Abstract: A composition can be used for producing a PMMA-based cast polymer with a low styrene content using urea (derivatives) as a formulation constituent, and a hydrophilic inorganic compound as a filler. It is possible to produce PMMA-based cast polymers and mouldings having surprisingly high mechanical stability from the composition.

Abstract: A wind farm with plural wind turbines which are connectible to a farm grid that is in turn connectible to an electricity supply mains via a connection point, wherein the wind farm features the following: a central control system, which determines a correction value for a local desired value for one or plural wind turbines by way of a first regulator, depending on an actual value of an electric variable before or after the connection point, and a turbine control for at least one wind turbine, which determines a local desired value for an electric variable to be generated by the wind turbine by way of a second regulator, depending on an actual value of an electric variable measured in the farm grid, wherein the turbine control determines the sum of the local desired value and the correction value as the total desired value for the electric variable of the wind turbine to be generated.

Abstract: A method for the operation of a wind energy plant with a double-fed asynchronous generator which has a mode of operation as a phase shifter, in which reactive power is fed into the electric power supply grid, the method having the following steps: the stator of the asynchronous generator is short-circuited, the asynchronous generator is run-up to a predetermined rotational speed from a working rotational speed range via a converter after running up, the short-circuit in the stator is cancelled, the double-fed asynchronous generator is synchronized with the electric power supply grid, and it is driven for the generation of reactive power.

Abstract: Method for torque and pitch control/adjustment for a wind power plant according to the rotational speed according to a characteristic curve, in which at partial load operation in a first section the torque is adjusted up to a first predetermined rotational speed, at partial load operation in a second section the torque is adjusted from the first rotational speed up to a second rotational speed, at full load operation in a third section at least one pitch of a rotor blade is adjusted for rotational speeds greater than the second rotational speed, at full load operation, in a fourth section, the pitch is adjusted for rotational speeds lower than the second rotational speed and greater than the third rotational speed, if a control has been previously carried out according to the third section, and at partial load operation in a fifth section the torque is adjusted for rotational speeds lower than the third rotational speed, if a control has been previously carried out according to the fourth section.

Abstract: A method for the operation of a wind energy plant with a double-fed asynchronous generator which has a mode of operation as a phase shifter, in which reactive power is fed into the electric power supply grid, the method having the following steps: the stator of the asynchronous generator is short-circuited, the asynchronous generator is run-up to a predetermined rotational speed from a working rotational speed range via a converter after running up, the short-circuit in the stator is cancelled, the double-fed asynchronous generator is synchronised with the electric power supply grid, and it is driven for the generation of reactive power.

Abstract: A method for the operation of a wind energy plant, with control of a reactive electric variable which is to be provided, wherein a desired value for the reactive electric variable is determined as follows: a first upper and/or a first lower limit value of the grid voltage is defined for the grid voltage, when the real value of the grid voltage exceeds the first upper limit value and/or the real value of the grid voltage falls below the first lower limit value, the desired value of the reactive electric variable is increased or diminished such that the deviation of the real value of the grid voltage from its desired value is counter-acted, wherein the desired value of the reactive electric variable is continuously increased or diminished further over the time, as long as the real value of the grid voltage exceeds the first upper limit value or falls below the first lower limit value.

Abstract: Method for the operation of a wind power plant with controllable effective power, wherein an idle power interval defined by a minimum idle power and a maximum idle power is assigned to each value of the effective power and the actual idle power can be controlled within this interval, characterized in that the effective power is reduced when a target idle power lies outside of the idle power interval assigned to the current effective power.

Abstract: A method for the operation of a wind energy plant, with control of a reactive electric variable which is to be provided, wherein a desired value for the reactive electric variable is determined as follows: a first upper and/or a first lower limit value of the grid voltage is defined for the grid voltage, when the real value of the grid voltage exceeds the first upper limit value and/or the real value of the grid voltage falls below the first lower limit value, the desired value of the reactive electric variable is increased or diminished such that the deviation of the real value of the grid voltage from its desired value is counter-acted, wherein the desired value of the reactive electric variable is continuously increased or diminished further over the time, as long as the real value of the grid voltage exceeds the first upper limit value or falls below the first lower limit value.

Abstract: A method for the operation of a wind turbine generator system adapted to be switched into the mains, including a variable-speed rotor, a torque governor, and a governor for the angle of blade attack, characterized in that the speed of the rotor is regulated by varying the angle of attack before the wind turbine generator system is switched into the mains.

Abstract: Method for the operation of a wind power plant with controllable effective power, wherein an idle power interval defined by a minimum idle power and a maximum idle power is assigned to each value of the effective power and the actual idle power can be controlled within this interval, characterized in that the effective power is reduced when a target idle power lies outside of the idle power interval assigned to the current effective power.

Abstract: A method for the operation of a wind turbine generator system adapted to be switched into the mains, including a variable-speed rotor, a torque governor, and a governor for the angle of blade attack, characterized in that the speed of the rotor is regulated by varying the angle of attack before the wind turbine generator system is switched into the mains.

Abstract: Method for torque and pitch control/adjustment for a wind power plant according to the rotational speed according to a characteristic curve, in which at partial load operation in a first section the torque is adjusted up to a first predetermined rotational speed, at partial load operation in a second section the torque is adjusted from the first rotational speed up to a second rotational speed, at full load operation in a third section at least one pitch of a rotor blade is adjusted for rotational speeds greater than the second rotational speed, at full load operation, in a fourth section, the pitch is adjusted for rotational speeds lower than the second rotational speed and greater than the third rotational speed, if a control has been previously carried out according to the third section, and at partial load operation in a fifth section the torque is adjusted for rotational speeds lower than the third rotational speed, if a control has been previously carried out according to the fourth section.