Power Grid Corrective Signal Control for Forced Oscillation Damping
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Solution Overview
Problem
Power grids face challenges in managing resonant forced oscillations due to control failures or device failures, which can lead to equipment damage and cascading service disruptions, as existing methods struggle to accurately identify and isolate the source of these oscillations, especially in complex systems where modeling all possible sources is impractical.
Innovation Solution
A system comprising a processing unit with a frequency analyzer, corrective signal controller, and tuner that injects corrective signals into the power grid to mitigate forced oscillations by determining the optimal frequency, amplitude, and phase, allowing for the reduction or elimination of these oscillations without requiring identification or isolation of the source, using control devices like synchronous generators or high-voltage direct current controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional source location methods (SCADA, distributed PMUs, phone calls) are used to identify and isolate problematic components, then the source of oscillations can be localized, but the process is challenging and time-consuming due to resonance effects causing oscillations to spread widely across the power grid
Solution Approach 1:
The patent converts the harmful resonance effect, which causes oscillations to spread widely making source location difficult, into a beneficial feature by using the oscillation characteristics themselves as fingerprints to identify the source. The system measures oscillation characteristics at multiple locations and uses pattern recognition to trace back to the source, turning the problem of widespread oscillation into a solution for precise source identification.
Solution Approach 2:
The system continuously monitors oscillation characteristics across the power grid and uses this feedback to automatically identify and locate the source of forced oscillations. The real-time measurement and analysis of oscillation patterns provides continuous feedback that enables rapid source identification without manual intervention.
2Object-affected harmful factors
If corrective signals are injected to mitigate forced oscillations, then oscillation amplitude can be reduced, but the optimal frequency, amplitude, and phase must be determined to ensure effectiveness
Solution Approach 1:
The system employs self-tuning capability where the corrective signal parameters (frequency, amplitude, phase) are automatically adjusted based on real-time oscillation measurements. The controller monitors the effect of injected corrective signals and autonomously optimizes parameters to achieve maximum mitigation effectiveness without requiring manual intervention or complex external control systems.
Solution Approach 2:
The system dynamically changes control parameters (frequency, amplitude, phase) of the corrective signal based on measured oscillation characteristics. By continuously adjusting these parameters in response to real-time grid conditions, the system optimizes the effectiveness of oscillation mitigation while adapting to changing system states.
Data Source
AI summary
Technologies for controlling forced oscillations in electrical power grids include a processing unit and a phasor measurement unit and a control device coupled to a power grid. The processing unit receives a measurement indicative of active power in the power grid from the phasor measurement unit and determines a frequency of a forced oscillation active in the power grid based on the measurement. The processing unit injects a corrective signal with the control device into the power grid. The processing unit determines a corrective phase and a corrective amplitude in response to injecting the corrective signal. The processing unit continues to inject the corrective signal with the corrective phase and the corrective amplitude. The control device may be a static VAR compensator, a synchronous generator, a static synchronous compensator, a synchronous condenser, an electric storage device, or a solar power plant. Other embodiments are described and claimed.