Method for operating a wind power plant having a doubly-fed asynchronous machine and wind power plant having a doubly-fed asynchronous machine

摘要

A method for operating a wind energy plant having a doubly-fed asynchronous machine, a grid-sided converter and a generator-sided converter both being controlled by a control means.;In a regular operating mode the converters are controlled by the control means by means of command variables for the regular operating mode. In case of a grid fault the converters are controlled by at least one control module which (i) controls the torque and/or the active power and (ii) controls the reactive current and/or the reactive power by means of command variables such that a disconnection of the asynchronous machine from the grid will be performed only if the grid voltage falls below a predetermined voltage-time-characteristic curve, wherein the shape of the voltage-time-characteristic curve is configured by a plurality of pre-selectable parameters in the at least one control module, wherein at least one first command variable function is provided which in the case of fault provides a command variable for the torque and/or the active power and which comprises at least two basic functions, a first basic function thereof determining the set point for the torque and/or the active power following the occurrence of a fault, and a second basic function thereof determining the set point for the torque and/or the active power following completion of the fault, and wherein at least one second command variable function for the reactive current and/or the reactive power is provided which in the case of fault provides a command variable for controlling of at least one of the converters and which comprises at least two basic function, a third basic function thereof determining the set point for the reactive power and/or the reactive current following the occurrence of a fault, and a fourth basic function thereof determining the set point for the reactive power and/or the reactive current following completion of the fault.