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Model based PI power system stabilizer design for damping low frequency oscillations in power systems
Aprajita Salgotra1, Somnath Pan1
1Department of Electrical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
ISA Transactions
|March 31, 2018
Summary
This study introduces a two-level control strategy using local and centralized controllers to stabilize low-frequency oscillations in power systems. The new proportional-integral power system stabilizer (PI-PSS) significantly improves system damping and stability.
Area of Science:
- Electrical Engineering
- Control Systems Engineering
Background:
- Low-frequency oscillations pose significant challenges to power system stability.
- Existing control strategies may not adequately address both local modes and inter-subsystem performance.
Purpose of the Study:
- To develop and evaluate a two-level control strategy for mitigating low-frequency oscillations in power systems.
- To design a proportional-integral power system stabilizer (PI-PSS) using a frequency domain direct synthesis method.
Main Methods:
- A hybrid control approach combining local and centralized controllers.
- Design of PI-PSS using a reference model-based frequency domain direct synthesis.
- Validation on one-machine infinite bus and multi-machine power system models.
Main Results:
- The proposed PI-PSS effectively stabilizes local modes and minimizes inter-connection effects.
- Significant improvements in system damping were observed, with damping factors increasing substantially (e.g., from 0.0217 to 0.666).
- Unstable system operations were stabilized, demonstrating the controller's robustness.
Conclusions:
- The two-level control strategy, particularly with the proposed PI-PSS, offers a robust and effective solution for damping power system oscillations.
- The frequency domain synthesis method provides a straightforward approach for designing effective PI-PSS controllers.
- Simulation results confirm the superiority of the proposed method compared to existing controllers.
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