谐波电流最小优化同步SVPWM方法研究  

Research on Optimised Synchronous Space Vector Pulse Width Modulation Algorithm to Minimise Harmonic Current

作　　者：张朝阳[1] 张晓华[1] 葛兴来[1] 冯晓云[1] 许峻峰 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]中车株洲电力机车研究所有限公司,湖南株洲412001

出　　处：《西南交通大学学报》2017年第4期764-773,788,共11页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51677156)

摘　　要：为解决大功率牵引逆变器在低载波比下输出电流谐波含量大的问题,以谐波电流有效值最小为优化指标,提出了一种基于空间电压矢量的优化同步PWM(space vector pulse width modulation,SVPWM)方法.首先,根据传统同步调制输出电压波形满足多种对称性的特点,提出一种通用的构造待优化空间矢量序列集合方法;其次,基于构造出的矢量序列集合,依次进行了单个矢量序列优化开关角度求解、整体优化求解和系统级优化选择;最后,将优化结果与基于相电压波形的优化PWM(pulse width modulation)方法进行比较,分析结果表明:该优化SVPWM方法将变量求解区间缩小了2/3;求解结果对迭代初值不敏感,对任意初值都能收敛到全局最优解.One of the major concerns with regard to high-power traction inverters is the current harmonics that arise when working under the condition of low pulse ratios. To solve this problem, an optimized synchronous space vector pulse width modulation （ SVPWM） was proposed to minimize root- mean-square （RMS） value of harmonic currents. On the basis of symmetry constraints of the output voltage waveforms in the traditional synchronous SVPWM, a generalized method was proposed to construct switching vector sequences. Using the constructed switching sequences set, the switching angle of a single vector sequence was optimized, and an overall optimization solution and system-level optimization selection were executed. Compared with the phase-voltage-oriented optimization pulse width modulation （ PWM） , the proposed optimized synchronous SVPWM algorithm can reduce 2/3 range of the solution set, and achieve convergence to the global optimal solution at any given initial value of the iteration, regardless of the initial value.

关 键 词：空间电压矢量 优化同步PWM 矢量序列 开关角度 谐波电流 

分 类 号：TM42[电气工程—电器]