一种120°坐标系下的快速SVPWM过调制算法  

Fast SVPWM overmodulation algorithm based on 120°coordinate system

作　　者：王健 章玮[1] WANG Jian;ZHANG Wei(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电机与控制学报》2021年第5期19-25,共7页Electric Machines and Control

基　　金：浙江省自然科学基金(LY19E070005)。

摘　　要：针对传统过调制计算量大的问题,结合最小相位误差原则提出了一种120°坐标系下的快速SVPWM过调制算法。首先,针对传统SVPWM算法步骤多和计算冗余的问题,引入120°非正交坐标系,取消了扇区判断,计算速度更快;在此基础上,为了避免傅里叶分析计算保持角和控制角消耗大量计算资源,根据最小相位误差原则通过三相上桥臂的开通时间计算调整参考电压矢量的幅值和相位,并在120°坐标系下推导了算法表达式;最后,给出了过调制区域的统一求解模型并分析了输出电压调制比和谐波畸变率与参考电压矢量幅值的关系。通过实验验证该过调制算法,结果表明,新算法在保留了优秀的谐波抑制效果的同时能明显减少计算量。Aiming at the problem of large amount of calculation in traditional overmodulation, a fast SVPWM over-modulation algorithm in 120° coordinate system was proposed based on the principle of minimum phase error. Firstly, in order to solve the problem of multi-step and redundant calculation in traditional SVPWM algorithm, 120° non orthogonal coordinate system was introduced, which cancels the sector judgment and makes the calculation faster. On this basis, in order to avoid consuming a lot of computing resources in Fourier analysis to calculate the holding angle and control angle, according to the principle of minimum phase error, the amplitude and phase of the reference voltage vector were adjusted by calculating the opening time of the three-phase upper arm, and the algorithm expression was derived in 120° coordinate system. Finally, the unified solution model of over modulation region was given, and the relationship between the modulation ratio of output voltage and harmonic distortion rate and the amplitude of reference voltage vector was analyzed. The experimental results show that the new algorithm retains the excellent harmonic suppression effect and can significantly reduce the amount of calculation.

关 键 词：两电平逆变器 120°坐标系 空间矢量脉宽调制 过调制 计算速度 谐波畸变率 

分 类 号：TM464[电气工程—电器]