Adaptive Grid Voltage Control via Impedance Gain
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Solution Overview
Problem
Existing grid voltage control methods for wind power plants struggle to meet strict grid code demands, particularly in weak or isolated power grids, due to limitations in dynamic response and voltage stability.
Innovation Solution
A method for adaptive grid voltage control that involves calculating and injecting active or reactive power into the grid based on real-time short circuit impedance measurements, allowing for dynamic adjustment of the voltage controller's gain parameter to match grid conditions, thereby ensuring stable voltage levels and compliance with strict grid codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed gain voltage control is used, then control simplicity is maintained, but adaptability to varying grid conditions deteriorates
Solution Approach 1:
The voltage controller uses dynamic gain adjustment based on real-time short circuit impedance measurements. The gain parameter is continuously updated according to grid conditions, transforming a static control system into a dynamic one that adapts to varying impedance levels while maintaining operational simplicity through automated feedback control
Solution Approach 2:
The system implements feedback control by measuring short circuit impedance at the point of common coupling and using this information to adjust the voltage controller gain. This closed-loop feedback mechanism enables automatic adaptation to grid condition changes without requiring complex manual intervention or reconfiguration
2Speed
If voltage control is implemented without adaptive gain adjustment, then control system simplicity is maintained, but dynamic response performance deteriorates
Solution Approach 1:
The controller dynamically adjusts its gain parameter in real-time based on measured short circuit impedance variations. This dynamic adaptation enables fast response to grid condition changes and voltage disturbances, achieving superior dynamic performance compared to fixed gain controllers while keeping the implementation straightforward through automated measurement and adjustment
3Reliability
If standard voltage control methods are used, then compliance with basic grid codes is achieved, but performance under strict grid code demands deteriorates
Solution Approach 1:
The system changes the gain parameter of the voltage controller based on measured short circuit impedance values. By adjusting this critical control parameter according to actual grid conditions, the system achieves reliable compliance with strict grid code demands across varying operating scenarios, transforming a one-size-fits-all approach into a condition-specific adaptive control strategy
Data Source
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AI summary
The present invention relates to a method for controlling a voltage level of a power supply grid operationally connected to a source of electrical power, the method comprising the steps of determining a short circuit impedance of the power supply grid at a point of common coupling, calculating, using the determined short circuit impedance, a gain value of the power supply grid, and controlling the grid voltage level in accordance with the calculated gain value by applying said gain value as a gain parameter in a voltage controller. The method according to the present invention may be implemented as a method for configuring a voltage controller once and for all, or it may be implemented as a method for adaptively adjusting a gain of a voltage controller.