Doubly-Fed Induction Generator for Variable Speed Wind Energy Conversion Systems- Modeling & Simulation
Abstract The aim of this paper is to present the complete modeling and simulation of wind turbine driven doubly-fed induction generator which feeds ac power to the utility grid. For that, two pulse width modulated voltage source converters are connected back to back between the rotor terminals and utility grid via common dc link. The grid side converter controls the power flow between the DC bus and the AC side and allows the ....etc

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Real Time Operating Systems for Networked Embedded Systems


Fire Alarm System

Problem
Hundreds of sensors, each fitted with Low Range Wireless
Sensor information to be logged in a server & appropriate action initiated
Possible Solution
Collaborative Action
Routing
Dynamic Sensors/controllers may go down
Auto Configurable No/easy human intervention.
Less Collision/Link Clogging
Less no of intermediate nodes
Fast Response Time
Secure

Real Time System

....etc

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Dear Sir/madam
We have been using the capstone C65 microturbine and we wanted to operate it in islanded mode with a battery storage system. This time, both sources will be operating in VF mode. So, we suspected there might be some sort of operational problem related to phase angle or frequency difference and/or load sharing. So, what do u think about it? I would also appreciate if U can send me some detail specification sheets about z type of generator and inverter used.
Thanks, ....etc

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INTRODUCTION
One is emerging from perhaps the most deliberate and least colourful engineering fields of all: gas turbine engineering. Gas turbines are internal combustion engines, like the ones that drive cars, except that they use a rotating shaft or rotor instead of pistons reciprocating in cylinders. This makes their operation smooth and steady, which lowers maintenance costs and increases reliability. Though they became practical only sixty years ago, today gas turbines are one of ....etc

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ABSTRACT
MICROTURBINES are becoming wide spread for distributed power and combined heat and power applications. They range from handheld units producing less than a kilowatt to commercial sized systems that produce tens or hundreds of kilowatts. They are also known as turbo alternators, or gensets. Part of their success is due to advances in electronics, which allow unattended operation and interfacing with the commercial power grid. Electronic power switching technology eliminates the need for the generator to b ....etc

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A practical method of modeling wind generator control systems for network simulation using Matlab-Simulink is presented. The interface developed between PSS/E and Matlab-Simulink allows the models generated to be used directly in PSS/E dynamic simulation. Fundamentally, modeling involves understanding the dynamics of equipments to be modeled and deriving the differential and algebraic equations which are coded using a high level computing language. For network elements resilient to change, the latter remains the method.
However, wind generator ....etc

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