A novel method for improving the fault tolerance of transformerless cascade PWM STATCOM

Author

Zhu, Ming-lei ; Zhao, Rong-xiang ; Zhang, Hao ; Du, Yi

Author_Institution

Electr. Eng. Coll., Zhejiang Univ., Hangzhou

fYear

2008

fDate

17-20 Oct. 2008

Firstpage

1990

Lastpage

1994

Abstract

A novel control method is presented for improving the reliability of transformerless cascade STATCOMs operating under various faults. A modified H bridge circuit is proposed, and it could be totally bypassed under various faults while the STATCOM keep working. During the fault transient, by controlling the phase of a STATCOMpsilas output voltage, the DC capacitors could be charged or discharged to maintain the STATCOMpsilas capability of outputting reactive power. The simulation results about the performances of the proposed method and circuit are given.

Keywords

fault tolerance; reactive power control; reliability; static VAr compensators; fault tolerance; modified H bridge circuit; power reliability; reactive power; static synchronous compensator; transformerless cascade PWM STATCOM; Automatic voltage control; Capacitors; Circuit faults; Fault tolerance; Flexible AC transmission systems; Medium voltage; Pulse width modulation; Pulse width modulation inverters; Reactive power control; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Machines and Systems, 2008. ICEMS 2008. International Conference on

Conference_Location

Wuhan

Print_ISBN

978-1-4244-3826-6

Electronic_ISBN

978-7-5062-9221-4

Type

conf

Filename

4771068