Title :
Research on neutral-point potential balancing for three-level NPC voltage source inverter
Author :
Hu, Cungang ; Wang, Qunjing ; Li, Guoli
Author_Institution :
Sch. of Electr. & Autom. Eng., Hefei Univ. of Technol., Hefei
Abstract :
A significant problem with neutral-point-clamped three-level inverters is the fluctuation in the neutral-point voltage. When three-level inverter is loaded, the neutral-point voltage leads to the distortion on output voltage space-vector waveform of the inverter. A novel and simple judge rule based on the virtual space-vector is introduced. The mathematics models of neutral-point circuit and neutral-point potential are developed while the neutral-point potential is unbalanced. And the region of neutral-point potential can be balanced in a sample period is described.
Keywords :
PWM invertors; vectors; SVPWM; neutral-point potential balancing model; neutral-point-clamped three-level inverters; space vector pulse width modulation invertor; three-level NPC; virtual space-vector rule; voltage source inverter; Automation; Educational technology; Fluctuations; Inverters; Mathematical model; Photovoltaic systems; Space vector pulse width modulation; Systems engineering and theory; Topology; Voltage;
Conference_Titel :
Electrical Machines and Systems, 2008. ICEMS 2008. International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-3826-6
Electronic_ISBN :
978-7-5062-9221-4
