Abstract:
A model-based method of estimating physical parameters of a LCL filter connected between a converter and electrical power network and a converter. The method comprising forming an analytical discrete-time model of the LCL filter and the converter, forming a discrete-time pulse-transfer function of the analytical discrete-time model having discrete time parameters, injecting a voltage signal superimposed on the reference voltage to the converter, determining output current of the converter, based on the injected voltage signal and output current of the converter, estimating the discrete-time parameters, and based on the estimated discrete-time parameters solving the estimated physical parameters using the analytical discrete-time model.
Abstract:
A method of producing a power electronic assembly and a power electronic assembly comprising a power electronic module incorporating multiple of semiconductor power electronic switch components, the power electronic module comprising a bottom surface, the power electronic assembly comprises further a cooling arrangement for cooling the power electronic module, the cooling arrangement comprising a cooling surface adapted to be attached against the bottom surface of the power electronic module, wherein the power electronic assembly comprises further a thermal interface material arranged between the bottom surface of the power electronic module and the cooling surface of the cooling arrangement to transfer heat from the power electronic module to the cooling arrangement, the thermal interface material comprises an aluminium foil having a polymer coating.
Abstract:
A power electronic assembly and a method of producing a power electronic assembly. The assembly comprising a power electronic module having multiple of semiconductor power electronic switch components, the power electronic module comprising a base plate, the power electronic assembly comprising further a cooling arrangement for cooling the power electronic module. The cooling arrangement comprises a cooling surface adapted to be attached against the base plate of the power electronic module, wherein the cooling arrangement comprises further one or more heat pipes formed in the cooling surface for spreading the heat in the cooling arrangement and removing the heat from the cooling arrangement. The power electronic assembly comprises further a carbon based material layer arranged between the base pate of the power electronic module and the cooling surface of the cooling arrangement, the carbon based material layer being adapted to spread the heat generated by the semiconductor power electronic switch components and to transfer the heat from the power electronic assembly to the cooling arrangement.
Abstract:
The present disclosure describes a method and an arrangement for synchronizing positions of at least two actuators. The actuators are actuated with electric motors which are controlled by frequency converters. For each actuator, the frequency converter is used for estimating a rotational speed of the motor, and at least one position indicator on the actuator is used for indicating when the actuator reaches a predetermined position. A position indication time instant of the actuator reaching the predetermined position is detected, and at least one position indication time difference between the detected position indication time instants is calculated. At least one of the electric motors is controlled on the basis of the at least one calculated position indication time difference.
Abstract:
A method and an arrangement of controlling a reverse-conducting IGBT (RC-IGBT) component in a circuit comprising a series connection of controllable switch components where at least one of the controllable switch components is an RC-IGBT and the other component is to be controlled to a conductive state. The method comprising applying a pre-trigger pulse to the gate electrode of the RC-IGBT during reverse conduction of the RC-IGBT at a first time instant (t 1 ), the pre-trigger pulse corresponding to a turn-on gate pulse, applying a turn-on gate pulse at a second time instant (t 2 ) to the other controllable switch component of the series connection for controlling the other controllable switch component to a conductive state such that the pre-trigger pulse and the turn-on gate pulse overlap, and ending the pre-trigger pulse after a delay time at the third time instant (t 3 ), the delay time being the time period when the turn-on gate pulse and the pre-trigger pulse overlap.
Abstract:
A frequency converter comprising a display panel, wherein the display panel is adapted to display information relating to operation or to set up of the frequency converter as graphical icons.
Abstract:
A method and an arrangement of limiting temperature variations in a semiconductor component of a switching converter, the method comprising determining a quantity relating to operation temperature of the switching converter, determining temperature of the semiconductor component, selecting a maximum value of switching frequency of the switching converter based on the determined quantity relating to operation temperature of the switching converter and the temperature of the semiconductor component, and limiting the switching frequency of the semiconductor component of the switching converter to the selected switching frequency.
Abstract:
A cooling device comprising a first chamber (1), a second chamber (2) separated from the first chamber (1), heat exchanger means (4) adapted to transfer heat from the first chamber (1) to the second chamber (2), and fan means. The first chamber (1) comprises an inlet flow opening (12) and an outlet flow opening (14). The fan means is adapted to generate a first cooling medium flow (511) inside the first chamber (1) between the inlet flow opening (12) and the outlet flow opening (14) such that heat is transferred from the first cooling medium flow (511) into the heat exchanger means.