Abstract: A user terminal (100, 200, 300, 400), a UE, for a wireless communications system. The UE comprises an antenna unit (130) and a receiver unit (125) for receiving signals on a radio channel within the system. The UE also comprises a sensor (115) for sensing the position of the UE and for generating an output signal indicative of said position. The UE further comprises an evaluation unit (120) which is arranged to measure the UE's communication performance over the channel and to also receive the output signal from the sensor and to generate a first control signal (S1) which indicates if altering the position of at least part of the UE, and thereby the position of the UE's antenna unit (130), will result in an increased communication performance over the channel for the UE.

Abstract: The present invention relates to an HVDC switchyard arranged to interconnect a first part of a DC grid with a second part of the DC grid. By means of the invention, a first part of the DC grid is connected to the busbars of the HVDC switchyard via a fast DC breaker, while further part(s) of the DC grid are connected to the busbars of the HVDC switchyard by means of switchyard DC breakers of lower breaking speed. By use of the inventive HVDC switchyard arrangement, the cost for the HVDC switchyard can be considerably reduced, while adequate protection can be provided. In one embodiment, the fast DC breaker is an HVDC station DC breaker forming part of an HVDC station. In another embodiment, the fast DC breaker is a switchyard DC breaker.

Abstract: A method for providing a switching order signal to a cell of a cascaded two-level converter is provided. The cell includes a capacitor parallel-connected with two series-connected semiconductor devices. The cascaded two-level converter includes two or more of the cells cascade connected and arranged in a phase, divided into two phase arms, between a first pole and a second pole of a direct voltage side. The method includes measuring voltages of the capacitor of the cell; calculating a compensated voltage reference based on a voltage reference and the measured voltages of the capacitors, wherein the voltage reference corresponds to a desired ac current to be output on an ac-side; using the compensated voltage reference to calculate a switching order signal, and providing the switching order signal to the cells.

Abstract: A cascaded electric power converter and a method of operating a cascaded electric power converter are disclosed. The cascaded converter includes: a converter cell including a cell capacitor and at least one phase leg having at least two electric valves, the at least one phase leg being connected in parallel to the cell capacitor; and a control system for controlling the switching of the electric valves of the at least one phase leg. The control system is configured to, upon detection of a need to by-pass the converter cell, control the switching of the electric valves in a manner so that the cell capacitor is short circuited via a phase leg, so as to obtain a current surge through the phase leg, thereby creating a permanent current path through the converter cell.

Abstract: A user terminal (100, 200, 300, 400), a UE, for a wireless communications system. The UE comprises an antenna unit (130) and a receiver unit (125) for receiving signals on a radio channel within the system. The UE also comprises a sensor (115) for sensing the position of the UE and for generating an output signal indicative of said position. The UE further comprises an evaluation unit (120) which is arranged to measure the UE's communication performance over the channel and to also receive the output signal from the sensor and to generate a first control signal (S1) which indicates if altering the position of at least part of the UE, and thereby the position of the UE's antenna unit (130), will result in an increased communication performance over the channel for the UE.

Abstract: In a method of link quality control for communication links between a plurality of mobile terminals and a node in a radio communication system, providing (S0) at least one data block for transmission between said node and at least one of said mobile terminals, providing (S1) at least two measurement reports comprising measurements of the quality for a plurality of potential burst constellations on which to transmit said at least one data block, jointly selecting (S2) a respective burst constellation for each said at least one data block based at least on said measurement reports, jointly selecting (S3) a respective modulation and coding scheme for each said data block based at least on said measurement reports. Subsequently, scheduling (S4) bursts for transmission on at least one available channel based at least on said jointly selected modulation and coding scheme and said jointly selected burst constellation.

Abstract: An arrangement to determine a cell capacitor voltage value of a cell of a multi-cell power converter includes the cell and a control unit. The cell itself includes four power electronic valves interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg includes a series-connection of two of the four power electronic valves and where the connection point between the two power electronic valves of each phase leg is externally connectable, a cell capacitor being connected in parallel to the first and the second phase legs, and four gate units, each being connected to a corresponding one of the power electronic valves as well as to the control unit.

Abstract: Multi-terminal HVDC systems and control methods therefore are disclosed. Methods for controlling multi-terminal HVDC systems having a plurality of converter stations may include receiving a plurality of measurements from a plurality of measurement units disposed on the HVDC system, identifying from the measurements a disruption within the HVDC system, monitoring the measurements to identify a steady-state disrupted condition for the HVDC system, calculating a new set point for at least one of the plurality of converter stations, which new set point may be based on the steady-state disrupted condition and the measurements, and transmitting the new set point to the at least one of the plurality of converter stations. In some examples, the HVDC systems may include an HVDC grid interconnecting the plurality of converter stations and a controller communicatively linked to the plurality of measurement units and the plurality of converter stations.

Abstract: Power exchanging arrangement, in shunt connection, with a three-phase electric power network including on one hand for each said phase a reactive impedance element and a Voltage Source Converter connected in series with said element, and on the other hand a control unit configured to control semiconductor devices of turn-off type of said converter for generating a voltage with a fundamental frequency being equal to the fundamental frequency of the voltage of the respective said phase and by that control a flow of reactive power between said arrangement and the respective phase of said electric power network. Each Voltage Source Converter includes a series connection of switching cells in the form of so-called H-bridges including two switching elements connected in parallel and each having at least two semiconductor assemblies connected in series. Each switching cell further comprises at least one energy storing capacitor connected in parallel with said switching elements.

Abstract: Voltage source converter based on a chain-link cell topology including one or more phases, each of the phases having one or more series-connected chain-link cell modules connected to each other. The output voltage of the voltage source converter is controlled by control signals applied to the series-connected chain-link cell modules. In case of failure of a chain-link cell module, that module is controlled, by the control signals, such that zero output voltage is provided at its output voltage AC terminal.

Abstract: An arrangement to determine a cell capacitor voltage value of a cell of a multi-cell power converter includes the cell and a control unit. The cell itself includes four power electronic valves interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg includes a series-connection of two of the four power electronic valves and where the connection point between the two power electronic valves of each phase leg is externally connectable, a cell capacitor being connected in parallel to the first and the second phase legs, and four gate units, each being connected to a corresponding one of the power electronic valves as well as to the control unit.

Abstract: The present invention provides a quality based resource management in a radio communications system. In this resource management, channel resources are dynamically allocated to a multiresource capable mobile unit based on a radio quality of a radio link between the mobile unit and an associated base station. Thus, the amount of these resources to be allocated to the mobile unit is determined based on this radio quality and can be dynamically updated based on new quality reports. A high experienced quality means that more resources are allocated. The quality based resource allocation can also be combined with a quality based transmission scheduling. In such a case, mobile units experiencing a high quality are allowed to transmit more often in a period of time than mobile units with low quality.

Abstract: The invention involves uplink access management for user terminals (210, 220, 230, 240, 250, 260, 270) present in a same first cell (15) of a communication system (1) and participating in a communication session involving communication of user data on a common downlink channel to the terminals (210, 220, 230, 240, 250, 260, 270). When the terminals (210, 220, 230, 240, 250, 260, 270) want to respond to the user data transmission, they first have to request uplink access. According to the invention, at least one of the terminals (220, 230, 240) requests this uplink access using a request channel associated with a second (25, 35, 45) cell different from the current first cell (15). This reduces the risk of collision of uplink access requests on the request channel by distributing the requests over several cells (15, 25, 35, 45) instead of a single cell (15).

Abstract: A thyristor controlled series capacitor module including a capacitor connectable in series with a power line, a thyristor valve connected in parallel with the capacitor, a breaker connected in parallel with the thyristor valve, and an inductor. By providing a simplified breaker arrangement, the number of components is reduced.

Abstract: A method for providing a switching order signal to a cell of a cascaded two-level converter is provided. The cell includes a capacitor parallel-connected with two series-connected semiconductor devices. The cascaded two-level converter includes two or more of the cells cascade connected and arranged in a phase, divided into two phase arms, between a first pole and a second pole of a direct voltage side. The method includes measuring voltages of the capacitor of the cell; calculating a compensated voltage reference based on a voltage reference and the measured voltages of the capacitors, wherein the voltage reference corresponds to a desired ac current to be output on an ac-side; using the compensated voltage reference to calculate a switching order signal, and providing the switching order signal to the cells.

Abstract: The present invention relates to a method of reducing setup delay for an uplink message from a user terminal (UT) in a delay sensitive service in a radio telecommunications system, such as a push to talk service (PoC), by predicting that delay sensitive data is about to be transmitted, sending, as a response to the prediction, a connection setup signal from the terminal to a basestation subsystem (BSS) in order to set up an early uplink radio connection, and transmitting the delay sensitive data via the early uplink connection. There is also provided a user terminal (UT) and a radio telecommunications system.

Abstract: The invention involves uplink access management for user terminals (210, 220, 230, 240, 250, 260, 270) present in a same first cell (15) of a communication system (1) and participating in a communication session involving communication of user data on a common downlink channel to the terminals (210, 220, 230, 240, 250, 260, 270). When the terminals (210, 220, 230, 240, 250, 260, 270) want to respond to the user data transmission, they first have to request uplink access. According to the invention, at least one of the terminals (220, 230, 240) requests this uplink access using a request channel associated with a second (25, 35, 45) cell different from the current first cell (15). This reduces the risk of collision of uplink access requests on the request channel by distributing the requests over several cells (15, 25, 35, 45) instead of a single cell (15).

Abstract: The present invention provides a quality based resource management fin a radio communications system. In this resource management, channel resources are dynamically allocated to a multi-resource capable mobile unit based on a radio quality of a radio link between the mobile unit and an associated base station. Thus, the amount of these resources to be allocated to the mobile unit is determined based on this radio quality and can be dynamically updated based on new quality reports. A high experienced quality means that more resources are allocated. The quality based resource allocation can also be combined with a quality based transmission scheduling. In such a case, mobile units experiencing a high quality are allowed to transmit more often in a period of time than mobile units with low quality.

Abstract: An induction device having windings of different phases arranged around magnetic core limbs. The magnetic core limbs are connected by at least one body formed from magnetic particles in a matrix of a dielectric material.

Abstract: In a method of link quality control for communication links between a plurality of mobile terminals and a node in a radio communication system, providing (S0) at least one data block for transmission between said node and at least one of said mobile terminals, providing (S1) at least two measurement reports comprising measurements of the quality for a plurality of potential burst constellations on which to transmit said at least one data block, jointly selecting (S2) a respective burst constellation for each said at least one data block based at least on said measurement reports, jointly selecting (S3) a respective modulation and coding scheme for each said data block based at least on said measurement reports. Subsequently, scheduling (S4) bursts for transmission on at least one available channel based at least on said jointly selected modulation and coding scheme and said jointly selected burst constellation.