Power Oscillation Damping Control Using Phase-Shift Gain Switching
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Solution Overview
Problem
Conventional solutions for damping power oscillation in electric power grids are inefficient and require frequent manual adjustments of configuration parameters, which can be labor-intensive and prone to errors.
Innovation Solution
A method that involves determining the phase shift between filtered voltage and frequency signals in the electric power grid, setting the gain of a power oscillation damping controller based on this determination, and controlling the injection of electric power to dampen power oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional solutions are used for damping power oscillation, then the system can operate, but the damping efficiency is insufficient and manual parameter adjustments are required frequently
Solution Approach 1:
The control system automatically detects power oscillations and adjusts damping parameters without manual intervention. The system monitors voltage and frequency signals, identifies oscillation conditions, and self-adjusts controller gains to maintain optimal damping performance, eliminating the need for frequent manual parameter adjustments
Solution Approach 2:
The system continuously monitors voltage and frequency signals from the power grid, detects oscillation patterns, and uses this feedback to automatically adjust damping controller parameters. The feedback loop enables real-time adaptation to changing grid conditions, improving damping efficiency while reducing manual intervention
2Reliability
If the gain of the power oscillation damping controller is set to be positive or negative based on phase shift determination, then the damping performance is improved, but the system complexity increases
Solution Approach 1:
The control system dynamically adjusts the gain parameter based on real-time phase shift determination between voltage and frequency signals. The system transitions from static parameter settings to dynamic adaptation, where controller gains automatically change in response to oscillation characteristics, improving robustness while managing complexity through algorithmic control
Solution Approach 2:
The system changes control parameters (gain values) based on determined phase shifts between voltage and frequency signals. By automatically adjusting parameters according to oscillation mode detection, the system achieves adaptive damping performance without requiring complex hardware modifications, managing complexity through software-based parameter adaptation
Data Source
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AI summary
A method (400) for damping power oscillation in an electric power grid (102), comprising: performing (403) a procedure for determination of a phase shift between a filtered voltage signal (vfiltered) and a filtered frequency signal (ffiltered); based on the performed procedure, determining (404) which one of the filtered voltage signal (vfiltered) and filtered frequency signal (ffiltered) is leading or lagging in relation to the other one of the filtered voltage signal (vfiltered) and filtered frequency signal (ffiltered); based on the determination of which one of the filtered voltage signal (vfiltered) and filtered frequency signal (ffiltered) is leading or lagging, setting (405) a gain (144) of a power oscillation damping controller (142) to be positive or negative; applying (406) the power oscillation damping controller (142) with the set gain (144) so as to produce an output signal outputted from the power oscillation damping controller (142); and based on the produced output signal, controlling (407) an injection of electric power to the electric power grid (102) so as to dampen power oscillation in the electric power grid (102).