Comparison of different frequency controllers for a VSC-HVDC supplied system
Journal article, 2008

This paper studies three different frequency controllers and their effects on the voltage disturbance ride-through capability of a VSC-HVDC supplied industrial system. The idea of implementing frequency controller is to improve the power quality of industrial plants by slightly decreasing the VSC output voltage frequency since industrial processes are more sensitive to voltage drops than frequency deviations. The first two controllers, frequency controllers I and II, are fixed frequency controllers and the third one, frequency controller III, is a PI frequency controller. In order to compare three different controllers, a system with a simplified VSC-HVDC and different load types is simulated in PSCAD/EMTDC. Simulation results show that with frequency controller III, the VSC-HVDC supplied industrial plant can avoid a voltage collapse by decreasing frequency during or after disturbances. Furthermore, with an increase of the converter current limit, the possibility of mitigating voltage dips increases. For frequency controllers I and II, the extent of the disturbance ride-through capability depends on the current limit of the VSC-UVDC. A higher current limit results in a higher ride-through capability. The effect of the dc capacitor on improving the system voltage disturbance tolerance is also investigated during and after disturbances when the VSC-HVDC uses frequency controller I. The system voltage disturbance ride-through capability increases with an increase of the dc capacitance or the current limit.

current limit

voltage disturbance

voltage sags

voltage dips

frequency controllers

voltage source converters-high-voltage direct

power

current (VSC-HVDC)

ride-through capability

loads

link

Author

[Person 6ee39bad-ed70-4315-8452-6fc3d8c1361b not found]

ABB Corporate Research Center

[Person 86138ab5-6cc7-49d5-b240-104262266410 not found]

Gothia Power AB

[Person e322002b-2d51-4226-96e8-a564b501e0ec not found]

Chalmers, Energy and Environment, Electric Power Engineering

IEEE Transactions on Power Delivery

0885-8977 (ISSN)

Vol. 23 4 2224-2232

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/tpwrd.2008.921130

More information

Created

10/6/2017