摘要
基于12扇区的双Y移30°六相电压源逆变器(VSI)电压空间矢量脉宽调制(SVPWM)存在逆变器开关次数较多、波形不对称、不利于数字化实现等问题。为解决这些问题,有学者提出24扇区的SVPWM方法,但没有涉及过调制。该文提出了一种基于扇区细分的六相SVPWM方法,将24扇区中的每个扇区进一步细分为5个区域。当调制度在0.5774~0.6221之间时,构造了谐波电压最小化的优化模型,采用外点法求解优化模型,使谐波电压得到有效抑制。与传统的12扇区SVPWM方法相比,相电压总谐波畸变率的平均值大约降低28%。当调制度在0.6221~0.6366之间时,构造了电压幅值差值最小化优化模型,使合成的相电压基波幅值略低于期望的基波幅值,但方法简单、计算量小。该方法可进一步拓展到多相电机系统,以提高系统运行性能。通过仿真分析和实验验证,验证了本文所提方法的正确性和实用性。
The space vector pulse width modulation(SVPWM)strategy for double-Y shift 30°six-phase inverter(VSI)based on 12-sector exists some problems,such as many switching times and asymmetrical voltage pulse waveform which is difficult for DSP implementation.To solve these problems,a 24-sector SVPWM strategy has been proposed in linear modulation region,but over-modulation region has not been involved.In this paper,a sector subdivision SVPWM strategy is proposed,which subdivides each sector of 24 sectors into five regions and realizes modulation in full range.When the modulation degree is between 0.5774 and 0.6221,an optimization model of harmonic voltage minimization is constructed.External point method is adopted to solve the optimization model,so that the harmonic voltage is effectively suppressed.Compared with the traditional 12-sector SVPWM method,the average value of the phase voltage total harmonic distortion(THD)is reduced by approximately 28%.When the modulation degree is between 0.6221 and 0.6366,optimization model for minimizing the difference of voltage amplitude is constructed,so that the fundamental amplitude of the synthesized phase voltage is slightly lower than the expected fundamental amplitude,but the method is simple and the amount of calculation is small.This method can be further extended to multi-phase motor systems to improve system performance.Through the simulation analysis and experimental verification,the correctness and practicability of the proposed method are demonstrated.
作者
黄守道
赵礼
郑剑
赵云云
Huang Shoudao;Zhao Li;Zheng Jian;Zhao Yunyun(College of Electrical and Information Engineering Hunan University,Changsha 410082 China;College of Electrical and Information Engineering Hunan University of Technology,Zhuzhou 412007 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第24期5070-5083,共14页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点项目(51737004)
国家重点研发计划项目(2016YFF0203400)资助。
关键词
六相电机
空间矢量脉宽调制
谐波电压
24扇区
电压源逆变器
Dual three-phase motors
space vector pulse width modulation(SVPWM)
harmonic voltage
24-sector
voltage source inverter(VSI)
