Wind Farm Frequency Support Using Turbine Consistency Factors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wind farms face challenges in stabilizing frequency modulation due to differences in control schemes between grid-following and grid-forming wind turbines, leading to uneven frequency modulation capabilities and potential early turbine shutdowns.
Innovation Solution
A frequency support method that sorts wind turbines, detects real-time grid frequency and rotational speeds, calculates consistency factors for frequency modulation, and controls each turbine to exchange and combine these factors to generate consistent added power through a PI link, ensuring uniform frequency support across the wind farm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a uniform frequency modulation strategy is adopted for all wind turbines, then the control scheme is simple, but wind turbines with weak frequency modulation capability may have excessive output and exit operation early
Solution Approach 1:
The patent introduces a consistency factor that varies locally for each wind turbine based on its specific operating conditions (rotational speed, power output, grid frequency). This allows each turbine to have a customized frequency modulation strategy adapted to its local state rather than applying a uniform global strategy, preventing turbines with weak capability from excessive output.
Solution Approach 2:
The consistency factor is dynamically adjusted in real-time based on changing operating conditions including rotational speed, power output, and grid frequency. This dynamic adaptation allows the frequency modulation strategy to respond to varying turbine states, ensuring that turbines operate within safe limits while maintaining frequency support capability.
2Adaptability or versatility
If grid-following and grid-forming wind turbines use independent frequency modulation strategies, then each turbine type can optimize its own performance, but the overall frequency modulation capability of the wind farm is poor
Solution Approach 1:
The patent merges the frequency modulation strategies of grid-following and grid-forming wind turbines into a unified framework. Both turbine types calculate and exchange consistency factors, enabling coordinated frequency support. The grid-forming turbine's consistency added power is integrated into the active power loop phase angle calculation, creating a harmonized control approach that leverages the strengths of both turbine types.
Solution Approach 2:
The consistency factor serves as an intermediary mechanism that enables coordination between different turbine types. By exchanging consistency factors with adjacent turbines, the system creates a communication bridge that allows grid-following and grid-forming turbines to cooperate in frequency modulation despite their different control schemes.
3Power
If wind turbines release rotor kinetic energy for frequency modulation, then frequency support capability is improved, but the rotor speed deviation increases and may cause stability issues
Solution Approach 1:
The patent implements feedback control through the consistency factor calculation that continuously monitors rotor speed and compares it against reference values. The consistency added power generated through PI links provides corrective feedback to adjust frequency modulation output, ensuring that rotor speed deviations are corrected while maintaining frequency support capability.
Solution Approach 2:
The system calculates consistency factors and generates consistency added power in advance based on predicted frequency deviations. This preliminary action allows wind turbines to prepare appropriate frequency modulation responses before grid frequency events occur, reducing the need for aggressive kinetic energy release that would cause large rotor speed deviations.
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
This method improves the overall frequency modulation capability of the wind farm by ensuring reasonable power distribution and preventing excessive wind turbine output, thereby stabilizing grid frequency and extending turbine operation times.
Implementation Method 1
each wind turbine combines its own consistency factors with the consistency factors of two adjacent wind turbines to generate consistent added power through a PI link
Data Source
AI summary
The disclosure provides a frequency support method, device and wind farm for a wind farm and belongs to the technical field of new energy power generation and grid connection. In the frequency support method, a state that can reflect a frequency modulation capability of a wind turbine is designed, measured, and recorded as a consistency factor of frequency modulation. Each wind turbine is controlled to exchange the consistency factors with two adjacent wind turbines. Each wind turbine combines its own consistency factors with the consistency factors of two adjacent wind turbines to generate consistent added power through a PI link and adjusts real-time frequency modulation output based on the consistency added power. In this way, the states of the wind turbines in the wind farm are similar during the frequency support process, so that a reasonable distribution of frequency support power is achieved.