Neutral point voltage-balanced control method based on discontinuous pulse width modulation for a NPC 3-level inverter

Author

Shaoliang An ; Lu Lai ; Xiangdong Sun ; Zhong, Yanru ; Biying Ren ; Qi Zhang

Author_Institution

Electr. Eng. Dept., Xi´an Univ. of Technol., Xi´an, China

fYear

2015

fDate

1-5 June 2015

Firstpage

2820

Lastpage

2825

Abstract

A neutral point voltage-balancing control algorithm is proposed for a neutral-point-clamped (NPC) three-level photovoltaic (PV) grid-connected inverter. The mathematical model of the neutral point current was deduced. The influence on the neutral point voltage for discontinuous pulse width modulation(DPWM) methods was analyzed. Comparison of the error between feedback neutral point voltages and the hysteresis width was used to choose a DPWM method to control the neutral point voltage. Simulation and experimental results verify the correctness and validity of the proposed neutral point voltage-balancing control algorithm.

Keywords

PWM invertors; photovoltaic power systems; power grids; voltage control; DPWM methods; NPC 3-level inverter; discontinuous pulse width modulation methods; feedback neutral point voltages; neutral point voltage-balanced control method; neutral-point-clamped three-level photovoltaic grid-connected inverter; Fluctuations; Frequency modulation; Inverters; Mathematical model; Space vector pulse width modulation; Voltage control; Grid-connected inverter; neutral point voltage-balanced control; three-level; two-phase modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015 9th International Conference on

Conference_Location

Seoul

Type

conf

DOI

10.1109/ICPE.2015.7168171

Filename

7168171