Adaptive Power System Stabilizer With Model-Switching Estimation
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Solution Overview
Problem
Conventional power system stabilizers are ineffective in damping generator rotor angle oscillations across the entire dynamic operating range due to their linear, fixed parameters, especially in power grids with increased dynamic stability challenges from renewable energy sources.
Innovation Solution
An adaptive power system stabilizer (PSS) using a cascaded set of estimators, where a first estimator derives an infinite bus value and external reactance, and a second estimator switches between models to provide dynamic stabilization by adjusting signals to an automatic voltage regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional linear PSS with fixed parameters is used, then device complexity is reduced, but stability across dynamic operating range deteriorates
Solution Approach 1:
The PSS transitions from fixed linear parameters to dynamic adaptive parameters that automatically adjust based on operating conditions. The system uses real-time measurements of generator speed, voltage, and current to continuously update PSS parameters, enabling effective damping across the entire dynamic operating range including transient and steady-state conditions.
Solution Approach 2:
The invention changes the parameters of the PSS from constant values to time-varying adaptive parameters. The PSS gain, time constants, and other critical parameters are continuously modified based on system state measurements, allowing the stabilizer to maintain optimal performance under varying load conditions and system configurations.
2Stability of the object's composition
If adaptive PSS with multiple estimators and models is implemented, then stability across dynamic operating range is improved, but device complexity increases
Solution Approach 1:
The adaptive PSS is segmented into distinct functional modules: a first estimator for infinite bus voltage and reactance estimation, a second estimator for generator internal state estimation, a model selection unit, and a PSS control unit. This modular segmentation allows each component to be optimized independently while working together to achieve overall system stability.
Solution Approach 2:
The estimators serve as intermediary components between the raw sensor measurements and the PSS control actions. The first estimator intermediates by providing accurate infinite bus parameters, while the second estimator intermediates by delivering precise generator internal states, enabling the PSS to make informed control decisions without directly processing raw sensor data.
3Measurement precision
If model switching estimator is used, then measurement precision for generator parameters is improved, but device complexity increases
Solution Approach 1:
The estimator system changes its operational parameters by switching between different mathematical models based on system conditions. The model selection unit monitors operating conditions and adjusts the estimator parameters accordingly, selecting the most appropriate model for the current state to maximize measurement precision while adapting to varying system dynamics.
Data Source
AI summary
A power generation system includes an adaptive power system stabilizer (PSS). The adaptive PSS includes a first estimator configured to receive a plurality of sensor measurements as input and to output a derived infinite bus (TB) value. The adaptive PSS further includes a second estimator disposed downstream of the first estimator and configured to switch between a plurality of models, wherein each of the plurality of models is configured to receive the derived IB value as input and to output a derived electric generator parameter, and wherein the adaptive PSS is configured to use the derived electric generator parameter to provide stabilization of an electric generator.