基于随机载波脉冲宽度调制的变换器群超高次谐波抑制机理  

Principle of Supraharmonic Elimination Based on Random Carrier Sinusoidal Pulse Width Modulation for Converter Clusters

作　　者：杨嘉伟 易杨 姜浩 朱林 姚志伟 YANG Jiawei;YI Yang;JIANG Hao;ZHU Lin;YAO Zhiwei(DEC Academy of Science and Technology Co.,Ltd.,Chengdu 611731,China;Fujian Key Laboratory of New Energy Generation and Power Conversion,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]东方电气集团科学技术研究院有限公司,四川成都611731 [2]福建省新能源发电与电能变换重点实验室(福州大学),福建福州350108

出　　处：《中国电力》2023年第11期160-167,共8页Electric Power

基　　金：国家自然科学基金资助项目(51777035)。

摘　　要：基于随机载波正弦脉冲宽度调制技术的原理,建立在随机载波正弦脉冲宽度调制下电压源变换器输出超高次谐波模型,研究载波频率随机性与超高次谐波幅值和相位随机性之间的关系。超高次谐波频谱分布更宽,且幅值近似服从正态分布特征,载波随机性导致超高次谐波相位随机性,并基本呈现均匀分布特征。利用此特征,研究载波未同步的变换器群发射超高次谐波的超高次谐波叠加相消原理,提出基于随机载波正弦脉冲宽度调制的变换器群超高次谐波抑制机理,以达到广泛频段内超高次谐波抑制的目的。仿真和实验结果表明,特定次超高次谐波幅值及相位特征符合理论分析,该超高次谐波抑制机理可行有效。It is established by the voltage source converter supraharmonic model based on the principle of RC-SPWM.The relationship among the carrier randomness and amplitude as well as the phase randomness of supraharmonic is explored.The supraharmonic spectrum is distributed over a wider frequency range,and the amplitude of each supraharmonic approximates a normal distribution feature.The phases of supraharmonic approximate a uniform distribution feature due to the randomness of the carrier wave.The mechanism for supraharmonic elimination for converter clusters without carrier synchronization based on RCSPWM is proposed,where the purpose of suppressing supraharmonic in a wide frequency range can be achieved.The simulation and experimental results demonstrate the effectiveness of the proposed supraharmonic elimination mechanism.

关 键 词：并网逆变器 电能质量 超高次谐波抑制 随机载波正弦脉冲宽度调制 

分 类 号：TM46[电气工程—电器]