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Recently, cloud computing has become popular for its unique advantages. Many applications have been migrated to cloud as web services. However, evaluating the performance of cloud services is non-trivial. Performance testing is one of the dominant techniques for evaluating system performance. In this paper, we present a model and template-based approach that automatically generates test scripts and...
A novel open-winding configuration of the permanent magnet generation system has been proposed with the rectifier-inverter topology. The rectifier is in series to one side of the open-end winding for the output DC voltage and inverter to another side for controlling. The topology has the feasibility of voltage regulation in the wide speed range compared to the traditional permanent magnet generation...
This paper presents a novel integrated starter-generator system consisted of engine, open-winding permanent magnetic synchronous machine, storage battery, voltage source converter (VSC) and rectifier for overcoming the difficulties of voltage regulation and narrow speed range of conventional integrated starter-generator system based on permanent magnetic machine. In the proposed system, one side of...
Internal faults in a wind driven generator can affect the quality of its output power, sometimes even the system's safety. However, the fault experiments are dangerous, thus this paper presents a Hardware-in-the-Loop (HIL) simulation system based on RT-LAB and DSP, which was applied to research the transient behavior of a doubly salient electro-magnetic wind power generator (DEWG) system and the control...
In this paper, a usage model is proposed to simulate users' behaviors realistically in load testing of web applications, and another relevant workload model is proposed to help generate realistic load for load testing. It also demonstrates an eclipse-based load testing tool “Load Testing Automation Framework (LTAF)” which is based on these two models and can perform load testing of web applications...
An integral dynamic model of a wind power generation system containing non-linear wind models, a fixed-pitch stall-regulated wind turbine model, a mechanical transmission model, a multi-pole low-speed doubly salient electro-magnetic generator model, and an electric control model are established in this paper with MATLAB/Simulink. The mathematical simulation tool of the novel doubly-salient electro-magnetic...
Conventional PI regular is a simple control method that is widely applied in permanent magnet synchronous motor (PMSM) control systems. However, in most cases, it cannot meet the requirements of high performance control. In order to improve system robustness and response, this paper adopts sliding mode variable structure control strategy in the design of a double-loop controller (speed loop and current...
The data flow of video signal are largest in all kinds of data that are transmitted on the control network in coal mine scene, and the video signal also has the most prominent influence on real-time and reliability of network. 100 M mine integrated automatization network, which is established by adopting Ethernet technology, did not connect or transmit multimedia date parallelly considering time delay...
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