ABB Ltd

About: ABB Ltd is a company organization based out in Zurich, Switzerland. It is known for research contribution in the topics: Voltage & Signal. The organization has 6222 authors who have published 6852 publications receiving 83994 citations.

Method of producing a noncircular cooling bore

Abstract: In a method of forming a cooling bore in a wall of a workpiece, the configuration of a feed section and a diffuser section is selected, a throughbore is produced with a cross-sectional area within the cross-sectional area of the feed section, and the diffuser section is cut out by a beam- or jet-drilling method in such a way that the drilling beam or jet in the region of the feed section remains essentially within the cross-sectional area of the latter.

Distributed virtual inertia based control of multiple photovoltaic systems in autonomous microgrid

Abstract: The large inertia of a traditional power system slows down system U+02BC s frequency response but also allows decent time for controlling the system. Since an autonomous renewable microgrid usually has much smaller inertia, the control system must be very fast and accurate to fight against the small inertia and uncertainties. To reduce the demanding requirements on control, this paper proposes to increase the inertia of photovoltaic U+0028 PV U+0029 system through inertia emulation. The inertia emulation is realized by controlling the charging U+002F discharging of the direct current U+0028 DC U+0029-link capacitor over a certain range and adjusting the PV generation when it is feasible and U+002F or necessary. By well designing the inertia, the DC-link capacitor parameters and the control range, the negative impact of inertia emulation on energy efficiency can be reduced. The proposed algorithm can be integrated with distributed generation setting algorithms to improve dynamic performance and lower implementation requirements. Simulation studies demonstrate the effectiveness of the proposed solution.

Arrangement of fuel cells based on a high-temperature solid electrolyte of stabilized zirconium oxide for achieving maximum possible power

Abstract: Arrangement of fuel cells based on a high-temperature solid electrolyte (1) of stabilized ZrO 2 for achieving maximum possible power in minimum space by electrical series connection and mechanical stacking of a plurality of flat, plane plate-shaped fuel cells (1; 2; 3) on the filter press principle, in each case the oxygen electrode (2) of the one fuel cell being connected to the fuel electrode (3) of the next-following fuel cell by an electrically conductive element (4), which contains flow channels for the gaseous media. Design of the electrically conductive elements as a bipolar plate (4) provided with elevations (11). Cross-flow principle. Chequerboard-like arrangement of a plurality of fuel cell stacks (33) next to one another: best utilization of space, maximum power density.

Gate driver unit for electrical switching device

Abstract: An exemplary apparatus and method for using intelligent gate driver units with distributed intelligence to control antiparallel power modules or parallel-connected electrical switching devices like IGBTs is disclosed. The intelligent gate drive units use the intelligence to balance the currents of the switching devices, even in dynamic switching events. The intelligent gate driver units can use master-slave or daisy chain control structures and instantaneous or time integral differences of the currents of parallel-connected switching devices as control parameters. Instead of balancing the currents, temperature can also be balanced with the intelligent gate driver units.

Microgrid energy management system and method for controlling operation of a microgrid

Abstract: A microgrid includes a plurality of distributed energy resources such as controllable distributed electric generators (104, 106, 108, 110, 112) and electrical energy storage devices (114). A method of controlling operation of the microgrid includes periodically updating a distributed energy resource schedule for the microgrid that includes on/off status of the controllable distributed electric generators (104, 106, 108, 110, 112) and charging/discharging status and rate of the electrical energy storage devices (114) and which satisfies a first control objective for a defined time window, based at least in part on a renewable energy generation and load forecast for the microgrid (200). The method further includes periodically determining power set points for the controllable distributed energy resources (104, 106, 108, 110, 112) which satisfy a second control objective for a present time interval within the defined time window, the second control objective being a function of at least the distributed energy resource schedule for the microgrid (210).