Variable Speed Wind Power Generation System Voltage Stability
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Solution Overview
Problem
Wind power generation systems face voltage fluctuations due to varying wind energy input, which conventional torque control methods struggle to manage effectively, especially in regulating reactive power output.
Innovation Solution
A variable speed wind power generation system with a wind turbine, generator, power converter, blade angle control, and generator control means that adjusts blade angles and active switch control to regulate power output based on wind speed and rotating speed commands, allowing independent control of active and reactive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If torque control is used for generation control, then the generated active power varies with the fluctuation of the rotating speed of the wind turbine, but voltage fluctuation in the power system cannot be effectively suppressed
Solution Approach 1:
The patent changes the control parameter from torque control to power control. The generation power command means determines a generation power command value based on wind speed, and the generator control means regulates the generated power to match this command value. This parameter change allows the system to maintain stable power output despite wind speed fluctuations, thereby suppressing voltage fluctuation in the power system.
2Ease of operation
If power factor control is used, then the reactive power output is small when the generated power is small, but sufficient reactive generation power cannot be obtained to suppress voltage fluctuation
Solution Approach 1:
The patent segments the control of active power and reactive power into independent channels. The generation power command means controls active power output based on wind speed, while the reactive power command means independently controls reactive power output based on power system voltage conditions. This segmentation allows the wind power generation system to provide sufficient reactive power for voltage support regardless of the active power level.
Solution Approach 2:
The patent implements dynamic control where the reactive power command value is adjusted in real-time based on the operating state of the power system. The reactive power command means determines the reactive power command value according to voltage fluctuation conditions, enabling the system to dynamically provide appropriate reactive power support when needed.
3Adaptability or versatility
If variable speed control is implemented, then the generator can adapt to wind speed changes, but the system complexity increases with multiple control loops
Solution Approach 1:
The patent merges the wind turbine control and generator control into an integrated control system. The generation power command means receives wind speed information and generates a unified generation power command value that coordinates both the blade angle control and the generator power conversion. This merging reduces control complexity while maintaining adaptability to wind speed changes.
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 reduces voltage fluctuations in the power system by stabilizing generated power output and enabling large reactive power output even with small active power, effectively managing power system conditions.
Implementation Method 1
A wind power generation apparatus receives wind energy on its blades and then converts it into rotational energy to generate rotational torque at a rotor of a generator
Implementation Method 2
The wind power generation apparatus produces electric power from wind-induced torque by generating a magnetic field at the rotor (or stator or both of them)
Data Source
AI summary
A variable speed wind power generation system including a wind turbine, a generation power command unit for generating a generation power command value based on a state quantity of the wind turbine and a generator control unit for controlling the power converter for controlling electric power of the generator, wherein the generator control unit operates to regulate the generation power of the generator in order to change the generation power amount according to the generation power command value.