谐波分量对异步电机性能的影响及抑制方法  

Effect of Harmonic Components on Performance of Asynchronous Motor and Its Suppression Method

作　　者：龚育林 GONG Yulin(School of Mechanical and Electrical Engineering,Xinyu University,Xinyu 338004,China)

机构地区：[1]新余学院机电工程学院,江西新余338004

出　　处：《电机与控制应用》2020年第7期17-21,52,共6页Electric machines & control application

摘　　要：晶闸管逆变器作为异步电动机的供电电源时,输出的电压和电流中含有丰富的谐波,对异步电机的运行性能会产生显著影响,主要表现在功率损耗增加、效率和功率因数下降等,传统脉宽调制(PWM)方法虽然可以消除低次谐波的影响,但整体效果不理想。通过谐波对定子及其他电机参数影响的具体分析,提出了以电机总损耗最小为目标函数,并根据各种损耗系数随频率变化情况与逆变器晶闸管开关元件切换次数的关系,确定载波比,对传统PWM进行优化策略设计方案。试验结果表明,优化后的方案可有效抑制谐波影响。When the thyristor inverter is used as the power supply for asynchronous motors,the output voltage and current are rich in harmonics.These harmonics will have a significant impact on the operating performance of asynchronous motors,resulting in the increase of power loss and the decrease of efficiency and power factor.Although the traditional pulse width modulation(PWM)method can eliminate the influence of low-order harmonics,the overall effect is not ideal.Through the specific analysis of the influence of harmonic components on the stator and other motor parameters,the minimum total loss of asynchronous motor is taken as the objective function.Then,carrier ratio is determined according to the relationship between the variation of various loss coefficients with frequency and the number of switching times of the inverter thyristor switching element.Finally,the strategy design of general PWM is optimized.The test results show that the optimized design can effectively suppress the influence of harmonics.

关 键 词：异步电机 谐波分量 脉宽调制 电机参数 

分 类 号：TM343[电气工程—电机]