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In this paper, a new generator-converter system for direct drive wind turbines in order to decrease the capital cost and improve the system reliability is presented. The grid-side Voltage Source Inverter (VSI) is replaced by a single-stage boost inverter. This provides flexibility to design a low-voltage generator and thus decreasing the number poles required in the generator. A 1.5MW generator for...
This paper reports on the design and testing results from the U.S. Department of Energy Next-Generation Wind Turbine Drivetrain Project. The drivetrain design reduces the cost of energy by increasing energy capture through drivetrain efficiency improvements; by reducing operation and maintenance costs through reducing gearbox failures; and by lowering capital costs through weight reduction and a series...
The integration of the internal combustion engine, the starter and the generator into a single power unit allows one to decrease significantly mass and outer dimensions of off-line systems. Analytical and graphical descriptions in dq axis at generator mode are given in this paper. The results of mathematical modeling are obtained.
For the purpose of high quality output voltage generation of a stand-alone wind turbine installation, multilevel H-bridge inverter is more suitable then the conventional inverters. This paper presents the modeling and simulation of a stand-alone wind turbine installation feeding a three-cascaded H-bridge inverter using the symmetrical control technique. A performance analysis of the impact of the...
The structure and control strategy of a novel two-phase brushless exciter were first proposed in this paper to solve the excitation problem of the main generator when three-stage brushless synchronous starter/generator starts up. Two-phase symmetrical winding was adopted as the field winding of the exciter, and was supplied with two-phase AC or DC by a two-phase inverter. This new exciter and control...
The design of a direct drive PM synchronous generator for a tidal stream subsea turbine is presented in this paper. The generator design must comply with a set of very narrow restrictions concerning the available volume, the required output, the maximum current of the three-phase marine cable and the inverter maximum voltage. For these reasons the obtained design is not able to completely fulfill...
This paper presents a novel cage induction generator and a mathematical model, through which its behavior can be accurately predicted. The novelty of the generator is due mainly to the constant frequency electricity generation, without an intermediate inverter stage, by a 3-phase cage induction machine operated at varying rotor speeds. The technique uses any one of the three stator phases of the machine...
In this paper, the idea of operating an inverter as a synchronous generator is developed after establishing a model for synchronous generators to cover all dynamics without any assumptions on the signals. The inverters which are operated in this way are called static synchronous generators (SSG). This means that the well-established theory/device for synchronous generators can still be used for inverters,...
In this paper, the capacity calculation of control winding of new style dual stator-winding induction generator by analytic method under resistive load is analyzed. A general calculation equation is deduced. And the capacity of system under variable rotor speed and variable load conditions is calculated respectively. The change laws of reactive power caused by the varying of generator parameters,...
HTS-excited synchronous machines provide substantial advantages with respect to efficiency, size, and operational behavior, with special focus on ship or off-shore applications. A 400 kW machine had been designed and built as technology demonstrator at Siemens to explore the feasibility of critical components and system interactions. After successful conclusion of these tests a first real-size machine...
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