Title :
A neutral-point potential balancing algorithm for three-level NPC inverters using analytically injected zero-sequence voltage
Author :
Song, Qiang ; Liu, Wenhua ; Yu, Qingguang ; Xie, Xiaorong ; Wang, Zhonghong
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
Abstract :
Based on the zero-sequence component of the reference voltages, this paper comprehensively analyzes the neutral-point variation and balancing control for three-level neutral-point-clamped inverter. An analytical method is proposed to accurately calculate the injected zero-sequence voltage for NP balancing. Based on the analytical analysis, the limitation of NP balancing control is revealed and the NP-fully-controllable region is presented. A real-time NP balancing algorithm is proposed as well. The feasibility of the proposed method is verified using simulation results for a 6 kV/1800 kVA medium voltage drive.
Keywords :
AC motor drives; PWM invertors; voltage control; 1800 kVA; 6 kV; analytically injected zero-sequence voltage; balancing control; neutral-point potential balancing algorithm; reference voltages; three-level NPC inverters; three-level neutral-point-clamped inverter; zero-sequence component; Algorithm design and analysis; Capacitors; Medium voltage; Power measurement; Pulse width modulation; Pulse width modulation inverters; Reactive power; Support vector machines; Topology; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2003. APEC '03. Eighteenth Annual IEEE
Conference_Location :
Miami Beach, FL, USA
Print_ISBN :
0-7803-7768-0
DOI :
10.1109/APEC.2003.1179220
