Distinguished University of Chicago economics professor and Nobel Laureate Lars Peter Hansen spoke about “Uncertainty” in economics to 150 seminar attendees at the Charles F. Knight Executive Education & Conference Center on Tuesday, Oct. 17. Hansen is an expert on “Uncertainty” in economic modeling, which includes how factors like risk, ambiguity, and inherent flaws […]
In this paper, a multi-objective current tracking control strategy (MCTCS) is proposed for a novel multi-function electromagnetic damper (MFED) to balance ride comfort and energy recovery performances. To achieve the integration of vibration isolation and energy recovery functions, a novel versatile electromagnetic damper is designed based on bidirectional current flow between actuators and energy storage devices. The MFED system is installed into a quarter-car model, and the disturbance force of the transmission device is considered. A robust active controller is designed to calculate the ideal current, and a current tracking strategy is designed to track the ideal current. Based on the ideal current tracking methodology, the MCTCS method is proposed to realize the switching between different functions. The MCTCS is designed according to the idea of ride comfort-oriented with energy recovery consideration. A well-Tuned passive suspension and two other control strategies are used to co
Over the last few decades, there has been an increase in power grid blackouts globally. In July 2012, over 700 million people in India were affected by grid blackout; 20 of the 28 Indian states suffered the power outage and this blackout was one of the world’s worst grid outages. Such power grid blackouts have been reported in Brazil (1999), in the USA and Canada (August 2003), in Russia (2005), and many more places. To avoid such power grid blackouts, the load frequency is desired to be constant and any deviation in the frequency will impact the power system’s operation.Power system networks are highly uncertain systems because of the fluctuation in the generation uncertainty in the renewable resources in smart grids. Also the active and reactive power requirement is never constant because of continually varying consumer and industrial load. Hence, additional controls need to be deployed to regulate the frequency and maintain the voltage. Any significant deviations in frequency or