Vector current controlled grid connected voltage source converter-influence of nonlinearities on the performance

Author

Svensson, Jan ; Lindgren, Michael

Author_Institution

Dept. of Electr. Power Eng., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

1

fYear

1998

fDate

17-22 May 1998

Firstpage

531

Abstract

In the literature, the influence of nonlinearities occurring due to the effects of blanking time, the valves and the nonideal grid filter on the dynamic performance of current control are usually not described. In this paper, small-signal analysis is used to study the influence of nonlinearities for a vector current controlled VSC connected to a grid. To show the influence of nonlinearities, measured frequency responses are compared with responses from analytical models. Measured responses are presented for operation in rectifier and inverter operation as well as static VAr operation. As displayed, the frequency dependent losses in the grid filter affect the dynamic performance at high frequencies. A method for compensating for nonlinearities due to blanking-time and nonideal valves is implemented. The compensation method improves the performance

Keywords

electric current control; frequency response; invertors; losses; power convertors; rectifying circuits; static VAr compensators; blanking time; compensation method; dynamic performance; frequency dependent losses; frequency responses; grid connected voltage source converter; inverter operation; nonideal grid filter; nonlinearities; rectifier operation; small-signal analysis; static VAr operation; valves; vector current control; Analytical models; Blanking; Control nonlinearities; Current control; Filters; Frequency measurement; Inverters; Rectifiers; Valves; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE

Conference_Location

Fukuoka

ISSN

0275-9306

Print_ISBN

0-7803-4489-8

Type

conf

DOI

10.1109/PESC.1998.701949

Filename

701949