A new type of STATCOM based on cascading voltage source inverters with phase-shifted unipolar SPWM

Author

Liang, Yiqiao ; Nwankpa, C.O.

Author_Institution

CEGELEC Autom., Pittsburgh, PA, USA

Volume

2

fYear

1998

fDate

12-15 Oct. 1998

Firstpage

1447

Abstract

In this paper, a new type of STATCOM is proposed. This new STATCOM is constructed by cascading several identical full bridge (H bridge) voltage source inverters (VSI). A so called phase-shifted SPWM unipolar voltage switching scheme is applied to control the switching devices of each VSI. The harmonics in STATCOM current caused by the DC voltage ripple are rejected by a new method developed in this paper. As a result, the size of inductor and DC capacitors can be further reduced. A very effective startup procedure is proposed to start up the STATCOM. The proposed STATCOM has the advantages of a reduced number of VSIs; the VSIs being identical and extremely fast in response to reactive power change.

Keywords

DC-AC power convertors; PWM invertors; bridge circuits; harmonic distortion; power conversion harmonics; static VAr compensators; thyristor convertors; DC capacitors; DC voltage ripple; H-bridge VSI; STATCOM; cascading voltage source inverters; full-bridge VSI; inductor; phase-shifted unipolar SPWM; power convertor current harmonics; reactive power change response speed; startup procedure; switching devices control; unipolar voltage switching scheme; Automatic voltage control; Bridge circuits; Capacitors; Diodes; Inductors; Inverters; Reactive power; Switches; Switching circuits; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1998. Thirty-Third IAS Annual Meeting. The 1998 IEEE

Conference_Location

St. Louis, MO, USA

ISSN

0197-2618

Print_ISBN

0-7803-4943-1

Type

conf

DOI

10.1109/IAS.1998.730333

Filename

730333