Method And Arrangement To Determine The Cell Capacitor Voltage Of A Cell Of A Multi-Cell Power Converter
First Claim
1. A method to determine a cell capacitor voltage value of a cell of a multi-cell power converter, where the cell comprisesfour power electronic valves interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg comprises 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, andfour gate units, each being connected to a corresponding one of the power electronic valves,characterized in thatacross each of the power electronic valves a continuous voltage measurement is taken by the corresponding gate unit, andthe cell capacitor voltage value is determined based on at least one of the continuous voltage measurements.
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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.
9 Citations
16 Claims
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1. A method to determine a cell capacitor voltage value of a cell of a multi-cell power converter, where the cell comprises
four power electronic valves interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg comprises 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, characterized in that across each of the power electronic valves a continuous voltage measurement is taken by the corresponding gate unit, and the cell capacitor voltage value is determined based on at least one of the continuous voltage measurements.
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12. An arrangement to determine a cell capacitor voltage value of a cell of a multi-cell power converter, where the arrangement comprises the cell and a control unit, the cell comprising
four power electronic valves interconnected as a full-bridge converter having a first and a second phase leg, where each phase leg comprises 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, characterized in that each of the four gate units comprises a voltage measurement unit adapted to take a continuous voltage measurement across the corresponding power electronic valve, each of the four gate units is adapted to transmit its continuous voltage measurement, and the control unit is adapted to receive from each of the four gate units its continuous voltage measurement and to determine the cell capacitor voltage value based on at least one of these voltage measurements.
Specification