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To address the issue of harmonic concentration near fixed switching frequencies caused by high-speed switching actions in traditional PWM strategy, the random modulation strategies in the PMSM servo drive system are studied. On the basis of conventional RSF-PWM strategy, DRM-PWM strategy enhances EMC by introducing randomization of the zero-vector action time. However, this strategy struggles to balance EMI suppression effectiveness with system control performance. Subsequently, MARSF-SVPWM strategy is investigated, with a focus on comparing and analyzing the two modulation strategies. Compared to DRM-PWM strategy, MARSF-SVPWM strategy maintains overall spread spectrum range and average switching frequency while narrowing the distribution range of differences between adjacent switching frequencies, thereby further reducing harmonic peaks. Simulation and experimental results demonstrate that MARSF-SVPWM strategy achieves better harmonic dispersion performance compared to DRM-PWM, and maintains a lower impact on system control performance, optimizing the EMI suppression effect.

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为了解决传统脉宽调制(Pulse Width Modulation,PWM)策略由于高速开关动作导致在固定开关频率附近聚集大量谐波的问题,对永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)伺服驱动系统中的随机调制策略进行了研究。在常规随机开关频率调制(Random Switching Frequency PWM,RSF-PWM)的基础上,双随机调制策略(Dual Randomized Modulation PWM,DRM-PWM)通过引入零矢量作用时间的随机化,有效提升了电磁兼容性(Electromagnetic Compatibility,EMC)。然而,该策略在电磁干扰(Electromagnetic Interference,EMI)抑制效果与系统控制性能之间难以兼顾。为此,后续又对多平均开关RSF-PWM(Multi-Average Random Switching Frequency SVPWM,MARSF-SVPWM)策略进行了研究,并重点对两种调制策略进行了对比分析。相较于DRM-PWM策略,MARSF-SVPWM策略在保持整体扩频范围和平均开关频率不变的前提下,缩小了相邻开关频率差值的分布范围,从而进一步降低谐波峰值。仿真和试验结果表明,MARSF-SVPWM策略获得了优于DRM-PWM策略的谐波分散效果,并且对系统控制性能的影响维持在较低的水平,优化了EMI抑制效果。

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何静萱(2001—),女,硕士研究生,主要研究方向为伺服驱动控制与电磁干扰抑制。

杨磊(1982—),男,博士,高级工程师,主要研究方向为伺服电源技术。

黄玉平(1967—),男,研究员,主要研究方向为伺服系统设计技术。

朱家厅(1987—),男,高级工程师,主要研究方向为伺服控制驱动技术。

卜飞飞(1984—),男,博士,教授,主要研究方向为航空电源、伺服驱动、新能源发电等。

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何静萱(2001—),女,硕士研究生,主要研究方向为伺服驱动控制与电磁干扰抑制。

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何静萱(2001—),女,硕士研究生,主要研究方向为伺服驱动控制与电磁干扰抑制。

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杨磊(1982—),男,博士,高级工程师,主要研究方向为伺服电源技术。

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杨磊(1982—),男,博士,高级工程师,主要研究方向为伺服电源技术。

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朱家厅(1987—),男,高级工程师,主要研究方向为伺服控制驱动技术。

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卜飞飞(1984—),男,博士,教授,主要研究方向为航空电源、伺服驱动、新能源发电等。

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Application of permanent magnet synchronous motor in new energy vehicles[J]. Auto Time, 2023(1): 106-108., articleTitle=null, refAbstract=null), Reference(id=1190013618298126669, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, doi=null, pmid=null, pmcid=null, year=2025, volume=20, issue=1, pageStart=54, pageEnd=64, url=null, language=null, rfNumber=[2], rfOrder=2, authorNames=陈瑞, 吴悠, 杜荣华, journalName=电气工程学报, refType=null, unstructuredReference=陈瑞, 吴悠, 杜荣华, 等. 一种基于特征模型的永磁同步电机协调控制策略[J]. 电气工程学报, 2025, 20(1): 54-64., articleTitle=一种基于特征模型的永磁同步电机协调控制策略, refAbstract=null), Reference(id=1190013618377818446, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, doi=null, pmid=null, pmcid=null, year=2025, volume=20, issue=1, pageStart=54, pageEnd=64, url=null, language=null, rfNumber=[2], rfOrder=3, authorNames=CHEN Rui, WU You, DU Ronghua, journalName=Journal of Electrical Engineering, refType=null, unstructuredReference= CHEN Rui, WU You, DU Ronghua, et al. A coordinated control strategy for the permanent magnet synchronous motor based on the characteristic model[J]. Journal of Electrical Engineering, 2025, 20(1): 54-64., articleTitle=null, refAbstract=null), Reference(id=1190013618444927311, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, doi=null, pmid=null, pmcid=null, year=2013, volume=19, issue=1, pageStart=65, pageEnd=70, url=null, language=null, rfNumber=[3], rfOrder=4, authorNames=陈瑞焘, 项安, 刘青松, journalName=机电一体化, refType=null, unstructuredReference=陈瑞焘, 项安, 刘青松, 等. 基于SVPWM控制的永磁同步电机伺服系统设计与仿真[J]. 机电一体化, 2013, 19(1): 65-70., articleTitle=基于SVPWM控制的永磁同步电机伺服系统设计与仿真, refAbstract=null), Reference(id=1190013618499453264, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, doi=null, pmid=null, pmcid=null, year=2013, volume=19, issue=1, pageStart=65, pageEnd=70, url=null, language=null, rfNumber=[3], rfOrder=5, authorNames=CHEN Ruitao, XIANG An, LIU Qingsong, journalName=Mechatronics, refType=null, unstructuredReference= CHEN Ruitao, XIANG An, LIU Qingsong, et al. Designed and simulation of PMSM based on the SVPWM control method[J]. 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Advanced pulse width modulation for modern inverters[D]. 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Study on common mode electromagnetic interference characteristics and suppression strategy in PMSM SiC drive sys-tem[D]. Chongqing: Chongqing University, 2022., articleTitle=null, refAbstract=null), Reference(id=1190013619111821656, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, doi=null, pmid=null, pmcid=null, year=2019, volume=35, issue=1, pageStart=607, pageEnd=618, url=null, language=null, rfNumber=[8], rfOrder=13, authorNames=ZHANG Wentao, XU Yongxiang, HUANG Huidong, journalName=IEEE Transactions on Power Electronics, refType=null, unstructuredReference= ZHANG Wentao, XU Yongxiang, HUANG Huidong, et al. Vibration reduction for dual-branch three-phase permanent magnet synchro-nous motor with carrier phase-shift technique[J]. 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Research on noise reduction strategy of six phase PMSM for underwater propulsion based on random modulation[D]. Zibo: Shandong University of Technology, 2020., articleTitle=null, refAbstract=null)], funds=[Fund(id=1190013617903862089, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, awardId=2023M024052001, language=CN, fundingSource=航空科学基金(2023M024052001), fundOrder=null, country=null), Fund(id=1190013617975165258, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, awardId=SJCX24_0135, language=CN, fundingSource=江苏省研究生实践创新计划项目(SJCX24_0135), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1190013614032519428, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, xref=null, ext=[AuthorCompanyExt(id=1190013614045102341, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585007548031980, companyId=1190013614032519428, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1. 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U αα轴电压分量; U ββ轴电压分量; U r e f—参考电压矢量。

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T s a m p—采样周期; T s w—开关周期; Δ t—随机化的延迟时间。

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永磁伺服驱动系统高次谐波抑制随机调制策略比较分析
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何静萱 1 , 杨磊 2, 3 , 黄玉平 2, 3 , 朱家厅 2, 3 , 卜飞飞 1
导弹与航天运载技术(中英文) | 先进伺服技术专栏 2025,48(4): 18-25
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导弹与航天运载技术(中英文) | 先进伺服技术专栏 2025, 48(4): 18-25
永磁伺服驱动系统高次谐波抑制随机调制策略比较分析
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何静萱1, 杨磊2, 3, 黄玉平2, 3, 朱家厅2, 3, 卜飞飞1
作者信息
  • 1.南京航空航天大学自动化学院,南京,210016
  • 2.北京精密机电控制设备研究所,北京,100076
  • 3.控制执行机构技术创新中心,北京,100076
  • 何静萱(2001—),女,硕士研究生,主要研究方向为伺服驱动控制与电磁干扰抑制。

    杨磊(1982—),男,博士,高级工程师,主要研究方向为伺服电源技术。

    黄玉平(1967—),男,研究员,主要研究方向为伺服系统设计技术。

    朱家厅(1987—),男,高级工程师,主要研究方向为伺服控制驱动技术。

    卜飞飞(1984—),男,博士,教授,主要研究方向为航空电源、伺服驱动、新能源发电等。

Comparative Analysis of Random Modulation Strategies for High-order Harmonic Suppression in Permanent Magnet Servo Drive Systems
Jingxuan HE1, Lei YANG2, 3, Yuping HUANG2, 3, Jiating ZHU2, 3, Feifei BU1
Affiliations
  • 1. Nanjing University of Aeronautics and Astronautics, College of Automation Engineering, Nanjing, 210016
  • 2. Beijing Institute of Precision Mechatronics and Controls, Beijing, 100076
  • 3. Innovation Center for Control Actuators, Beijing, 100076
出版时间: 2025-08-25 doi: 10.7654/j.issn.2097-1974.20250402
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为了解决传统脉宽调制(Pulse Width Modulation,PWM)策略由于高速开关动作导致在固定开关频率附近聚集大量谐波的问题,对永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)伺服驱动系统中的随机调制策略进行了研究。在常规随机开关频率调制(Random Switching Frequency PWM,RSF-PWM)的基础上,双随机调制策略(Dual Randomized Modulation PWM,DRM-PWM)通过引入零矢量作用时间的随机化,有效提升了电磁兼容性(Electromagnetic Compatibility,EMC)。然而,该策略在电磁干扰(Electromagnetic Interference,EMI)抑制效果与系统控制性能之间难以兼顾。为此,后续又对多平均开关RSF-PWM(Multi-Average Random Switching Frequency SVPWM,MARSF-SVPWM)策略进行了研究,并重点对两种调制策略进行了对比分析。相较于DRM-PWM策略,MARSF-SVPWM策略在保持整体扩频范围和平均开关频率不变的前提下,缩小了相邻开关频率差值的分布范围,从而进一步降低谐波峰值。仿真和试验结果表明,MARSF-SVPWM策略获得了优于DRM-PWM策略的谐波分散效果,并且对系统控制性能的影响维持在较低的水平,优化了EMI抑制效果。

伺服驱动系统  /  空间矢量脉宽调制  /  双随机调制  /  多平均开关调制  /  电磁干扰

To address the issue of harmonic concentration near fixed switching frequencies caused by high-speed switching actions in traditional PWM strategy, the random modulation strategies in the PMSM servo drive system are studied. On the basis of conventional RSF-PWM strategy, DRM-PWM strategy enhances EMC by introducing randomization of the zero-vector action time. However, this strategy struggles to balance EMI suppression effectiveness with system control performance. Subsequently, MARSF-SVPWM strategy is investigated, with a focus on comparing and analyzing the two modulation strategies. Compared to DRM-PWM strategy, MARSF-SVPWM strategy maintains overall spread spectrum range and average switching frequency while narrowing the distribution range of differences between adjacent switching frequencies, thereby further reducing harmonic peaks. Simulation and experimental results demonstrate that MARSF-SVPWM strategy achieves better harmonic dispersion performance compared to DRM-PWM, and maintains a lower impact on system control performance, optimizing the EMI suppression effect.

servo drive system  /  space vector pulse width modulation  /  DRM-PWM  /  MARSF-SVPWM  /  electromagnetic interference
何静萱, 杨磊, 黄玉平, 朱家厅, 卜飞飞. 永磁伺服驱动系统高次谐波抑制随机调制策略比较分析. 导弹与航天运载技术(中英文), 2025 , 48 (4) : 18 -25 . DOI: 10.7654/j.issn.2097-1974.20250402
Jingxuan HE, Lei YANG, Yuping HUANG, Jiating ZHU, Feifei BU. Comparative Analysis of Random Modulation Strategies for High-order Harmonic Suppression in Permanent Magnet Servo Drive Systems[J]. Missiles and Space Vehicles, 2025 , 48 (4) : 18 -25 . DOI: 10.7654/j.issn.2097-1974.20250402
电机伺服驱动系统可以实现高精度的运动控制,被大量应用于机器人、数控机床半导体设备、医疗仪器等领域1。随着电机伺服驱动系统的规模化应用进程加速,其面临着日益严苛的动态响应特性和稳态控制精度要求。而永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)凭借着高效率、高功率密度、高精度和高可靠性的优势2,已经成为构建高性能伺服驱动系统的优选执行机构,尤其是在需要快速动态响应速度、精密定位以及运行稳定的工业场合中展现了显著的技术优势。
在PMSM伺服驱动系统中,常规脉宽调制(Pulse Width Modulation,PWM)策略通常基于固定的开关频率生成控制逆变器的特定脉冲3。由于该调制方式固定的开关频率,致使输出电压、电流的高频段中存在大量高次谐波分量。这些谐波分量主要分布在开关频率及其整数倍频处,通过传导、辐射、感应耦合的方式进行传播,引发伺服驱动系统对周围设备产生高强度电磁干扰(Electromagnetic Interference,EMI),从而影响电磁兼容(Electromagnetic Compatibility,EMC)性能。值得注意的是,PWM实现过程中,功率器件的高速开关过程会形成高频电压电流脉冲信号,构成伺服系统EMI的主要干扰源,影响设备的电磁兼容性能4。随着高功率密度与集成化技术的深度发展,伺服系统内部呈现出高度的功能模块集成化特征。在此条件下,各类电子装置与机械结构高密度地布设在有限空间内,导致系统内部EMC环境复杂度显著提升。作为伺服驱动系统的核心部件,PWM逆变器在工作过程中产生的传导干扰,不仅会劣化伺服系统的动态响应速度与定位精度,更可能引发控制单元的信号失真与误动作,进而降低整机设备的运行效能及可靠性5-6。因此,针对伺服系统电磁干扰问题的抑制策略优化具有重要的工程价值,亟待提出更加有效的解决方案。
针对PMSM伺服驱动系统传导电磁干扰,目前,传导干扰的抑制策略主要分为硬件措施和软件措施7。硬件抑制策略通过引入无源/有源EMI滤波器、新型拓扑结构降低系统共模电压的输出8-10。文献[11]提出了一种电压传感电流补偿有源EMI滤波器,通过将测量到的共模电压与共模电压阻抗网络结合生成共模反向电流,从而抑制直流侧共模干扰,省去了补偿变压器结构,最终优化滤波器提升功率密度。文献[12]对传统三相四桥臂逆变器采用的三维空间矢量脉宽调制策略进行了改进,试验验证了该调制方法不仅可以改善输出电压的谐波性能,还能提升三相四桥臂逆变器驱动不同类型负载的能力。但是,这些硬件抑制方案都依托于硬件改造,不仅带来较高的成本,其设计过程还需针对不同系统进行定制化参数计算及结构优化,导致系统适用性受限。此外,滤波器的引入会显著增加系统体积与重量,进而降低功率密度。
相较之下,基于软件的谐波抑制方案通过改进型调制策略实现。该方案无需硬件改造、具有实施成本低、适用性强的优势。目前,基于空间矢量脉宽调制(Space Vector Pulse Width Modulation,SVPWM)策略的随机扩频PWM策略是受到关注较多的扩频策略。扩频PWM策略依据信号类型可以分为随机调制与混沌调制两类。随机PWM采用概率分布的随机序列当作频率控制信号,实际应用中一般通过软件设计采用特定算法生成随机数从而产生随机信号。混沌PWM则通过系统产生的混沌信号当作调制源,但实现方法较为复杂,并且可能出现低开关频率时采用混沌PWM导致输出信号畸变等情况,还需进一步深入研究。
随机PWM技术的核心实现机制在于对开关函数参数进行随机化处理。通过这种方式,可以生成两种随机PWM技术:随机开关频率调制(Random Switching Frequency PWM,RSF-PWM)和随机脉冲位置调制(Random Pulse Position PWM,RPP-PWM)。利用随机脉冲位置PWM,能够有限度地减少开关频率及其整数倍数处高次谐波的影响。但在较高的开关频率和调制比条件下,这两种方法受限于随机化程度不足,在谐波分布优化及电磁干扰抑制上的提升作用较有限。而对二者进行结合的双随机调制(Dual Randomized Modulation PWM,DRM-PWM)策略虽然同时兼顾两种单一随机调制方式的优势13-16,但开关频率变化范围仍然是影响DRM-PWM策略谐波分散效果的主导因素。在PMSM伺服驱动系统中,扩频范围较窄时,RSF-PWM 谐波分散效果不明显,从而导致系统传导EMI抑制效果不理想;而扩频范围过大会对PMSM伺服系统控制性能造成负面影响。因此,需要对RSF-PWM策略进行改进,在保持扩频范围较窄条件下,使其高次谐波分散效果得到优化,进一步削弱高次谐波的幅值,从而减小对其他设备产生的电磁干扰强度,提升PMSM伺服驱动系统的电磁兼容性能。
为了在较窄的扩频范围条件下得到理想的高次谐波频谱,本文首先对两种随机PWM的原理进行分析,对比了DRM-PWM策略和多平均开关频率RSF-PWM(Multi-Average Random Switching Frequency SVPWM,MARSF-SVPWM)策略的实现过程。其中,MARSF-SVPWM在扩频范围相同的情况下通过降低相邻开关频率差值,进一步抑制了高次谐波。最后结合仿真分析和试验验证,证明了相同扩频范围条件下,MARSF-SVPWM可获得比DRM-PWM更好的谐波分散效果,同时不会对系统控制性能造成更大影响。
永磁同步电机的PWM调制方式主要有载波交截正弦脉宽调制(Sinusoidal Pulse Width Modulation,SPWM)和SVPWM调制。SPWM调制策略是PMSM为常用的调制方法之一,它利用输出的信号作为调制波,以高频三角波作为载波,通过二者波形的交点得到桥臂中功率器件的开通关断情况。SPWM调制策略虽然实现简单,可是仍面临输出电流谐波畸变率较高且直流电压利用率低等问题。
SVPWM调制技术的核心原理在于每个开关周期内,通过对基本电压矢量进行线性组合以逼近目标参考矢量,调控逆变器开关器件通断时序,从而生成圆形旋转磁场。相较于SPWM,SVPWM可以改善电流谐波性能,提高直流电压利用率。因此,后续本文抑制伺服驱动系统传导EMI的研究将基于SVPWM策略展开。
SVPWM调制技术主要利用操控开关器件的不同组合,切换空间电压矢量,进而获得一个圆形的旋转磁场,从而得到较理想的正弦电压。三相两电平逆变器拓扑如图1所示。
U D C为直流母线电压,三相两电平逆变器有6个功率开关管。设置 S = S A , S B , S C,其中, S X = 1 X = A , B , C表示相应桥臂上管导通、下管关断; S X = 0 X = A , B , C表示相应桥臂上管关断、下管导通。根据开关状态不同,逆变器各相输出电压 U A U B U C,也就是PMSM定子三相电压,可表示为
U A = S A - 1 3 ( S A + S B + S C ) U D C U B = S B - 1 3 ( S A + S B + S C ) U D C U C = S C - 1 3 ( S A + S B + S C ) U D C
图1的逆变器包含8种开关状态,包括六个幅值为 2 U D C / 3的有效矢量状态和2个零矢量状态 U 0 U 7。将上述基本矢量投影至复平面中,可得到如图2所示的空间矢量图。其中,6个有效矢量将复平面分为6个扇区。
对位于特定扇区中任一参考电压矢量,可以采用该扇区两个相邻有效矢量与零矢量的线性组合实现其合成。通过控制有效矢量的作用时长可以改变合成矢量的幅值。以合成矢量在扇区Ⅰ中为例,可以利用基本矢量 U 4 U 6进行合成。
在传统SVPWM策略下高次谐波聚集在开关频率及其整数倍频率点附近频带内,且随着倍数增加,频带内谐波幅值会整体降低。
因此,当PMSM伺服驱动系统采用SVPWM策略时,其输出电压、电流的频谱中会在开关频率及其整数倍附近较窄的频带内聚集大量高次谐波能量,形成的谐波尖峰会对PMSM伺服驱动系统产生传导EMI干扰,甚至影响系统及周围设备正常工作。
随机开关延时的方法,也就是在传统固定频率PWM策略的基础上,引入按特定规律分布的随机变量,使得RSF-PWM策略中的开关频率不再是固定不变的。因此,原先聚集在开关频率及其倍频处的能量可以被分散在更宽的频段内,有助于降低单一频带能量峰值。
将采样时刻和开关时刻分成两个互不干扰的部分,传统固定频率PWM策略按照采样时刻进行开关动作。而RSF-PWM策略保证采样频率不变,在一定范围内,对开关时刻进行随机化处理,然后执行开关操作,如图3所示。
由于采样频率是固定值,因此必须在每个采样周期内固定时间完成采样。但是采取RSF-PWM策略时,不再按照采样时刻进行开关动作,而是延时 Δ t。为确保每个采样周期内总有一次开关脉冲信号可以平稳执行,延迟时间 Δ t需要满足:
0 Δ t < T s a m p
每次延迟的时间都是不同的,通过随机数和采样周期,随机延时 Δ t可表示为
Δ t = r a n d [ 0 1 ] × T s a m p
式中 r a n d [ 0 1 ]为一个在 [ 0 1 ]范围内均匀分布的随机数。虽然所有开关动作的操作时间都是不确定的,但是可以通过计算邻近的两个开关动作的时间差值,从而能够获得第n个开关周期 T s w的表达式:
T s w n = T s a m p + Δ t n - Δ t n - 1
通过式(4)能够获得随机化后变化范围为 [ 0 2 T s a m p ]的开关周期。开关频率 f s w也在区间 [ 0.5 f s a m p )内随机变化, f s a m p为采样频率。随着开关频率提升,随机频带加宽,有利于降低输出电流中谐波成分。但是开关频率越高时,开关器件损耗也越大。所以,需要限定一个开关频率的最大值,即:
f s w ( n ) = f s w _ m a x
式中 f s w _ m a x为开关频率的最大值。因此,能够得到开关频率随机变化的范围:
0.5 f s a m p f s w < f s w - m a x
由于SVPWM调制合成电压的幅值仅与有效矢量作用时间有关,与脉冲位置无关。而一种有效的改变脉冲位置的方法就是调整零矢量作用时间,使其随机化分配。传统SVPWM策略中,两个零矢量作用时长均等划分,但是在随机零矢量PWM策略中,开关频率和占空比保持不变,两个零矢量在开关周期内随机对称地分布。在总作用时间保持恒定的条件下,调整位于开头末尾的零矢量和位于中间的零矢量的作用时间,使其不再相等,如图4所示。调制过程中,零矢量总作用时间和有效电压矢量作用时间均维持不变,因此逆变器输出电压也不变17
依据下式能够随机分配两个零矢量的作用时间:
T Z 1 = R i × T 0 T Z 2 = T 0 - T Z 1
式中 T Z 1 T Z 2分别为零矢量 U 0 U 31的作用时间; R i是一个平均分布在[0,1]上的随机数。当生成的随机数为0.5时,即为传统SVPWM策略。
从上文的分析可以看出,在给定采样频率的前提下,利用随机开关延时可以实现开关频率随机化,不仅不影响控制系统性能,同时还会对开关频率倍频处的高次谐波幅值产生抑制,使原本聚集的谐波能力更加均匀;通过对零矢量位置的随机对称分布,实现了在不改变输出电压的前提下,提高了电压频谱分布的均匀性和连续性。将二者进行有机结合,即可得到DRM-PWM方法,同时兼具两者优点,大幅提高输出电压的高频特性。因此,结合随机开关延时和随机零矢量分配这两种随机方法,能够更好地解决更多电磁兼容问题。
虽然DRM-PWM策略的高次谐波分散效果相对RSF-PWM策略得到了进一步提升,但是在DRM-PWM策略中,扩频范围大小对高次谐波分散能力起决定性作用,当扩频范围较窄时,谐波分散效果不明显,从而导致系统EMI抑制效果不理想。但当扩频范围过大时,则会影响PMSM伺服驱动系统其他控制性能。因此,需要对RSF-PWM策略进行改进,使其在较窄的扩频范围条件下,具有较好的谐波分散效果,实现较理想的EMI抑制效果。
由于扩频范围相同时,缩小相邻开关周期的开关频率值差值分布范围,也能降低高次谐波幅值。因此,MARSF-SVPWM策略将原扩频范围平均划分为n个频段,每个频段分别对应新的平均开关频率,并设置开关频率切换周期为 T b,每经过 T b / n时间就切换一次开关频率变化频段。这样在保持整体扩频范围和平均开关频率不变的前提下,缩小相邻开关周期的开关频率值差值分布范围,进一步优化高次谐波分散效果。
采用传统RSF-PWM时,开关频率以平均开关频率 f s 0为中心,在两侧 Δ f范围内不断随机变化, Δ f表示RSF-PWM扩频范围大小。固定开关频率SVPWM输出信号频谱在开关频率及其整数倍附近聚集大量谐波。在时域与频域中能量守恒,总谐波能量不变,故RSF-PWM可以将集中的谐波能量分散到整个扩频范围内,谐波尖峰幅值就会降低。可以假设采用RSF-PWM策略时,每个开关周期内产生的谐波能量会在频谱上产生一个以该周期开关频率点为中心的高次谐波包络线,所有单个开关周期内的高次谐波能量叠加起来为总谐波能量分布情况。
基于上述分析,可以将RSF-PWM策略在开关频率附近高次谐波分布情况表示为如图5所示的谐波。随着时间变化,单个开关周期内产生的高次谐波包络线中心在开关频率变化范围 f s 0 - Δ f f s 0 + Δ f内随机平移,并最终叠加成总谐波能量。当扩频范围 Δ f较大时,单个开关周期内产生谐波能量包络线的中心点移动范围也较大,则谐波分散效果较为理想,传导EMI的抑制效果比较好。反之,当扩频范围较窄时,单个开关周期内产生谐波能量包络线的中心点移动范围较小,谐波分散效果较差,造成电磁噪声,影响系统的EMC。
RSF-PWM作用时,随着扩频范围增大,虽然输出信号高次谐波分散效果改善,但系统控制精确性和稳定性较差。扩频范围越大,RSF-PWM对PMSM伺服驱动系统控制性能的负面影响也就越大。为了降低对PMSM伺服系统控制性能的负面作用,选取扩频范围较小的RSF-PWM时,高次谐波分散效果较差,系统传导EMI发射值依然较高,影响系统EMC的提升。因此,传统RSF-PWM很难兼顾高次谐波分散效果和系统控制性能。
由上述分析可知,扩频范围较小时,传统RSF-PWM产生的传导EMI值较高,影响系统稳定运行。因此,可以在维持原有开关频率的前提下,通过将扩频范围分为 n个分频段,并为每个子频段配置独立的中心开关频率。由此,MARSF-SVPWM策略可在有限扩频范围的前提下优化高次谐波分布特性。
n = 4时为例,对MARSF-SVPWM开关频率值随时间变化情况作具体说明。保持传统RSF-PWM平均开关频率 f s 0和扩频范围 Δ f不变,当n值取4时,每经过 T b / 4时间,平均开关频率就按 f s 1 f s 2 f s 3 f s 4顺序切换一次,开关频率在每个阶段的平均开关频率两边 Δ f / 4范围内随机变化,在每个平均开关频率周期 T b内重复上述过程。 f s 1 f s 2 f s 3 f s 4可以表示为
f s 1 = f s 0 - 3 4 Δ f f s 2 = f s 0 - 1 4 Δ f f s 3 = f s 0 + 1 4 Δ f f s 4 = f s 0 + 3 4 Δ f
MARSF-SVPWM开关频率附近高次谐波分布如图6所示。如图6所示,为使MARSF-SVPWM 策略作用原理更加明确,同样在 n = 4时对其开关频率附近高次谐波分布情况进行分析。采用MARSF-SVPWM策略后,单个开关周期内产生的谐波能量包络线中心将根据时间变化在不同频段内平移,且平移范围互不重叠。在整体扩频范围保持相同的情况下,总谐波能量的包络线中心由之前的 f s 0变化为 f s 1 f s 2 f s 3 f s 4,此时, f s 1 f s 2 f s 3 f s 4处谐波能量幅值会低于采用传统RSF-PWM时 f s 0处谐波能量幅值。因此,采用 MARSF-SVPWM总谐波能量的最高幅值得到降低,在相同的扩频范围下,实现了高次谐波的进一步分散。
在仿真软件中进行PMSM伺服驱动系统建模。选择4对极永磁同步电机,直流母线电压为28 V,额定转矩为1.27 N·m,线电阻为0.13 Ω,线电感为0.15 mH,额定功率为0.4 kW,转矩常数为0.06 (N·m)/A,转子惯量为0.28×10-4 kg·m2,平均开关频率 f s 0为10 kHz,转速为1 000 r/min。在负载转矩为0.5 N·m和1 N·m时,对传统SVPWM、扩频范围为±10%([9,11] kHz)的DRM-PWM和MARSF-SVPWM进行仿真,对上文分析扩频范围对高次谐波分散效果产生影响进行验证,仿真结果如图7图8所示。
图7图8可知,同样在扩频范围 ± 10 %的条件下,采用DRM-PWM策略和MARSF-SVPWM策略得到的频谱图均优于采用固定开关频率SVPWM时得到的频谱图。可以看到原先分布在开关频率及其整数倍次频率附近的高次谐波被分散,谐波峰值降低。但是相比于DRM-PWM策略,MARSF-SVPWM策略对高次谐波的削弱效果更强。而在较小的 ± 10 %扩频范围的情况下,MARSF-SVPWM策略对系统的负面影响可以维持在较低的程度,具有一定优越性。
为了进一步验证不同调制策略的谐波分散效果以及上述分析的正确性,用PMSM伺服驱动系统试验平台,分别采取传统 SVPWM策略、DRM-PWM策略和MARSF-SVPWM策略,进行试验对比分析。利用示波器分析PMSM伺服驱动系统定子相电流的高次谐波频谱,对比不同调制策略的高次谐波抑制能力。在此基础上,观测不同调制策略下的相电流波变化,评估不同调制策略对PMSM性能产生的影响程度。图9为试验平台实物图,主要包含磁粉制动器、PMSM、联轴器和扭矩传感器。PMSM采用的是拓达公司生产的SDGA-04C1BD24型号伺服电机,其主要参数与仿真参数一致,为4对极的表贴式永磁同步电机,直流母线电压为28 V,转速为1 000 r/min,转矩为0.5 N·m,扩频范围为 ± 10 %。传感器采用的是蚌埠大洋传感器公司的DYN-200型号的动态扭矩传感器,实时监测和反馈电机的运行状态,包括扭矩和转速等关键参数。对传统SVPWM、扩频范围为±10%([9,11] kHz)的DRM-PWM和MARSF-SVPWM进行试验,试验结果如图10所示。
基于图10的试验数据分析,在0.5 N·m负载条件下,针对采用不同调制策略的电流波形及其频谱展开对比研究。试验结果表明,采用传统SVPWM时,相电流频谱在开关频率的倍频处呈现出明显的谐波聚集现象。相较于传统SVPWM,采用DRM-PWM策略后,PMSM伺服驱动系统相电流频谱中的高次谐波明显削弱。而MARSF-SVPWM策略对高次谐波的削弱效果比DRM-PWM策略更强。由上述试验结果可知,相较于DRM-PWM策略,MARSF-SVPWM策略可以在保持扩频范围较窄的情况下,进一步削弱谐波尖峰,获得较为理想的谐波分散效果同时对相电压波形质量造成轻微负面影响。
针对PMSM伺服驱动系统,本文对DRM-PWM策略及MARSF-SVPWM策略的原理及实现过程进行了分析,并重点对比了两种调制策略。相较于DRM-PWM策略围绕单一的平均开关频率随机变化,MARSF-SVPWM策略将完整的频率变化范围划分为四个分频段,并在各频段内实现开关频率的随机变化,在维持扩频范围不变的情况下,抑制了高次谐波的进一步分散。接着搭建仿真模型与实物平台,将原有的固定开关频率SVPWM策略、DRM-PWM策略与MARSF-SVPWM策略进行对比。通过仿真与试验验证,在同样的扩频范围条件下,MARSF-SVPWM策略的谐波分散效果明显优于DRM-PWM,验证了该策略的优越性。后续研究可以开展系统的电磁兼容特性测试,深入探究高次谐波抑制效果与电磁兼容性能提升之间的内在关联,通过多维度测试数据开展综合评价。
  • 航空科学基金(2023M024052001)
  • 江苏省研究生实践创新计划项目(SJCX24_0135)
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2025年第48卷第4期
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doi: 10.7654/j.issn.2097-1974.20250402
  • 接收时间:2025-04-09
  • 首发时间:2025-10-27
  • 出版时间:2025-08-25
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  • 收稿日期:2025-04-09
  • 修回日期:2025-05-24
基金
航空科学基金(2023M024052001)
江苏省研究生实践创新计划项目(SJCX24_0135)
作者信息
    1.南京航空航天大学自动化学院,南京,210016
    2.北京精密机电控制设备研究所,北京,100076
    3.控制执行机构技术创新中心,北京,100076
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