| WOODWARD SEG GMBH & CO. KG Patent applications |
| Patent application number | Title | Published |
|---|
| 20110006528 | METHOD FOR OPERATING A WIND TURBINE - A method for operating a wind turbine that includes a generator device for outputting electric energy to a network, the generator device having a stator, and a controller device for controlling the generator device. To ensure sufficient protection of the wind turbine even during network fluctuations, a network voltage is determined using a network model at least as a function of a stator voltage measured with a first measuring apparatus and a network power measured with a second measuring apparatus, and the determined network voltage and a predeterminable maximum phase angle present between the stator voltage and network voltage are used to determine the maximum effective power of the wind turbine that can be output, and the output effective power is regulated as a function of the determined maximum effective power that can be output and a target effective power predetermined by the control device. | 01-13-2011 |
| 20100277134 | METHOD FOR OPERATING A WIND ENERGY INSTALLATION - The invention relates to 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 into a grid via the inverter, the inverter comprises per phase at least one power semi-conductor module with at least two transistor circuits and at least two free-wheeling diodes and the inverter by using the control device is actuated at least at times via a pulse width modulation (PWM). The object, namely of providing a generic method for operating a wind energy plant in which an improved power output is effected even in the low-noise rotational speed range of the rotors, is achieved in that, at frequencies of the current to be impressed by the inverter on the machine side of less than 10 Hz, preferably less than 6 Hz, the switching-on duration and/or the switching frequency of the transistor circuits and/or of the free-wheeling diodes of the inverter are altered via the control device by taking their thermal heating into account. | 11-04-2010 |
| 20100117605 | METHOD OF AND APPARATUS FOR OPERATING A DOUBLE-FED ASYNCHRONOUS MACHINE IN THE EVENT OF TRANSIENT MAINS VOLTAGE CHANGES - The invention relates to a method and a device for operating an asynchronous motor ( | 05-13-2010 |
| 20090267572 | CURRENT LIMITATION FOR A DOUBLE-FED ASYNCHRONOUS MACHINE - In a method and an apparatus for controlling the output or drawn active and reactive power of a double-fed asynchronous machine ( | 10-29-2009 |
