Calculation of valve damping circuit losses in 12-pulse HVDC convertors

Author

Tennakoon, Sarath B. ; Woodhouse, Michael L.

Author_Institution

Staffordshire Polytech., Stoke-on-Trent, UK

Volume

7

Issue

2

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

1002

Lastpage

1008

Abstract

An analytical method is presented for the calculation of valve damping circuit losses of a 12-pulse HVDC convertor, taking the effects of inductive coupling into account. The extra commutation notches introduced to the valve voltage waveform are expressed in terms of a notch factor, and a general equation for the valve damping circuit loss is derived. The equation is divided into two parts so that the effects of valve stray capacitance and multiple valve grading circuits can be accommodated in a logical manner. An additional component of loss arising from the thyristor stored change phenomenon is also discussed

Keywords

DC power transmission; equivalent circuits; losses; power convertors; power transformers; thyristor applications; DC power transmission; HVDC; commutation notches; equivalent circuits; inductive coupling; multiple valve grading circuits; notch factor; power convertors; stray capacitance; thyristor; transformers; valve damping circuit losses; Converters; Coupling circuits; Damping; Equations; HVDC transmission; Inductance; Phase transformers; Thyristors; Valves; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.127110

Filename

127110