Wind Turbine Converter Control for Grid Frequency Stabilization
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Solution Overview
Problem
Wind turbines do not contribute to frequency stabilization and power-swing stabilization in utility systems during transient conditions, unlike traditional synchronous generators, leading to a need for improved control techniques to enable wind turbines to participate in frequency regulation and power-swing stabilization.
Innovation Solution
A wind turbine system with a controller using an internal reference frame to modulate power flow in response to frequency disturbances or power swings, employing a supplemental input signal to stabilize the utility system, and incorporating energy storage and dissipative elements to manage power and torque within defined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wind turbines are used for power generation in utility systems, then power supply capacity is improved, but frequency stabilization capability deteriorates
Solution Approach 1:
The patent implements dynamic control of wind turbine power output by continuously adjusting the power contribution based on real-time system frequency conditions. The controller modulates the wind turbine's power output dynamically during transient events, enabling the wind turbine to provide frequency stabilization services while maintaining its primary power generation function. This dynamic adjustment allows the system to respond adaptively to changing grid conditions.
Solution Approach 2:
The patent changes the operational parameters of wind turbines by modifying their power output levels in response to system frequency disturbances. During transient conditions, the controller adjusts the power contribution parameter of wind turbines to provide supplemental power that stabilizes system frequency. This parameter modulation enables wind turbines to transition from passive power generators to active frequency regulators.
2Device complexity
If conventional fixed frequency reference control is used in wind turbines, then control simplicity is improved, but responsiveness to frequency disturbances deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the wind turbine controller continuously monitors system frequency conditions and adjusts power output accordingly. The controller receives feedback signals indicating system frequency deviations and responds by modulating the wind turbine's power contribution. This closed-loop feedback enables rapid response to frequency disturbances while maintaining manageable control complexity through established control algorithms.
Data Source
AI summary
An exemplary embodiment includes a wind turbine system. The wind turbine system includes a wind turbine generator operable to supply wind turbine power to a utility system. A converter is coupled to the wind turbine generator and the utility system. The wind turbine system also includes a controller comprising an internal reference frame of the wind turbine generator, coupled to the converter, and configured for modulating flow of power through the converter in response to frequency disturbances or power swings of the utility system relative to the internal reference frame.