Method for operating a wind energy installation

  • US 8,487,461 B2
  • Filed: 01/06/2009
  • Issued: 07/16/2013
  • Est. Priority Date: 01/07/2008
  • Status: Active Grant
First Claim
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1. A method for operating a wind energy plant having a double-fed asynchronous machine, at least one inverter and at least one control device, wherein electrical energy is at least partly supplied to a grid via the inverter, wherein the inverter comprises per phase at least one power semi-conductor module having at least two transistor circuits and at least two free-wheeling diodes as components, and wherein the control device actuates the inverter at least at times via a pulse width modulation (PWM), the method comprising:

  • altering, at frequencies of currents to be impressed by the inverter on a machine side of less than 10 Hz, the switching frequency of the transistor circuits and/or of the free-wheeling diodes of the inverter via the control device depending upon the thermal heating of the respective components such that the number of switching operations in the power semi-conductor module is reduced.

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