Wind Turbine Frequency Regulation With Rotor and Energy Storage Control
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Solution Overview
Problem
Existing wind turbines face challenges in providing effective frequency regulation, particularly in responding quickly to grid frequency deviations due to limitations in pitch response time and continuous power loss from reserving power for negative frequency deviations.
Innovation Solution
A wind turbine and energy storage combined frequency regulation method that uses a mixed feedforward and feedback control approach to rapidly adjust power output by controlling the rotor, energy storage device, and pitch system in a coordinated manner, improving response speed and maintaining stable grid-connected power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pitch operation is used for frequency regulation, then power increment can be achieved, but frequency regulation response speed is slow (up to 5s)
Solution Approach 1:
The patent applies preliminary action by reserving a portion of power during normal MPPT operation through pitch control, creating a power reserve before frequency deviations occur. This allows the wind turbine to immediately release reserved power when negative frequency deviations occur, achieving fast response without waiting for pitch system activation. The control method determines reserved power based on wind speed and grid frequency conditions, ensuring rapid power increment capability.
2Reliability
If power limiting operation is used to reserve power for negative frequency deviation, then frequency regulation capability is improved, but continuous power generation loss occurs
Solution Approach 1:
The patent applies dynamics by making the pitch control strategy adaptive and dynamic rather than static. The control method dynamically adjusts pitch angle based on real-time wind speed and grid frequency conditions, transitioning between MPPT and power limiting modes as needed. This dynamic control ensures power is reserved only when necessary for frequency regulation, minimizing continuous power generation loss while maintaining reliability for when frequency support is needed.
Solution Approach 2:
The patent applies parameter changes by modifying operating parameters (pitch angle, power setpoint) based on grid frequency conditions. During normal operation, the system operates at MPPT with optimal parameters. When frequency deviations are detected, parameters are changed to release reserved power or activate frequency regulation modes, achieving reliable frequency support without permanent power loss.
3Speed
If rotor control is used for rapid power adjustment, then response speed is improved, but control stability becomes challenging
Solution Approach 1:
The patent applies feedback by implementing closed-loop control where the actual power output is continuously monitored and compared with the target power increment. The feedback signal is used to adjust rotor control commands in real-time, ensuring stable and accurate power adjustment. This feedback mechanism prevents overshoot and oscillations that would otherwise occur with rapid rotor control, maintaining control stability while achieving fast response.
Data Source
AI summary
A wind turbine and energy storage combined frequency regulation method and a wind turbine and energy storage combined frequency regulation device are disclosed. The wind turbine and energy storage combined frequency regulation method includes: determining a power increment required to be provided by a wind turbine and energy storage combined system; determining whether a rotor of a wind turbine is controllable; in response to determining that the rotor is controllable, generating a first power increment through a first mixed feedforward and feedback control manner based on the determined power increment; while controlling the rotor, generating a second power increment based on the determined power increment; generating a third power increment through a second mixed feedforward and feedback control manner based on the determined power increment.