Speed Regulation Method Using Genetic Algorithm for Dual Three-phase Permanent Magnet Synchronous Motors

Dual three-phase Permanent Magnet Synchronous Motor(DTP-PMSM)is a nonlinear,strongly coupled,high-order multivariable system.In today’s application scenarios,it is difficult for traditional PI controllers to meet the requirements of fast response,high accuracy and good robustness.In order to improve the performance of DTP-PMSM speed regulation system,a control strategy of PI controller based on genetic algorithm is proposed.Firstly,the basic mathematical model of DTP-PMSM is established,and the PI parameters of DTP-PMSM speed regulation system are optimized by genetic algorithm,and the modeling and simulation experiments of DTP-PMSM control system are carried out by MATLAB/SIMULINK.The simulation results show that,compared with the traditional PI control,the proposed algorithm significantly improves the performance of the control system,and the speed output overshoot of the GA-PI speed control system is smaller.The anti-interference ability is stronger,and the torque and double three-phase current output fluctuations are smaller.

Research on Open-circuit Fault Tolerant Control of Six-phase Permanent Magnet Synchronous Machine Based on Fifth Harmonic Current Injection

This paper proposes a novel control approach for fault-tolerant control of dual three-phase permanent magnet synchronous motor(PMSM) under one-phase open-circuit fault.A modified six-phase static coordinate transformation matrix and an extended rotating coordinate transformation matrix are investigated considering the influence of the fifth harmonic space on fault-tolerant control. These mathematical models are further analyzed in the fundamental space and the fifth harmonic space after the fault and to eliminate the coupling between the d-q axis voltage equation in the fundamental wave space and the d-q axis voltage equation in the fifth harmonic space, a secondary rotation coordinate transformation matrix is proposed. To achieve the purpose of reducing torque ripple, the fault-tolerant control method proposed in this paper not only takes the minimum copper loss as the constraint condition, but also injects the fifth harmonic current. The experimental result of current and torque is used to verify the accuracy of fault-tolerant control.

Current Loop Disturbance Suppression for Dual Three Phase Permanent Magnet Synchronous Generators Based on Modified Linear Active Disturbance Rejection Control

A modified four-dimensional linear active disturbance rejection control(LADRC)strategy is proposed for a dual three-phase permanent magnet synchronous generator(DTP-PMSG)system to reduce cross-coupling between the d and q axis currents in the d-q subspace and harmonic currents in the x-y subspace.In the d-q subspace,the proposed strategy uses a model-based LADRC to enhance the decoupling effect between the d and q axes and the disturbance rejection ability against parameter variation.In the x-y subspace,the 5th and 7th harmonic current suppression abilities are improved by using quasi-resonant units parallel to the extended state observer of the traditional LADRC.The proposed modified LADRC strategy improved both the steady-state performance and dynamic response of the DTP-PMSG system.The experimental results demonstrate that the proposed strategy is both feasible and effective.

Electromagnetic Performance Prediction for the Symmetrical Dual Three-phase Surface-mounted PMSM under Open-phase Faults Based on Accurate Subdomain Model

The paper presents an accurate analytical subdomain model for predicting the electromagnetic performance in the symmetrical dual three-phase surface-mounted permanent magnet synchronous machine(PMSM)under open-phase faulty conditions.The model derivations are extended from previous accurate subdomain models accounting for slotting effects.Compared with most conventional subdomain models for traditional three-phase machines with nonoverlapping winding arrangement,the subdomain model proposed in this paper applied for the 24-slot/4-pole dual three-phase machine with symmetrical overlapping winding arrangement.In order to investigate the postfault electromagnetic performance,the reconfigured phase currents and then current density distribution in stator slots under different open-circuit conditions are discussed.According to the developed model and postfault current density distribution,the steady-state electromagnetic performance,such as the electromagnetic torque and unbalanced magnetic force,under open-circuit faulty conditions are obtained.For validation purposes,finite element analysis(FEA)is employed to validate the analytical results.The result indicate that the postfault electromagnet performance can be accurately predicted by the proposed subdomain model,which is in good agreement with FEA results.

不同相移角度绕组对双三相永磁同步电机电磁性能的影响分析

由于双三相永磁同步电机两套三相绕组之间可采用不同相移角度,以一台24槽22极双三相永磁同步电机为例,分析了相移角度对电机性能的影响规律.首先,基于各槽绕组磁动势间的相位关系,推导了在采用单层绕组和双层绕组时,两套三相绕组之间可行的空间相移角度,即0°、15°和30°,并对比分析了不同空间相移角度绕组产生的电枢磁动势频谱;然后,结合电枢磁动势谐波和电机电磁性能之间的关系,通过有限元仿真,验证了0°、15°和30°相移角度的绕组拓扑对不平衡磁拉力、反电势、平均转矩和转矩脉动等电磁性能的影响规律;最后,制作了2台单层和双层空间相移30°绕组的样机,并通过实验验证了理论和有限元仿真分析的正确性.结果表明:空间相移0°存在明显的不平衡磁拉力;空间相移30°电机平均转矩最大,转矩脉动最小.

非串级结构下的双三相永磁同步电机调速控制和电流谐波抑制研究

该文针对多源时变干扰影响的双三相永磁同步电机系统,研究其基波平面内的调速控制问题和谐波平面内的谐波电流抑制问题。首先,在基波平面采用非串级控制结构,通过构造广义比例积分观测器(generalized proportional integral observer,GPIO)估计转速环的多源快变干扰;然后,针对q轴电流的过流保护问题,在传统比例微分反馈控制器的基础上利用障碍函数设计思想,结合干扰估计信息,得到基于GPIO的电流约束复合控制器;其次,在谐波平面,通过设计2个GPIO精准估计电流环的多源快变干扰,并与比例反馈控制器结合形成复合控制器来抑制2个电流环中的谐波电流。最后,给出严谨的稳定性分析,并通过对比实验验证所提方法的有效性。

参考跟踪和扰动抑制解耦的双三相永磁同步电机容错控制策略

双三相永磁同步电机发生断相故障时,转速及电流中将会出现明显的周期性扰动。为了解决这一问题,该文提出了一种容错控制器,该控制器包含基于主控制器的参考值跟踪环路和基于重复控制器的周期性扰动抑制环路。所提出的容错控制器不仅可以实现对周期性扰动的闭环抑制,有效降低断相故障后系统中的转速脉动和谐波电流,还能够实现系统参考值追踪与周期性扰动抑制之间的解耦,避免重复控制器对暂态性能的影响。将所提出的控制器分别应用于驱动系统的转速环和电流环中,实验结果表明,与传统策略相比,该容错控制策略不仅能够有效抑制周期性扰动,还拥有更快更平稳的暂态跟踪响应。

基于多级滞环控制器的表贴式双三相永磁同步电机低电流谐波直接转矩控制策略

双三相永磁同步电机采用的传统直接转矩控制策略往往伴随着较大的转矩脉动和谐波电流。为了解决上述问题,该文提出基于多级滞环的直接转矩控制策略,该策略采用24种矢量组合的电压合成方案,可根据开关表在α-β平面输出多种电压等级。同时,提出的控制策略还可基于比例谐振控制器调制z1-z2平面电压,实现闭环谐波电流抑制。实验结果表明,在同等开关频率下,所提控制策略可以有效降低电流谐波和转矩脉动。

双三相PMSM混合储能系统分布式转矩控制方法

为克服传统电池/超级电容混合储能系统(hybrid energy storage system, HESS)中电气或机械耦合方式下存在的多级功率不平衡、机械零件不匹配等问题,本文基于双三相永磁同步电机(permanent magnet synchronous machine, PMSM)进行HESS设计,并结合电动汽车典型运行工况提出一种分布式转矩控制方法。文中首先建立双三相PMSM混合储能系统数学模型,推演分析了电机双绕组转矩关系,设计了适用于双三相PMSM的分布式转矩控制系统。在此基础上,考虑HESS中电池组和UCs特性差异,分析了高功率、低功率以及UCs能量调节三种HESS模式下的转矩关系,并完成了高低频转矩的分频协调控制。最后,基于5kW测试平台对所提方法进行测试与分析,结果表明该系统可在全速域加速、加减载、负载扰动等多模式下实现HESS稳态和暂态功率的高性能调节,同时,磁链解耦调节环节有效增强了HESS的暂态响应能力,有效地抑制了负载扰动下的系统低频振荡。

Model Predictive Torque Control for a Dual Three-phase PMSM Using Modified Dual Virtual Vector Modulation Method

Single voltage vectors applied in the conventional model predictive torque control(MPTC)for multiphase motors do not only suffer from serious torque and stator flux ripples but also cause the large harmonic current.To address the aforementioned challenges,an MPTC using a modified dual virtual vector modulation method is proposed to improve the operational performance of a dual three-phase permanent magnet synchronous motor.Virtual voltage vectors are synthesized as the candidate control set to restrain the harmonic current.A transformation method is introduced to consider both the stator flux and torque in the duty cycle modulation.The torque and stator flux ripples are simultaneously reduced by addressing the limitations of nonuniform units.Furthermore,the null voltage vector is then inserted to expand the modulation range and improve the steady-state performance.Moreover,the sawtooth carrier is adopted to address the challenge of the asymmetric switch sequence caused by the modified modulation.Finally,the experimental results are presented to verify the effectiveness and superiority of the proposed MPTC method.

五相逆变器双电机驱动系统直接转矩控制

该文针对五相逆变器双电机驱动系统提出了一种直接转矩控制方法。首先通过传统的直接转矩控制得到两台永磁同步电机的6个相开关状态,其中4个相开关状态直接施加到4个独立桥臂,然后通过权重函数确定公共桥臂的开关状态。该文还分析了电机性能的畸变情况。实验结果验证了五相逆变器双电机驱动系统直接转矩控制的可行性及有效性。

混合动力汽车用复合结构电机及其关键技术发展

为更深入地了解混合动力汽车用复合结构电机的发展趋势和关键技术,对复合结构电机及其关键技术进行综述,简要分析了有刷、无刷两类复合结构电机的组成、工作原理及其拓扑结构,并对不同复合结构电机方案的优势及其存在的关键技术问题进行深入分析和总结.结果表明:基于复合结构电机的纯电气式混合动力方案不仅可以避免基于行星齿轮的机械式混合动力方案中的振动、噪声、磨损和定期维护等问题,而且具有结构简单紧凑、易于控制的优势.无刷复合结构电机去掉了有刷复合结构电机中的电刷滑环机构,提高了系统可靠性,因此复合结构电机无刷化是该研究方向的必然发展趋势.

双重d-q空间下五相电压源逆变器空间矢量脉宽调制死区效应分析与补偿

电压源逆变器(voltage source inverter,VSI)受到死区效应以及开关暂态过程等非线性因素的影响,导致负载电机定子相电流中含有低次谐波,畸变率较大。针对五相VSI系统,在分析其双重d-q子谐波空间及电压矢量空间状态分布的基础上,进行空间矢量脉宽调制算法死区效应的研究。然后,以五相永磁同步电机矢量控制算法为例,根据仿真中设置不同的死区时间得到的电压谐波含量,验证理论分析的正确性,同时对其电流控制方案进行改进,实现双重d-q空间下的谐波电流闭环抑制,从而对VSI系统死区效应进行补偿,达到了消除电机电流中低次谐波的目的。计算机仿真和硬件在环半实物实验结果均验证了该方案的正确性和有效性。

基于双PWM的瓦楞纸板横切机控制系统设计

针对国内瓦楞纸板横切机生产线生产效率低、剪损大、电网谐波污染严重的缺点,通过分析瓦楞纸板横切机生产工艺及要求,提出了基于双PWM驱动的永磁同步电机控制系统设计方案。该文详细阐述了横切机控制系统的构成和设计原理。该控制系统具有自动化程度高,剪切精度高,高功率因数、低谐波污染的特点。

直驱风电系统双PWM变流器非线性控制策略

在直驱风电系统中,为了提高变流器的性能,该文提出了外环采用PI控制,内环采用无源控制的混合控制策略。根据主电路拓扑结构分别建立了在dq坐标系下的欧格-拉格朗日EL(Euler-Lagrange)模型和端口受控耗散哈密顿PCHD(port control Hamiltonian with dissipation)模型。基于EL模型,采用了注入阻尼的方法,得到无源控制律;而基于PCHD模型,采用能量成形的方法,利用IDA-PBC(injecting dampingpassivity-based contro)控制算法设计无源控制器。仿真结果表明机侧变流器能够实现对转速的控制;网侧变流器实现直流电压跟踪控制、单位功率因数并网。实验验证了所提控制策略的可行性。

双三相永磁同步电机的双矢量模型预测转矩控制

双三相永磁同步电机的传统直接转矩控制仅采用αβ子平面的外围电压大矢量,会导致较大谐波电流,并且直接转矩控制存在固有的磁链和转矩波动较大的问题。本文提出一种双电压矢量模型预测转矩控制策略。扩大电压矢量选择范围,根据次外围矢量与最外围矢量在z_(1)z_(2)子平面方向相反的特性增选次外围矢量,通过分配这两组矢量作用时间,使得谐波子平面的电压幅值为零,实现谐波电流抑制。降低系统计算量,根据定子磁链所在位置,将12个预测电压矢量减少至4个。进一步地采用控制预测模型估算出下一时刻的转矩值和磁链值,利用价值函数在线选出最优的一组电压矢量,使得作用的电压矢量更加准确有效。所提方法抑制了谐波电流,并达到减小转矩和磁链波动的目的,通过仿真和实验验证了该算法的可行性和有效性。

基于有限元方法的双定子永磁同步电机齿槽转矩研究

永磁电机不通电时永磁体与有槽电枢铁心之间相互作用,产生齿槽转矩,引起低速永磁电机起动困难。为了有效地削弱低速双定子稀土永磁同步电机齿槽转矩,在目前国内外永磁电机齿槽转矩研究基础上,建立了低速双定子稀土永磁同步电机齿槽转矩的解析表达式,针对表达式中影响齿槽转矩大小的一些因素,利用有限元方法进行了仿真分析,得到了影响齿槽转矩大小的变化规律,为电机最优设计提供重要依据。

低载波比工况下永磁同步电机磁链矢量轨迹分析

永磁同步电机采用空间矢量脉宽调制控制时,每个PWM周期内施加适当的电压矢量(包括电压矢量的模值、相位及作用时间)。通常情况下电机的每个基波周期内包含多个PWM周期,因此电压矢量的积分会产生一个多边形的磁链矢量运行轨迹,接近于圆形轨迹。但是,当载波比(即PWM频率与电机基波频率之比)较低时,气隙磁链矢量的多边形运行轨迹的边数很少,远远偏离于圆形,导致电流矢量的运行轨迹也偏离圆形,从而使得相电流波形畸变、电机的矢量控制性能恶化。本文将对比分析常规三相永磁同步电机和双三相永磁同步电机的数学模型、电压矢量的合成以及磁链矢量的轨迹特性,为在低载波比工况下改善电机的控制性能提供理论依据。

采用绕组变换的双三相永磁同步电动机建模研究

提出了一种双三相永磁同步电动机的数学建模新方法.基于产生相同磁动势和功率不变的原则,构建了一个等效的三相绕组,绕组变换后,原双三相永磁同步电动机等效为普通的三相永磁同步电动机.应用三相永磁同步电动机在两相同步旋转坐标系下的数学模型,完成了双三相永磁同步电动机在d-q坐标系下的数学建模和基于Matlab/Simulink的仿真建模.对一台6极双三相永磁同步电动机进行了仿真和实验,两者间最大误差在5%以内,因此该建模方法是有效和正确的.

分段供电双三相永磁同步直线电机电流解耦与扰动抑制

为减少电机输入端电压和驱动变流器容量,长定子永磁同步直线电机常采用定子分段方式供电,但是定子分段永磁同步直线电机会产生定子电感不平衡并导致电流耦合、动子过分段造成反电动势扰动和推力波动等问题。首先,推导了分段供电双三相直线电机电流控制环中电感不平衡导致的电流耦合和反电动势扰动的表达式,设计了一种反馈解耦补偿器对电流进行解耦,采用动态相对增益矩阵(DRGA)对参数失配下的解耦程度进行分析。在此基础上,设计一种二阶滑模扰动观测器,对由过分段导致的反电动势扰动与电机参数失配进行补偿,增强了电流环的抗扰特性,实现了精确的电流跟踪,有效降低了电机的推力波动。实验结果验证了电流解耦与扰动抑制有效性。