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The stability of bus voltage is the main target of DC microgrid operation. DC microgrid including constant power load, distributed generations employed droop control, and resistive load is investigated. The constant power load can reduce system stability margin, and even cause bus voltage oscillating. The droop control can share the current among different distributed generations, but it can result...
The dark side of Moore's Law is our society's insatiable need to constantly upgrade our computing devices. The high cost in manufacturing energy, materials and disposal is more worrisome the increasing number of smartphones. Repurposing smartphones for educational purpose is a promising idea and shown success in recent years. Our previous work has shown that although different components in smartphones...
The rapid growth of information technology has led to substantial economic and societal benefits. Unfortunately, rapid improvements in technology has also led to an unsustainable "disposable" model in which devices are replaced in a matter of months. This model is especially problematic in the cell phone area, where over a billion phones are manufactured per year. To mitigate the impact...
The paper analyzed in detail the operation principle, mathematical modes and distinct control manner using synchronous reference frame (SRF) of a three-phase series-parallel double conversion UPS system. The proposed control strategy can make this kind of UPS carry out all of the control goals: sinusoidal input current with unit power factor and sinusoidal output voltage with normal value in the case...
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