摘要
【目的】直流母线采样法因采用脉宽调制移相来补偿电流重构盲区会导致相电流引入额外谐波。针对此问题,本文提出了一种基于多支路采样法的电流重构方案。【方法】理论分析了直流母线采样法和多支路采样法的原理以及电流重构盲区的成因,并基于Matlab/Simulink对两种方案进行仿真对比分析。【结果】仿真结果表明,多支路采样法有效避免了直流母线采样法存在的低调制比区域和扇区边界盲区,降低了电流谐波含量,提高了电流重构的准确性。在电机转速为60 r/min时进行了试验,重构电流最大误差小于0.5 A。【结论】试验结果验证了所提多支路采样法电流重构方案的有效性和可行性。
[Objective]The DC bus sampling method introduces additional harmonics into the phase current due to the use of pulse width modulation(PWM)phase shifting to compensate for the current reconstruction dead zone.To solve this problem,a phase current reconstruction scheme based on the multiple-branch sampling method was proposed.[Method]A theoretical analysis of the DC bus sampling method and the multiple-branch sampling method was conducted,focusing on the causes of the current reconstruction dead zone.Matlab/Simulink simulations were used for a comparative analysis of both methods.[Results]Simulation results indicated that the multiple-branch sampling method effectively avoided the dead zones in the low modulation index region and sector boundaries present in the DC current sampling method,reduced the harmonic content in the current,and enhanced the accuracy of current reconstruction.Experiments conducted at a motor speed of 60 r/min demonstrated that the maximum error in the reconstructed current was less than 0.5 A.[Conclusion]The experimental results verified the effectiveness and feasibility of the proposed multiple-branch sampling method for current reconstruction.
作者
黄玲林
王爽
李志伟
HUANG Linglin;WANG Shuang;LI Zhiwei(School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China)
出处
《电机与控制应用》
2024年第11期11-20,共10页
Electric machines & control application
关键词
直流母线采样
电流重构
脉宽调制
多支路采样法
DC bus sampling
current reconstruction technology
pulse width modulation
multiple-branch sampling method
