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The problem of measuring micro pressure differences with high accuracy has many engineering applications. These include, for instance, measurement of low flow velocities using Pitot tubes, and measurement of flow rate using nozzles. This paper studied on the structures, characteristics, and the control methods of an automatic manometer, which is based on a classical liquid manometer, using laser diode...
Aimed at the inter-area low frequency oscillation in interconnected power system, the Wide-area PSS considering the time-delay of feedback signals is designed in this paper. The Wide-area PSS is composed with two-channel, the inputs of one channel are local signals without time-delay, the inputs of the other one are global signals with time-delay. Then the state equations of the closed-loop system...
Based on the inter-area oscillation characteristics in interconnected power system, the machines participating in oscillation can be equivalent to a two-machine system according to their respective inertia center. This paper first deduces electromagnetic torque coefficient for the equivalent two-machine system, which lays the foundations of electromagnetic torque analysis of inter-area oscillation...
A method is proposed in this paper to select the global input signals for Wide-area PSS to damp inter-area oscillations in large power systems. By analyzing the observability of interarea mode, the two important concepts of dominated mode and group are connected with each other. And according to two-group mutual oscillating feature and unit coherency characteristic of inter-area oscillation, the inertia...
In this paper, the characteristics of an electric shaker are analyzed first. A fuzzy PID control rules is established according to the nonlinear characteristics. The controller has a feedback - feedforward structure, which realizes a tracking control of acceleration for the electric shaker. Experimental results show that the controller works stably and obtained the satisfying control effect. Moreover,...
With the rapid development of Internet and their deep influence on our life, the user number and network traffic are increasing in geometric series on the Internet. The emergence of great lot of applications especially on text, image, advertisement, streaming media and flash require higher flexibility on the network system services. Furthermore, as more and more key applications like E-Commence are...
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