CAJ | 학술논문

永磁同步电动机系统广泛采用矢量控制策略实现转矩控制,电流控制环是其核心部分.电流环一般采用PI型控制,但PI型电流控制动态响应动态特性受到制约,参数整定必须在超调量及响应时间等指标之间折衷选择.为了改进PI型电流控制的动态响应性能,在输入误差较大时,采用滑模变结构控制,输入误差较小时,切换到PI型电流控制.结合滑模变结构和PI型电流控制,可以充分利用滑模变结构控制动态响应快,以及PI型电流控制无稳态误差的特点,并能解决滑模变结构控制的抖颤问题.实验结果表明该电流控制方法响应时间短而且超调量小,同时获得良好的动态响应和控制精度.
영자동보전동궤계통엄범채용시량공제책략실현전구공제,전류공제배시기핵심부분.전류배일반채용PI형공제,단PI형전류공제동태향응동태특성수도제약,삼수정정필수재초조량급향응시간등지표지간절충선택.위료개진PI형전류공제적동태향응성능,재수입오차교대시,채용활모변결구공제,수입오차교소시,절환도PI형전류공제.결합활모변결구화PI형전류공제,가이충분이용활모변결구공제동태향응쾌,이급PI형전류공제무은태오차적특점,병능해결활모변결구공제적두전문제.실험결과표명해전류공제방법향응시간단이차초조량소,동시획득량호적동태향응화공제정도.
Vector control methods are widely used in PMSM systems to fulfil torque control. The current loop is the key part of vector control. The PI controllers are most widely used by the current loop. The disadvantage of PI current controller is the limited dynamic response. When controller tuning is carried out,the performance criteria can not be fully satisfied at the same time. Thus it must make a compromise between overshot and settling time. To improve the dynamic response of current control,a method which combines PI control scheme and sliding mode control scheme is proposed. When input error is large,the sliding mode control is used. When input error becomes small,it is switched to PI control. The proposed method can take advantage of both merit of sliding mode control and PI control. The proposed method can also eliminate chattering existed in sliding mode control scheme. Experimental results show that the method can obtain short settling time and small overshot.