CAJ | 학술논문

针对传统的空间矢量脉宽调制SVPWM( Space Vector Pulse Width Modulation)方法计算量大且扇区判断复杂,控制器计算工作量大这一问题,研究一种基于60°坐标系和新型混合段法调制的SVPWM。该方法采用四段法与六段法结合生成所需的空间矢量调制波形,通过改变电压调整系数对P型N型O型单位矢量进行调整,进而降低电容中点电压的不平衡程度。仿真结果表明,该方法可省去扇区判断过程,协调中点电压漂移和偶次谐波消除的不足,THD缩小为31.08%。
침대전통적공간시량맥관조제SVPWM( Space Vector Pulse Width Modulation)방법계산량대차선구판단복잡,공제기계산공작량대저일문제,연구일충기우60°좌표계화신형혼합단법조제적SVPWM。해방법채용사단법여륙단법결합생성소수적공간시량조제파형,통과개변전압조정계수대P형N형O형단위시량진행조정,진이강저전용중점전압적불평형정도。방진결과표명,해방법가성거선구판단과정,협조중점전압표이화우차해파소제적불족,THD축소위31.08%。
According to the problem of the complex algorithm and the limits of the sampling period in three-level NPC ( Neutral Point Clamped) inverter by the method of traditional SVPWM( Space Vector Pulse Width Modulation) ,a new method which combined 60 ° coordinate system with new hybrid segments method was proposed. The reasonable allocation and use of four and six segments method in each sector,not only can inhibit the drift of midpoint voltage, but also reduce the output of even harmonic through the flexible use of the distribution of P-type N-type O-type unit vectors. The simulation and experiment results show that new hybrid segment SVM method makes up the shortage of traditional modulation strategy which cannot coordinate midpoint voltage drift and eliminate harmonics. Furthermore, the THD(Total Harmonic Distortion)was reduced to 31. 08%.