Adaptive Damping Controller for Power System Oscillation Modes
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Solution Overview
Problem
Existing power system stabilizers and FACTS devices face challenges in accurately damping power oscillations due to the complexity of large interconnected systems and the need for adaptive control in changing operating conditions, leading to instability and potential blackouts.
Innovation Solution
A system and method utilizing a damping device controller with adaptive controllers to generate control signals that shift open-loop poles to closed-loop locations, compensating for multiple oscillation modes in power systems, employing online estimation and pole-shifting algorithms to damp power oscillations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If classical control theory with accurate system models is used for power system stabilization, then control precision is improved, but device complexity increases due to the need for accurate modeling of large interconnected systems at particular operating conditions
Solution Approach 1:
The controller performs self-identification of system modes and adaptive parameter tuning without requiring external system models. The microprocessor automatically identifies oscillation modes, estimates system parameters, and adjusts controller gains in real-time based on measured system behavior, eliminating the need for complex pre-established accurate system models
Solution Approach 2:
The controller dynamically changes its operating parameters (gains and mode frequencies) based on real-time system conditions. By continuously adapting controller parameters to match current system operating states, the controller maintains high precision across varying conditions without requiring multiple fixed models for different operating points
2Adaptability or versatility
If indirect adaptive controllers with online estimation are used to adapt to changing operating conditions, then adaptability is improved, but device complexity increases due to complex multi-input multi-output structure
Solution Approach 1:
The controller segments the complex MIMO control problem into multiple independent SISO (single-input single-output) control channels, each targeting a specific oscillation mode. By designing separate controllers for different oscillation modes rather than a single complex multivariable controller, the system achieves adaptability to changing conditions while significantly reducing overall controller complexity
Solution Approach 2:
The controller dynamically adjusts its behavior by continuously identifying current system modes and reconfiguring control parameters in real-time. The controller transitions from static gain schedules to dynamic parameter adaptation, allowing it to follow system mode changes and maintain effectiveness under varying operating conditions without requiring complex fixed MIMO structures
3Measurement precision
If model-based approaches are used for power oscillation damping, then control precision is improved, but ease of operation worsens due to lack of accurate and updated information about dynamic components
Solution Approach 1:
The controller implements continuous feedback through real-time measurement of system oscillations and automatic updating of system model parameters. By constantly monitoring system behavior and using this feedback to update its internal model and control parameters, the controller maintains high precision without requiring manual model updates or external information about system component changes
Data Source
AI summary
A system for damping power system oscillation includes a damping device controller for generating a damping control signal to compensate for a plurality of oscillation modes in the power system oscillations and a damping device to generate a damping signal based on a damping control signal. The damping device controller includes a plurality of outer closed loop paths each including an adaptive controller configured to determine an individual oscillation mode from at least one power system measurement signal. Each adaptive controller is further configured to generate an adaptive control signal to shift at least one open loop pole of an inner loop path related to the individual oscillation mode to a closed loop location.