基于电流软斩波的开关磁阻电机分段PWM变占空比控制  

Subsection PWM Variable Duty Cycle Control of Switched Reluctance Motor Based on Current Soft Chopping

作　　者：马铭遥 袁克湘 杨晴晴 杨淑英[1] 张兴[1] MA Mingyao;YUAN Kexiang;YANG Qingqing;YANG Shuying;ZHANG Xing(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui Province,China)

机构地区：[1]合肥工业大学电气与自动化工程学院

出　　处：《中国电机工程学报》2018年第18期5582-5589,共8页Proceedings of the CSEE

摘　　要：开关磁阻电机在启动和低速运行时常采用电流斩波控制,但是实际应用中会出现电流超出滞环区间的现象,由此带来较大的电流脉动和转矩脉动。该文对这种现象进行分析,并结合脉宽调制技术和分段控制,提出一种优化的基于电流软斩波的开关磁阻电机分段脉宽调制（pulsewidth modulation,PWM）变占空比控制方法。该方法通过改变PWM占空比调节绕组两端励磁和退磁电压,并依据电感线性模型进行区间分段,不同导通区间采用不同的占空比。通过仿真得到不同速度、参考电流下的最优占空比,拟合出占空比–转速–电流函数关系式。最后通过仿真和实验对该文的控制方法进行验证,证明优化后的控制方法能够克服传统软斩波控制的缺陷,达到较好的电流跟踪效果,具有较高的实际应用价值。Current chopping control is a traditional control method for the switched reluctance motor （SRM） drive system, especially in its starting and low. speed operation area. However in practical applications, currents usually exceed the hysteresis interval, which results in larger current ripples and torque ripples. Combined with pulse width modulation and piecewise control, an optimized subsection PWM variable duty cycle control of SRM based on current soft chopping is proposed. In this method, the excitation voltages and demagnetization voltages of the windings are regulated by the duty cycle of PWMs, and different control intervals are divided according to the inductance linear model for achieving excellent control performance, where different duty cycles are applied for these different conduction intervals respectively. The optimal duty cycles under different speeds and reference currents are obtained by the simulation results, and the duty cycle-speed-current function formula is fitted. In the end, the proposed control method is verified by simulation and experimental results, which proves that the optimized control method can overcome the limitation of traditional soft chopping control, achieve good current tracking performance and have high practical application value.

关 键 词：电流斩波控制 电流脉动 转矩脉动 脉宽调制技术 分段控制 

分 类 号：TM352[电气工程—电机]