Wind Farm Power Limit Control Without Oscillation
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Solution Overview
Problem
Existing wind farm control systems face challenges in efficiently distributing power limits among wind turbines, especially when some turbines are not operational or of different sizes, leading to suboptimal power feed-in to the electrical supply grid, and existing solutions like integral controllers can result in oscillations and slow control responses.
Innovation Solution
A method that uses a control context table to determine a single control value for each wind turbine based on its nominal power, allowing for efficient distribution of the maximum group power, with a percentage value that can be directly applied to each turbine, and includes a limit control value to prevent unnecessary power reduction due to wind speed fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a uniform distribution of power limit is applied to all wind turbines, then the control implementation is simple, but the power feed-in efficiency deteriorates when turbines are non-operational or of different sizes
Solution Approach 1:
The patent applies local quality by differentiating the power limit distribution method according to the specific characteristics of each wind turbine. Instead of uniform distribution, the system calculates individual power limits for each turbine based on its rated power, operational status, and contribution to the total farm output. This allows each turbine to have a customized limit that optimizes overall power feed-in while maintaining manageable control complexity.
2Reliability
If integral controller is used to correct power difference, then the power limitation can be achieved, but oscillations occur and control response becomes slow
Solution Approach 1:
The patent applies preliminary action by pre-calculating the power limit values for each wind turbine based on their rated powers and operational statuses before the power limitation is enforced. The control system determines the distribution factors and individual limits in advance, so when the power limitation is applied, the turbines can immediately adjust to the pre-determined limits without requiring slow integral correction, thus avoiding oscillations while achieving reliable power limitation.
3Reliability
If each turbine adjusts operating point significantly, then the power limit can be enforced, but multiple adjustments are needed before stable control is achieved
Solution Approach 1:
The patent applies parameter changes by modifying the power limit parameters for each turbine based on their rated powers and operational statuses. The system calculates distribution factors that proportionally allocate the total power limit to each turbine according to its capacity and availability. This parameter-based approach allows turbines to make small, coordinated adjustments to their operating points rather than significant individual adjustments, achieving stable control faster while reliably enforcing the power limit.
Data Source
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AI summary
The invention relates to a method for controlling a group of wind turbines (100) comprising several wind turbines, wherein each of the wind turbines (100) generates electrical power as plant power (PA) for feeding into an electrical supply network (120, 320), the group of turbines feeds a group power (PG) into the electrical supply network (120, 320) at a network connection point (118, 318), wherein the group power is essentially formed from a sum of all plant powers (PA) of the plant group, a group maximum power is specified to limit the group power, and a control value is transmitted to each wind turbine (100) of the plant group to limit the plant power of the respective wind turbine (100) to a maximum value defined by the control value.To determine the tax value, a tax relationship is established as a relationship between potential tax values (Pc) and potential group outputs (PGP), and the tax value is determined using the tax relationship and depending on the given maximum group output (PGm).