Self-Tuning Power System Stabilizer for Low-Frequency Oscillations
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Solution Overview
Problem
Traditional power system stabilizers (PSS) require offline studies and frequent recalibration, which can lead to system downtime and are ineffective in detecting and mitigating oscillations outside their tuned frequency range, particularly those below 1 Hertz, posing a risk of system instability and collapse.
Innovation Solution
A self-tuning power system stabilizer system that uses a self-tuning computing device to detect oscillations and dynamically adjust gain and time constant settings in real-time, allowing the automatic voltage regulator to adjust its pulse output voltage to counteract oscillations across a wide range of frequencies, including those below 1 Hertz, without requiring system downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional offline studies are used to derive PSS settings, then the settings are optimized for specific operating points, but the system requires downtime and cannot adapt to changing oscillation modes
Solution Approach 1:
The patent implements a self-tuning PSS system that dynamically adjusts lead-lag filter settings and gain values in real-time based on detected oscillation modes. The system continuously monitors power system oscillations and automatically retunes the PSS parameters without requiring system shutdown, thereby maintaining manufacturing precision while eliminating downtime associated with traditional offline studies
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by automatically detecting oscillation modes and retuning PSS parameters without external intervention. The self-tuning capability allows the PSS to service itself, eliminating the need for manual recalibration and maintaining optimal performance across varying operating conditions
2Manufacturing precision
If lead lag filters are tuned to fixed oscillation frequency, then the PSS provides damping for that specific frequency, but it cannot detect or mitigate oscillations outside its tuned range
Solution Approach 1:
The patent employs adaptive lead-lag filters whose center frequencies and bandwidths are dynamically adjusted based on real-time oscillation detection. The system can track and respond to multiple oscillation modes across a wide frequency spectrum, maintaining precise damping for each detected mode while expanding the overall frequency range coverage
Solution Approach 2:
The self-tuning PSS system is designed to handle multiple oscillation modes simultaneously by adapting its filter characteristics. The universal design allows the same PSS apparatus to effectively damp inter-area modes, intra-area modes, local modes, and intra-plant modes across different frequency ranges, rather than requiring separate tuned systems for each mode
3Measurement precision
If traditional PSS systems are used, then they can detect oscillations within their tuned range, but they fail to detect oscillations below 1 Hertz
Solution Approach 1:
The patent modifies the detection parameters of the PSS system by implementing adaptive filtering and signal processing techniques that are sensitive to low-frequency oscillations. The system adjusts its detection bandwidth and threshold parameters to effectively capture and analyze oscillations below 1 Hz, thereby extending measurement precision to previously undetectable frequency ranges
Data Source
AI summary
A system for controlling a power system is provided. The system includes an automatic voltage regulator configured to transmit a pulse output voltage, a power system stabilizer in communication with the automatic voltage regulator, and a self-tuning computing device. The self-tuning computing device is programmed to: a) receive a plurality of sensor information of operation of a generator; b) detect an oscillation during the operation of the generator from the plurality of sensor information; c) determine a gain and a time constant to counteract the oscillation; and d) transmit, to the power system stabilizer, the gain and the time constant. The power system stabilizer is configured to instruct the automatic voltage regulator to adjust its pulse output voltage based on the gain and the time constant.