NPC逆变器SHE-PWM开关角度的计算方法研究  

A METHOD OF SOLUTION TO SELECTIVE HARMONIC ELIMINATED PWM SWITCHING ANGLES FOR NPC INVERTERS

作　　者：刘文华[1] 宋强[1] 陈远华[1] 谢小荣[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《中国电机工程学报》2002年第11期31-34,共4页Proceedings of the CSEE

摘　　要：以应用于高压变频调速装置中的三电平中点嵌位(Neutral Point Clamped)逆变器为研究对象,对特定消谐技术(Selected Harmonic Elimination PWM)的应用进行了分析与研究;针对用数值方法求解SHE-PWM开关角度时非线性方程组计算初值选择困难的情况,给出了采用解轨迹微分预估初值的计算方法,并总结了调制比m 0时的开关角度解初值公式;实际计算结果表明:该文提出的方法在数值计算中可以得到快速收敛和准确的结果,并通过计算结果分析了SHE-PWM技术应用于NPC逆变器时所能达到的最大调制比,且其计算结果得到实验验证。This paper analyzes the selected harmonic eliminated PWM technique for three-level NPC Inverter-Fed AC Drives. For the difficulty of determining the initial values when solving the SHE-PWM nonlinear equations, this paper proposes a method that using the differentiation of tbe solutions to predict the initial values. The initial values equations when the modulation index m is equal to zero are also given. The calculation results proved that numerical algorithm using this initial value method will convergent to the desired solutions fast.Through the calculation results, the maxim modulation index of the SHE-PWM for the NPC inverter is analyzed. The calculation results are confirmed by test results.

关 键 词：NPC逆变器 SHE-PWM 开关角度 计算方法 特定消谐技术 三电平逆变器 变频调速 

分 类 号：TM464[电气工程—电器]