Control characteristics of HVDC link connected to weak ac system
The hvdc system provides an effective means to improve the stability of the ac power system and to control the power system. However, if the hvdc system is connected to a weak ac system, the voltage at the interconnecting point fluctuates very much due to the fluctuation of reactive power consumed by the ac/dc converter.The control characteristics of the hvdc system which is connected to a weak ac system were studied. A simplified model system is described and its basic equations are derived to study the static relation between dc power flow and interconnecting voltage. Then the linearized approximate dynamic equations are derived to study the effects of time constant and gain of the ac/dc converter controller on the fluctuation of interconnecting volatge. Effects of ac system parameters on the stability of the control system are also analyzed. On the basis of the above discussion, the stability of the control system is analyzed by the root locus method and the measures to improve the control system stability are proposed.
- OSTI ID:
- 7219150
- Journal Information:
- Electr. Eng. Jpn. (Engl. Transl.); (United States), Journal Name: Electr. Eng. Jpn. (Engl. Transl.); (United States) Vol. 96:5; ISSN EENJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EHV & UHV-- (-1989)
200302 -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
AC SYSTEMS
CONTROL
DC SYSTEMS
HVDC SYSTEMS
OPERATION
PERFORMANCE
POWER SYSTEMS
STABILITY
USES
VOLTAGE REGULATORS