A new SVPWM method for single-phase three-level NPC inverter and the control method of neutral point voltage balance

Author

Zhang Zhi ; Xie Yun-xiang ; Huang Wei-ping ; Le Jiang-yuan ; Chen Lin

Author_Institution

South China Univ. of Technol., Guangzhou, China

fYear

2009

fDate

15-18 Nov. 2009

Firstpage

1

Lastpage

4

Abstract

A space vector PWM (SVPWM) algorithm is proposed for the single-phase three-level NPC inverter, and the cause of the imbalance of the capacitor voltage in DC-side is analyzed. In order to lower the switching loss and avoid the abrupt change of output voltage vectors, an optimal SVPWM algorithm is proposed, it makes use of five-vectors modulation in which the positive (or negative) small vectors are used as the first output vector. The strategy of changing the voltage adjusting coefficient to adjust the effective time of the positive and the negative small vectors to control the neutral point potential balance is proposed, which is based on the detection of the direction of the load current and the capacitor voltage. The control of DC link neutral-point potential is easy to implement. The validity of the new SVPWM method is verified by simulation and experiment with a three-level MOSFET inverter.

Keywords

MOSFET; MOSFET circuits; PWM invertors; power system control; DC link neutral-point potential; capacitor voltage; five-vectors modulation; neutral point voltage balance; output voltage vectors; single-phase three-level neutral point clamped inverter; space vector PWM algorithm; switching loss; three-level MOSFET inverter; voltage adjusting coefficient; Capacitors; Leg; Phase modulation; Pulse width modulation inverters; Space technology; Space vector pulse width modulation; Switches; Switching converters; Topology; Voltage control; SVPWM; Single-phase three-level; capacitor voltage balance; redundant vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Machines and Systems, 2009. ICEMS 2009. International Conference on

Conference_Location

Tokyo

Print_ISBN

978-1-4244-5177-7

Electronic_ISBN

978-4-88686-067-5

Type

conf

DOI

10.1109/ICEMS.2009.5382854

Filename

5382854