METHOD AND ARRANGEMENT TO DETERMINE THE CELL CAPACITOR VOLTAGE OF A CELL OF A MULTI-CELL POWER CONVERTER

    公开(公告)号:CA2759818C

    公开(公告)日:2016-11-01

    申请号:CA2759818

    申请日:2009-05-07

    Abstract: An arrangement to determine a cell capacitor voltage value (U dc) of a cell (10") of a multi-cell power converter comprises the cell (10") and a control unit (28). The cell (10") itself comprises four power electronic valves (1-4) interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg comprises a series-connection of two (1, 3; 2, 4) of the four power electronic valves and where the connection point (6; 7) between the two power electronic valves of each phase leg is externally connectable, a cell capacitor (5) being connected in parallel to the first and the second phase legs, and four gate units (16-19), each being connected to a corresponding one of the power electronic valves (1-4) as well as to the control unit (28). Each of the four gate units (16-19) comprises a voltage measurement unit (24-27) adapted to take a continuous voltage measurement across the corresponding power electronic valve, and each of the four gate units (16-19) is adapted to transmit its continuous voltage measurement. The control unit (28) is adapted to receive from each of the four gate units (16-19) its continuous voltage measurement and to determine the cell capacitor voltage value (U dc) based on at least one of these voltage measurements.

    A HIGH VOLTAGE DC POWER SOURCE AND A POWER APPARATUS FOR A HIGH VOLTAGE ELECTRICAL POWER SYSTEM

    公开(公告)号:CA2824895C

    公开(公告)日:2016-03-01

    申请号:CA2824895

    申请日:2011-01-18

    Abstract: A high voltage dc power source is provided for providing a charging current to an electronic device, comprising one or more strings connected in parallel, each string being subdivided into a plurality of dc power source units connected in series and each string being provided with at least one solid-state switch configured to connect and disconnect said string, and a control unit adapted to turn on and turn off the at least one solid-state switch, and the control unit is configured, upon receiving an order to connect the string, to control the at least one switch of the string to be alternately turned on and off so that a soft charging of the electronic device is achieved.

    A VOLTAGE SOURCE CONVERTER AND A METHOD FOR FAULT HANDLING THEREOF

    公开(公告)号:CA2793475C

    公开(公告)日:2015-11-24

    申请号:CA2793475

    申请日:2010-03-23

    Abstract: A voltage source converter (22) having a plurality of cell modules (15, 31) connected in series, each cell module (15, 31) comprising a converter unit (6a, 6b) having an ac-side (Uac) and a dc-side (Udc), and the voltage source converter comprises a control unit (33, 70) adapted to control the converter units, where at least one of the cell modules (15) comprises a second redundant converter unit (6a, 6b) having an ac-side which is connected in parallel with the ac-side of the first converter unit and the control unit is configured to substantially synchronously control the first and the second converter units.

    METHOD AND ARRANGEMENT TO DETERMINE THE CELL CAPACITOR VOLTAGE OF A CELL OF A MULTI-CELL POWER CONVERTER

    公开(公告)号:CA2759818A1

    公开(公告)日:2010-11-11

    申请号:CA2759818

    申请日:2009-05-07

    Abstract: An arrangement to determine a cell capacitor voltage value (Udc) of a cell (10") of a multi-cell power converter comprises the cell (10") and a control unit (28). The cell (10") itself comprises four power electronic valves (1-4) interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg comprises a series-connection of two (1, 3; 2, 4) of the four power electronic valves and where the connection point (6; 7) between the two power electronic valves of each phase leg is externally connectable, a cell capacitor (5) being connected in parallel to the first and the second phase legs, and four gate units (16-19), each being connected to a corresponding one of the power electronic valves (1-4) as well as to the control unit (28). Each of the four gate units (16-19) comprises a voltage measurement unit (24-27) adapted to take a continuous voltage measurement across the corresponding power electronic valve, and each of the four gate units (16-19) is adapted to transmit its continuous voltage measurement. The control unit (28) is adapted to receive from each of the four gate units (16-19) its continuous voltage measurement and to determine the cell capacitor voltage value (Udc) based on at least one of these voltage measurements.

    AN ARRANGEMENT FOR EXCHANGING POWER

    公开(公告)号:CA2757749A1

    公开(公告)日:2010-10-14

    申请号:CA2757749

    申请日:2009-04-09

    Abstract: An arrangement for exchanging power, in shunt connection, with a three-phase electric power network (2) comprises on one hand for each said phase a reactive impedance element (31, 41, 51) and a Voltage Source Converter (32, 42, 52) connected in series with said element, and on the other a control unit (25) 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 Sou rce Converter comprises a series connection of switching cells in the form of so-called H-bridges comprisi ng two switch ing 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.

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