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August 2017

IEEE CAES/C&SP – Graham Weinberg – Radar Detection Theory of Sliding Window Processes

August 17 @ 4:10 pm - 5:00 pm
S112, Engineering South,

Abstract Sliding window decision rules are suboptimal non-coherent detectors designed to regulate the false alarm rate while introducing a loss relative to optimal Neyman-Pearson decision rules. In earlier low-resolution radars these detectors were very popular and during the 1960s were investigated extensively. However, with the systematic improvements in radar resolution such detectors became difficult to design so that they achieved  the full constant false alarm rate (CFAR) property. This is primarily a result of the evolution in radar clutter models.…

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Yik Ling Lim – Methods and Verification of Loss Breakdown in an AC Brushless PM Soft Magnetic Composite Machine

August 24 @ 4:10 pm - 4:35 pm
S112, Engineering South,

Abstract Improving the efficiency and power density of permanent magnet machines has been of growing interest because of the large potential energy and material savings. Accurate and reliable methods of loss separation are required to identify the most significant machine losses to target for reduction in order to increase the efficiency. Machines made with stators of soft magnetic composites can offer higher power density. However, in such machines, the proximity of the rotor and stator windings to the end-caps may…

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Menghan Sun – A Fully Integrated Hybrid Power Management Unit for Passive UHF RFID

August 24 @ 4:35 pm - 5:00 pm
S112, Engineering South,

Abstract This paper presents a fully integrated hybrid power management unit (HPMU) realized in the 130 nm process. The design improves the performance of RFID tags—especially those with passively powered sensors—by intelligently managing harvested power. The HPMU opportunistically takes advantage of the excess harvested power beyond the operational requirements of a tag and stores this energy externally. Through smart power routing, this stored energy is used to sustain the supply voltage of tag circuitry during brownouts, cold starts, and for…

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September 2017

Hassan Al-Saadi – Probabilistic Analysis of Maximum Allowable PV Connections across Bidirectional Feeders within a Distribution Network

September 7 @ 4:35 pm - 5:00 pm
S112, Engineering South,

Abstract In the talk,  a probabilistic approach (PA) will be presented to quantify the impacts of PV increase connections in bidirectional feeders within a distribution network. The aim is to establish a tool that can serve distribution network operators (DNOs) in seizing the maximum allowable photovoltaic (PV) connections, and ultimately with their responsibility on providing a reliable and secured power. An uncertainty model based on clearness index is utilized to predict the actual PV power injected in to the utility…

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Gabriel Haines – Wide Speed Range Sensorless Operation of Brushless Permanent-Magnet Motor Using Flux Linkage Increment

September 14 @ 4:35 pm - 5:00 pm
S112, Engineering South,

Abstract: Brushless permanent-magnet (PM) machines offer high efficiency, high-power density, and low maintenance. However, they require the use of an electronic drive to synchronise the current waveforms to the rotor position. Typically, this is achieved through use of external position sensors mounted to the motor shaft. To reduce costs and increase reliability, it is desirable to eliminate these external sensors. Existing back-electromotive force (EMF) and flux linkage-based indirect rotor position detection methods have limitations, specifically poor position accuracy and inability…

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