摘要
死区效应的存在使得电压型逆变器输出电压和电流不能跟踪参考电压和电流,相位发生变化,谐波分量增加,输出转矩脉动增大,尤其在电机低速运行时,可能导致系统的不稳定。深入分析了死区效应和零电流嵌位对输出电流的影响。针对电流过零区域极性判断不准从而导致误补偿的问题,提出在电流过零区域设置夹断区间,在夹断区间外采用固定值补偿占空比,在夹断区间内采用线性补偿占空比。通过TMS320F2812数字信号处理器(DSP)芯片实现补偿算法,在750W永磁同步电机上得到验证。仿真和试验结果表明,采用该方法可有效减小电流畸变、谐波分量及零电流驻留时间。
The existence of inverter dead time made the output voltage and current of inverter be different from its reference voltage and current, made the output torque of servo motor ripple largely. Especially in the condition of low speed, dead time may cause servo system unstable. The influence of dead time and zero-current clamping of in- verter was analyzed in detail. In the zero-crossing current region it was difficult to determine the current polarity and thus the compensation may be incorrect. Combine the fixed compensation with corrected compensation, and taking lin- ear compensation method at the interval of zero-current clamping region. The compensation algorithm was implemented based on TMS320F2812 DSP,and verified in the 750 W PMSM. Simulation and experiment results showed that, the current distortion, harmonic components and the time of zero current were reduced effectively.
出处
《电机与控制应用》
北大核心
2010年第10期1-5,共5页
Electric machines & control application
基金
广西制造系统与先进制造技术重点实验室资助项目(桂科能07109008_020_K)
南宁市科技攻关项目(200802026A)
广西科技攻关项目(桂科攻10100001-2)
关键词
电压型逆变器
永磁同步电机
死区效应
零电流嵌位
voltage-source inverter
permanent magnet synchronous motor （PMSM）
dead-time effects
zero-current clamping
