节点文献
电力推进船舶电网谐波分析
Harmonic Analysis of Power System of Electric Propulsive Shipping
【作者】 李先林;
【导师】 樊印海;
【作者基本信息】 大连海事大学 , 电力电子与电力传动, 2004, 硕士
【摘要】 本文对电力推进船舶电网的谐波问题进行了深入的研究。首先对船舶电气进行了分类和归纳,研究了谐波对船舶电气产生的影响和危害;对于不同的电路拓扑结构,尤其以用电设备交流侧电路结构的不同,深入分析了各自谐波产生的原因、谐波的特点。在前人的成就上,考虑到大多数电力电子设备,在交流侧通常为三相桥式整流电路,而在船舶电力系统中,电阻—电感性负载居多,这种情况具有很大的普遍性。因此,本文在上述文献的基础上,对接入电压波形畸变的电网中的三相桥式整流电路进行了分析,采用了一种实用的新方法来计算三相桥式整流器所产生的谐波电流。本方法考虑了交流侧电抗及电网中存在的谐波电压,导出了交直流两侧谐波电流的计算公式。使其具有较高的准确性和实用性,且与船舶电网的实际情况更相吻合。在谐波的测量方面,比较、分析了目前常用的各种方法,结合船舶电网的实际特征,采用了一种新瞬时谐波的检测方法,该方法具有与瞬时无功功率法同样的实时性,同时解决了计算量大的问题,也克服了检测精度和检测实时性的矛盾。实现了谐波检测的软、硬件相结合。
【Abstract】 Harmonic problems in the power system of electric power pulsive shipping are discussed in this articl.The first, electric apparatus relate to ship are sorted:Then effects caused by harmonic are analysised;To different circuittopologies, the causes of producing harmonic and the characteristics are analysised detailedly. For electric power pulsive shipping, the voltage is not always normal, especially when the main motor is starting, and three-phase bridge commutated circuit is used widely, so, a new method to compute harmonic is developed, which is more accurate and practical, is more adapt to the ship condictions. In harmonic measure aspect, all kinds of method used frequently now are anlysised and compared. A new measuring harmonic method based on the theory of instantaneous reactive power is developed, which resolve the contravention between the accuracy and the real time in measuring harmonic.
【Key words】 Electric propulsive shipping; Harmonic resource; Harmonic analysis; Instantaneous reactive; Power DFT Discrete Fourier Transform;
- 【网络出版投稿人】 大连海事大学 【网络出版年期】2004年 04期
- 【分类号】U665
- 【被引频次】33
- 【下载频次】725