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Selecting inter-phase circulation, up and lower bridge arm current, and AC output voltage wave of the inverter as research objects, this paper analysed harmonic components in Modular Multilevel Converter (MMC) in Nearest Level Modulation (NLM) when MMC is used as inverter. With theoretical deduction, this paper points out that the up and lower bridge arm current mainly contains DC current component,...
The paper examines the use of energy storage system to smoothen the output power from wind farms, and to make dispatch planning from the wind power generators possible. Firstly wind power is segregated into components through the use of filters designed from the application of empirical mode decomposition technique. Buffering of the high- and mid-frequency components of the wind power is then effected...
In this paper, the thermal field of a large scale permanent magnet embedded salient pole wind generator (PMESPWG) is investigated by using the computational fluid dynamic (CFD) modeling. To reduce the calculation, only one quarter model of the PMESPWG is established according to its symmetry. Based on the electromagnetic analysis and the empirical equations, the copper loss, stator iron loss and rotor...
This paper studies a new switch fast LMS/Newton algorithm for acoustic echo cancellation. By employing the envelop tracking voice activity detection technique, an efficient switch scheme is developed, which can help the proposed algorithm distinguish the significant and insignificant input speech periods and thus work between the fast LMS/Newton and NLMS modes, respectively. Hence, convergence can...
Graphene is a typical two-dimensional material which has fascinating electrical, mechanical, and optical properties. In particular, graphene-based smart MEMS/NEMS devices can automatically respond to external electric stimulation and convert to mechanical movement. Actuator is one of the most potential applications of graphene-based MEMS. However, its reliability investigation has rarely been reported...
Dilute ferromagnetic semiconductors such as III-Mn-V have lately attracted amount of attention, due to the considerable potential for spintronic device [1]. From the application point of view, the current-induced magnetization reversal originating from a spin transfer torque (STT) raises a special need for preparing DMS materials with a large perpendicular magnetic anisotropy (PMA) [2, 3]. The PMA...
Planar wire array Z pinches were carried out on the QiangGuang-I facility (1.3 MA, 100 ns). The effect of prepulse current and insulating coatings on the Z pinch behavior is investigated. Commonly there is a multichannel gas switch filled with 0.5 Mpa dry air between the transmission line and the MITL to cut off the prepulse current. By varying gas pressure filled in the switch, the parameters of...
Recent L band dielectric measurements of corn stalks have shown a periodic behavior between node and internode measurements. Based on these measurement results, a corn stalk has been modeled by a dielectric cylinder with a periodic dielectric variation along its length. The development of this model is part of an effort to understand how backscatter and emission from vegetation is related to its moisture...
Motivated by applications in biology and economics, we propose new volatility measures based on the H2 system norm for linear networks stimulated by independent or correlated noise. We identify critical links in a network, where relatively small improvements can lead to large reductions in network volatility measures. We also examine volatility measures of individual nodes and their dependence on...
The SPECIALIST algorithm can resolve jam waves on freeways using roadside technology: detector loops and speed limit gantries. In this paper we extend the algorithm, enabling the integration with cooperative system technologies and other road side detectors, such as in-car detection and actuation, and video-based monitoring (VBM). Integrating these cooperative elements can provide faster and more...
In this paper, a novel square silicon nanoholes light-trapping structure of solar cells was prepared by improved electroless etching method, which is different from the irregular nanoholes and round nanoholes reported earlier by corrosion method in the silicon substrate. We analyzed the formation process of this structure and found that the concentration of nitric acid silver in the solution can determine...
In this paper, we present a fabrication process for an extremely compact, multi-layer, vertically-stacked fused silica microsystem. The system contains six fused silica layers in a total volume of less than 13 mm3. In the package are seven capacitive sensors designed as a six-degree of freedom inertial measurement unit plus a resonant timing device. Sixty-eight vertical electrical feedthroughs run...
The emergence of electric vehicle (EV) provides a potential opportunity to enhance energy security and to reduce carbon emission generated by petrol and diesel powered road transport systems. Unfortunately, a great deal of charging EVs pose a newly added load to electric power systems and the total energy production cost of power systems consequently increases. An easy-solved methodology for scheduling...
Networks of controlled dynamical systems exhibit a variety of interconnection patterns that could be interpreted as the structure of the system. One such interpretation of system structure is a system's signal structure, characterized as the open-loop causal dependencies among manifest variables and represented by its dynamical structure function. Although this notion of structure is among the weakest...
Permanent Magnet Synchronous Machines (PMSM) are used in many applications, particularly in high-performance drive systems. However, one inherent problem of PMSM is its parasitic undesired torque ripple, which reduces the PMSM performances. Several kinds of parasitic torque ripples are periodic functions of the rotor position. To reduce them, a method called Iterative Learning Control (ILC) seems...
This paper presents deposition and characterization of zinc oxide (ZnO) thin films for smart sliders. ZnO thin films with two different c-axis orientations were prepared using RF magnetron sputtering. A piezoelectric ZnO sensor array was fabricated using fabrication techniques compatible with standard slider micromachining process.
A piezoelectric sensor array deployed on the trailing side of the slider was investigated for its capability in head-disk contact detection. Harmonic and transient responses were obtained by finite element analysis. Performance of the triple-sensor array was compared with that of a single sensor configuration. Under excitation of a typical contact force, output voltages of the sensor array of the...
This study considers the discrete-time dynamics of a network of agents that exchange information according to the nearest-neighbour protocol under which all agents are guaranteed to reach consensus asymptotically. We present a fully decentralised algorithm that allows any agent to compute the consensus value of the whole network in finite time using only the minimal number of successive values of...
A statistical approach is proposed in the assessment of voltage quality of network interconnected to a wind-farm. Random wind speed and uncertainty in the network status contribute toward the stochastic nature of the voltage quality. The analysis takes into consideration the reactive power capability of wind turbine generators (WTG). Judicious application of the reactive power control is shown to...
Successful product design depends on the ability to effectively manage and share engineering knowledge and experience throughout the entire development process. Thus, this paper presents a distributed engineering knowledge management approach for the practice of collaborative product design. Firstly, by combining meta-knowledge with XML based topic maps (XTM), a heterogeneous knowledge integration...
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