ABSTRACT This paper presents a study on the influence of different rectifiers on a super-high-speed permanent magnet generator (SHSPMG), which is used in a micro-gas turbine distributed generation system. Taking a 117 kW, 60,000 r/min SHSPMG as an example, the influence of PWM and uncontrolled rectifiers on the generator performances were studied comparatively. The current harmonics and its total harmonic distortion were analysed firstly, and the variation characteristics of voltage and current harmonics were obtained. Based on the 2-D electromagnetic analysis model, the losses of the generator with different rectifier load were studied, especially for the rotor losses, and the mechanisms of the losses variation were determined. By using the method of the 3-D coupling field between fluid and temperature, the temperature distributions of the SHSPMG connected with the PWM and uncontrolled rectifiers were calculated, respectively, and the influences of the different rectifiers on the generator temperature field were studied. It could be found that the PWM rectifier has the advantages of reducing generator losses and optimizing temperature distribution.

中文翻译：

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PWM与不控整流超高速永磁发电机电磁场和温度场对比分析

摘要 本文研究了不同整流器对用于微型燃气轮机分布式发电系统的超高速永磁发电机 (SHSPMG) 的影响。以一台117 kW、60,000 r/min的SHSPMG为例，对比研究了PWM和不可控整流器对发电机性能的影响。首先分析了电流谐波及其总谐波畸变，得到了电压和电流谐波的变化特性。基于二维电磁分析模型，研究了不同整流负载下发电机的损耗，特别是转子损耗，确定了损耗变化的机理。通过使用流体和温度之间的 3-D 耦合场的方法，分别计算了连接PWM和不控整流器的SHSPMG的温度分布，研究了不同整流器对发电机温度场的影响。可以发现PWM整流器具有降低发电机损耗和优化温度分布的优点。