first amount of power to a load and a bypass feed path to supply a second amount of power to the load. A controller may generate command the inverter feed path and the bypass feed path to vary the first amount of power and the second amount of power based at least in part on an occurrence of a power supply disturbance and a type or severity, or both, of the power supply disturbance.

Abstract: Systems, methods, and devices are provided for redundant control of parallel inverter installations. In one example, a parallel uninterruptible power supply (UPS) system may include several inverter feed paths and several UPS controllers. The inverter feed paths may supply double-conversion power to a load. The UPS controllers may be communicatively coupled to one another via at least two redundant data busses. The UPS controllers may operate in conjunction with one another to control the plurality of feed paths.