利用中间矢量的9相空间矢量PWM控制  

Nine phase Space Vector PWM Technology Using Medium Vectors

作　　者：于文娟[1] 刘东[1] 黄进[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《高电压技术》2013年第11期2807-2813,共7页High Voltage Engineering

摘　　要：针对传统多相空间矢量脉冲宽度调制(space vector pulse width modulation,SVPWM)控制技术中存在的直流母线电压利用率低、共模电压高等问题,提出了一种基于多相SVPWM控制的优化算法。以9相变频调速系统为例,通过对9相电压源逆变器的512个空间电压矢量进行优化选择,选取d1-q1平面上最大矢量子集中的矢量和1组中间矢量子集中的矢量合成得到18个中间矢量,利用这18个中间矢量,优化设计出一种新的基于中间矢量的9相SVPWM控制方法,可以抑制共模电压,提高直流母线电压利用率,同时减小电流谐波。为了验证上述理论,构建了一台多相感应电机变频调速系统,采用传统矢量SVPWM、特征矢量SVPWM以及中间矢量SVPWM 3种不同的控制策略对其进行控制,并进行了对比分析,结果发现:采用中间矢量SVPWM控制技术,系统的共模电压减小了1/3,直流母线电压利用率得到有效提高,且定子电流谐波得到抑制。To solve the problems of low utilization ratio of DC bus voltage and high common-mode voltage in traditional multi-phase space vector pulse width modulation（SVPWM） control, we proposed an optimal algorithm based on multi-phase SVPWM control. Taking a nine-phase variable-frequency speed control system for example, we analyzed 512 space voltage vectors of the nine-phase voltage source inverter（VSI） system, and then selected vectors from the maximum subset and a set of vectors from the intermediate subset to form 18 intermediate vectors, by which a novel nine-phase SVPWM control method was proposed. The novel SVPWM control method can be used to restrain common-mode voltage, improve the utilization ratio of the DC bus voltage, and reduce stator current harmonics. In order to verify the theory above, we established a multi-phase induction motor variable-frequency speed control system, which was controlled by three control strategies, namely, traditional vector SVPWM, feature vector SVPWM and middle vector SVPWM. Results show that, by using middle vector SVPWM control, commonmode of voltage the system is reduced by 1/3, the utilization ratio of the DC bus voltage is increased, and the stator harmonic current is restrained.

关 键 词：多相SVPWM 中间矢量 多相变频器 多相电机 共模电压 直流母线电压利用率 

分 类 号：TM76[电气工程—电力系统及自动化]