Wind Turbine Reactive Power Control With Voltage Safety Limits
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Solution Overview
Problem
Conventional reactive power control methods for wind turbines fail to consider the impact of reactive power on voltage fluctuations, leading to high/low voltage faults and inefficient operation, especially in wind farms where turbines are scattered and far from the substation.
Innovation Solution
A method and apparatus for controlling reactive power that adaptively evaluate the reactive power capability of wind turbines, considering system impedance and voltage safety ranges to optimize reactive power allocation and prevent faults, ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional reactive power control methods are used to maximize reactive power capability utilization, then reactive power output is improved, but voltage fluctuations occur causing high/low voltage faults
Solution Approach 1:
The patent implements dynamic reactive power capability evaluation that adapts to real-time system conditions. The reactive power capability is not fixed but dynamically adjusted based on current voltage levels, system impedance, and operational state, allowing the wind turbine to maximize reactive power output when safe and prevent voltage faults when limits are approached
Solution Approach 2:
The control method employs feedback mechanisms where the actual voltage and reactive power output are continuously monitored. This feedback is used to update the reactive power capability evaluation and adjust the reactive power command, creating a closed-loop control system that prevents voltage faults while maximizing reactive power utilization
2Productivity
If reactive power commands are issued without considering voltage safety ranges, then reactive power regulation effectiveness is improved, but wind turbine faults occur due to voltage exceeding safety thresholds
Solution Approach 1:
The patent performs preliminary evaluation of reactive power capability before issuing commands. By assessing the voltage safety range and system conditions in advance, the control method determines the maximum safe reactive power output, preventing voltage faults before they occur while maintaining effective reactive power regulation
3Device complexity
If uniform reactive power control is applied to all wind turbines, then system simplicity is maintained, but individual turbine voltage stability is compromised due to varying line parameters and locations
Solution Approach 1:
The patent implements local adaptive control where each wind turbine's reactive power capability is evaluated based on its specific conditions including line parameters, distance from substation, and local voltage levels. This localized approach allows each turbine to optimize its reactive power output independently, maintaining voltage stability despite varying locations and system complexity
4Power
If reactive power capability is maximized without safety constraints, then reactive power support is improved, but voltage fluctuations cause ride through faults
Solution Approach 1:
The patent changes the operational parameters by introducing voltage safety ranges and system impedance considerations into the reactive power capability evaluation. This parameter-based approach allows the wind turbine to provide maximum reactive power support when system conditions permit while automatically reducing output when voltage safety thresholds are approached, preventing ride through faults
Data Source
AI summary
Methods and apparatuses for controlling reactive power of a wind turbine, and a wind farm are provided. An exemplary method includes: obtaining operation data of single wind turbines in a wind turbine group at the current time point; determining the total maximum capacitive reactive capacity and total minimum inductive reactive capacity, satisfying a safety constraint condition at the next time point, of the wind turbine group; calculating a deviation value of a wind turbine group reactive instruction at the current time point; and updating the wind turbine group reactive instruction on the basis of the acquired, determined, and calculated data so as to perform reactive power control.