混合四电平电压源逆变器及其中点电位控制

针对传统多电平逆变器结构较复杂的缺点,提出了一种混合四电平三相三桥臂电压源逆变器的拓扑结构及其中点电位控制方法,该拓扑结构将直流侧三个分压电容的电压调整为1∶2∶1的比例,利用相与相之间的电压差来实现与传统五电平结构相同的输出线电压电平数.与传统NPC型五电平逆变器相比,该结构所需开关器件更少,具有更高的经济效益.针对...

Hybrid four-level voltage source inverter and neutral-point potential control

Aiming at the complex structure of traditional multi-level inverters,a hybrid four-level three-phase three-arm voltage source inverters and neutral-point potential control method are proposed in this paper.In this topology,this method realizes the same output line voltage level as the traditional five-level inverters by adjusting the voltage of the divided capacitor to 1:2:1 ratio in DC-side and utilizing the voltage difference between phases.Compared with the traditional NPC five-level inverters,this structure needs fewer switching devices and has higher economic efficiency.The neutral-point potential control method proposed for the topology can balance the DC-side capacitor voltage.Through MATLAB/Simulink simulation under the given conditions,the simulation results provide a certain reference for the development of medium frequency inverter power supply.