Abstract:
A switching module (38), intended to be used in a medium or high voltage DC breaker or a DC current limiter, comprises at least one power semiconductor switching element (1, 2), a gate unit (31 ) arranged to turn the at least one power semiconductor switching element on and off, respectively, according to a switching control signal, and an energy storage capacitor (25) arranged to provide power to a power supply input (29) of the gate unit. The switching module comprises further power transformation means (20) arranged to receive an optical power signal, to transform the optical power signal into an electrical power signal and to provide the electrical power signal to the energy storage capacitor (25).
Abstract:
601067 Disclosed is a device to limit and/or break an electrical current flowing through a power transmission or distribution line. The device includes at least one switching module (38a) comprised of at least one power semiconductor switching element (1), a gate unit (31), an energy storage capacitor (25) and a power transformation unit (20). The gate unit (31) is arranged to turn the at least one power semiconductor switching element (1) on and off according to a switching control signal. The energy storage capacitor (25) is arranged to provide power to a power supply input of the gate unit (31). The power transformation unit (20) is arranged to receive an optical power signal and to transform the optical power signal into an electrical power signal and to provide the electrical power signal to the energy storage capacitor (25). The switching module (38a) is arranged to separate from the optical power signal an electrical control signal and to provide the electrical control signal to the gate unit (31), wherein the electrical control signal comprises the switching control signal.
Abstract:
Un arreglo para intercambiar energía, en conexión de derivación, con una red de energía eléctrica trifásica (2) comprende, por una parte, para cada una de dichas fases un elemento de impedancia reactiva (31, 41, 51) y un Convertidor de Fuente de Voltaje (32, 42, 52) conectado en serie con dicho elemento y, por otra parte, una unidad de control (25) configurada para controlar dispositivos de semiconductor de tipo apagado de dicho convertidor para generar un voltaje con una frecuencia fundamental que es igual a la frecuencia fundamental del voltaje de dicha fase respectiva y, a través de eso, controlar un flujo de energía reactiva entre dicho arreglo y la fase respectiva de dicha red de energía eléctrica; cada Convertidor de Fuente de Voltaje comprende una conexión en serie de celdas de conmutación en la forma de los denominados puentes H que comprenden dos elementos de conmutación conectados en paralelo y cada uno tiene al menos dos ensambles de semiconductor conectados en serie; cada celda de conmutación además comprende al menos un condensador de almacenamiento de energía conectado en paralelo con dichos elementos de conmutación.
Abstract:
A switching module (38), intended to be used in a medium or high voltage DC breaker or a DC current limiter, comprises at least one power semiconductor switching element (1, 2), a gate unit (31 ) arranged to turn the at least one power semiconductor switching element on and off, respectively, according to a switching control signal, and an energy storage capacitor (25) arranged to provide power to a power supply input (29) of the gate unit. The switching module comprises further power transformation means (20) arranged to receive an optical power signal, to transform the optical power signal into an electrical power signal and to provide the electrical power signal to the energy storage capacitor (25).
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.
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.
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.
Abstract:
Voltage source converter based on a chain-link cell topology, said converter comprising one or more phases (L1, L2, L3), each of said phases comprising one or more series- connected chain- link cell modules connected to each other, an output voltage of said voltage source converter is controlled by control signals applied to said cell modules. In case of failure of a chain- link cell module that module is controlled, by said control signals, such that zero output voltage is provided at its output voltage AC terminal.