Wind Turbine Output Control via Power Gradient Detection
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Solution Overview
Problem
Existing wind turbine generators face challenges in accurately detecting and compensating for output power fluctuations, leading to complex configurations and inefficiencies in stabilizing power supply to the utility grid.
Innovation Solution
A wind turbine generator system that determines the gradient of output power changes and uses a control unit to adjust power based on this analysis, employing inertial force and secondary battery charging/discharging to match grid frequency requirements, with options for blade pitch control and selective battery charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-frequency cut filter is used to detect power fluctuations, then the accuracy of fluctuation detection is improved, but the device complexity increases
Solution Approach 1:
The patent extracts only the necessary detection function by using a simple gradient calculation based on power detection values at different time points, removing the need for complex high-frequency cut filters while maintaining the ability to detect power fluctuations accurately
Solution Approach 2:
The patent replaces the mechanical/electrical high-frequency cut filter system with a computational approach using gradient calculation of power detection values, substituting physical filtering components with mathematical processing to achieve the same detection purpose
2Reliability
If the difference between generator output power and inverter output power is used for battery charge/discharge control, then the power compensation effectiveness is improved, but the control complexity increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring the gradient of generator output power and adjusting the inverter output power accordingly, using the detected power change trend to dynamically control the battery charge/discharge rate and maintain grid power stability
Solution Approach 2:
The patent performs preliminary detection of the power change gradient before executing battery charge/discharge control, allowing the system to anticipate power fluctuations and prepare appropriate compensation actions in advance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively compensates for power fluctuations with a simple configuration, ensuring stable power supply to the grid by accurately detecting output changes and utilizing stored energy and inertial forces.
Implementation Method 1
rotates a wind turbine rotor 16 having a plurality of blades by receiving wind thereon
Implementation Method 2
wind turbine rotor having a plurality of blades by receiving wind thereon
Implementation Method 3
drives a generator 20 with the rotation of the wind turbine rotor 16
Implementation Method 4
a secondary battery that can be charged/discharged is connected in series between the rectifier and the inverter
Implementation Method 5
compensate for the difference between the output power of the generator and the power required by the utility grid with at least one of inertial force accumulated in the wind turbine rotor
Data Source
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AI summary
A wind turbine generator (10) derives the gradient of a change in output power of a generator (20) that generates power by rotation of a wind turbine rotor (16), and determines an increase/decrease in the output power of the generator (20) on the basis of the derived gradient of the change in output power. Then, when the frequency of a utility grid (42) has dropped, power control is performed on the basis of the determination results. Therefore, a decrease in the amount of power supplied to the utility grid (42) can be more effectively compensated for by accurately detecting output power fluctuations of the generator (20), using a simple configuration.