in emerging electric power systems, increased transactions often lead to the situations where the system no longer remains in secure operating region. the flexible ac transmission system (facts) controllers can play an important role in the power system security enhancement. however, due to high capital investment, it is necessary to locate these controllers optimally in the power system. facts...

When power systems are expanded and connected together with weak tie lines, the low-frequency oscillations are increased and the stability margin of the power system decreases. Therefore, when designing the transmission system to be used, it is necessary to maintain the dynamic stability of the power system, and to make sure to have the most possible stability margin. SSSC is a FACTS device con...

As illustrated in recent years (Superstorm Sandy, the Northeast Ice Storm of 1998, etc.), extreme weather events pose an enormous threat to the electric power transmission systems and the associated socio-economic systems that depend on reliable delivery of electric power. Besides inevitable malfunction of power grid components, deliberate malicious attacks can cause high risks to the service. ...

Visualization of macro-vessels is difficult using existing contrast agent imaging methods without blooming or other artifacts. Early use of standard color flow equipment led to saturation and blooming, obscuring small vasculature. More recently, low Mechanical Index (MI<0.15) harmonic techniques have been devised to visualize nearly stationary microbubbles in the microcirculation in real time (...

Notice Concerning Copyright Material PSERC members are given permission to copy without fee all or part of this publication for internal use if appropriate attribution is given to this document as the source material. This report is available for downloading from the PSERC website. DOE CERTS program. We also thank the many industrial advisors who helped to contribute to the success of this proj...

An overview of recent progress in the research and development of microelectromechanical devices for use in wireless communication sub-systems is presented. Among the specific devices described are tunable micromachined capacitors, integrated high-Q inductors, and micro-scale vibrating mechanical resonators with Q’s in the tens of thousands. Specific applications are reviewed for each of these ...