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Sustained power frequency overvoltage control strategy is an important part of power system restoration plan. The existing sustained overvoltage control methods are based on static network, ignoring the dynamic restoration process. By choosing restoration targets as milestones, the dynamic process can be divided into several restoration sequences, each sequence consists of several restoration operations...
A novel gate-all-around ultra-thin p-channel poly-Si TFT functioning as transistor and flash memory with silicon nanocrystals have been successfully demonstrated. The process is simple and mask free. For the 3-nm-thick channel devices, the S.S. of 88 mV/dec and Ion/Ioff ratio of more than 108 can be achieved. Extreme low applied voltage for band-to-band-tunneling-induced hot electron injection tunneling...
Voltage-dependent timing skews in precharge and sensing activities cause functional failure and reduce the speed of asynchronous SRAM. Data-dependent bitline leakage current further increases the timing skews and reduces the yield of asynchronous SRAM. A dual-mode self-timed (DMST) technique is developed for asynchronous SRAM to eliminate the timing-skew-induced failures and speed overhead across...
The minimally invasive inspection based on medical MEMS has been in clinical use since the Israel invention of a passive capsule endoscope, M2A, followed by similar capsule endoscopes made in Japan and Korea. Due to the need of external control, active medical MEMS containing autonomous locomotion started to appear with power cable connections to replace in sufficient batteries. Unfortunately, power...
This paper proposes a new practical modular power converter, combining with the new power electronics technologies: the emerging emitter turn-off (ETO) thyristor device, modular voltage source converter and digital control technology. A modularized ETO based power converter with digital local controller is designed and developed. Comparing with the conventional power converter, the proposed power...
Operation of today's very large scale and interconnected electric power systems depends critically on the devices that facilitate management of power flow on the grid. These devices can be based on passive components such as capacitor and inductor, or rely on the solid state power electronics technology to achieve much faster control bandwidth. Widely known as FACTS (Flexible AC Transmission system)...
Emitter turn-off (ETO) thyristor based static synchronous compensator (STATCOM) is one of the promising flexible AC transmission system (FACTS) technologies, and it is gaining more popularity in utility grids. A 4.5 MVA ETO based STATCOM failed two ETO devices as over-voltage protection triggered AC connector and disconnected the STATCOM from AC grid supply. This paper presents the investigation of...
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