Patent application number | Description | Published |
20110266871 | Power Interchange system for interchanging electric energy between a battery and an electric grid, method for interchanging electric energy between a battery and an electric grid and application of the power interchange system - A power interchange system for interchanging electric energy between a battery and an electric grid is provided The power interchange system includes a rectifier unit for converting alternating current of the electric grid into direct current for charging the battery; a grid measurement device for measuring an electric parameter of the electric grid, and a controller unit for adjusting the direct current for the charging the battery as a function of the electric parameter of the electric grid. Moreover a method for interchanging electric energy between a battery and an electric grid is provided. | 11-03-2011 |
20110285130 | Power System Frequency Inertia for Wind Turbines - A wind turbine system and method are provided. The wind turbine system includes a wind turbine operable to supply wind power to an utility system; a synchronous generator coupled to the utility system; a grid measurement device arranged for measuring the current and power that is exchanged between the synchronous generator and the utility system; a controller for adjusting the output power of the wind turbine as a function of the power and current that is measured by the grid measurement device; and a means of communication between the grid measurement device, controller and/or the wind turbine, wherein the wind turbine is configured to provide current and power to the utility system as a function of the measured power and current of the grid measurement device. | 11-24-2011 |
20120061963 | Power system frequency inertia for power generation system - A power generation system is provided. The power generation system including a power generation unit operable to supply electrical power to an utility system; a synchronous machine coupled to the utility system; a grid measurement device arranged for measuring the current and power that is exchanged between the synchronous machine and the utility system; a controller for adjusting the output power of the power generation unit as a function of the power and current that is measured by the grid measurement device; and a communication link between the grid measurement device, controller and/or the power generation unit. The power generation unit is configured to provide current and power to the utility system as a function of the power and current that is measured by the grid measurement device. | 03-15-2012 |
20120150524 | FAULT-RIDE-THROUGH METHOD, CONVERTER AND POWER GENERATING UNIT FOR A WIND TURBINE - A fault-ride-through method is provided. The method includes detecting a voltage dip on a power line transmitting electric power. If a voltage dip is detected, the method includes reducing an active current and/or an active power to a specific value, which active current and/or active power is fed by a power generating unit at a feeding point into a power network having a plurality of power lines. Further, a converter of a power generating unit is provided, that is capable of implementing the fault-ride-through method. The power generating unit may be a part of a wind turbine in a wind farm. | 06-14-2012 |
20130241202 | ELECTRICAL YAW DRIVE FOR A WIND TURBINE, WIND TURBINE AND METHOD FOR OPERATING A WIND TURBINE - An electrical yaw drive for a wind turbine is described, wherein the wind turbine includes a wind turbine nacelle and a wind turbine tower. The electrical yaw drive has an asynchronous motor, an excitation capacitor bank and dump loads, wherein the excitation capacitor bank and the dump loads are electrically connectable to windings of the asynchronous motor. Furthermore, a wind turbine with such an electrical yaw drive and a method for operating such a wind turbine are described. | 09-19-2013 |
20150014992 | OPERATING WIND TURBINES AS DAMPING LOADS - A control device, method, and computer program for a wind park are provided, the wind park having a plurality of wind turbines for generating electric power, wherein the wind turbines are electrically interconnected by a wind park grid. The control device includes (a) a determining unit for determining whether a wind park load for consuming electric power from the wind park grid is to be enabled, (b) a calculating unit for calculating a power reference value for each of the plurality of wind turbines, the power reference value being indicative of the amount of power which the corresponding wind turbine should produce, and (c) a transmitting unit for transmitting the calculated power reference values to the corresponding wind turbines, wherein, if the determining unit has determined that the wind park load is to be enabled, at least one of the power reference values calculated by the processing unit is negative. | 01-15-2015 |
20150108764 | SINGLE PIECE ELECTRIC ASSEMBLY FOR CONNECTING AN OFF-SHORE WIND TURBINE WITH AN ELECTRIC SUBSEA CABLE, WIND TURBINE, WIND TURBINE CLUSTER AND METHOD FOR MOUNTING SUCH AN ELECTRIC ASSEMBLY TO A WIND TURBINE TOWER - An electric assembly for electrically connecting at least one wind turbine being located off-shore with an electric subsea cable being connected to an on-shore power grid is provided. The electric assembly has (a) a transformer for transforming a first voltage level being provided by the at least one wind turbine to a second voltage level of the subsea cable, and (b) an external equipment being electrically and mechanically connected to the transformer for controlling an operation of at least the transformer. The transformer and the electric equipment are formed by a preinstalled package, which can be mechanically handled as a single piece. Further, a wind turbine having such an electric assembly, a wind turbine cluster having such a wind turbine, and a method for mounting such an electric assembly to a tower of a wind turbine are provided. | 04-23-2015 |
20150108952 | COMPENSATION OF REACTIVE POWER AT A SUBSEA AC TRANSMISSION CABLE HAVING AN OFF-SHORE INPUT END AND AN ON-SHORE OUTPUT END - A transmission system and a method for transmitting electrical power which has been produced by at least one off-shore wind turbine to a utility grid being located on-shore is provided. The transmission system has (a) an off-shore transformer, which is connectable to the at least one wind turbine and which is configured for changing a first AC voltage level provided by the at least one wind turbine to a second AC voltage level, (b) a subsea AC transmission cable having an off-shore input end and an on-shore output end, wherein the input end is connected to the off-shore transformer, and (c) a compensation unit for compensating at least partially a reactive power being produced within the subsea AC transmission cable, wherein the compensation unit is electrically coupled to the subsea AC transmission cable at a node being located in between the off-shore input end and the on-shore output end. | 04-23-2015 |