摘要
[目的]为改善舰船高频逆变充电装置输出正弦波的质量,同时降低CPU占用率,提出一种基于切线逼近的非对称规则采样正弦脉冲宽度调制(SPWM)方法。[方法]根据基于切线逼近的非对称规则采样SPWM方法的基本原理及计算方法,搭建Matlab/Simulink仿真模型,设计适用于高频逆变充电装置的软件算法流程,并对切线逼近法的实际输出效果进行仿真对比和实验验证。[结果]仿真结果表明,在纯阻性负载和阻感性负载下,基于切线逼近法的负载端波形的总谐波失真(THD)分别为2.12%和2.08%,其波形质量优于对称规则采样法;实验结果表明,基于切线逼近法的负载端波形的THD明显低于对称规则采样法,当输入线电压有效值为580 V(调制比为0.8)时,输出波形的质量相对最优。[结论]基于切线逼近的非对称规则采样SPWM方法克服了传统对称规则采样法的输出波形质量不高,以及传统非对称规则采样法的采样频率高、CPU占用率高等缺点,研究成果可为舰船高频逆变充电装置设计提供参考。
[Objectives]In order to improve the quality of sinusoidal waveform output by the ship's high-frequency inverter charging device and reduce the CPU occupancy rate,an asymmetric regular sampling sinusoidal pulse width modulation(SPWM)method based on tangent approximation is proposed.[Methods]According to the basic principle and calculation method of the asymmetric regular sampling SPWM method based on tangent approximation,a Matlab/Simulink simulation model is built,and then the software algorithm flow that can be used in the high-frequency inverter charging device is designed together with the actual output of the tangent approximation method.The effects are then compared and verified by experiments.[Results]The simulation results show that under pure resistive load and resistive inductive load,the total harmonic distortion(THD)of the load-end waveform based on tangent approximation method is 2.12%and 2.08%,respectively,and its waveform quality is better than symmetric regular sampling.The experimental results show that the THD of load-end waveform based on the tangent approximation method is significantly lower than the symmetric regular sampling method.When the effective value of the input line voltage is 580 V(the modulation ratio is 0.8),the quality of the output waveform is relatively optimal.[Conclusions]The asymmetric regular sampling SPWM method based on tangent approximation overcomes the shortcomings of the traditional symmetric regular sampling method,such as the low quality of the output waveform and the traditional asymmetric regular sampling method's high sampling frequency and high CPU occupancy rate.The research results can provide reference for the design of ship's high frequency inverter charging devices.
作者
李巍
李维波
徐聪
卢月
陈辉
LI Wei;LI Weibo;XU Cong;LU Yue;CHEN Hui(School of Automation,Wuhan University of Technology,Wuhan 430070,China;Institute of Technology,Tibet University,Lasa 850012,China)
出处
《中国舰船研究》
CSCD
北大核心
2020年第6期46-54,共9页
Chinese Journal of Ship Research
基金
武汉理工大学研究生优秀学位论文培育项目(2018-YS-064)。
