学术
异步电机直接转矩控制模糊DSVM控制策略
奚国华[1,2] 胡卫华[1] 喻寿益[1] 桂卫华[1]
[1]中南大学信息科学与工程学院,湖南长沙410083 [2]中国北方机车车辆工业集团公司,北京100035
摘 要:
针对传统异步电机直接转矩控制系统低速转矩脉动大、电流畸变严重、磁链轨迹内陷以及开关频率不固定等问题,基于离散空间电压矢量调制（DSVM）技术和模糊控制技术,提出了一种改善低速性能的控制策略。利用DSVM技术合成19种电压矢量,使低速区可供选择的电压矢量数目增加,提高了转矩调节器的控制精确度,采用模糊控制器选择电压工作矢量,明显抑制了转矩脉动。仿真结果表明,改进的DSVM控制策略及模糊控制算法的应用,在保证开关频率恒定的前提下,明显克服了低速磁链轨迹内陷、转矩脉动大、电流畸变严重等缺点,有效地改善了直接转矩控制的低速运行性能。[著者文摘]
文章出处:
《电机与控制学报》-2007年11卷5期,449 -435-439,449页
分 类 号:
文献标识码:
A
文章编号:
1007-449X（2007）05-0435-05
Fuzzy DSVM strategy in the direct torque control of an induction motor
XI Guo-hua, HU Wei-hua, YU Shou-yi, GUI Wei-hua （1. College of Information Science and Engineering, Central South University,Changsha 410083, China; 2. China Northern Locomotive ＆ Rolling Stock Industry （Group） Corporation, Beijing 100035, China）
Abstract:
Some problems such as large torque ripples, current distortion, flux depression and unstable switching frequency exist in the Conventional direct torque control of induction motor in low speed range. Based on the technology of discrete space vector modulation （DSVM） and fuzzy control, thispaper proposes a control strategy to improve the performance of low-speed, DSVM synthesis technology is used to produce 19 types of vector voltage, which makes the number of low-speed zones vector voltage increase and gains accuracy of torque control regulator, and the fuzzy logic controller is used to select the voltage vector to inhibit torque ripple. Simulation results prove that the large torque ripple, current distortion, flux depression have been overcome remarkably under the condition of maintaining the switching frequency constant by the application of the improved DSVM-DTC and the fuzzy DSVM-DTC strategy. The low speed performance of direct torque control has been improved effectively.[著者文摘]
Key words:
direct torque control; fuzzy control; discrete space vector modulation; low speed performance
基金资助:
国家自然科学基金项目（60574030）
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