Wind Converter Feedback Control for Network Oscillation Damping
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Solution Overview
Problem
Current power systems, especially those with increasing renewable energy sources, face insufficient damping of network oscillations, which can lead to unstable operation and mechanical stress on equipment.
Innovation Solution
A control unit for wind power installations and wind farms is introduced, capable of detecting voltage and current fluctuations, using feedback control systems and filtering techniques to modulate reactive and active power, thereby damping network oscillations by adjusting frequency and power draw in neighboring consumers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wind power installations are integrated into electrical supply networks with increasing renewable energy sources, then the quantity of renewable energy production is improved, but the damping of network oscillations deteriorates
Solution Approach 1:
The control unit continuously monitors voltage and current signals from the electrical supply network, detects oscillation characteristics through spectral analysis, and dynamically adjusts reactive and active power output in response to detected oscillations. This closed-loop feedback mechanism enables wind power installations to actively damp network oscillations while maintaining high renewable energy production.
Solution Approach 2:
The control unit dynamically modulates the reactive and active power output of the wind power installation based on real-time detection of network oscillation characteristics. By continuously adapting power output parameters in response to changing network conditions, the system maintains effective oscillation damping across varying operational scenarios while maximizing renewable energy contribution.
2Reliability
If conventional power system stabilizers are used in traditional power stations, then network oscillation damping is improved, but the adaptability to renewable energy sources deteriorates
Solution Approach 1:
The control unit is designed to perform multiple functions: it monitors network voltage and current, performs spectral analysis to detect oscillations, determines oscillation characteristics including frequency and damping ratio, and adjusts both reactive and active power output. This multi-functional control system provides oscillation damping capability across diverse renewable energy applications, replacing the need for application-specific stabilizers.
Solution Approach 2:
The control unit dynamically changes operational parameters including reactive power output, active power output, and modulation frequency based on detected oscillation characteristics. By adapting power output parameters in real-time according to network conditions, the control system achieves effective oscillation damping across various renewable energy source types and network configurations.
3Reliability
If the control unit modulates reactive and active power to damp network oscillations, then network stability is improved, but the device complexity increases
Solution Approach 1:
The control unit combines multiple functions into a single integrated device: voltage and current signal acquisition, spectral analysis for oscillation detection, oscillation characteristic determination, and dual power output control. By merging these previously separate functions into one control unit, the system achieves comprehensive oscillation damping capability while minimizing the number of separate components required.
Solution Approach 2:
The control unit autonomously performs all necessary operations for oscillation damping without external intervention. It automatically detects network oscillations through spectral analysis, determines oscillation characteristics, and adjusts power output parameters in real-time based on detected conditions, enabling the system to self-regulate and maintain network stability independently.
Data Source
AI summary
Provided is a control unit for a converter, in particular of a wind power installation and/or of a wind farm, comprising: an input for receiving a detected voltage and/or a detected current, an input for receiving a voltage set point and/or a current set point, an input for receiving a correction value and a feedback control system which is set up, depending on the detected voltage and/or the detected current and the voltage set point and/or the current set point and the correction value, to produce a reactive power set point for a modulated, preferably amplitude-modulated reactive and/or active power of the converter.