Stability and control of HVDC and AC transmissions in parallel

Author

Hammad, A.E.

Author_Institution

NE Swiss Power Co., Baden, Switzerland

Volume

14

Issue

4

fYear

1999

fDate

10/1/1999 12:00:00 AM

Firstpage

1545

Lastpage

1554

Abstract

A generic concept combining transient angle and voltage stabilities of parallel AC/DC transmission is introduced. It proves that HVDC schemes in parallel operation with AC transmission are prone to both transient swing angle and voltage instabilities. This tendency is intensified as the parallel AC interconnection becomes stronger. The concept also explains why an HVDC scheme fitted with classical DC power controls does not contribute to system synchronizing torque and may increase the risks for instability. The concept offers a solid means to develop robust strategies to control the dynamic operation of DC and AC transmissions in parallel. With such strategies, the HVDC scheme can positively participate in the instantaneous rescheduling of power according to arising network conditions, particularly during disturbance conditions

Keywords

HVDC power transmission; power system dynamic stability; power system interconnection; power system transient stability; power transmission control; robust control; AC transmission; HVDC transmission; disturbance conditions; dynamic operation control; instantaneous power rescheduling; network conditions; parallel AC/DC transmission; robust strategies; transient stability; transient swing angle instability; voltage instability; voltage stability; Damping; HVDC transmission; Power generation economics; Power system economics; Robust control; Solids; Stability; Torque; Transportation; Voltage control;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.796252

Filename

796252