【作者】 那日沙；

【导师】 王旭东；

【作者基本信息】 哈尔滨理工大学 ， 电力电子与电力传动， 2013， 博士

【摘要】 由于能源与环境问题带来的影响，传统汽车正在向“电动”转变，世界各国和各大汽车厂商无不投入巨资进行电动汽车的研究。作为电动汽车核心驱动部件的电机系统，是这一方向的研究热点。其中永磁同步电动机以其体积小、重量轻、效率高、功率密度大、调速范围宽、维护简单等优点，逐渐成为电动汽车电机驱动系统的主流。由于永磁同步电机转子使用永磁体，其激磁磁场不可调节，对其在有恒功率、宽调速范围运行要求的车载电机驱动应用上提出了挑战，引起了国内外学者的高度重视。因此，为了提高混合动力电动汽车高速运行时转矩输出的稳定性及响应转矩突变的动态响应特性，本文围绕永磁同步电机的弱磁控制系统展开深入的研究工作。完善的弱磁控制系统包含内环电流追踪控制和外环电流指令调节控制两部分组成。永磁同步电机是多变量、非线性、强耦合的系统，对参数和干扰极为敏感，因此传统的线性控制方法无法准确描述内环电流追踪调节过程，难以保证电机在高转速运行范围内输出转矩的稳定性。针对这一问题，本文深入分析反馈线性化理论，研究通过对输出变量进行Lie微分运算，得到所需坐标变换及非线性系统状态反馈量，进而实现永磁同步电机的输入输出线性化控制的方法，设计出基于输入输出反馈线性化算法的内环电流调节控制器。该电流控制器具有动态响应速度快、稳态追踪误差小、实现简单等优点，然而这种控制方法的效果要受到电机参数的影响。为了提高其对电机参数变化的鲁棒性，本文分析比较了若干典型的电机参数在线、离线计算方法，提出了基于电机磁链信息的输入输出反馈线性化电流控制算法。该方法重新设定系统输入量信息、反馈变量信息及系统控制方程，选取电机磁链作为电流调节器的输入控制信息，通过电压、电流基波分量离线计算电机磁链参数，不但有效地降低了参数估算的复杂程度，而且充分考虑了永磁同步电机谐波分量对参数计算的影响。改进后的内环电流控制器的鲁棒性得到了明显的提升。永磁同步电机外环电流指令调节控制方式多采用闭环反馈式调节或前馈开环式调节。传统的前馈开环式调节方法获取当前电机的转速、电压、转矩的实时信息，利用数学公式计算出dq轴电流的最佳期望值，该类算法的特点在于实时性好，系统动态响应性能较好，但由于采用开环控制，系统的抗扰动特性较差；传统的闭环调节方法将输出的控制指令电压幅值与逆变器设定的电压门限值作为PI调节器的输入，而PI调节器的输出作为d轴电流指令的补偿量对其进行修正，该类算法的特点是反馈调节环节不依赖于电机参数，系统的鲁棒性有所提高，但不足之处在于当电机高速运行时一旦转矩指令发生突变，单纯的PI调节难以保证系统的快速动态响应特性，严重时会影响到系统的稳定性。针对上述分析，本文提出一种含有电压指令补偿环节的混合式弱磁电流指令调节控制方法，该方法的前馈通道包含一个电机磁链与转矩/电流的二维表格，根据当前转矩和磁链信息快速查取dq轴电流期望值，保证了系统的实时性及动态特性要求；其反馈通道利用电压输出指令与电压指令补偿环节的偏差进行PI调节，得到当前电机的磁链信息，保证了系统的抗扰动特性以及高速弱磁运行时的稳定性要求。本文针对永磁同步电机弱磁控制系统进行了仿真和实验研究。仿真和实验结果表明所设计的弱磁控制系统对负载扰动鲁棒性强，具有良好的稳态特性和动态跟踪性能。所设计方法及其控制器结构简单，工程实用性强，因而适用于混合动力电动汽车电机驱动系统。更多还原

【Abstract】 Due to the energy and environment issues, the conventional automobileindustry is changing to “electric”. Most countries and automobile companieshave invested a lot of money to do the research on electric vehicles. ThePermanent Magnet Synchronous Machine has gradually become the mainstreamof the electric vehicles drive system due to its small size, light weight, highefficiency, high power density, widely range of velocity modulation and theadvantages of simple maintenance. As a result of using permanent magnets in therotor of the Permanent Magnet Synchronous Machine, the excitation magneticfield can’t be adjusted, which is a challenge in the application of vehicle motordrive with the requirements of persistent power and wide range of velocitymodulation, which has drawn a great attention of scholars at home and abroad.Therefore, in order to improve the stability of the torque output in high speedoperation and the dynamic response characteristics when the torque response hasa mutation of the Hybrid Electric Vehicles (HEV), further research work has beendone regarding the Flux Weakening control system of the Permanent MagnetSynchronous Machine in this dissertation.Perfect flux weakening control system consists of the inner loop of currenttracing control and the outer loop of flux weakening current commandadjustment. Permanent magnet synchronous machine is a multivariate, nonlinear,and strong coupling system, which is very sensitive to parameters andinterference, so the traditional linear control method can not accurately describethe adjustment process of current tracking in the inner loop and has a difficulty inensuring the stability of the output torque within the range of high speed operating. This paper has a depth analysis of the Feedback Linearization theory,and conduct a research through applying Lie Derivative to the output variables toget the desired coordinate transformation and the state feedback variables ofnonlinear system, so the Input-Output Linearization control method of thePermanent Magnet Synchronous Machine can be realized and the inner loopcontroller to adjust current based on the Input-Output Feedback Linearizationalgorithm is designed in this thesis. The current controller has the advantages offast dynamic response, small error of steady state tracking, simpleimplementation etc. This control method, however, has inevitable problems withdepending on motor parameters. In order to improve its robustness of motorparameters change, this article analyzes and compares a number of on-line andoff-line calculation methods of typical motor parameters and proposes the inputand output feedback linearization of current control algorithm based on motorvoltage, flux estimation of current fundamental information. This methodreconfigures the system input, feedback variable information and the systemcontrol equations and selects motor Flux linkage as the input control informationof the current regulator. Through the offline calculation of the parameters of themotor flux according to the voltage and current fundamental component, not onlyeffectively reduce the complexity of the parameter estimation, and fully considerthe influence of the permanent magnet synchronous motor harmonic componentof the calculated parameters. The inner loop current controller improved hasimproved the characteristics of anti-disturbance of parameters significantly.The regulation and control mode of outer loop flux weakening currentcommand of the Permanent magnet synchronous machine adopt the Feedback(Closed-loop) regulating or Feedforward (Open-loop) adjustment in most cases.The traditional adjustment method of feedforward open-loop uses the real-timeinformation on the speed, voltage and torque of the current motor, and uses themathematical formula to calculate the best expectations of the dq-axis current,this type of algorithm is characterized by good real-time controlling and dynamicresponse of the system, but the system characteristic of anti-disturbance is poordue to the using of open-loop control. The traditional regulation of closed-loopoften uses the deviation of output voltage command and the allowable limit valueof inverter to adjust the PI regulator and the output of the regulator as the compensation given by the dq-axis current is amended. This characteristic of thealgorithm is that the feedback regulation of the link does not depend on motorparameters, and the robustness of the system is increased, but the drawback isthat the capacity of dynamic response of the system declined. In view of theabove analysis, a control method on feedforward/feedback hybrid flux weakeningcurrent command that contains the compensation link of the flux weakeningvoltage command is proposed in this paper. This method contains a two-dimensional form of the motor flux and torque/current in its feedforward channel,which can check the dq-axis current expectations based on the current demandfor torque and flux quickly, so as to ensure the system requirements of real-timeand dynamic characteristics. The feedback channel uses PI regulator for voltageoutput command and voltage command compensation link to get the current fluxinformation of the current motor, which ensures that the anti-disturbancecharacteristics of the system and stability requirements of high-speed fluxweakening operation.In this dissertation, simulation and experimental studies on PMSM fluxweakening control system have been carried out. Simulation and experimentalresults show that the system has strong robustness against load disturbances, andobtains good steady characteristics and dynamic tracking performances. Thedesigned methods and controllers are simple in structure and practical inengineering, so they are applicable for motor drive system for HEV.更多还原