CAJ | 학술논문

变频驱动感应电机系统在低转速、轻载下容易出现低频振荡现象。以变频驱动的三相电机系统为例,由电机小扰动模型及逆变系统开关模型入手,推导出全系统小扰动数学模型。利用现代控制理论赫尔维兹判据分析了系统的稳定性并绘制出三维不稳定区域,详细分析了不同运行工况下电机参数、直流滤波电感电容、变频器死区时间、调制频率、调制比等参数变化时对系统稳定性的影响规律并得到了仿真及实验验证。此推导与分析过程可以推广至变频驱动的多相感应电机系统中,结论有助于此类系统参数合理设计与稳定运行。
변빈구동감응전궤계통재저전속、경재하용역출현저빈진탕현상。이변빈구동적삼상전궤계통위례,유전궤소우동모형급역변계통개관모형입수,추도출전계통소우동수학모형。이용현대공제이론혁이유자판거분석료계통적은정성병회제출삼유불은정구역,상세분석료불동운행공황하전궤삼수、직류려파전감전용、변빈기사구시간、조제빈솔、조제비등삼수변화시대계통은정성적영향규률병득도료방진급실험험증。차추도여분석과정가이추엄지변빈구동적다상감응전궤계통중,결론유조우차류계통삼수합리설계여은정운행。
The inverter-fed induction motor drive system may become unstable at low frequencies and light load. Taking the inverter-fed three-phase induction motor drive system as an example,the small disturbance mathematic model of whole system is deduced. Based on small disturbance model of induction motor and switching model of inverter system,the three-dimensional unstable region is presented and discussed by Hurwitz stability criterion of modern control theory. The results of mathematic analysis,simulation and experiments are identical. The effect of different motor parameters,filter-inverter parameters,and operation conditions on system stability is studied in details. The analysis method can be applied to inverter-fed multiphase induction motor drive system,and the conclusion obtained in the paper may contribute to the design of parameters and stable operation of the system.