整流型、冲击性等非线性负荷在电力推进船舶中的使用十分普遍,这些非线性负荷的存在,导致电能出现畸变、波动、闪变和三相不平衡等质量问题,目前最严重的问题就是谐波.谐波能导致船舶电网供电质量降低,甚至恶化电网运行状况.如何快速地检测出谐波,成为了全世界关注的焦点之一.本文设计一种基于快速傅立叶变换的算法,以电力推进船舶交流异步电动机矢量控制调速系统为例,并用Matlab仿真,对异步电机的三相输入电流进行采样,编程实现算法,用样点计算谐波.%Rectifier, the impact of non-linear loads such as electric propulsion of ships in use is widespread, the existence of these non-linear loads, resulting in distortion of power there, fluctuations, flicker and unbalance other quality problems, the most serious problem is harmonic. Harmonics can lead to reduce quality of power supply ships, and even worse grid operation. In this way, how quickly detect harmonic, became the focus of world attention. This paper designs a fast Fourier transform-based algorithm to electric propulsion ship speed AC induction motor vector control system, for example, and using Matlab simulation of three-phase induction motor input current sampling, programming algorithms, using samples calculation of harmonics.
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