【作者】 刘靖；

【导师】 李益华；

【作者基本信息】 长沙理工大学 ， 控制理论与控制工程， 2017， 硕士

【摘要】 论文以全电飞机为研究背景,针对全电飞机安全可靠的实际需求,通过比较现今主要使用的容错方案,选取了容错性能相对较好的五相永磁同步电动机作为全电飞机的驱动电机。使用独立H桥式电路作为整个控制系统的驱动电路,整个系统中各相空间电压矢量独立,用矢量转换为幅值的描述,为电动机控制系统的分析与计算做铺垫。根据直接转矩控制(Direct Torque Control,DTC)算法具有的容错性,选用为五相永磁同步电动机控制系统。沿袭三相永磁同步电动机直接转矩控制系统的扇区划分、磁链跑圆的思想,将合成的总空间电压矢量划分为十扇区,根据空间电压矢量与定子磁链幅值随定子磁链角度的变化规律,生成各扇区总空间电压矢量选取表。传统三相永磁同步电动机直接转矩控制系统的磁链观测器拥有纯积分器,有直流偏移问题,造成定子磁链的不准确,对此构建了新的磁链观测器。根据总空间电压矢量选取表,完成五相永磁同步电动机总空间电压矢量调制直接转矩控制(Total-Space-Vector Pulse Width Modulation Direct Torque Control,T-SVPWM-DTC)系统的构建。通过对五相永磁同步电动机T-SVPWM-DTC系统在正常态和故障态(一相断路或者短路)情况下进行仿真,系统在正常态下运转良好,出现故障时不对总空间电压矢量表切换,能够实现五相永磁同步电动机控制系统容错运行,但是绕组相电流有畸变,转矩脉动较大。在T-SVPWM-DTC系统相电流出现畸变的情况下,应用相空间电压矢量调制的直接转矩控制(Phase-Space-Vector Pulse Width Modulation Direct Torque Control,P-SVPWM-DTC)算法,该控制算法通过计算目标磁链矢量以及作用电压的控制时间,来纠正定子磁链的运动轨迹与磁链跑圆。但是P-SVPWM直接转矩控制系统出现故障(一相断路或短路)时,系统会出现失衡,为了使控制系统保持平衡,提出了缺失磁链进行补偿的容错算法。对五相永磁同步电动机P-SVPWM-DTC系统进行常态到一相绕组故障(断路或短路)仿真,仿真表明P-SVPWM-DTC系统能够消除各绕组相电流的畸形,且相对T-SVPWM-DTC系统转矩脉动减少。P-SVPWM直接转矩控制系统在一相故障(断路或短路)时,通过容错方案对缺失磁链进行补偿,故障不影响控制系统的运转情况,显示五相永磁同步电动机P-SVPWM直接转矩控制系统具有较高的可行性。更多还原

【Abstract】 In this thesis,all electric aircraft as the research background,the actual demand for all electric aircraft is safe and reliable,the fault-tolerant scheme comparison today the main use,select the fault tolerance of the relatively good performance of the five phase permanent magnet synchronous motor as driving motor electric aircraft.Independent H bridge circuit is used as the driving circuit of the control system,the phase space voltage vector independent in the whole system,use the vector into the amplitude of the description,analysis of motor control system and pave the way for the calculation.According to the fault tolerance of direct torque control(Direct Control Torque)algorithm,five phase permanent magnet synchronous motor(DTC)control system is selected.Follow the sector division,three-phase permanent magnet synchronous motor direct torque control system running round flux,the total space voltage vector divided into the synthesis of the ten sector,according to the variation of space voltage vector and stator flux amplitude with stator flux angle,the total generation sector of space voltage vector selection table.The flux observer of the direct torque control system of the traditional three-phase permanent magnet synchronous motor(PMSM)has a pure integrator,which has a DC offset problem,which leads to the inaccurate stator flux linkage.According to the total space voltage vector selection table,complete control of five phase permanent magnet synchronous motor direct torque total space vector modulation(Total-Space-Vector Pulse Width Modulation Direct Torque Control,T-SVPWM-DTC)system.According to the five phase permanent magnet synchronous motor T-SVPWM-DTC system in normal and fault states(one phase open circuit or short circuit)simulation case,the system worked well in the normal state,when a fault occurs without the total space voltage vector switching table,can achieve the five phase permanent magnet synchronous motor control system fault tolerant operation,but the phase winding current distortion and torque pulsation.In the current T-SVPWM-DTC system distortion,voltage vector modulation direct torque control based on phase space(Phase-Space-Vector Pulse Width Modulation Direct Torque Control P-SVPWM-DTC)algorithm,the control algorithm by calculating the flux vector and voltage control time to correct the trajectory and flux of stator flux ran round.However,when the P-SVPWM direct torque control(DTC)system is faulty(one phase open circuit or short circuit),the system will be out of balance.In order to keep the balance of the control system,a fault tolerant algorithm is proposed.The five phase permanent magnet synchronous motor P-SVPWM-DTC system normal to a phase winding fault(open circuit or short circuit)simulation,the simulation results show that P-SVPWM-DTC system can eliminate the phase winding current anomalies,and relatively T-SVPWM-DTC system torque ripple reduction.P-SVPWM direct torque control system in a phase fault(open circuit or short circuit),to compensate for the lack of flux through fault tolerant scheme,failure does not affect the operation of the control system,shows the feasibility of five phase permanent magnet synchronous motor P-SVPWM direct torque control system has high.更多还原