最小占空比跟踪法及其在五相逆变器双三相电机系统中的应用  

Minimum Duty-cycle Point Tracking Method and Its Applications in a New System With One Five-leg Inverter and Two Three-phase Machines

作　　者：王伟[1] 程明[1] 张邦富[1] 朱瑛[1] 丁石川[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《中国电机工程学报》2013年第3期117-124,8,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(60974060);国家重点基础研究发展计划项目(973项目)(2013CB035603);航空科学基金项目(20100769004);2011年江苏省研究生科研创新计划(CXZZ_0149)~~

摘　　要：为了减少功率开关器件的使用数量,提出了一种针对五相逆变器双三相电机系统的控制方法。首先根据传统的SVPWM方法得到每台三相电机的三相占空比;然后,从线电压角度考虑,跟踪得到满足系统控制要求的最小的五相桥臂占空比;最后,根据等分零矢量的原则得到最终的五相桥臂占空比。由于该方法跟踪最小占空比,因此可以得到各相桥臂的最小占空比。根据五相逆变器双三相电机系统的固有特性,讨论了转速互补和等速恒转矩这两种可能的运行模式。转速互补模式中,通过合理配置高低速,使得双电机系统与单电机系统对直流母线电压的需求基本相同。等速恒转矩模式作为一种容错控制策略,并通过降速的方法使系统维持最大转矩不变。实验结果均验证了所提方法的正确性和两种运行模式的可行性。To reduce the number of power switches,a new control method focused on a new system with one five-leg inverter and two three-phase machines is proposed.Firstly,three phase duty cycles for each machine is calculated using space vector pulse width modulation（SVPWM） method;then,considering line voltages,minimum duty cycles are obtained,which meet the requirement of the entire system;finally,according to the equal principle of two zero vectors,the final values of five duty cycles are determined to control two machines.Due to the tracking of minimum duty cycles,the minimum duty cycles of all legs can be obtained.Based on the performances of the new system,two possible operation modes are introduced.In the first operation mode,the velocities of two machines are complementary,which makes the dc bus voltage requirement for two-machine systems and single machine systems similar.In the second operation mode,the new system is a fault-tolerant strategy,in which the velocity is reduced and the total torque keeps unchanged.The control method and the two possible operation modes are verified by experimental results.

关 键 词：双三相电机 五相逆变器 SVPWM 占空比 

分 类 号：TM614[电气工程—电力系统及自动化]