CAJ | 학술논문

异步电机软启动过程中定子电压和定子电流发生畸变,影响电机的启动性能且产生谐波污染。基于瞬时功率理论,以三相异步电机为研究对象,通过动态方程获得了功率因数函数的数学模型,给出了电压电流和功率的仿真曲线,获得了新的软启动控制律。仿真结果表明,电机启动的不同阶段,新控制律能提高有用功的传递,从而验证了该控制律的有效性。
이보전궤연계동과정중정자전압화정자전류발생기변,영향전궤적계동성능차산생해파오염。기우순시공솔이론,이삼상이보전궤위연구대상,통과동태방정획득료공솔인수함수적수학모형,급출료전압전류화공솔적방진곡선,획득료신적연계동공제률。방진결과표명,전궤계동적불동계단,신공제률능제고유용공적전체,종이험증료해공제률적유효성。
Aimed at improving the poor start performance and eliminating harmonics pollution to the grid due to the waveform distortion of stator voltage and stator current often occurring during the course of asynchronous machine start,this paper describes the developement of the mathematical model of power factor,based on instantaneous power theory,using 3-phase asynchronous machines for object and according to dynamic equations and optimization of the function of power factor,proposes new control method grounded on the optimal results and provides simulation curves of stator voltage,stator current and real power.The simulation indicates that on different stages of start,new method is able to improve real power,which validates the control method based on instantaneous power theory.