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In this paper, an adaptive integrated hybrid AC/DC microgrid module is proposed to accommodate a wide range of Distributed Renewable Energy Resources (DRERs), Distributed Energy Storage Devices (DESDs) and Distributed Demand Resources (DDRs) into the existing distribution systems. The concept and the architecture of adaptive integrated hybrid AC/DC microgrid module have been elaborately explained...
Reliability prediction is widely used in industry for estimating field-reliability of a system before empirical data are available for the system. The two branches of reliability prediction, statistical based method and physics-of-failure based method are adopted in different industry sectors to make full use of their different merits. However, for power converters in electric drive system, the operation...
This paper explores the interconnection of multiple microgrid with “tie-line”. Tie-line control can be managed to control the power flow from microgrid and voltage at respective microgrid buses at the point of interconnection. Formation of such DC microgrid cluster ensures higher reliability of power supply and flexibility to manage distributed energy resources and loads in the system. Two identical...
The multi-actuation-based model predictive control (MPC) method can significantly improve the steady-state performance of cascaded H-bridge (CHB) inverters. However, a large computational burden is generated on digital controller when this method is applied for CHB inverter due to its large number of control actuations. In this paper, a new MPC method is proposed for a single-phase CHB inverter. In...
A bipolar dc microgrid features three voltage levels and is capable of transmitting power more efficiently than a unipolar system. This paper proposes a droop control to achieve load sharing and voltage balancing in such a microgrid system. Droop control is adopted to ensure that autonomous sharing of load power can be realized without communication. Moreover, the positive and negative pole voltages...
The key problem of task allocation in many applications of WSANs such as intelligent minefield is how to obtain the node-target assignment to achieve the maximum task effectiveness of the whole system. Since the performance of sensors and weapons and targets' capability of avoidance detection are very variable, different sensor/weapon-target allocations lead to different probabilities of acquisition...
Driven by the exponentially increasing amount of mobile video traffic, caching videos closer to the end users has become an appealing solution to reduce the traffic through the backbone network while improving users' perceived quality-of-experience (e.g., better video quality and reduced service delay). This research interest has been gaining lots of momentums due to the emergence of smart Access...
We propose all-optical signal upconversion scheme using optically-injected DFB in combine with embedded optoelectronics oscillator for RoF application. The low-noise LO provided by OEO and near-SSB modulation implemented by injection locking enables high-performance in transmission.
We report on the circuit design and experimental demonstration of a battery-less, self-powering temperature sensor node, powered entirely by a piezoelectric (PZE) ambient vibrational energy harvester, and enabled by a novel ultra-low-power application-specific integrated circuit (ASIC). The ASIC collects and stores energy generated by the PZE transducer into a supercapacitor, powers both the on-ASIC...
Cloud storage services such as Dropbox have been widely used for file collaboration among multiple users. However, this desirable functionality is yet restricted to the “walled-garden” of each service. At present, the only effective approach to cross-cloud file collaboration seems to be using web APIs, whose performance is known to be highly unstable and unpredictable. Now that using inefficient web...
Extracting intuitive and useful information from the high-dimensional, fuzzy and complex operational simulation training data is in urgent need. In this paper, the operational simulation training data refers to the quantitative, numeric data that is usually used as the simulation results. The traditional statistical analysis methods have some limitations in clustering, visualizing and evaluating the...
A discrete-time distributed algorithm to solve a system of linear equations Ax = b is proposed with the M-Fejer mappings in this paper. The algorithm can find a solution of Ax = b from arbitrary initializations at a geometric rate when Ax = b has either unique or multiple solutions. The geometric convergence rate of the algorithm is first proved by analyzing the mixed norm of homogeneous M-Fejer mappings...
BulletProof Hosting (BPH) services provide criminal actors with technical infrastructure that is resilient to complaints of illicit activities, which serves as a basic building block for streamlining numerous types of attacks. Anecdotal reports have highlighted an emerging trend of these BPH services reselling infrastructure from lower end service providers (hosting ISPs, cloud hosting, and CDNs)...
With the development of renewable resources, large amounts of Distributed Generation (DG) units penetrated into distribution network. Instead of traditional passive PQ bus equivalence, DG characterized Active Distribution Network (ADN) need to be appropriate modeled as active components to represents its dynamic behaviors. Though existed ADN equivalent research considered the inverter-based DG units...
This paper presents the implementation of a hardware-in-the-loop simulation (HIL) workbench for hybrid AC/DC micro grid. The hybrid AC/DC micro grid integrates both distributed sources and loads in AC/DC systems to respective links directly. For DC system, photovoltaic arrays with boost converter (PVBC), battery with bi-directional DC/DC converter and DC loads are covered. Diesel generator (DGs) and...
Presented in this paper is a development of a high-performance piezoresistive micro-accelerometer based on the slot etching in the EB (eight-beam) structure for the vibration detection of high speed spindle. The proposed SEB (slotted eight-beam) structure consists of a proof mass supported by four slotted sensing beams and four suspension beams, which in order to improve the trade-off between the...
Many efforts have been paid to enhance the security of Android. However, less attention has been given to how to practically adopt the enhancements on off-the-shelf devices. In particular, securing Android devices often requires modifying their write-protected underlying system component files (especially the system libraries) by flashing or rooting devices, which is unacceptable in many realistic...
The flexibility and expandability of the Modular Multilevel Converters (MMCs) from the modularized hardware may be reduced because of the conventional centralized control strategies. A distributed control architecture that is capable of assigning individual control task to distributed local controllers is proposed in this paper to address this issue. Although a central controller dealing with the...
Modular Multilevel Converters (MMCs) are multi-input-multi-output (MIMO) nonlinear systems. The control systems for MMCs are required to simultaneously achieve multiple control objectives. Existing cascaded control strategies for MMCs are complex and the controller parameter design is not straightforward for the nonlinear systems with highly coupled states. In view of this, a feedback linearization...
Emerging non-volatile memories enable persistent memory, which offers the opportunity to directly access persistent data structures residing in main memory. In order to keep persistent data consistent in case of system failures, most prior work relies on persist ordering constraints which incurs significant overheads. Strand persistency minimizes persist ordering constraints. However, there is still...
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