A method of controlling the operation of a wind turbine is provided. The wind turbine includes a rotor, a generator and at least one heat generating component. The method includes obtaining a temperature of the heat generating component; determining the presence of a predetermined increase of the temperature of the heat generating component; and upon determining the presence of the predetermined temperature increase, controlling the rotational speed of the generator so as to increase the rotational speed of the generator while not increasing the electrical power output of the generator or while increasing the electrical power output of the generator at a smaller proportion than the increase in rotational speed of the generator so as to reduce the level of electrical current in the generator.

Invention relates to renewable Wind energy combining drag and lift forces into usable torque, having adjustable blades panels with sub blades. Its unique feature is to convert reverse drag into usable lift and combine the two forces in to one cohesive force. The system comprises output drive rotor arranged on a tower base, with its rotating arms with blade panel assemblies mounted rotatably. Each blade panel assembly comprises an auxiliary rotary shaft having sub-blade panels pivotable at one or more pivot points with primary or secondary control arrangements for blocking and/or allowing wind to pass through the blade panels partially or fully. The system further includes sensors to collect control information, coupled to Main Control Unit (MCU) and secondary control arrangements, configured to provide one or more energy forms.

The application relates to a battery storage and a wind turbine including a generator for generation of an electric current. An electric flow path configured for conducting the electric current to an electric grid via a power converter, the power converter. A battery storage electrically connected to the electric flow path, the battery storage including a plurality of battery cells, each battery cell including at least one battery element and at least two semiconductor switches. Wherein a controller is configured for selectively controlling the voltage over the battery storage by controlling the status of the at least two semiconductor switches of a plurality of the battery cells and thereby if a current path through the battery storage is bypassing the at least one battery element or passing through the at least one battery element of one or more of the plurality of battery cells.

Aspects of the present invention relate to a method for controlling an amount of power to be delivered from a wind turbine generator to a power grid during an abnormal power grid event, the method comprising the steps of detecting an abnormal power grid event; controlling an active current delivered to the power grid in response to a measured or determined total active current; and controlling a reactive current delivered to the power grid in response to a measured or determined total reactive current. Aspects of the present invention further relate to a computer program product for carrying out the method as well as a wind turbine generator being capable of carrying out embodiments of the invention.

A method for recording the magnitude and phase of electrical voltage in an electrical three-phase supply network for a fundamental and at least one harmonic is provided. The method includes measuring an electrical three-phase voltage of the supply network, transforming the measured voltage values into polar coordinates using a rotating voltage phasor for the fundamental as a measured reference phasor, and respectively observing values of at least one voltage phasor for the fundamental and of at least one voltage phasor for at least one harmonic to be recorded with the aid of a state observer, and tracking the observed values on the basis of the measured reference phasor.

Provided is a method of determining an upper limit value for an active power controller of a wind park including plural wind turbines connected at a point of common coupling, the method including: estimating a cumulative loss of active power occurring between output terminals of the plural wind turbines and the point of common coupling; determining the upper limit value based on the estimated loss of active power.

A method and an apparatus for controlling wind turbine power. The method includes: determining a compensation value for target active power based on a power difference between a net grid-connected power and the target active power; determining a setpoint value of active power based on the target active power and the compensation value; and performing a current-varying control and a pitch control based on the setpoint value of active power.

A method of controlling the operation of a wind turbine is provided. The wind turbine includes a rotor, a generator and at least one heat generating component. The method includes obtaining a temperature of the heat generating component; determining the presence of a predetermined increase of the temperature of the heat generating component; and upon determining the presence of the predetermined temperature increase, controlling the rotational speed of the generator so as to increase the rotational speed of the generator while not increasing the electrical power output of the generator or while increasing the electrical power output of the generator at a smaller proportion than the increase in rotational speed of the generator so as to reduce the level of electrical current in the generator.

A method for operating a wind turbine for generating electrical power from wind, wherein the wind turbine has an aerodynamic rotor with a rotor hub and rotor blades of which the blade angle is adjustable, and the aerodynamic rotor can be operated with a variable rotation speed, and the wind turbine has a generator, which is coupled to the aerodynamic rotor, for the purpose of generating a generator power, wherein the generator can be operated with a variable generator torque, comprising the steps of: determining a loading variable which indicates a loading on the wind turbine by the wind, and reducing the rotation speed and/or the generator power in a loading mode depending on the loading variable, wherein at least one force variable that acts on the wind turbine is used for determining the loading variable or as the loading variable.

A control system for controlling the operation of a doubly fed induction generator of an electrical power system, such as a wind turbine, is provided. A rotor side converter coupled to a rotor of the DFIG is controlled by the control system. The control system includes an outer controller to generate a reference value for a control variable in accordance with which the operation of the DFIG is to be controlled and an inner controller that receives the reference value and provides feedback control of the rotor side converter. The inner controller is a state feedback controller obtains at least one state of the power system or the power grid that is different from the control variable. The control structure of the state feedback controller causes the electrical power system to act as a passive system at least in a predefined frequency range.