Wind Farm Reactive Power Balancing With Individual Voltage Setpoints
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Solution Overview
Problem
Existing methods for distributing reactive power among wind power installations in a wind farm often result in imbalances due to varying sizes and power generation levels, leading to inappropriate distribution and voltage differences across installations, which can affect grid stability.
Innovation Solution
A method for controlling reactive power in a wind farm by setting a farm reactive power setpoint and determining individual installation control setpoints based on a common voltage setpoint and individual installation reactive power, using controllers to adjust reactive current and voltage differences to achieve balanced reactive power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If reactive power is distributed evenly across all wind power installations, then the control is simple, but the distribution becomes inappropriate when installations have different sizes or power generation levels
Solution Approach 1:
The patent applies local quality by assigning different control parameters (voltage setpoints) to different wind power installations based on their individual characteristics such as size, power generation level, and connection line length. This allows each installation to contribute appropriately to the total reactive power while maintaining uniform voltage across the farm.
2Productivity
If reactive power distribution is adjusted based on nominal power or generated power percentages, then the total reactive power target can be reached, but constant fluctuations occur in the distribution process
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual voltage at each wind power installation and adjusting the voltage setpoints accordingly. This feedback mechanism eliminates constant fluctuations in reactive power distribution while ensuring the total reactive power target is consistently achieved.
Solution Approach 2:
The patent applies equipotentiality by controlling the voltage at each wind power installation to be equal to a common reference voltage. This approach stabilizes the reactive power distribution by eliminating voltage differences that cause fluctuations, while still allowing each installation to contribute according to its capacity.
3Device complexity
If a common farm voltage setpoint is used for all wind power installations, then the control is simplified, but voltage differences and reactive power imbalances occur due to asymmetries and differing connection line lengths
Solution Approach 1:
The patent resolves this contradiction by applying local quality - while maintaining a common control framework, it assigns individualized voltage setpoints to each wind power installation based on its specific electrical characteristics. This approach achieves voltage uniformity across the farm without requiring complex installation-by-installation control systems.
Data Source
AI summary
The disclosure relates to a method for providing a farm reactive power by way of a wind farm containing multiple wind power installations, comprising the steps of receiving a farm target value, which characterizes or influences a farm reactive power, used to specify a reactive power to be fed in by the wind farm, determining a farm control setpoint as a common target value for all wind power installations as a function of the farm target value, determining an individual installation control setpoint in each case for one of the wind power installations as a function of the farm control setpoint, determining and outputting an individual installation reactive power or an individual reactive current in each case by way of one of the wind power installations as a function of an installation voltage difference in the form of a difference between an installation actual voltage and an individual installation voltage setpoint of the respective wind power installation, where the individual installation voltage setpoint is determined from the individual installation control setpoint of the respective wind power installation, or corresponds to the individual installation control setpoint, and where the individual installation control setpoint is determined in each case as a function of the individual installation reactive power of the respective wind power installation and as a function of multiple, in particular all individual installation reactive powers of the wind power installations of the wind farm.