Wind Power Current Injection Profiles for Grid Fault Compliance
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Solution Overview
Problem
Current renewable energy power plants, particularly wind power plants, face challenges in meeting grid code requirements during faults due to the lack of accurate active and reactive current control, especially when grid conditions change, as existing methods like the K-factor only account for reactive current and do not adapt to new requirements.
Innovation Solution
A method that monitors network parameters and voltage levels to generate current injection profiles during normal operation, allowing renewable energy generators to output current according to a set point at the Point of Interconnection during grid faults, ensuring immediate compliance with grid code requirements by using a voltage function that requires minimal computing resources and can be updated iteratively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wind turbine generators act as autonomous current sources during faults, then fast reaction to fault is achieved, but grid code requirements at Point of Interconnection are not met
Solution Approach 1:
The system pre-calculates and stores current injection profiles during normal operation based on monitored network parameters and voltage levels. When a fault occurs, the pre-calculated profile is immediately applied, achieving both fast reaction and compliance with grid code requirements at the Point of Interconnection.
Solution Approach 2:
The system continuously monitors network parameters and voltage levels at the Point of Interconnection, using this feedback to dynamically adjust and update current injection profiles. This ensures the profiles remain accurate and compliant even when grid conditions change.
2Adaptability or versatility
If K-factor method is used for reactive current control, then reactive current supply is achieved, but active current control and adaptability to new requirements are lacking
Solution Approach 1:
The control system is designed to handle both active and reactive current control using a unified approach. It can generate comprehensive current injection profiles that satisfy various grid code requirements, making the system versatile and adaptable to different operational scenarios and regulatory frameworks.
Solution Approach 2:
The system dynamically adjusts current injection parameters based on monitored voltage levels and network conditions. By changing operational parameters in real-time, the system adapts to varying grid code requirements without requiring complex reconfiguration or additional hardware.
3Measurement precision
If current injection profiles are estimated prior to installation, then initial current supply is achieved, but accuracy and compliance under changing grid conditions deteriorate
Solution Approach 1:
The system continuously monitors network parameters and voltage levels during normal operation, continuously updating and refining current injection profiles. This ongoing process ensures profiles remain accurate and compliant even as grid conditions evolve over time.
Solution Approach 2:
The current injection profiles are dynamic rather than static. The system adapts profiles in real-time based on changing grid conditions, transforming the control approach from a fixed pre-installation estimate to a flexible, continuously optimizing system.
Data Source
AI summary
A method for controlling a renewable energy generator, the renewable energy generator being connected to a Point of Interconnection of an external power grid by a connecting network, wherein the connecting network has an associated impedance level. The method comprising: monitoring at least one parameter of the connecting network and the voltage level at the Point of Interconnection; generating, during normal operating conditions, at least one current injection profile based upon the at least one measured parameter and a predetermined injection profile; and operating the renewable energy generator, during a grid fault, to output current according to the at least one current injection profile, so as to achieve a current set point at the Point of Interconnection.