Adaptive Grid Voltage Control Using Short-Circuit Impedance
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Solution Overview
Problem
Wind power plants face challenges in meeting strict grid code demands due to variations in grid voltage levels, particularly in weak or isolated power grids, where existing control methods are inadequate in providing adaptive and efficient voltage control.
Innovation Solution
A method that determines the short circuit impedance of the power supply grid at the point of common coupling to calculate gain values for a voltage controller, allowing for adaptive control of grid voltage by varying active or reactive power injection, ensuring minimal voltage overshoot and dynamic response independent of grid configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing control methods are used in weak or isolated power grids, then the system structure is simple, but the voltage control performance is inadequate and cannot meet strict grid code demands
Solution Approach 1:
The patent changes the control parameter from fixed gain to adaptive gain that varies with grid conditions. The voltage controller adjusts its gain parameter based on real-time grid voltage measurements and predefined thresholds, allowing the system to adapt to varying grid strength and maintain optimal control performance across different operating conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the voltage controller continuously monitors grid voltage levels and adjusts the active power injection accordingly. The controller compares measured voltage with reference values and modifies the gain parameter based on voltage deviations, creating a closed-loop control system that responds dynamically to grid conditions.
2Reliability
If adaptive voltage control is implemented to meet strict grid code demands, then voltage control performance improves, but the control system complexity increases
Solution Approach 1:
The patent makes the controller dynamic by allowing the gain parameter to change in real-time based on grid conditions. Instead of a static controller, the system continuously adapts its characteristics according to the measured voltage levels and grid strength, enabling the controller to maintain optimal performance across varying operating conditions without requiring complex reconfiguration.
3Adaptability or versatility
If the gain parameter is adjusted frequently to match grid characteristics, then the adaptability to grid conditions improves, but the response time and control stability may be affected
Solution Approach 1:
The patent employs periodic action by adjusting the gain parameter at specific voltage threshold levels rather than continuously. The controller monitors voltage deviations and adjusts the gain parameter in discrete steps when voltage thresholds are crossed, providing regular adaptation to grid conditions while maintaining control stability through structured, threshold-based parameter changes.
Data Source
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.