The control of NPC grid connected converter for interfacing to unbalanced DC link loads

Author

Christopher, Edward ; Sumner, Mark

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Nottingham, Nottingham, UK

fYear

2009

Firstpage

1

Lastpage

10

Abstract

A novel control scheme for neutral point clamped converters is presented, which allows interfacing of two unbalanced DC sources or loads to the AC grid. Multivariable control provides power matching for each DC link, under unbalanced DC loading conditions. Due to operation with unequal DC link capacitor voltages feedforward compensation is used to minimise the even harmonics caused in the supply current. An analytical method is derived which uses system parameters and loading to deduce the limits of control over the capacitor voltages. Experimental and simulation results are given showing the control performance.

Keywords

DC-AC power convertors; compensation; feedforward; multivariable control systems; voltage control; NPC grid connected converter; feedforward compensation; multivariable control; neutral point clamped converters; power matching; unbalanced DC link loads; Analog-digital conversion; Capacitors; Control systems; Current supplies; Feedforward systems; Photovoltaic systems; Renewable energy resources; Solar power generation; Uniform resource locators; Voltage control; Converter Control; Multilevel Converters; Photovoltaic;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Applications, 2009. EPE '09. 13th European Conference on

Conference_Location

Barcelona

Print_ISBN

978-1-4244-4432-8

Electronic_ISBN

978-90-75815-13-9

Type

conf

Filename

5279240