Method and System for Determining a Setpoint Signal of a Wind Energy Conversion System

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This patent describes a method and system for controlling the output power of a wind energy conversion system (such as a wind turbine or wind farm) in response to frequency variations in the grid. The system processes signals representing the grid frequency and the wind turbine rotor's speed to generate a setpoint signal that dynamically adjusts the wind energy system's output. The control method uses advanced signal processing and filtering to identify both periodic (cyclical) and aperiodic (unexpected) frequency deviations, allowing the system to correct its output power to support grid stability, while maximizing power capture and staying within safe operational limits of the turbines.

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• Grid-connected wind farms that need to help stabilize grid frequency, especially in regions with high wind power penetration.
• Wind turbine manufacturers seeking to enhance the grid-support capabilities of their systems.
• Operators of renewable power plants integrating wind with other resources to improve system stability without relying on additional energy storage devices.
• Smart grid control centers leveraging wind plants for ancillary services such as frequency regulation or primary frequency response.

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• Mitigates grid frequency variations, enhancing the stability and reliability of electric power systems with high wind energy penetration.
• Enables wind turbines to provide active grid support without the need for additional energy storage hardware, reducing costs.
• Maximizes wind power extraction while ensuring turbine operation stays within safe mechanical limits.
• Adapts dynamically to changing grid conditions through online signal processing and automatic filter tuning.
• Supports both cyclical (predictable) and aperiodic (unexpected) frequency deviations in the grid, offering comprehensive frequency support.

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Patent Abstract

A method for determining a setpoint signal of a wind energy conversion system (10) is disclosed. The method comprises, in a system (12) having at least one signal processing device (13, 14, 15): providing a first input signal, comprising system frequency values of an electric power system (11), and a second input signal comprising an angular speed value of a wind energy conversion system (10); determining, from the first input signal, an intermediate signal comprising system frequency deviation values, the system frequency deviation values indicating deviations between the system frequency values and a target frequency value; determining, from the intermediate signal and the first input signal, a power correction signal comprising a first power value; determining, from the second input signal, a first reference signal comprising a second power value corresponding to a point of maximum power extraction of the wind energy conversion system (10); and determining, from the power correction signal and the first reference signal, a setpoint signal for setting an output power value of the wind energy conversion system (10). Further, a system (12) for determining a setpoint signal of a wind energy conversion system (10) is provided.