Method and device for compensating vibration effects in the event of network unbalance in a double-fed asynchronous machine

摘要

In a method for compensating rotor torque harmonics, intermediate circuit voltage and / or reactive power oscillations in the event of network asymmetries in a double-fed asynchronous machine (1), it is provided that current machine sizes are measured and / or derived, each machine size computationally in each case, a negative sequence component and optionally a DC component is decomposed and that for Mitsystemkomponenten, negative sequence components and optionally for the DC components of the machine sizes each separate control elements for controlling a manipulated variable are present to which the respective components of the machine sizes are supplied as input components and whose output values are superimposed additively. In this case, the control elements are designed to regulate the control variable derat that the torque, DC link voltage and / or reactive power oscillations is counteracted. Alternatively, a control element is provided to which the cross product of Mitsystemgrößen and negative sequence sizes and the cross product of negative sequence and Mitsystemgrößen is supplied as an input variable, wherein the control element is designed to control the manipulated variable such that torque, intermediate circuit voltage and / or reactive power oscillations second order counteracted.