高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
3期
704-711
,共8页
程启明%王映斐%薛阳%胡晓青
程啟明%王映斐%薛暘%鬍曉青
정계명%왕영비%설양%호효청
异步电机%直接转矩控制%模糊控制器%定子电阻辨识%无速度传感器%模型参考自适应%转矩脉动
異步電機%直接轉矩控製%模糊控製器%定子電阻辨識%無速度傳感器%模型參攷自適應%轉矩脈動
이보전궤%직접전구공제%모호공제기%정자전조변식%무속도전감기%모형삼고자괄응%전구맥동
induction motor%direct torque control%fuzzy controller%stator resistance identification%speed sensorless%model reference adaptive system%torque ripple
为解决异步电动机直接转矩控制（direct torque control,DTC）中低速运行时定子电阻变化对系统性能影响较大的问题,提出了一种基于定子电阻辨识和无速度传感器的异步电机直接转矩控制模糊系统。其中定子电阻采用模糊神经网络进行辨识;电机转速采用基于转子磁链的模型参考自适应系统（model reference adaptive sys-tem,MRAS）法进行估计;同时采用三输入单输出的模糊控制器调节脉冲宽度调制（pulse width modulation,PWM）信号占空比的异步电动机直接转矩控制的策略,三输入变量为转矩误差、磁链幅值误差和磁通角。此策略即在传统异步电动机直接转矩控制的基础上,用模糊控制器代替传统DTC中的滞环比较器和空间电压矢量状态选择器来细分控制规则,最后控制逆变器的开关,以减小低速时转矩和磁链脉动,提高系统转矩响应速度。仿真结果表明该系统可减小转矩和磁链脉动,提高系统的鲁棒性和自适应性,改善系统的动、静态品质。
為解決異步電動機直接轉矩控製（direct torque control,DTC）中低速運行時定子電阻變化對繫統性能影響較大的問題,提齣瞭一種基于定子電阻辨識和無速度傳感器的異步電機直接轉矩控製模糊繫統。其中定子電阻採用模糊神經網絡進行辨識;電機轉速採用基于轉子磁鏈的模型參攷自適應繫統（model reference adaptive sys-tem,MRAS）法進行估計;同時採用三輸入單輸齣的模糊控製器調節脈遲寬度調製（pulse width modulation,PWM）信號佔空比的異步電動機直接轉矩控製的策略,三輸入變量為轉矩誤差、磁鏈幅值誤差和磁通角。此策略即在傳統異步電動機直接轉矩控製的基礎上,用模糊控製器代替傳統DTC中的滯環比較器和空間電壓矢量狀態選擇器來細分控製規則,最後控製逆變器的開關,以減小低速時轉矩和磁鏈脈動,提高繫統轉矩響應速度。倣真結果錶明該繫統可減小轉矩和磁鏈脈動,提高繫統的魯棒性和自適應性,改善繫統的動、靜態品質。
위해결이보전동궤직접전구공제（direct torque control,DTC）중저속운행시정자전조변화대계통성능영향교대적문제,제출료일충기우정자전조변식화무속도전감기적이보전궤직접전구공제모호계통。기중정자전조채용모호신경망락진행변식;전궤전속채용기우전자자련적모형삼고자괄응계통（model reference adaptive sys-tem,MRAS）법진행고계;동시채용삼수입단수출적모호공제기조절맥충관도조제（pulse width modulation,PWM）신호점공비적이보전동궤직접전구공제적책략,삼수입변량위전구오차、자련폭치오차화자통각。차책략즉재전통이보전동궤직접전구공제적기출상,용모호공제기대체전통DTC중적체배비교기화공간전압시량상태선택기래세분공제규칙,최후공제역변기적개관,이감소저속시전구화자련맥동,제고계통전구향응속도。방진결과표명해계통가감소전구화자련맥동,제고계통적로봉성화자괄응성,개선계통적동、정태품질。
To reduce the effect of stator resistance changing with the low-speed performance in direct torque control（DTC） of induction motor on system performance,we proposed a DTC fuzzy system of induction motor based on stator resistance identification and speed sensorless.In this system,the stator resistance was identified by fuzzy neural network;the motor speed was estimated by model reference adaptive system（MRAS） method based on rotor flux;and the duty cycle of pulse-width modulation（PWM） signal for DTC strategy of induction motor was adjusted by three-input single-output fuzzy controller.The three-dimensional input variables were torque error,flux magnitude error,and flux angle.That was,on the basis of the traditional DTC of induction motor,the comparator of hysteresis and the state selector of space voltage vector in the traditional DTC were replaced by the fuzzy controller.The fuzzy controller was used in the subdivisions of control rules,and was used to adjust the switching states of inverter,so as to reduce the ripple of torque and flux at low speed and improve the response speed of system torque.The simulation results show that the system can reduce torque and flux ripple,enhance robustness and adaptability of system,and improve dynamic and static qualities of the system.
