Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in ... more Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. Traditionally, power system stabilizers (PSS) are being used to damp these oscillations. Unified Power Flow Controller (UPFC) is a well-known FACTS device that can control power flow in transmission lines. It can also replace PSS to damp low frequency oscillations effectively through direct control of voltage and power. In this paper a liberalized Philips-Heffron model of a (Single Machine-Infinite Bus) power system with a unified power flow controller is considered and also in order to damp LFO, adaptive neuro-fuzzy controller for UPFC is designed and simulated. Simulation is performed for various types of loads and for different disturbances. Simulation results show good performance of neuro-fuzzy controller in damping LFO. Keywords- Neuro-Fuzzy Controller, Low Frequency,Oscillations (LFO...
Project Abstract (Brief Description): The maritime and multimodal system is an integral part to t... more Project Abstract (Brief Description): The maritime and multimodal system is an integral part to the efficient movement of the nation’s freight, which includes around 25,000 miles of commercially navigable harbors, channels, and waterways, 4 million miles of public highways and roads, and over 140,000 miles of national, regional, and local railroad networks. Slopes and embankments are one of the major components of the maritime and multimodal transportation infrastructure, which often subjected to shallow landslides due to the existence of expansive clay soil. In Mississippi, the shallow slope failure is induced by the climatic (temperature and rainfall) variation that cause shrink-swell behavior of expansive Yazoo clay soil, and require significant budget to repair. As a cost effective alternative, Recycled Plastic Pins (RPP) can be utilized to stabilize shallow slope failures, to offer a sustainable option and increase the economic competitiveness to maintain multimodal transportat...
Expansive Yazoo clay soil is susceptible to volumetric deformation and is dominant in central Mis... more Expansive Yazoo clay soil is susceptible to volumetric deformation and is dominant in central Mississippi and other neighboring southern states of the United States. Recurring shrink-swell behavior causes a significant problem to infrastructures in the area. Although Yazoo clay causes a significant problem in the deep southern states, limited study has been conducted on the behavior of Yazoo clay, especially in the presence of rainfall. The objective of this current study is to investigate the coupled effect of changes in void ratio due to wet-dry cycles and rainfall on the stability of highway slopes made of Yazoo clay. The finite element method in Plaxis 2D by Bentley System (https://www.plaxis.com/) has been utilized to investigate the coupled effect of changes in mechanical properties and rainfall using flow-deformation and stability analysis. Reconstituted expansive clay soil samples were used for the laboratory experiment. The reconstituted Yazoo clay samples were subjected to...
Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in ... more Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. Traditionally, power system stabilizers (PSS) are being used to damp these oscillations. Unified Power Flow Controller (UPFC) is a well-known FACTS device that can control power flow in transmission lines. It can also replace PSS to damp low frequency oscillations effectively through direct control of voltage and power. In this paper a liberalized Philips-Heffron model of a (Single Machine-Infinite Bus) power system with a unified power flow controller is considered and also in order to damp LFO, adaptive neuro-fuzzy controller for UPFC is designed and simulated. Simulation is performed for various types of loads and for different disturbances. Simulation results show good performance of neuro-fuzzy controller in damping LFO. Keywords- Neuro-Fuzzy Controller, Low Frequency,Oscillations (LFO...
Project Abstract (Brief Description): The maritime and multimodal system is an integral part to t... more Project Abstract (Brief Description): The maritime and multimodal system is an integral part to the efficient movement of the nation’s freight, which includes around 25,000 miles of commercially navigable harbors, channels, and waterways, 4 million miles of public highways and roads, and over 140,000 miles of national, regional, and local railroad networks. Slopes and embankments are one of the major components of the maritime and multimodal transportation infrastructure, which often subjected to shallow landslides due to the existence of expansive clay soil. In Mississippi, the shallow slope failure is induced by the climatic (temperature and rainfall) variation that cause shrink-swell behavior of expansive Yazoo clay soil, and require significant budget to repair. As a cost effective alternative, Recycled Plastic Pins (RPP) can be utilized to stabilize shallow slope failures, to offer a sustainable option and increase the economic competitiveness to maintain multimodal transportat...
Expansive Yazoo clay soil is susceptible to volumetric deformation and is dominant in central Mis... more Expansive Yazoo clay soil is susceptible to volumetric deformation and is dominant in central Mississippi and other neighboring southern states of the United States. Recurring shrink-swell behavior causes a significant problem to infrastructures in the area. Although Yazoo clay causes a significant problem in the deep southern states, limited study has been conducted on the behavior of Yazoo clay, especially in the presence of rainfall. The objective of this current study is to investigate the coupled effect of changes in void ratio due to wet-dry cycles and rainfall on the stability of highway slopes made of Yazoo clay. The finite element method in Plaxis 2D by Bentley System (https://www.plaxis.com/) has been utilized to investigate the coupled effect of changes in mechanical properties and rainfall using flow-deformation and stability analysis. Reconstituted expansive clay soil samples were used for the laboratory experiment. The reconstituted Yazoo clay samples were subjected to...
Uploads
Papers by Sadik Khan