Grid Oscillation Damping via Phase-Shift Gain Control

Solution Overview

Problem

Conventional methods for damping power oscillations in electric power grids are inefficient and require frequent manual adjustments of configuration parameters, leading to instability and increased operational burdens for transmission system operators.

Innovation Solution

A method that determines the phase shift between filtered voltage and frequency signals to set the gain of a power oscillation damping controller, allowing for automatic control of electric power injection to dampen oscillations, reducing the need for manual adjustments and improving damping efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional methods are used for damping power oscillations, then power oscillation damping support is provided to the electric power grid, but the damping efficiency is insufficient and frequent manual adjustments of configuration parameters are required

Engineering Contradiction:

Improvedamping efficiencyVSAvoidmanual parameter adjustments

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The control arrangement automatically determines the phase shift between voltage and frequency signals and adjusts the gain parameter accordingly without requiring manual intervention. The system monitors the phase relationship in real-time and self-adjusts the damping controller gain to maintain optimal damping performance, eliminating the need for frequent manual parameter adjustments by transmission system operators

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system continuously monitors the phase shift between voltage and frequency signals and uses this feedback information to dynamically adjust the gain parameter of the power oscillation damping controller. This closed-loop feedback mechanism ensures that the damping efficiency is maintained at optimal levels by automatically responding to changes in grid conditions

Inventive Principle:

Principle #23Feedback

2Reliability

If the gain of power oscillation damping controller is not properly adjusted, then manual parameter adjustments are required, but the robustness of the controller is reduced

Engineering Contradiction:

Improvecontroller robustnessVSAvoidautomatic gain adjustment

Core Design Contradiction:

ReliabilityVSExtent of automation

Solution Approach 1:

The control arrangement automatically determines the phase shift between voltage and frequency signals and adjusts the gain parameter accordingly without requiring manual intervention. The system monitors the phase relationship in real-time and self-adjusts the damping controller gain to maintain optimal damping performance, eliminating the need for frequent manual parameter adjustments by transmission system operators

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system dynamically changes the gain parameter of the power oscillation damping controller based on the determined phase shift between voltage and frequency signals. By automatically adjusting this critical parameter, the system maintains optimal controller robustness and damping performance under varying grid conditions without manual intervention

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12261439B1Method for damping power oscillation in an electric power grid

Publication Date: 2025.03.25 VESTAS WIND SYSTEMS AS

AI summary

A method for damping power oscillation in an electric power grid, comprising: performing a procedure for determination of a phase shift between a filtered voltage signal and a filtered frequency signal; based on the performed procedure, determining which one of the filtered voltage signal and filtered frequency signal is leading or lagging in relation to the other one of the filtered voltage signal and filtered frequency signal; based on the determination of which one of the filtered voltage signal and filtered frequency signal is leading or lagging, setting a gain of a power oscillation damping controller to be positive or negative; applying the power oscillation damping controller with the set gain so as to produce an output signal outputted from the power oscillation damping controller; and based on the produced output signal, controlling an injection of electric power to the grid so as to dampen power oscillation in the grid.