Testing of Active Rectification Topologies on a Six-Phase Rotating Brushless Outer Pole PM Exciter
Testing of Active Rectification Topologies on a Six-Phase Rotating Brushless Outer Pole PM Exciter
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DOI：
10.1109/tec.2017.2746559
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发表时间：
2018-03
影响因子：
4.9
通讯作者：
J. Nøland;F. Evestedt;J. J. Pérez-Loya-J.;J. Abrahamsson;U. Lundin
中科院分区：
文献类型：
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作者：
J. Nøland;F. Evestedt;J. J. Pérez-Loya-J.;J. Abrahamsson;U. Lundin
由于传统无刷励磁机动态性能较弱，静态励磁机在大型并网发电机中占据主导地位。在本文中，使用不同的有源整流拓扑对六相双星外极永磁旋转无刷励磁机进行了评估。基于晶闸管和基于斩波器的拓扑都被考虑。通过用所提出的轴上有源整流拓扑取代传统的旋转二极管桥式整流器，获得了高速响应无刷励磁系统。与静态励磁机相反，给定的两级系统直接从轴产生自己的励磁功率。对于给定的发电机励磁电流，选择适当的整流拓扑可以最小化转子电枢相电流。目标是励磁机的高功率因数和高利用率。最佳整流拓扑使更高的上限电流成为可能，从而改善同步发电机的瞬态行为。在本文中，我们表明六相拓扑增加了复杂性，但改善了励磁机冗余，增加了可用上限电压，并减少了稳态扭矩脉动。给出的实验结果用于验证为分析而实施的模型。
The static exciter is dominating among large grid-connected generators due to the weak dynamic performance of conventional brushless exciters. In this contribution, a six-phase double-star outer pole permanent magnet rotating brushless exciter is evaluated with different active rectification topologies. Both thyristor-based and chopper-based topologies are considered. A high speed response brushless excitation system is obtained by replacing the conventional rotating diode bridge rectifier with the proposed active rectification topologies on the shaft. The given two-stage system generates its own excitation power directly from the shaft, contrary to static exciters. The selection of an appropriate rectification topology could minimize the rotor armature phase currents for a given generator field current. The objective is a high-power factor and a high utilization of the exciter machine. An optimal rectification topology makes higher ceiling currents was possible, improving the transient behavior of the synchronous generator. In this paper, we show that six-phase topologies add complexity, but improve exciter redundancy, increase the available ceiling voltage, and reduce the steady-state torque ripple. Experimental results are given for validating the models implemented for the analysis.