In the heart of Iran, researchers at the Faculty of Engineering, University of Urmia, are tackling a critical challenge in the renewable energy sector. Led by Hossein Hosseini, a team of engineers has been delving into the complexities of sub-synchronous resonance (SSR) in power systems that integrate wind and steam turbines. Their findings, published in the Majlesi Journal of Electrical Engineering (also known as the Journal of Electrical Engineering), offer a glimpse into the future of stable and efficient hybrid energy systems.
SSR is a well-known phenomenon in series-compensated power systems, where electrical oscillations can cause significant damage to equipment. As wind power systems become more prevalent, the impact of wind generators on SSR has become increasingly important. “The growing requirement for clean and renewable energy has led to the rapid development of wind power systems all over the world,” Hosseini explains. “With this increase, the impact of wind generators on sub-synchronous resonance is becoming more critical.”
To mitigate SSR, Hosseini and his team explored the use of flexible AC transmission systems (FACTS) devices. They focused on two types of FACTS controllers: the thyristor-controlled series capacitor (TCSC) and the unified power flow controller (UPFC). These devices are designed to dampen SSR and ensure the stability of the power system.
The researchers also introduced a novel method using the imperialist competitive algorithm (ICA) to optimize the pitch angle control in high wind speeds. This approach, combined with supplementary controllers designed for UPFC and TCSC, incorporates adaptive neuro-fuzzy inference systems (ANFIS) and fuzzy logic damping controllers (FLDC). These advanced control strategies aim to enhance the performance of FACTS devices in mitigating SSR.
The results of their study show promising outcomes. The comparison between the two FACTS devices revealed that both TCSC and UPFC can effectively dampen SSR, but the UPFC, with its series-parallel capabilities, offers more comprehensive control. Additionally, the ICA method was compared with a PID controller optimized by the Particle Swarm Optimization (PSO) algorithm, highlighting the efficiency and effectiveness of the ICA approach.
This research has significant commercial implications for the energy sector. As the world transitions towards cleaner energy sources, the integration of wind and steam turbines in hybrid systems is becoming more common. The ability to mitigate SSR using advanced FACTS controllers and optimization algorithms ensures that these systems can operate safely and efficiently. This not only reduces the risk of equipment damage but also enhances the overall reliability and stability of the power grid.
The findings from Hosseini’s team at the University of Urmia could shape future developments in the field. By providing a robust framework for SSR mitigation, this research paves the way for more innovative solutions in power system stability. As the energy sector continues to evolve, the integration of advanced control strategies and FACTS devices will be crucial in achieving a sustainable and resilient energy infrastructure.
