【作者】 张悦；

【导师】 高强；

【作者基本信息】 哈尔滨工业大学 ， 能源动力（专业学位）， 2025， 硕士

【摘要】 随着电机驱动系统应用场景的日益多样化,长距离电机驱动成为工业自动化、电动交通、舰船电推进等领域所面临的技术需求。电压源型逆变器(Voltage Source Inverter,VSI)在长线驱动系统中存在行波反射与共模干扰的问题,而电流源型逆变器(Current Source Inverter,CSI)具备电流源的特性以及较低的输出dv/dt,成为了这一应用场景下更具优势的拓扑结构。双三相永磁同步电机(Dual Three-phase Permanent Magnet Synchronous Motor,DT-PMSM)凭借其高效率、高功率密度的特点与容错能力,成为高可靠性电驱系统的理想选择,可以为高性能驱动提供可行的解决方案。本文围绕长线驱动系统对高可靠性、高电磁兼容性以及高功率密度的应用需求,以SiC器件的并联CSI作为研究对象,开展均流控制方法与双三相PMSM控制策略的相关研究。首先,基于对偶原理给出CSI的拓扑结构设计方法,完成CSI系统的数学建模以及关键电容元件的参数设计方案。然后对双三相PMSM进行建模分析,并深入分析了双dq变换与空间矢量解耦变换之间存在的差异,为后续控制策略的设计打下基础。其次,为解决并联CSI中的电流不平衡问题,分析了引起模块间电流不平衡的主要原因,包括器件的开关状态差异、模块的阻抗不平衡等因素,并在此分析结论上设计了两种均流方法。提出了基于中矢量以及虚拟阻抗的均流策略,以应对不同类型的负载。通过仿真验证了上述策略的有效性,分析了两种控制方法在实际应用中的适用性。再次,分析了CSI电容电压环对系统稳定性的影响,并给出电容电压环的参数设计方法。以此为基础提出了一种基于空间矢量解耦的双三相永磁同步电机闭环控制策略,实现了对电磁转矩的解耦控制。为减小谐波电流,设计了基于相邻四矢量的空间矢量脉宽调制策略,仿真验证了提出的控制方法的有效性。最后,搭建了基于SiC MOSFET的并联CSI驱动控制实验平台,完成了平台的硬件电路搭建与软件程序设计。依托此实验平台,对所研究的均流控制策略与空间矢量解耦闭环控制算法进行了实验验证。更多还原

【Abstract】 With the increasingly complex application scenarios of motor drive system,long-distance transmission has become an unavoidable technical challenge in the fields of industrial automation,electric transportation,ship electric propulsion and so on.Voltage source inverter(VSI)has the problems of traveling wave reflection and common mode interference in long line transmission,and current source inverter(CSI)has the characteristics of current source and low output dv/dt,which has become a more advantageous topology in this application scenario.With its low-voltage high-power output characteristics and fault tolerance,dual three-phase permanent magnet synchronous motor(DT-PMSM)has become an ideal choice for high reliability electric drive system,which can provide a feasible solution for high-performance drive under the condition of long line transmission.Therefore,this paper focuses on the application requirements of high reliability,high electromagnetic compatibility and high power density for the long-distance transmission drive system,and takes the parallel CSI platform based on SiC devices as the research object to study the current balance control strategy and the control strategy of dual three-phase PMSM.Firstly,this study conducts a theoretical analysis of the CSI’s topological structure based on the duality theorem,establishes the mathematical model of the CSI system,and derives the parameter design scheme for key capacitance components.Next,the dual three-phase PMSM is modeled and analyzed,with an in-depth comparison of the two rotation coordinate transformations,which provides a foundation for the development of subsequent control strategies.Secondly,current imbalance represents one of the key technical challenges in parallel CSI systems.This study identifies the primary causes of inter-module current imbalance,including inconsistent device operating status,asymmetric load-side impedance,and other contributing factors,and proposes two current balance strategies,which respectly based on mid vector and virtual impedance,to deal with different types of load.Simulation results verify the effectiveness of these strategies,and the applicability of the two control methods in practical application is further analyzed and compared.Thirdly,this study investigates the operational mechanism of the CSI capacitor voltage loop and its impact on system stability,while providing a systematic design methodology for the loop parameters.Building on this foundation,the study proposes a closed-loop control strategy for dual three-phase PMSM based on space vector decoupling,achieving effective electromagnetic torque decoupling control.Furthermore,to suppress harmonic subspace currents,developing an adjacent-four-vector space vector pulse width modulation(SVPWM)strategy,which significantly enhances output current waveform quality.Comprehensive simulation studies validate the effectiveness of the proposed control framework,demonstrating its practical viability.Finally,this study establishes an experimental SiC-MOSFET-based parallel CSI drive and control platform,systematically implementing the hardware circuit design,software programming,and platform integration with comprehensive debugging procedures.Utilizing this experimental setup,the study conducts rigorous verification of both the current balance control strategy and the space-vector-decoupling closed-loop control algorithm,and demonstrate their operational effectiveness under practical conditions.更多还原