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Exploring Converter Control Duality in Microgrids: AC Grid-Forming vs DC Droop Control
Announce Type: replace Abstract: Power electronic converters are fundamental building blocks of both AC and DC microgrids, enabling the integration of renewable energy sources, energy storage systems, electronic loads, and electric vehicles. In contrast, converter control in DC microgrids has developed along the path of droop control, which is widely adopted for decentralized DC-bus voltage regulation and power sharing. Although these control strategies share certain characteristics, their...
Impedance Modeling and Stability Analysis of Droop-Controlled Inverter Under Unbalanced Power Grid Operating Conditions
Announce Type: new Abstract: With the growing integration of renewable energy sources into power grids, the risks of oscillation caused by interactions between grid-tied inverters and the grids are becoming increasingly prominent. Although existing studies have made significant progress in inverter modeling and oscillatory stability analysis, most of them do not sufficiently consider complex mirror frequency coupling effects (MFCE) under unbalanced operating conditions, leading to unreliable...
Seamless Contraction-Control Framework for Unplanned Grid-Connected/Stand-Alone Transitions of Grid-Forming Inverters
Announce Type: new Abstract: Unplanned grid-connected (GC)/stand-alone (SA) transitions commonly occur in AC microgrids during protection trips, manual breaker operation, or low-bandwidth supervisory communication. Under such unplanned transitions, a grid-forming inverter must support the local-load voltage in stand-alone operation and regulate the desired power/current injection in grid-connected operation. Existing P--Q droop-based seamless-transfer methods often rely on planned transition...
Delhi fire tragedy: In Hauz Rani, residents rely on ‘themselves, neighbours’ as fears linger
As one enters Hauz Rani in South Delhi, the aftermath of a tragedy still hangs heavy over the narrow lanes where a massive fire at Flourish Stay B&B claimed 21 lives. The bylanes are tight, almost claustrophobic, with homes pressing in from both sides, making navigation difficult even on foot. Overhead, a dense web of tangled electrical and communication wires stretches across the locality—drooping, overlapping and hanging dangerously close to rooftops.
Houseplant hacks: does talking to your plants help them grow?
The theory is that breathing near your plants releases carbon dioxide, boosting photosynthesis and growthThe problem We’ve all done it. Walked past a drooping fern, crouched down and given it a few encouraging words (whether you admit it to other people is a different matter). We are told it’s actually good for our plants, so should we all be chatting away to them to help them thrive?The hack Speaking to your plants is said to encourage growth.
Folding Beijing
At ten of five in the morning, Lao Dao crossed the busy pedestrian lane on his way to find Peng Li. After the end of his shift at the waste processing station, Lao Dao had gone home, first to shower and then to change. He was wearing a white shirt and a pair of brown pants—the only decent clothes he owned.
Improved Lower Bounds for Proportionally Fair Clustering
Announce Type: new Abstract: We study proportionally fair clustering, where a set of $k$ centers must be chosen from a metric space to represent $n$ agents, and no sufficiently large group of agents should be collectively underrepresented. One of the central notions of fairness in this setting is the $\alpha$-core. The existence of clusterings in the $(1+\sqrt{2})$-core was established by Chen et al.
The Best 3-in-1 Apple Charging Stations After Testing Top Models
The Best 3-in-1 Apple Wireless Chargers Featured in this article If you have an iPhone, AirPods, and an Apple Watch, congrats! You have the holy trinity of Apple products. But keeping all these gadgets powered up can be annoying, since they all have individual cables and proprietary charging solutions.
ICE facility in Louisiana reports its second detainee death in less than 2 months
ICE facility in Louisiana reports its second detainee death in less than 2 months A second detainee has died in two months at a U.S. Immigration and Customs Enforcement facility in Louisiana where a recent investigation found insanitary conditions and problems with medical care - Bookmark A second detainee has died in less than two months at a U.S. Immigration and Customs Enforcement facility in Louisiana where a recent inspection report found insanitary conditions, problems with medical...
Botox warning as Brits rushed to hospital with 'poisoning' after cut-price treatments
Botox warning as Brits rushed to hospital with 'poisoning' after cut-price treatments A small number of people were treated at NHS services in the city last week for suspected botulism poisoning – a life-threatening infection often caused by cheap, unlicensed injectables A cosmetics watchdog has issued an urgent warning after a string of people were rushed to hospital following Botox-like injections. They were treated at NHS services in Leeds last week for suspected botulism – a...