单周控制的三级逆变器研究  

A Study on Three-Level Inverter under One-Cycle Control

作　　者：陈贤明[1] 吕宏水[1] 刘国华[1] 

机构地区：[1]国网电力科学研究院,江苏南京210003

出　　处：《变频技术应用》2012年第3期26-31,共6页INVERTER TECHNOLOGIES AND APPLICATIONS

摘　　要：本文探讨了用单周控制并网的三相中性点箝位三级逆变器，提出了控制的新方法。每一瞬刻，只需对三只全控型电力电子开关元件作PWM控制，减少了元件的开关损耗，此外，它利用单周控制来实现SPWM，其电路简单，动态性能好。利用这种方法对三相三级PWM并网逆变器电路进行了Matlab／Simulink建模和仿真，得出了输出正弦电流和功率因数接近1的予期结果，证明在原理上是可行的，宜进一步试验验证。A three-phase three-level inverter with neutral point clamped connected to power grid under one-cycle control （OCC） is explored and a new control method is proposed. Only three fully-controlled power electronic switch devices need to act for PWM control at any instant so as to reduce switching loss. In addition, implementation of sine pulse-width modulation （SPWM） with one cycle control causes simpler electric circuit and better dynamic performance. The modeling and simulation for three-phase three-level PWM inverter under one-cycle control is completed with Matlab/Simulink software. The simulation results show that power factor near 1 and three phase sinusoidal currents can be obtained. It verifies that principle of the method is feasible and worthwhile confirmation further in experiment.

关 键 词：三相三级逆变器 PWM 单周控制 MATLAB/SIMULINK仿真 

分 类 号：TM46[电气工程—电器]