Abstract: Exemplary embodiments are directed to methods and systems for producing a three-phase current to a three-phase output. Switching converters are used to generate a positive current, a negative current, and an intermediate current. The system is configured such that the produced positive current follows a path of a highest phase of a sinusoidal three-phase signal at a given time, the produced negative current follows a path of a lowest phase of the three-phase signal at the given time, and the produced intermediate current follows a path of a phase of the three-phase signal between the highest and the lowest phase at the given time. The produced currents are switched to each phase conductor of the three-phase output in sequence so that phase currents of the three-phase current are formed in the output conductors.

Abstract: A cooling assembly is disclosed having a device chamber, a cooling chamber, a heat exchanger, a fan and a controller, the heat exchanger having a first heat exchanger unit and a second heat exchanger unit located above the first heat exchanger unit. The fan includes a first fan adapted to generate a first cooling air flow. The cooling assembly further includes a first dust tray located between the first heat exchanger unit and the second heat exchanger unit, the first cooling air flow being directed towards the first dust tray. The first dust tray is adapted to receive and retain at least part of contaminant particles present in the first cooling air flow, the device chamber being separated from the cooling chamber.

Abstract: An industrial robot is used to assemble a part to a predetermined location on a randomly moving workpiece. The workpiece may be an automobile on an assembly line and the part may be a wheel (a tire mounted on a rim) to be assembled on one of the wheel hubs of the automobile. The robot has mounted on it a camera, a force sensor and a gripper to grip the part. After the robot grips the part, signals from both the force sensor and vision are used by a computing device to move the robot to a position where the robot can assemble the part to the predetermined location on the workpiece. The computing device can be the robot controller or a separate device such as a PC that is connected to the controller.

Abstract: A network manager device in an industrial wireless network sends a network investigating message to other network nodes for processing and forwarding through the network, the message including a message weight. A wireless communication device providing a node in the network receives the message from another network node, determines a communication weight based on the quality of communication, adds the communication weight to the message weight and compares the sum with the node weight. If the sum is lower than the node weight, it is set as new node weight and as new message weight, whereupon the changed message is sent to other nodes in the network. The network manager device maps the topology of the network based on updated node weights, sets a communication scheduling scheme based on the mapped topology and informs the network nodes of the scheme.

Abstract: A method and system are provided for visualizing and displaying a state of a power transmission network to an operator, for the supervision of the network. The method and system are provided for visualizing or contouring a power transmission network state by displaying to an operator output data values interpolated at output data locations from input data including geographically distributed input data sensor locations and corresponding dynamically updated input data values. The method includes dividing a geographical area of interest into triangles, wherein a triangle vertex is defined at each input data location within the area, determining, for each triangle, closest input data locations according to a closeness criteria, and interpolating by weighting or scaling at each output data location within a triangle the input data values of a number of closest input data locations to generate output data values corresponding to the output data locations.

Abstract: An exemplary method and apparatus for detecting islanding conditions of a distributed grid are disclosed, wherein transfer of power through a power electrical unit is controlled on the basis of a control reference. The apparatus includes a first stage and a second stage performing a respective portion of the method. The first stage injects a reactive component to the control reference, and, for at least one electrical quantity of the grid, determines a change in the quantity induced by the injected component, and determines, on the basis of the change in the electrical quantity, whether to move to the second stage of the method.

Abstract: Exemplary embodiments are directed to an snubber circuit and a power converter having an active circuit. The snubber circuit includes a series connection of a first diode and a first inductor connected between a first interfacing point and a first connection point, a second diode connected between a second connection point and a second interfacing point, a series connection of a third diode and a second inductor between a third interfacing point and the second connection point, a switching device connected between the first connection point and the third interfacing point, and a first capacitor connected between the first connection point and the second connection point. The first, the second, and the third diode are forward-biased along a path between the first interfacing point and the second interfacing point and through the third interfacing point.

Abstract: A method for automatically controlling a flow in a flow line system including a flow line, a flow line inlet and outlet, and a control valve located in the flow line at the outlet. The method includes controlling the opening of the valve with a control unit. An outlet flow rate is measured or estimated from the flow line. The valve is opened. It is determined if a sudden drop occurs in any of the measurements or estimates. It is decided if a liquid blockage in the flow line is present or approaching. If a liquid blockage is indicated as present or approaching, the opening of the valve is increased by an amount determined by the measurements or estimates. Any further manipulation of the valve is inhibited before a non-zero time period has expired. The steps are repeated. Also a system and a computer program product.

Abstract: A method of allocating time slots for sensor node sample transmission from sensor nodes in a wireless sensor node network which forms part of a control system for controlling an industrial process includes receiving a sample from a first sensor node in a first time slot of a superframe, which first sample has a value outside an accepted range of values, obtaining an identification of a second time slot of the superframe in which second time slot the first sensor node is to send a further sample in a subsequent superframe, and providing instructions to the first sensor node to send the further sample in the second time slot of a subsequent superframe. A computer program product and a sensor node network interface system are also disclosed herein.

Abstract: A method for controlling a plurality of power converters connected to a power supply network is described. Each power converter includes high-power semiconductor devices. Control signals are sent between a controller and a wireless node of one or more of said plurality of power converters using a wireless communication system. The control signals are transmitted to a local wireless node of one or more of a plurality of power converters. The data transmissions include data packets including control information such that a clock of the local wireless node can be synchronized using time synchronization information of the wireless communication system. In other aspects of the invention a system employing the method and a computer program for carrying out the method are described.

Abstract: A transformer diagnosis apparatus and method which can advantageously be used for on-line diagnosis of a transformer, and by which transformer properties may be monitored and/or determined. The diagnosis method includes collecting, for at least two different transformer loads, measurements of a current being indicative of the transformer load, as well as measurements of at least one further transformer AC signal. The method further includes deriving, from the collected measurements, at least two values of a quantity which depends on a transformer property as well as on transformer load; and determining, from the derived values, a set of coefficient(s) of a relation for how the quantity is expected to vary with transformer load. The method further includes using the determined coefficient(s) in performing a diagnosis of the transformer.

Abstract: Redundant winding connections for multiphase electric machines are disclosed. According to one aspect, a multiphase machine having redundant winding connections includes: a first set of N coils operating as a first winding group, wherein each coil in the first winding group operates at a different phase from the other coils in the first winding group and wherein N is an integer greater than three; a second set of N coils separate from the first set and operating as a second winding group, wherein each coil in the second winding group operates at a different phase from the other coils in the second winding group and wherein the failure of one of the coils in the first winding group does not affect the function of the second winding group.

Abstract: A fiber-optic current sensor includes a measuring unit having a light source and a light detector, and a sensing head having a sensing fiber wound around a conductor and a retarder connected to the sensing fiber. The scale factor as a function of current of the fiber-optic current sensor is described by the product of two scaling functions fe? and fs? for the measuring unit and the sensing head, respectively. The data describing the scaling functions fe?, fs? is stored in a memory of the measuring unit, while the data describing the scaling function fs? is also stored in a memory of the sensing head. Providing two such memory devices allows to store the scaling functions fe? and fs? separately, thereby turning the control unit as well as the sensor head into easily replaceable modules.

Abstract: A cooled electrical assembly is disclosed which includes a plurality of cooled components and a first cooling fan adapted to provide a cooling flow for cooling the cooled components, the first cooling fan including a blade holder and a fan blade, the fan blade having a fixed end stationary mounted to the blade holder and a free end adapted to swing for generating the cooling flow. The plurality of cooled components can include four substantially cylindrical components each having a centre axis, the four substantially cylindrical components being spaced apart and located such that the centre axis of each said substantially cylindrical component passes through a respective vertex of a quadrilateral, the free end of the fan blade being located between the four substantially cylindrical components and inside the quadrilateral.

Abstract: An apparatus for use in an electrical power generation plant. The apparatus includes: at least two adjustable speed drives, each connected, on an alternating current side, to an associated auxiliary motor; at least one reactive power consuming auxiliary device connected to an alternating current bus; a controller; a converter for converting alternating current to direct current or vice versa between the alternating current bus and a direct current bus; and at least one electrical power source arranged to provide power to the direct current bus. Each of the at least two adjustable speed drive is connected, on a direct current side, to the direct current bus.

Abstract: A framework, device and method are disclosed for providing broadcast communication security over Ethernet within an automation system, wherein a security plug provides secure working of the automation system. The security plug can be implemented using ASIC/FPGA technology to provide compatibility with existing systems and an intuitive plug-and-play model. An exemplary system can address jitter-sensitivity by providing a real-time architecture, with minimal transmission latencies. The security plug can have separate security and communication modules that make provisions for protocol independent working of the security plug, within these networks. The method can include bootstrapping, secret key establishment and secure communication, for providing real-time guarantees.

Abstract: A method, safety route guiding device and a computer program product enables users in the premises of an industrial plant to reach safety in case of an emergency, where said users are equipped with mobile terminals, where the safety route guiding device includes a guiding unit that receives alarm data concerning an emergency in a clearance zone of the premises, the alarm data being relevant for a user of a mobile terminal, obtains data of a set of other users affected by the emergency, guides the user from the clearance zone to a security zone outside the premises, obtains status data concerning the other users in the set, and presents the status data to the user via the mobile terminal.

Abstract: A power generation system includes at least one generator having at least two sets of stator windings, an active rectifier comprising power cell based modular converters associated with each set of generator windings. Each set of windings is connected to an AC voltage side of the associated active rectifier, with each active rectifier having a positive DC voltage output and a negative DC voltage output. The DC voltage outputs of active rectifiers are connected to each other in series. A medium voltage DC (MVDC) collection network comprises positive pole cables and negative pole cables, wherein each positive pole cable is connected to the positive DC voltage output of a first active rectifier and each negative pole cable is connected to the negative DC voltage output of a last active rectifier. A substation receives the negative and positive pole cables of the MVDC collection network for further transformation and transmission.

Abstract: A voltage sensor includes an insulator with mutually insulated electrodes embedded therein. The electrodes are coaxial and cylindrical and overlap axially along part of their lengths. They are mutually staggered and control the surfaces of electric equipotential such that there is a substantially homogeneous electric field outside the insulator and a substantially homogeneous but higher field within a sensing cavity within the insulator. A field sensor is arranged within the sensing cavity to measure the field. This design allows for the production of compact voltage sensors for high voltage applications.

Abstract: A power electronics module for enhancing short circuit failure mode (SCFM) transitions. The module is adapted to disconnect a gate unit from the module using a first switch, upon a failure of at least one of a plurality of semiconductor chips during which the failed chip enters an SCFM, and connect a passive circuit arrangement, including at least one capacitor and at least one resistor, to the module using a second switch. The passive circuit arrangement is adapted to switch on at least one of the remaining non-failed semiconductor chips.