针对大功率逆变器输出特定间谐波的频谱搬迁PWM方法  

Spectrum Relocation PWM Method for High-power Inverter to Output Specific Interharmonics

作　　者：徐磊 谢杰[1] 张慧[1] 何怡刚 周锦涛 李其真 XU Lei;XIE Jie;ZHANG Hui;HE Yigang;ZHOU Jintao;LI Qizhen(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072

出　　处：《高电压技术》2022年第8期3155-3165,共11页High Voltage Engineering

基　　金：国家自然科学基金(51977161,51977153;51637004)。

摘　　要：针对大功率逆变器提出一种特定间谐波控制PWM方法,核心思想是利用信号的时移和相移特性产生频谱搬迁,选择性地将特定频率搬迁到目标间谐波频率。首先建立相移调制的数学模型,分析不同调制子周期和频谱搬迁量的相移调制机理,推导调制信号幅频特性,然后采用基于非对称SHE-PWM的选择性谐波控制,对特征谐波进行线性相移调制,同时消除其他相邻特征谐波。频谱搬迁PWM方法可以将基波或特征谐波搬迁到相邻的间谐波,抑制调制过程中的寄生间谐波,理论上最大频谱搬迁范围是-50~50 Hz。仿真和实验表明,开关频率低于1 kHz时基于非对称SHE-PWM的频谱搬迁PWM控制三相逆变器输出特定间谐波的效果较常规SPWM好,基于SVPWM的频谱搬迁PWM控制并网逆变器有较好的特定间谐波补偿效果。A pulse width modulation(PWM)method of specific interharmonic control is proposed for high-power inverters,whose main idea is to use time-shift and phase-shift characteristics of the signal to generate spectrum relocation,and to selectively relocate the specific frequency to the desired interharmonic frequency.Firstly,the mathematical model of phase-shifted modulation is established,the principle of phase-shifted modulation with different modulation sub-periods and amount of spectrum relocation are analyzed,and the amplitude-frequency characteristics of modulation signal are derived.Then,the selective harmonic control based on asymmetric SHE-PWM is used to perform linear phase-shifted modulation on characteristic harmonics and eliminate other adjacent characteristic harmonics at the same time.The spectrum relocation PWM method can be adopted to move the fundamental or characteristic harmonics to adjacent interharmonics and suppress the parasitic interharmonics.Theoretically,the maximum spectrum relocation range is-50~50 Hz.Simulations and experiments show that the spectrum relocation PWM based on asymmetric SHE-PWM is better than the conventional SPWM to control three-phase inverter output specific interharmonics at the switching frequency lower than 1 kHz,and the spectrum relocation PWM based on SVPWM controlling the grid-connected inverter has good specific interharmonic compensation performance.

关 键 词：相移调制 频谱搬迁 间谐波控制 脉冲宽度调制 逆变器 

分 类 号：TM464[电气工程—电器]