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Robust SMC-PSS and AVR design: A grid connected solar concentrated OTEC system application
Hussein Abubakr1,2, Abderezak Lashab1, Tarek Hassan Mohamed2
1Centre for Research on Microgrids (CROM), AAU Energy, Aalborg University, Aalborg, Denmark.
Plos One
|December 22, 2023
Summary
This study introduces a new control strategy for offshore solar-concentrated ocean thermal energy conversion (SC-OTEC) systems. The advanced method enhances grid stability and generator damping, improving performance during disturbances.
Area of Science:
- Renewable Energy Systems
- Ocean Thermal Energy Conversion (OTEC)
- Power System Stability and Control
Background:
- Offshore solar-concentrated ocean thermal energy conversion (SC-OTEC) systems are crucial for harnessing ocean temperature differences for electricity generation.
- Existing control methods for SC-OTEC systems exhibit poor coordination, leading to inadequate dynamic stability and damping for synchronous generators (SG).
- Challenges include slow adaptation to disturbances and limited compensation capabilities due to complex control constraints and computational demands.
Purpose of the Study:
- To develop and evaluate an advanced control strategy for enhancing the dynamic stability and damping performance of SC-OTEC systems connected to an AC grid.
- To address the limitations of conventional control methods in managing sudden disturbances and ensuring reliable power generation.
Main Methods:
- A hybrid control strategy combining sliding mode control (SMC) and a power system stabilizer (PSS) was implemented.
- An auxiliary secondary automatic voltage regulator (AVR) integrated with a non-linear exciter system was employed for enhanced damping.
- Controller gains were adaptively tuned using a modified whale optimization algorithm incorporating balloon effect modulation.
- Simulations were conducted in MATLAB/Simulink, subjecting the SC-OTEC system to severe faults, solar radiation variations, temperature changes, and load fluctuations.
Main Results:
- The proposed control strategy demonstrated robust performance in maintaining SC-OTEC system stability.
- Effective damping of the synchronous generator was achieved, significantly outperforming conventional methods.
- The system showed resilience and effective compensation capabilities under various simulated disturbance scenarios.
Conclusions:
- The integrated SMC-PSS and secondary AVR control strategy significantly improves the dynamic stability and damping of SC-OTEC systems.
- The adaptive tuning approach using the modified whale optimization algorithm effectively optimizes controller performance.
- The proposed method offers a promising solution for reliable and stable integration of SC-OTEC power into existing grids.
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