TAILIEUCHUNG - Energy Storage Part 2

Tham khảo tài liệu 'energy storage part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 4 Energy Storage Multiphase systems Increasing the voltage is not the only strategy in the windings design to improve the performance of generators. Multiple phase systems and more than one set of windings in the stator have been proposed and currently under development. There are several advantages in multiple phase systems from the generators point of view. With multiphase systems the magnetic field distribution in the air gap is more homogeneous and the power is distributed into more phases reducing the current in every phase. Note that the reduction in current per phase does not reduce the current density nor the Joule losses as the slots in the stator have to be divided into more phases. The improvement of lower currents per phase relies in the lower power ratings in inverters and lower short circuit current in case of fault. Designers are usually restricted to the three phase system as generators have to match the standard electric grid three phase system. Nevertheless there are several threads of investigation in this field. The Powerformer discussed in section has two sets of independent windings in the stator at different voltage levels. The main windings deliver power to the grid at high voltage higher than the ancillary services. To supply different plant equipment the Powerformer may have a devoted set of windings generating at lower voltage rate Touma-Holmberg Srivastava 2004 . The first application for two winding generator was developed as early as 1920 s. In order to lower fault current in large generators and allow electrical segregation of bus sections in power stations two identical layers of three-phase winding were proposed. Nowadays the same idea has been adopted to decrease the power rating of high power traction drives. Stators designed with a double star stator configurations require two power inverters but at half of the power rate. The double winding configuration is also applied for inductance machines. In both cases the .

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