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.

Fault-tolerant stator flux oriented decoupling control for dual three-phase permanent magnet motor without diagnosis and reconfiguration

In this paper,the fault-tolerant capability of the existing stator-flux-oriented decoupling control(SFOC)for the DTP-PM motor is investigated,and a simple fault-tolerant SFOC is further designed to enhance fault tolerance.Firstly,the mathematical model of the DTP-PM motor in the stator-flux-oriented rotating coordinate system is analyzed.An SFOC is proposed to guarantee healthy operation performance,considering torque,flux linkage,and harmonic currents.Secondly,the coupling relationship under open-phase conditions is assessed.The assessed result shows that the coupling relationship between the harmonic and fundamental components results in conflicts and poor post-fault operation.Thirdly,the proposed SFOC includes an automatic deactivation module to detect conflicts with a variable threshold.The conflicted harmonic current controllers can be excluded automatically.Hence,fault-tolerant control can be remedied without diagnosing the specific fault scenario,and excellent faulttolerant capability can be achieved.Finally,experiments on a DTP-PM motor are carried out to verify the feasibility and effectiveness of the proposed strategy.

并列式双转子混合自励磁电机励磁源参数优化设计和磁场调节特性分析

针对永磁同步电机气隙磁场不可调以及传统电励磁电机的效率低等问题,提出了一种新型并列式双转子混合自励磁电机。首先,该电机利用谐波激励原理,通过调节谐波电压可灵活调整励磁电流,在中高速域更容易实现弱磁扩速。其次,保证功率不变的前提下,先分析两部分各占的比重,再分别对励磁源参数进行优化设计。最后,通过调节励磁电流的大小与方向且利用二维有限元模型对所提电机的性能进行验证。仿真结果证明:所提电机具有较好的调磁能力,在弱磁情况下,反电动势幅值接近于0,可以有效实现转速调节。

Transient Analysis and Control Strategies for a Quad-lnverter Multiphase Multilevel Motor Drive in Faulty Conditions

In this paper, post-fault-tolerant control strategies for quad-inverter multiphase-multilevel induction motor drives are investigated. More specifically, four standard two-level three-phase VSIs （voltage source inverters） supplying the open-end windings of a dual three-phase induction motor is considered, quadrupling the power capability of a single VSI with given voltage and current ratings. In healthy conditions, the control algorithm is able to generate multi-level voltage waveforms, equivalent to the ones of a three-level inverter and to share the total motor power among the four dc sources in each switching period. This sharing capability is investigated under post-fault operating conditions, when one VSI must be completely insulated due to a severe failure on it. In this case, the conversion power unit can operate with a reduced power rating by a proper modulation of the remaining three VSIs. The whole ac motor drive has been numerically implemented, and the effectiveness of the proposed control strategies under healthy and post-fault operating conditions have been proved.

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.

Back-to-Back双三电平电励磁同步电机矢量控制系统

以基于Back-to-Back双三电平功率变换器电励磁同步电机矢量控制为研究对象,提出了适用于全速范围的全阶闭环气隙磁链观测器,阐明了其内部基于滤波器特性的电流-电压模型之间的平滑切换机理。三电平有源前端实现网侧的单位功率因数运行,减少对电网污染的同时实现能量的双向流动。同时引入具有自适应调节中点电位的简化三电平电压空间矢量脉宽调制(SVPWM)策略,并在此基础上提出新颖的三电平功率变换器相电压重构算法。现场运行结果表明基于Back-to-Back双三电平功率变换器电励磁同步电机矢量控制解决方案具有优良的控制性能,真正实现了节能调速和绿色环保的高度结合。

双定子混合励磁超环面电机结构及电感参数分析

为了研究具有特殊结构的新型双定子超环面电机的电磁特性,在对电机结构和运行原理进行分析的基础上,结合其超环面的空间结构特点,建立内定子的周向和环向磁动势模型。给出模型中自感和互感参数的解析表达式。在电磁啮合关系的基础上分析电感参数随转子转角变化的周期性规律,并讨论内定子极对数和外定子磁齿数等结构参数对电感参数的影响规律。对绕组磁链在内定子外环面上的分布规律进行仿真分析。研究结果为该种新型电机的运行特性分析和实验研究提供了理论依据。

内置永磁体双励磁直线同步电机的设计与优化

针对磁浮列车现有的全电励磁直线同步电机悬浮力有限、励磁耗能多的不足,提出内置永磁体双励磁直线同步电机结构.详细介绍了该结构的构成和特点,对永磁体励磁部分和电励磁部分分别进行解析计算,并校核次级受力强度.对该电机进行有限元分析的建模,并求解出电机内的磁场分布情况.通过基于有限元方法求解出的空载悬浮力和空载漏磁系数的比较,优化电机的4个关键结构尺寸参数.将内置永磁体双励磁结构与全电励磁结构及另一种双励磁结构进行了对比分析,结果表明,这种结构的电机具有悬浮力较大、励磁耗能少、永磁体散热好等优点.

双绕组异步发电机励磁无功影响因素的分析

定子双绕组异步发电机控制绕组励磁无功容量与电机参数、负载、转速及变比、功率输出端励磁电容等有很大关系。文章分析了额定负载和空载下控制绕组电流及无功功率随转速的变化规律，着重探求了电机漏感、励磁电感、励磁电容值的变化对控制绕组励磁电流及励磁无功功率的影响情况，所得结果有助于双绕组异步发电机的优化设计。

自励异步发电机-异步电动机串联型混合电动汽车系统

针对永磁同步电机大规模使用会消耗大量稀缺的稀土资源,同时也会造成一定的环保问题,采用异步电机作为串联型混合电动汽车(HEV)的动力系统。针对发电机工作模式,设计了一种由自励异步发电机(SEIG)和异步电动机(IM)及双PWM变流器组成的串联型HEV系统,SEIG侧的变流器采用基于SEIG端电压定向的矢量控制方法,IM侧的变流器采用基于IM转子磁链定向的矢量控制方法。试验结果表明,采用异步电机的串联型HEV,加减速时具有良好的动静态性能,工作状态稳定,验证了该方案的有效性。

双激励下轮毂电机悬置构型对电动车平顺性的影响

为解决轮毂电机引入电动汽车使车辆垂向负效应加剧的问题,研究路面激励和电机垂向激励耦合下轮毂电机悬置构型对车辆垂向性能的影响.综合分析国内外电动汽车构型影响规律,比较两种分别以电机定子和电机整体悬置作为动态吸振器车辆构型的平顺性,搭建双重激励计算模型选择优选方案,以车辆平顺性指标均方根值最小为优化目标,应用NSGA-Ⅱ算法对优选方案中动态吸振器的橡胶衬套刚度和阻尼进行优化设计,得到满足要求的构型和匹配参数,并对优化后的车辆构型进行仿真验证.研究结果表明:两种悬置方案都缓和了由于轮毂电机引入带来的负面效应,而对择优选出的电机整体悬置方案优化后可使车身加速度降低38.53%,轮胎动载荷下降7.94%.仿真结果证明,针对路面和电机双重激励提出的优化构型及参数,改善了轮毂电机驱动电动汽车的垂向负效应,提高了车辆平顺性和安全性.

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.

双三相电励磁同步电机矢量控制系统研究

研究了一种气隙磁场定向的双三相电励磁同步电机矢量控制系统,分析了双三相电机数学模型及相应坐标变换,引出了混合模型气隙磁链观测器,给出了该控制系统控制方案。该控制系统可通过双三相电机矢量控制实现高精度、大扭矩输出,电机转速与电流均保持着较好的输出特性,气隙磁链观测精度高。通过仿真结果可以看出,该控制系统有着良好的运行性能,仿真结果与理论分析一致,验证了控制方案的正确性与可行性。

TMEIC高压变频器在高炉鼓风机同步电动机软启动中的应用

介绍TMEIC电压源型高压变频器在河北纵横集团丰南钢铁有限公司炼铁工程新建4座高炉配套鼓风机10kV交流无刷励磁同步电动机软启动应用及效果;软启动系统采用二拖六配置方式,TMEIC变频器软启动为静止软启动方式,通过内部同期及外部同期双同期方式安全准确完成高炉电动机软启动同步投切,软启动投切过程为无扰切换。