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US 2015/0088326 A1Published application
Wind farm with fast local reactive power control
AssigneeSenvion SE
InventorJens Fortmann
Life of this patent
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AssigneeSenvion SE
InventorJens Fortmann
Estimating the term…
Wind farm comprising a farm master (1) and a plurality of wind energy installations (4). The farm master (1) has a controller (15) with an input for a control parameter for power supplied to a grid and transmits desired value specifications to a local controller (5) of the wind energy installations (4). According to the invention, the local controller (5) has dual structure and comprises a desired value channel (6), to which the desired value specification is applied by the farm master (1) and which is designed to output a stationary reactive power desired value, and a responsive channel (7) comprising an autonomous controller (75), to which no desired value specification is applied by the farm master (1) and to which an actual voltage of the particular wind energy installation (4) is applied via a washout filter (71). The autonomous controller (75) with the washout filter (71) enables a fast and dependent response to transient disturbances, in particular voltage spikes and voltage dips as a result of a short circuit. The individual wind energy installation and the wind farm as a whole therefore gain a behaviour which is identical to a synchronous generator and is very favourable for grid stability in the event of voltage disturbances.
A wind farm comprising a farm master (1), a farm grid (3) and a plurality of wind turbines (4) for feeding power to a grid (99) in accordance with a control parameter, wherein the farm master (1) has a controller (15) comprising an input for the control parameter and an input for the actual value for the fed power, and an output unit (16), which outputs setpoint value presets to the wind turbines (4), wherein the wind turbine (4) has a generator driven by a wind rotor (40) and comprising a converter (45) for generating electrical energy and outputting said energy to the farm grid (3) and a local controller (5) for the setpoint value preset applied by the farm master (1),
The wind farm as claimed in one of the preceding claims, characterized in that the washout filter (71) is formed from a submodule (72) for determining a smoothed voltage profile and a differential element (74), to the other input of which an actual value for the voltage is connected.
The wind farm as claimed in one of the preceding claims, characterized in that the setpoint value channel (6) has a dedicated controller (65), which is preferably parameterized corresponding to the autonomous controller (75).
The wind farm as claimed in one of the preceding claims, characterized in that the washout filter (71) comprises a memory (72′), which outputs a steady-state voltage value which is smooth for the voltage of the wind turbine (1).
The wind farm as claimed in one of the preceding claims, characterized in that the autonomous controller of the wind turbine is matched to the controller at the farm master in such a way that the autonomous controller is faster than the controller at the farm master.
A wind turbine comprising a generator (42) driven by a wind rotor (40) and comprising a converter (45) for generating electric power and outputting said electric power to a grid (3) and a local controller (5), which acts on the converter (45) and has an input for an externally applied setpoint value preset,
A method for operating a wind farm comprising a farm master (1), a farm grid (3) and a plurality of wind turbines (4) for feeding power into a grid (99) in accordance with a control parameter, wherein the farm master (1) has a controller (15) comprising an input for the control parameter and an input for actual values for the fed power and an output unit (16), and the wind turbine (4) has a generator driven by a wind rotor (40) and comprising a converter (45) and a local controller (5), wherein setpoint value presets are output to the wind turbines (4) by the controller in the farm master, which wind turbines generate electrical energy on the basis of the applied setpoint value presets and output this electrical energy to the farm grid (3),
Dependencies are inferred from the claim text.