Wind Park Control for PCC Oscillation Damping Coordination
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Solution Overview
Problem
Existing wind turbine control systems face challenges in managing power oscillations at the point of common coupling (PCC) while maintaining the ability to modulate wind turbine power output to counteract mechanical oscillations, often leading to conflicts between individual turbine controllers and network stability requirements.
Innovation Solution
A method involving determining individual power reference offsets from wind turbine controllers, calculating an aggregated power reference offset, and generating individual power oscillation compensation signals to adjust wind turbine power references, minimizing PCC oscillations while allowing independent turbine control algorithms to operate unchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If individual wind turbine controllers modulate power output to counteract mechanical oscillations, then mechanical oscillation damping is improved, but power oscillations at the point of common coupling increase
Solution Approach 1:
The control system is segmented into two hierarchical levels: individual wind turbine controllers handling mechanical oscillation damping, and a central wind park controller managing power oscillation compensation. This segmentation allows each controller to focus on its specific function without interfering with the other, resolving the contradiction between mechanical damping and power stability.
Solution Approach 2:
The central wind park controller acts as an intermediary that receives power reference offsets from individual turbines, aggregates them, determines the total power oscillation compensation signal, and distributes individual compensation signals back to turbines. This intermediary coordinates the actions of individual turbines to achieve overall power oscillation reduction while preserving their mechanical oscillation damping capabilities.
2Stability of the object's composition
If central wind park controller coordinates all turbines to reduce power oscillations, then power stability at PCC is improved, but individual turbine control autonomy is reduced
Solution Approach 1:
The system merges individual turbine control with central park control by combining the power reference offsets from all turbines to determine the total compensation signal. This merging allows the central controller to coordinate power oscillation reduction while respecting the autonomous control algorithms of individual turbines, as each turbine continues to operate its own mechanical oscillation damping independently.
3Object-generated harmful factors
If all wind turbines participate equally in power oscillation compensation, then power oscillation reduction is maximized, but turbines with mechanical oscillation issues are overloaded
Solution Approach 1:
The control system applies local quality by allowing each wind turbine to have different participation levels in power oscillation compensation based on its individual conditions. The central controller can assign different weights or participation factors to each turbine, enabling turbines with mechanical oscillation issues to participate less while turbines in good condition participate more, thus optimizing overall power oscillation reduction while maintaining individual turbine reliability.
Data Source
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AI summary
A method is provided for controlling power oscillations at a point of common coupling (30) in a wind park (200). Individual power reference offsets (56) defining an adjustment to a wind turbine power reference signal (55) for counteracting mechanical oscillations in the respective wind turbines are received from respective wind turbine controllers (50). Based on an aggregated power reference offset, a total power oscillation compensation signal is determined. individual power oscillation compensation signals (62) for adjusting the wind turbine power reference signal (55) of respective wind turbines (10) are determined based on the individual power reference offsets (56) and the total power oscillation compensation signal. These individual power oscillation compensation signals are then sent to the respective wind turbines (10).