Wind Farm Control System for Grid Stability
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Solution Overview
Problem
Wind turbine generators in a wind farm face disconnection due to varying wind conditions, leading to reduced power output and inability to rapidly respond to frequency fluctuations in the utility grid, as uniform deloading and inertia control methods fail to account for individual turbine conditions.
Innovation Solution
A wind farm control system that measures and sets individual wind turbine generator power output limitations based on rotor speed and wind speed, adjusting deloading amounts and inertial energy usage to prevent disconnection and maintain grid stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same deloading amount is applied uniformly to all wind turbine generators in the wind farm, then the power output limitation can be simplified and easier to manage, but wind turbine generators operating under weak wind conditions may experience excessive energy loss causing rotor disconnection
Solution Approach 1:
The patent applies local quality by transitioning from uniform deloading control to individualized control based on each wind turbine generator's actual wind conditions. The control system determines deloading amounts separately for each turbine based on its specific wind environment, ensuring that turbines in weak wind conditions do not lose excessive energy while maintaining simplified overall management through automated individual assessment
Solution Approach 2:
The patent changes the control parameter from a fixed uniform deloading amount to a dynamic deloading amount that varies based on individual turbine wind conditions. The control system adjusts the deloading parameter for each turbine according to its specific operating conditions, preventing rotor disconnection while maintaining power output limitations
2Power
If inertia control is applied to all wind turbine generators to support primary frequency response, then the power output to the utility grid can be increased during frequency drops, but wind turbine generators under weak wind conditions may lose inertial energy causing rotor disconnection
Solution Approach 1:
The patent applies local quality by implementing differentiated inertia control for each wind turbine generator based on its wind conditions. Turbines operating under weak wind conditions are exempt from inertia control to prevent excessive energy loss and rotor disconnection, while turbines under adequate wind conditions can participate in inertia control to support grid frequency response
Solution Approach 2:
The patent introduces dynamics by making the inertia control participation dynamic and conditional rather than static and universal. The control system continuously assesses each turbine's wind conditions and dynamically determines whether to apply inertia control, allowing the system to adapt to changing wind conditions and maintain reliability while maximizing power output when conditions permit
3Reliability
If deloading amount is increased to reduce inertial energy loss, then the amount of inertia used decreases improving rotor stability, but the power output limitation increases reducing overall power generation
Solution Approach 1:
The patent changes the deloading parameter dynamically based on individual turbine wind conditions and grid requirements. Rather than using a fixed high deloading amount, the system adjusts the deloading parameter to the minimum necessary level for each turbine, maintaining rotor stability while maximizing power generation potential
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
Prevents wind turbine generator disconnection and maintains power supply to the grid by dynamically adjusting power output limitations based on real-time conditions, ensuring stable frequency and voltage support.
Implementation Method 1
a plurality of wind turbine generators 14 that generate electric power by the rotation of rotors 12
Implementation Method 2
a measuring portion that measures, for each of the wind turbine generators 14, a physical quantity related to increase and decrease in the power output of the corresponding wind turbine generator 14
Implementation Method 3
control (inertia control) that uses inertial energy (also referred to as inertia) stored in the rotors of the wind turbine generators as electric power
Data Source
AI summary
To prevent disconnection of wind turbine generators due to changes in wind conditions even if the wind turbine generators is operated to limit the power output. A plurality of wind turbine generators that generate electric power by the rotation of rotors are provided in a wind farm are interconnected and are operated while the power outputs are limited in advance so as to be able to further supply electric power to a utility grid in response to a decrease in the frequency or voltage of the utility grid. The rotational speed of the rotor, which is a physical quantity related to increase and decrease in the power output of the wind turbine generator, is measured for each of the wind turbine generators by a wind-turbine control system, and the limitation amount of the power output of the wind turbine generator is set for each of the wind turbine generators by a central control system on the basis of the rotational speed of the rotor measured.