We consider a dynamic model of electric vehicle (EV) charging in a power distribution grid. We introduce uncertainty in the demand side, arising through consumer behavior, as well as the supply side, to account for in...
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ISBN:
(数字)9781665405577
ISBN:
(纸本)9781665405577
We consider a dynamic model of electric vehicle (EV) charging in a power distribution grid. We introduce uncertainty in the demand side, arising through consumer behavior, as well as the supply side, to account for intermittent renewable energy sources (RES). By developing a fluid approximation, we show that the invariant point of the stochastic process can be obtained by solving an AC-OPF problem with an exact convex relaxation, thereby creating a deterministic and computationally efficient analysis of the charging capacity of the network. We illustrate the accuracy of our fluid approximation by detailed simulation studies. Next to that, we use the model to assess boththe impact of RES generation and the physical location of RES in the network. this way, we create a measure for the positioning of additional RES or local energy storing systems.
An optimally designed GPS receiver can typically achieve 3-5 meters accuracy. this accuracy is insufficient for autonomous navigation where the margin of error must be low. Some existing sensor fusion approaches (IMU ...
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Over the years, research and development into micro-force sensing techniques has gained a lot of traction, especially for microrobotic applications, such as micromanipulation and biomedical material characterization s...
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ISBN:
(数字)9781665459730
ISBN:
(纸本)9781665459730
Over the years, research and development into micro-force sensing techniques has gained a lot of traction, especially for microrobotic applications, such as micromanipulation and biomedical material characterization studies. Moreover, in recent years, new microfabrication techniques have been developed, such as two-photon polymerization (2PP), which enables fast prototyping, high resolution features, and the utilization of a wide range of materials. In this work, these two fields are combined to realize the first fully 3D printed vision-based micro-force sensor. the sensor exhibits tunable stiffness properties, which are simulated and compared with calibration values for a variety of 2PP printing settings. Lastly, the sensors are used to measure the mechanical properties of fish eggs as a cell analog to showcase the possible applications of the system.
All living things - animals, plants, and people - need water to survive. the ability of roots to absorb vital nutrients from the soil makes water crucial for plants. We can't water our plants when we are away from...
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A homogeneous team of an unknown size consists of indiscernible mobile robots that carry no communication facilities and cannot play distinct roles and so should be driven a common control rule. the state of any robot...
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Recent studies showed that Photoplethysmography (PPG) sensors embedded in wearable devices can estimate heart rate (HR) with high accuracy. However, despite of prior research efforts, applying PPG sensor based HR esti...
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We propose SmartON, a batteryless system that learns to wake up proactively at the right moment in order to detect events of interest. It does so by adapting the duty cycle to match the distribution of event arrival t...
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ISBN:
(纸本)9781665439299
We propose SmartON, a batteryless system that learns to wake up proactively at the right moment in order to detect events of interest. It does so by adapting the duty cycle to match the distribution of event arrival times under the constraints of harvested energy. While existing energy harvesting systems either wake up periodically at a fixed rate to sense and process the data, or wake up only in accordance withthe availability of the energy source, SmartON employs a three-phase learning framework to learn the energy harvesting pattern as well as the pattern of events at run-time, and uses that knowledge to wake itself up when events are most likely to occur. the three-phase learning framework enables rapid adaptation to environmental changes in both short and long terms. Being able to remain asleep more often than a CTID (charging-then-immediate-discharging) wake-up system and adapt to the event pattern, SmartON is able to reduce energy waste, increase energy efficiency, and capture more events. To realize SmartON we have developed a dedicated hardware platform whose power management module activates capacitors on-the-fly to dynamically increase its storage capacitance. We conduct both simulation-driven and real-system experiments to demonstrate that SmartON captures 1X-7X more events and is 8X-17X more energy-efficient than a CTID system. All source code and hardware design files are open-sourced(1).
In modern power system, the connection between distribution network and distributed integrated energy system is becoming increasingly prevalent, which greatly influenced the operation strategy and reliability of the t...
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In modern power system, the connection between distribution network and distributed integrated energy system is becoming increasingly prevalent, which greatly influenced the operation strategy and reliability of the traditional distribution network. To evaluate the reliability of distribution network more precisely, a reliability evaluation method considering the integration impact of distributed integrated energy system is proposed. Firstly, the structure and mathematical model of the united energy system are described. Secondly, taking the minimum sum of operation and load reduction cost as the objective function, the optimal load reduction models of distribution network and distributed integrated energy system are established. Due to the interest game between these two systems, analytical target cascading theory is applied to deal withthe decoupling of these two models. thirdly, the reliability evaluation of the united system is performed based on Monte Carlo Simulation method. the simulation study of a modified ieee RBTS system with a distributed integrated energy system indicates the effectiveness of the proposed method. (C) 2022 Published by Elsevier Ltd.
distributed feeder automation in 5G(5th Generation Mobile Communication Technology) communication has the ability to handle faults quickly, which can significantly improve the reliability of power supply. However, 5G ...
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ISBN:
(纸本)9781665489577
distributed feeder automation in 5G(5th Generation Mobile Communication Technology) communication has the ability to handle faults quickly, which can significantly improve the reliability of power supply. However, 5G communication has the characteristics of uncertain time delay, which makes it difficult to meet the requirements of high real-time communication interaction between feeder terminals. A switching method of feeder automation control strategy based on 5G communication delay is proposed. Firstly, a method for calculating the overall real-time communication delay of the feeder automation system is proposed;then, the communication delay interval is preset according to the communication requirements of the distributed feeder automation system;Finally, the real-time communication delay is compared withthe preset communication delay interval, and the feeder automation strategy of the distribution network is switched according to the comparison result. the simulation results show that this method can overcome the influence of the uncertain delay of 5G communication on the distributed feeder automation system, effectively improve the speed of transfer and recovery of the distribution network after a fault, and ensure the safety of the operation of the distribution network.
the increasing penetration of distributed generations (DGs) challenges the reliability and safety operation of distribution networks. Conventional relay protection schemes usually ignore the detail features of DGs as ...
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