In the traditional port, disengaging hook system adopts a three-phase power frequency power to drive a three-phase asynchronous motor. The operation is simple and the maintenance is convenient. However, it still keeps the speed of mooring lines constant. Under the light-load condition, the work efficiency could be affected because of the low speed. To solve this problem, we start the research i...

With the intensive integration of photovoltaic (PV) sources into low-voltage distribution networks (LVDN), nodal voltage limit violations and fluctuation problem cause concerns on safety operation a power system. The intermittent, stochastic, fluctuating characteristics PV output leads to frequent fast voltages. To address violation problem, this paper proposes distributed regulation method bas...

This paper deals with the design, fabrication and characterization of a tool changer for micromanipulation cells. This tool changer is part of a manipulation cell including a three linear axes robot and a piezoelectric microgripper. All these parts are designed to perform micromanipulation tasks in confined spaces such as a microfactory or in the chamber of a scanning electron microscope (SEM)....

This paper proposes a novel method for planning active distribution networks (ADNs) with the integration of an network management (ANM) scheme using coordinated voltage control (CVC) through on-load tap changer (OLTC) transformers. The was formulated as security-constrained optimal power flow (SCOPF) problem to minimize total operational costs, which maximizes utilization renewable distributed ...

In this article, the dynamic thermal rating assessment method of oil-immersed power transformer with multiple operating conditions is proposed, considering constraints hot spot temperature (HST), top oil temperature, losses life and maximum allowable current on-load tap changer (OLTC) or bushing, which can determine load curves under different give most sensitive to limit capacity. To improve a...

The on-load tap changer is critical for voltage regulation, however, its regulation philosophy suitable one-directional power flow systems. Since distributed generators introduce bidirectional flow, the conventional operation of will be highly impacted, resulting in high magnitudes that exceed acceptable limits, frequent magnitude fluctuations, and increase overall reactive supply when start ab...

To solve the difficulty of eigenvalue extraction on-load tap-changer (OLTC) vibration signals, an method time-frequency matrix based on Hilbert energy spectrum and spectral entropy is proposed in this study. By optimizing Hilbert-Huang transform (HHT) algorithm, signal distribution obtained. The was extracted to characterize chaotic degree distribution, avoided problem inaccurate feature quanti...

C 2012 American Chemical Society Graphene: The Game Changer? I t has only been eight years since the isolation of graphene 1 and over a year since the 2010 Nobel Prize in Physics was jointly awarded to Andre Geim and Konstantin Novoselov “for groundbreaking experiments regarding the two-dimensional material graphene.” Nevertheless, the number of graphene publications is still rapidly growing. T...