Virtual Measured Voltage for Wind Farm Grid Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wind farms feeding electric power into a supply grid can destabilize the grid when their control systems interact, leading to potential vibration behavior and instability, especially when multiple decentralized generators attempt to stabilize the grid simultaneously.
Innovation Solution
A method involving a wind farm that feeds power into the grid through a transformer using a virtual measured voltage, calculated based on the topology and measured values, which allows for partial decoupling of actual voltage measurement and prevents conflicting voltage control between wind farms, thereby increasing grid stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wind farms feed power into the supply grid simultaneously, then the total power generation increases, but the grid stability deteriorates due to conflicting control actions and measurement errors
Solution Approach 1:
The patent introduces a virtual measurement point as an intermediary between the actual measurement point and the control systems of multiple wind farms. This virtual point acts as a mediator that provides a common reference voltage for all wind farms, preventing them from working against each other by using different actual measurement points. The virtual measurement point decouples the control actions of individual wind farms from the physical measurement uncertainties, thereby maintaining grid stability while allowing multiple farms to operate simultaneously.
2Ease of operation
If wind farms use actual measured voltage for feeding power, then the control is simple and direct, but measurement errors cause conflicting control actions that destabilize the grid
Solution Approach 1:
The patent creates a virtual copy of the measurement point that replicates the essential function of voltage measurement without the errors of physical measurements. This virtual measurement point provides a consistent reference voltage that all wind farms use for their control systems. By copying the measurement function in a virtual rather than physical form, the system maintains control simplicity while eliminating the reliability issues caused by measurement errors and I-term controller conflicts.
3Productivity
If wind farms are located at different positions in the grid, then the power distribution is optimized, but the voltage measurements at different locations cause conflicts in voltage control
Solution Approach 1:
The patent merges the voltage reference function for all wind farms into a single virtual measurement point, even though the wind farms are physically distributed at different locations. This consolidation allows each wind farm to maintain its optimized power distribution while all farms reference the same virtual voltage. The merging of the measurement reference function eliminates the need for complex coordination between distributed measurements, simplifying voltage control while preserving distribution efficiency.
Data Source
AI summary
Method for feeding electric power into an electric supply grid by means of a wind farm, wherein the wind farm feeds into the supply grid from an interconnecting network and via a transformer, with the first interconnecting network having a interconnecting network voltage and the supply grid having a grid voltage, wherein feeding takes place based on a virtual measured voltage and a voltage of a virtual measurement point is calculated as the virtual measured voltage.