摘要
传统SVPWM由于其电压利用率高等优点被广泛应用在电机控制中,然而随着开关频率的降低,输出电流纹波会加剧,其将面临系统损耗增加、输出转矩脉动等问题,对系统稳定性和动态性能带来不利影响。针对这一问题,本文提出了一种基于改进混合PWM的电流纹波抑制策略。通过构建静止坐标系下的电流纹波矢量模型,分析了低开关频率下的纹波加剧的原因。通过分析电压矢量作用时间和顺序与电流纹波之间的关系,选取了两种能够抑制电流纹波的开关序列。通过在线计算不同序列的电流纹波并根据结果切换输出,实现了对低开关频率下电流纹波的有效抑制。搭建了实物实验平台,实践验证了该抑制策略的有效性和可行性。
SVPWM is widely used in motor control due to its advantages such as high voltage utilization.However,as the switching frequency decreases,the output current ripple intensifies,leading to issues like increased system losses and torque ripple,which adversely affect system stability and dynamic performance.To address this problem,this paper proposed a current ripple suppression strategy based on an improved hybrid PWM.By constructing a current ripple vector model in the stationary coordinate system,the reasons for the intensified ripple at low switching frequencies were analyzed.Through an examination of the relationship between voltage vector action time,sequence,and current ripple,two switching sequences capable of suppressing current ripple were selected.Effective suppression of current ripple at low switching frequencies was achieved by calculating the current ripple for different sequences online and switching the output based on the results.A physical experiment platform was established to validate the effectiveness and feasibility of the suppression strategy in practice.
作者
王永棋
韩剑波
刘亚男
刘轶
骆攀
玉佰强
WANG Yongqi;HAN Jianbo;LIU Yanan;LIU Yi;LUO Pan;YU Baiqiang(Key Laboratory of Nuclear Reactor System Design Technology,China Nuclear Power Research and Design Institute,Chengdu 610213,China;The Sixth Army Representative Room of the Beijing Bureau in Beijing,Beijing 100094,China;Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《微电机》
2024年第6期22-29,共8页
Micromotors
